drivers/net/ethernet/ti/cpmac.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2006, 2007 Eugene Konev
   4  *
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/moduleparam.h>
  10
  11 #include <linux/sched.h>
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/errno.h>
  15 #include <linux/types.h>
  16 #include <linux/delay.h>
  17
  18 #include <linux/netdevice.h>
  19 #include <linux/if_vlan.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/ethtool.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/mii.h>
  24 #include <linux/phy.h>
  25 #include <linux/phy_fixed.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/clk.h>
  29 #include <linux/gpio.h>
  30 #include <linux/atomic.h>
  31
  32 #include <asm/mach-ar7/ar7.h>
  33
  34 MODULE_AUTHOR("Eugene Konev <ejka@imfi.kspu.ru>");
  35 MODULE_DESCRIPTION("TI AR7 ethernet driver (CPMAC)");
  36 MODULE_LICENSE("GPL");
  37 MODULE_ALIAS("platform:cpmac");
  38
  39 static int debug_level = 8;
  40 static int dumb_switch;
  41
  42 /* Next 2 are only used in cpmac_probe, so it's pointless to change them */
  43 module_param(debug_level, int, 0444);
  44 module_param(dumb_switch, int, 0444);
  45
  46 MODULE_PARM_DESC(debug_level, "Number of NETIF_MSG bits to enable");
  47 MODULE_PARM_DESC(dumb_switch, "Assume switch is not connected to MDIO bus");
  48
  49 #define CPMAC_VERSION "0.5.2"
  50 /* frame size + 802.1q tag + FCS size */
  51 #define CPMAC_SKB_SIZE          (ETH_FRAME_LEN + ETH_FCS_LEN + VLAN_HLEN)
  52 #define CPMAC_QUEUES    8
  53
  54 /* Ethernet registers */
  55 #define CPMAC_TX_CONTROL                0x0004
  56 #define CPMAC_TX_TEARDOWN               0x0008
  57 #define CPMAC_RX_CONTROL                0x0014
  58 #define CPMAC_RX_TEARDOWN               0x0018
  59 #define CPMAC_MBP                       0x0100
  60 #define MBP_RXPASSCRC                   0x40000000
  61 #define MBP_RXQOS                       0x20000000
  62 #define MBP_RXNOCHAIN                   0x10000000
  63 #define MBP_RXCMF                       0x01000000
  64 #define MBP_RXSHORT                     0x00800000
  65 #define MBP_RXCEF                       0x00400000
  66 #define MBP_RXPROMISC                   0x00200000
  67 #define MBP_PROMISCCHAN(channel)        (((channel) & 0x7) << 16)
  68 #define MBP_RXBCAST                     0x00002000
  69 #define MBP_BCASTCHAN(channel)          (((channel) & 0x7) << 8)
  70 #define MBP_RXMCAST                     0x00000020
  71 #define MBP_MCASTCHAN(channel)          ((channel) & 0x7)
  72 #define CPMAC_UNICAST_ENABLE            0x0104
  73 #define CPMAC_UNICAST_CLEAR             0x0108
  74 #define CPMAC_MAX_LENGTH                0x010c
  75 #define CPMAC_BUFFER_OFFSET             0x0110
  76 #define CPMAC_MAC_CONTROL               0x0160
  77 #define MAC_TXPTYPE                     0x00000200
  78 #define MAC_TXPACE                      0x00000040
  79 #define MAC_MII                         0x00000020
  80 #define MAC_TXFLOW                      0x00000010
  81 #define MAC_RXFLOW                      0x00000008
  82 #define MAC_MTEST                       0x00000004
  83 #define MAC_LOOPBACK                    0x00000002
  84 #define MAC_FDX                         0x00000001
  85 #define CPMAC_MAC_STATUS                0x0164
  86 #define MAC_STATUS_QOS                  0x00000004
  87 #define MAC_STATUS_RXFLOW               0x00000002
  88 #define MAC_STATUS_TXFLOW               0x00000001
  89 #define CPMAC_TX_INT_ENABLE             0x0178
  90 #define CPMAC_TX_INT_CLEAR              0x017c
  91 #define CPMAC_MAC_INT_VECTOR            0x0180
