drivers/net/wireless/iwlegacy/common.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <linux/types.h>
  35 #include <linux/lockdep.h>
  36 #include <linux/init.h>
  37 #include <linux/pci.h>
  38 #include <linux/dma-mapping.h>
  39 #include <linux/delay.h>
  40 #include <linux/skbuff.h>
  41 #include <net/mac80211.h>
  42
  43 #include "common.h"
  44
  45 int
  46 _il_poll_bit(struct il_priv *il, u32 addr, u32 bits, u32 mask, int timeout)
  47 {
  48         const int interval = 10; /* microseconds */
  49         int t = 0;
  50
  51         do {
  52                 if ((_il_rd(il, addr) & mask) == (bits & mask))
  53                         return t;
  54                 udelay(interval);
  55                 t += interval;
  56         } while (t < timeout);
  57
  58         return -ETIMEDOUT;
  59 }
  60 EXPORT_SYMBOL(_il_poll_bit);
  61
  62 void
  63 il_set_bit(struct il_priv *p, u32 r, u32 m)
  64 {
  65         unsigned long reg_flags;
  66
  67         spin_lock_irqsave(&p->reg_lock, reg_flags);
  68         _il_set_bit(p, r, m);
  69         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
  70 }
  71 EXPORT_SYMBOL(il_set_bit);
  72
  73 void
  74 il_clear_bit(struct il_priv *p, u32 r, u32 m)
  75 {
  76         unsigned long reg_flags;
  77
  78         spin_lock_irqsave(&p->reg_lock, reg_flags);
  79         _il_clear_bit(p, r, m);
  80         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
  81 }
  82 EXPORT_SYMBOL(il_clear_bit);
  83
  84 bool
  85 _il_grab_nic_access(struct il_priv *il)
  86 {
  87         int ret;
  88         u32 val;
  89
  90         /* this bit wakes up the NIC */
  91         _il_set_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
  92
  93         /*
  94          * These bits say the device is running, and should keep running for
  95          * at least a short while (at least as long as MAC_ACCESS_REQ stays 1),
  96          * but they do not indicate that embedded SRAM is restored yet;
  97          * 3945 and 4965 have volatile SRAM, and must save/restore contents
  98          * to/from host DRAM when sleeping/waking for power-saving.
  99          * Each direction takes approximately 1/4 millisecond; with this
 100          * overhead, it's a good idea to grab and hold MAC_ACCESS_REQUEST if a
 101          * series of register accesses are expected (e.g. reading Event Log),
 102          * to keep device from sleeping.
 103          *
 104          * CSR_UCODE_DRV_GP1 register bit MAC_SLEEP == 0 indicates that
 105          * SRAM is okay/restored.  We don't check that here because this call
 106          * is just for hardware register access; but GP1 MAC_SLEEP check is a
 107          * good idea before accessing 3945/4965 SRAM (e.g. reading Event Log).
 108          *
 109          */
 110         ret =
 111             _il_poll_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
 112                          (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
 113                           CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
 114         if (unlikely(ret < 0)) {
 115                 val = _il_rd(il, CSR_GP_CNTRL);
 116                 WARN_ONCE(1, "Timeout waiting for ucode processor access "
 117                              "(CSR_GP_CNTRL 0x%08x)\n", val);
 118                 _il_wr(il, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
 119                 return false;
 120         }
 121
 122         return true;
 123 }
 124 EXPORT_SYMBOL_GPL(_il_grab_nic_access);
 125
 126 int
 127 il_poll_bit(struct il_priv *il, u32 addr, u32 mask, int timeout)
 128 {
 129         const int interval = 10; /* microseconds */
 130         int t = 0;
 131
 132         do {
 133                 if ((il_rd(il, addr) & mask) == mask)
 134                         return t;
 135                 udelay(interval);
 136                 t += interval;
 137         } while (t < timeout);
 138
 139         return -ETIMEDOUT;
 140 }
 141 EXPORT_SYMBOL(il_poll_bit);
 142
 143 u32
 144 il_rd_prph(struct il_priv *il, u32 reg)
 145 {
 146         unsigned long reg_flags;
 147         u32 val;
 148
 149         spin_lock_irqsave(&il->reg_lock, reg_flags);
 150         _il_grab_nic_access(il);
 151         val = _il_rd_prph(il, reg);
 152         _il_release_nic_access(il);
 153         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 154         return val;
 155 }
 156 EXPORT_SYMBOL(il_rd_prph);
 157
 158 void
 159 il_wr_prph(struct il_priv *il, u32 addr, u32 val)
 160 {
 161         unsigned long reg_flags;
 162
 163         spin_lock_irqsave(&il->reg_lock, reg_flags);
 164         if (likely(_il_grab_nic_access(il))) {
 165                 _il_wr_prph(il, addr, val);
 166                 _il_release_nic_access(il);
 167         }
 168         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 169 }
 170 EXPORT_SYMBOL(il_wr_prph);
 171
 172 u32
 173 il_read_targ_mem(struct il_priv *il, u32 addr)
 174 {
 175         unsigned long reg_flags;
 176         u32 value;
 177
 178         spin_lock_irqsave(&il->reg_lock, reg_flags);
 179         _il_grab_nic_access(il);
 180
 181         _il_wr(il, HBUS_TARG_MEM_RADDR, addr);
 182         value = _il_rd(il, HBUS_TARG_MEM_RDAT);
 183
 184         _il_release_nic_access(il);
 185         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 186         return value;
 187 }
 188 EXPORT_SYMBOL(il_read_targ_mem);
 189
 190 void
 191 il_write_targ_mem(struct il_priv *il, u32 addr, u32 val)
 192 {
 193         unsigned long reg_flags;
 194
 195         spin_lock_irqsave(&il->reg_lock, reg_flags);
 196         if (likely(_il_grab_nic_access(il))) {
 197                 _il_wr(il, HBUS_TARG_MEM_WADDR, addr);
 198                 _il_wr(il, HBUS_TARG_MEM_WDAT, val);
 199                 _il_release_nic_access(il);
 200         }
 201         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 202 }
 203 EXPORT_SYMBOL(il_write_targ_mem);
 204
 205 const char *
 206 il_get_cmd_string(u8 cmd)
 207 {
 208         switch (cmd) {
 209                 IL_CMD(N_ALIVE);
 210                 IL_CMD(N_ERROR);
 211                 IL_CMD(C_RXON);
 212                 IL_CMD(C_RXON_ASSOC);
 213                 IL_CMD(C_QOS_PARAM);
 214                 IL_CMD(C_RXON_TIMING);
 215                 IL_CMD(C_ADD_STA);
 216                 IL_CMD(C_REM_STA);
 217                 IL_CMD(C_WEPKEY);
 218                 IL_CMD(N_3945_RX);
 219                 IL_CMD(C_TX);
 220                 IL_CMD(C_RATE_SCALE);
 221                 IL_CMD(C_LEDS);
 222                 IL_CMD(C_TX_LINK_QUALITY_CMD);
 223                 IL_CMD(C_CHANNEL_SWITCH);
 224                 IL_CMD(N_CHANNEL_SWITCH);
 225                 IL_CMD(C_SPECTRUM_MEASUREMENT);
 226                 IL_CMD(N_SPECTRUM_MEASUREMENT);
 227                 IL_CMD(C_POWER_TBL);
 228                 IL_CMD(N_PM_SLEEP);
 229                 IL_CMD(N_PM_DEBUG_STATS);
 230                 IL_CMD(C_SCAN);
 231                 IL_CMD(C_SCAN_ABORT);
 232                 IL_CMD(N_SCAN_START);
 233                 IL_CMD(N_SCAN_RESULTS);
 234                 IL_CMD(N_SCAN_COMPLETE);
 235                 IL_CMD(N_BEACON);
 236                 IL_CMD(C_TX_BEACON);
 237                 IL_CMD(C_TX_PWR_TBL);
 238                 IL_CMD(C_BT_CONFIG);
 239                 IL_CMD(C_STATS);
 240                 IL_CMD(N_STATS);
 241                 IL_CMD(N_CARD_STATE);
 242                 IL_CMD(N_MISSED_BEACONS);
 243                 IL_CMD(C_CT_KILL_CONFIG);
 244                 IL_CMD(C_SENSITIVITY);
 245                 IL_CMD(C_PHY_CALIBRATION);
 246                 IL_CMD(N_RX_PHY);
 247                 IL_CMD(N_RX_MPDU);
 248                 IL_CMD(N_RX);
 249                 IL_CMD(N_COMPRESSED_BA);
 250         default:
 251                 return "UNKNOWN";
 252
 253         }
 254 }
 255 EXPORT_SYMBOL(il_get_cmd_string);
 256
 257 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
 258
 259 static void
 260 il_generic_cmd_callback(struct il_priv *il, struct il_device_cmd *cmd,
 261                         struct il_rx_pkt *pkt)
 262 {
 263         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
 264                 IL_ERR("Bad return from %s (0x%08X)\n",
 265                        il_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 266                 return;
 267         }
 268 #ifdef CONFIG_IWLEGACY_DEBUG
 269         switch (cmd->hdr.cmd) {
 270         case C_TX_LINK_QUALITY_CMD:
 271         case C_SENSITIVITY:
 272                 D_HC_DUMP("back from %s (0x%08X)\n",
 273                           il_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 274                 break;
 275         default:
 276                 D_HC("back from %s (0x%08X)\n", il_get_cmd_string(cmd->hdr.cmd),
 277                      pkt->hdr.flags);
 278         }
 279 #endif
 280 }
 281
 282 static int
 283 il_send_cmd_async(struct il_priv *il, struct il_host_cmd *cmd)
 284 {
 285         int ret;
 286
 287         BUG_ON(!(cmd->flags & CMD_ASYNC));
 288
 289         /* An asynchronous command can not expect an SKB to be set. */
 290         BUG_ON(cmd->flags & CMD_WANT_SKB);
 291
 292         /* Assign a generic callback if one is not provided */
 293         if (!cmd->callback)
 294                 cmd->callback = il_generic_cmd_callback;
 295
 296         if (test_bit(S_EXIT_PENDING, &il->status))
 297                 return -EBUSY;
 298
 299         ret = il_enqueue_hcmd(il, cmd);
 300         if (ret < 0) {
 301                 IL_ERR("Error sending %s: enqueue_hcmd failed: %d\n",
 302                        il_get_cmd_string(cmd->id), ret);
 303                 return ret;
 304         }
 305         return 0;
 306 }
 307
 308 int
 309 il_send_cmd_sync(struct il_priv *il, struct il_host_cmd *cmd)
 310 {
 311         int cmd_idx;
 312         int ret;
 313
 314         lockdep_assert_held(&il->mutex);
 315
 316         BUG_ON(cmd->flags & CMD_ASYNC);
 317
 318         /* A synchronous command can not have a callback set. */
 319         BUG_ON(cmd->callback);
 320
 321         D_INFO("Attempting to send sync command %s\n",
 322                il_get_cmd_string(cmd->id));
 323
 324         set_bit(S_HCMD_ACTIVE, &il->status);
 325         D_INFO("Setting HCMD_ACTIVE for command %s\n",
 326                il_get_cmd_string(cmd->id));
 327
 328         cmd_idx = il_enqueue_hcmd(il, cmd);
 329         if (cmd_idx < 0) {
 330                 ret = cmd_idx;
 331                 IL_ERR("Error sending %s: enqueue_hcmd failed: %d\n",
 332                        il_get_cmd_string(cmd->id), ret);
 333                 goto out;
 334         }
 335
 336         ret = wait_event_timeout(il->wait_command_queue,
 337                                  !test_bit(S_HCMD_ACTIVE, &il->status),
 338                                  HOST_COMPLETE_TIMEOUT);
 339         if (!ret) {
 340                 if (test_bit(S_HCMD_ACTIVE, &il->status)) {
 341                         IL_ERR("Error sending %s: time out after %dms.\n",
 342                                il_get_cmd_string(cmd->id),
 343                                jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 344
 345                         clear_bit(S_HCMD_ACTIVE, &il->status);
 346                         D_INFO("Clearing HCMD_ACTIVE for command %s\n",
 347                                il_get_cmd_string(cmd->id));
 348                         ret = -ETIMEDOUT;
 349                         goto cancel;
 350                 }
 351         }
 352
 353         if (test_bit(S_RFKILL, &il->status)) {
 354                 IL_ERR("Command %s aborted: RF KILL Switch\n",
 355                        il_get_cmd_string(cmd->id));
 356                 ret = -ECANCELED;
 357                 goto fail;
 358         }
 359         if (test_bit(S_FW_ERROR, &il->status)) {
 360                 IL_ERR("Command %s failed: FW Error\n",
 361                        il_get_cmd_string(cmd->id));
 362                 ret = -EIO;
 363                 goto fail;
 364         }
 365         if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
 366                 IL_ERR("Error: Response NULL in '%s'\n",
 367                        il_get_cmd_string(cmd->id));
 368                 ret = -EIO;
 369                 goto cancel;
 370         }
 371
 372         ret = 0;
 373         goto out;
 374
 375 cancel:
 376         if (cmd->flags & CMD_WANT_SKB) {
 377                 /*
 378                  * Cancel the CMD_WANT_SKB flag for the cmd in the
 379                  * TX cmd queue. Otherwise in case the cmd comes
 380                  * in later, it will possibly set an invalid
 381                  * address (cmd->meta.source).
 382                  */
 383                 il->txq[il->cmd_queue].meta[cmd_idx].flags &= ~CMD_WANT_SKB;
 384         }
 385 fail:
 386         if (cmd->reply_page) {
 387                 il_free_pages(il, cmd->reply_page);
 388                 cmd->reply_page = 0;
 389         }
 390 out:
 391         return ret;
 392 }
 393 EXPORT_SYMBOL(il_send_cmd_sync);
 394
 395 int
 396 il_send_cmd(struct il_priv *il, struct il_host_cmd *cmd)
 397 {
 398         if (cmd->flags & CMD_ASYNC)
 399                 return il_send_cmd_async(il, cmd);
 400
 401         return il_send_cmd_sync(il, cmd);
 402 }
 403 EXPORT_SYMBOL(il_send_cmd);
 404
 405 int
 406 il_send_cmd_pdu(struct il_priv *il, u8 id, u16 len, const void *data)
 407 {
 408         struct il_host_cmd cmd = {
 409                 .id = id,
 410                 .len = len,
 411                 .data = data,
 412         };
 413
 414         return il_send_cmd_sync(il, &cmd);
 415 }
 416 EXPORT_SYMBOL(il_send_cmd_pdu);
 417
 418 int
 419 il_send_cmd_pdu_async(struct il_priv *il, u8 id, u16 len, const void *data,
 420                       void (*callback) (struct il_priv *il,
 421                                         struct il_device_cmd *cmd,
 422                                         struct il_rx_pkt *pkt))
 423 {
 424         struct il_host_cmd cmd = {
 425                 .id = id,
 426                 .len = len,
 427                 .data = data,
 428         };
 429
 430         cmd.flags |= CMD_ASYNC;
 431         cmd.callback = callback;
 432
 433         return il_send_cmd_async(il, &cmd);
 434 }
 435 EXPORT_SYMBOL(il_send_cmd_pdu_async);
 436
 437 /* default: IL_LED_BLINK(0) using blinking idx table */
 438 static int led_mode;
 439 module_param(led_mode, int, S_IRUGO);
 440 MODULE_PARM_DESC(led_mode,
 441                  "0=system default, " "1=On(RF On)/Off(RF Off), 2=blinking");
 442
 443 /* Throughput           OFF time(ms)    ON time (ms)
 444  *      >300                    25              25
 445  *      >200 to 300             40              40
 446  *      >100 to 200             55              55
 447  *      >70 to 100              65              65
 448  *      >50 to 70               75              75
 449  *      >20 to 50               85              85
 450  *      >10 to 20               95              95
 451  *      >5 to 10                110             110
 452  *      >1 to 5                 130             130
 453  *      >0 to 1                 167             167
 454  *      <=0                                     SOLID ON
 455  */
 456 static const struct ieee80211_tpt_blink il_blink[] = {
 457         {.throughput = 0,               .blink_time = 334},
 458         {.throughput = 1 * 1024 - 1,    .blink_time = 260},
 459         {.throughput = 5 * 1024 - 1,    .blink_time = 220},
 460         {.throughput = 10 * 1024 - 1,   .blink_time = 190},
 461         {.throughput = 20 * 1024 - 1,   .blink_time = 170},
 462         {.throughput = 50 * 1024 - 1,   .blink_time = 150},
 463         {.throughput = 70 * 1024 - 1,   .blink_time = 130},
 464         {.throughput = 100 * 1024 - 1,  .blink_time = 110},
 465         {.throughput = 200 * 1024 - 1,  .blink_time = 80},
 466         {.throughput = 300 * 1024 - 1,  .blink_time = 50},
 467 };
 468
 469 /*
 470  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
 471  * Led blink rate analysis showed an average deviation of 0% on 3945,
 472  * 5% on 4965 HW.
 473  * Need to compensate on the led on/off time per HW according to the deviation
 474  * to achieve the desired led frequency
 475  * The calculation is: (100-averageDeviation)/100 * blinkTime
 476  * For code efficiency the calculation will be:
 477  *     compensation = (100 - averageDeviation) * 64 / 100
 478  *     NewBlinkTime = (compensation * BlinkTime) / 64
 479  */
 480 static inline u8
 481 il_blink_compensation(struct il_priv *il, u8 time, u16 compensation)
 482 {
 483         if (!compensation) {
 484                 IL_ERR("undefined blink compensation: "
 485                        "use pre-defined blinking time\n");
 486                 return time;
 487         }
 488
 489         return (u8) ((time * compensation) >> 6);
 490 }
 491
 492 /* Set led pattern command */
 493 static int
 494 il_led_cmd(struct il_priv *il, unsigned long on, unsigned long off)
 495 {
 496         struct il_led_cmd led_cmd = {
 497                 .id = IL_LED_LINK,
 498                 .interval = IL_DEF_LED_INTRVL
 499         };
 500         int ret;
 501
 502         if (!test_bit(S_READY, &il->status))
 503                 return -EBUSY;
 504
 505         if (il->blink_on == on && il->blink_off == off)
 506                 return 0;
 507
 508         if (off == 0) {
 509                 /* led is SOLID_ON */
 510                 on = IL_LED_SOLID;
 511         }
 512
 513         D_LED("Led blink time compensation=%u\n",
 514               il->cfg->led_compensation);
 515         led_cmd.on =
 516             il_blink_compensation(il, on,
 517                                   il->cfg->led_compensation);
 518         led_cmd.off =
 519             il_blink_compensation(il, off,
 520                                   il->cfg->led_compensation);
 521
 522         ret = il->ops->send_led_cmd(il, &led_cmd);
 523         if (!ret) {
 524                 il->blink_on = on;
 525                 il->blink_off = off;
 526         }
 527         return ret;
 528 }
 529
 530 static void
 531 il_led_brightness_set(struct led_classdev *led_cdev,
 532                       enum led_brightness brightness)
 533 {
 534         struct il_priv *il = container_of(led_cdev, struct il_priv, led);
 535         unsigned long on = 0;
 536
 537         if (brightness > 0)
 538                 on = IL_LED_SOLID;
 539
 540         il_led_cmd(il, on, 0);
 541 }
 542
 543 static int
 544 il_led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
 545                  unsigned long *delay_off)
 546 {
 547         struct il_priv *il = container_of(led_cdev, struct il_priv, led);
 548
 549         return il_led_cmd(il, *delay_on, *delay_off);
 550 }
 551
 552 void
 553 il_leds_init(struct il_priv *il)
 554 {
 555         int mode = led_mode;
 556         int ret;
 557
 558         if (mode == IL_LED_DEFAULT)
 559                 mode = il->cfg->led_mode;
 560
 561         il->led.name =
 562             kasprintf(GFP_KERNEL, "%s-led", wiphy_name(il->hw->wiphy));
 563         il->led.brightness_set = il_led_brightness_set;
 564         il->led.blink_set = il_led_blink_set;
 565         il->led.max_brightness = 1;
 566
 567         switch (mode) {
 568         case IL_LED_DEFAULT:
 569                 WARN_ON(1);
 570                 break;
 571         case IL_LED_BLINK:
 572                 il->led.default_trigger =
 573                     ieee80211_create_tpt_led_trigger(il->hw,
 574                                                      IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
 575                                                      il_blink,
 576                                                      ARRAY_SIZE(il_blink));
 577                 break;
 578         case IL_LED_RF_STATE:
 579                 il->led.default_trigger = ieee80211_get_radio_led_name(il->hw);
 580                 break;
 581         }
 582
 583         ret = led_classdev_register(&il->pci_dev->dev, &il->led);
 584         if (ret) {
 585                 kfree(il->led.name);
 586                 return;
 587         }
 588
 589         il->led_registered = true;
 590 }
 591 EXPORT_SYMBOL(il_leds_init);
 592
 593 void
 594 il_leds_exit(struct il_priv *il)
 595 {
 596         if (!il->led_registered)
 597                 return;
 598
 599         led_classdev_unregister(&il->led);
 600         kfree(il->led.name);
 601 }
 602 EXPORT_SYMBOL(il_leds_exit);
 603
 604 /************************** EEPROM BANDS ****************************
 605  *
 606  * The il_eeprom_band definitions below provide the mapping from the
 607  * EEPROM contents to the specific channel number supported for each
 608  * band.
 609  *
 610  * For example, il_priv->eeprom.band_3_channels[4] from the band_3
 611  * definition below maps to physical channel 42 in the 5.2GHz spectrum.
 612  * The specific geography and calibration information for that channel
 613  * is contained in the eeprom map itself.
 614  *
 615  * During init, we copy the eeprom information and channel map
 616  * information into il->channel_info_24/52 and il->channel_map_24/52
 617  *
 618  * channel_map_24/52 provides the idx in the channel_info array for a
 619  * given channel.  We have to have two separate maps as there is channel
 620  * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
 621  * band_2
 622  *
 623  * A value of 0xff stored in the channel_map indicates that the channel
 624  * is not supported by the hardware at all.
 625  *
 626  * A value of 0xfe in the channel_map indicates that the channel is not
 627  * valid for Tx with the current hardware.  This means that
 628  * while the system can tune and receive on a given channel, it may not
 629  * be able to associate or transmit any frames on that
 630  * channel.  There is no corresponding channel information for that
 631  * entry.
 632  *
 633  *********************************************************************/
 634
 635 /* 2.4 GHz */
 636 const u8 il_eeprom_band_1[14] = {
 637         1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
 638 };
 639
 640 /* 5.2 GHz bands */
 641 static const u8 il_eeprom_band_2[] = {  /* 4915-5080MHz */
 642         183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
 643 };
 644
 645 static const u8 il_eeprom_band_3[] = {  /* 5170-5320MHz */
 646         34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
 647 };
 648
 649 static const u8 il_eeprom_band_4[] = {  /* 5500-5700MHz */
 650         100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
 651 };
 652
 653 static const u8 il_eeprom_band_5[] = {  /* 5725-5825MHz */
 654         145, 149, 153, 157, 161, 165
 655 };
 656
 657 static const u8 il_eeprom_band_6[] = {  /* 2.4 ht40 channel */
 658         1, 2, 3, 4, 5, 6, 7
 659 };
 660
 661 static const u8 il_eeprom_band_7[] = {  /* 5.2 ht40 channel */
 662         36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
 663 };
 664
 665 /******************************************************************************
 666  *
 667  * EEPROM related functions
 668  *
 669 ******************************************************************************/
 670
 671 static int
 672 il_eeprom_verify_signature(struct il_priv *il)
 673 {
 674         u32 gp = _il_rd(il, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
 675         int ret = 0;
 676
 677         D_EEPROM("EEPROM signature=0x%08x\n", gp);
 678         switch (gp) {
 679         case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K:
 680         case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K:
 681                 break;
 682         default:
 683                 IL_ERR("bad EEPROM signature," "EEPROM_GP=0x%08x\n", gp);
 684                 ret = -ENOENT;
 685                 break;
 686         }
 687         return ret;
 688 }
 689
 690 const u8 *
 691 il_eeprom_query_addr(const struct il_priv *il, size_t offset)
 692 {
 693         BUG_ON(offset >= il->cfg->eeprom_size);
 694         return &il->eeprom[offset];
 695 }
 696 EXPORT_SYMBOL(il_eeprom_query_addr);
 697
 698 u16
 699 il_eeprom_query16(const struct il_priv *il, size_t offset)
 700 {
 701         if (!il->eeprom)
 702                 return 0;
 703         return (u16) il->eeprom[offset] | ((u16) il->eeprom[offset + 1] << 8);
 704 }
 705 EXPORT_SYMBOL(il_eeprom_query16);
 706
 707 /**
 708  * il_eeprom_init - read EEPROM contents
 709  *
 710  * Load the EEPROM contents from adapter into il->eeprom
 711  *
 712  * NOTE:  This routine uses the non-debug IO access functions.
