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, unsigned int size)
  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, size * ring->desc_size,
 107                                              &ring->descs_dma, GFP_ATOMIC);
 108         if (!ring->descs_cpu) {
 109                 err = -ENOMEM;
 110                 goto err;
 111         }
 112
 113         ring->size = size;
 114
 115         ring->buf = kzalloc(size * sizeof(*ring->buf), GFP_KERNEL);
 116         if (!ring->buf) {
 117                 err = -ENOMEM;
 118                 goto err;
 119         }
 120
 121         for (i = 0; i < size; i++) {
 122                 int idx = i * ring->desc_size;
 123                 ring->buf[i].desc = (struct ag71xx_desc *)&ring->descs_cpu[idx];
 124                 DBG("ag71xx: ring %p, desc %d at %p\n",
 125                         ring, i, ring->buf[i].desc);
 126         }
 127
 128         return 0;
 129
 130 err:
 131         return err;
 132 }
 133
 134 static void ag71xx_ring_tx_clean(struct ag71xx *ag)
 135 {
 136         struct ag71xx_ring *ring = &ag->tx_ring;
 137         struct net_device *dev = ag->dev;
 138
 139         while (ring->curr != ring->dirty) {
 140                 u32 i = ring->dirty % AG71XX_TX_RING_SIZE;
 141
 142                 if (!ag71xx_desc_empty(ring->buf[i].desc)) {
 143                         ring->buf[i].desc->ctrl = 0;
 144                         dev->stats.tx_errors++;
 145                 }
 146
 147                 if (ring->buf[i].skb)
 148                         dev_kfree_skb_any(ring->buf[i].skb);
 149
 150                 ring->buf[i].skb = NULL;
 151
 152                 ring->dirty++;
 153         }
 154
 155         /* flush descriptors */
 156         wmb();
 157
 158 }
 159
 160 static void ag71xx_ring_tx_init(struct ag71xx *ag)
 161 {
 162         struct ag71xx_ring *ring = &ag->tx_ring;
 163         int i;
 164
 165         for (i = 0; i < AG71XX_TX_RING_SIZE; i++) {
 166                 ring->buf[i].desc->next = (u32) (ring->descs_dma +
 167                         ring->desc_size * ((i + 1) % AG71XX_TX_RING_SIZE));
 168
 169                 ring->buf[i].desc->ctrl = DESC_EMPTY;
 170                 ring->buf[i].skb = NULL;
 171         }
 172
 173         /* flush descriptors */
 174         wmb();
 175
 176         ring->curr = 0;
 177         ring->dirty = 0;
 178 }
 179
 180 static void ag71xx_ring_rx_clean(struct ag71xx *ag)
 181 {
 182         struct ag71xx_ring *ring = &ag->rx_ring;
 183         int i;
 184
 185         if (!ring->buf)
 186                 return;
 187
 188         for (i = 0; i < AG71XX_RX_RING_SIZE; i++)
 189                 if (ring->buf[i].skb) {
 190                         dma_unmap_single(&ag->dev->dev, ring->buf[i].dma_addr,
 191                                          AG71XX_RX_PKT_SIZE, DMA_FROM_DEVICE);
 192                         kfree_skb(ring->buf[i].skb);
 193                 }
 194 }
 195
 196 static int ag71xx_rx_reserve(struct ag71xx *ag)
 197 {
 198         int reserve = 0;
 199
 200         if (ag71xx_get_pdata(ag)->is_ar724x) {
 201                 if (!ag71xx_has_ar8216(ag))
 202                         reserve = 2;
 203
 204                 if (ag->phy_dev)
 205                         reserve += 4 - (ag->phy_dev->pkt_align % 4);
 206
 207                 reserve %= 4;
 208         }
 209
 210         return reserve + AG71XX_RX_PKT_RESERVE;
 211 }
 212
 213
 214 static int ag71xx_ring_rx_init(struct ag71xx *ag)
 215 {
 216         struct ag71xx_ring *ring = &ag->rx_ring;
 217         unsigned int reserve = ag71xx_rx_reserve(ag);
 218         unsigned int i;
 219         int ret;
 220
 221         ret = 0;
 222         for (i = 0; i < AG71XX_RX_RING_SIZE; i++) {
 223                 ring->buf[i].desc->next = (u32) (ring->descs_dma +
 224                         ring->desc_size * ((i + 1) % AG71XX_RX_RING_SIZE));
 225
 226                 DBG("ag71xx: RX desc at %p, next is %08x\n",
 227                         ring->buf[i].desc,
 228                         ring->buf[i].desc->next);
 229         }
 230
 231         for (i = 0; i < AG71XX_RX_RING_SIZE; i++) {
 232                 struct sk_buff *skb;
 233                 dma_addr_t dma_addr;
 234
 235                 skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE + reserve);
 236                 if (!skb) {
 237                         ret = -ENOMEM;
 238                         break;
 239                 }
 240
 241                 skb->dev = ag->dev;
 242                 skb_reserve(skb, reserve);
 243
 244                 dma_addr = dma_map_single(&ag->dev->dev, skb->data,
 245                                           AG71XX_RX_PKT_SIZE,
 246                                           DMA_FROM_DEVICE);