  92 #define MAC_INT_STATUS                  0x00080000
  93 #define MAC_INT_HOST                    0x00040000
  94 #define MAC_INT_RX                      0x00020000
  95 #define MAC_INT_TX                      0x00010000
  96 #define CPMAC_MAC_EOI_VECTOR            0x0184
  97 #define CPMAC_RX_INT_ENABLE             0x0198
  98 #define CPMAC_RX_INT_CLEAR              0x019c
  99 #define CPMAC_MAC_INT_ENABLE            0x01a8
 100 #define CPMAC_MAC_INT_CLEAR             0x01ac
 101 #define CPMAC_MAC_ADDR_LO(channel)      (0x01b0 + (channel) * 4)
 102 #define CPMAC_MAC_ADDR_MID              0x01d0
 103 #define CPMAC_MAC_ADDR_HI               0x01d4
 104 #define CPMAC_MAC_HASH_LO               0x01d8
 105 #define CPMAC_MAC_HASH_HI               0x01dc
 106 #define CPMAC_TX_PTR(channel)           (0x0600 + (channel) * 4)
 107 #define CPMAC_RX_PTR(channel)           (0x0620 + (channel) * 4)
 108 #define CPMAC_TX_ACK(channel)           (0x0640 + (channel) * 4)
 109 #define CPMAC_RX_ACK(channel)           (0x0660 + (channel) * 4)
 110 #define CPMAC_REG_END                   0x0680
 111
 112 /* Rx/Tx statistics
 113  * TODO: use some of them to fill stats in cpmac_stats()
 114  */
 115 #define CPMAC_STATS_RX_GOOD             0x0200
 116 #define CPMAC_STATS_RX_BCAST            0x0204
 117 #define CPMAC_STATS_RX_MCAST            0x0208
 118 #define CPMAC_STATS_RX_PAUSE            0x020c
 119 #define CPMAC_STATS_RX_CRC              0x0210
 120 #define CPMAC_STATS_RX_ALIGN            0x0214
 121 #define CPMAC_STATS_RX_OVER             0x0218
 122 #define CPMAC_STATS_RX_JABBER           0x021c
 123 #define CPMAC_STATS_RX_UNDER            0x0220
 124 #define CPMAC_STATS_RX_FRAG             0x0224
 125 #define CPMAC_STATS_RX_FILTER           0x0228
 126 #define CPMAC_STATS_RX_QOSFILTER        0x022c
 127 #define CPMAC_STATS_RX_OCTETS           0x0230
 128
 129 #define CPMAC_STATS_TX_GOOD             0x0234
 130 #define CPMAC_STATS_TX_BCAST            0x0238
 131 #define CPMAC_STATS_TX_MCAST            0x023c
 132 #define CPMAC_STATS_TX_PAUSE            0x0240
 133 #define CPMAC_STATS_TX_DEFER            0x0244
 134 #define CPMAC_STATS_TX_COLLISION        0x0248
 135 #define CPMAC_STATS_TX_SINGLECOLL       0x024c
 136 #define CPMAC_STATS_TX_MULTICOLL        0x0250
 137 #define CPMAC_STATS_TX_EXCESSCOLL       0x0254
 138 #define CPMAC_STATS_TX_LATECOLL         0x0258
 139 #define CPMAC_STATS_TX_UNDERRUN         0x025c
 140 #define CPMAC_STATS_TX_CARRIERSENSE     0x0260
 141 #define CPMAC_STATS_TX_OCTETS           0x0264
 142
 143 #define cpmac_read(base, reg)           (readl((void __iomem *)(base) + (reg)))
 144 #define cpmac_write(base, reg, val)     (writel(val, (void __iomem *)(base) + \
 145                                                 (reg)))
 146
 147 /* MDIO bus */
 148 #define CPMAC_MDIO_VERSION              0x0000
 149 #define CPMAC_MDIO_CONTROL              0x0004
 150 #define MDIOC_IDLE                      0x80000000
 151 #define MDIOC_ENABLE                    0x40000000
 152 #define MDIOC_PREAMBLE                  0x00100000
 153 #define MDIOC_FAULT                     0x00080000
 154 #define MDIOC_FAULTDETECT               0x00040000
 155 #define MDIOC_INTTEST                   0x00020000
 156 #define MDIOC_CLKDIV(div)               ((div) & 0xff)
 157 #define CPMAC_MDIO_ALIVE                0x0008
 158 #define CPMAC_MDIO_LINK                 0x000c
 159 #define CPMAC_MDIO_ACCESS(channel)      (0x0080 + (channel) * 8)
 160 #define MDIO_BUSY                       0x80000000
 161 #define MDIO_WRITE                      0x40000000
 162 #define MDIO_REG(reg)                   (((reg) & 0x1f) << 21)