 713  */
 714 int
 715 il_eeprom_init(struct il_priv *il)
 716 {
 717         __le16 *e;
 718         u32 gp = _il_rd(il, CSR_EEPROM_GP);
 719         int sz;
 720         int ret;
 721         u16 addr;
 722
 723         /* allocate eeprom */
 724         sz = il->cfg->eeprom_size;
 725         D_EEPROM("NVM size = %d\n", sz);
 726         il->eeprom = kzalloc(sz, GFP_KERNEL);
 727         if (!il->eeprom) {
 728                 ret = -ENOMEM;
 729                 goto alloc_err;
 730         }
 731         e = (__le16 *) il->eeprom;
 732
 733         il->ops->apm_init(il);
 734
 735         ret = il_eeprom_verify_signature(il);
 736         if (ret < 0) {
 737                 IL_ERR("EEPROM not found, EEPROM_GP=0x%08x\n", gp);
 738                 ret = -ENOENT;
 739                 goto err;
 740         }
 741
 742         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
 743         ret = il->ops->eeprom_acquire_semaphore(il);
 744         if (ret < 0) {
 745                 IL_ERR("Failed to acquire EEPROM semaphore.\n");
 746                 ret = -ENOENT;
 747                 goto err;
 748         }
 749
 750         /* eeprom is an array of 16bit values */
 751         for (addr = 0; addr < sz; addr += sizeof(u16)) {
 752                 u32 r;
 753
 754                 _il_wr(il, CSR_EEPROM_REG,
 755                        CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
 756
 757                 ret =
 758                     _il_poll_bit(il, CSR_EEPROM_REG,
 759                                  CSR_EEPROM_REG_READ_VALID_MSK,
 760                                  CSR_EEPROM_REG_READ_VALID_MSK,
 761                                  IL_EEPROM_ACCESS_TIMEOUT);
 762                 if (ret < 0) {
 763                         IL_ERR("Time out reading EEPROM[%d]\n", addr);
 764                         goto done;
 765                 }
 766                 r = _il_rd(il, CSR_EEPROM_REG);
 767                 e[addr / 2] = cpu_to_le16(r >> 16);
 768         }
 769
 770         D_EEPROM("NVM Type: %s, version: 0x%x\n", "EEPROM",
 771                  il_eeprom_query16(il, EEPROM_VERSION));
 772
 773         ret = 0;
 774 done:
 775         il->ops->eeprom_release_semaphore(il);
 776
 777 err:
 778         if (ret)
 779                 il_eeprom_free(il);
 780         /* Reset chip to save power until we load uCode during "up". */
 781         il_apm_stop(il);
 782 alloc_err:
 783         return ret;
 784 }
 785 EXPORT_SYMBOL(il_eeprom_init);
 786
 787 void
 788 il_eeprom_free(struct il_priv *il)
 789 {
 790         kfree(il->eeprom);
 791         il->eeprom = NULL;
 792 }
 793 EXPORT_SYMBOL(il_eeprom_free);
 794
 795 static void
 796 il_init_band_reference(const struct il_priv *il, int eep_band,
 797                        int *eeprom_ch_count,
 798                        const struct il_eeprom_channel **eeprom_ch_info,
 799                        const u8 **eeprom_ch_idx)
 800 {
 801         u32 offset = il->cfg->regulatory_bands[eep_band - 1];
 802
 803         switch (eep_band) {
 804         case 1:         /* 2.4GHz band */
 805                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_1);
 806                 *eeprom_ch_info =
 807                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 808                                                                      offset);
 809                 *eeprom_ch_idx = il_eeprom_band_1;
 810                 break;
 811         case 2:         /* 4.9GHz band */
 812                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_2);
 813                 *eeprom_ch_info =
 814                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 815                                                                      offset);
 816                 *eeprom_ch_idx = il_eeprom_band_2;
 817                 break;
 818         case 3:         /* 5.2GHz band */
 819                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_3);
 820                 *eeprom_ch_info =
 821                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 822                                                                      offset);
 823                 *eeprom_ch_idx = il_eeprom_band_3;
 824                 break;
 825         case 4:         /* 5.5GHz band */
 826                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_4);
 827                 *eeprom_ch_info =
 828                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 829                                                                      offset);
 830                 *eeprom_ch_idx = il_eeprom_band_4;
 831                 break;
 832         case 5:         /* 5.7GHz band */
 833                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_5);
 834                 *eeprom_ch_info =
 835                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 836                                                                      offset);
 837                 *eeprom_ch_idx = il_eeprom_band_5;
 838                 break;
 839         case 6:         /* 2.4GHz ht40 channels */
 840                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_6);
 841                 *eeprom_ch_info =
 842                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 843                                                                      offset);
 844                 *eeprom_ch_idx = il_eeprom_band_6;
 845                 break;
 846         case 7:         /* 5 GHz ht40 channels */
 847                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_7);
 848                 *eeprom_ch_info =
 849                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 850                                                                      offset);
 851                 *eeprom_ch_idx = il_eeprom_band_7;
 852                 break;
 853         default:
 854                 BUG();
 855         }
 856 }
 857
 858 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
 859                             ? # x " " : "")
 860 /**
 861  * il_mod_ht40_chan_info - Copy ht40 channel info into driver's il.
 862  *
 863  * Does not set up a command, or touch hardware.
 864  */
 865 static int
 866 il_mod_ht40_chan_info(struct il_priv *il, enum ieee80211_band band, u16 channel,
 867                       const struct il_eeprom_channel *eeprom_ch,
 868                       u8 clear_ht40_extension_channel)
 869 {
 870         struct il_channel_info *ch_info;
 871
 872         ch_info =
 873             (struct il_channel_info *)il_get_channel_info(il, band, channel);
 874
 875         if (!il_is_channel_valid(ch_info))
 876                 return -1;
 877
 878         D_EEPROM("HT40 Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
 879                  " Ad-Hoc %ssupported\n", ch_info->channel,
 880                  il_is_channel_a_band(ch_info) ? "5.2" : "2.4",
 881                  CHECK_AND_PRINT(IBSS), CHECK_AND_PRINT(ACTIVE),
 882                  CHECK_AND_PRINT(RADAR), CHECK_AND_PRINT(WIDE),
 883                  CHECK_AND_PRINT(DFS), eeprom_ch->flags,
 884                  eeprom_ch->max_power_avg,
 885                  ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS) &&
 886                   !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ? "" : "not ");
 887
 888         ch_info->ht40_eeprom = *eeprom_ch;
 889         ch_info->ht40_max_power_avg = eeprom_ch->max_power_avg;
 890         ch_info->ht40_flags = eeprom_ch->flags;
 891         if (eeprom_ch->flags & EEPROM_CHANNEL_VALID)
 892                 ch_info->ht40_extension_channel &=
 893                     ~clear_ht40_extension_channel;
 894
 895         return 0;
 896 }
 897
 898 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
 899                             ? # x " " : "")
 900
 901 /**
 902  * il_init_channel_map - Set up driver's info for all possible channels
 903  */
 904 int
 905 il_init_channel_map(struct il_priv *il)
 906 {
 907         int eeprom_ch_count = 0;
 908         const u8 *eeprom_ch_idx = NULL;
 909         const struct il_eeprom_channel *eeprom_ch_info = NULL;
 910         int band, ch;
 911         struct il_channel_info *ch_info;
 912
 913         if (il->channel_count) {
 914                 D_EEPROM("Channel map already initialized.\n");
 915                 return 0;
 916         }
 917
 918         D_EEPROM("Initializing regulatory info from EEPROM\n");
 919
 920         il->channel_count =
 921             ARRAY_SIZE(il_eeprom_band_1) + ARRAY_SIZE(il_eeprom_band_2) +
 922             ARRAY_SIZE(il_eeprom_band_3) + ARRAY_SIZE(il_eeprom_band_4) +
 923             ARRAY_SIZE(il_eeprom_band_5);
 924
 925         D_EEPROM("Parsing data for %d channels.\n", il->channel_count);
 926
 927         il->channel_info =
 928             kzalloc(sizeof(struct il_channel_info) * il->channel_count,
 929                     GFP_KERNEL);
 930         if (!il->channel_info) {
 931                 IL_ERR("Could not allocate channel_info\n");
 932                 il->channel_count = 0;
 933                 return -ENOMEM;
 934         }
 935
 936         ch_info = il->channel_info;
 937
 938         /* Loop through the 5 EEPROM bands adding them in order to the
 939          * channel map we maintain (that contains additional information than
 940          * what just in the EEPROM) */
 941         for (band = 1; band <= 5; band++) {
 942
 943                 il_init_band_reference(il, band, &eeprom_ch_count,
 944                                        &eeprom_ch_info, &eeprom_ch_idx);
 945
 946                 /* Loop through each band adding each of the channels */
 947                 for (ch = 0; ch < eeprom_ch_count; ch++) {
 948                         ch_info->channel = eeprom_ch_idx[ch];
 949                         ch_info->band =
 950                             (band ==
 951                              1) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 952
 953                         /* permanently store EEPROM's channel regulatory flags
 954                          *   and max power in channel info database. */
 955                         ch_info->eeprom = eeprom_ch_info[ch];
 956
 957                         /* Copy the run-time flags so they are there even on
 958                          * invalid channels */
 959                         ch_info->flags = eeprom_ch_info[ch].flags;
 960                         /* First write that ht40 is not enabled, and then enable
 961                          * one by one */
 962                         ch_info->ht40_extension_channel =
 963                             IEEE80211_CHAN_NO_HT40;
 964
 965                         if (!(il_is_channel_valid(ch_info))) {
 966                                 D_EEPROM("Ch. %d Flags %x [%sGHz] - "
 967                                          "No traffic\n", ch_info->channel,
 968                                          ch_info->flags,
 969                                          il_is_channel_a_band(ch_info) ? "5.2" :
 970                                          "2.4");
 971                                 ch_info++;
 972                                 continue;
 973                         }
 974
 975                         /* Initialize regulatory-based run-time data */
 976                         ch_info->max_power_avg = ch_info->curr_txpow =
 977                             eeprom_ch_info[ch].max_power_avg;
 978                         ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
 979                         ch_info->min_power = 0;
 980
 981                         D_EEPROM("Ch. %d [%sGHz] " "%s%s%s%s%s%s(0x%02x %ddBm):"
 982                                  " Ad-Hoc %ssupported\n", ch_info->channel,
 983                                  il_is_channel_a_band(ch_info) ? "5.2" : "2.4",
 984                                  CHECK_AND_PRINT_I(VALID),
 985                                  CHECK_AND_PRINT_I(IBSS),
 986                                  CHECK_AND_PRINT_I(ACTIVE),
 987                                  CHECK_AND_PRINT_I(RADAR),
 988                                  CHECK_AND_PRINT_I(WIDE),
 989                                  CHECK_AND_PRINT_I(DFS),
 990                                  eeprom_ch_info[ch].flags,
 991                                  eeprom_ch_info[ch].max_power_avg,
 992                                  ((eeprom_ch_info[ch].
 993                                    flags & EEPROM_CHANNEL_IBSS) &&
 994                                   !(eeprom_ch_info[ch].
 995                                     flags & EEPROM_CHANNEL_RADAR)) ? "" :
 996                                  "not ");
 997
 998                         ch_info++;
 999                 }
1000         }
1001
1002         /* Check if we do have HT40 channels */
1003         if (il->cfg->regulatory_bands[5] == EEPROM_REGULATORY_BAND_NO_HT40 &&
1004             il->cfg->regulatory_bands[6] == EEPROM_REGULATORY_BAND_NO_HT40)
1005                 return 0;
1006
1007         /* Two additional EEPROM bands for 2.4 and 5 GHz HT40 channels */
1008         for (band = 6; band <= 7; band++) {
1009                 enum ieee80211_band ieeeband;
1010
1011                 il_init_band_reference(il, band, &eeprom_ch_count,
1012                                        &eeprom_ch_info, &eeprom_ch_idx);
1013
1014                 /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
1015                 ieeeband =
1016                     (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1017
1018                 /* Loop through each band adding each of the channels */
1019                 for (ch = 0; ch < eeprom_ch_count; ch++) {
1020                         /* Set up driver's info for lower half */
1021                         il_mod_ht40_chan_info(il, ieeeband, eeprom_ch_idx[ch],
1022                                               &eeprom_ch_info[ch],
1023                                               IEEE80211_CHAN_NO_HT40PLUS);
1024
1025                         /* Set up driver's info for upper half */
1026                         il_mod_ht40_chan_info(il, ieeeband,
1027                                               eeprom_ch_idx[ch] + 4,
1028                                               &eeprom_ch_info[ch],
1029                                               IEEE80211_CHAN_NO_HT40MINUS);
1030                 }
1031         }
1032
1033         return 0;
1034 }
1035 EXPORT_SYMBOL(il_init_channel_map);
1036
1037 /*
1038  * il_free_channel_map - undo allocations in il_init_channel_map
1039  */
1040 void
1041 il_free_channel_map(struct il_priv *il)
1042 {
1043         kfree(il->channel_info);
1044         il->channel_count = 0;
1045 }
1046 EXPORT_SYMBOL(il_free_channel_map);
1047
1048 /**
1049  * il_get_channel_info - Find driver's ilate channel info
1050  *
1051  * Based on band and channel number.
1052  */
1053 const struct il_channel_info *
1054 il_get_channel_info(const struct il_priv *il, enum ieee80211_band band,
1055                     u16 channel)
1056 {
1057         int i;
1058
1059         switch (band) {
1060         case IEEE80211_BAND_5GHZ:
1061                 for (i = 14; i < il->channel_count; i++) {
1062                         if (il->channel_info[i].channel == channel)
1063                                 return &il->channel_info[i];
1064                 }
1065                 break;
1066         case IEEE80211_BAND_2GHZ:
1067                 if (channel >= 1 && channel <= 14)
1068                         return &il->channel_info[channel - 1];
1069                 break;
1070         default:
1071                 BUG();
1072         }
1073
1074         return NULL;
1075 }
1076 EXPORT_SYMBOL(il_get_channel_info);
1077
1078 /*
1079  * Setting power level allows the card to go to sleep when not busy.
1080  *
1081  * We calculate a sleep command based on the required latency, which
1082  * we get from mac80211. In order to handle thermal throttling, we can
1083  * also use pre-defined power levels.
1084  */
1085
1086 /*
1087  * This defines the old power levels. They are still used by default
1088  * (level 1) and for thermal throttle (levels 3 through 5)
1089  */
1090
1091 struct il_power_vec_entry {
1092         struct il_powertable_cmd cmd;
1093         u8 no_dtim;             /* number of skip dtim */
1094 };
1095
1096 static void
1097 il_power_sleep_cam_cmd(struct il_priv *il, struct il_powertable_cmd *cmd)
1098 {
1099         memset(cmd, 0, sizeof(*cmd));
1100
1101         if (il->power_data.pci_pm)
1102                 cmd->flags |= IL_POWER_PCI_PM_MSK;
1103
1104         D_POWER("Sleep command for CAM\n");
1105 }
1106
1107 static int
1108 il_set_power(struct il_priv *il, struct il_powertable_cmd *cmd)
1109 {
1110         D_POWER("Sending power/sleep command\n");
1111         D_POWER("Flags value = 0x%08X\n", cmd->flags);
1112         D_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
1113         D_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
1114         D_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
1115                 le32_to_cpu(cmd->sleep_interval[0]),
1116                 le32_to_cpu(cmd->sleep_interval[1]),
1117                 le32_to_cpu(cmd->sleep_interval[2]),
1118                 le32_to_cpu(cmd->sleep_interval[3]),
1119                 le32_to_cpu(cmd->sleep_interval[4]));
1120
1121         return il_send_cmd_pdu(il, C_POWER_TBL,
1122                                sizeof(struct il_powertable_cmd), cmd);
1123 }
1124
1125 int
1126 il_power_set_mode(struct il_priv *il, struct il_powertable_cmd *cmd, bool force)
1127 {
1128         int ret;
1129         bool update_chains;
1130
1131         lockdep_assert_held(&il->mutex);
1132
1133         /* Don't update the RX chain when chain noise calibration is running */
1134         update_chains = il->chain_noise_data.state == IL_CHAIN_NOISE_DONE ||
1135             il->chain_noise_data.state == IL_CHAIN_NOISE_ALIVE;
1136
1137         if (!memcmp(&il->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
1138                 return 0;
1139
1140         if (!il_is_ready_rf(il))
1141                 return -EIO;
1142
1143         /* scan complete use sleep_power_next, need to be updated */
1144         memcpy(&il->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
1145         if (test_bit(S_SCANNING, &il->status) && !force) {
1146                 D_INFO("Defer power set mode while scanning\n");
1147                 return 0;
1148         }
1149
1150         if (cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK)
1151                 set_bit(S_POWER_PMI, &il->status);
1152
1153         ret = il_set_power(il, cmd);
1154         if (!ret) {
1155                 if (!(cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK))
1156                         clear_bit(S_POWER_PMI, &il->status);
1157
1158                 if (il->ops->update_chain_flags && update_chains)
1159                         il->ops->update_chain_flags(il);
1160                 else if (il->ops->update_chain_flags)
1161                         D_POWER("Cannot update the power, chain noise "
1162                                 "calibration running: %d\n",
1163                                 il->chain_noise_data.state);
1164
1165                 memcpy(&il->power_data.sleep_cmd, cmd, sizeof(*cmd));
1166         } else
1167                 IL_ERR("set power fail, ret = %d", ret);
1168
1169         return ret;
1170 }
1171
1172 int
1173 il_power_update_mode(struct il_priv *il, bool force)
1174 {
1175         struct il_powertable_cmd cmd;
1176
1177         il_power_sleep_cam_cmd(il, &cmd);
1178         return il_power_set_mode(il, &cmd, force);
1179 }
1180 EXPORT_SYMBOL(il_power_update_mode);
1181
1182 /* initialize to default */
1183 void
1184 il_power_initialize(struct il_priv *il)
1185 {
1186         u16 lctl = il_pcie_link_ctl(il);
1187
1188         il->power_data.pci_pm = !(lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN);
1189
1190         il->power_data.debug_sleep_level_override = -1;
1191
1192         memset(&il->power_data.sleep_cmd, 0, sizeof(il->power_data.sleep_cmd));
1193 }
1194 EXPORT_SYMBOL(il_power_initialize);
1195
1196 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
1197  * sending probe req.  This should be set long enough to hear probe responses
1198  * from more than one AP.  */
1199 #define IL_ACTIVE_DWELL_TIME_24    (30) /* all times in msec */
1200 #define IL_ACTIVE_DWELL_TIME_52    (20)
1201
1202 #define IL_ACTIVE_DWELL_FACTOR_24GHZ (3)
1203 #define IL_ACTIVE_DWELL_FACTOR_52GHZ (2)
1204
1205 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
1206  * Must be set longer than active dwell time.