 247                 ring->buf[i].skb = skb;
 248                 ring->buf[i].dma_addr = dma_addr;
 249                 ring->buf[i].desc->data = (u32) dma_addr;
 250                 ring->buf[i].desc->ctrl = DESC_EMPTY;
 251         }
 252
 253         /* flush descriptors */
 254         wmb();
 255
 256         ring->curr = 0;
 257         ring->dirty = 0;
 258
 259         return ret;
 260 }
 261
 262 static int ag71xx_ring_rx_refill(struct ag71xx *ag)
 263 {
 264         struct ag71xx_ring *ring = &ag->rx_ring;
 265         unsigned int reserve = ag71xx_rx_reserve(ag);
 266         unsigned int count;
 267
 268         count = 0;
 269         for (; ring->curr - ring->dirty > 0; ring->dirty++) {
 270                 unsigned int i;
 271
 272                 i = ring->dirty % AG71XX_RX_RING_SIZE;
 273
 274                 if (ring->buf[i].skb == NULL) {
 275                         dma_addr_t dma_addr;
 276                         struct sk_buff *skb;
 277
 278                         skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE + reserve);
 279                         if (skb == NULL)
 280                                 break;
 281
 282                         skb_reserve(skb, reserve);
 283                         skb->dev = ag->dev;
 284
 285                         dma_addr = dma_map_single(&ag->dev->dev, skb->data,
 286                                                   AG71XX_RX_PKT_SIZE,
 287                                                   DMA_FROM_DEVICE);
 288
 289                         ring->buf[i].skb = skb;
 290                         ring->buf[i].dma_addr = dma_addr;
 291                         ring->buf[i].desc->data = (u32) dma_addr;
 292                 }
 293
 294                 ring->buf[i].desc->ctrl = DESC_EMPTY;
 295                 count++;
 296         }
 297
 298         /* flush descriptors */
 299         wmb();
 300
 301         DBG("%s: %u rx descriptors refilled\n", ag->dev->name, count);
 302
 303         return count;
 304 }
 305
 306 static int ag71xx_rings_init(struct ag71xx *ag)
 307 {
 308         int ret;
 309
 310         ret = ag71xx_ring_alloc(&ag->tx_ring, AG71XX_TX_RING_SIZE);
 311         if (ret)
 312                 return ret;
 313
 314         ag71xx_ring_tx_init(ag);
 315
 316         ret = ag71xx_ring_alloc(&ag->rx_ring, AG71XX_RX_RING_SIZE);
 317         if (ret)
 318                 return ret;
 319
 320         ret = ag71xx_ring_rx_init(ag);
 321         return ret;
 322 }
 323
 324 static void ag71xx_rings_cleanup(struct ag71xx *ag)
 325 {
 326         ag71xx_ring_rx_clean(ag);
 327         ag71xx_ring_free(&ag->rx_ring);
 328
 329         ag71xx_ring_tx_clean(ag);
 330         ag71xx_ring_free(&ag->tx_ring);
 331 }
 332
 333 static unsigned char *ag71xx_speed_str(struct ag71xx *ag)
 334 {
 335         switch (ag->speed) {
 336         case SPEED_1000:
 337                 return "1000";
 338         case SPEED_100:
 339                 return "100";
 340         case SPEED_10:
 341                 return "10";
 342         }
 343
 344         return "?";
 345 }
 346
 347 void ag71xx_link_adjust(struct ag71xx *ag)
 348 {
 349         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 350         u32 cfg2;
 351         u32 ifctl;
 352         u32 fifo5;
 353         u32 mii_speed;
 354
 355         if (!ag->link) {
 356                 netif_carrier_off(ag->dev);
 357                 if (netif_msg_link(ag))
 358                         printk(KERN_INFO "%s: link down\n", ag->dev->name);
 359                 return;
 360         }
 361
 362         cfg2 = ag71xx_rr(ag, AG71XX_REG_MAC_CFG2);
 363         cfg2 &= ~(MAC_CFG2_IF_1000 | MAC_CFG2_IF_10_100 | MAC_CFG2_FDX);
 364         cfg2 |= (ag->duplex) ? MAC_CFG2_FDX : 0;
 365
 366         ifctl = ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL);
 367         ifctl &= ~(MAC_IFCTL_SPEED);
 368
 369         fifo5 = ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5);
 370         fifo5 &= ~FIFO_CFG5_BM;
 371
 372         switch (ag->speed) {
 373         case SPEED_1000:
 374                 mii_speed =  MII_CTRL_SPEED_1000;
 375                 cfg2 |= MAC_CFG2_IF_1000;
 376                 fifo5 |= FIFO_CFG5_BM;
 377                 break;
 378         case SPEED_100:
 379                 mii_speed = MII_CTRL_SPEED_100;
 380                 cfg2 |= MAC_CFG2_IF_10_100;
 381                 ifctl |= MAC_IFCTL_SPEED;
 382                 break;
 383         case SPEED_10:
 384                 mii_speed = MII_CTRL_SPEED_10;
 385                 cfg2 |= MAC_CFG2_IF_10_100;
 386                 break;
 387         default:
 388                 BUG();
 389                 return;
 390         }
 391
 392         if (pdata->is_ar91xx)