 163 #define MDIO_PHY(phy)                   (((phy) & 0x1f) << 16)
 164 #define MDIO_DATA(data)                 ((data) & 0xffff)
 165 #define CPMAC_MDIO_PHYSEL(channel)      (0x0084 + (channel) * 8)
 166 #define PHYSEL_LINKSEL                  0x00000040
 167 #define PHYSEL_LINKINT                  0x00000020
 168
 169 struct cpmac_desc {
 170         u32 hw_next;
 171         u32 hw_data;
 172         u16 buflen;
 173         u16 bufflags;
 174         u16 datalen;
 175         u16 dataflags;
 176 #define CPMAC_SOP                       0x8000
 177 #define CPMAC_EOP                       0x4000
 178 #define CPMAC_OWN                       0x2000
 179 #define CPMAC_EOQ                       0x1000
 180         struct sk_buff *skb;
 181         struct cpmac_desc *next;
 182         struct cpmac_desc *prev;
 183         dma_addr_t mapping;
 184         dma_addr_t data_mapping;
 185 };
 186
 187 struct cpmac_priv {
 188         spinlock_t lock;
 189         spinlock_t rx_lock;
 190         struct cpmac_desc *rx_head;
 191         int ring_size;
 192         struct cpmac_desc *desc_ring;
 193         dma_addr_t dma_ring;
 194         void __iomem *regs;
 195         struct mii_bus *mii_bus;
 196         char phy_name[MII_BUS_ID_SIZE + 3];
 197         int oldlink, oldspeed, oldduplex;
 198         u32 msg_enable;
 199         struct net_device *dev;
 200         struct work_struct reset_work;
 201         struct platform_device *pdev;
 202         struct napi_struct napi;
 203         atomic_t reset_pending;
 204 };
 205
 206 static irqreturn_t cpmac_irq(int, void *);
 207 static void cpmac_hw_start(struct net_device *dev);
 208 static void cpmac_hw_stop(struct net_device *dev);
 209 static int cpmac_stop(struct net_device *dev);
 210 static int cpmac_open(struct net_device *dev);
 211
 212 static void cpmac_dump_regs(struct net_device *dev)
 213 {
 214         int i;
 215         struct cpmac_priv *priv = netdev_priv(dev);
 216
 217         for (i = 0; i < CPMAC_REG_END; i += 4) {
 218                 if (i % 16 == 0) {
 219                         if (i)
 220                                 printk("\n");
 221                         printk("%s: reg[%p]:", dev->name, priv->regs + i);
 222                 }
 223                 printk(" %08x", cpmac_read(priv->regs, i));
 224         }
 225         printk("\n");
 226 }
 227
 228 static void cpmac_dump_desc(struct net_device *dev, struct cpmac_desc *desc)
 229 {
 230         int i;
 231
 232         printk("%s: desc[%p]:", dev->name, desc);
 233         for (i = 0; i < sizeof(*desc) / 4; i++)
 234                 printk(" %08x", ((u32 *)desc)[i]);
 235         printk("\n");
 236 }
 237
 238 static void cpmac_dump_all_desc(struct net_device *dev)
 239 {
 240         struct cpmac_priv *priv = netdev_priv(dev);
 241         struct cpmac_desc *dump = priv->rx_head;
 242
 243         do {
 244                 cpmac_dump_desc(dev, dump);
 245                 dump = dump->next;
 246         } while (dump != priv->rx_head);
 247 }
 248
 249 static void cpmac_dump_skb(struct net_device *dev, struct sk_buff *skb)
 250 {
 251         int i;
 252
 253         printk("%s: skb 0x%p, len=%d\n", dev->name, skb, skb->len);
 254         for (i = 0; i < skb->len; i++) {
 255                 if (i % 16 == 0) {
 256                         if (i)
 257                                 printk("\n");
 258                         printk("%s: data[%p]:", dev->name, skb->data + i);
 259                 }
 260                 printk(" %02x", ((u8 *)skb->data)[i]);
 261         }
 262         printk("\n");
 263 }
 264