1207  * For the most reliable scan, set > AP beacon interval (typically 100msec). */
1208 #define IL_PASSIVE_DWELL_TIME_24   (20) /* all times in msec */
1209 #define IL_PASSIVE_DWELL_TIME_52   (10)
1210 #define IL_PASSIVE_DWELL_BASE      (100)
1211 #define IL_CHANNEL_TUNE_TIME       5
1212
1213 static int
1214 il_send_scan_abort(struct il_priv *il)
1215 {
1216         int ret;
1217         struct il_rx_pkt *pkt;
1218         struct il_host_cmd cmd = {
1219                 .id = C_SCAN_ABORT,
1220                 .flags = CMD_WANT_SKB,
1221         };
1222
1223         /* Exit instantly with error when device is not ready
1224          * to receive scan abort command or it does not perform
1225          * hardware scan currently */
1226         if (!test_bit(S_READY, &il->status) ||
1227             !test_bit(S_GEO_CONFIGURED, &il->status) ||
1228             !test_bit(S_SCAN_HW, &il->status) ||
1229             test_bit(S_FW_ERROR, &il->status) ||
1230             test_bit(S_EXIT_PENDING, &il->status))
1231                 return -EIO;
1232
1233         ret = il_send_cmd_sync(il, &cmd);
1234         if (ret)
1235                 return ret;
1236
1237         pkt = (struct il_rx_pkt *)cmd.reply_page;
1238         if (pkt->u.status != CAN_ABORT_STATUS) {
1239                 /* The scan abort will return 1 for success or
1240                  * 2 for "failure".  A failure condition can be
1241                  * due to simply not being in an active scan which
1242                  * can occur if we send the scan abort before we
1243                  * the microcode has notified us that a scan is
1244                  * completed. */
1245                 D_SCAN("SCAN_ABORT ret %d.\n", pkt->u.status);
1246                 ret = -EIO;
1247         }
1248
1249         il_free_pages(il, cmd.reply_page);
1250         return ret;
1251 }
1252
1253 static void
1254 il_complete_scan(struct il_priv *il, bool aborted)
1255 {
1256         /* check if scan was requested from mac80211 */
1257         if (il->scan_request) {
1258                 D_SCAN("Complete scan in mac80211\n");
1259                 ieee80211_scan_completed(il->hw, aborted);
1260         }
1261
1262         il->scan_vif = NULL;
1263         il->scan_request = NULL;
1264 }
1265
1266 void
1267 il_force_scan_end(struct il_priv *il)
1268 {
1269         lockdep_assert_held(&il->mutex);
1270
1271         if (!test_bit(S_SCANNING, &il->status)) {
1272                 D_SCAN("Forcing scan end while not scanning\n");
1273                 return;
1274         }
1275
1276         D_SCAN("Forcing scan end\n");
1277         clear_bit(S_SCANNING, &il->status);
1278         clear_bit(S_SCAN_HW, &il->status);
1279         clear_bit(S_SCAN_ABORTING, &il->status);
1280         il_complete_scan(il, true);
1281 }
1282
1283 static void
1284 il_do_scan_abort(struct il_priv *il)
1285 {
1286         int ret;
1287
1288         lockdep_assert_held(&il->mutex);
1289
1290         if (!test_bit(S_SCANNING, &il->status)) {
1291                 D_SCAN("Not performing scan to abort\n");
1292                 return;
1293         }
1294
1295         if (test_and_set_bit(S_SCAN_ABORTING, &il->status)) {
1296                 D_SCAN("Scan abort in progress\n");
1297                 return;
1298         }
1299
1300         ret = il_send_scan_abort(il);
1301         if (ret) {
1302                 D_SCAN("Send scan abort failed %d\n", ret);
1303                 il_force_scan_end(il);
1304         } else
1305                 D_SCAN("Successfully send scan abort\n");
1306 }
1307
1308 /**
1309  * il_scan_cancel - Cancel any currently executing HW scan
1310  */
1311 int
1312 il_scan_cancel(struct il_priv *il)
1313 {
1314         D_SCAN("Queuing abort scan\n");
1315         queue_work(il->workqueue, &il->abort_scan);
1316         return 0;
1317 }
1318 EXPORT_SYMBOL(il_scan_cancel);
1319
1320 /**
1321  * il_scan_cancel_timeout - Cancel any currently executing HW scan
1322  * @ms: amount of time to wait (in milliseconds) for scan to abort
1323  *
1324  */
1325 int
1326 il_scan_cancel_timeout(struct il_priv *il, unsigned long ms)
1327 {
1328         unsigned long timeout = jiffies + msecs_to_jiffies(ms);
1329
1330         lockdep_assert_held(&il->mutex);
1331
1332         D_SCAN("Scan cancel timeout\n");
1333
1334         il_do_scan_abort(il);
1335
1336         while (time_before_eq(jiffies, timeout)) {
1337                 if (!test_bit(S_SCAN_HW, &il->status))
1338                         break;
1339                 msleep(20);
1340         }
1341
1342         return test_bit(S_SCAN_HW, &il->status);
1343 }
1344 EXPORT_SYMBOL(il_scan_cancel_timeout);
1345
1346 /* Service response to C_SCAN (0x80) */
1347 static void
1348 il_hdl_scan(struct il_priv *il, struct il_rx_buf *rxb)
1349 {
1350 #ifdef CONFIG_IWLEGACY_DEBUG
1351         struct il_rx_pkt *pkt = rxb_addr(rxb);
1352         struct il_scanreq_notification *notif =
1353             (struct il_scanreq_notification *)pkt->u.raw;
1354
1355         D_SCAN("Scan request status = 0x%x\n", notif->status);
1356 #endif
1357 }
1358
1359 /* Service N_SCAN_START (0x82) */
1360 static void
1361 il_hdl_scan_start(struct il_priv *il, struct il_rx_buf *rxb)
1362 {
1363         struct il_rx_pkt *pkt = rxb_addr(rxb);
1364         struct il_scanstart_notification *notif =
1365             (struct il_scanstart_notification *)pkt->u.raw;
1366         il->scan_start_tsf = le32_to_cpu(notif->tsf_low);
1367         D_SCAN("Scan start: " "%d [802.11%s] "
1368                "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", notif->channel,
1369                notif->band ? "bg" : "a", le32_to_cpu(notif->tsf_high),
1370                le32_to_cpu(notif->tsf_low), notif->status, notif->beacon_timer);
1371 }
1372
1373 /* Service N_SCAN_RESULTS (0x83) */
1374 static void
1375 il_hdl_scan_results(struct il_priv *il, struct il_rx_buf *rxb)
1376 {
1377 #ifdef CONFIG_IWLEGACY_DEBUG
1378         struct il_rx_pkt *pkt = rxb_addr(rxb);
1379         struct il_scanresults_notification *notif =
1380             (struct il_scanresults_notification *)pkt->u.raw;
1381
1382         D_SCAN("Scan ch.res: " "%d [802.11%s] " "(TSF: 0x%08X:%08X) - %d "
1383                "elapsed=%lu usec\n", notif->channel, notif->band ? "bg" : "a",
1384                le32_to_cpu(notif->tsf_high), le32_to_cpu(notif->tsf_low),
1385                le32_to_cpu(notif->stats[0]),
1386                le32_to_cpu(notif->tsf_low) - il->scan_start_tsf);
1387 #endif
1388 }
1389
1390 /* Service N_SCAN_COMPLETE (0x84) */
1391 static void
1392 il_hdl_scan_complete(struct il_priv *il, struct il_rx_buf *rxb)
1393 {
1394
1395 #ifdef CONFIG_IWLEGACY_DEBUG
1396         struct il_rx_pkt *pkt = rxb_addr(rxb);
1397         struct il_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
1398 #endif
1399
1400         D_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
1401                scan_notif->scanned_channels, scan_notif->tsf_low,
1402                scan_notif->tsf_high, scan_notif->status);
1403
1404         /* The HW is no longer scanning */
1405         clear_bit(S_SCAN_HW, &il->status);
1406
1407         D_SCAN("Scan on %sGHz took %dms\n",
1408                (il->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
1409                jiffies_to_msecs(jiffies - il->scan_start));
1410
1411         queue_work(il->workqueue, &il->scan_completed);
1412 }
1413
1414 void
1415 il_setup_rx_scan_handlers(struct il_priv *il)
1416 {
1417         /* scan handlers */
1418         il->handlers[C_SCAN] = il_hdl_scan;
1419         il->handlers[N_SCAN_START] = il_hdl_scan_start;
1420         il->handlers[N_SCAN_RESULTS] = il_hdl_scan_results;
1421         il->handlers[N_SCAN_COMPLETE] = il_hdl_scan_complete;
1422 }
1423 EXPORT_SYMBOL(il_setup_rx_scan_handlers);
1424
1425 inline u16
1426 il_get_active_dwell_time(struct il_priv *il, enum ieee80211_band band,
1427                          u8 n_probes)
1428 {
1429         if (band == IEEE80211_BAND_5GHZ)
1430                 return IL_ACTIVE_DWELL_TIME_52 +
1431                     IL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
1432         else
1433                 return IL_ACTIVE_DWELL_TIME_24 +
1434                     IL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
1435 }
1436 EXPORT_SYMBOL(il_get_active_dwell_time);
1437
1438 u16
1439 il_get_passive_dwell_time(struct il_priv *il, enum ieee80211_band band,
1440                           struct ieee80211_vif *vif)
1441 {
1442         u16 value;
1443
1444         u16 passive =
1445             (band ==
1446              IEEE80211_BAND_2GHZ) ? IL_PASSIVE_DWELL_BASE +
1447             IL_PASSIVE_DWELL_TIME_24 : IL_PASSIVE_DWELL_BASE +
1448             IL_PASSIVE_DWELL_TIME_52;
1449
1450         if (il_is_any_associated(il)) {
1451                 /*
1452                  * If we're associated, we clamp the maximum passive
1453                  * dwell time to be 98% of the smallest beacon interval
1454                  * (minus 2 * channel tune time)
1455                  */
1456                 value = il->vif ? il->vif->bss_conf.beacon_int : 0;
1457                 if (value > IL_PASSIVE_DWELL_BASE || !value)
1458                         value = IL_PASSIVE_DWELL_BASE;
1459                 value = (value * 98) / 100 - IL_CHANNEL_TUNE_TIME * 2;
1460                 passive = min(value, passive);
1461         }
1462
1463         return passive;
1464 }
1465 EXPORT_SYMBOL(il_get_passive_dwell_time);
1466
1467 void
1468 il_init_scan_params(struct il_priv *il)
1469 {
1470         u8 ant_idx = fls(il->hw_params.valid_tx_ant) - 1;
1471         if (!il->scan_tx_ant[IEEE80211_BAND_5GHZ])
1472                 il->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
1473         if (!il->scan_tx_ant[IEEE80211_BAND_2GHZ])
1474                 il->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
1475 }
1476 EXPORT_SYMBOL(il_init_scan_params);
1477
1478 static int
1479 il_scan_initiate(struct il_priv *il, struct ieee80211_vif *vif)
1480 {
1481         int ret;
1482
1483         lockdep_assert_held(&il->mutex);
1484
1485         cancel_delayed_work(&il->scan_check);
1486
1487         if (!il_is_ready_rf(il)) {
1488                 IL_WARN("Request scan called when driver not ready.\n");
1489                 return -EIO;
1490         }
1491
1492         if (test_bit(S_SCAN_HW, &il->status)) {
1493                 D_SCAN("Multiple concurrent scan requests in parallel.\n");
1494                 return -EBUSY;
1495         }
1496
1497         if (test_bit(S_SCAN_ABORTING, &il->status)) {
1498                 D_SCAN("Scan request while abort pending.\n");
1499                 return -EBUSY;
1500         }
1501
1502         D_SCAN("Starting scan...\n");
1503
1504         set_bit(S_SCANNING, &il->status);
1505         il->scan_start = jiffies;
1506
1507         ret = il->ops->request_scan(il, vif);
1508         if (ret) {
1509                 clear_bit(S_SCANNING, &il->status);
1510                 return ret;
1511         }
1512
1513         queue_delayed_work(il->workqueue, &il->scan_check,
1514                            IL_SCAN_CHECK_WATCHDOG);
1515
1516         return 0;
1517 }
1518
1519 int
1520 il_mac_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1521                struct cfg80211_scan_request *req)
1522 {
1523         struct il_priv *il = hw->priv;
1524         int ret;
1525
1526         if (req->n_channels == 0) {
1527                 IL_ERR("Can not scan on no channels.\n");
1528                 return -EINVAL;
1529         }
1530
1531         mutex_lock(&il->mutex);
1532         D_MAC80211("enter\n");
1533
1534         if (test_bit(S_SCANNING, &il->status)) {
1535                 D_SCAN("Scan already in progress.\n");
1536                 ret = -EAGAIN;
1537                 goto out_unlock;
1538         }
1539
1540         /* mac80211 will only ask for one band at a time */
1541         il->scan_request = req;
1542         il->scan_vif = vif;
1543         il->scan_band = req->channels[0]->band;
1544
1545         ret = il_scan_initiate(il, vif);
1546
1547 out_unlock:
1548         D_MAC80211("leave ret %d\n", ret);
1549         mutex_unlock(&il->mutex);
1550
1551         return ret;
1552 }
1553 EXPORT_SYMBOL(il_mac_hw_scan);
1554
1555 static void
1556 il_bg_scan_check(struct work_struct *data)
1557 {
1558         struct il_priv *il =
1559             container_of(data, struct il_priv, scan_check.work);
1560
1561         D_SCAN("Scan check work\n");
1562
1563         /* Since we are here firmware does not finish scan and
1564          * most likely is in bad shape, so we don't bother to
1565          * send abort command, just force scan complete to mac80211 */
1566         mutex_lock(&il->mutex);
1567         il_force_scan_end(il);
1568         mutex_unlock(&il->mutex);
1569 }
1570
1571 /**
1572  * il_fill_probe_req - fill in all required fields and IE for probe request
1573  */
1574
1575 u16
1576 il_fill_probe_req(struct il_priv *il, struct ieee80211_mgmt *frame,
1577                   const u8 *ta, const u8 *ies, int ie_len, int left)
1578 {
1579         int len = 0;
1580         u8 *pos = NULL;
1581
1582         /* Make sure there is enough space for the probe request,
1583          * two mandatory IEs and the data */
1584         left -= 24;
1585         if (left < 0)
1586                 return 0;
1587
1588         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
1589         memcpy(frame->da, il_bcast_addr, ETH_ALEN);
1590         memcpy(frame->sa, ta, ETH_ALEN);
1591         memcpy(frame->bssid, il_bcast_addr, ETH_ALEN);
1592         frame->seq_ctrl = 0;
1593
1594         len += 24;
1595
1596         /* ...next IE... */
1597         pos = &frame->u.probe_req.variable[0];
1598
1599         /* fill in our indirect SSID IE */
1600         left -= 2;
1601         if (left < 0)
1602                 return 0;
1603         *pos++ = WLAN_EID_SSID;
1604         *pos++ = 0;
1605
1606         len += 2;
1607
1608         if (WARN_ON(left < ie_len))
1609                 return len;
1610
1611         if (ies && ie_len) {
1612                 memcpy(pos, ies, ie_len);
1613                 len += ie_len;
1614         }
1615
1616         return (u16) len;
1617 }
1618 EXPORT_SYMBOL(il_fill_probe_req);
1619
1620 static void
1621 il_bg_abort_scan(struct work_struct *work)
1622 {
1623         struct il_priv *il = container_of(work, struct il_priv, abort_scan);
1624
1625         D_SCAN("Abort scan work\n");
1626
1627         /* We keep scan_check work queued in case when firmware will not
1628          * report back scan completed notification */
1629         mutex_lock(&il->mutex);
1630         il_scan_cancel_timeout(il, 200);
1631         mutex_unlock(&il->mutex);
1632 }
1633
1634 static void
1635 il_bg_scan_completed(struct work_struct *work)
1636 {
1637         struct il_priv *il = container_of(work, struct il_priv, scan_completed);
1638         bool aborted;
1639
1640         D_SCAN("Completed scan.\n");
1641
1642         cancel_delayed_work(&il->scan_check);
1643
1644         mutex_lock(&il->mutex);
1645
1646         aborted = test_and_clear_bit(S_SCAN_ABORTING, &il->status);
1647         if (aborted)
1648                 D_SCAN("Aborted scan completed.\n");
1649
1650         if (!test_and_clear_bit(S_SCANNING, &il->status)) {
1651                 D_SCAN("Scan already completed.\n");
1652                 goto out_settings;
1653         }
1654
1655         il_complete_scan(il, aborted);
1656
1657 out_settings:
1658         /* Can we still talk to firmware ? */
1659         if (!il_is_ready_rf(il))
1660                 goto out;
1661
1662         /*
1663          * We do not commit power settings while scan is pending,
1664          * do it now if the settings changed.
1665          */
1666         il_power_set_mode(il, &il->power_data.sleep_cmd_next, false);
1667         il_set_tx_power(il, il->tx_power_next, false);
1668
1669         il->ops->post_scan(il);
1670
1671 out:
1672         mutex_unlock(&il->mutex);
1673 }
1674
1675 void
1676 il_setup_scan_deferred_work(struct il_priv *il)
1677 {
1678         INIT_WORK(&il->scan_completed, il_bg_scan_completed);
1679         INIT_WORK(&il->abort_scan, il_bg_abort_scan);
1680         INIT_DELAYED_WORK(&il->scan_check, il_bg_scan_check);
1681 }
1682 EXPORT_SYMBOL(il_setup_scan_deferred_work);
1683
1684 void
1685 il_cancel_scan_deferred_work(struct il_priv *il)
1686 {
1687         cancel_work_sync(&il->abort_scan);
1688         cancel_work_sync(&il->scan_completed);
1689
1690         if (cancel_delayed_work_sync(&il->scan_check)) {
1691                 mutex_lock(&il->mutex);
1692                 il_force_scan_end(il);
1693                 mutex_unlock(&il->mutex);
1694         }
1695 }
1696 EXPORT_SYMBOL(il_cancel_scan_deferred_work);
1697
1698 /* il->sta_lock must be held */
1699 static void
1700 il_sta_ucode_activate(struct il_priv *il, u8 sta_id)
1701 {
1702
1703         if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE))
1704                 IL_ERR("ACTIVATE a non DRIVER active station id %u addr %pM\n",
1705                        sta_id, il->stations[sta_id].sta.sta.addr);
1706
1707         if (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) {
1708                 D_ASSOC("STA id %u addr %pM already present"
1709                         " in uCode (according to driver)\n", sta_id,
1710                         il->stations[sta_id].sta.sta.addr);
1711         } else {
1712                 il->stations[sta_id].used |= IL_STA_UCODE_ACTIVE;
1713                 D_ASSOC("Added STA id %u addr %pM to uCode\n", sta_id,
1714                         il->stations[sta_id].sta.sta.addr);
1715         }
1716 }
1717
1718 static int
1719 il_process_add_sta_resp(struct il_priv *il, struct il_addsta_cmd *addsta,
1720                         struct il_rx_pkt *pkt, bool sync)
1721 {
1722         u8 sta_id = addsta->sta.sta_id;
1723         unsigned long flags;
1724         int ret = -EIO;
1725
1726         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
1727                 IL_ERR("Bad return from C_ADD_STA (0x%08X)\n", pkt->hdr.flags);
1728                 return ret;
1729         }
1730
1731         D_INFO("Processing response for adding station %u\n", sta_id);
1732
1733         spin_lock_irqsave(&il->sta_lock, flags);
1734
1735         switch (pkt->u.add_sta.status) {
1736         case ADD_STA_SUCCESS_MSK:
1737                 D_INFO("C_ADD_STA PASSED\n");
1738                 il_sta_ucode_activate(il, sta_id);
1739                 ret = 0;
1740                 break;
1741         case ADD_STA_NO_ROOM_IN_TBL:
1742                 IL_ERR("Adding station %d failed, no room in table.\n", sta_id);
1743                 break;
1744         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
1745                 IL_ERR("Adding station %d failed, no block ack resource.\n",
1746                        sta_id);
1747                 break;
1748         case ADD_STA_MODIFY_NON_EXIST_STA:
1749                 IL_ERR("Attempting to modify non-existing station %d\n",
1750                        sta_id);
1751                 break;
1752         default:
1753                 D_ASSOC("Received C_ADD_STA:(0x%08X)\n", pkt->u.add_sta.status);
1754                 break;
1755         }
1756
1757         D_INFO("%s station id %u addr %pM\n",
1758                il->stations[sta_id].sta.mode ==
1759                STA_CONTROL_MODIFY_MSK ? "Modified" : "Added", sta_id,
1760                il->stations[sta_id].sta.sta.addr);
1761
1762         /*
1763          * XXX: The MAC address in the command buffer is often changed from
1764          * the original sent to the device. That is, the MAC address
1765          * written to the command buffer often is not the same MAC address
1766          * read from the command buffer when the command returns. This
1767          * issue has not yet been resolved and this debugging is left to
1768          * observe the problem.
1769          */
1770         D_INFO("%s station according to cmd buffer %pM\n",
1771                il->stations[sta_id].sta.mode ==
1772                STA_CONTROL_MODIFY_MSK ? "Modified" : "Added", addsta->sta.addr);
1773         spin_unlock_irqrestore(&il->sta_lock, flags);
1774
1775         return ret;
1776 }
1777
1778 static void
1779 il_add_sta_callback(struct il_priv *il, struct il_device_cmd *cmd,
1780                     struct il_rx_pkt *pkt)
1781 {
1782         struct il_addsta_cmd *addsta = (struct il_addsta_cmd *)cmd->cmd.payload;
1783
1784         il_process_add_sta_resp(il, addsta, pkt, false);
1785
1786 }
1787
1788 int
1789 il_send_add_sta(struct il_priv *il, struct il_addsta_cmd *sta, u8 flags)
1790 {
1791         struct il_rx_pkt *pkt = NULL;
1792         int ret = 0;
1793         u8 data[sizeof(*sta)];
1794         struct il_host_cmd cmd = {
1795                 .id = C_ADD_STA,
1796                 .flags = flags,
1797                 .data = data,
1798         };
1799         u8 sta_id __maybe_unused = sta->sta.sta_id;
1800
1801         D_INFO("Adding sta %u (%pM) %ssynchronously\n", sta_id, sta->sta.addr,
1802                flags & CMD_ASYNC ? "a" : "");
1803
1804         if (flags & CMD_ASYNC)
1805                 cmd.callback = il_add_sta_callback;
1806         else {
1807                 cmd.flags |= CMD_WANT_SKB;
1808                 might_sleep();
1809         }
1810
1811         cmd.len = il->ops->build_addsta_hcmd(sta, data);
1812         ret = il_send_cmd(il, &cmd);
1813
1814         if (ret || (flags & CMD_ASYNC))
1815                 return ret;
1816
1817         if (ret == 0) {
1818                 pkt = (struct il_rx_pkt *)cmd.reply_page;
1819                 ret = il_process_add_sta_resp(il, sta, pkt, true);
1820         }
1821         il_free_pages(il, cmd.reply_page);
1822
1823         return ret;
1824 }
1825 EXPORT_SYMBOL(il_send_add_sta);
1826
1827 static void
1828 il_set_ht_add_station(struct il_priv *il, u8 idx, struct ieee80211_sta *sta)
1829 {
1830         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
1831         __le32 sta_flags;
1832         u8 mimo_ps_mode;
1833
1834         if (!sta || !sta_ht_inf->ht_supported)
1835                 goto done;
1836
1837         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
1838         D_ASSOC("spatial multiplexing power save mode: %s\n",
1839                 (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ? "static" :
1840                 (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ? "dynamic" :
1841                 "disabled");
1842
1843         sta_flags = il->stations[idx].sta.station_flags;
1844
1845         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
1846
1847         switch (mimo_ps_mode) {
1848         case WLAN_HT_CAP_SM_PS_STATIC:
1849                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
1850                 break;
1851         case WLAN_HT_CAP_SM_PS_DYNAMIC:
1852                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
1853                 break;
1854         case WLAN_HT_CAP_SM_PS_DISABLED:
1855                 break;
1856         default:
1857                 IL_WARN("Invalid MIMO PS mode %d\n", mimo_ps_mode);
1858                 break;
1859         }
1860
1861         sta_flags |=
1862             cpu_to_le32((u32) sta_ht_inf->
1863                         ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
1864
1865         sta_flags |=
1866             cpu_to_le32((u32) sta_ht_inf->
1867                         ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
1868
1869         if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1870                 sta_flags |= STA_FLG_HT40_EN_MSK;
1871         else
1872                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
1873
1874         il->stations[idx].sta.station_flags = sta_flags;
1875 done:
1876         return;
1877 }
1878
1879 /**
1880  * il_prep_station - Prepare station information for addition
1881  *
1882  * should be called with sta_lock held
1883  */
1884 u8
1885 il_prep_station(struct il_priv *il, const u8 *addr, bool is_ap,
1886                 struct ieee80211_sta *sta)
1887 {
1888         struct il_station_entry *station;
1889         int i;
1890         u8 sta_id = IL_INVALID_STATION;
1891         u16 rate;
1892
1893         if (is_ap)
1894                 sta_id = IL_AP_ID;
1895         else if (is_broadcast_ether_addr(addr))
1896                 sta_id = il->hw_params.bcast_id;
1897         else
1898                 for (i = IL_STA_ID; i < il->hw_params.max_stations; i++) {
1899                         if (!compare_ether_addr
1900                             (il->stations[i].sta.sta.addr, addr)) {
1901                                 sta_id = i;
1902                                 break;
1903                         }
1904
1905                         if (!il->stations[i].used &&
1906                             sta_id == IL_INVALID_STATION)
1907                                 sta_id = i;
1908                 }
1909
1910         /*
1911          * These two conditions have the same outcome, but keep them
1912          * separate
1913          */
1914         if (unlikely(sta_id == IL_INVALID_STATION))
1915                 return sta_id;
1916
1917         /*
1918          * uCode is not able to deal with multiple requests to add a
1919          * station. Keep track if one is in progress so that we do not send
1920          * another.
1921          */
1922         if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
1923                 D_INFO("STA %d already in process of being added.\n", sta_id);
1924                 return sta_id;
1925         }
1926
1927         if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
1928             (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) &&
1929             !compare_ether_addr(il->stations[sta_id].sta.sta.addr, addr)) {
1930                 D_ASSOC("STA %d (%pM) already added, not adding again.\n",
1931                         sta_id, addr);
1932                 return sta_id;
1933         }
1934
1935         station = &il->stations[sta_id];
1936         station->used = IL_STA_DRIVER_ACTIVE;
1937         D_ASSOC("Add STA to driver ID %d: %pM\n", sta_id, addr);
1938         il->num_stations++;
1939
1940         /* Set up the C_ADD_STA command to send to device */
1941         memset(&station->sta, 0, sizeof(struct il_addsta_cmd));
1942         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
1943         station->sta.mode = 0;
1944         station->sta.sta.sta_id = sta_id;
1945         station->sta.station_flags = 0;
1946
1947         /*
1948          * OK to call unconditionally, since local stations (IBSS BSSID
1949          * STA and broadcast STA) pass in a NULL sta, and mac80211
1950          * doesn't allow HT IBSS.
1951          */
1952         il_set_ht_add_station(il, sta_id, sta);
1953
1954         /* 3945 only */
1955         rate = (il->band == IEEE80211_BAND_5GHZ) ? RATE_6M_PLCP : RATE_1M_PLCP;
1956         /* Turn on both antennas for the station... */
1957         station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
1958
1959         return sta_id;
1960
1961 }
1962 EXPORT_SYMBOL_GPL(il_prep_station);
1963
1964 #define STA_WAIT_TIMEOUT (HZ/2)
1965
1966 /**
1967  * il_add_station_common -
1968  */
1969 int
1970 il_add_station_common(struct il_priv *il, const u8 *addr, bool is_ap,
1971                       struct ieee80211_sta *sta, u8 *sta_id_r)
1972 {
1973         unsigned long flags_spin;
1974         int ret = 0;
1975         u8 sta_id;
1976         struct il_addsta_cmd sta_cmd;
1977
1978         *sta_id_r = 0;
1979         spin_lock_irqsave(&il->sta_lock, flags_spin);
1980         sta_id = il_prep_station(il, addr, is_ap, sta);
1981         if (sta_id == IL_INVALID_STATION) {
1982                 IL_ERR("Unable to prepare station %pM for addition\n", addr);
1983                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
1984                 return -EINVAL;
1985         }
1986
1987         /*
1988          * uCode is not able to deal with multiple requests to add a
1989          * station. Keep track if one is in progress so that we do not send
1990          * another.
1991          */
1992         if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
1993                 D_INFO("STA %d already in process of being added.\n", sta_id);
1994                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
1995                 return -EEXIST;
1996         }
1997
1998         if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
1999             (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
2000                 D_ASSOC("STA %d (%pM) already added, not adding again.\n",
2001                         sta_id, addr);
2002                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2003                 return -EEXIST;
2004         }
2005
2006         il->stations[sta_id].used |= IL_STA_UCODE_INPROGRESS;
2007         memcpy(&sta_cmd, &il->stations[sta_id].sta,
2008                sizeof(struct il_addsta_cmd));
2009         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2010
2011         /* Add station to device's station table */
2012         ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
2013         if (ret) {
2014                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2015                 IL_ERR("Adding station %pM failed.\n",
2016                        il->stations[sta_id].sta.sta.addr);
2017                 il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
2018                 il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
2019                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2020         }
2021         *sta_id_r = sta_id;
2022         return ret;
2023 }
2024 EXPORT_SYMBOL(il_add_station_common);
2025
2026 /**
2027  * il_sta_ucode_deactivate - deactivate ucode status for a station
2028  *
2029  * il->sta_lock must be held
2030  */
2031 static void
2032 il_sta_ucode_deactivate(struct il_priv *il, u8 sta_id)
2033 {
2034         /* Ucode must be active and driver must be non active */
2035         if ((il->stations[sta_id].
2036              used & (IL_STA_UCODE_ACTIVE | IL_STA_DRIVER_ACTIVE)) !=
2037             IL_STA_UCODE_ACTIVE)
2038                 IL_ERR("removed non active STA %u\n", sta_id);
2039
2040         il->stations[sta_id].used &= ~IL_STA_UCODE_ACTIVE;
2041
2042         memset(&il->stations[sta_id], 0, sizeof(struct il_station_entry));
2043         D_ASSOC("Removed STA %u\n", sta_id);
2044 }
2045
2046 static int
2047 il_send_remove_station(struct il_priv *il, const u8 * addr, int sta_id,
2048                        bool temporary)
2049 {
2050         struct il_rx_pkt *pkt;
2051         int ret;
2052
2053         unsigned long flags_spin;
2054         struct il_rem_sta_cmd rm_sta_cmd;
2055
2056         struct il_host_cmd cmd = {
2057                 .id = C_REM_STA,
2058                 .len = sizeof(struct il_rem_sta_cmd),
2059                 .flags = CMD_SYNC,
2060                 .data = &rm_sta_cmd,
2061         };
2062
2063         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
2064         rm_sta_cmd.num_sta = 1;
2065         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
2066
2067         cmd.flags |= CMD_WANT_SKB;
2068
2069         ret = il_send_cmd(il, &cmd);
2070
2071         if (ret)
2072                 return ret;
2073
2074         pkt = (struct il_rx_pkt *)cmd.reply_page;
2075         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
2076                 IL_ERR("Bad return from C_REM_STA (0x%08X)\n", pkt->hdr.flags);
2077                 ret = -EIO;
2078         }
2079
2080         if (!ret) {
2081                 switch (pkt->u.rem_sta.status) {
2082                 case REM_STA_SUCCESS_MSK:
2083                         if (!temporary) {
2084                                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2085                                 il_sta_ucode_deactivate(il, sta_id);
2086                                 spin_unlock_irqrestore(&il->sta_lock,
2087                                                        flags_spin);
2088                         }
2089                         D_ASSOC("C_REM_STA PASSED\n");
2090                         break;
2091                 default:
2092                         ret = -EIO;
2093                         IL_ERR("C_REM_STA failed\n");
2094                         break;
2095                 }
2096         }
2097         il_free_pages(il, cmd.reply_page);
2098
2099         return ret;
2100 }
2101
2102 /**
2103  * il_remove_station - Remove driver's knowledge of station.
