target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c

   1 /*
   2  *  Atheros AR71xx built-in ethernet mac driver
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  Based on Atheros' AG7100 driver
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #include "ag71xx.h"
  15
  16 #define AG71XX_DEFAULT_MSG_ENABLE       \
  17         (NETIF_MSG_DRV                  \
  18         | NETIF_MSG_PROBE               \
  19         | NETIF_MSG_LINK                \
  20         | NETIF_MSG_TIMER               \
  21         | NETIF_MSG_IFDOWN              \
  22         | NETIF_MSG_IFUP                \
  23         | NETIF_MSG_RX_ERR              \
  24         | NETIF_MSG_TX_ERR)
  25
  26 static int ag71xx_msg_level = -1;
  27
  28 module_param_named(msg_level, ag71xx_msg_level, int, 0);
  29 MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
  30
  31 static void ag71xx_dump_dma_regs(struct ag71xx *ag)
  32 {
  33         DBG("%s: dma_tx_ctrl=%08x, dma_tx_desc=%08x, dma_tx_status=%08x\n",
  34                 ag->dev->name,
  35                 ag71xx_rr(ag, AG71XX_REG_TX_CTRL),
  36                 ag71xx_rr(ag, AG71XX_REG_TX_DESC),
  37                 ag71xx_rr(ag, AG71XX_REG_TX_STATUS));
  38
  39         DBG("%s: dma_rx_ctrl=%08x, dma_rx_desc=%08x, dma_rx_status=%08x\n",
  40                 ag->dev->name,
  41                 ag71xx_rr(ag, AG71XX_REG_RX_CTRL),
  42                 ag71xx_rr(ag, AG71XX_REG_RX_DESC),
  43                 ag71xx_rr(ag, AG71XX_REG_RX_STATUS));
  44 }
  45
  46 static void ag71xx_dump_regs(struct ag71xx *ag)
  47 {
  48         DBG("%s: mac_cfg1=%08x, mac_cfg2=%08x, ipg=%08x, hdx=%08x, mfl=%08x\n",
  49                 ag->dev->name,
  50                 ag71xx_rr(ag, AG71XX_REG_MAC_CFG1),
  51                 ag71xx_rr(ag, AG71XX_REG_MAC_CFG2),
  52                 ag71xx_rr(ag, AG71XX_REG_MAC_IPG),
  53                 ag71xx_rr(ag, AG71XX_REG_MAC_HDX),
  54                 ag71xx_rr(ag, AG71XX_REG_MAC_MFL));
  55         DBG("%s: mac_ifctl=%08x, mac_addr1=%08x, mac_addr2=%08x\n",
  56                 ag->dev->name,
  57                 ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL),
  58                 ag71xx_rr(ag, AG71XX_REG_MAC_ADDR1),
  59                 ag71xx_rr(ag, AG71XX_REG_MAC_ADDR2));
  60         DBG("%s: fifo_cfg0=%08x, fifo_cfg1=%08x, fifo_cfg2=%08x\n",
  61                 ag->dev->name,
  62                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG0),
  63                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG1),
  64                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG2));
  65         DBG("%s: fifo_cfg3=%08x, fifo_cfg4=%08x, fifo_cfg5=%08x\n",
  66                 ag->dev->name,
  67                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG3),
  68                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG4),
  69                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5));
  70 }
  71
  72 static inline void ag71xx_dump_intr(struct ag71xx *ag, char *label, u32 intr)
  73 {
  74         DBG("%s: %s intr=%08x %s%s%s%s%s%s\n",
  75                 ag->dev->name, label, intr,
  76                 (intr & AG71XX_INT_TX_PS) ? "TXPS " : "",
  77                 (intr & AG71XX_INT_TX_UR) ? "TXUR " : "",
  78                 (intr & AG71XX_INT_TX_BE) ? "TXBE " : "",
  79                 (intr & AG71XX_INT_RX_PR) ? "RXPR " : "",
  80                 (intr & AG71XX_INT_RX_OF) ? "RXOF " : "",
  81                 (intr & AG71XX_INT_RX_BE) ? "RXBE " : "");
  82 }
  83
  84 static void ag71xx_ring_free(struct ag71xx_ring *ring)
  85 {
  86         kfree(ring->buf);
  87
  88         if (ring->descs_cpu)
  89                 dma_free_coherent(NULL, ring->size * ring->desc_size,
  90                                   ring->descs_cpu, ring->descs_dma);
  91 }
  92
  93 static int ag71xx_ring_alloc(struct ag71xx_ring *ring)
  94 {
  95         int err;
  96         int i;
  97
  98         ring->desc_size = sizeof(struct ag71xx_desc);
  99         if (ring->desc_size % cache_line_size()) {
 100                 DBG("ag71xx: ring %p, desc size %u rounded to %u\n",
 101                         ring, ring->desc_size,
 102                         roundup(ring->desc_size, cache_line_size()));
 103                 ring->desc_size = roundup(ring->desc_size, cache_line_size());
 104         }
 105
 106         ring->descs_cpu = dma_alloc_coherent(NULL, ring->size * ring->desc_size,
 107                                              &ring->descs_dma, GFP_ATOMIC);
 108         if (!ring->descs_cpu) {
 109                 err = -ENOMEM;
 110                 goto err;
 111         }
 112
 113
 114         ring->buf = kzalloc(ring->size * sizeof(*ring->buf), GFP_KERNEL);
 115         if (!ring->buf) {
 116                 err = -ENOMEM;
 117                 goto err;
 118         }
 119
 120         for (i = 0; i < ring->size; i++) {
 121                 int idx = i * ring->desc_size;
 122                 ring->buf[i].desc = (struct ag71xx_desc *)&ring->descs_cpu[idx];
 123                 DBG("ag71xx: ring %p, desc %d at %p\n",
 124                         ring, i, ring->buf[i].desc);
 125         }
 126
 127         return 0;
 128
 129 err:
