drivers/net/stmmac/dwmac100.c

   1 /*******************************************************************************
   2   This is the driver for the MAC 10/100 on-chip Ethernet controller
   3   currently tested on all the ST boards based on STb7109 and stx7200 SoCs.
   4
   5   DWC Ether MAC 10/100 Universal version 4.0 has been used for developing
   6   this code.
   7
   8   Copyright (C) 2007-2009  STMicroelectronics Ltd
   9
  10   This program is free software; you can redistribute it and/or modify it
  11   under the terms and conditions of the GNU General Public License,
  12   version 2, as published by the Free Software Foundation.
  13
  14   This program is distributed in the hope it will be useful, but WITHOUT
  15   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17   more details.
  18
  19   You should have received a copy of the GNU General Public License along with
  20   this program; if not, write to the Free Software Foundation, Inc.,
  21   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  22
  23   The full GNU General Public License is included in this distribution in
  24   the file called "COPYING".
  25
  26   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  27 *******************************************************************************/
  28
  29 #include <linux/crc32.h>
  30 #include <linux/mii.h>
  31 #include <linux/phy.h>
  32 #include <linux/slab.h>
  33
  34 #include "common.h"
  35 #include "dwmac100.h"
  36 #include "dwmac_dma.h"
  37
  38 #undef DWMAC100_DEBUG
  39 /*#define DWMAC100_DEBUG*/
  40 #ifdef DWMAC100_DEBUG
  41 #define DBG(fmt, args...)  printk(fmt, ## args)
  42 #else
  43 #define DBG(fmt, args...)  do { } while (0)
  44 #endif
  45
  46 static void dwmac100_core_init(unsigned long ioaddr)
  47 {
  48         u32 value = readl(ioaddr + MAC_CONTROL);
  49
  50         writel((value | MAC_CORE_INIT), ioaddr + MAC_CONTROL);
  51
  52 #ifdef STMMAC_VLAN_TAG_USED
  53         writel(ETH_P_8021Q, ioaddr + MAC_VLAN1);
  54 #endif
  55         return;
  56 }
  57
  58 static void dwmac100_dump_mac_regs(unsigned long ioaddr)
  59 {
  60         pr_info("\t----------------------------------------------\n"
  61                 "\t  DWMAC 100 CSR (base addr = 0x%8x)\n"
  62                 "\t----------------------------------------------\n",
  63                 (unsigned int)ioaddr);
  64         pr_info("\tcontrol reg (offset 0x%x): 0x%08x\n", MAC_CONTROL,
  65                 readl(ioaddr + MAC_CONTROL));
  66         pr_info("\taddr HI (offset 0x%x): 0x%08x\n ", MAC_ADDR_HIGH,
  67                 readl(ioaddr + MAC_ADDR_HIGH));
  68         pr_info("\taddr LO (offset 0x%x): 0x%08x\n", MAC_ADDR_LOW,
  69                 readl(ioaddr + MAC_ADDR_LOW));
  70         pr_info("\tmulticast hash HI (offset 0x%x): 0x%08x\n",
  71                 MAC_HASH_HIGH, readl(ioaddr + MAC_HASH_HIGH));
  72         pr_info("\tmulticast hash LO (offset 0x%x): 0x%08x\n",
  73                 MAC_HASH_LOW, readl(ioaddr + MAC_HASH_LOW));
  74         pr_info("\tflow control (offset 0x%x): 0x%08x\n",
  75                 MAC_FLOW_CTRL, readl(ioaddr + MAC_FLOW_CTRL));
  76         pr_info("\tVLAN1 tag (offset 0x%x): 0x%08x\n", MAC_VLAN1,
  77                 readl(ioaddr + MAC_VLAN1));