2104  */
2105 int
2106 il_remove_station(struct il_priv *il, const u8 sta_id, const u8 * addr)
2107 {
2108         unsigned long flags;
2109
2110         if (!il_is_ready(il)) {
2111                 D_INFO("Unable to remove station %pM, device not ready.\n",
2112                        addr);
2113                 /*
2114                  * It is typical for stations to be removed when we are
2115                  * going down. Return success since device will be down
2116                  * soon anyway
2117                  */
2118                 return 0;
2119         }
2120
2121         D_ASSOC("Removing STA from driver:%d  %pM\n", sta_id, addr);
2122
2123         if (WARN_ON(sta_id == IL_INVALID_STATION))
2124                 return -EINVAL;
2125
2126         spin_lock_irqsave(&il->sta_lock, flags);
2127
2128         if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE)) {
2129                 D_INFO("Removing %pM but non DRIVER active\n", addr);
2130                 goto out_err;
2131         }
2132
2133         if (!(il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
2134                 D_INFO("Removing %pM but non UCODE active\n", addr);
2135                 goto out_err;
2136         }
2137
2138         if (il->stations[sta_id].used & IL_STA_LOCAL) {
2139                 kfree(il->stations[sta_id].lq);
2140                 il->stations[sta_id].lq = NULL;
2141         }
2142
2143         il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
2144
2145         il->num_stations--;
2146
2147         BUG_ON(il->num_stations < 0);
2148
2149         spin_unlock_irqrestore(&il->sta_lock, flags);
2150
2151         return il_send_remove_station(il, addr, sta_id, false);
2152 out_err:
2153         spin_unlock_irqrestore(&il->sta_lock, flags);
2154         return -EINVAL;
2155 }
2156 EXPORT_SYMBOL_GPL(il_remove_station);
2157
2158 /**
2159  * il_clear_ucode_stations - clear ucode station table bits
2160  *
2161  * This function clears all the bits in the driver indicating
2162  * which stations are active in the ucode. Call when something
2163  * other than explicit station management would cause this in
2164  * the ucode, e.g. unassociated RXON.
2165  */
2166 void
2167 il_clear_ucode_stations(struct il_priv *il)
2168 {
2169         int i;
2170         unsigned long flags_spin;
2171         bool cleared = false;
2172
2173         D_INFO("Clearing ucode stations in driver\n");
2174
2175         spin_lock_irqsave(&il->sta_lock, flags_spin);
2176         for (i = 0; i < il->hw_params.max_stations; i++) {
2177                 if (il->stations[i].used & IL_STA_UCODE_ACTIVE) {
2178                         D_INFO("Clearing ucode active for station %d\n", i);
2179                         il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
2180                         cleared = true;
2181                 }
2182         }
2183         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2184
2185         if (!cleared)
2186                 D_INFO("No active stations found to be cleared\n");
2187 }
2188 EXPORT_SYMBOL(il_clear_ucode_stations);
2189
2190 /**
2191  * il_restore_stations() - Restore driver known stations to device
2192  *
2193  * All stations considered active by driver, but not present in ucode, is
2194  * restored.
2195  *
2196  * Function sleeps.
2197  */
2198 void
2199 il_restore_stations(struct il_priv *il)
2200 {
2201         struct il_addsta_cmd sta_cmd;
2202         struct il_link_quality_cmd lq;
2203         unsigned long flags_spin;
2204         int i;
2205         bool found = false;
2206         int ret;
2207         bool send_lq;
2208
2209         if (!il_is_ready(il)) {
2210                 D_INFO("Not ready yet, not restoring any stations.\n");
2211                 return;
2212         }
2213
2214         D_ASSOC("Restoring all known stations ... start.\n");
2215         spin_lock_irqsave(&il->sta_lock, flags_spin);
2216         for (i = 0; i < il->hw_params.max_stations; i++) {
2217                 if ((il->stations[i].used & IL_STA_DRIVER_ACTIVE) &&
2218                     !(il->stations[i].used & IL_STA_UCODE_ACTIVE)) {
2219                         D_ASSOC("Restoring sta %pM\n",
2220                                 il->stations[i].sta.sta.addr);
2221                         il->stations[i].sta.mode = 0;
2222                         il->stations[i].used |= IL_STA_UCODE_INPROGRESS;
2223                         found = true;
2224                 }
2225         }
2226
2227         for (i = 0; i < il->hw_params.max_stations; i++) {
2228                 if ((il->stations[i].used & IL_STA_UCODE_INPROGRESS)) {
2229                         memcpy(&sta_cmd, &il->stations[i].sta,
2230                                sizeof(struct il_addsta_cmd));
2231                         send_lq = false;
2232                         if (il->stations[i].lq) {
2233                                 memcpy(&lq, il->stations[i].lq,
2234                                        sizeof(struct il_link_quality_cmd));
2235                                 send_lq = true;
2236                         }
2237                         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2238                         ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
2239                         if (ret) {
2240                                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2241                                 IL_ERR("Adding station %pM failed.\n",
2242                                        il->stations[i].sta.sta.addr);
2243                                 il->stations[i].used &= ~IL_STA_DRIVER_ACTIVE;
2244                                 il->stations[i].used &=
2245                                     ~IL_STA_UCODE_INPROGRESS;
2246                                 spin_unlock_irqrestore(&il->sta_lock,
2247                                                        flags_spin);
2248                         }
2249                         /*
2250                          * Rate scaling has already been initialized, send
2251                          * current LQ command
2252                          */
2253                         if (send_lq)
2254                                 il_send_lq_cmd(il, &lq, CMD_SYNC, true);
2255                         spin_lock_irqsave(&il->sta_lock, flags_spin);
2256                         il->stations[i].used &= ~IL_STA_UCODE_INPROGRESS;
2257                 }
2258         }
2259
2260         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2261         if (!found)
2262                 D_INFO("Restoring all known stations"
2263                        " .... no stations to be restored.\n");
2264         else
2265                 D_INFO("Restoring all known stations" " .... complete.\n");
2266 }
2267 EXPORT_SYMBOL(il_restore_stations);
2268
2269 int
2270 il_get_free_ucode_key_idx(struct il_priv *il)
2271 {
2272         int i;
2273
2274         for (i = 0; i < il->sta_key_max_num; i++)
2275                 if (!test_and_set_bit(i, &il->ucode_key_table))
2276                         return i;
2277
2278         return WEP_INVALID_OFFSET;
2279 }
2280 EXPORT_SYMBOL(il_get_free_ucode_key_idx);
2281
2282 void
2283 il_dealloc_bcast_stations(struct il_priv *il)
2284 {
2285         unsigned long flags;
2286         int i;
2287
2288         spin_lock_irqsave(&il->sta_lock, flags);
2289         for (i = 0; i < il->hw_params.max_stations; i++) {
2290                 if (!(il->stations[i].used & IL_STA_BCAST))
2291                         continue;
2292
2293                 il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
2294                 il->num_stations--;
2295                 BUG_ON(il->num_stations < 0);
2296                 kfree(il->stations[i].lq);
2297                 il->stations[i].lq = NULL;
2298         }
2299         spin_unlock_irqrestore(&il->sta_lock, flags);
2300 }
2301 EXPORT_SYMBOL_GPL(il_dealloc_bcast_stations);
2302
2303 #ifdef CONFIG_IWLEGACY_DEBUG
2304 static void
2305 il_dump_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq)
2306 {
2307         int i;
2308         D_RATE("lq station id 0x%x\n", lq->sta_id);
2309         D_RATE("lq ant 0x%X 0x%X\n", lq->general_params.single_stream_ant_msk,
2310                lq->general_params.dual_stream_ant_msk);
2311
2312         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2313                 D_RATE("lq idx %d 0x%X\n", i, lq->rs_table[i].rate_n_flags);
2314 }
2315 #else
2316 static inline void
2317 il_dump_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq)
2318 {
2319 }
2320 #endif
2321
2322 /**
2323  * il_is_lq_table_valid() - Test one aspect of LQ cmd for validity
2324  *
2325  * It sometimes happens when a HT rate has been in use and we
2326  * loose connectivity with AP then mac80211 will first tell us that the
2327  * current channel is not HT anymore before removing the station. In such a
2328  * scenario the RXON flags will be updated to indicate we are not
2329  * communicating HT anymore, but the LQ command may still contain HT rates.
2330  * Test for this to prevent driver from sending LQ command between the time
2331  * RXON flags are updated and when LQ command is updated.
2332  */
2333 static bool
2334 il_is_lq_table_valid(struct il_priv *il, struct il_link_quality_cmd *lq)
2335 {
2336         int i;
2337
2338         if (il->ht.enabled)
2339                 return true;
2340
2341         D_INFO("Channel %u is not an HT channel\n", il->active.channel);
2342         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2343                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
2344                         D_INFO("idx %d of LQ expects HT channel\n", i);
2345                         return false;
2346                 }
2347         }
2348         return true;
2349 }
2350
2351 /**
2352  * il_send_lq_cmd() - Send link quality command
2353  * @init: This command is sent as part of station initialization right
2354  *        after station has been added.
2355  *
2356  * The link quality command is sent as the last step of station creation.
2357  * This is the special case in which init is set and we call a callback in
2358  * this case to clear the state indicating that station creation is in
2359  * progress.
2360  */
2361 int
2362 il_send_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq,
2363                u8 flags, bool init)
2364 {
2365         int ret = 0;
2366         unsigned long flags_spin;
2367
2368         struct il_host_cmd cmd = {
2369                 .id = C_TX_LINK_QUALITY_CMD,
2370                 .len = sizeof(struct il_link_quality_cmd),
2371                 .flags = flags,
2372                 .data = lq,
2373         };
2374
2375         if (WARN_ON(lq->sta_id == IL_INVALID_STATION))
2376                 return -EINVAL;
2377
2378         spin_lock_irqsave(&il->sta_lock, flags_spin);
2379         if (!(il->stations[lq->sta_id].used & IL_STA_DRIVER_ACTIVE)) {
2380                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2381                 return -EINVAL;
2382         }
2383         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2384
2385         il_dump_lq_cmd(il, lq);
2386         BUG_ON(init && (cmd.flags & CMD_ASYNC));
2387
2388         if (il_is_lq_table_valid(il, lq))
2389                 ret = il_send_cmd(il, &cmd);
2390         else
2391                 ret = -EINVAL;
2392
2393         if (cmd.flags & CMD_ASYNC)
2394                 return ret;
2395
2396         if (init) {
2397                 D_INFO("init LQ command complete,"
2398                        " clearing sta addition status for sta %d\n",
2399                        lq->sta_id);
2400                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2401                 il->stations[lq->sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
2402                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2403         }
2404         return ret;
2405 }
2406 EXPORT_SYMBOL(il_send_lq_cmd);
2407
2408 int
2409 il_mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2410                   struct ieee80211_sta *sta)
2411 {
2412         struct il_priv *il = hw->priv;
2413         struct il_station_priv_common *sta_common = (void *)sta->drv_priv;
2414         int ret;
2415
2416         mutex_lock(&il->mutex);
2417         D_MAC80211("enter station %pM\n", sta->addr);
2418
2419         ret = il_remove_station(il, sta_common->sta_id, sta->addr);
2420         if (ret)
2421                 IL_ERR("Error removing station %pM\n", sta->addr);
2422
2423         D_MAC80211("leave ret %d\n", ret);
2424         mutex_unlock(&il->mutex);
2425
2426         return ret;
2427 }
2428 EXPORT_SYMBOL(il_mac_sta_remove);
2429
2430 /************************** RX-FUNCTIONS ****************************/
2431 /*
2432  * Rx theory of operation
2433  *
2434  * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
2435  * each of which point to Receive Buffers to be filled by the NIC.  These get
2436  * used not only for Rx frames, but for any command response or notification
2437  * from the NIC.  The driver and NIC manage the Rx buffers by means
2438  * of idxes into the circular buffer.
2439  *
2440  * Rx Queue Indexes
2441  * The host/firmware share two idx registers for managing the Rx buffers.
2442  *
2443  * The READ idx maps to the first position that the firmware may be writing
2444  * to -- the driver can read up to (but not including) this position and get
2445  * good data.
2446  * The READ idx is managed by the firmware once the card is enabled.
2447  *
2448  * The WRITE idx maps to the last position the driver has read from -- the
2449  * position preceding WRITE is the last slot the firmware can place a packet.
2450  *
2451  * The queue is empty (no good data) if WRITE = READ - 1, and is full if
2452  * WRITE = READ.
2453  *
2454  * During initialization, the host sets up the READ queue position to the first
2455  * IDX position, and WRITE to the last (READ - 1 wrapped)
2456  *
2457  * When the firmware places a packet in a buffer, it will advance the READ idx
2458  * and fire the RX interrupt.  The driver can then query the READ idx and
2459  * process as many packets as possible, moving the WRITE idx forward as it
2460  * resets the Rx queue buffers with new memory.
2461  *
2462  * The management in the driver is as follows:
2463  * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
2464  *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
2465  *   to replenish the iwl->rxq->rx_free.
2466  * + In il_rx_replenish (scheduled) if 'processed' != 'read' then the
2467  *   iwl->rxq is replenished and the READ IDX is updated (updating the
2468  *   'processed' and 'read' driver idxes as well)
2469  * + A received packet is processed and handed to the kernel network stack,
2470  *   detached from the iwl->rxq.  The driver 'processed' idx is updated.
2471  * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
2472  *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
2473  *   IDX is not incremented and iwl->status(RX_STALLED) is set.  If there
2474  *   were enough free buffers and RX_STALLED is set it is cleared.
2475  *
2476  *
2477  * Driver sequence:
2478  *
2479  * il_rx_queue_alloc()   Allocates rx_free
2480  * il_rx_replenish()     Replenishes rx_free list from rx_used, and calls
2481  *                            il_rx_queue_restock
2482  * il_rx_queue_restock() Moves available buffers from rx_free into Rx
2483  *                            queue, updates firmware pointers, and updates
2484  *                            the WRITE idx.  If insufficient rx_free buffers
2485  *                            are available, schedules il_rx_replenish
2486  *
2487  * -- enable interrupts --
2488  * ISR - il_rx()         Detach il_rx_bufs from pool up to the
2489  *                            READ IDX, detaching the SKB from the pool.
2490  *                            Moves the packet buffer from queue to rx_used.
2491  *                            Calls il_rx_queue_restock to refill any empty
2492  *                            slots.
2493  * ...
2494  *
2495  */
2496
2497 /**
2498  * il_rx_queue_space - Return number of free slots available in queue.
2499  */
2500 int
2501 il_rx_queue_space(const struct il_rx_queue *q)
2502 {
2503         int s = q->read - q->write;
2504         if (s <= 0)
2505                 s += RX_QUEUE_SIZE;
2506         /* keep some buffer to not confuse full and empty queue */
2507         s -= 2;
2508         if (s < 0)
2509                 s = 0;
2510         return s;
2511 }
2512 EXPORT_SYMBOL(il_rx_queue_space);
2513
2514 /**
2515  * il_rx_queue_update_write_ptr - Update the write pointer for the RX queue
2516  */
2517 void
2518 il_rx_queue_update_write_ptr(struct il_priv *il, struct il_rx_queue *q)
2519 {
2520         unsigned long flags;
2521         u32 rx_wrt_ptr_reg = il->hw_params.rx_wrt_ptr_reg;
2522         u32 reg;
2523
2524         spin_lock_irqsave(&q->lock, flags);
2525
2526         if (q->need_update == 0)
2527                 goto exit_unlock;
2528
2529         /* If power-saving is in use, make sure device is awake */
2530         if (test_bit(S_POWER_PMI, &il->status)) {
2531                 reg = _il_rd(il, CSR_UCODE_DRV_GP1);
2532
2533                 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
2534                         D_INFO("Rx queue requesting wakeup," " GP1 = 0x%x\n",
2535                                reg);
2536                         il_set_bit(il, CSR_GP_CNTRL,
2537                                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
2538                         goto exit_unlock;
2539                 }
2540
2541                 q->write_actual = (q->write & ~0x7);
2542                 il_wr(il, rx_wrt_ptr_reg, q->write_actual);
2543
2544                 /* Else device is assumed to be awake */
2545         } else {
2546                 /* Device expects a multiple of 8 */
2547                 q->write_actual = (q->write & ~0x7);
2548                 il_wr(il, rx_wrt_ptr_reg, q->write_actual);
2549         }
2550
2551         q->need_update = 0;
2552
2553 exit_unlock:
2554         spin_unlock_irqrestore(&q->lock, flags);
2555 }
2556 EXPORT_SYMBOL(il_rx_queue_update_write_ptr);
2557
2558 int
2559 il_rx_queue_alloc(struct il_priv *il)
2560 {
2561         struct il_rx_queue *rxq = &il->rxq;
2562         struct device *dev = &il->pci_dev->dev;
2563         int i;
2564
2565         spin_lock_init(&rxq->lock);
2566         INIT_LIST_HEAD(&rxq->rx_free);
2567         INIT_LIST_HEAD(&rxq->rx_used);
2568
2569         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
2570         rxq->bd =
2571             dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->bd_dma,
2572                                GFP_KERNEL);
2573         if (!rxq->bd)
2574                 goto err_bd;
2575
2576         rxq->rb_stts =
2577             dma_alloc_coherent(dev, sizeof(struct il_rb_status),
2578                                &rxq->rb_stts_dma, GFP_KERNEL);
2579         if (!rxq->rb_stts)
2580                 goto err_rb;
2581
2582         /* Fill the rx_used queue with _all_ of the Rx buffers */
2583         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
2584                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
2585
2586         /* Set us so that we have processed and used all buffers, but have
2587          * not restocked the Rx queue with fresh buffers */
2588         rxq->read = rxq->write = 0;
2589         rxq->write_actual = 0;
2590         rxq->free_count = 0;
2591         rxq->need_update = 0;
2592         return 0;
2593
2594 err_rb:
2595         dma_free_coherent(&il->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
2596                           rxq->bd_dma);
2597 err_bd:
2598         return -ENOMEM;
2599 }
2600 EXPORT_SYMBOL(il_rx_queue_alloc);
2601
2602 void
2603 il_hdl_spectrum_measurement(struct il_priv *il, struct il_rx_buf *rxb)
2604 {
2605         struct il_rx_pkt *pkt = rxb_addr(rxb);
2606         struct il_spectrum_notification *report = &(pkt->u.spectrum_notif);
2607
2608         if (!report->state) {
2609                 D_11H("Spectrum Measure Notification: Start\n");
2610                 return;
2611         }
2612
2613         memcpy(&il->measure_report, report, sizeof(*report));
2614         il->measurement_status |= MEASUREMENT_READY;
2615 }
2616 EXPORT_SYMBOL(il_hdl_spectrum_measurement);
2617
2618 /*
2619  * returns non-zero if packet should be dropped
2620  */
2621 int
2622 il_set_decrypted_flag(struct il_priv *il, struct ieee80211_hdr *hdr,
2623                       u32 decrypt_res, struct ieee80211_rx_status *stats)
2624 {
2625         u16 fc = le16_to_cpu(hdr->frame_control);
2626
2627         /*
2628          * All contexts have the same setting here due to it being
2629          * a module parameter, so OK to check any context.
2630          */
2631         if (il->active.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
2632                 return 0;
2633
2634         if (!(fc & IEEE80211_FCTL_PROTECTED))
2635                 return 0;
2636
2637         D_RX("decrypt_res:0x%x\n", decrypt_res);
2638         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
2639         case RX_RES_STATUS_SEC_TYPE_TKIP:
2640                 /* The uCode has got a bad phase 1 Key, pushes the packet.
2641                  * Decryption will be done in SW. */
2642                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
2643                     RX_RES_STATUS_BAD_KEY_TTAK)
2644                         break;
2645
2646         case RX_RES_STATUS_SEC_TYPE_WEP:
2647                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
2648                     RX_RES_STATUS_BAD_ICV_MIC) {
2649                         /* bad ICV, the packet is destroyed since the
2650                          * decryption is inplace, drop it */
2651                         D_RX("Packet destroyed\n");
2652                         return -1;
2653                 }
2654         case RX_RES_STATUS_SEC_TYPE_CCMP:
2655                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
2656                     RX_RES_STATUS_DECRYPT_OK) {
2657                         D_RX("hw decrypt successfully!!!\n");
2658                         stats->flag |= RX_FLAG_DECRYPTED;
2659                 }
2660                 break;
2661
2662         default:
2663                 break;
2664         }
2665         return 0;
2666 }
2667 EXPORT_SYMBOL(il_set_decrypted_flag);
2668
2669 /**
2670  * il_txq_update_write_ptr - Send new write idx to hardware
2671  */
2672 void
2673 il_txq_update_write_ptr(struct il_priv *il, struct il_tx_queue *txq)
2674 {
2675         u32 reg = 0;
2676         int txq_id = txq->q.id;
2677
2678         if (txq->need_update == 0)
2679                 return;
2680
2681         /* if we're trying to save power */
2682         if (test_bit(S_POWER_PMI, &il->status)) {
2683                 /* wake up nic if it's powered down ...
2684                  * uCode will wake up, and interrupt us again, so next
2685                  * time we'll skip this part. */
2686                 reg = _il_rd(il, CSR_UCODE_DRV_GP1);
2687
2688                 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
2689                         D_INFO("Tx queue %d requesting wakeup," " GP1 = 0x%x\n",
2690                                txq_id, reg);
2691                         il_set_bit(il, CSR_GP_CNTRL,
2692                                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
2693                         return;
2694                 }
2695
2696                 il_wr(il, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
2697
2698                 /*
2699                  * else not in power-save mode,
2700                  * uCode will never sleep when we're
2701                  * trying to tx (during RFKILL, we're not trying to tx).
2702                  */
2703         } else
2704                 _il_wr(il, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
2705         txq->need_update = 0;
2706 }
2707 EXPORT_SYMBOL(il_txq_update_write_ptr);
2708
2709 /**
2710  * il_tx_queue_unmap -  Unmap any remaining DMA mappings and free skb's
2711  */
2712 void
2713 il_tx_queue_unmap(struct il_priv *il, int txq_id)
2714 {
2715         struct il_tx_queue *txq = &il->txq[txq_id];
2716         struct il_queue *q = &txq->q;
2717
2718         if (q->n_bd == 0)
2719                 return;
2720
2721         while (q->write_ptr != q->read_ptr) {
2722                 il->ops->txq_free_tfd(il, txq);
2723                 q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
2724         }
2725 }
2726 EXPORT_SYMBOL(il_tx_queue_unmap);
2727
2728 /**
2729  * il_tx_queue_free - Deallocate DMA queue.
2730  * @txq: Transmit queue to deallocate.
2731  *
2732  * Empty queue by removing and destroying all BD's.
2733  * Free all buffers.
2734  * 0-fill, but do not free "txq" descriptor structure.
2735  */
2736 void
2737 il_tx_queue_free(struct il_priv *il, int txq_id)
2738 {
2739         struct il_tx_queue *txq = &il->txq[txq_id];
2740         struct device *dev = &il->pci_dev->dev;
2741         int i;
2742
2743         il_tx_queue_unmap(il, txq_id);
2744
2745         /* De-alloc array of command/tx buffers */
2746         for (i = 0; i < TFD_TX_CMD_SLOTS; i++)
2747                 kfree(txq->cmd[i]);
2748
2749         /* De-alloc circular buffer of TFDs */
2750         if (txq->q.n_bd)
2751                 dma_free_coherent(dev, il->hw_params.tfd_size * txq->q.n_bd,
2752                                   txq->tfds, txq->q.dma_addr);
2753
2754         /* De-alloc array of per-TFD driver data */
2755         kfree(txq->skbs);
2756         txq->skbs = NULL;
2757
2758         /* deallocate arrays */
2759         kfree(txq->cmd);
2760         kfree(txq->meta);
2761         txq->cmd = NULL;
2762         txq->meta = NULL;
2763
2764         /* 0-fill queue descriptor structure */
2765         memset(txq, 0, sizeof(*txq));
2766 }
2767 EXPORT_SYMBOL(il_tx_queue_free);
2768
2769 /**
2770  * il_cmd_queue_unmap - Unmap any remaining DMA mappings from command queue
2771  */
2772 void
2773 il_cmd_queue_unmap(struct il_priv *il)
2774 {
2775         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
2776         struct il_queue *q = &txq->q;
2777         int i;
2778
2779         if (q->n_bd == 0)
2780                 return;
2781
2782         while (q->read_ptr != q->write_ptr) {
2783                 i = il_get_cmd_idx(q, q->read_ptr, 0);
2784
2785                 if (txq->meta[i].flags & CMD_MAPPED) {
2786                         pci_unmap_single(il->pci_dev,
2787                                          dma_unmap_addr(&txq->meta[i], mapping),
2788                                          dma_unmap_len(&txq->meta[i], len),
2789                                          PCI_DMA_BIDIRECTIONAL);
2790                         txq->meta[i].flags = 0;
2791                 }
2792
2793                 q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
2794         }
2795
2796         i = q->n_win;
2797         if (txq->meta[i].flags & CMD_MAPPED) {
2798                 pci_unmap_single(il->pci_dev,
2799                                  dma_unmap_addr(&txq->meta[i], mapping),
2800                                  dma_unmap_len(&txq->meta[i], len),
2801                                  PCI_DMA_BIDIRECTIONAL);
2802                 txq->meta[i].flags = 0;
2803         }
2804 }
2805 EXPORT_SYMBOL(il_cmd_queue_unmap);
2806
2807 /**
2808  * il_cmd_queue_free - Deallocate DMA queue.