 130         return err;
 131 }
 132
 133 static void ag71xx_ring_tx_clean(struct ag71xx *ag)
 134 {
 135         struct ag71xx_ring *ring = &ag->tx_ring;
 136         struct net_device *dev = ag->dev;
 137
 138         while (ring->curr != ring->dirty) {
 139                 u32 i = ring->dirty % ring->size;
 140
 141                 if (!ag71xx_desc_empty(ring->buf[i].desc)) {
 142                         ring->buf[i].desc->ctrl = 0;
 143                         dev->stats.tx_errors++;
 144                 }
 145
 146                 if (ring->buf[i].skb)
 147                         dev_kfree_skb_any(ring->buf[i].skb);
 148
 149                 ring->buf[i].skb = NULL;
 150
 151                 ring->dirty++;
 152         }
 153
 154         /* flush descriptors */
 155         wmb();
 156
 157 }
 158
 159 static void ag71xx_ring_tx_init(struct ag71xx *ag)
 160 {
 161         struct ag71xx_ring *ring = &ag->tx_ring;
 162         int i;
 163
 164         for (i = 0; i < ring->size; i++) {
 165                 ring->buf[i].desc->next = (u32) (ring->descs_dma +
 166                         ring->desc_size * ((i + 1) % ring->size));
 167
 168                 ring->buf[i].desc->ctrl = DESC_EMPTY;
 169                 ring->buf[i].skb = NULL;
 170         }
 171
 172         /* flush descriptors */
 173         wmb();
 174
 175         ring->curr = 0;
 176         ring->dirty = 0;
 177 }
 178
 179 static void ag71xx_ring_rx_clean(struct ag71xx *ag)
 180 {
 181         struct ag71xx_ring *ring = &ag->rx_ring;
 182         int i;
 183
 184         if (!ring->buf)
 185                 return;
 186
 187         for (i = 0; i < ring->size; i++)
 188                 if (ring->buf[i].skb) {
 189                         dma_unmap_single(&ag->dev->dev, ring->buf[i].dma_addr,
 190                                          AG71XX_RX_PKT_SIZE, DMA_FROM_DEVICE);
 191                         kfree_skb(ring->buf[i].skb);
 192                 }
 193 }
 194
 195 static int ag71xx_rx_reserve(struct ag71xx *ag)
 196 {
 197         int reserve = 0;
 198
 199         if (ag71xx_get_pdata(ag)->is_ar724x) {
 200                 if (!ag71xx_has_ar8216(ag))
 201                         reserve = 2;
 202
 203                 if (ag->phy_dev)
 204                         reserve += 4 - (ag->phy_dev->pkt_align % 4);
 205
 206                 reserve %= 4;
 207         }
 208
 209         return reserve + AG71XX_RX_PKT_RESERVE;
 210 }
 211
 212
 213 static int ag71xx_ring_rx_init(struct ag71xx *ag)
 214 {
 215         struct ag71xx_ring *ring = &ag->rx_ring;
 216         unsigned int reserve = ag71xx_rx_reserve(ag);
 217         unsigned int i;
 218         int ret;
 219
 220         ret = 0;
 221         for (i = 0; i < ring->size; i++) {
 222                 ring->buf[i].desc->next = (u32) (ring->descs_dma +
 223                         ring->desc_size * ((i + 1) % ring->size));
 224
 225                 DBG("ag71xx: RX desc at %p, next is %08x\n",
 226                         ring->buf[i].desc,
 227                         ring->buf[i].desc->next);
 228         }
 229
 230         for (i = 0; i < ring->size; i++) {
 231                 struct sk_buff *skb;
 232                 dma_addr_t dma_addr;
 233
 234                 skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE + reserve);
 235                 if (!skb) {
 236                         ret = -ENOMEM;
 237                         break;
 238                 }
 239
 240                 skb->dev = ag->dev;
 241                 skb_reserve(skb, reserve);
 242
 243                 dma_addr = dma_map_single(&ag->dev->dev, skb->data,
 244                                           AG71XX_RX_PKT_SIZE,
 245                                           DMA_FROM_DEVICE);
 246                 ring->buf[i].skb = skb;
 247                 ring->buf[i].dma_addr = dma_addr;
 248                 ring->buf[i].desc->data = (u32) dma_addr;
 249                 ring->buf[i].desc->ctrl = DESC_EMPTY;
 250         }
 251
 252         /* flush descriptors */
 253         wmb();
 254
 255         ring->curr = 0;
 256         ring->dirty = 0;
 257
 258         return ret;
 259 }
 260
 261 static int ag71xx_ring_rx_refill(struct ag71xx *ag)
 262 {
 263         struct ag71xx_ring *ring = &ag->rx_ring;
 264         unsigned int reserve = ag71xx_rx_reserve(ag);
 265         unsigned int count;
 266
 267         count = 0;
 268         for (; ring->curr - ring->dirty > 0; ring->dirty++) {
 269                 unsigned int i;
 270
 271                 i = ring->dirty % ring->size;
 272
 273                 if (ring->buf[i].skb == NULL) {
 274                         dma_addr_t dma_addr;
 275                         struct sk_buff *skb;
 276
 277                         skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE + reserve);
 278                         if (skb == NULL)
 279                                 break;
 280
 281                         skb_reserve(skb, reserve);
 282                         skb->dev = ag->dev;
 283
 284                         dma_addr = dma_map_single(&ag->dev->dev, skb->data,
 285                                                   AG71XX_RX_PKT_SIZE,
 286                                                   DMA_FROM_DEVICE);
 287