 265 static int cpmac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 266 {
 267         u32 val;
 268
 269         while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
 270                 cpu_relax();
 271         cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_REG(reg) |
 272                     MDIO_PHY(phy_id));
 273         while ((val = cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0))) & MDIO_BUSY)
 274                 cpu_relax();
 275
 276         return MDIO_DATA(val);
 277 }
 278
 279 static int cpmac_mdio_write(struct mii_bus *bus, int phy_id,
 280                             int reg, u16 val)
 281 {
 282         while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
 283                 cpu_relax();
 284         cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_WRITE |
 285                     MDIO_REG(reg) | MDIO_PHY(phy_id) | MDIO_DATA(val));
 286
 287         return 0;
 288 }
 289
 290 static int cpmac_mdio_reset(struct mii_bus *bus)
 291 {
 292         struct clk *cpmac_clk;
 293
 294         cpmac_clk = clk_get(&bus->dev, "cpmac");
 295         if (IS_ERR(cpmac_clk)) {
 296                 pr_err("unable to get cpmac clock\n");
 297                 return -1;
 298         }
 299         ar7_device_reset(AR7_RESET_BIT_MDIO);
 300         cpmac_write(bus->priv, CPMAC_MDIO_CONTROL, MDIOC_ENABLE |
 301                     MDIOC_CLKDIV(clk_get_rate(cpmac_clk) / 2200000 - 1));
 302
 303         return 0;
 304 }
 305
 306 static struct mii_bus *cpmac_mii;
 307
 308 static void cpmac_set_multicast_list(struct net_device *dev)
 309 {
 310         struct netdev_hw_addr *ha;
 311         u8 tmp;
 312         u32 mbp, bit, hash[2] = { 0, };
 313         struct cpmac_priv *priv = netdev_priv(dev);
 314
 315         mbp = cpmac_read(priv->regs, CPMAC_MBP);
 316         if (dev->flags & IFF_PROMISC) {
 317                 cpmac_write(priv->regs, CPMAC_MBP, (mbp & ~MBP_PROMISCCHAN(0)) |
 318                             MBP_RXPROMISC);
 319         } else {
 320                 cpmac_write(priv->regs, CPMAC_MBP, mbp & ~MBP_RXPROMISC);
 321                 if (dev->flags & IFF_ALLMULTI) {
 322                         /* enable all multicast mode */
 323                         cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, 0xffffffff);
 324                         cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, 0xffffffff);
 325                 } else {
 326                         /* cpmac uses some strange mac address hashing
 327                          * (not crc32)
 328                          */
 329                         netdev_for_each_mc_addr(ha, dev) {
 330                                 bit = 0;
 331                                 tmp = ha->addr[0];
 332                                 bit  ^= (tmp >> 2) ^ (tmp << 4);
 333                                 tmp = ha->addr[1];
 334                                 bit  ^= (tmp >> 4) ^ (tmp << 2);
 335                                 tmp = ha->addr[2];
 336                                 bit  ^= (tmp >> 6) ^ tmp;
 337                                 tmp = ha->addr[3];
 338                                 bit  ^= (tmp >> 2) ^ (tmp << 4);
 339                                 tmp = ha->addr[4];
 340                                 bit  ^= (tmp >> 4) ^ (tmp << 2);
 341                                 tmp = ha->addr[5];
 342                                 bit  ^= (tmp >> 6) ^ tmp;
 343                                 bit &= 0x3f;
 344                                 hash[bit / 32] |= 1 << (bit % 32);
 345                         }
 346