 393                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, 0x00780fff);
 394         else if (pdata->is_ar724x)
 395                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, pdata->fifo_cfg3);
 396         else
 397                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, 0x008001ff);
 398
 399         if (pdata->set_pll)
 400                 pdata->set_pll(ag->speed);
 401
 402         ag71xx_mii_ctrl_set_speed(ag, mii_speed);
 403
 404         ag71xx_wr(ag, AG71XX_REG_MAC_CFG2, cfg2);
 405         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5);
 406         ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl);
 407
 408         netif_carrier_on(ag->dev);
 409         if (netif_msg_link(ag))
 410                 printk(KERN_INFO "%s: link up (%sMbps/%s duplex)\n",
 411                         ag->dev->name,
 412                         ag71xx_speed_str(ag),
 413                         (DUPLEX_FULL == ag->duplex) ? "Full" : "Half");
 414
 415         DBG("%s: fifo_cfg0=%#x, fifo_cfg1=%#x, fifo_cfg2=%#x\n",
 416                 ag->dev->name,
 417                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG0),
 418                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG1),
 419                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG2));
 420
 421         DBG("%s: fifo_cfg3=%#x, fifo_cfg4=%#x, fifo_cfg5=%#x\n",
 422                 ag->dev->name,
 423                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG3),
 424                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG4),
 425                 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5));
 426
 427         DBG("%s: mac_cfg2=%#x, mac_ifctl=%#x, mii_ctrl=%#x\n",
 428                 ag->dev->name,
 429                 ag71xx_rr(ag, AG71XX_REG_MAC_CFG2),
 430                 ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL),
 431                 ag71xx_mii_ctrl_rr(ag));
 432 }
 433
 434 static void ag71xx_hw_set_macaddr(struct ag71xx *ag, unsigned char *mac)
 435 {
 436         u32 t;
 437
 438         t = (((u32) mac[5]) << 24) | (((u32) mac[4]) << 16)
 439           | (((u32) mac[3]) << 8) | ((u32) mac[2]);
 440
 441         ag71xx_wr(ag, AG71XX_REG_MAC_ADDR1, t);
 442
 443         t = (((u32) mac[1]) << 24) | (((u32) mac[0]) << 16);
 444         ag71xx_wr(ag, AG71XX_REG_MAC_ADDR2, t);
 445 }
 446
 447 static void ag71xx_dma_reset(struct ag71xx *ag)
 448 {
 449         u32 val;
 450         int i;
 451
 452         ag71xx_dump_dma_regs(ag);
 453
 454         /* stop RX and TX */
 455         ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
 456         ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
 457
 458         /*
 459          * give the hardware some time to really stop all rx/tx activity
 460          * clearing the descriptors too early causes random memory corruption
 461          */
 462         mdelay(1);
 463
 464         /* clear descriptor addresses */
 465         ag71xx_wr(ag, AG71XX_REG_TX_DESC, 0);
 466         ag71xx_wr(ag, AG71XX_REG_RX_DESC, 0);
 467
 468         /* clear pending RX/TX interrupts */
 469         for (i = 0; i < 256; i++) {
 470                 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
 471                 ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
 472         }
 473
 474         /* clear pending errors */
 475         ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE | RX_STATUS_OF);
 476         ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE | TX_STATUS_UR);
 477
 478         val = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
 479         if (val)
 480                 printk(KERN_ALERT "%s: unable to clear DMA Rx status: %08x\n",
 481                         ag->dev->name, val);
 482
 483         val = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
 484
 485         /* mask out reserved bits */
 486         val &= ~0xff000000;
 487
 488         if (val)
 489                 printk(KERN_ALERT "%s: unable to clear DMA Tx status: %08x\n",
 490                         ag->dev->name, val);
 491
 492         ag71xx_dump_dma_regs(ag);
 493 }
 494
 495 #define MAC_CFG1_INIT   (MAC_CFG1_RXE | MAC_CFG1_TXE | \
 496                          MAC_CFG1_SRX | MAC_CFG1_STX)
 497
 498 #define FIFO_CFG0_INIT  (FIFO_CFG0_ALL << FIFO_CFG0_ENABLE_SHIFT)
 499
 500 #define FIFO_CFG4_INIT  (FIFO_CFG4_DE | FIFO_CFG4_DV | FIFO_CFG4_FC | \
 501                          FIFO_CFG4_CE | FIFO_CFG4_CR | FIFO_CFG4_LM | \
 502                          FIFO_CFG4_LO | FIFO_CFG4_OK | FIFO_CFG4_MC | \
 503                          FIFO_CFG4_BC | FIFO_CFG4_DR | FIFO_CFG4_LE | \
 504                          FIFO_CFG4_CF | FIFO_CFG4_PF | FIFO_CFG4_UO | \