 288                         ring->buf[i].skb = skb;
 289                         ring->buf[i].dma_addr = dma_addr;
 290                         ring->buf[i].desc->data = (u32) dma_addr;
 291                 }
 292
 293                 ring->buf[i].desc->ctrl = DESC_EMPTY;
 294                 count++;
 295         }
 296
 297         /* flush descriptors */
 298         wmb();
 299
 300         DBG("%s: %u rx descriptors refilled\n", ag->dev->name, count);
 301
 302         return count;
 303 }
 304
 305 static int ag71xx_rings_init(struct ag71xx *ag)
 306 {
 307         int ret;
 308
 309         ret = ag71xx_ring_alloc(&ag->tx_ring);
 310         if (ret)
 311                 return ret;
 312
 313         ag71xx_ring_tx_init(ag);
 314
 315         ret = ag71xx_ring_alloc(&ag->rx_ring);
 316         if (ret)
 317                 return ret;
 318
 319         ret = ag71xx_ring_rx_init(ag);
 320         return ret;
 321 }
 322
 323 static void ag71xx_rings_cleanup(struct ag71xx *ag)
 324 {
 325         ag71xx_ring_rx_clean(ag);
 326         ag71xx_ring_free(&ag->rx_ring);
 327
 328         ag71xx_ring_tx_clean(ag);
 329         ag71xx_ring_free(&ag->tx_ring);
 330 }
 331
 332 static unsigned char *ag71xx_speed_str(struct ag71xx *ag)
 333 {
 334         switch (ag->speed) {
 335         case SPEED_1000:
 336                 return "1000";
 337         case SPEED_100:
 338                 return "100";
 339         case SPEED_10:
 340                 return "10";
 341         }
 342
 343         return "?";
 344 }
 345
 346 static void ag71xx_dma_reset(struct ag71xx *ag)
 347 {
 348         u32 val;
 349         int i;
 350
 351         ag71xx_dump_dma_regs(ag);
 352
 353         /* stop RX and TX */
 354         ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
 355         ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
 356
 357         /*
 358          * give the hardware some time to really stop all rx/tx activity
 359          * clearing the descriptors too early causes random memory corruption
 360          */
 361         mdelay(1);
 362
 363         /* clear descriptor addresses */
 364         ag71xx_wr(ag, AG71XX_REG_TX_DESC, 0);
 365         ag71xx_wr(ag, AG71XX_REG_RX_DESC, 0);
 366
 367         /* clear pending RX/TX interrupts */
 368         for (i = 0; i < 256; i++) {
 369                 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
 370                 ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
 371         }
 372
 373         /* clear pending errors */
 374         ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE | RX_STATUS_OF);
 375         ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE | TX_STATUS_UR);
 376
 377         val = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
 378         if (val)
 379                 printk(KERN_ALERT "%s: unable to clear DMA Rx status: %08x\n",
 380                         ag->dev->name, val);
 381
 382         val = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
 383
 384         /* mask out reserved bits */
 385         val &= ~0xff000000;
 386
 387         if (val)
 388                 printk(KERN_ALERT "%s: unable to clear DMA Tx status: %08x\n",
 389                         ag->dev->name, val);
 390
 391         ag71xx_dump_dma_regs(ag);
 392 }
 393
 394 static void ag71xx_hw_start(struct ag71xx *ag)
 395 {
 396         /* start RX engine */
 397         ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
 398
 399         /* enable interrupts */
 400         ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, AG71XX_INT_INIT);
 401 }
 402
 403 static void ag71xx_hw_stop(struct ag71xx *ag)
 404 {
 405         /* disable all interrupts */
 406         ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, 0);
 407
 408         ag71xx_dma_reset(ag);
 409 }
 410
 411 void ag71xx_link_adjust(struct ag71xx *ag)
 412 {
 413         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 414         u32 cfg2;
 415         u32 ifctl;
 416         u32 fifo5;
 417         u32 mii_speed;
 418
 419         if (!ag->link) {
 420                 ag71xx_hw_stop(ag);
 421                 netif_carrier_off(ag->dev);
 422                 if (netif_msg_link(ag))
 423                         printk(KERN_INFO "%s: link down\n", ag->dev->name);
 424                 return;
 425         }
 426
 427         cfg2 = ag71xx_rr(ag, AG71XX_REG_MAC_CFG2);
 428         cfg2 &= ~(MAC_CFG2_IF_1000 | MAC_CFG2_IF_10_100 | MAC_CFG2_FDX);
 429         cfg2 |= (ag->duplex) ? MAC_CFG2_FDX : 0;
 430
 431         ifctl = ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL);
 432         ifctl &= ~(MAC_IFCTL_SPEED);
 433
 434         fifo5 = ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5);
 435         fifo5 &= ~FIFO_CFG5_BM;
 436
 437         switch (ag->speed) {
 438         case SPEED_1000:
 439                 mii_speed =  MII_CTRL_SPEED_1000;
 440                 cfg2 |= MAC_CFG2_IF_1000;
 441                 fifo5 |= FIFO_CFG5_BM;
 442                 break;
 443         case SPEED_100:
 444                 mii_speed = MII_CTRL_SPEED_100;
 445                 cfg2 |= MAC_CFG2_IF_10_100;
 446                 ifctl |= MAC_IFCTL_SPEED;
 447                 break;
 448         case SPEED_10:
 449                 mii_speed = MII_CTRL_SPEED_10;
 450                 cfg2 |= MAC_CFG2_IF_10_100;
 451                 break;
 452         default:
 453                 BUG();
 454                 return;
 455         }
 456
 457         if (pdata->is_ar91xx)
 458                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, 0x00780fff);
 459         else if (pdata->is_ar724x)
 460                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, pdata->fifo_cfg3);
 461         else
 462                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, 0x008001ff);
 463
 464         if (pdata->set_pll)
 465                 pdata->set_pll(ag->speed);
 466
 467         ag71xx_mii_ctrl_set_speed(ag, mii_speed);
 468
 469         ag71xx_wr(ag, AG71XX_REG_MAC_CFG2, cfg2);
 470         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5);
 471         ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl);
 472
 473         ag71xx_hw_start(ag);
 474
 475         netif_carrier_on(ag->dev);
 476         if (netif_msg_link(ag))
 477                 printk(KERN_INFO "%s: link up (%sMbps/%s duplex)\n",
 478                         ag->dev->name,
 479                         ag71xx_speed_str(ag),
 480                         (DUPLEX_FULL == ag->duplex) ? "Full" : "Half");
 481
 482         DBG("%s: fifo_cfg0=%#x, fifo_cfg1=%#x, fifo_cfg2=%#x\n",
 483                 ag->dev->name,
 484                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG0),
 485                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG1),
 486                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG2));
 487
 488         DBG("%s: fifo_cfg3=%#x, fifo_cfg4=%#x, fifo_cfg5=%#x\n",
 489                 ag->dev->name,
 490                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG3),
 491                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG4),
 492                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5));
 493
 494         DBG("%s: mac_cfg2=%#x, mac_ifctl=%#x, mii_ctrl=%#x\n",
 495                 ag->dev->name,
 496                 ag71xx_rr(ag, AG71XX_REG_MAC_CFG2),
 497                 ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL),
 498                 ag71xx_mii_ctrl_rr(ag));
 499 }
 500
 501 static void ag71xx_hw_set_macaddr(struct ag71xx *ag, unsigned char *mac)
 502 {
 503         u32 t;
 504
 505         t = (((u32) mac[5]) << 24) | (((u32) mac[4]) << 16)
 506           | (((u32) mac[3]) << 8) | ((u32) mac[2]);
 507
 508         ag71xx_wr(ag, AG71XX_REG_MAC_ADDR1, t);
 509
 510         t = (((u32) mac[1]) << 24) | (((u32) mac[0]) << 16);
 511         ag71xx_wr(ag, AG71XX_REG_MAC_ADDR2, t);
 512 }
 513
 514 #define MAC_CFG1_INIT   (MAC_CFG1_RXE | MAC_CFG1_TXE | \
 515                          MAC_CFG1_SRX | MAC_CFG1_STX)
 516
 517 #define FIFO_CFG0_INIT  (FIFO_CFG0_ALL << FIFO_CFG0_ENABLE_SHIFT)
 518
 519 #define FIFO_CFG4_INIT  (FIFO_CFG4_DE | FIFO_CFG4_DV | FIFO_CFG4_FC | \
 520                          FIFO_CFG4_CE | FIFO_CFG4_CR | FIFO_CFG4_LM | \
 521                          FIFO_CFG4_LO | FIFO_CFG4_OK | FIFO_CFG4_MC | \
 522                          FIFO_CFG4_BC | FIFO_CFG4_DR | FIFO_CFG4_LE | \
 523                          FIFO_CFG4_CF | FIFO_CFG4_PF | FIFO_CFG4_UO | \
 524                          FIFO_CFG4_VT)
 525
 526 #define FIFO_CFG5_INIT  (FIFO_CFG5_DE | FIFO_CFG5_DV | FIFO_CFG5_FC | \
 527                          FIFO_CFG5_CE | FIFO_CFG5_LO | FIFO_CFG5_OK | \
 528                          FIFO_CFG5_MC | FIFO_CFG5_BC | FIFO_CFG5_DR | \
 529                          FIFO_CFG5_CF | FIFO_CFG5_PF | FIFO_CFG5_VT | \
 530                          FIFO_CFG5_LE | FIFO_CFG5_FT | FIFO_CFG5_16 | \
 531                          FIFO_CFG5_17 | FIFO_CFG5_SF)
 532
 533 static void ag71xx_hw_init(struct ag71xx *ag)
 534 {
 535         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 536
 537         ag71xx_sb(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_SR);
 538         udelay(20);
 539
 540         ar71xx_device_stop(pdata->reset_bit);
 541         mdelay(100);
 542         ar71xx_device_start(pdata->reset_bit);
 543         mdelay(100);
 544
 545         /* setup MAC configuration registers */
 546         ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_INIT);
 547
 548         ag71xx_sb(ag, AG71XX_REG_MAC_CFG2,
 549                   MAC_CFG2_PAD_CRC_EN | MAC_CFG2_LEN_CHECK);
 550
 551         /* setup max frame length */
 552         ag71xx_wr(ag, AG71XX_REG_MAC_MFL, AG71XX_TX_MTU_LEN);
 553
 554         /* setup MII interface type */
 555         ag71xx_mii_ctrl_set_if(ag, pdata->mii_if);
 556
 557         /* setup FIFO configuration registers */
 558         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG0, FIFO_CFG0_INIT);
 559         if (pdata->is_ar724x) {
 560                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, pdata->fifo_cfg1);
 561                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, pdata->fifo_cfg2);
 562         } else {
 563                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, 0x0fff0000);
 564                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, 0x00001fff);
 565         }