 347                         cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, hash[0]);
 348                         cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, hash[1]);
 349                 }
 350         }
 351 }
 352
 353 static struct sk_buff *cpmac_rx_one(struct cpmac_priv *priv,
 354                                     struct cpmac_desc *desc)
 355 {
 356         struct sk_buff *skb, *result = NULL;
 357
 358         if (unlikely(netif_msg_hw(priv)))
 359                 cpmac_dump_desc(priv->dev, desc);
 360         cpmac_write(priv->regs, CPMAC_RX_ACK(0), (u32)desc->mapping);
 361         if (unlikely(!desc->datalen)) {
 362                 if (netif_msg_rx_err(priv) && net_ratelimit())
 363                         netdev_warn(priv->dev, "rx: spurious interrupt\n");
 364
 365                 return NULL;
 366         }
 367
 368         skb = netdev_alloc_skb_ip_align(priv->dev, CPMAC_SKB_SIZE);
 369         if (likely(skb)) {
 370                 skb_put(desc->skb, desc->datalen);
 371                 desc->skb->protocol = eth_type_trans(desc->skb, priv->dev);
 372                 skb_checksum_none_assert(desc->skb);
 373                 priv->dev->stats.rx_packets++;
 374                 priv->dev->stats.rx_bytes += desc->datalen;
 375                 result = desc->skb;
 376                 dma_unmap_single(&priv->dev->dev, desc->data_mapping,
 377                                  CPMAC_SKB_SIZE, DMA_FROM_DEVICE);
 378                 desc->skb = skb;
 379                 desc->data_mapping = dma_map_single(&priv->dev->dev, skb->data,
 380                                                     CPMAC_SKB_SIZE,
 381                                                     DMA_FROM_DEVICE);
 382                 desc->hw_data = (u32)desc->data_mapping;
 383                 if (unlikely(netif_msg_pktdata(priv))) {
 384                         netdev_dbg(priv->dev, "received packet:\n");
 385                         cpmac_dump_skb(priv->dev, result);
 386                 }
 387         } else {
 388                 if (netif_msg_rx_err(priv) && net_ratelimit())
 389                         netdev_warn(priv->dev,
 390                                     "low on skbs, dropping packet\n");
 391
 392                 priv->dev->stats.rx_dropped++;
 393         }
 394
 395         desc->buflen = CPMAC_SKB_SIZE;
 396         desc->dataflags = CPMAC_OWN;
 397
 398         return result;
 399 }
 400
 401 static int cpmac_poll(struct napi_struct *napi, int budget)
 402 {
 403         struct sk_buff *skb;
 404         struct cpmac_desc *desc, *restart;
 405         struct cpmac_priv *priv = container_of(napi, struct cpmac_priv, napi);
 406         int received = 0, processed = 0;
 407
 408         spin_lock(&priv->rx_lock);
 409         if (unlikely(!priv->rx_head)) {
 410                 if (netif_msg_rx_err(priv) && net_ratelimit())
 411                         netdev_warn(priv->dev, "rx: polling, but no queue\n");
 412
 413                 spin_unlock(&priv->rx_lock);
 414                 napi_complete(napi);
 415                 return 0;
 416         }
 417
 418         desc = priv->rx_head;
 419         restart = NULL;
 420         while (((desc->dataflags & CPMAC_OWN) == 0) && (received < budget)) {
 421                 processed++;
 422
 423                 if ((desc->dataflags & CPMAC_EOQ) != 0) {
 424                         /* The last update to eoq->hw_next didn't happen
 425                          * soon enough, and the receiver stopped here.
 426                          * Remember this descriptor so we can restart
 427                          * the receiver after freeing some space.