2809  * @txq: Transmit queue to deallocate.
2810  *
2811  * Empty queue by removing and destroying all BD's.
2812  * Free all buffers.
2813  * 0-fill, but do not free "txq" descriptor structure.
2814  */
2815 void
2816 il_cmd_queue_free(struct il_priv *il)
2817 {
2818         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
2819         struct device *dev = &il->pci_dev->dev;
2820         int i;
2821
2822         il_cmd_queue_unmap(il);
2823
2824         /* De-alloc array of command/tx buffers */
2825         for (i = 0; i <= TFD_CMD_SLOTS; i++)
2826                 kfree(txq->cmd[i]);
2827
2828         /* De-alloc circular buffer of TFDs */
2829         if (txq->q.n_bd)
2830                 dma_free_coherent(dev, il->hw_params.tfd_size * txq->q.n_bd,
2831                                   txq->tfds, txq->q.dma_addr);
2832
2833         /* deallocate arrays */
2834         kfree(txq->cmd);
2835         kfree(txq->meta);
2836         txq->cmd = NULL;
2837         txq->meta = NULL;
2838
2839         /* 0-fill queue descriptor structure */
2840         memset(txq, 0, sizeof(*txq));
2841 }
2842 EXPORT_SYMBOL(il_cmd_queue_free);
2843
2844 /*************** DMA-QUEUE-GENERAL-FUNCTIONS  *****
2845  * DMA services
2846  *
2847  * Theory of operation
2848  *
2849  * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
2850  * of buffer descriptors, each of which points to one or more data buffers for
2851  * the device to read from or fill.  Driver and device exchange status of each
2852  * queue via "read" and "write" pointers.  Driver keeps minimum of 2 empty
2853  * entries in each circular buffer, to protect against confusing empty and full
2854  * queue states.
2855  *
2856  * The device reads or writes the data in the queues via the device's several
2857  * DMA/FIFO channels.  Each queue is mapped to a single DMA channel.
2858  *
2859  * For Tx queue, there are low mark and high mark limits. If, after queuing
2860  * the packet for Tx, free space become < low mark, Tx queue stopped. When
2861  * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
2862  * Tx queue resumed.
2863  *
2864  * See more detailed info in 4965.h.
2865  ***************************************************/
2866
2867 int
2868 il_queue_space(const struct il_queue *q)
2869 {
2870         int s = q->read_ptr - q->write_ptr;
2871
2872         if (q->read_ptr > q->write_ptr)
2873                 s -= q->n_bd;
2874
2875         if (s <= 0)
2876                 s += q->n_win;
2877         /* keep some reserve to not confuse empty and full situations */
2878         s -= 2;
2879         if (s < 0)
2880                 s = 0;
2881         return s;
2882 }
2883 EXPORT_SYMBOL(il_queue_space);
2884
2885
2886 /**
2887  * il_queue_init - Initialize queue's high/low-water and read/write idxes
2888  */
2889 static int
2890 il_queue_init(struct il_priv *il, struct il_queue *q, int slots, u32 id)
2891 {
2892         /*
2893          * TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
2894          * il_queue_inc_wrap and il_queue_dec_wrap are broken.
2895          */
2896         BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
2897         /* FIXME: remove q->n_bd */
2898         q->n_bd = TFD_QUEUE_SIZE_MAX;
2899
2900         q->n_win = slots;
2901         q->id = id;
2902
2903         /* slots_must be power-of-two size, otherwise
2904          * il_get_cmd_idx is broken. */
2905         BUG_ON(!is_power_of_2(slots));
2906
2907         q->low_mark = q->n_win / 4;
2908         if (q->low_mark < 4)
2909                 q->low_mark = 4;
2910
2911         q->high_mark = q->n_win / 8;
2912         if (q->high_mark < 2)
2913                 q->high_mark = 2;
2914
2915         q->write_ptr = q->read_ptr = 0;
2916
2917         return 0;
2918 }
2919
2920 /**
2921  * il_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue
2922  */
2923 static int
2924 il_tx_queue_alloc(struct il_priv *il, struct il_tx_queue *txq, u32 id)
2925 {
2926         struct device *dev = &il->pci_dev->dev;
2927         size_t tfd_sz = il->hw_params.tfd_size * TFD_QUEUE_SIZE_MAX;
2928
2929         /* Driver ilate data, only for Tx (not command) queues,
2930          * not shared with device. */
2931         if (id != il->cmd_queue) {
2932                 txq->skbs = kcalloc(TFD_QUEUE_SIZE_MAX, sizeof(struct skb *),
2933                                     GFP_KERNEL);
2934                 if (!txq->skbs) {
2935                         IL_ERR("Fail to alloc skbs\n");
2936                         goto error;
2937                 }
2938         } else
2939                 txq->skbs = NULL;
2940
2941         /* Circular buffer of transmit frame descriptors (TFDs),
2942          * shared with device */
2943         txq->tfds =
2944             dma_alloc_coherent(dev, tfd_sz, &txq->q.dma_addr, GFP_KERNEL);
2945         if (!txq->tfds) {
2946                 IL_ERR("Fail to alloc TFDs\n");
2947                 goto error;
2948         }
2949         txq->q.id = id;
2950
2951         return 0;
2952
2953 error:
2954         kfree(txq->skbs);
2955         txq->skbs = NULL;
2956
2957         return -ENOMEM;
2958 }
2959
2960 /**
2961  * il_tx_queue_init - Allocate and initialize one tx/cmd queue
2962  */
2963 int
2964 il_tx_queue_init(struct il_priv *il, u32 txq_id)
2965 {
2966         int i, len, ret;
2967         int slots, actual_slots;
2968         struct il_tx_queue *txq = &il->txq[txq_id];
2969
2970         /*
2971          * Alloc buffer array for commands (Tx or other types of commands).
2972          * For the command queue (#4/#9), allocate command space + one big
2973          * command for scan, since scan command is very huge; the system will
2974          * not have two scans at the same time, so only one is needed.
2975          * For normal Tx queues (all other queues), no super-size command
2976          * space is needed.
2977          */
2978         if (txq_id == il->cmd_queue) {
2979                 slots = TFD_CMD_SLOTS;
2980                 actual_slots = slots + 1;
2981         } else {
2982                 slots = TFD_TX_CMD_SLOTS;
2983                 actual_slots = slots;
2984         }
2985
2986         txq->meta =
2987             kzalloc(sizeof(struct il_cmd_meta) * actual_slots, GFP_KERNEL);
2988         txq->cmd =
2989             kzalloc(sizeof(struct il_device_cmd *) * actual_slots, GFP_KERNEL);
2990
2991         if (!txq->meta || !txq->cmd)
2992                 goto out_free_arrays;
2993
2994         len = sizeof(struct il_device_cmd);
2995         for (i = 0; i < actual_slots; i++) {
2996                 /* only happens for cmd queue */
2997                 if (i == slots)
2998                         len = IL_MAX_CMD_SIZE;
2999
3000                 txq->cmd[i] = kmalloc(len, GFP_KERNEL);
3001                 if (!txq->cmd[i])
3002                         goto err;
3003         }
3004
3005         /* Alloc driver data array and TFD circular buffer */
3006         ret = il_tx_queue_alloc(il, txq, txq_id);
3007         if (ret)
3008                 goto err;
3009
3010         txq->need_update = 0;
3011
3012         /*
3013          * For the default queues 0-3, set up the swq_id
3014          * already -- all others need to get one later
3015          * (if they need one at all).
3016          */
3017         if (txq_id < 4)
3018                 il_set_swq_id(txq, txq_id, txq_id);
3019
3020         /* Initialize queue's high/low-water marks, and head/tail idxes */
3021         il_queue_init(il, &txq->q, slots, txq_id);
3022
3023         /* Tell device where to find queue */
3024         il->ops->txq_init(il, txq);
3025
3026         return 0;
3027 err:
3028         for (i = 0; i < actual_slots; i++)
3029                 kfree(txq->cmd[i]);
3030 out_free_arrays:
3031         kfree(txq->meta);
3032         kfree(txq->cmd);
3033
3034         return -ENOMEM;
3035 }
3036 EXPORT_SYMBOL(il_tx_queue_init);
3037
3038 void
3039 il_tx_queue_reset(struct il_priv *il, u32 txq_id)
3040 {
3041         int slots, actual_slots;
3042         struct il_tx_queue *txq = &il->txq[txq_id];
3043
3044         if (txq_id == il->cmd_queue) {
3045                 slots = TFD_CMD_SLOTS;
3046                 actual_slots = TFD_CMD_SLOTS + 1;
3047         } else {
3048                 slots = TFD_TX_CMD_SLOTS;
3049                 actual_slots = TFD_TX_CMD_SLOTS;
3050         }
3051
3052         memset(txq->meta, 0, sizeof(struct il_cmd_meta) * actual_slots);
3053         txq->need_update = 0;
3054
3055         /* Initialize queue's high/low-water marks, and head/tail idxes */
3056         il_queue_init(il, &txq->q, slots, txq_id);
3057
3058         /* Tell device where to find queue */
3059         il->ops->txq_init(il, txq);
3060 }
3061 EXPORT_SYMBOL(il_tx_queue_reset);
3062
3063 /*************** HOST COMMAND QUEUE FUNCTIONS   *****/
3064
3065 /**
3066  * il_enqueue_hcmd - enqueue a uCode command
3067  * @il: device ilate data point
3068  * @cmd: a point to the ucode command structure
3069  *
3070  * The function returns < 0 values to indicate the operation is
3071  * failed. On success, it turns the idx (> 0) of command in the
3072  * command queue.
3073  */
3074 int
3075 il_enqueue_hcmd(struct il_priv *il, struct il_host_cmd *cmd)
3076 {
3077         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
3078         struct il_queue *q = &txq->q;
3079         struct il_device_cmd *out_cmd;
3080         struct il_cmd_meta *out_meta;
3081         dma_addr_t phys_addr;
3082         unsigned long flags;
3083         int len;
3084         u32 idx;
3085         u16 fix_size;
3086
3087         cmd->len = il->ops->get_hcmd_size(cmd->id, cmd->len);
3088         fix_size = (u16) (cmd->len + sizeof(out_cmd->hdr));
3089
3090         /* If any of the command structures end up being larger than
3091          * the TFD_MAX_PAYLOAD_SIZE, and it sent as a 'small' command then
3092          * we will need to increase the size of the TFD entries
3093          * Also, check to see if command buffer should not exceed the size
3094          * of device_cmd and max_cmd_size. */
3095         BUG_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) &&
3096                !(cmd->flags & CMD_SIZE_HUGE));
3097         BUG_ON(fix_size > IL_MAX_CMD_SIZE);
3098
3099         if (il_is_rfkill(il) || il_is_ctkill(il)) {
3100                 IL_WARN("Not sending command - %s KILL\n",
3101                         il_is_rfkill(il) ? "RF" : "CT");
3102                 return -EIO;
3103         }
3104
3105         spin_lock_irqsave(&il->hcmd_lock, flags);
3106
3107         if (il_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
3108                 spin_unlock_irqrestore(&il->hcmd_lock, flags);
3109
3110                 IL_ERR("Restarting adapter due to command queue full\n");
3111                 queue_work(il->workqueue, &il->restart);
3112                 return -ENOSPC;
3113         }
3114
3115         idx = il_get_cmd_idx(q, q->write_ptr, cmd->flags & CMD_SIZE_HUGE);
3116         out_cmd = txq->cmd[idx];
3117         out_meta = &txq->meta[idx];
3118
3119         if (WARN_ON(out_meta->flags & CMD_MAPPED)) {
3120                 spin_unlock_irqrestore(&il->hcmd_lock, flags);
3121                 return -ENOSPC;
3122         }
3123
3124         memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
3125         out_meta->flags = cmd->flags | CMD_MAPPED;
3126         if (cmd->flags & CMD_WANT_SKB)
3127                 out_meta->source = cmd;
3128         if (cmd->flags & CMD_ASYNC)
3129                 out_meta->callback = cmd->callback;
3130
3131         out_cmd->hdr.cmd = cmd->id;
3132         memcpy(&out_cmd->cmd.payload, cmd->data, cmd->len);
3133
3134         /* At this point, the out_cmd now has all of the incoming cmd
3135          * information */
3136
3137         out_cmd->hdr.flags = 0;
3138         out_cmd->hdr.sequence =
3139             cpu_to_le16(QUEUE_TO_SEQ(il->cmd_queue) | IDX_TO_SEQ(q->write_ptr));
3140         if (cmd->flags & CMD_SIZE_HUGE)
3141                 out_cmd->hdr.sequence |= SEQ_HUGE_FRAME;
3142         len = sizeof(struct il_device_cmd);
3143         if (idx == TFD_CMD_SLOTS)
3144                 len = IL_MAX_CMD_SIZE;
3145
3146 #ifdef CONFIG_IWLEGACY_DEBUG
3147         switch (out_cmd->hdr.cmd) {
3148         case C_TX_LINK_QUALITY_CMD:
3149         case C_SENSITIVITY:
3150                 D_HC_DUMP("Sending command %s (#%x), seq: 0x%04X, "
3151                           "%d bytes at %d[%d]:%d\n",
3152                           il_get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd,
3153                           le16_to_cpu(out_cmd->hdr.sequence), fix_size,
3154                           q->write_ptr, idx, il->cmd_queue);
3155                 break;
3156         default:
3157                 D_HC("Sending command %s (#%x), seq: 0x%04X, "
3158                      "%d bytes at %d[%d]:%d\n",
3159                      il_get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd,
3160                      le16_to_cpu(out_cmd->hdr.sequence), fix_size, q->write_ptr,
3161                      idx, il->cmd_queue);
3162         }
3163 #endif
3164         txq->need_update = 1;
3165
3166         if (il->ops->txq_update_byte_cnt_tbl)
3167                 /* Set up entry in queue's byte count circular buffer */
3168                 il->ops->txq_update_byte_cnt_tbl(il, txq, 0);
3169
3170         phys_addr =
3171             pci_map_single(il->pci_dev, &out_cmd->hdr, fix_size,
3172                            PCI_DMA_BIDIRECTIONAL);
3173         dma_unmap_addr_set(out_meta, mapping, phys_addr);
3174         dma_unmap_len_set(out_meta, len, fix_size);
3175
3176         il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, fix_size, 1,
3177                                             U32_PAD(cmd->len));
3178
3179         /* Increment and update queue's write idx */
3180         q->write_ptr = il_queue_inc_wrap(q->write_ptr, q->n_bd);
3181         il_txq_update_write_ptr(il, txq);
3182
3183         spin_unlock_irqrestore(&il->hcmd_lock, flags);
3184         return idx;
3185 }
3186
3187 /**
3188  * il_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd
3189  *
3190  * When FW advances 'R' idx, all entries between old and new 'R' idx
3191  * need to be reclaimed. As result, some free space forms.  If there is
3192  * enough free space (> low mark), wake the stack that feeds us.
3193  */
3194 static void
3195 il_hcmd_queue_reclaim(struct il_priv *il, int txq_id, int idx, int cmd_idx)
3196 {
3197         struct il_tx_queue *txq = &il->txq[txq_id];
3198         struct il_queue *q = &txq->q;
3199         int nfreed = 0;
3200
3201         if (idx >= q->n_bd || il_queue_used(q, idx) == 0) {
3202                 IL_ERR("Read idx for DMA queue txq id (%d), idx %d, "
3203                        "is out of range [0-%d] %d %d.\n", txq_id, idx, q->n_bd,
3204                        q->write_ptr, q->read_ptr);
3205                 return;
3206         }
3207
3208         for (idx = il_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
3209              q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd)) {
3210
3211                 if (nfreed++ > 0) {
3212                         IL_ERR("HCMD skipped: idx (%d) %d %d\n", idx,
3213                                q->write_ptr, q->read_ptr);
3214                         queue_work(il->workqueue, &il->restart);
3215                 }
3216
3217         }
3218 }
3219
3220 /**
3221  * il_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
3222  * @rxb: Rx buffer to reclaim
3223  *
3224  * If an Rx buffer has an async callback associated with it the callback
3225  * will be executed.  The attached skb (if present) will only be freed
3226  * if the callback returns 1
3227  */
3228 void
3229 il_tx_cmd_complete(struct il_priv *il, struct il_rx_buf *rxb)
3230 {
3231         struct il_rx_pkt *pkt = rxb_addr(rxb);
3232         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
3233         int txq_id = SEQ_TO_QUEUE(sequence);
3234         int idx = SEQ_TO_IDX(sequence);
3235         int cmd_idx;
3236         bool huge = !!(pkt->hdr.sequence & SEQ_HUGE_FRAME);
3237         struct il_device_cmd *cmd;
3238         struct il_cmd_meta *meta;
3239         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
3240         unsigned long flags;
3241
3242         /* If a Tx command is being handled and it isn't in the actual
3243          * command queue then there a command routing bug has been introduced
3244          * in the queue management code. */
3245         if (WARN
3246             (txq_id != il->cmd_queue,
3247              "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
3248              txq_id, il->cmd_queue, sequence, il->txq[il->cmd_queue].q.read_ptr,
3249              il->txq[il->cmd_queue].q.write_ptr)) {
3250                 il_print_hex_error(il, pkt, 32);
3251                 return;
3252         }
3253
3254         cmd_idx = il_get_cmd_idx(&txq->q, idx, huge);
3255         cmd = txq->cmd[cmd_idx];
3256         meta = &txq->meta[cmd_idx];
3257
3258         txq->time_stamp = jiffies;
3259
3260         pci_unmap_single(il->pci_dev, dma_unmap_addr(meta, mapping),
3261                          dma_unmap_len(meta, len), PCI_DMA_BIDIRECTIONAL);
3262
3263         /* Input error checking is done when commands are added to queue. */
3264         if (meta->flags & CMD_WANT_SKB) {
3265                 meta->source->reply_page = (unsigned long)rxb_addr(rxb);
3266                 rxb->page = NULL;
3267         } else if (meta->callback)
3268                 meta->callback(il, cmd, pkt);
3269
3270         spin_lock_irqsave(&il->hcmd_lock, flags);
3271
3272         il_hcmd_queue_reclaim(il, txq_id, idx, cmd_idx);
3273
3274         if (!(meta->flags & CMD_ASYNC)) {
3275                 clear_bit(S_HCMD_ACTIVE, &il->status);
3276                 D_INFO("Clearing HCMD_ACTIVE for command %s\n",
3277                        il_get_cmd_string(cmd->hdr.cmd));
3278                 wake_up(&il->wait_command_queue);
3279         }
3280
3281         /* Mark as unmapped */
3282         meta->flags = 0;
3283
3284         spin_unlock_irqrestore(&il->hcmd_lock, flags);
3285 }
3286 EXPORT_SYMBOL(il_tx_cmd_complete);
3287
3288 MODULE_DESCRIPTION("iwl-legacy: common functions for 3945 and 4965");
3289 MODULE_VERSION(IWLWIFI_VERSION);
3290 MODULE_AUTHOR(DRV_COPYRIGHT " " DRV_AUTHOR);
3291 MODULE_LICENSE("GPL");
3292
3293 /*
3294  * set bt_coex_active to true, uCode will do kill/defer
3295  * every time the priority line is asserted (BT is sending signals on the
3296  * priority line in the PCIx).