 566         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG4, FIFO_CFG4_INIT);
 567         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, FIFO_CFG5_INIT);
 568
 569         ag71xx_dma_reset(ag);
 570 }
 571
 572 static int ag71xx_open(struct net_device *dev)
 573 {
 574         struct ag71xx *ag = netdev_priv(dev);
 575         int ret;
 576
 577         ret = ag71xx_rings_init(ag);
 578         if (ret)
 579                 goto err;
 580
 581         napi_enable(&ag->napi);
 582
 583         netif_carrier_off(dev);
 584         ag71xx_phy_start(ag);
 585
 586         ag71xx_wr(ag, AG71XX_REG_TX_DESC, ag->tx_ring.descs_dma);
 587         ag71xx_wr(ag, AG71XX_REG_RX_DESC, ag->rx_ring.descs_dma);
 588
 589         ag71xx_hw_set_macaddr(ag, dev->dev_addr);
 590
 591         netif_start_queue(dev);
 592
 593         return 0;
 594
 595 err:
 596         ag71xx_rings_cleanup(ag);
 597         return ret;
 598 }
 599
 600 static int ag71xx_stop(struct net_device *dev)
 601 {
 602         struct ag71xx *ag = netdev_priv(dev);
 603         unsigned long flags;
 604
 605         netif_carrier_off(dev);
 606         ag71xx_phy_stop(ag);
 607
 608         spin_lock_irqsave(&ag->lock, flags);
 609
 610         netif_stop_queue(dev);
 611
 612         ag71xx_hw_stop(ag);
 613
 614         napi_disable(&ag->napi);
 615         del_timer_sync(&ag->oom_timer);
 616
 617         spin_unlock_irqrestore(&ag->lock, flags);
 618
 619         ag71xx_rings_cleanup(ag);
 620
 621         return 0;
 622 }
 623
 624 static netdev_tx_t ag71xx_hard_start_xmit(struct sk_buff *skb,
 625                                           struct net_device *dev)
 626 {
 627         struct ag71xx *ag = netdev_priv(dev);
 628         struct ag71xx_ring *ring = &ag->tx_ring;
 629         struct ag71xx_desc *desc;
 630         dma_addr_t dma_addr;
 631         int i;
 632
 633         i = ring->curr % ring->size;
 634         desc = ring->buf[i].desc;
 635
 636         if (!ag71xx_desc_empty(desc))
 637                 goto err_drop;
 638
 639         if (ag71xx_has_ar8216(ag))
 640                 ag71xx_add_ar8216_header(ag, skb);
 641
 642         if (skb->len <= 0) {
 643                 DBG("%s: packet len is too small\n", ag->dev->name);
 644                 goto err_drop;
 645         }
 646
 647         dma_addr = dma_map_single(&dev->dev, skb->data, skb->len,
 648                                   DMA_TO_DEVICE);
 649
 650         ring->buf[i].skb = skb;
 651         ring->buf[i].timestamp = jiffies;
 652
 653         /* setup descriptor fields */
 654         desc->data = (u32) dma_addr;
 655         desc->ctrl = (skb->len & DESC_PKTLEN_M);
 656
 657         /* flush descriptor */
 658         wmb();
 659
 660         ring->curr++;
 661         if (ring->curr == (ring->dirty + ring->size)) {
 662                 DBG("%s: tx queue full\n", ag->dev->name);
 663                 netif_stop_queue(dev);
 664         }
 665
 666         DBG("%s: packet injected into TX queue\n", ag->dev->name);
 667
 668         /* enable TX engine */
 669         ag71xx_wr(ag, AG71XX_REG_TX_CTRL, TX_CTRL_TXE);
 670
 671         return NETDEV_TX_OK;
 672
 673 err_drop:
 674         dev->stats.tx_dropped++;
 675
 676         dev_kfree_skb(skb);
 677         return NETDEV_TX_OK;
 678 }
 679
 680 static int ag71xx_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 681 {
 682         struct ag71xx *ag = netdev_priv(dev);
 683         int ret;
 684
 685         switch (cmd) {
 686         case SIOCETHTOOL:
 687                 if (ag->phy_dev == NULL)
 688                         break;
 689
 690                 spin_lock_irq(&ag->lock);
 691                 ret = phy_ethtool_ioctl(ag->phy_dev, (void *) ifr->ifr_data);
 692                 spin_unlock_irq(&ag->lock);
 693                 return ret;
 694
 695         case SIOCSIFHWADDR:
 696                 if (copy_from_user
 697                         (dev->dev_addr, ifr->ifr_data, sizeof(dev->dev_addr)))
 698                         return -EFAULT;
 699                 return 0;
 700
 701         case SIOCGIFHWADDR:
 702                 if (copy_to_user
 703                         (ifr->ifr_data, dev->dev_addr, sizeof(dev->dev_addr)))
 704                         return -EFAULT;
 705                 return 0;
 706
 707         case SIOCGMIIPHY:
 708         case SIOCGMIIREG:
 709         case SIOCSMIIREG:
 710                 if (ag->phy_dev == NULL)
 711                         break;
 712
 713                 return phy_mii_ioctl(ag->phy_dev, ifr, cmd);
 714
 715         default:
 716                 break;
 717         }
 718
 719         return -EOPNOTSUPP;
 720 }
 721
 722 static void ag71xx_oom_timer_handler(unsigned long data)
 723 {
 724         struct net_device *dev = (struct net_device *) data;
 725         struct ag71xx *ag = netdev_priv(dev);
 726
 727         napi_schedule(&ag->napi);
 728 }
 729
 730 static void ag71xx_tx_timeout(struct net_device *dev)
 731 {
 732         struct ag71xx *ag = netdev_priv(dev);
 733
 734         if (netif_msg_tx_err(ag))
 735                 printk(KERN_DEBUG "%s: tx timeout\n", ag->dev->name);
 736
 737         schedule_work(&ag->restart_work);
 738 }
 739
 740 static void ag71xx_restart_work_func(struct work_struct *work)
 741 {