  78         pr_info("\tVLAN2 tag (offset 0x%x): 0x%08x\n", MAC_VLAN2,
  79                 readl(ioaddr + MAC_VLAN2));
  80         pr_info("\n\tMAC management counter registers\n");
  81         pr_info("\t MMC crtl (offset 0x%x): 0x%08x\n",
  82                 MMC_CONTROL, readl(ioaddr + MMC_CONTROL));
  83         pr_info("\t MMC High Interrupt (offset 0x%x): 0x%08x\n",
  84                 MMC_HIGH_INTR, readl(ioaddr + MMC_HIGH_INTR));
  85         pr_info("\t MMC Low Interrupt (offset 0x%x): 0x%08x\n",
  86                 MMC_LOW_INTR, readl(ioaddr + MMC_LOW_INTR));
  87         pr_info("\t MMC High Interrupt Mask (offset 0x%x): 0x%08x\n",
  88                 MMC_HIGH_INTR_MASK, readl(ioaddr + MMC_HIGH_INTR_MASK));
  89         pr_info("\t MMC Low Interrupt Mask (offset 0x%x): 0x%08x\n",
  90                 MMC_LOW_INTR_MASK, readl(ioaddr + MMC_LOW_INTR_MASK));
  91         return;
  92 }
  93
  94 static int dwmac100_dma_init(unsigned long ioaddr, int pbl, u32 dma_tx,
  95                            u32 dma_rx)
  96 {
  97         u32 value = readl(ioaddr + DMA_BUS_MODE);
  98         /* DMA SW reset */
  99         value |= DMA_BUS_MODE_SFT_RESET;
 100         writel(value, ioaddr + DMA_BUS_MODE);
 101         do {} while ((readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET));
 102
 103         /* Enable Application Access by writing to DMA CSR0 */
 104         writel(DMA_BUS_MODE_DEFAULT | (pbl << DMA_BUS_MODE_PBL_SHIFT),
 105                ioaddr + DMA_BUS_MODE);
 106
 107         /* Mask interrupts by writing to CSR7 */
 108         writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
 109
 110         /* The base address of the RX/TX descriptor lists must be written into
 111          * DMA CSR3 and CSR4, respectively. */
 112         writel(dma_tx, ioaddr + DMA_TX_BASE_ADDR);
 113         writel(dma_rx, ioaddr + DMA_RCV_BASE_ADDR);
 114
 115         return 0;
 116 }
 117
 118 /* Store and Forward capability is not used at all..
 119  * The transmit threshold can be programmed by
 120  * setting the TTC bits in the DMA control register.*/
 121 static void dwmac100_dma_operation_mode(unsigned long ioaddr, int txmode,
 122                                       int rxmode)
 123 {
 124         u32 csr6 = readl(ioaddr + DMA_CONTROL);
 125
 126         if (txmode <= 32)
 127                 csr6 |= DMA_CONTROL_TTC_32;
 128         else if (txmode <= 64)
 129                 csr6 |= DMA_CONTROL_TTC_64;
 130         else
 131                 csr6 |= DMA_CONTROL_TTC_128;
 132
 133         writel(csr6, ioaddr + DMA_CONTROL);
 134
 135         return;
 136 }
 137
 138 static void dwmac100_dump_dma_regs(unsigned long ioaddr)
 139 {
 140         int i;
 141
 142         DBG(KERN_DEBUG "DWMAC 100 DMA CSR \n");
 143         for (i = 0; i < 9; i++)
 144                 pr_debug("\t CSR%d (offset 0x%x): 0x%08x\n", i,
 145                        (DMA_BUS_MODE + i * 4),
 146                        readl(ioaddr + DMA_BUS_MODE + i * 4));
 147         DBG(KERN_DEBUG "\t CSR20 (offset 0x%x): 0x%08x\n",
 148             DMA_CUR_TX_BUF_ADDR, readl(ioaddr + DMA_CUR_TX_BUF_ADDR));
 149         DBG(KERN_DEBUG "\t CSR21 (offset 0x%x): 0x%08x\n",
 150             DMA_CUR_RX_BUF_ADDR, readl(ioaddr + DMA_CUR_RX_BUF_ADDR));
 151         return;
 152 }
 153