3297  * set bt_coex_active to false, uCode will ignore the BT activity and
3298  * perform the normal operation
3299  *
3300  * User might experience transmit issue on some platform due to WiFi/BT
3301  * co-exist problem. The possible behaviors are:
3302  *   Able to scan and finding all the available AP
3303  *   Not able to associate with any AP
3304  * On those platforms, WiFi communication can be restored by set
3305  * "bt_coex_active" module parameter to "false"
3306  *
3307  * default: bt_coex_active = true (BT_COEX_ENABLE)
3308  */
3309 static bool bt_coex_active = true;
3310 module_param(bt_coex_active, bool, S_IRUGO);
3311 MODULE_PARM_DESC(bt_coex_active, "enable wifi/bluetooth co-exist");
3312
3313 u32 il_debug_level;
3314 EXPORT_SYMBOL(il_debug_level);
3315
3316 const u8 il_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
3317 EXPORT_SYMBOL(il_bcast_addr);
3318
3319 #define MAX_BIT_RATE_40_MHZ 150 /* Mbps */
3320 #define MAX_BIT_RATE_20_MHZ 72  /* Mbps */
3321 static void
3322 il_init_ht_hw_capab(const struct il_priv *il,
3323                     struct ieee80211_sta_ht_cap *ht_info,
3324                     enum ieee80211_band band)
3325 {
3326         u16 max_bit_rate = 0;
3327         u8 rx_chains_num = il->hw_params.rx_chains_num;
3328         u8 tx_chains_num = il->hw_params.tx_chains_num;
3329
3330         ht_info->cap = 0;
3331         memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
3332
3333         ht_info->ht_supported = true;
3334
3335         ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
3336         max_bit_rate = MAX_BIT_RATE_20_MHZ;
3337         if (il->hw_params.ht40_channel & BIT(band)) {
3338                 ht_info->cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
3339                 ht_info->cap |= IEEE80211_HT_CAP_SGI_40;
3340                 ht_info->mcs.rx_mask[4] = 0x01;
3341                 max_bit_rate = MAX_BIT_RATE_40_MHZ;
3342         }
3343
3344         if (il->cfg->mod_params->amsdu_size_8K)
3345                 ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;
3346
3347         ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
3348         ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;
3349
3350         ht_info->mcs.rx_mask[0] = 0xFF;
3351         if (rx_chains_num >= 2)
3352                 ht_info->mcs.rx_mask[1] = 0xFF;
3353         if (rx_chains_num >= 3)
3354                 ht_info->mcs.rx_mask[2] = 0xFF;
3355
3356         /* Highest supported Rx data rate */
3357         max_bit_rate *= rx_chains_num;
3358         WARN_ON(max_bit_rate & ~IEEE80211_HT_MCS_RX_HIGHEST_MASK);
3359         ht_info->mcs.rx_highest = cpu_to_le16(max_bit_rate);
3360
3361         /* Tx MCS capabilities */
3362         ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
3363         if (tx_chains_num != rx_chains_num) {
3364                 ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
3365                 ht_info->mcs.tx_params |=
3366                     ((tx_chains_num -
3367                       1) << IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
3368         }
3369 }
3370
3371 /**
3372  * il_init_geos - Initialize mac80211's geo/channel info based from eeprom
3373  */
3374 int
3375 il_init_geos(struct il_priv *il)
3376 {
3377         struct il_channel_info *ch;
3378         struct ieee80211_supported_band *sband;
3379         struct ieee80211_channel *channels;
3380         struct ieee80211_channel *geo_ch;
3381         struct ieee80211_rate *rates;
3382         int i = 0;
3383         s8 max_tx_power = 0;
3384
3385         if (il->bands[IEEE80211_BAND_2GHZ].n_bitrates ||
3386             il->bands[IEEE80211_BAND_5GHZ].n_bitrates) {
3387                 D_INFO("Geography modes already initialized.\n");
3388                 set_bit(S_GEO_CONFIGURED, &il->status);
3389                 return 0;
3390         }
3391
3392         channels =
3393             kzalloc(sizeof(struct ieee80211_channel) * il->channel_count,
3394                     GFP_KERNEL);
3395         if (!channels)
3396                 return -ENOMEM;
3397
3398         rates =
3399             kzalloc((sizeof(struct ieee80211_rate) * RATE_COUNT_LEGACY),
3400                     GFP_KERNEL);
3401         if (!rates) {
3402                 kfree(channels);
3403                 return -ENOMEM;
3404         }
3405
3406         /* 5.2GHz channels start after the 2.4GHz channels */
3407         sband = &il->bands[IEEE80211_BAND_5GHZ];
3408         sband->channels = &channels[ARRAY_SIZE(il_eeprom_band_1)];
3409         /* just OFDM */
3410         sband->bitrates = &rates[IL_FIRST_OFDM_RATE];
3411         sband->n_bitrates = RATE_COUNT_LEGACY - IL_FIRST_OFDM_RATE;
3412
3413         if (il->cfg->sku & IL_SKU_N)
3414                 il_init_ht_hw_capab(il, &sband->ht_cap, IEEE80211_BAND_5GHZ);
3415
3416         sband = &il->bands[IEEE80211_BAND_2GHZ];
3417         sband->channels = channels;
3418         /* OFDM & CCK */
3419         sband->bitrates = rates;
3420         sband->n_bitrates = RATE_COUNT_LEGACY;
3421
3422         if (il->cfg->sku & IL_SKU_N)
3423                 il_init_ht_hw_capab(il, &sband->ht_cap, IEEE80211_BAND_2GHZ);
3424
3425         il->ieee_channels = channels;
3426         il->ieee_rates = rates;
3427
3428         for (i = 0; i < il->channel_count; i++) {
3429                 ch = &il->channel_info[i];
3430
3431                 if (!il_is_channel_valid(ch))
3432                         continue;
3433
3434                 sband = &il->bands[ch->band];
3435
3436                 geo_ch = &sband->channels[sband->n_channels++];
3437
3438                 geo_ch->center_freq =
3439                     ieee80211_channel_to_frequency(ch->channel, ch->band);
3440                 geo_ch->max_power = ch->max_power_avg;
3441                 geo_ch->max_antenna_gain = 0xff;
3442                 geo_ch->hw_value = ch->channel;
3443
3444                 if (il_is_channel_valid(ch)) {
3445                         if (!(ch->flags & EEPROM_CHANNEL_IBSS))
3446                                 geo_ch->flags |= IEEE80211_CHAN_NO_IBSS;
3447
3448                         if (!(ch->flags & EEPROM_CHANNEL_ACTIVE))
3449                                 geo_ch->flags |= IEEE80211_CHAN_PASSIVE_SCAN;
3450
3451                         if (ch->flags & EEPROM_CHANNEL_RADAR)
3452                                 geo_ch->flags |= IEEE80211_CHAN_RADAR;
3453
3454                         geo_ch->flags |= ch->ht40_extension_channel;
3455
3456                         if (ch->max_power_avg > max_tx_power)
3457                                 max_tx_power = ch->max_power_avg;
3458                 } else {
3459                         geo_ch->flags |= IEEE80211_CHAN_DISABLED;
3460                 }
3461
3462                 D_INFO("Channel %d Freq=%d[%sGHz] %s flag=0x%X\n", ch->channel,
3463                        geo_ch->center_freq,
3464                        il_is_channel_a_band(ch) ? "5.2" : "2.4",
3465                        geo_ch->
3466                        flags & IEEE80211_CHAN_DISABLED ? "restricted" : "valid",
3467                        geo_ch->flags);
3468         }
3469
3470         il->tx_power_device_lmt = max_tx_power;
3471         il->tx_power_user_lmt = max_tx_power;
3472         il->tx_power_next = max_tx_power;
3473
3474         if (il->bands[IEEE80211_BAND_5GHZ].n_channels == 0 &&
3475             (il->cfg->sku & IL_SKU_A)) {
3476                 IL_INFO("Incorrectly detected BG card as ABG. "
3477                         "Please send your PCI ID 0x%04X:0x%04X to maintainer.\n",
3478                         il->pci_dev->device, il->pci_dev->subsystem_device);
3479                 il->cfg->sku &= ~IL_SKU_A;
3480         }
3481
3482         IL_INFO("Tunable channels: %d 802.11bg, %d 802.11a channels\n",
3483                 il->bands[IEEE80211_BAND_2GHZ].n_channels,
3484                 il->bands[IEEE80211_BAND_5GHZ].n_channels);
3485
3486         set_bit(S_GEO_CONFIGURED, &il->status);
3487
3488         return 0;
3489 }
3490 EXPORT_SYMBOL(il_init_geos);
3491
3492 /*
3493  * il_free_geos - undo allocations in il_init_geos
3494  */
3495 void
3496 il_free_geos(struct il_priv *il)
3497 {
3498         kfree(il->ieee_channels);
3499         kfree(il->ieee_rates);
3500         clear_bit(S_GEO_CONFIGURED, &il->status);
3501 }
3502 EXPORT_SYMBOL(il_free_geos);
3503
3504 static bool
3505 il_is_channel_extension(struct il_priv *il, enum ieee80211_band band,
3506                         u16 channel, u8 extension_chan_offset)
3507 {
3508         const struct il_channel_info *ch_info;
3509
3510         ch_info = il_get_channel_info(il, band, channel);
3511         if (!il_is_channel_valid(ch_info))
3512                 return false;
3513
3514         if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE)
3515                 return !(ch_info->
3516                          ht40_extension_channel & IEEE80211_CHAN_NO_HT40PLUS);
3517         else if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW)
3518                 return !(ch_info->
3519                          ht40_extension_channel & IEEE80211_CHAN_NO_HT40MINUS);
3520
3521         return false;
3522 }
3523
3524 bool
3525 il_is_ht40_tx_allowed(struct il_priv *il, struct ieee80211_sta_ht_cap *ht_cap)
3526 {
3527         if (!il->ht.enabled || !il->ht.is_40mhz)
3528                 return false;
3529
3530         /*
3531          * We do not check for IEEE80211_HT_CAP_SUP_WIDTH_20_40
3532          * the bit will not set if it is pure 40MHz case
3533          */
3534         if (ht_cap && !ht_cap->ht_supported)
3535                 return false;
3536
3537 #ifdef CONFIG_IWLEGACY_DEBUGFS
3538         if (il->disable_ht40)
3539                 return false;
3540 #endif
3541
3542         return il_is_channel_extension(il, il->band,
3543                                        le16_to_cpu(il->staging.channel),
3544                                        il->ht.extension_chan_offset);
3545 }
3546 EXPORT_SYMBOL(il_is_ht40_tx_allowed);
3547
3548 static u16
3549 il_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
3550 {
3551         u16 new_val;
3552         u16 beacon_factor;
3553
3554         /*
3555          * If mac80211 hasn't given us a beacon interval, program
3556          * the default into the device.
3557          */
3558         if (!beacon_val)
3559                 return DEFAULT_BEACON_INTERVAL;
3560
3561         /*
3562          * If the beacon interval we obtained from the peer
3563          * is too large, we'll have to wake up more often
3564          * (and in IBSS case, we'll beacon too much)
3565          *
3566          * For example, if max_beacon_val is 4096, and the
3567          * requested beacon interval is 7000, we'll have to
3568          * use 3500 to be able to wake up on the beacons.
3569          *
3570          * This could badly influence beacon detection stats.
3571          */
3572
3573         beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
3574         new_val = beacon_val / beacon_factor;
3575
3576         if (!new_val)
3577                 new_val = max_beacon_val;
3578
3579         return new_val;
3580 }
3581
3582 int
3583 il_send_rxon_timing(struct il_priv *il)
3584 {
3585         u64 tsf;
3586         s32 interval_tm, rem;
3587         struct ieee80211_conf *conf = NULL;
3588         u16 beacon_int;
3589         struct ieee80211_vif *vif = il->vif;
3590
3591         conf = &il->hw->conf;
3592
3593         lockdep_assert_held(&il->mutex);
3594
3595         memset(&il->timing, 0, sizeof(struct il_rxon_time_cmd));
3596
3597         il->timing.timestamp = cpu_to_le64(il->timestamp);
3598         il->timing.listen_interval = cpu_to_le16(conf->listen_interval);
3599
3600         beacon_int = vif ? vif->bss_conf.beacon_int : 0;
3601
3602         /*
3603          * TODO: For IBSS we need to get atim_win from mac80211,
3604          *       for now just always use 0
3605          */
3606         il->timing.atim_win = 0;
3607
3608         beacon_int =
3609             il_adjust_beacon_interval(beacon_int,
3610                                       il->hw_params.max_beacon_itrvl *
3611                                       TIME_UNIT);
3612         il->timing.beacon_interval = cpu_to_le16(beacon_int);
3613
3614         tsf = il->timestamp;    /* tsf is modifed by do_div: copy it */
3615         interval_tm = beacon_int * TIME_UNIT;
3616         rem = do_div(tsf, interval_tm);
3617         il->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
3618
3619         il->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ? : 1) : 1;
3620
3621         D_ASSOC("beacon interval %d beacon timer %d beacon tim %d\n",
3622                 le16_to_cpu(il->timing.beacon_interval),
3623                 le32_to_cpu(il->timing.beacon_init_val),
3624                 le16_to_cpu(il->timing.atim_win));
3625
3626         return il_send_cmd_pdu(il, C_RXON_TIMING, sizeof(il->timing),
3627                                &il->timing);
3628 }
3629 EXPORT_SYMBOL(il_send_rxon_timing);
3630
3631 void
3632 il_set_rxon_hwcrypto(struct il_priv *il, int hw_decrypt)
3633 {
3634         struct il_rxon_cmd *rxon = &il->staging;
3635
3636         if (hw_decrypt)
3637                 rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
3638         else
3639                 rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
3640
3641 }
3642 EXPORT_SYMBOL(il_set_rxon_hwcrypto);
3643
3644 /* validate RXON structure is valid */
3645 int
3646 il_check_rxon_cmd(struct il_priv *il)
3647 {
3648         struct il_rxon_cmd *rxon = &il->staging;
3649         bool error = false;
3650
3651         if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
3652                 if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
3653                         IL_WARN("check 2.4G: wrong narrow\n");
3654                         error = true;
3655                 }
3656                 if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
3657                         IL_WARN("check 2.4G: wrong radar\n");
3658                         error = true;
3659                 }
3660         } else {
3661                 if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
3662                         IL_WARN("check 5.2G: not short slot!\n");
3663                         error = true;
3664                 }
3665                 if (rxon->flags & RXON_FLG_CCK_MSK) {
3666                         IL_WARN("check 5.2G: CCK!\n");
3667                         error = true;
3668                 }
3669         }
3670         if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
3671                 IL_WARN("mac/bssid mcast!\n");
3672                 error = true;
3673         }
3674
3675         /* make sure basic rates 6Mbps and 1Mbps are supported */
3676         if ((rxon->ofdm_basic_rates & RATE_6M_MASK) == 0 &&
3677             (rxon->cck_basic_rates & RATE_1M_MASK) == 0) {
3678                 IL_WARN("neither 1 nor 6 are basic\n");
3679                 error = true;
3680         }
3681
3682         if (le16_to_cpu(rxon->assoc_id) > 2007) {
3683                 IL_WARN("aid > 2007\n");
3684                 error = true;
3685         }
3686
3687         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) ==
3688             (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
3689                 IL_WARN("CCK and short slot\n");
3690                 error = true;
3691         }
3692
3693         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) ==
3694             (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
3695                 IL_WARN("CCK and auto detect");
3696                 error = true;
3697         }
3698
3699         if ((rxon->
3700              flags & (RXON_FLG_AUTO_DETECT_MSK | RXON_FLG_TGG_PROTECT_MSK)) ==
3701             RXON_FLG_TGG_PROTECT_MSK) {
3702                 IL_WARN("TGg but no auto-detect\n");
3703                 error = true;
3704         }
3705
3706         if (error)
3707                 IL_WARN("Tuning to channel %d\n", le16_to_cpu(rxon->channel));
3708
3709         if (error) {
3710                 IL_ERR("Invalid RXON\n");
3711                 return -EINVAL;
3712         }
3713         return 0;
3714 }
3715 EXPORT_SYMBOL(il_check_rxon_cmd);
3716
3717 /**
3718  * il_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
3719  * @il: staging_rxon is compared to active_rxon
3720  *
3721  * If the RXON structure is changing enough to require a new tune,
3722  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
3723  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
3724  */
3725 int
3726 il_full_rxon_required(struct il_priv *il)
3727 {
3728         const struct il_rxon_cmd *staging = &il->staging;
3729         const struct il_rxon_cmd *active = &il->active;
3730
3731 #define CHK(cond)                                                       \
3732         if ((cond)) {                                                   \
3733                 D_INFO("need full RXON - " #cond "\n"); \
3734                 return 1;                                               \
3735         }
3736
3737 #define CHK_NEQ(c1, c2)                                         \
3738         if ((c1) != (c2)) {                                     \
3739                 D_INFO("need full RXON - "      \
3740                                #c1 " != " #c2 " - %d != %d\n",  \
3741                                (c1), (c2));                     \
3742                 return 1;                                       \
3743         }
3744
3745         /* These items are only settable from the full RXON command */
3746         CHK(!il_is_associated(il));
3747         CHK(compare_ether_addr(staging->bssid_addr, active->bssid_addr));
3748         CHK(compare_ether_addr(staging->node_addr, active->node_addr));
3749         CHK(compare_ether_addr
3750             (staging->wlap_bssid_addr, active->wlap_bssid_addr));
3751         CHK_NEQ(staging->dev_type, active->dev_type);
3752         CHK_NEQ(staging->channel, active->channel);
3753         CHK_NEQ(staging->air_propagation, active->air_propagation);
3754         CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
3755                 active->ofdm_ht_single_stream_basic_rates);
3756         CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
3757                 active->ofdm_ht_dual_stream_basic_rates);
3758         CHK_NEQ(staging->assoc_id, active->assoc_id);
3759
3760         /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
3761          * be updated with the RXON_ASSOC command -- however only some
3762          * flag transitions are allowed using RXON_ASSOC */
3763
3764         /* Check if we are not switching bands */
3765         CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
3766                 active->flags & RXON_FLG_BAND_24G_MSK);
3767
3768         /* Check if we are switching association toggle */
3769         CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
3770                 active->filter_flags & RXON_FILTER_ASSOC_MSK);
3771
3772 #undef CHK
3773 #undef CHK_NEQ
3774
3775         return 0;
3776 }
3777 EXPORT_SYMBOL(il_full_rxon_required);
3778
3779 u8
3780 il_get_lowest_plcp(struct il_priv *il)
3781 {
3782         /*
3783          * Assign the lowest rate -- should really get this from
3784          * the beacon skb from mac80211.
3785          */
3786         if (il->staging.flags & RXON_FLG_BAND_24G_MSK)
3787                 return RATE_1M_PLCP;
3788         else
3789                 return RATE_6M_PLCP;
3790 }
3791 EXPORT_SYMBOL(il_get_lowest_plcp);
3792
3793 static void
3794 _il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
3795 {
3796         struct il_rxon_cmd *rxon = &il->staging;
3797
3798         if (!il->ht.enabled) {
3799                 rxon->flags &=
3800                     ~(RXON_FLG_CHANNEL_MODE_MSK |
3801                       RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK | RXON_FLG_HT40_PROT_MSK
3802                       | RXON_FLG_HT_PROT_MSK);
3803                 return;
3804         }
3805
3806         rxon->flags |=
3807             cpu_to_le32(il->ht.protection << RXON_FLG_HT_OPERATING_MODE_POS);
3808
3809         /* Set up channel bandwidth:
3810          * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
3811         /* clear the HT channel mode before set the mode */
3812         rxon->flags &=
3813             ~(RXON_FLG_CHANNEL_MODE_MSK | RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
3814         if (il_is_ht40_tx_allowed(il, NULL)) {
3815                 /* pure ht40 */
3816                 if (il->ht.protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
3817                         rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
3818                         /* Note: control channel is opposite of extension channel */
3819                         switch (il->ht.extension_chan_offset) {
3820                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3821                                 rxon->flags &=
3822                                     ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
3823                                 break;
3824                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3825                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
3826                                 break;
3827                         }
3828                 } else {
3829                         /* Note: control channel is opposite of extension channel */
3830                         switch (il->ht.extension_chan_offset) {
3831                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3832                                 rxon->flags &=
3833                                     ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
3834                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
3835                                 break;
3836                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3837                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
3838                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
3839                                 break;
3840                         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
3841                         default:
3842                                 /* channel location only valid if in Mixed mode */
3843                                 IL_ERR("invalid extension channel offset\n");
3844                                 break;
3845                         }
3846                 }
3847         } else {
3848                 rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
3849         }
3850
3851         if (il->ops->set_rxon_chain)
3852                 il->ops->set_rxon_chain(il);
3853
3854         D_ASSOC("rxon flags 0x%X operation mode :0x%X "
3855                 "extension channel offset 0x%x\n", le32_to_cpu(rxon->flags),
3856                 il->ht.protection, il->ht.extension_chan_offset);
3857 }
3858
3859 void
3860 il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
3861 {
3862         _il_set_rxon_ht(il, ht_conf);
3863 }
3864 EXPORT_SYMBOL(il_set_rxon_ht);
3865
3866 /* Return valid, unused, channel for a passive scan to reset the RF */
3867 u8
3868 il_get_single_channel_number(struct il_priv *il, enum ieee80211_band band)
3869 {
3870         const struct il_channel_info *ch_info;
3871         int i;
3872         u8 channel = 0;
3873         u8 min, max;
3874
3875         if (band == IEEE80211_BAND_5GHZ) {
3876                 min = 14;
3877                 max = il->channel_count;
3878         } else {
3879                 min = 0;
3880                 max = 14;
3881         }
3882
3883         for (i = min; i < max; i++) {
3884                 channel = il->channel_info[i].channel;
3885                 if (channel == le16_to_cpu(il->staging.channel))
3886                         continue;
3887
3888                 ch_info = il_get_channel_info(il, band, channel);
3889                 if (il_is_channel_valid(ch_info))
3890                         break;
3891         }
3892
3893         return channel;
3894 }
3895 EXPORT_SYMBOL(il_get_single_channel_number);
3896
3897 /**
3898  * il_set_rxon_channel - Set the band and channel values in staging RXON
3899  * @ch: requested channel as a pointer to struct ieee80211_channel
3900
3901  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
3902  * in the staging RXON flag structure based on the ch->band
3903  */
3904 int
3905 il_set_rxon_channel(struct il_priv *il, struct ieee80211_channel *ch)
3906 {
3907         enum ieee80211_band band = ch->band;
3908         u16 channel = ch->hw_value;
3909
3910         if (le16_to_cpu(il->staging.channel) == channel && il->band == band)
3911                 return 0;
3912
3913         il->staging.channel = cpu_to_le16(channel);
3914         if (band == IEEE80211_BAND_5GHZ)
3915                 il->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
3916         else
3917                 il->staging.flags |= RXON_FLG_BAND_24G_MSK;
3918
3919         il->band = band;
3920
3921         D_INFO("Staging channel set to %d [%d]\n", channel, band);
3922
3923         return 0;
3924 }
3925 EXPORT_SYMBOL(il_set_rxon_channel);
3926
3927 void
3928 il_set_flags_for_band(struct il_priv *il, enum ieee80211_band band,
3929                       struct ieee80211_vif *vif)
3930 {
3931         if (band == IEEE80211_BAND_5GHZ) {
3932                 il->staging.flags &=
3933                     ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK |
3934                       RXON_FLG_CCK_MSK);
3935                 il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
3936         } else {
3937                 /* Copied from il_post_associate() */
3938                 if (vif && vif->bss_conf.use_short_slot)
3939                         il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
3940                 else
3941                         il->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
3942
3943                 il->staging.flags |= RXON_FLG_BAND_24G_MSK;
3944                 il->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
3945                 il->staging.flags &= ~RXON_FLG_CCK_MSK;
3946         }
3947 }
3948 EXPORT_SYMBOL(il_set_flags_for_band);
3949
3950 /*
3951  * initialize rxon structure with default values from eeprom
3952  */
3953 void
3954 il_connection_init_rx_config(struct il_priv *il)
3955 {
3956         const struct il_channel_info *ch_info;
3957
3958         memset(&il->staging, 0, sizeof(il->staging));
3959
3960         if (!il->vif) {
3961                 il->staging.dev_type = RXON_DEV_TYPE_ESS;
3962         } else if (il->vif->type == NL80211_IFTYPE_STATION) {
3963                 il->staging.dev_type = RXON_DEV_TYPE_ESS;
3964                 il->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
3965         } else if (il->vif->type == NL80211_IFTYPE_ADHOC) {
3966                 il->staging.dev_type = RXON_DEV_TYPE_IBSS;
3967                 il->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
3968                 il->staging.filter_flags =
3969                     RXON_FILTER_BCON_AWARE_MSK | RXON_FILTER_ACCEPT_GRP_MSK;
3970         } else {
3971                 IL_ERR("Unsupported interface type %d\n", il->vif->type);
3972                 return;
3973         }
3974
3975 #if 0
3976         /* TODO:  Figure out when short_preamble would be set and cache from
3977          * that */
3978         if (!hw_to_local(il->hw)->short_preamble)
3979                 il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
3980         else
3981                 il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
3982 #endif
3983
3984         ch_info =
3985             il_get_channel_info(il, il->band, le16_to_cpu(il->active.channel));
3986
3987         if (!ch_info)
3988                 ch_info = &il->channel_info[0];
3989
3990         il->staging.channel = cpu_to_le16(ch_info->channel);
3991         il->band = ch_info->band;
3992
3993         il_set_flags_for_band(il, il->band, il->vif);
3994
3995         il->staging.ofdm_basic_rates =
3996             (IL_OFDM_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
3997         il->staging.cck_basic_rates =
3998             (IL_CCK_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;
3999
4000         /* clear both MIX and PURE40 mode flag */
4001         il->staging.flags &=
4002             ~(RXON_FLG_CHANNEL_MODE_MIXED | RXON_FLG_CHANNEL_MODE_PURE_40);
4003         if (il->vif)
4004                 memcpy(il->staging.node_addr, il->vif->addr, ETH_ALEN);
4005
4006         il->staging.ofdm_ht_single_stream_basic_rates = 0xff;
4007         il->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
4008 }
4009 EXPORT_SYMBOL(il_connection_init_rx_config);
4010
4011 void
4012 il_set_rate(struct il_priv *il)
4013 {
4014         const struct ieee80211_supported_band *hw = NULL;
4015         struct ieee80211_rate *rate;
4016         int i;
4017
4018         hw = il_get_hw_mode(il, il->band);
4019         if (!hw) {
4020                 IL_ERR("Failed to set rate: unable to get hw mode\n");
4021                 return;
4022         }
4023
4024         il->active_rate = 0;
4025
4026         for (i = 0; i < hw->n_bitrates; i++) {
4027                 rate = &(hw->bitrates[i]);
4028                 if (rate->hw_value < RATE_COUNT_LEGACY)
4029                         il->active_rate |= (1 << rate->hw_value);
4030         }
4031
4032         D_RATE("Set active_rate = %0x\n", il->active_rate);
4033
4034         il->staging.cck_basic_rates =
4035             (IL_CCK_BASIC_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;
4036
4037         il->staging.ofdm_basic_rates =
4038             (IL_OFDM_BASIC_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
4039 }
4040 EXPORT_SYMBOL(il_set_rate);
4041
4042 void
4043 il_chswitch_done(struct il_priv *il, bool is_success)
4044 {
4045         if (test_bit(S_EXIT_PENDING, &il->status))
4046                 return;
4047
4048         if (test_and_clear_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
4049                 ieee80211_chswitch_done(il->vif, is_success);
4050 }
4051 EXPORT_SYMBOL(il_chswitch_done);
4052
4053 void
4054 il_hdl_csa(struct il_priv *il, struct il_rx_buf *rxb)
4055 {
4056         struct il_rx_pkt *pkt = rxb_addr(rxb);
4057         struct il_csa_notification *csa = &(pkt->u.csa_notif);
4058         struct il_rxon_cmd *rxon = (void *)&il->active;
4059
4060         if (!test_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
4061                 return;
4062
4063         if (!le32_to_cpu(csa->status) && csa->channel == il->switch_channel) {
4064                 rxon->channel = csa->channel;
4065                 il->staging.channel = csa->channel;
4066                 D_11H("CSA notif: channel %d\n", le16_to_cpu(csa->channel));
4067                 il_chswitch_done(il, true);
4068         } else {
4069                 IL_ERR("CSA notif (fail) : channel %d\n",
4070                        le16_to_cpu(csa->channel));
4071                 il_chswitch_done(il, false);
4072         }
4073 }
4074 EXPORT_SYMBOL(il_hdl_csa);
4075
4076 #ifdef CONFIG_IWLEGACY_DEBUG
4077 void
4078 il_print_rx_config_cmd(struct il_priv *il)
4079 {
4080         struct il_rxon_cmd *rxon = &il->staging;
4081
4082         D_RADIO("RX CONFIG:\n");
4083         il_print_hex_dump(il, IL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
4084         D_RADIO("u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
4085         D_RADIO("u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
4086         D_RADIO("u32 filter_flags: 0x%08x\n", le32_to_cpu(rxon->filter_flags));
4087         D_RADIO("u8 dev_type: 0x%x\n", rxon->dev_type);
4088         D_RADIO("u8 ofdm_basic_rates: 0x%02x\n", rxon->ofdm_basic_rates);
4089         D_RADIO("u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
4090         D_RADIO("u8[6] node_addr: %pM\n", rxon->node_addr);
4091         D_RADIO("u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
4092         D_RADIO("u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
4093 }
4094 EXPORT_SYMBOL(il_print_rx_config_cmd);
4095 #endif
4096 /**
4097  * il_irq_handle_error - called for HW or SW error interrupt from card
4098  */
4099 void
4100 il_irq_handle_error(struct il_priv *il)
4101 {
4102         /* Set the FW error flag -- cleared on il_down */
4103         set_bit(S_FW_ERROR, &il->status);
4104
4105         /* Cancel currently queued command. */
4106         clear_bit(S_HCMD_ACTIVE, &il->status);
4107
4108         IL_ERR("Loaded firmware version: %s\n", il->hw->wiphy->fw_version);
4109
4110         il->ops->dump_nic_error_log(il);
4111         if (il->ops->dump_fh)
4112                 il->ops->dump_fh(il, NULL, false);
4113 #ifdef CONFIG_IWLEGACY_DEBUG
4114         if (il_get_debug_level(il) & IL_DL_FW_ERRORS)
4115                 il_print_rx_config_cmd(il);
4116 #endif
4117
4118         wake_up(&il->wait_command_queue);
4119
4120         /* Keep the restart process from trying to send host
4121          * commands by clearing the INIT status bit */
4122         clear_bit(S_READY, &il->status);
4123
4124         if (!test_bit(S_EXIT_PENDING, &il->status)) {
4125                 IL_DBG(IL_DL_FW_ERRORS,
4126                        "Restarting adapter due to uCode error.\n");
4127
4128                 if (il->cfg->mod_params->restart_fw)
4129                         queue_work(il->workqueue, &il->restart);
4130         }
4131 }
4132 EXPORT_SYMBOL(il_irq_handle_error);
4133
4134 static int
4135 _il_apm_stop_master(struct il_priv *il)
4136 {
4137         int ret = 0;
4138
4139         /* stop device's busmaster DMA activity */
4140         _il_set_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);
4141
4142         ret =
4143             _il_poll_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
4144                          CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
4145         if (ret < 0)
4146                 IL_WARN("Master Disable Timed Out, 100 usec\n");
4147
4148         D_INFO("stop master\n");
4149
4150         return ret;
4151 }
4152
4153 void
4154 _il_apm_stop(struct il_priv *il)
4155 {
4156         lockdep_assert_held(&il->reg_lock);
4157
4158         D_INFO("Stop card, put in low power state\n");
4159
4160         /* Stop device's DMA activity */
4161         _il_apm_stop_master(il);
4162
4163         /* Reset the entire device */
4164         _il_set_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
4165
4166         udelay(10);
4167
4168         /*
4169          * Clear "initialization complete" bit to move adapter from
4170          * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
4171          */
4172         _il_clear_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
4173 }
4174 EXPORT_SYMBOL(_il_apm_stop);
4175
4176 void
4177 il_apm_stop(struct il_priv *il)
4178 {
4179         unsigned long flags;
4180
4181         spin_lock_irqsave(&il->reg_lock, flags);
4182         _il_apm_stop(il);
4183         spin_unlock_irqrestore(&il->reg_lock, flags);
4184 }
4185 EXPORT_SYMBOL(il_apm_stop);
4186
4187 /*
4188  * Start up NIC's basic functionality after it has been reset
4189  * (e.g. after platform boot, or shutdown via il_apm_stop())
4190  * NOTE:  This does not load uCode nor start the embedded processor
4191  */
4192 int
4193 il_apm_init(struct il_priv *il)
4194 {
4195         int ret = 0;
4196         u16 lctl;
4197
4198         D_INFO("Init card's basic functions\n");
4199
4200         /*
4201          * Use "set_bit" below rather than "write", to preserve any hardware
4202          * bits already set by default after reset.
