drivers/net/wireless/rt2x00/rt2x00pci.c

   1 /*
   2         Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00pci
  23         Abstract: rt2x00 generic pci device routines.
  24  */
  25
  26 /*
  27  * Set enviroment defines for rt2x00.h
  28  */
  29 #define DRV_NAME "rt2x00pci"
  30
  31 #include <linux/dma-mapping.h>
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/pci.h>
  35
  36 #include "rt2x00.h"
  37 #include "rt2x00pci.h"
  38
  39 /*
  40  * Beacon handlers.
  41  */
  42 int rt2x00pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
  43                             struct ieee80211_tx_control *control)
  44 {
  45         struct rt2x00_dev *rt2x00dev = hw->priv;
  46         struct data_ring *ring =
  47             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
  48         struct data_entry *entry = rt2x00_get_data_entry(ring);
  49
  50         /*
  51          * Just in case mac80211 doesn't set this correctly,
  52          * but we need this queue set for the descriptor
  53          * initialization.
  54          */
  55         control->queue = IEEE80211_TX_QUEUE_BEACON;
  56
  57         /*
  58          * Update the beacon entry.
  59          */
  60         memcpy(entry->data_addr, skb->data, skb->len);
  61         rt2x00lib_write_tx_desc(rt2x00dev, entry->priv,
  62                                 (struct ieee80211_hdr *)skb->data,
  63                                 skb->len, control);
  64
  65         /*
  66          * Enable beacon generation.
  67          */
  68         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
  69
  70         return 0;
  71 }
  72 EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
  73
  74 /*
  75  * TX data handlers.
  76  */
  77 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
  78                             struct data_ring *ring, struct sk_buff *skb,
  79                             struct ieee80211_tx_control *control)
  80 {
  81         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
  82         struct data_entry *entry = rt2x00_get_data_entry(ring);
  83         struct data_desc *txd = entry->priv;
  84         u32 word;
  85
  86         if (rt2x00_ring_full(ring)) {
  87                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
  88                 return -EINVAL;
  89         }
  90
  91         rt2x00_desc_read(txd, 0, &word);
  92
  93         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  94             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
  95                 ERROR(rt2x00dev,
  96                       "Arrived at non-free entry in the non-full queue %d.\n"
  97                       "Please file bug report to %s.\n",
  98                       control->queue, DRV_PROJECT);
  99                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 100                 return -EINVAL;
 101         }
 102
 103         entry->skb = skb;
 104         memcpy(&entry->tx_status.control, control, sizeof(*control));
 105         memcpy(entry->data_addr, skb->data, skb->len);
 106         rt2x00lib_write_tx_desc(rt2x00dev, txd, ieee80211hdr,
 107                                 skb->len, control);
 108
 109         rt2x00_ring_index_inc(ring);
 110
 111         if (rt2x00_ring_full(ring))
 112                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 113
 114         return 0;
 115 }
 116 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
 117
 118 /*
 119  * RX data handlers.
 120  */
 121 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 122 {
 123         struct data_ring *ring = rt2x00dev->rx;
 124         struct data_entry *entry;
 125         struct data_desc *rxd;
 126         struct sk_buff *skb;
 127         u32 desc;
 128         int retval;
 129         int signal;
 130         int rssi;
 131         int ofdm;
 132         int size;
 133
 134         while (1) {
 135                 entry = rt2x00_get_data_entry(ring);
 136                 rxd = entry->priv;
 137                 rt2x00_desc_read(rxd, 0, &desc);
 138
 139                 if (rt2x00_get_field32(desc, RXD_ENTRY_OWNER_NIC))
 140                         break;
 141
 142                 retval = rt2x00dev->ops->lib->fill_rxdone(entry, &signal,
 143                                                           &rssi, &ofdm, &size);
 144                 if (retval)
 145                         goto skip_entry;
 146
 147                 /*
 148                  * Allocate the sk_buffer, initialize it and copy
 149                  * all data into it.
 150                  */
 151                 skb = dev_alloc_skb(size + NET_IP_ALIGN);
 152                 if (!skb)
 153                         return;
 154
 155                 skb_reserve(skb, NET_IP_ALIGN);
 156                 skb_put(skb, size);
 157                 memcpy(skb->data, entry->data_addr, size);
 158
 159                 /*
 160                  * Send the frame to rt2x00lib for further processing.