 505                          FIFO_CFG4_VT)
 506
 507 #define FIFO_CFG5_INIT  (FIFO_CFG5_DE | FIFO_CFG5_DV | FIFO_CFG5_FC | \
 508                          FIFO_CFG5_CE | FIFO_CFG5_LO | FIFO_CFG5_OK | \
 509                          FIFO_CFG5_MC | FIFO_CFG5_BC | FIFO_CFG5_DR | \
 510                          FIFO_CFG5_CF | FIFO_CFG5_PF | FIFO_CFG5_VT | \
 511                          FIFO_CFG5_LE | FIFO_CFG5_FT | FIFO_CFG5_16 | \
 512                          FIFO_CFG5_17 | FIFO_CFG5_SF)
 513
 514 static void ag71xx_hw_init(struct ag71xx *ag)
 515 {
 516         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 517
 518         ag71xx_sb(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_SR);
 519         udelay(20);
 520
 521         ar71xx_device_stop(pdata->reset_bit);
 522         mdelay(100);
 523         ar71xx_device_start(pdata->reset_bit);
 524         mdelay(100);
 525
 526         /* setup MAC configuration registers */
 527         if (pdata->is_ar724x)
 528                 ag71xx_wr(ag, AG71XX_REG_MAC_CFG1,
 529                           MAC_CFG1_INIT | MAC_CFG1_TFC | MAC_CFG1_RFC);
 530         else
 531                 ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_INIT);
 532
 533         ag71xx_sb(ag, AG71XX_REG_MAC_CFG2,
 534                   MAC_CFG2_PAD_CRC_EN | MAC_CFG2_LEN_CHECK);
 535
 536         /* setup max frame length */
 537         ag71xx_wr(ag, AG71XX_REG_MAC_MFL, AG71XX_TX_MTU_LEN);
 538
 539         /* setup MII interface type */
 540         ag71xx_mii_ctrl_set_if(ag, pdata->mii_if);
 541
 542         /* setup FIFO configuration registers */
 543         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG0, FIFO_CFG0_INIT);
 544         if (pdata->is_ar724x) {
 545                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, pdata->fifo_cfg1);
 546                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, pdata->fifo_cfg2);
 547         } else {
 548                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, 0x0fff0000);
 549                 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, 0x00001fff);
 550         }
 551         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG4, FIFO_CFG4_INIT);
 552         ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, FIFO_CFG5_INIT);
 553
 554         ag71xx_dma_reset(ag);
 555 }
 556
 557 static void ag71xx_hw_start(struct ag71xx *ag)
 558 {
 559         /* start RX engine */
 560         ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
 561
 562         /* enable interrupts */
 563         ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, AG71XX_INT_INIT);
 564 }
 565
 566 static void ag71xx_hw_stop(struct ag71xx *ag)
 567 {
 568         /* disable all interrupts */
 569         ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, 0);
 570
 571         ag71xx_dma_reset(ag);
 572 }
 573
 574 static int ag71xx_open(struct net_device *dev)
 575 {
 576         struct ag71xx *ag = netdev_priv(dev);
 577         int ret;
 578
 579         ret = ag71xx_rings_init(ag);
 580         if (ret)
 581                 goto err;
 582
 583         napi_enable(&ag->napi);
 584
 585         netif_carrier_off(dev);
 586         ag71xx_phy_start(ag);
 587
 588         ag71xx_wr(ag, AG71XX_REG_TX_DESC, ag->tx_ring.descs_dma);
 589         ag71xx_wr(ag, AG71XX_REG_RX_DESC, ag->rx_ring.descs_dma);
 590
 591         ag71xx_hw_set_macaddr(ag, dev->dev_addr);
 592
 593         ag71xx_hw_start(ag);
 594
 595         netif_start_queue(dev);
 596
 597         return 0;
 598
 599 err:
 600         ag71xx_rings_cleanup(ag);
 601         return ret;
 602 }
 603
 604 static int ag71xx_stop(struct net_device *dev)
 605 {
 606         struct ag71xx *ag = netdev_priv(dev);
 607         unsigned long flags;
 608
 609         netif_carrier_off(dev);
 610         ag71xx_phy_stop(ag);
 611
 612         spin_lock_irqsave(&ag->lock, flags);
 613
 614         netif_stop_queue(dev);
 615
 616         ag71xx_hw_stop(ag);
 617
 618         napi_disable(&ag->napi);
 619         del_timer_sync(&ag->oom_timer);
 620
 621         spin_unlock_irqrestore(&ag->lock, flags);
 622
 623         ag71xx_rings_cleanup(ag);
 624
 625         return 0;
 626 }
 627
 628 static netdev_tx_t ag71xx_hard_start_xmit(struct sk_buff *skb,
 629                                           struct net_device *dev)
 630 {
 631         struct ag71xx *ag = netdev_priv(dev);
 632         struct ag71xx_ring *ring = &ag->tx_ring;
 633         struct ag71xx_desc *desc;
 634         dma_addr_t dma_addr;
 635         int i;
 636
 637         i = ring->curr % AG71XX_TX_RING_SIZE;
 638         desc = ring->buf[i].desc;
 639
 640         if (!ag71xx_desc_empty(desc))