4203          */
4204
4205         /* Disable L0S exit timer (platform NMI Work/Around) */
4206         il_set_bit(il, CSR_GIO_CHICKEN_BITS,
4207                    CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);
4208
4209         /*
4210          * Disable L0s without affecting L1;
4211          *  don't wait for ICH L0s (ICH bug W/A)
4212          */
4213         il_set_bit(il, CSR_GIO_CHICKEN_BITS,
4214                    CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);
4215
4216         /* Set FH wait threshold to maximum (HW error during stress W/A) */
4217         il_set_bit(il, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);
4218
4219         /*
4220          * Enable HAP INTA (interrupt from management bus) to
4221          * wake device's PCI Express link L1a -> L0s
4222          * NOTE:  This is no-op for 3945 (non-existent bit)
4223          */
4224         il_set_bit(il, CSR_HW_IF_CONFIG_REG,
4225                    CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);
4226
4227         /*
4228          * HW bug W/A for instability in PCIe bus L0->L0S->L1 transition.
4229          * Check if BIOS (or OS) enabled L1-ASPM on this device.
4230          * If so (likely), disable L0S, so device moves directly L0->L1;
4231          *    costs negligible amount of power savings.
4232          * If not (unlikely), enable L0S, so there is at least some
4233          *    power savings, even without L1.
4234          */
4235         if (il->cfg->set_l0s) {
4236                 lctl = il_pcie_link_ctl(il);
4237                 if ((lctl & PCI_CFG_LINK_CTRL_VAL_L1_EN) ==
4238                     PCI_CFG_LINK_CTRL_VAL_L1_EN) {
4239                         /* L1-ASPM enabled; disable(!) L0S  */
4240                         il_set_bit(il, CSR_GIO_REG,
4241                                    CSR_GIO_REG_VAL_L0S_ENABLED);
4242                         D_POWER("L1 Enabled; Disabling L0S\n");
4243                 } else {
4244                         /* L1-ASPM disabled; enable(!) L0S */
4245                         il_clear_bit(il, CSR_GIO_REG,
4246                                      CSR_GIO_REG_VAL_L0S_ENABLED);
4247                         D_POWER("L1 Disabled; Enabling L0S\n");
4248                 }
4249         }
4250
4251         /* Configure analog phase-lock-loop before activating to D0A */
4252         if (il->cfg->pll_cfg_val)
4253                 il_set_bit(il, CSR_ANA_PLL_CFG,
4254                            il->cfg->pll_cfg_val);
4255
4256         /*
4257          * Set "initialization complete" bit to move adapter from
4258          * D0U* --> D0A* (powered-up active) state.
4259          */
4260         il_set_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
4261
4262         /*
4263          * Wait for clock stabilization; once stabilized, access to
4264          * device-internal resources is supported, e.g. il_wr_prph()
4265          * and accesses to uCode SRAM.
4266          */
4267         ret =
4268             _il_poll_bit(il, CSR_GP_CNTRL,
4269                          CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
4270                          CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
4271         if (ret < 0) {
4272                 D_INFO("Failed to init the card\n");
4273                 goto out;
4274         }
4275
4276         /*
4277          * Enable DMA and BSM (if used) clocks, wait for them to stabilize.
4278          * BSM (Boostrap State Machine) is only in 3945 and 4965.
4279          *
4280          * Write to "CLK_EN_REG"; "1" bits enable clocks, while "0" bits
4281          * do not disable clocks.  This preserves any hardware bits already
4282          * set by default in "CLK_CTRL_REG" after reset.
4283          */
4284         if (il->cfg->use_bsm)
4285                 il_wr_prph(il, APMG_CLK_EN_REG,
4286                            APMG_CLK_VAL_DMA_CLK_RQT | APMG_CLK_VAL_BSM_CLK_RQT);
4287         else
4288                 il_wr_prph(il, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT);
4289         udelay(20);
4290
4291         /* Disable L1-Active */
4292         il_set_bits_prph(il, APMG_PCIDEV_STT_REG,
4293                          APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
4294
4295 out:
4296         return ret;
4297 }
4298 EXPORT_SYMBOL(il_apm_init);
4299
4300 int
4301 il_set_tx_power(struct il_priv *il, s8 tx_power, bool force)
4302 {
4303         int ret;
4304         s8 prev_tx_power;
4305         bool defer;
4306
4307         lockdep_assert_held(&il->mutex);
4308
4309         if (il->tx_power_user_lmt == tx_power && !force)
4310                 return 0;
4311
4312         if (!il->ops->send_tx_power)
4313                 return -EOPNOTSUPP;
4314
4315         /* 0 dBm mean 1 milliwatt */
4316         if (tx_power < 0) {
4317                 IL_WARN("Requested user TXPOWER %d below 1 mW.\n", tx_power);
4318                 return -EINVAL;
4319         }
4320
4321         if (tx_power > il->tx_power_device_lmt) {
4322                 IL_WARN("Requested user TXPOWER %d above upper limit %d.\n",
4323                         tx_power, il->tx_power_device_lmt);
4324                 return -EINVAL;
4325         }
4326
4327         if (!il_is_ready_rf(il))
4328                 return -EIO;
4329
4330         /* scan complete and commit_rxon use tx_power_next value,
4331          * it always need to be updated for newest request */
4332         il->tx_power_next = tx_power;
4333
4334         /* do not set tx power when scanning or channel changing */
4335         defer = test_bit(S_SCANNING, &il->status) ||
4336             memcmp(&il->active, &il->staging, sizeof(il->staging));
4337         if (defer && !force) {
4338                 D_INFO("Deferring tx power set\n");
4339                 return 0;
4340         }
4341
4342         prev_tx_power = il->tx_power_user_lmt;
4343         il->tx_power_user_lmt = tx_power;
4344
4345         ret = il->ops->send_tx_power(il);
4346
4347         /* if fail to set tx_power, restore the orig. tx power */
4348         if (ret) {
4349                 il->tx_power_user_lmt = prev_tx_power;
4350                 il->tx_power_next = prev_tx_power;
4351         }
4352         return ret;
4353 }
4354 EXPORT_SYMBOL(il_set_tx_power);
4355
4356 void
4357 il_send_bt_config(struct il_priv *il)
4358 {
4359         struct il_bt_cmd bt_cmd = {
4360                 .lead_time = BT_LEAD_TIME_DEF,
4361                 .max_kill = BT_MAX_KILL_DEF,
4362                 .kill_ack_mask = 0,
4363                 .kill_cts_mask = 0,
4364         };
4365
4366         if (!bt_coex_active)
4367                 bt_cmd.flags = BT_COEX_DISABLE;
4368         else
4369                 bt_cmd.flags = BT_COEX_ENABLE;
4370
4371         D_INFO("BT coex %s\n",
4372                (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");
4373
4374         if (il_send_cmd_pdu(il, C_BT_CONFIG, sizeof(struct il_bt_cmd), &bt_cmd))
4375                 IL_ERR("failed to send BT Coex Config\n");
4376 }
4377 EXPORT_SYMBOL(il_send_bt_config);
4378
4379 int
4380 il_send_stats_request(struct il_priv *il, u8 flags, bool clear)
4381 {
4382         struct il_stats_cmd stats_cmd = {
4383                 .configuration_flags = clear ? IL_STATS_CONF_CLEAR_STATS : 0,
4384         };
4385
4386         if (flags & CMD_ASYNC)
4387                 return il_send_cmd_pdu_async(il, C_STATS, sizeof(struct il_stats_cmd),
4388                                              &stats_cmd, NULL);
4389         else
4390                 return il_send_cmd_pdu(il, C_STATS, sizeof(struct il_stats_cmd),
4391                                        &stats_cmd);
4392 }
4393 EXPORT_SYMBOL(il_send_stats_request);
4394
4395 void
4396 il_hdl_pm_sleep(struct il_priv *il, struct il_rx_buf *rxb)
4397 {
4398 #ifdef CONFIG_IWLEGACY_DEBUG
4399         struct il_rx_pkt *pkt = rxb_addr(rxb);
4400         struct il_sleep_notification *sleep = &(pkt->u.sleep_notif);
4401         D_RX("sleep mode: %d, src: %d\n",
4402              sleep->pm_sleep_mode, sleep->pm_wakeup_src);
4403 #endif
4404 }
4405 EXPORT_SYMBOL(il_hdl_pm_sleep);
4406
4407 void
4408 il_hdl_pm_debug_stats(struct il_priv *il, struct il_rx_buf *rxb)
4409 {
4410         struct il_rx_pkt *pkt = rxb_addr(rxb);
4411         u32 len = le32_to_cpu(pkt->len_n_flags) & IL_RX_FRAME_SIZE_MSK;
4412         D_RADIO("Dumping %d bytes of unhandled notification for %s:\n", len,
4413                 il_get_cmd_string(pkt->hdr.cmd));
4414         il_print_hex_dump(il, IL_DL_RADIO, pkt->u.raw, len);
4415 }
4416 EXPORT_SYMBOL(il_hdl_pm_debug_stats);
4417
4418 void
4419 il_hdl_error(struct il_priv *il, struct il_rx_buf *rxb)
4420 {
4421         struct il_rx_pkt *pkt = rxb_addr(rxb);
4422
4423         IL_ERR("Error Reply type 0x%08X cmd %s (0x%02X) "
4424                "seq 0x%04X ser 0x%08X\n",
4425                le32_to_cpu(pkt->u.err_resp.error_type),
4426                il_get_cmd_string(pkt->u.err_resp.cmd_id),
4427                pkt->u.err_resp.cmd_id,
4428                le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
4429                le32_to_cpu(pkt->u.err_resp.error_info));
4430 }
4431 EXPORT_SYMBOL(il_hdl_error);
4432
4433 void
4434 il_clear_isr_stats(struct il_priv *il)
4435 {
4436         memset(&il->isr_stats, 0, sizeof(il->isr_stats));
4437 }
4438
4439 int
4440 il_mac_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif, u16 queue,
4441                const struct ieee80211_tx_queue_params *params)
4442 {
4443         struct il_priv *il = hw->priv;
4444         unsigned long flags;
4445         int q;
4446
4447         D_MAC80211("enter\n");
4448
4449         if (!il_is_ready_rf(il)) {
4450                 D_MAC80211("leave - RF not ready\n");
4451                 return -EIO;
4452         }
4453
4454         if (queue >= AC_NUM) {
4455                 D_MAC80211("leave - queue >= AC_NUM %d\n", queue);
4456                 return 0;
4457         }
4458
4459         q = AC_NUM - 1 - queue;
4460
4461         spin_lock_irqsave(&il->lock, flags);
4462
4463         il->qos_data.def_qos_parm.ac[q].cw_min =
4464             cpu_to_le16(params->cw_min);
4465         il->qos_data.def_qos_parm.ac[q].cw_max =
4466             cpu_to_le16(params->cw_max);
4467         il->qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
4468         il->qos_data.def_qos_parm.ac[q].edca_txop =
4469             cpu_to_le16((params->txop * 32));
4470
4471         il->qos_data.def_qos_parm.ac[q].reserved1 = 0;
4472
4473         spin_unlock_irqrestore(&il->lock, flags);
4474
4475         D_MAC80211("leave\n");
4476         return 0;
4477 }
4478 EXPORT_SYMBOL(il_mac_conf_tx);
4479
4480 int
4481 il_mac_tx_last_beacon(struct ieee80211_hw *hw)
4482 {
4483         struct il_priv *il = hw->priv;
4484         int ret;
4485
4486         D_MAC80211("enter\n");
4487
4488         ret = (il->ibss_manager == IL_IBSS_MANAGER);
4489
4490         D_MAC80211("leave ret %d\n", ret);
4491         return ret;
4492 }
4493 EXPORT_SYMBOL_GPL(il_mac_tx_last_beacon);
4494
4495 static int
4496 il_set_mode(struct il_priv *il)
4497 {
4498         il_connection_init_rx_config(il);
4499
4500         if (il->ops->set_rxon_chain)
4501                 il->ops->set_rxon_chain(il);
4502
4503         return il_commit_rxon(il);
4504 }
4505
4506 int
4507 il_mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
4508 {
4509         struct il_priv *il = hw->priv;
4510         int err;
4511         bool reset;
4512
4513         mutex_lock(&il->mutex);
4514         D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
4515
4516         if (!il_is_ready_rf(il)) {
4517                 IL_WARN("Try to add interface when device not ready\n");
4518                 err = -EINVAL;
4519                 goto out;
4520         }
4521
4522         /*
4523          * We do not support multiple virtual interfaces, but on hardware reset
4524          * we have to add the same interface again.
4525          */
4526         reset = (il->vif == vif);
4527         if (il->vif && !reset) {
4528                 err = -EOPNOTSUPP;
4529                 goto out;
4530         }
4531
4532         il->vif = vif;
4533         il->iw_mode = vif->type;
4534
4535         err = il_set_mode(il);
4536         if (err) {
4537                 IL_WARN("Fail to set mode %d\n", vif->type);
4538                 if (!reset) {
4539                         il->vif = NULL;
4540                         il->iw_mode = NL80211_IFTYPE_STATION;
4541                 }
4542         }
4543
4544 out:
4545         D_MAC80211("leave err %d\n", err);
4546         mutex_unlock(&il->mutex);
4547
4548         return err;
4549 }
4550 EXPORT_SYMBOL(il_mac_add_interface);
4551
4552 static void
4553 il_teardown_interface(struct il_priv *il, struct ieee80211_vif *vif,
4554                       bool mode_change)
4555 {
4556         lockdep_assert_held(&il->mutex);
4557
4558         if (il->scan_vif == vif) {
4559                 il_scan_cancel_timeout(il, 200);
4560                 il_force_scan_end(il);
4561         }
4562
4563         if (!mode_change)
4564                 il_set_mode(il);
4565
4566 }
4567
4568 void
4569 il_mac_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
4570 {
4571         struct il_priv *il = hw->priv;
4572
4573         mutex_lock(&il->mutex);
4574         D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
4575
4576         WARN_ON(il->vif != vif);
4577         il->vif = NULL;
4578
4579         il_teardown_interface(il, vif, false);
4580         memset(il->bssid, 0, ETH_ALEN);
4581
4582         D_MAC80211("leave\n");
4583         mutex_unlock(&il->mutex);
4584 }
4585 EXPORT_SYMBOL(il_mac_remove_interface);
4586
4587 int
4588 il_alloc_txq_mem(struct il_priv *il)
4589 {
4590         if (!il->txq)
4591                 il->txq =
4592                     kzalloc(sizeof(struct il_tx_queue) *
4593                             il->cfg->num_of_queues, GFP_KERNEL);
4594         if (!il->txq) {
4595                 IL_ERR("Not enough memory for txq\n");
4596                 return -ENOMEM;
4597         }
4598         return 0;
4599 }
4600 EXPORT_SYMBOL(il_alloc_txq_mem);
4601
4602 void
4603 il_free_txq_mem(struct il_priv *il)
4604 {
4605         kfree(il->txq);
4606         il->txq = NULL;
4607 }
4608 EXPORT_SYMBOL(il_free_txq_mem);
4609
4610 int
4611 il_force_reset(struct il_priv *il, bool external)
4612 {
4613         struct il_force_reset *force_reset;
4614
4615         if (test_bit(S_EXIT_PENDING, &il->status))
4616                 return -EINVAL;
4617
4618         force_reset = &il->force_reset;
4619         force_reset->reset_request_count++;
4620         if (!external) {
4621                 if (force_reset->last_force_reset_jiffies &&
4622                     time_after(force_reset->last_force_reset_jiffies +
4623                                force_reset->reset_duration, jiffies)) {
4624                         D_INFO("force reset rejected\n");
4625                         force_reset->reset_reject_count++;
4626                         return -EAGAIN;
4627                 }
4628         }
4629         force_reset->reset_success_count++;
4630         force_reset->last_force_reset_jiffies = jiffies;
4631
4632         /*
4633          * if the request is from external(ex: debugfs),
4634          * then always perform the request in regardless the module
4635          * parameter setting
4636          * if the request is from internal (uCode error or driver
4637          * detect failure), then fw_restart module parameter
4638          * need to be check before performing firmware reload
4639          */
4640
4641         if (!external && !il->cfg->mod_params->restart_fw) {
4642                 D_INFO("Cancel firmware reload based on "
4643                        "module parameter setting\n");
4644                 return 0;
4645         }
4646
4647         IL_ERR("On demand firmware reload\n");
4648
4649         /* Set the FW error flag -- cleared on il_down */
4650         set_bit(S_FW_ERROR, &il->status);
4651         wake_up(&il->wait_command_queue);
4652         /*
4653          * Keep the restart process from trying to send host
4654          * commands by clearing the INIT status bit
4655          */
4656         clear_bit(S_READY, &il->status);
4657         queue_work(il->workqueue, &il->restart);
4658
4659         return 0;
4660 }
4661
4662 int
4663 il_mac_change_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4664                         enum nl80211_iftype newtype, bool newp2p)
4665 {
4666         struct il_priv *il = hw->priv;
4667         int err;
4668
4669         mutex_lock(&il->mutex);
4670         D_MAC80211("enter: type %d, addr %pM newtype %d newp2p %d\n",
4671                     vif->type, vif->addr, newtype, newp2p);
4672
4673         if (newp2p) {
4674                 err = -EOPNOTSUPP;
4675                 goto out;
4676         }
4677
4678         if (!il->vif || !il_is_ready_rf(il)) {
4679                 /*
4680                  * Huh? But wait ... this can maybe happen when
4681                  * we're in the middle of a firmware restart!
4682                  */
4683                 err = -EBUSY;
4684                 goto out;
4685         }
4686
4687         /* success */
4688         il_teardown_interface(il, vif, true);
4689         vif->type = newtype;
4690         vif->p2p = false;
4691         err = il_set_mode(il);
4692         WARN_ON(err);
4693         /*
4694          * We've switched internally, but submitting to the
4695          * device may have failed for some reason. Mask this
4696          * error, because otherwise mac80211 will not switch
4697          * (and set the interface type back) and we'll be
4698          * out of sync with it.
4699          */
4700         err = 0;
4701
4702 out:
4703         D_MAC80211("leave err %d\n", err);
4704         mutex_unlock(&il->mutex);
4705
4706         return err;
4707 }
4708 EXPORT_SYMBOL(il_mac_change_interface);
4709
4710 /*
4711  * On every watchdog tick we check (latest) time stamp. If it does not
4712  * change during timeout period and queue is not empty we reset firmware.
4713  */
4714 static int
4715 il_check_stuck_queue(struct il_priv *il, int cnt)
4716 {
4717         struct il_tx_queue *txq = &il->txq[cnt];
4718         struct il_queue *q = &txq->q;
4719         unsigned long timeout;
4720         int ret;
4721
4722         if (q->read_ptr == q->write_ptr) {
4723                 txq->time_stamp = jiffies;
4724                 return 0;
4725         }
4726
4727         timeout =
4728             txq->time_stamp +
4729             msecs_to_jiffies(il->cfg->wd_timeout);
4730
4731         if (time_after(jiffies, timeout)) {
4732                 IL_ERR("Queue %d stuck for %u ms.\n", q->id,
4733                        il->cfg->wd_timeout);
4734                 ret = il_force_reset(il, false);
4735                 return (ret == -EAGAIN) ? 0 : 1;
4736         }
4737
4738         return 0;
4739 }
4740
4741 /*
4742  * Making watchdog tick be a quarter of timeout assure we will
4743  * discover the queue hung between timeout and 1.25*timeout
4744  */
4745 #define IL_WD_TICK(timeout) ((timeout) / 4)
4746
4747 /*
4748  * Watchdog timer callback, we check each tx queue for stuck, if if hung
4749  * we reset the firmware. If everything is fine just rearm the timer.
4750  */
4751 void
4752 il_bg_watchdog(unsigned long data)
4753 {
4754         struct il_priv *il = (struct il_priv *)data;
4755         int cnt;
4756         unsigned long timeout;
4757
4758         if (test_bit(S_EXIT_PENDING, &il->status))
4759                 return;
4760
4761         timeout = il->cfg->wd_timeout;
4762         if (timeout == 0)
4763                 return;
4764
4765         /* monitor and check for stuck cmd queue */
4766         if (il_check_stuck_queue(il, il->cmd_queue))
4767                 return;
4768
4769         /* monitor and check for other stuck queues */
4770         if (il_is_any_associated(il)) {
4771                 for (cnt = 0; cnt < il->hw_params.max_txq_num; cnt++) {
4772                         /* skip as we already checked the command queue */
4773                         if (cnt == il->cmd_queue)
4774                                 continue;
4775                         if (il_check_stuck_queue(il, cnt))
4776                                 return;
4777                 }
4778         }
4779
4780         mod_timer(&il->watchdog,
4781                   jiffies + msecs_to_jiffies(IL_WD_TICK(timeout)));
4782 }
4783 EXPORT_SYMBOL(il_bg_watchdog);
4784
4785 void
4786 il_setup_watchdog(struct il_priv *il)
4787 {
4788         unsigned int timeout = il->cfg->wd_timeout;
4789
4790         if (timeout)
4791                 mod_timer(&il->watchdog,
4792                           jiffies + msecs_to_jiffies(IL_WD_TICK(timeout)));
4793         else
4794                 del_timer(&il->watchdog);
4795 }
4796 EXPORT_SYMBOL(il_setup_watchdog);
4797
4798 /*
4799  * extended beacon time format
4800  * time in usec will be changed into a 32-bit value in extended:internal format
4801  * the extended part is the beacon counts
4802  * the internal part is the time in usec within one beacon interval
4803  */
4804 u32
4805 il_usecs_to_beacons(struct il_priv *il, u32 usec, u32 beacon_interval)
4806 {
4807         u32 quot;
4808         u32 rem;
4809         u32 interval = beacon_interval * TIME_UNIT;
4810
4811         if (!interval || !usec)
4812                 return 0;
4813
4814         quot =
4815             (usec /
4816              interval) & (il_beacon_time_mask_high(il,
4817                                                    il->hw_params.