 161                  */
 162                 rt2x00lib_rxdone(entry, skb, signal, rssi, ofdm);
 163
 164 skip_entry:
 165                 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
 166                         rt2x00_set_field32(&desc, RXD_ENTRY_OWNER_NIC, 1);
 167                         rt2x00_desc_write(rxd, 0, desc);
 168                 }
 169
 170                 rt2x00_ring_index_inc(ring);
 171         }
 172 }
 173 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 174
 175 /*
 176  * Device initialization handlers.
 177  */
 178 #define priv_offset(__ring, __i)                                \
 179 ({                                                              \
 180         ring->data_addr + (i * ring->desc_size);                \
 181 })
 182
 183 #define data_addr_offset(__ring, __i)                           \
 184 ({                                                              \
 185         (__ring)->data_addr +                                   \
 186             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 187             ((__i) * (__ring)->data_size);                      \
 188 })
 189
 190 #define data_dma_offset(__ring, __i)                            \
 191 ({                                                              \
 192         (__ring)->data_dma +                                    \
 193             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 194             ((__i) * (__ring)->data_size);                      \
 195 })
 196
 197 static int rt2x00pci_alloc_dma(struct rt2x00_dev *rt2x00dev,
 198                                struct data_ring *ring)
 199 {
 200         unsigned int i;
 201
 202         /*
 203          * Allocate DMA memory for descriptor and buffer.
 204          */
 205         ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
 206                                                rt2x00_get_ring_size(ring),
 207                                                &ring->data_dma);
 208         if (!ring->data_addr)
 209                 return -ENOMEM;
 210
 211         /*
 212          * Initialize all ring entries to contain valid
 213          * addresses.
 214          */
 215         for (i = 0; i < ring->stats.limit; i++) {
 216                 ring->entry[i].priv = priv_offset(ring, i);
 217                 ring->entry[i].data_addr = data_addr_offset(ring, i);
 218                 ring->entry[i].data_dma = data_dma_offset(ring, i);
 219         }
 220
 221         return 0;
 222 }
 223
 224 static void rt2x00pci_free_dma(struct rt2x00_dev *rt2x00dev,
 225                                struct data_ring *ring)
 226 {
 227         if (ring->data_addr)
 228                 pci_free_consistent(rt2x00dev_pci(rt2x00dev),
 229                                     rt2x00_get_ring_size(ring),
 230                                     ring->data_addr, ring->data_dma);
 231         ring->data_addr = NULL;
 232 }
 233
 234 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 235 {
 236         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 237         struct data_ring *ring;
 238         int status;
 239
 240         /*
 241          * Allocate DMA
 242          */
 243         ring_for_each(rt2x00dev, ring) {
 244                 status = rt2x00pci_alloc_dma(rt2x00dev, ring);
 245                 if (status)
 246                         goto exit;
 247         }
 248
 249         /*
 250          * Register interrupt handler.
 251          */
 252         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 253                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 254         if (status) {
 255                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 256                       pci_dev->irq, status);
 257                 return status;
 258         }
 259
 260         return 0;
 261
 262 exit:
 263         rt2x00pci_uninitialize(rt2x00dev);
 264
 265         return status;
 266 }
 267 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 268
 269 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 270 {
 271         struct data_ring *ring;
 272
 273         /*
 274          * Free irq line.
 275          */
 276         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 277
 278         /*
 279          * Free DMA
 280          */
 281         ring_for_each(rt2x00dev, ring)
 282                 rt2x00pci_free_dma(rt2x00dev, ring);
 283 }
 284 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 285
 286 /*
 287  * PCI driver handlers.