 428                          */
 429                         if (unlikely(restart)) {
 430                                 if (netif_msg_rx_err(priv))
 431                                         netdev_err(priv->dev, "poll found a"
 432                                                    " duplicate EOQ: %p and %p\n",
 433                                                    restart, desc);
 434                                 goto fatal_error;
 435                         }
 436
 437                         restart = desc->next;
 438                 }
 439
 440                 skb = cpmac_rx_one(priv, desc);
 441                 if (likely(skb)) {
 442                         netif_receive_skb(skb);
 443                         received++;
 444                 }
 445                 desc = desc->next;
 446         }
 447
 448         if (desc != priv->rx_head) {
 449                 /* We freed some buffers, but not the whole ring,
 450                  * add what we did free to the rx list
 451                  */
 452                 desc->prev->hw_next = (u32)0;
 453                 priv->rx_head->prev->hw_next = priv->rx_head->mapping;
 454         }
 455
 456         /* Optimization: If we did not actually process an EOQ (perhaps because
 457          * of quota limits), check to see if the tail of the queue has EOQ set.
 458          * We should immediately restart in that case so that the receiver can
 459          * restart and run in parallel with more packet processing.
 460          * This lets us handle slightly larger bursts before running
 461          * out of ring space (assuming dev->weight < ring_size)
 462          */
 463
 464         if (!restart &&
 465              (priv->rx_head->prev->dataflags & (CPMAC_OWN|CPMAC_EOQ))
 466                     == CPMAC_EOQ &&
 467              (priv->rx_head->dataflags & CPMAC_OWN) != 0) {
 468                 /* reset EOQ so the poll loop (above) doesn't try to
 469                  * restart this when it eventually gets to this descriptor.
 470                  */
 471                 priv->rx_head->prev->dataflags &= ~CPMAC_EOQ;
 472                 restart = priv->rx_head;
 473         }
 474
 475         if (restart) {
 476                 priv->dev->stats.rx_errors++;
 477                 priv->dev->stats.rx_fifo_errors++;
 478                 if (netif_msg_rx_err(priv) && net_ratelimit())
 479                         netdev_warn(priv->dev, "rx dma ring overrun\n");
 480
 481                 if (unlikely((restart->dataflags & CPMAC_OWN) == 0)) {
 482                         if (netif_msg_drv(priv))
 483                                 netdev_err(priv->dev, "cpmac_poll is trying "
 484                                         "to restart rx from a descriptor "
 485                                         "that's not free: %p\n", restart);
 486                         goto fatal_error;
 487                 }
 488
 489                 cpmac_write(priv->regs, CPMAC_RX_PTR(0), restart->mapping);
 490         }
 491
 492         priv->rx_head = desc;
 493         spin_unlock(&priv->rx_lock);
 494         if (unlikely(netif_msg_rx_status(priv)))
 495                 netdev_dbg(priv->dev, "poll processed %d packets\n", received);
 496
 497         if (processed == 0) {
 498                 /* we ran out of packets to read,
 499                  * revert to interrupt-driven mode
 500                  */
 501                 napi_complete(napi);
 502                 cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
 503                 return 0;
 504         }
 505
 506         return 1;
 507
 508 fatal_error:
 509         /* Something went horribly wrong.
 510          * Reset hardware to try to recover rather than wedging.