4818                                                    beacon_time_tsf_bits) >> il->
4819                           hw_params.beacon_time_tsf_bits);
4820         rem =
4821             (usec % interval) & il_beacon_time_mask_low(il,
4822                                                         il->hw_params.
4823                                                         beacon_time_tsf_bits);
4824
4825         return (quot << il->hw_params.beacon_time_tsf_bits) + rem;
4826 }
4827 EXPORT_SYMBOL(il_usecs_to_beacons);
4828
4829 /* base is usually what we get from ucode with each received frame,
4830  * the same as HW timer counter counting down
4831  */
4832 __le32
4833 il_add_beacon_time(struct il_priv *il, u32 base, u32 addon,
4834                    u32 beacon_interval)
4835 {
4836         u32 base_low = base & il_beacon_time_mask_low(il,
4837                                                       il->hw_params.
4838                                                       beacon_time_tsf_bits);
4839         u32 addon_low = addon & il_beacon_time_mask_low(il,
4840                                                         il->hw_params.
4841                                                         beacon_time_tsf_bits);
4842         u32 interval = beacon_interval * TIME_UNIT;
4843         u32 res = (base & il_beacon_time_mask_high(il,
4844                                                    il->hw_params.
4845                                                    beacon_time_tsf_bits)) +
4846             (addon & il_beacon_time_mask_high(il,
4847                                               il->hw_params.
4848                                               beacon_time_tsf_bits));
4849
4850         if (base_low > addon_low)
4851                 res += base_low - addon_low;
4852         else if (base_low < addon_low) {
4853                 res += interval + base_low - addon_low;
4854                 res += (1 << il->hw_params.beacon_time_tsf_bits);
4855         } else
4856                 res += (1 << il->hw_params.beacon_time_tsf_bits);
4857
4858         return cpu_to_le32(res);
4859 }
4860 EXPORT_SYMBOL(il_add_beacon_time);
4861
4862 #ifdef CONFIG_PM
4863
4864 int
4865 il_pci_suspend(struct device *device)
4866 {
4867         struct pci_dev *pdev = to_pci_dev(device);
4868         struct il_priv *il = pci_get_drvdata(pdev);
4869
4870         /*
4871          * This function is called when system goes into suspend state
4872          * mac80211 will call il_mac_stop() from the mac80211 suspend function
4873          * first but since il_mac_stop() has no knowledge of who the caller is,
4874          * it will not call apm_ops.stop() to stop the DMA operation.
4875          * Calling apm_ops.stop here to make sure we stop the DMA.
4876          */
4877         il_apm_stop(il);
4878
4879         return 0;
4880 }
4881 EXPORT_SYMBOL(il_pci_suspend);
4882
4883 int
4884 il_pci_resume(struct device *device)
4885 {
4886         struct pci_dev *pdev = to_pci_dev(device);
4887         struct il_priv *il = pci_get_drvdata(pdev);
4888         bool hw_rfkill = false;
4889
4890         /*
4891          * We disable the RETRY_TIMEOUT register (0x41) to keep
4892          * PCI Tx retries from interfering with C3 CPU state.
4893          */
4894         pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);
4895
4896         il_enable_interrupts(il);
4897
4898         if (!(_il_rd(il, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
4899                 hw_rfkill = true;
4900
4901         if (hw_rfkill)
4902                 set_bit(S_RFKILL, &il->status);
4903         else
4904                 clear_bit(S_RFKILL, &il->status);
4905
4906         wiphy_rfkill_set_hw_state(il->hw->wiphy, hw_rfkill);
4907
4908         return 0;
4909 }
4910 EXPORT_SYMBOL(il_pci_resume);
4911
4912 const struct dev_pm_ops il_pm_ops = {
4913         .suspend = il_pci_suspend,
4914         .resume = il_pci_resume,
4915         .freeze = il_pci_suspend,
4916         .thaw = il_pci_resume,
4917         .poweroff = il_pci_suspend,
4918         .restore = il_pci_resume,
4919 };
4920 EXPORT_SYMBOL(il_pm_ops);
4921
4922 #endif /* CONFIG_PM */
4923
4924 static void
4925 il_update_qos(struct il_priv *il)
4926 {
4927         if (test_bit(S_EXIT_PENDING, &il->status))
4928                 return;
4929
4930         il->qos_data.def_qos_parm.qos_flags = 0;
4931
4932         if (il->qos_data.qos_active)
4933                 il->qos_data.def_qos_parm.qos_flags |=
4934                     QOS_PARAM_FLG_UPDATE_EDCA_MSK;
4935
4936         if (il->ht.enabled)
4937                 il->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
4938
4939         D_QOS("send QoS cmd with Qos active=%d FLAGS=0x%X\n",
4940               il->qos_data.qos_active, il->qos_data.def_qos_parm.qos_flags);
4941
4942         il_send_cmd_pdu_async(il, C_QOS_PARAM, sizeof(struct il_qosparam_cmd),
4943                               &il->qos_data.def_qos_parm, NULL);
4944 }
4945
4946 /**
4947  * il_mac_config - mac80211 config callback
4948  */
4949 int
4950 il_mac_config(struct ieee80211_hw *hw, u32 changed)
4951 {
4952         struct il_priv *il = hw->priv;
4953         const struct il_channel_info *ch_info;
4954         struct ieee80211_conf *conf = &hw->conf;
4955         struct ieee80211_channel *channel = conf->channel;
4956         struct il_ht_config *ht_conf = &il->current_ht_config;
4957         unsigned long flags = 0;
4958         int ret = 0;
4959         u16 ch;
4960         int scan_active = 0;
4961         bool ht_changed = false;
4962
4963         mutex_lock(&il->mutex);
4964         D_MAC80211("enter: channel %d changed 0x%X\n", channel->hw_value,
4965                    changed);
4966
4967         if (unlikely(test_bit(S_SCANNING, &il->status))) {
4968                 scan_active = 1;
4969                 D_MAC80211("scan active\n");
4970         }
4971
4972         if (changed &
4973             (IEEE80211_CONF_CHANGE_SMPS | IEEE80211_CONF_CHANGE_CHANNEL)) {
4974                 /* mac80211 uses static for non-HT which is what we want */
4975                 il->current_ht_config.smps = conf->smps_mode;
4976
4977                 /*
4978                  * Recalculate chain counts.
4979                  *
4980                  * If monitor mode is enabled then mac80211 will
4981                  * set up the SM PS mode to OFF if an HT channel is
4982                  * configured.
4983                  */
4984                 if (il->ops->set_rxon_chain)
4985                         il->ops->set_rxon_chain(il);
4986         }
4987
4988         /* during scanning mac80211 will delay channel setting until
4989          * scan finish with changed = 0
4990          */
4991         if (!changed || (changed & IEEE80211_CONF_CHANGE_CHANNEL)) {
4992
4993                 if (scan_active)
4994                         goto set_ch_out;
4995
4996                 ch = channel->hw_value;
4997                 ch_info = il_get_channel_info(il, channel->band, ch);
4998                 if (!il_is_channel_valid(ch_info)) {
4999                         D_MAC80211("leave - invalid channel\n");
5000                         ret = -EINVAL;
5001                         goto set_ch_out;
5002                 }
5003
5004                 if (il->iw_mode == NL80211_IFTYPE_ADHOC &&
5005                     !il_is_channel_ibss(ch_info)) {
5006                         D_MAC80211("leave - not IBSS channel\n");
5007                         ret = -EINVAL;
5008                         goto set_ch_out;
5009                 }
5010
5011                 spin_lock_irqsave(&il->lock, flags);
5012
5013                 /* Configure HT40 channels */
5014                 if (il->ht.enabled != conf_is_ht(conf)) {
5015                         il->ht.enabled = conf_is_ht(conf);
5016                         ht_changed = true;
5017                 }
5018                 if (il->ht.enabled) {
5019                         if (conf_is_ht40_minus(conf)) {
5020                                 il->ht.extension_chan_offset =
5021                                     IEEE80211_HT_PARAM_CHA_SEC_BELOW;
5022                                 il->ht.is_40mhz = true;
5023                         } else if (conf_is_ht40_plus(conf)) {
5024                                 il->ht.extension_chan_offset =
5025                                     IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
5026                                 il->ht.is_40mhz = true;
5027                         } else {
5028                                 il->ht.extension_chan_offset =
5029                                     IEEE80211_HT_PARAM_CHA_SEC_NONE;
5030                                 il->ht.is_40mhz = false;
5031                         }
5032                 } else
5033                         il->ht.is_40mhz = false;
5034
5035                 /*
5036                  * Default to no protection. Protection mode will
5037                  * later be set from BSS config in il_ht_conf
5038                  */
5039                 il->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
5040
5041                 /* if we are switching from ht to 2.4 clear flags
5042                  * from any ht related info since 2.4 does not
5043                  * support ht */
5044                 if ((le16_to_cpu(il->staging.channel) != ch))
5045                         il->staging.flags = 0;
5046
5047                 il_set_rxon_channel(il, channel);
5048                 il_set_rxon_ht(il, ht_conf);
5049
5050                 il_set_flags_for_band(il, channel->band, il->vif);
5051
5052                 spin_unlock_irqrestore(&il->lock, flags);
5053
5054                 if (il->ops->update_bcast_stations)
5055                         ret = il->ops->update_bcast_stations(il);
5056
5057 set_ch_out:
5058                 /* The list of supported rates and rate mask can be different
5059                  * for each band; since the band may have changed, reset
5060                  * the rate mask to what mac80211 lists */
5061                 il_set_rate(il);
5062         }
5063
5064         if (changed & (IEEE80211_CONF_CHANGE_PS | IEEE80211_CONF_CHANGE_IDLE)) {
5065                 ret = il_power_update_mode(il, false);
5066                 if (ret)
5067                         D_MAC80211("Error setting sleep level\n");
5068         }
5069
5070         if (changed & IEEE80211_CONF_CHANGE_POWER) {
5071                 D_MAC80211("TX Power old=%d new=%d\n", il->tx_power_user_lmt,
5072                            conf->power_level);
5073
5074                 il_set_tx_power(il, conf->power_level, false);
5075         }
5076
5077         if (!il_is_ready(il)) {
5078                 D_MAC80211("leave - not ready\n");
5079                 goto out;
5080         }
5081
5082         if (scan_active)
5083                 goto out;
5084
5085         if (memcmp(&il->active, &il->staging, sizeof(il->staging)))
5086                 il_commit_rxon(il);
5087         else
5088                 D_INFO("Not re-sending same RXON configuration.\n");
5089         if (ht_changed)
5090                 il_update_qos(il);
5091
5092 out:
5093         D_MAC80211("leave ret %d\n", ret);
5094         mutex_unlock(&il->mutex);
5095
5096         return ret;
5097 }
5098 EXPORT_SYMBOL(il_mac_config);
5099
5100 void
5101 il_mac_reset_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
5102 {
5103         struct il_priv *il = hw->priv;
5104         unsigned long flags;
5105
5106         mutex_lock(&il->mutex);
5107         D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
5108
5109         spin_lock_irqsave(&il->lock, flags);
5110
5111         memset(&il->current_ht_config, 0, sizeof(struct il_ht_config));
5112
5113         /* new association get rid of ibss beacon skb */
5114         if (il->beacon_skb)
5115                 dev_kfree_skb(il->beacon_skb);
5116         il->beacon_skb = NULL;
5117         il->timestamp = 0;
5118
5119         spin_unlock_irqrestore(&il->lock, flags);
5120
5121         il_scan_cancel_timeout(il, 100);
5122         if (!il_is_ready_rf(il)) {
5123                 D_MAC80211("leave - not ready\n");
5124                 mutex_unlock(&il->mutex);
5125                 return;
5126         }
5127
5128         /* we are restarting association process */
5129         il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
5130         il_commit_rxon(il);
5131
5132         il_set_rate(il);
5133
5134         D_MAC80211("leave\n");
5135         mutex_unlock(&il->mutex);
5136 }
5137 EXPORT_SYMBOL(il_mac_reset_tsf);
5138
5139 static void
5140 il_ht_conf(struct il_priv *il, struct ieee80211_vif *vif)
5141 {
5142         struct il_ht_config *ht_conf = &il->current_ht_config;
5143         struct ieee80211_sta *sta;
5144         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
5145
5146         D_ASSOC("enter:\n");
5147
5148         if (!il->ht.enabled)
5149                 return;
5150
5151         il->ht.protection =
5152             bss_conf->ht_operation_mode & IEEE80211_HT_OP_MODE_PROTECTION;
5153         il->ht.non_gf_sta_present =
5154             !!(bss_conf->
5155                ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
5156
5157         ht_conf->single_chain_sufficient = false;
5158
5159         switch (vif->type) {
5160         case NL80211_IFTYPE_STATION:
5161                 rcu_read_lock();
5162                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
5163                 if (sta) {
5164                         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
5165                         int maxstreams;
5166
5167                         maxstreams =
5168                             (ht_cap->mcs.
5169                              tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
5170                             >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
5171                         maxstreams += 1;
5172
5173                         if (ht_cap->mcs.rx_mask[1] == 0 &&
5174                             ht_cap->mcs.rx_mask[2] == 0)
5175                                 ht_conf->single_chain_sufficient = true;
5176                         if (maxstreams <= 1)
5177                                 ht_conf->single_chain_sufficient = true;
5178                 } else {
5179                         /*
5180                          * If at all, this can only happen through a race
5181                          * when the AP disconnects us while we're still
5182                          * setting up the connection, in that case mac80211
5183                          * will soon tell us about that.
5184                          */
5185                         ht_conf->single_chain_sufficient = true;
5186                 }
5187                 rcu_read_unlock();
5188                 break;
5189         case NL80211_IFTYPE_ADHOC:
5190                 ht_conf->single_chain_sufficient = true;
5191                 break;
5192         default:
5193                 break;
5194         }
5195
5196         D_ASSOC("leave\n");
5197 }
5198
5199 static inline void
5200 il_set_no_assoc(struct il_priv *il, struct ieee80211_vif *vif)
5201 {
5202         /*
5203          * inform the ucode that there is no longer an
5204          * association and that no more packets should be
5205          * sent
5206          */
5207         il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
5208         il->staging.assoc_id = 0;
5209         il_commit_rxon(il);
5210 }
5211
5212 static void
5213 il_beacon_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
5214 {
5215         struct il_priv *il = hw->priv;
5216         unsigned long flags;
5217         __le64 timestamp;
5218         struct sk_buff *skb = ieee80211_beacon_get(hw, vif);
5219
5220         if (!skb)
5221                 return;
5222
5223         D_MAC80211("enter\n");
5224
5225         lockdep_assert_held(&il->mutex);
5226
5227         if (!il->beacon_enabled) {
5228                 IL_ERR("update beacon with no beaconing enabled\n");
5229                 dev_kfree_skb(skb);
5230                 return;
5231         }
5232
5233         spin_lock_irqsave(&il->lock, flags);
5234
5235         if (il->beacon_skb)
5236                 dev_kfree_skb(il->beacon_skb);
5237
5238         il->beacon_skb = skb;
5239
5240         timestamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
5241         il->timestamp = le64_to_cpu(timestamp);
5242
5243         D_MAC80211("leave\n");
5244         spin_unlock_irqrestore(&il->lock, flags);
5245
5246         if (!il_is_ready_rf(il)) {
5247                 D_MAC80211("leave - RF not ready\n");
5248                 return;
5249         }
5250
5251         il->ops->post_associate(il);
5252 }
5253
5254 void
5255 il_mac_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5256                         struct ieee80211_bss_conf *bss_conf, u32 changes)
5257 {
5258         struct il_priv *il = hw->priv;
5259         int ret;
5260
5261         mutex_lock(&il->mutex);
5262         D_MAC80211("enter: changes 0x%x\n", changes);
5263
5264         if (!il_is_alive(il)) {
5265                 D_MAC80211("leave - not alive\n");
5266                 mutex_unlock(&il->mutex);
5267                 return;
5268         }
5269
5270         if (changes & BSS_CHANGED_QOS) {
5271                 unsigned long flags;
5272
5273                 spin_lock_irqsave(&il->lock, flags);
5274                 il->qos_data.qos_active = bss_conf->qos;
5275                 il_update_qos(il);
5276                 spin_unlock_irqrestore(&il->lock, flags);
5277         }
5278
5279         if (changes & BSS_CHANGED_BEACON_ENABLED) {
5280                 /* FIXME: can we remove beacon_enabled ? */
5281                 if (vif->bss_conf.enable_beacon)
5282                         il->beacon_enabled = true;
5283                 else
5284                         il->beacon_enabled = false;
5285         }
5286
5287         if (changes & BSS_CHANGED_BSSID) {
5288                 D_MAC80211("BSSID %pM\n", bss_conf->bssid);
5289
5290                 /*
5291                  * If there is currently a HW scan going on in the background,
5292                  * then we need to cancel it, otherwise sometimes we are not
5293                  * able to authenticate (FIXME: why ?)
5294                  */
5295                 if (il_scan_cancel_timeout(il, 100)) {
5296                         D_MAC80211("leave - scan abort failed\n");
5297                         mutex_unlock(&il->mutex);
5298                         return;
5299                 }
5300
5301                 /* mac80211 only sets assoc when in STATION mode */
5302                 memcpy(il->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
5303
5304                 /* FIXME: currently needed in a few places */
5305                 memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
5306         }
5307
5308         /*
5309          * This needs to be after setting the BSSID in case
5310          * mac80211 decides to do both changes at once because
5311          * it will invoke post_associate.
5312          */
5313         if (vif->type == NL80211_IFTYPE_ADHOC && (changes & BSS_CHANGED_BEACON))
5314                 il_beacon_update(hw, vif);
5315
5316         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
5317                 D_MAC80211("ERP_PREAMBLE %d\n", bss_conf->use_short_preamble);
5318                 if (bss_conf->use_short_preamble)
5319                         il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
5320                 else
5321                         il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
5322         }
5323
5324         if (changes & BSS_CHANGED_ERP_CTS_PROT) {
5325                 D_MAC80211("ERP_CTS %d\n", bss_conf->use_cts_prot);
5326                 if (bss_conf->use_cts_prot && il->band != IEEE80211_BAND_5GHZ)
5327                         il->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
5328                 else
5329                         il->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
5330                 if (bss_conf->use_cts_prot)
5331                         il->staging.flags |= RXON_FLG_SELF_CTS_EN;
5332                 else
5333                         il->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
5334         }
5335
5336         if (changes & BSS_CHANGED_BASIC_RATES) {
5337                 /* XXX use this information
5338                  *
5339                  * To do that, remove code from il_set_rate() and put something
5340                  * like this here:
5341                  *
5342                  if (A-band)
5343                  il->staging.ofdm_basic_rates =
5344                  bss_conf->basic_rates;
5345                  else
5346                  il->staging.ofdm_basic_rates =
5347                  bss_conf->basic_rates >> 4;
5348                  il->staging.cck_basic_rates =
5349                  bss_conf->basic_rates & 0xF;
5350                  */
5351         }
5352
5353         if (changes & BSS_CHANGED_HT) {
5354                 il_ht_conf(il, vif);
5355
5356                 if (il->ops->set_rxon_chain)
5357                         il->ops->set_rxon_chain(il);
5358         }
5359
5360         if (changes & BSS_CHANGED_ASSOC) {
5361                 D_MAC80211("ASSOC %d\n", bss_conf->assoc);
5362                 if (bss_conf->assoc) {
5363                         il->timestamp = bss_conf->last_tsf;
5364
5365                         if (!il_is_rfkill(il))
5366                                 il->ops->post_associate(il);
5367                 } else
5368                         il_set_no_assoc(il, vif);
5369         }
5370
5371         if (changes && il_is_associated(il) && bss_conf->aid) {
5372                 D_MAC80211("Changes (%#x) while associated\n", changes);
5373                 ret = il_send_rxon_assoc(il);
5374                 if (!ret) {
5375                         /* Sync active_rxon with latest change. */
5376                         memcpy((void *)&il->active, &il->staging,
5377                                sizeof(struct il_rxon_cmd));
5378                 }
5379         }
5380
5381         if (changes & BSS_CHANGED_BEACON_ENABLED) {
5382                 if (vif->bss_conf.enable_beacon) {
5383                         memcpy(il->staging.bssid_addr, bss_conf->bssid,
5384                                ETH_ALEN);
5385                         memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
5386                         il->ops->config_ap(il);
5387                 } else
5388                         il_set_no_assoc(il, vif);
5389         }
5390
5391         if (changes & BSS_CHANGED_IBSS) {
5392                 ret = il->ops->manage_ibss_station(il, vif,
5393                                                    bss_conf->ibss_joined);
5394                 if (ret)
5395                         IL_ERR("failed to %s IBSS station %pM\n",
5396                                bss_conf->ibss_joined ? "add" : "remove",
5397                                bss_conf->bssid);
5398         }
5399
5400         D_MAC80211("leave\n");
5401         mutex_unlock(&il->mutex);
5402 }
5403 EXPORT_SYMBOL(il_mac_bss_info_changed);
5404
5405 irqreturn_t
5406 il_isr(int irq, void *data)
5407 {
5408         struct il_priv *il = data;
5409         u32 inta, inta_mask;
5410         u32 inta_fh;
5411         unsigned long flags;
5412         if (!il)
5413                 return IRQ_NONE;
5414
5415         spin_lock_irqsave(&il->lock, flags);
5416
5417         /* Disable (but don't clear!) interrupts here to avoid
5418          *    back-to-back ISRs and sporadic interrupts from our NIC.
5419          * If we have something to service, the tasklet will re-enable ints.
5420          * If we *don't* have something, we'll re-enable before leaving here. */
5421         inta_mask = _il_rd(il, CSR_INT_MASK);   /* just for debug */
5422         _il_wr(il, CSR_INT_MASK, 0x00000000);
5423
5424         /* Discover which interrupts are active/pending */
5425         inta = _il_rd(il, CSR_INT);
5426         inta_fh = _il_rd(il, CSR_FH_INT_STATUS);
5427
5428         /* Ignore interrupt if there's nothing in NIC to service.
5429          * This may be due to IRQ shared with another device,
5430          * or due to sporadic interrupts thrown from our NIC. */
5431         if (!inta && !inta_fh) {
5432                 D_ISR("Ignore interrupt, inta == 0, inta_fh == 0\n");
5433                 goto none;
5434         }
5435
5436         if (inta == 0xFFFFFFFF || (inta & 0xFFFFFFF0) == 0xa5a5a5a0) {
5437                 /* Hardware disappeared. It might have already raised
5438                  * an interrupt */
5439                 IL_WARN("HARDWARE GONE?? INTA == 0x%08x\n", inta);
5440                 goto unplugged;
5441         }
5442
5443         D_ISR("ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n", inta, inta_mask,
5444               inta_fh);
5445
5446         inta &= ~CSR_INT_BIT_SCD;
5447
5448         /* il_irq_tasklet() will service interrupts and re-enable them */
5449         if (likely(inta || inta_fh))
5450                 tasklet_schedule(&il->irq_tasklet);
5451
5452 unplugged:
5453         spin_unlock_irqrestore(&il->lock, flags);
5454         return IRQ_HANDLED;
5455
5456 none:
5457         /* re-enable interrupts here since we don't have anything to service. */
5458         /* only Re-enable if disabled by irq */
5459         if (test_bit(S_INT_ENABLED, &il->status))
5460                 il_enable_interrupts(il);
5461         spin_unlock_irqrestore(&il->lock, flags);
5462         return IRQ_NONE;
5463 }
5464 EXPORT_SYMBOL(il_isr);
5465
5466 /*
5467  *  il_tx_cmd_protection: Set rts/cts. 3945 and 4965 only share this
5468  *  function.
5469  */
5470 void
5471 il_tx_cmd_protection(struct il_priv *il, struct ieee80211_tx_info *info,
5472                      __le16 fc, __le32 *tx_flags)
5473 {
5474         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
5475                 *tx_flags |= TX_CMD_FLG_RTS_MSK;
5476                 *tx_flags &= ~TX_CMD_FLG_CTS_MSK;
5477                 *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
5478
5479                 if (!ieee80211_is_mgmt(fc))
5480                         return;
5481
5482                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
5483                 case cpu_to_le16(IEEE80211_STYPE_AUTH):
5484                 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
5485                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
5486                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
5487                         *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
5488                         *tx_flags |= TX_CMD_FLG_CTS_MSK;
5489                         break;
5490                 }
5491         } else if (info->control.rates[0].
5492                    flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
5493                 *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
5494                 *tx_flags |= TX_CMD_FLG_CTS_MSK;
5495                 *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
5496         }
5497 }
5498 EXPORT_SYMBOL(il_tx_cmd_protection);