 641                 goto err_drop;
 642
 643         if (ag71xx_has_ar8216(ag))
 644                 ag71xx_add_ar8216_header(ag, skb);
 645
 646         if (skb->len <= 0) {
 647                 DBG("%s: packet len is too small\n", ag->dev->name);
 648                 goto err_drop;
 649         }
 650
 651         dma_addr = dma_map_single(&dev->dev, skb->data, skb->len,
 652                                   DMA_TO_DEVICE);
 653
 654         ring->buf[i].skb = skb;
 655         ring->buf[i].timestamp = jiffies;
 656
 657         /* setup descriptor fields */
 658         desc->data = (u32) dma_addr;
 659         desc->ctrl = (skb->len & DESC_PKTLEN_M);
 660
 661         /* flush descriptor */
 662         wmb();
 663
 664         ring->curr++;
 665         if (ring->curr == (ring->dirty + AG71XX_TX_THRES_STOP)) {
 666                 DBG("%s: tx queue full\n", ag->dev->name);
 667                 netif_stop_queue(dev);
 668         }
 669
 670         DBG("%s: packet injected into TX queue\n", ag->dev->name);
 671
 672         /* enable TX engine */
 673         ag71xx_wr(ag, AG71XX_REG_TX_CTRL, TX_CTRL_TXE);
 674
 675         return NETDEV_TX_OK;
 676
 677 err_drop:
 678         dev->stats.tx_dropped++;
 679
 680         dev_kfree_skb(skb);
 681         return NETDEV_TX_OK;
 682 }
 683
 684 static int ag71xx_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 685 {
 686         struct ag71xx *ag = netdev_priv(dev);
 687         int ret;
 688
 689         switch (cmd) {
 690         case SIOCETHTOOL:
 691                 if (ag->phy_dev == NULL)
 692                         break;
 693
 694                 spin_lock_irq(&ag->lock);
 695                 ret = phy_ethtool_ioctl(ag->phy_dev, (void *) ifr->ifr_data);
 696                 spin_unlock_irq(&ag->lock);
 697                 return ret;
 698
 699         case SIOCSIFHWADDR:
 700                 if (copy_from_user
 701                         (dev->dev_addr, ifr->ifr_data, sizeof(dev->dev_addr)))
 702                         return -EFAULT;
 703                 return 0;
 704
 705         case SIOCGIFHWADDR:
 706                 if (copy_to_user
 707                         (ifr->ifr_data, dev->dev_addr, sizeof(dev->dev_addr)))
 708                         return -EFAULT;
 709                 return 0;
 710
 711         case SIOCGMIIPHY:
 712         case SIOCGMIIREG:
 713         case SIOCSMIIREG:
 714                 if (ag->phy_dev == NULL)
 715                         break;
 716
 717                 return phy_mii_ioctl(ag->phy_dev, ifr, cmd);
 718
 719         default:
 720                 break;
 721         }
 722
 723         return -EOPNOTSUPP;
 724 }
 725
 726 static void ag71xx_oom_timer_handler(unsigned long data)
 727 {
 728         struct net_device *dev = (struct net_device *) data;
 729         struct ag71xx *ag = netdev_priv(dev);
 730
 731         napi_schedule(&ag->napi);
 732 }
 733
 734 static void ag71xx_tx_timeout(struct net_device *dev)
 735 {
 736         struct ag71xx *ag = netdev_priv(dev);
 737
 738         if (netif_msg_tx_err(ag))
 739                 printk(KERN_DEBUG "%s: tx timeout\n", ag->dev->name);
 740
 741         schedule_work(&ag->restart_work);
 742 }
 743
 744 static void ag71xx_restart_work_func(struct work_struct *work)
 745 {
 746         struct ag71xx *ag = container_of(work, struct ag71xx, restart_work);
 747         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 748
 749         ag71xx_stop(ag->dev);
 750
 751         if (pdata->is_ar724x)
 752                 ag71xx_hw_init(ag);
 753
 754         ag71xx_open(ag->dev);
 755 }
 756
 757 static int ag71xx_tx_packets(struct ag71xx *ag)
 758 {
 759         struct ag71xx_ring *ring = &ag->tx_ring;
 760         int sent;
 761
 762         DBG("%s: processing TX ring\n", ag->dev->name);
 763
 764         sent = 0;
 765         while (ring->dirty != ring->curr) {
 766                 unsigned int i = ring->dirty % AG71XX_TX_RING_SIZE;
 767                 struct ag71xx_desc *desc = ring->buf[i].desc;
 768                 struct sk_buff *skb = ring->buf[i].skb;
 769
 770                 if (!ag71xx_desc_empty(desc))
 771                         break;
 772
 773                 ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
 774
 775                 ag->dev->stats.tx_bytes += skb->len;
 776                 ag->dev->stats.tx_packets++;
 777
 778                 dev_kfree_skb_any(skb);
 779                 ring->buf[i].skb = NULL;
 780
 781                 ring->dirty++;
 782                 sent++;
 783         }
 784
 785         DBG("%s: %d packets sent out\n", ag->dev->name, sent);
 786
 787         if ((ring->curr - ring->dirty) < AG71XX_TX_THRES_WAKEUP)
 788                 netif_wake_queue(ag->dev);