 154 /* DMA controller has two counters to track the number of
 155  * the receive missed frames. */
 156 static void dwmac100_dma_diagnostic_fr(void *data,
 157                                      struct stmmac_extra_stats *x,
 158                                      unsigned long ioaddr)
 159 {
 160         struct net_device_stats *stats = (struct net_device_stats *)data;
 161         u32 csr8 = readl(ioaddr + DMA_MISSED_FRAME_CTR);
 162
 163         if (unlikely(csr8)) {
 164                 if (csr8 & DMA_MISSED_FRAME_OVE) {
 165                         stats->rx_over_errors += 0x800;
 166                         x->rx_overflow_cntr += 0x800;
 167                 } else {
 168                         unsigned int ove_cntr;
 169                         ove_cntr = ((csr8 & DMA_MISSED_FRAME_OVE_CNTR) >> 17);
 170                         stats->rx_over_errors += ove_cntr;
 171                         x->rx_overflow_cntr += ove_cntr;
 172                 }
 173
 174                 if (csr8 & DMA_MISSED_FRAME_OVE_M) {
 175                         stats->rx_missed_errors += 0xffff;
 176                         x->rx_missed_cntr += 0xffff;
 177                 } else {
 178                         unsigned int miss_f = (csr8 & DMA_MISSED_FRAME_M_CNTR);
 179                         stats->rx_missed_errors += miss_f;
 180                         x->rx_missed_cntr += miss_f;
 181                 }
 182         }
 183         return;
 184 }
 185
 186 static int dwmac100_get_tx_frame_status(void *data,
 187                                       struct stmmac_extra_stats *x,
 188                                       struct dma_desc *p, unsigned long ioaddr)
 189 {
 190         int ret = 0;
 191         struct net_device_stats *stats = (struct net_device_stats *)data;
 192
 193         if (unlikely(p->des01.tx.error_summary)) {
 194                 if (unlikely(p->des01.tx.underflow_error)) {
 195                         x->tx_underflow++;
 196                         stats->tx_fifo_errors++;
 197                 }
 198                 if (unlikely(p->des01.tx.no_carrier)) {
 199                         x->tx_carrier++;
 200                         stats->tx_carrier_errors++;
 201                 }
 202                 if (unlikely(p->des01.tx.loss_carrier)) {
 203                         x->tx_losscarrier++;
 204                         stats->tx_carrier_errors++;
 205                 }
 206                 if (unlikely((p->des01.tx.excessive_deferral) ||
 207                              (p->des01.tx.excessive_collisions) ||
 208                              (p->des01.tx.late_collision)))
 209                         stats->collisions += p->des01.tx.collision_count;
 210                 ret = -1;
 211         }
 212         if (unlikely(p->des01.tx.heartbeat_fail)) {
 213                 x->tx_heartbeat++;
 214                 stats->tx_heartbeat_errors++;
 215                 ret = -1;
 216         }
 217         if (unlikely(p->des01.tx.deferred))
 218                 x->tx_deferred++;
 219
 220         return ret;
 221 }
 222
 223 static int dwmac100_get_tx_len(struct dma_desc *p)
 224 {
 225         return p->des01.tx.buffer1_size;
 226 }
 227
 228 /* This function verifies if each incoming frame has some errors
 229  * and, if required, updates the multicast statistics.