 742         struct ag71xx *ag = container_of(work, struct ag71xx, restart_work);
 743         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 744
 745         ag71xx_stop(ag->dev);
 746
 747         if (pdata->is_ar724x)
 748                 ag71xx_hw_init(ag);
 749
 750         ag71xx_open(ag->dev);
 751 }
 752
 753 static int ag71xx_tx_packets(struct ag71xx *ag)
 754 {
 755         struct ag71xx_ring *ring = &ag->tx_ring;
 756         int sent;
 757
 758         DBG("%s: processing TX ring\n", ag->dev->name);
 759
 760         sent = 0;
 761         while (ring->dirty != ring->curr) {
 762                 unsigned int i = ring->dirty % ring->size;
 763                 struct ag71xx_desc *desc = ring->buf[i].desc;
 764                 struct sk_buff *skb = ring->buf[i].skb;
 765
 766                 if (!ag71xx_desc_empty(desc))
 767                         break;
 768
 769                 ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
 770
 771                 ag->dev->stats.tx_bytes += skb->len;
 772                 ag->dev->stats.tx_packets++;
 773
 774                 dev_kfree_skb_any(skb);
 775                 ring->buf[i].skb = NULL;
 776
 777                 ring->dirty++;
 778                 sent++;
 779         }
 780
 781         DBG("%s: %d packets sent out\n", ag->dev->name, sent);
 782
 783         if ((ring->curr - ring->dirty) < (ring->size * 3) / 4)
 784                 netif_wake_queue(ag->dev);
 785
 786         return sent;
 787 }
 788
 789 static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 790 {
 791         struct net_device *dev = ag->dev;
 792         struct ag71xx_ring *ring = &ag->rx_ring;
 793         int done = 0;
 794
 795         DBG("%s: rx packets, limit=%d, curr=%u, dirty=%u\n",
 796                         dev->name, limit, ring->curr, ring->dirty);
 797
 798         while (done < limit) {
 799                 unsigned int i = ring->curr % ring->size;
 800                 struct ag71xx_desc *desc = ring->buf[i].desc;
 801                 struct sk_buff *skb;
 802                 int pktlen;
 803                 int err = 0;
 804
 805                 if (ag71xx_desc_empty(desc))
 806                         break;
 807
 808                 if ((ring->dirty + ring->size) == ring->curr) {
 809                         ag71xx_assert(0);
 810                         break;
 811                 }
 812
 813                 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
 814
 815                 skb = ring->buf[i].skb;
 816                 pktlen = ag71xx_desc_pktlen(desc);
 817                 pktlen -= ETH_FCS_LEN;
 818
 819                 dma_unmap_single(&dev->dev, ring->buf[i].dma_addr,
 820                                  AG71XX_RX_PKT_SIZE, DMA_FROM_DEVICE);
 821
 822                 dev->last_rx = jiffies;
 823                 dev->stats.rx_packets++;
 824                 dev->stats.rx_bytes += pktlen;
 825
 826                 skb_put(skb, pktlen);
 827                 if (ag71xx_has_ar8216(ag))
 828                         err = ag71xx_remove_ar8216_header(ag, skb, pktlen);
 829
 830                 if (err) {
 831                         dev->stats.rx_dropped++;
 832                         kfree_skb(skb);
 833                 } else {
 834                         skb->dev = dev;
 835                         skb->ip_summed = CHECKSUM_NONE;
 836                         if (ag->phy_dev) {
 837                                 ag->phy_dev->netif_receive_skb(skb);
 838                         } else {
 839                                 skb->protocol = eth_type_trans(skb, dev);
 840                                 netif_receive_skb(skb);
 841                         }
 842                 }
 843
 844                 ring->buf[i].skb = NULL;
 845                 done++;
 846
 847                 ring->curr++;
 848         }
 849
 850         ag71xx_ring_rx_refill(ag);
 851
 852         DBG("%s: rx finish, curr=%u, dirty=%u, done=%d\n",
 853                 dev->name, ring->curr, ring->dirty, done);
 854
 855         return done;
 856 }
 857
 858 static int ag71xx_poll(struct napi_struct *napi, int limit)
 859 {
 860         struct ag71xx *ag = container_of(napi, struct ag71xx, napi);
 861         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 862         struct net_device *dev = ag->dev;
 863         struct ag71xx_ring *rx_ring;
 864         unsigned long flags;
 865         u32 status;
 866         int tx_done;
 867         int rx_done;
 868
 869         pdata->ddr_flush();
 870         tx_done = ag71xx_tx_packets(ag);
 871
 872         DBG("%s: processing RX ring\n", dev->name);
 873         rx_done = ag71xx_rx_packets(ag, limit);
 874
 875         ag71xx_debugfs_update_napi_stats(ag, rx_done, tx_done);
 876
 877         rx_ring = &ag->rx_ring;
 878         if (rx_ring->buf[rx_ring->dirty % rx_ring->size].skb == NULL)
 879                 goto oom;
 880
 881         status = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
 882         if (unlikely(status & RX_STATUS_OF)) {
 883                 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_OF);
 884                 dev->stats.rx_fifo_errors++;
 885
 886                 /* restart RX */
 887                 ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