 789
 790         return sent;
 791 }
 792
 793 static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 794 {
 795         struct net_device *dev = ag->dev;
 796         struct ag71xx_ring *ring = &ag->rx_ring;
 797         int done = 0;
 798
 799         DBG("%s: rx packets, limit=%d, curr=%u, dirty=%u\n",
 800                         dev->name, limit, ring->curr, ring->dirty);
 801
 802         while (done < limit) {
 803                 unsigned int i = ring->curr % AG71XX_RX_RING_SIZE;
 804                 struct ag71xx_desc *desc = ring->buf[i].desc;
 805                 struct sk_buff *skb;
 806                 int pktlen;
 807                 int err = 0;
 808
 809                 if (ag71xx_desc_empty(desc))
 810                         break;
 811
 812                 if ((ring->dirty + AG71XX_RX_RING_SIZE) == ring->curr) {
 813                         ag71xx_assert(0);
 814                         break;
 815                 }
 816
 817                 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
 818
 819                 skb = ring->buf[i].skb;
 820                 pktlen = ag71xx_desc_pktlen(desc);
 821                 pktlen -= ETH_FCS_LEN;
 822
 823                 dma_unmap_single(&dev->dev, ring->buf[i].dma_addr,
 824                                  AG71XX_RX_PKT_SIZE, DMA_FROM_DEVICE);
 825
 826                 dev->last_rx = jiffies;
 827                 dev->stats.rx_packets++;
 828                 dev->stats.rx_bytes += pktlen;
 829
 830                 skb_put(skb, pktlen);
 831                 if (ag71xx_has_ar8216(ag))
 832                         err = ag71xx_remove_ar8216_header(ag, skb, pktlen);
 833
 834                 if (err) {
 835                         dev->stats.rx_dropped++;
 836                         kfree_skb(skb);
 837                 } else {
 838                         skb->dev = dev;
 839                         skb->ip_summed = CHECKSUM_NONE;
 840                         if (ag->phy_dev) {
 841                                 ag->phy_dev->netif_receive_skb(skb);
 842                         } else {
 843                                 skb->protocol = eth_type_trans(skb, dev);
 844                                 netif_receive_skb(skb);
 845                         }
 846                 }
 847
 848                 ring->buf[i].skb = NULL;
 849                 done++;
 850
 851                 ring->curr++;
 852         }
 853
 854         ag71xx_ring_rx_refill(ag);
 855
 856         DBG("%s: rx finish, curr=%u, dirty=%u, done=%d\n",
 857                 dev->name, ring->curr, ring->dirty, done);
 858
 859         return done;
 860 }
 861
 862 static int ag71xx_poll(struct napi_struct *napi, int limit)
 863 {
 864         struct ag71xx *ag = container_of(napi, struct ag71xx, napi);
 865         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 866         struct net_device *dev = ag->dev;
 867         struct ag71xx_ring *rx_ring;
 868         unsigned long flags;
 869         u32 status;
 870         int tx_done;
 871         int rx_done;
 872
 873         pdata->ddr_flush();
 874         tx_done = ag71xx_tx_packets(ag);
 875
 876         DBG("%s: processing RX ring\n", dev->name);
 877         rx_done = ag71xx_rx_packets(ag, limit);
 878
 879         ag71xx_debugfs_update_napi_stats(ag, rx_done, tx_done);
 880
 881         rx_ring = &ag->rx_ring;
 882         if (rx_ring->buf[rx_ring->dirty % AG71XX_RX_RING_SIZE].skb == NULL)
 883                 goto oom;
 884
 885         status = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
 886         if (unlikely(status & RX_STATUS_OF)) {
 887                 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_OF);
 888                 dev->stats.rx_fifo_errors++;
 889
 890                 /* restart RX */
 891                 ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
 892         }
 893
 894         if (rx_done < limit) {
 895                 if (status & RX_STATUS_PR)
 896                         goto more;
 897
 898                 status = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
 899                 if (status & TX_STATUS_PS)
 900                         goto more;
 901
 902                 DBG("%s: disable polling mode, rx=%d, tx=%d,limit=%d\n",
 903                         dev->name, rx_done, tx_done, limit);
 904
 905                 napi_complete(napi);
 906
 907                 /* enable interrupts */
 908                 spin_lock_irqsave(&ag->lock, flags);
 909                 ag71xx_int_enable(ag, AG71XX_INT_POLL);
 910                 spin_unlock_irqrestore(&ag->lock, flags);
 911                 return rx_done;
 912         }
 913
 914 more:
 915         DBG("%s: stay in polling mode, rx=%d, tx=%d, limit=%d\n",