 230  * In case of success, it returns csum_none becasue the device
 231  * is not able to compute the csum in HW. */
 232 static int dwmac100_get_rx_frame_status(void *data,
 233                                       struct stmmac_extra_stats *x,
 234                                       struct dma_desc *p)
 235 {
 236         int ret = csum_none;
 237         struct net_device_stats *stats = (struct net_device_stats *)data;
 238
 239         if (unlikely(p->des01.rx.last_descriptor == 0)) {
 240                 pr_warning("dwmac100 Error: Oversized Ethernet "
 241                            "frame spanned multiple buffers\n");
 242                 stats->rx_length_errors++;
 243                 return discard_frame;
 244         }
 245
 246         if (unlikely(p->des01.rx.error_summary)) {
 247                 if (unlikely(p->des01.rx.descriptor_error))
 248                         x->rx_desc++;
 249                 if (unlikely(p->des01.rx.partial_frame_error))
 250                         x->rx_partial++;
 251                 if (unlikely(p->des01.rx.run_frame))
 252                         x->rx_runt++;
 253                 if (unlikely(p->des01.rx.frame_too_long))
 254                         x->rx_toolong++;
 255                 if (unlikely(p->des01.rx.collision)) {
 256                         x->rx_collision++;
 257                         stats->collisions++;
 258                 }
 259                 if (unlikely(p->des01.rx.crc_error)) {
 260                         x->rx_crc++;
 261                         stats->rx_crc_errors++;
 262                 }
 263                 ret = discard_frame;
 264         }
 265         if (unlikely(p->des01.rx.dribbling))
 266                 ret = discard_frame;
 267
 268         if (unlikely(p->des01.rx.length_error)) {
 269                 x->rx_length++;
 270                 ret = discard_frame;
 271         }
 272         if (unlikely(p->des01.rx.mii_error)) {
 273                 x->rx_mii++;
 274                 ret = discard_frame;
 275         }
 276         if (p->des01.rx.multicast_frame) {
 277                 x->rx_multicast++;
 278                 stats->multicast++;
 279         }
 280         return ret;
 281 }
 282
 283 static void dwmac100_irq_status(unsigned long ioaddr)
 284 {
 285         return;
 286 }
 287
 288 static void dwmac100_set_umac_addr(unsigned long ioaddr, unsigned char *addr,
 289                           unsigned int reg_n)
 290 {
 291         stmmac_set_mac_addr(ioaddr, addr, MAC_ADDR_HIGH, MAC_ADDR_LOW);
 292 }
 293
 294 static void dwmac100_get_umac_addr(unsigned long ioaddr, unsigned char *addr,
 295                           unsigned int reg_n)
 296 {
 297         stmmac_get_mac_addr(ioaddr, addr, MAC_ADDR_HIGH, MAC_ADDR_LOW);
 298 }
 299
 300 static void dwmac100_set_filter(struct net_device *dev)
 301 {
 302         unsigned long ioaddr = dev->base_addr;
 303         u32 value = readl(ioaddr + MAC_CONTROL);
 304
 305         if (dev->flags & IFF_PROMISC) {
 306                 value |= MAC_CONTROL_PR;
 307                 value &= ~(MAC_CONTROL_PM | MAC_CONTROL_IF | MAC_CONTROL_HO |
 308                            MAC_CONTROL_HP);
 309         } else if ((netdev_mc_count(dev) > HASH_TABLE_SIZE)
 310                    || (dev->flags & IFF_ALLMULTI)) {
 311                 value |= MAC_CONTROL_PM;
 312                 value &= ~(MAC_CONTROL_PR | MAC_CONTROL_IF | MAC_CONTROL_HO);
 313                 writel(0xffffffff, ioaddr + MAC_HASH_HIGH);
 314                 writel(0xffffffff, ioaddr + MAC_HASH_LOW);
 315         } else if (netdev_mc_empty(dev)) {      /* no multicast */
 316                 value &= ~(MAC_CONTROL_PM | MAC_CONTROL_PR | MAC_CONTROL_IF |
 317                            MAC_CONTROL_HO | MAC_CONTROL_HP);
 318         } else {
 319                 u32 mc_filter[2];
 320                 struct dev_mc_list *mclist;
 321
 322                 /* Perfect filter mode for physical address and Hash
 323                    filter for multicast */
 324                 value |= MAC_CONTROL_HP;
 325                 value &= ~(MAC_CONTROL_PM | MAC_CONTROL_PR |
 326                            MAC_CONTROL_IF | MAC_CONTROL_HO);
 327
 328                 memset(mc_filter, 0, sizeof(mc_filter));
 329                 netdev_for_each_mc_addr(mclist, dev) {
 330                         /* The upper 6 bits of the calculated CRC are used to
 331                          * index the contens of the hash table */
 332                         int bit_nr =
 333                             ether_crc(ETH_ALEN, mclist->dmi_addr) >> 26;
 334                         /* The most significant bit determines the register to
 335                          * use (H/L) while the other 5 bits determine the bit
 336                          * within the register. */
 337                         mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
 338                 }
 339                 writel(mc_filter[0], ioaddr + MAC_HASH_LOW);
 340                 writel(mc_filter[1], ioaddr + MAC_HASH_HIGH);
 341         }
 342
 343         writel(value, ioaddr + MAC_CONTROL);
 344
 345         DBG(KERN_INFO "%s: CTRL reg: 0x%08x Hash regs: "
 346             "HI 0x%08x, LO 0x%08x\n",
 347             __func__, readl(ioaddr + MAC_CONTROL),
 348             readl(ioaddr + MAC_HASH_HIGH), readl(ioaddr + MAC_HASH_LOW));
 349         return;
 350 }
 351
 352 static void dwmac100_flow_ctrl(unsigned long ioaddr, unsigned int duplex,
 353                              unsigned int fc, unsigned int pause_time)
 354 {
 355         unsigned int flow = MAC_FLOW_CTRL_ENABLE;
 356
 357         if (duplex)
 358                 flow |= (pause_time << MAC_FLOW_CTRL_PT_SHIFT);
 359         writel(flow, ioaddr + MAC_FLOW_CTRL);
 360
 361         return;
 362 }
 363
 364 /* No PMT module supported for this Ethernet Controller.