 288  */
 289 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 290 {
 291         kfree(rt2x00dev->rf);
 292         rt2x00dev->rf = NULL;
 293
 294         kfree(rt2x00dev->eeprom);
 295         rt2x00dev->eeprom = NULL;
 296
 297         if (rt2x00dev->csr_addr) {
 298                 iounmap(rt2x00dev->csr_addr);
 299                 rt2x00dev->csr_addr = NULL;
 300         }
 301 }
 302
 303 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 304 {
 305         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 306
 307         rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
 308                                       pci_resource_len(pci_dev, 0));
 309         if (!rt2x00dev->csr_addr)
 310                 goto exit;
 311
 312         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 313         if (!rt2x00dev->eeprom)
 314                 goto exit;
 315
 316         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 317         if (!rt2x00dev->rf)
 318                 goto exit;
 319
 320         return 0;
 321
 322 exit:
 323         ERROR_PROBE("Failed to allocate registers.\n");
 324
 325         rt2x00pci_free_reg(rt2x00dev);
 326
 327         return -ENOMEM;
 328 }
 329
 330 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 331 {
 332         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 333         struct ieee80211_hw *hw;
 334         struct rt2x00_dev *rt2x00dev;
 335         int retval;
 336
 337         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 338         if (retval) {
 339                 ERROR_PROBE("PCI request regions failed.\n");
 340                 return retval;
 341         }
 342
 343         retval = pci_enable_device(pci_dev);
 344         if (retval) {
 345                 ERROR_PROBE("Enable device failed.\n");
 346                 goto exit_release_regions;
 347         }
 348
 349         pci_set_master(pci_dev);
 350
 351         if (pci_set_mwi(pci_dev))
 352                 ERROR_PROBE("MWI not available.\n");
 353
 354         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 355             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 356                 ERROR_PROBE("PCI DMA not supported.\n");
 357                 retval = -EIO;
 358                 goto exit_disable_device;
 359         }
 360
 361         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 362         if (!hw) {
 363                 ERROR_PROBE("Failed to allocate hardware.\n");
 364                 retval = -ENOMEM;
 365                 goto exit_disable_device;
 366         }
 367
 368         pci_set_drvdata(pci_dev, hw);
 369
 370         rt2x00dev = hw->priv;
 371         rt2x00dev->dev = pci_dev;
 372         rt2x00dev->ops = ops;
 373         rt2x00dev->hw = hw;
 374
 375         retval = rt2x00pci_alloc_reg(rt2x00dev);
 376         if (retval)
 377                 goto exit_free_device;
 378
 379         retval = rt2x00lib_probe_dev(rt2x00dev);
 380         if (retval)
 381                 goto exit_free_reg;
 382
 383         return 0;
 384
 385 exit_free_reg:
 386         rt2x00pci_free_reg(rt2x00dev);
 387
 388 exit_free_device:
 389         ieee80211_free_hw(hw);
 390
 391 exit_disable_device:
 392         if (retval != -EBUSY)
 393                 pci_disable_device(pci_dev);
 394
 395 exit_release_regions:
 396         pci_release_regions(pci_dev);
 397
 398         pci_set_drvdata(pci_dev, NULL);
 399
 400         return retval;
 401 }
 402 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 403
 404 void rt2x00pci_remove(struct pci_dev *pci_dev)
 405 {
 406         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 407         struct rt2x00_dev *rt2x00dev = hw->priv;
 408
 409         /*
 410          * Free all allocated data.
 411          */
 412         rt2x00lib_remove_dev(rt2x00dev);
 413         rt2x00pci_free_reg(rt2x00dev);
 414         ieee80211_free_hw(hw);
 415
 416         /*
 417          * Free the PCI device data.
 418          */
 419         pci_set_drvdata(pci_dev, NULL);
 420         pci_disable_device(pci_dev);
 421         pci_release_regions(pci_dev);
 422 }
 423 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 424
 425 #ifdef CONFIG_PM
 426 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 427 {
 428         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 429         struct rt2x00_dev *rt2x00dev = hw->priv;
 430         int retval;
 431
 432         retval = rt2x00lib_suspend(rt2x00dev, state);
 433         if (retval)
 434                 return retval;
 435
 436         rt2x00pci_free_reg(rt2x00dev);
 437
 438         pci_save_state(pci_dev);
 439         pci_disable_device(pci_dev);
 440         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 441 }
 442 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 443
 444 int rt2x00pci_resume(struct pci_dev *pci_dev)
 445 {
 446         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 447         struct rt2x00_dev *rt2x00dev = hw->priv;
 448         int retval;
 449
 450         if (pci_set_power_state(pci_dev, PCI_D0) ||
 451             pci_enable_device(pci_dev) ||
 452             pci_restore_state(pci_dev)) {
 453                 ERROR(rt2x00dev, "Failed to resume device.\n");
 454                 return -EIO;
 455         }
 456
 457         retval = rt2x00pci_alloc_reg(rt2x00dev);
 458         if (retval)
 459                 return retval;
 460
 461         retval = rt2x00lib_resume(rt2x00dev);
 462         if (retval)
 463                 goto exit_free_reg;
 464
 465         return 0;
 466
 467 exit_free_reg:
 468         rt2x00pci_free_reg(rt2x00dev);
 469
 470         return retval;
 471 }
 472 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 473 #endif /* CONFIG_PM */
 474
 475 /*
 476  * rt2x00pci module information.
 477  */
 478 MODULE_AUTHOR(DRV_PROJECT);
 479 MODULE_VERSION(DRV_VERSION);
 480 MODULE_DESCRIPTION("rt2x00 library");
 481 MODULE_LICENSE("GPL");