 916                         dev->name, rx_done, tx_done, limit);
 917         return rx_done;
 918
 919 oom:
 920         if (netif_msg_rx_err(ag))
 921                 printk(KERN_DEBUG "%s: out of memory\n", dev->name);
 922
 923         mod_timer(&ag->oom_timer, jiffies + AG71XX_OOM_REFILL);
 924         napi_complete(napi);
 925         return 0;
 926 }
 927
 928 static irqreturn_t ag71xx_interrupt(int irq, void *dev_id)
 929 {
 930         struct net_device *dev = dev_id;
 931         struct ag71xx *ag = netdev_priv(dev);
 932         u32 status;
 933
 934         status = ag71xx_rr(ag, AG71XX_REG_INT_STATUS);
 935         ag71xx_dump_intr(ag, "raw", status);
 936
 937         if (unlikely(!status))
 938                 return IRQ_NONE;
 939
 940         if (unlikely(status & AG71XX_INT_ERR)) {
 941                 if (status & AG71XX_INT_TX_BE) {
 942                         ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE);
 943                         dev_err(&dev->dev, "TX BUS error\n");
 944                 }
 945                 if (status & AG71XX_INT_RX_BE) {
 946                         ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE);
 947                         dev_err(&dev->dev, "RX BUS error\n");
 948                 }
 949         }
 950
 951         if (likely(status & AG71XX_INT_POLL)) {
 952                 ag71xx_int_disable(ag, AG71XX_INT_POLL);
 953                 DBG("%s: enable polling mode\n", dev->name);
 954                 napi_schedule(&ag->napi);
 955         }
 956
 957         ag71xx_debugfs_update_int_stats(ag, status);
 958
 959         return IRQ_HANDLED;
 960 }
 961
 962 static void ag71xx_set_multicast_list(struct net_device *dev)
 963 {
 964         /* TODO */
 965 }
 966
 967 #ifdef CONFIG_NET_POLL_CONTROLLER
 968 /*
 969  * Polling 'interrupt' - used by things like netconsole to send skbs
 970  * without having to re-enable interrupts. It's not called while
 971  * the interrupt routine is executing.
 972  */
 973 static void ag71xx_netpoll(struct net_device *dev)
 974 {
 975         disable_irq(dev->irq);
 976         ag71xx_interrupt(dev->irq, dev);
 977         enable_irq(dev->irq);
 978 }
 979 #endif
 980
 981 static const struct net_device_ops ag71xx_netdev_ops = {
 982         .ndo_open               = ag71xx_open,
 983         .ndo_stop               = ag71xx_stop,
 984         .ndo_start_xmit         = ag71xx_hard_start_xmit,
 985         .ndo_set_multicast_list = ag71xx_set_multicast_list,
 986         .ndo_do_ioctl           = ag71xx_do_ioctl,
 987         .ndo_tx_timeout         = ag71xx_tx_timeout,
 988         .ndo_change_mtu         = eth_change_mtu,
 989         .ndo_set_mac_address    = eth_mac_addr,
 990         .ndo_validate_addr      = eth_validate_addr,
 991 #ifdef CONFIG_NET_POLL_CONTROLLER
 992         .ndo_poll_controller    = ag71xx_netpoll,
 993 #endif
 994 };
 995
 996 static int __devinit ag71xx_probe(struct platform_device *pdev)
 997 {
 998         struct net_device *dev;
 999         struct resource *res;
1000         struct ag71xx *ag;
1001         struct ag71xx_platform_data *pdata;
1002         int err;
1003
1004         pdata = pdev->dev.platform_data;
1005         if (!pdata) {
1006                 dev_err(&pdev->dev, "no platform data specified\n");
1007                 err = -ENXIO;
1008                 goto err_out;
1009         }
1010
1011         if (pdata->mii_bus_dev == NULL) {
1012                 dev_err(&pdev->dev, "no MII bus device specified\n");
1013                 err = -EINVAL;
1014                 goto err_out;
1015         }
1016
1017         dev = alloc_etherdev(sizeof(*ag));
1018         if (!dev) {
1019                 dev_err(&pdev->dev, "alloc_etherdev failed\n");
1020                 err = -ENOMEM;
1021                 goto err_out;
1022         }
1023
1024         SET_NETDEV_DEV(dev, &pdev->dev);
1025
1026         ag = netdev_priv(dev);
1027         ag->pdev = pdev;
1028         ag->dev = dev;
1029         ag->msg_enable = netif_msg_init(ag71xx_msg_level,
1030                                         AG71XX_DEFAULT_MSG_ENABLE);
1031         spin_lock_init(&ag->lock);
1032
1033         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mac_base");
1034         if (!res) {
1035                 dev_err(&pdev->dev, "no mac_base resource found\n");
1036                 err = -ENXIO;
1037                 goto err_out;
1038         }
1039
1040         ag->mac_base = ioremap_nocache(res->start, res->end - res->start + 1);
1041         if (!ag->mac_base) {
1042                 dev_err(&pdev->dev, "unable to ioremap mac_base\n");
1043                 err = -ENOMEM;
1044                 goto err_free_dev;
1045         }
1046