 888         }
 889
 890         if (rx_done < limit) {
 891                 if (status & RX_STATUS_PR)
 892                         goto more;
 893
 894                 status = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
 895                 if (status & TX_STATUS_PS)
 896                         goto more;
 897
 898                 DBG("%s: disable polling mode, rx=%d, tx=%d,limit=%d\n",
 899                         dev->name, rx_done, tx_done, limit);
 900
 901                 napi_complete(napi);
 902
 903                 /* enable interrupts */
 904                 spin_lock_irqsave(&ag->lock, flags);
 905                 ag71xx_int_enable(ag, AG71XX_INT_POLL);
 906                 spin_unlock_irqrestore(&ag->lock, flags);
 907                 return rx_done;
 908         }
 909
 910 more:
 911         DBG("%s: stay in polling mode, rx=%d, tx=%d, limit=%d\n",
 912                         dev->name, rx_done, tx_done, limit);
 913         return rx_done;
 914
 915 oom:
 916         if (netif_msg_rx_err(ag))
 917                 printk(KERN_DEBUG "%s: out of memory\n", dev->name);
 918
 919         mod_timer(&ag->oom_timer, jiffies + AG71XX_OOM_REFILL);
 920         napi_complete(napi);
 921         return 0;
 922 }
 923
 924 static irqreturn_t ag71xx_interrupt(int irq, void *dev_id)
 925 {
 926         struct net_device *dev = dev_id;
 927         struct ag71xx *ag = netdev_priv(dev);
 928         u32 status;
 929
 930         status = ag71xx_rr(ag, AG71XX_REG_INT_STATUS);
 931         ag71xx_dump_intr(ag, "raw", status);
 932
 933         if (unlikely(!status))
 934                 return IRQ_NONE;
 935
 936         if (unlikely(status & AG71XX_INT_ERR)) {
 937                 if (status & AG71XX_INT_TX_BE) {
 938                         ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE);
 939                         dev_err(&dev->dev, "TX BUS error\n");
 940                 }
 941                 if (status & AG71XX_INT_RX_BE) {
 942                         ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE);
 943                         dev_err(&dev->dev, "RX BUS error\n");
 944                 }
 945         }
 946
 947         if (likely(status & AG71XX_INT_POLL)) {
 948                 ag71xx_int_disable(ag, AG71XX_INT_POLL);
 949                 DBG("%s: enable polling mode\n", dev->name);
 950                 napi_schedule(&ag->napi);
 951         }
 952
 953         ag71xx_debugfs_update_int_stats(ag, status);
 954
 955         return IRQ_HANDLED;
 956 }
 957
 958 static void ag71xx_set_multicast_list(struct net_device *dev)
 959 {
 960         /* TODO */
 961 }
 962
 963 #ifdef CONFIG_NET_POLL_CONTROLLER
 964 /*
 965  * Polling 'interrupt' - used by things like netconsole to send skbs
 966  * without having to re-enable interrupts. It's not called while
 967  * the interrupt routine is executing.
 968  */
 969 static void ag71xx_netpoll(struct net_device *dev)
 970 {
 971         disable_irq(dev->irq);
 972         ag71xx_interrupt(dev->irq, dev);
 973         enable_irq(dev->irq);
 974 }
 975 #endif
 976
 977 static const struct net_device_ops ag71xx_netdev_ops = {
 978         .ndo_open               = ag71xx_open,
 979         .ndo_stop               = ag71xx_stop,
 980         .ndo_start_xmit         = ag71xx_hard_start_xmit,
 981         .ndo_set_multicast_list = ag71xx_set_multicast_list,
 982         .ndo_do_ioctl           = ag71xx_do_ioctl,
 983         .ndo_tx_timeout         = ag71xx_tx_timeout,
 984         .ndo_change_mtu         = eth_change_mtu,
 985         .ndo_set_mac_address    = eth_mac_addr,
 986         .ndo_validate_addr      = eth_validate_addr,
 987 #ifdef CONFIG_NET_POLL_CONTROLLER
 988         .ndo_poll_controller    = ag71xx_netpoll,
 989 #endif
 990 };
 991
 992 static int __devinit ag71xx_probe(struct platform_device *pdev)
 993 {
 994         struct net_device *dev;
 995         struct resource *res;
 996         struct ag71xx *ag;
 997         struct ag71xx_platform_data *pdata;
 998         int err;
 999
1000         pdata = pdev->dev.platform_data;
1001         if (!pdata) {
1002                 dev_err(&pdev->dev, "no platform data specified\n");
1003                 err = -ENXIO;
1004                 goto err_out;
1005         }
1006
1007         if (pdata->mii_bus_dev == NULL) {
1008                 dev_err(&pdev->dev, "no MII bus device specified\n");
1009                 err = -EINVAL;
1010                 goto err_out;
1011         }
1012
1013         dev = alloc_etherdev(sizeof(*ag));
1014         if (!dev) {
1015                 dev_err(&pdev->dev, "alloc_etherdev failed\n");
1016                 err = -ENOMEM;
1017                 goto err_out;
1018         }
1019
1020         SET_NETDEV_DEV(dev, &pdev->dev);
1021
1022         ag = netdev_priv(dev);
1023         ag->pdev = pdev;
1024         ag->dev = dev;
1025         ag->msg_enable = netif_msg_init(ag71xx_msg_level,
1026                                         AG71XX_DEFAULT_MSG_ENABLE);
1027         spin_lock_init(&ag->lock);
1028
1029         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mac_base");
1030         if (!res) {
1031                 dev_err(&pdev->dev, "no mac_base resource found\n");
1032                 err = -ENXIO;