 365  * Tested on ST platforms only.
 366  */
 367 static void dwmac100_pmt(unsigned long ioaddr, unsigned long mode)
 368 {
 369         return;
 370 }
 371
 372 static void dwmac100_init_rx_desc(struct dma_desc *p, unsigned int ring_size,
 373                                 int disable_rx_ic)
 374 {
 375         int i;
 376         for (i = 0; i < ring_size; i++) {
 377                 p->des01.rx.own = 1;
 378                 p->des01.rx.buffer1_size = BUF_SIZE_2KiB - 1;
 379                 if (i == ring_size - 1)
 380                         p->des01.rx.end_ring = 1;
 381                 if (disable_rx_ic)
 382                         p->des01.rx.disable_ic = 1;
 383                 p++;
 384         }
 385         return;
 386 }
 387
 388 static void dwmac100_init_tx_desc(struct dma_desc *p, unsigned int ring_size)
 389 {
 390         int i;
 391         for (i = 0; i < ring_size; i++) {
 392                 p->des01.tx.own = 0;
 393                 if (i == ring_size - 1)
 394                         p->des01.tx.end_ring = 1;
 395                 p++;
 396         }
 397         return;
 398 }
 399
 400 static int dwmac100_get_tx_owner(struct dma_desc *p)
 401 {
 402         return p->des01.tx.own;
 403 }
 404
 405 static int dwmac100_get_rx_owner(struct dma_desc *p)
 406 {
 407         return p->des01.rx.own;
 408 }
 409
 410 static void dwmac100_set_tx_owner(struct dma_desc *p)
 411 {
 412         p->des01.tx.own = 1;
 413 }
 414
 415 static void dwmac100_set_rx_owner(struct dma_desc *p)
 416 {
 417         p->des01.rx.own = 1;
 418 }
 419
 420 static int dwmac100_get_tx_ls(struct dma_desc *p)
 421 {
 422         return p->des01.tx.last_segment;
 423 }
 424
 425 static void dwmac100_release_tx_desc(struct dma_desc *p)
 426 {
 427         int ter = p->des01.tx.end_ring;
 428
 429         /* clean field used within the xmit */
 430         p->des01.tx.first_segment = 0;
 431         p->des01.tx.last_segment = 0;
 432         p->des01.tx.buffer1_size = 0;
 433
 434         /* clean status reported */
 435         p->des01.tx.error_summary = 0;
 436         p->des01.tx.underflow_error = 0;
 437         p->des01.tx.no_carrier = 0;
 438         p->des01.tx.loss_carrier = 0;
 439         p->des01.tx.excessive_deferral = 0;
 440         p->des01.tx.excessive_collisions = 0;
 441         p->des01.tx.late_collision = 0;
 442         p->des01.tx.heartbeat_fail = 0;
 443         p->des01.tx.deferred = 0;
 444
 445         /* set termination field */
 446         p->des01.tx.end_ring = ter;
 447
 448         return;
 449 }
 450
 451 static void dwmac100_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 452                                    int csum_flag)
 453 {
 454         p->des01.tx.first_segment = is_fs;
 455         p->des01.tx.buffer1_size = len;
 456 }
 457
 458 static void dwmac100_clear_tx_ic(struct dma_desc *p)
 459 {
 460         p->des01.tx.interrupt = 0;
 461 }
 462