1047         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mii_ctrl");
1048         if (!res) {
1049                 dev_err(&pdev->dev, "no mii_ctrl resource found\n");
1050                 err = -ENXIO;
1051                 goto err_unmap_base;
1052         }
1053
1054         ag->mii_ctrl = ioremap_nocache(res->start, res->end - res->start + 1);
1055         if (!ag->mii_ctrl) {
1056                 dev_err(&pdev->dev, "unable to ioremap mii_ctrl\n");
1057                 err = -ENOMEM;
1058                 goto err_unmap_base;
1059         }
1060
1061         dev->irq = platform_get_irq(pdev, 0);
1062         err = request_irq(dev->irq, ag71xx_interrupt,
1063                           IRQF_DISABLED,
1064                           dev->name, dev);
1065         if (err) {
1066                 dev_err(&pdev->dev, "unable to request IRQ %d\n", dev->irq);
1067                 goto err_unmap_mii_ctrl;
1068         }
1069
1070         dev->base_addr = (unsigned long)ag->mac_base;
1071         dev->netdev_ops = &ag71xx_netdev_ops;
1072         dev->ethtool_ops = &ag71xx_ethtool_ops;
1073
1074         INIT_WORK(&ag->restart_work, ag71xx_restart_work_func);
1075
1076         init_timer(&ag->oom_timer);
1077         ag->oom_timer.data = (unsigned long) dev;
1078         ag->oom_timer.function = ag71xx_oom_timer_handler;
1079
1080         memcpy(dev->dev_addr, pdata->mac_addr, ETH_ALEN);
1081
1082         netif_napi_add(dev, &ag->napi, ag71xx_poll, AG71XX_NAPI_WEIGHT);
1083
1084         err = register_netdev(dev);
1085         if (err) {
1086                 dev_err(&pdev->dev, "unable to register net device\n");
1087                 goto err_free_irq;
1088         }
1089
1090         printk(KERN_INFO "%s: Atheros AG71xx at 0x%08lx, irq %d\n",
1091                dev->name, dev->base_addr, dev->irq);
1092
1093         ag71xx_dump_regs(ag);
1094
1095         ag71xx_hw_init(ag);
1096
1097         ag71xx_dump_regs(ag);
1098
1099         err = ag71xx_phy_connect(ag);
1100         if (err)
1101                 goto err_unregister_netdev;
1102
1103         err = ag71xx_debugfs_init(ag);
1104         if (err)
1105                 goto err_phy_disconnect;
1106
1107         platform_set_drvdata(pdev, dev);
1108
1109         return 0;
1110
1111 err_phy_disconnect:
1112         ag71xx_phy_disconnect(ag);
1113 err_unregister_netdev:
1114         unregister_netdev(dev);
1115 err_free_irq:
1116         free_irq(dev->irq, dev);
1117 err_unmap_mii_ctrl:
1118         iounmap(ag->mii_ctrl);
1119 err_unmap_base:
1120         iounmap(ag->mac_base);
1121 err_free_dev:
1122         kfree(dev);
1123 err_out:
1124         platform_set_drvdata(pdev, NULL);
1125         return err;
1126 }
1127
1128 static int __devexit ag71xx_remove(struct platform_device *pdev)
1129 {
1130         struct net_device *dev = platform_get_drvdata(pdev);
1131
1132         if (dev) {
1133                 struct ag71xx *ag = netdev_priv(dev);
1134
1135                 ag71xx_debugfs_exit(ag);
1136                 ag71xx_phy_disconnect(ag);
1137                 unregister_netdev(dev);
1138                 free_irq(dev->irq, dev);
1139                 iounmap(ag->mii_ctrl);
1140                 iounmap(ag->mac_base);
1141                 kfree(dev);
1142                 platform_set_drvdata(pdev, NULL);
1143         }
1144
1145         return 0;
1146 }
1147
1148 static struct platform_driver ag71xx_driver = {
1149         .probe          = ag71xx_probe,
1150         .remove         = __exit_p(ag71xx_remove),
1151         .driver = {
1152                 .name   = AG71XX_DRV_NAME,
1153         }
1154 };
1155
1156 static int __init ag71xx_module_init(void)
1157 {
1158         int ret;
1159
1160         ret = ag71xx_debugfs_root_init();
1161         if (ret)
1162                 goto err_out;
1163
1164         ret = ag71xx_mdio_driver_init();
1165         if (ret)
1166                 goto err_debugfs_exit;
1167
1168         ret = platform_driver_register(&ag71xx_driver);
1169         if (ret)
1170                 goto err_mdio_exit;
1171
1172         return 0;
1173
1174 err_mdio_exit:
1175         ag71xx_mdio_driver_exit();
1176 err_debugfs_exit:
1177         ag71xx_debugfs_root_exit();
1178 err_out:
1179         return ret;
1180 }
1181
1182 static void __exit ag71xx_module_exit(void)
1183 {
1184         platform_driver_unregister(&ag71xx_driver);
1185         ag71xx_mdio_driver_exit();
1186         ag71xx_debugfs_root_exit();
1187 }
1188
1189 module_init(ag71xx_module_init);
1190 module_exit(ag71xx_module_exit);
1191
1192 MODULE_VERSION(AG71XX_DRV_VERSION);
1193 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
1194 MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org>");
1195 MODULE_LICENSE("GPL v2");
1196 MODULE_ALIAS("platform:" AG71XX_DRV_NAME);