1033                 goto err_out;
1034         }
1035
1036         ag->mac_base = ioremap_nocache(res->start, res->end - res->start + 1);
1037         if (!ag->mac_base) {
1038                 dev_err(&pdev->dev, "unable to ioremap mac_base\n");
1039                 err = -ENOMEM;
1040                 goto err_free_dev;
1041         }
1042
1043         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mii_ctrl");
1044         if (!res) {
1045                 dev_err(&pdev->dev, "no mii_ctrl resource found\n");
1046                 err = -ENXIO;
1047                 goto err_unmap_base;
1048         }
1049
1050         ag->mii_ctrl = ioremap_nocache(res->start, res->end - res->start + 1);
1051         if (!ag->mii_ctrl) {
1052                 dev_err(&pdev->dev, "unable to ioremap mii_ctrl\n");
1053                 err = -ENOMEM;
1054                 goto err_unmap_base;
1055         }
1056
1057         dev->irq = platform_get_irq(pdev, 0);
1058         err = request_irq(dev->irq, ag71xx_interrupt,
1059                           IRQF_DISABLED,
1060                           dev->name, dev);
1061         if (err) {
1062                 dev_err(&pdev->dev, "unable to request IRQ %d\n", dev->irq);
1063                 goto err_unmap_mii_ctrl;
1064         }
1065
1066         dev->base_addr = (unsigned long)ag->mac_base;
1067         dev->netdev_ops = &ag71xx_netdev_ops;
1068         dev->ethtool_ops = &ag71xx_ethtool_ops;
1069
1070         INIT_WORK(&ag->restart_work, ag71xx_restart_work_func);
1071
1072         init_timer(&ag->oom_timer);
1073         ag->oom_timer.data = (unsigned long) dev;
1074         ag->oom_timer.function = ag71xx_oom_timer_handler;
1075
1076         ag->tx_ring.size = AG71XX_TX_RING_SIZE_DEFAULT;
1077         ag->rx_ring.size = AG71XX_RX_RING_SIZE_DEFAULT;
1078
1079         memcpy(dev->dev_addr, pdata->mac_addr, ETH_ALEN);
1080
1081         netif_napi_add(dev, &ag->napi, ag71xx_poll, AG71XX_NAPI_WEIGHT);
1082
1083         err = register_netdev(dev);
1084         if (err) {
1085                 dev_err(&pdev->dev, "unable to register net device\n");
1086                 goto err_free_irq;
1087         }
1088
1089         printk(KERN_INFO "%s: Atheros AG71xx at 0x%08lx, irq %d\n",
1090                dev->name, dev->base_addr, dev->irq);
1091
1092         ag71xx_dump_regs(ag);
1093
1094         ag71xx_hw_init(ag);
1095
1096         ag71xx_dump_regs(ag);
1097
1098         err = ag71xx_phy_connect(ag);
1099         if (err)
1100                 goto err_unregister_netdev;
1101
1102         err = ag71xx_debugfs_init(ag);
1103         if (err)
1104                 goto err_phy_disconnect;
1105
1106         platform_set_drvdata(pdev, dev);
1107
1108         return 0;
1109
1110 err_phy_disconnect:
1111         ag71xx_phy_disconnect(ag);
1112 err_unregister_netdev:
1113         unregister_netdev(dev);
1114 err_free_irq:
1115         free_irq(dev->irq, dev);
1116 err_unmap_mii_ctrl:
1117         iounmap(ag->mii_ctrl);
1118 err_unmap_base:
1119         iounmap(ag->mac_base);
1120 err_free_dev:
1121         kfree(dev);
1122 err_out:
1123         platform_set_drvdata(pdev, NULL);
1124         return err;
1125 }
1126
1127 static int __devexit ag71xx_remove(struct platform_device *pdev)
1128 {
1129         struct net_device *dev = platform_get_drvdata(pdev);
1130
1131         if (dev) {
1132                 struct ag71xx *ag = netdev_priv(dev);
1133
1134                 ag71xx_debugfs_exit(ag);
1135                 ag71xx_phy_disconnect(ag);
1136                 unregister_netdev(dev);
1137                 free_irq(dev->irq, dev);
1138                 iounmap(ag->mii_ctrl);
1139                 iounmap(ag->mac_base);
1140                 kfree(dev);
1141                 platform_set_drvdata(pdev, NULL);
1142         }
1143
1144         return 0;
1145 }
1146
1147 static struct platform_driver ag71xx_driver = {
1148         .probe          = ag71xx_probe,
1149         .remove         = __exit_p(ag71xx_remove),
1150         .driver = {
1151                 .name   = AG71XX_DRV_NAME,
1152         }
1153 };
1154
1155 static int __init ag71xx_module_init(void)
1156 {
1157         int ret;
1158
1159         ret = ag71xx_debugfs_root_init();
1160         if (ret)
1161                 goto err_out;
1162
1163         ret = ag71xx_mdio_driver_init();
1164         if (ret)
1165                 goto err_debugfs_exit;
1166
1167         ret = platform_driver_register(&ag71xx_driver);
1168         if (ret)
1169                 goto err_mdio_exit;
1170
1171         return 0;
1172
1173 err_mdio_exit:
1174         ag71xx_mdio_driver_exit();
1175 err_debugfs_exit:
1176         ag71xx_debugfs_root_exit();
1177 err_out:
1178         return ret;
1179 }
1180
1181 static void __exit ag71xx_module_exit(void)
1182 {
1183         platform_driver_unregister(&ag71xx_driver);
1184         ag71xx_mdio_driver_exit();
1185         ag71xx_debugfs_root_exit();
1186 }
1187
1188 module_init(ag71xx_module_init);
1189 module_exit(ag71xx_module_exit);
1190
1191 MODULE_VERSION(AG71XX_DRV_VERSION);
1192 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
1193 MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org>");
1194 MODULE_LICENSE("GPL v2");
1195 MODULE_ALIAS("platform:" AG71XX_DRV_NAME);