 463 static void dwmac100_close_tx_desc(struct dma_desc *p)
 464 {
 465         p->des01.tx.last_segment = 1;
 466         p->des01.tx.interrupt = 1;
 467 }
 468
 469 static int dwmac100_get_rx_frame_len(struct dma_desc *p)
 470 {
 471         return p->des01.rx.frame_length;
 472 }
 473
 474 struct stmmac_ops dwmac100_ops = {
 475         .core_init = dwmac100_core_init,
 476         .dump_regs = dwmac100_dump_mac_regs,
 477         .host_irq_status = dwmac100_irq_status,
 478         .set_filter = dwmac100_set_filter,
 479         .flow_ctrl = dwmac100_flow_ctrl,
 480         .pmt = dwmac100_pmt,
 481         .set_umac_addr = dwmac100_set_umac_addr,
 482         .get_umac_addr = dwmac100_get_umac_addr,
 483 };
 484
 485 struct stmmac_dma_ops dwmac100_dma_ops = {
 486         .init = dwmac100_dma_init,
 487         .dump_regs = dwmac100_dump_dma_regs,
 488         .dma_mode = dwmac100_dma_operation_mode,
 489         .dma_diagnostic_fr = dwmac100_dma_diagnostic_fr,
 490         .enable_dma_transmission = dwmac_enable_dma_transmission,
 491         .enable_dma_irq = dwmac_enable_dma_irq,
 492         .disable_dma_irq = dwmac_disable_dma_irq,
 493         .start_tx = dwmac_dma_start_tx,
 494         .stop_tx = dwmac_dma_stop_tx,
 495         .start_rx = dwmac_dma_start_rx,
 496         .stop_rx = dwmac_dma_stop_rx,
 497         .dma_interrupt = dwmac_dma_interrupt,
 498 };
 499
 500 struct stmmac_desc_ops dwmac100_desc_ops = {
 501         .tx_status = dwmac100_get_tx_frame_status,
 502         .rx_status = dwmac100_get_rx_frame_status,
 503         .get_tx_len = dwmac100_get_tx_len,
 504         .init_rx_desc = dwmac100_init_rx_desc,
 505         .init_tx_desc = dwmac100_init_tx_desc,
 506         .get_tx_owner = dwmac100_get_tx_owner,
 507         .get_rx_owner = dwmac100_get_rx_owner,
 508         .release_tx_desc = dwmac100_release_tx_desc,
 509         .prepare_tx_desc = dwmac100_prepare_tx_desc,
 510         .clear_tx_ic = dwmac100_clear_tx_ic,
 511         .close_tx_desc = dwmac100_close_tx_desc,
 512         .get_tx_ls = dwmac100_get_tx_ls,
 513         .set_tx_owner = dwmac100_set_tx_owner,
 514         .set_rx_owner = dwmac100_set_rx_owner,
 515         .get_rx_frame_len = dwmac100_get_rx_frame_len,
 516 };
 517
 518 struct mac_device_info *dwmac100_setup(unsigned long ioaddr)
 519 {
 520         struct mac_device_info *mac;
 521
 522         mac = kzalloc(sizeof(const struct mac_device_info), GFP_KERNEL);
 523
 524         pr_info("\tDWMAC100\n");
 525
 526         mac->mac = &dwmac100_ops;
 527         mac->desc = &dwmac100_desc_ops;
 528         mac->dma = &dwmac100_dma_ops;
 529
 530         mac->pmt = PMT_NOT_SUPPORTED;
 531         mac->link.port = MAC_CONTROL_PS;
 532         mac->link.duplex = MAC_CONTROL_F;
 533         mac->link.speed = 0;
 534         mac->mii.addr = MAC_MII_ADDR;
 535         mac->mii.data = MAC_MII_DATA;
 536
 537         return mac;
 538 }