 511          */
 512         if (netif_msg_drv(priv)) {
 513                 netdev_err(priv->dev, "cpmac_poll is confused. "
 514                            "Resetting hardware\n");
 515                 cpmac_dump_all_desc(priv->dev);
 516                 netdev_dbg(priv->dev, "RX_PTR(0)=0x%08x RX_ACK(0)=0x%08x\n",
 517                            cpmac_read(priv->regs, CPMAC_RX_PTR(0)),
 518                            cpmac_read(priv->regs, CPMAC_RX_ACK(0)));
 519         }
 520
 521         spin_unlock(&priv->rx_lock);
 522         napi_complete(napi);
 523         netif_tx_stop_all_queues(priv->dev);
 524         napi_disable(&priv->napi);
 525
 526         atomic_inc(&priv->reset_pending);
 527         cpmac_hw_stop(priv->dev);
 528         if (!schedule_work(&priv->reset_work))
 529                 atomic_dec(&priv->reset_pending);
 530
 531         return 0;
 532
 533 }
 534
 535 static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
 536 {
 537         int queue;
 538         unsigned int len;
 539         struct cpmac_desc *desc;
 540         struct cpmac_priv *priv = netdev_priv(dev);
 541
 542         if (unlikely(atomic_read(&priv->reset_pending)))
 543                 return NETDEV_TX_BUSY;
 544
 545         if (unlikely(skb_padto(skb, ETH_ZLEN)))
 546                 return NETDEV_TX_OK;
 547
 548         len = max_t(unsigned int, skb->len, ETH_ZLEN);
 549         queue = skb_get_queue_mapping(skb);
 550         netif_stop_subqueue(dev, queue);
 551
 552         desc = &priv->desc_ring[queue];
 553         if (unlikely(desc->dataflags & CPMAC_OWN)) {
 554                 if (netif_msg_tx_err(priv) && net_ratelimit())
 555                         netdev_warn(dev, "tx dma ring full\n");
 556
 557                 return NETDEV_TX_BUSY;
 558         }
 559
 560         spin_lock(&priv->lock);
 561         spin_unlock(&priv->lock);
 562         desc->dataflags = CPMAC_SOP | CPMAC_EOP | CPMAC_OWN;
 563         desc->skb = skb;
 564         desc->data_mapping = dma_map_single(&dev->dev, skb->data, len,
 565                                             DMA_TO_DEVICE);
 566         desc->hw_data = (u32)desc->data_mapping;
 567         desc->datalen = len;
 568         desc->buflen = len;
 569         if (unlikely(netif_msg_tx_queued(priv)))
 570                 netdev_dbg(dev, "sending 0x%p, len=%d\n", skb, skb->len);
 571         if (unlikely(netif_msg_hw(priv)))
 572                 cpmac_dump_desc(dev, desc);
 573         if (unlikely(netif_msg_pktdata(priv)))
 574                 cpmac_dump_skb(dev, skb);
 575         cpmac_write(priv->regs, CPMAC_TX_PTR(queue), (u32)desc->mapping);
 576
 577         return NETDEV_TX_OK;
 578 }
 579
 580 static void cpmac_end_xmit(struct net_device *dev, int queue)
 581 {
 582         struct cpmac_desc *desc;
 583         struct cpmac_priv *priv = netdev_priv(dev);
 584
 585         desc = &priv->desc_ring[queue];
 586         cpmac_write(priv->regs, CPMAC_TX_ACK(queue), (u32)desc->mapping);
 587         if (likely(desc->skb)) {
 588                 spin_lock(&priv->lock);
 589                 dev->stats.tx_packets++;
 590                 dev->stats.tx_bytes += desc->skb->len;
 591                 spin_unlock(&priv->lock);
 592                 dma_unmap_single(&dev->dev, desc->data_mapping, desc->skb->len,
 593                                  DMA_TO_DEVICE);
 594
 595                 if (unlikely(netif_msg_tx_done(priv)))
 596                         netdev_dbg(dev, "sent 0x%p, len=%d\n",
 597                                    desc->skb, desc->skb->len);
 598
 599                 dev_consume_skb_irq(desc->skb);
 600                 desc->skb = NULL;
 601                 if (__netif_subqueue_stopped(dev, queue))
 602                         netif_wake_subqueue(dev, queue);
 603         } else {
 604                 if (netif_msg_tx_err(priv) && net_ratelimit())
 605                         netdev_warn(dev, "end_xmit: spurious interrupt\n");
 606                 if (__netif_subqueue_stopped(dev, queue))
 607                         netif_wake_subqueue(dev, queue);
 608         }
 609 }
 610
 611 static void cpmac_hw_stop(struct net_device *dev)
 612 {
 613         int i;
 614         struct cpmac_priv *priv = netdev_priv(dev);
 615         struct plat_cpmac_data *pdata = dev_get_platdata(&priv->pdev->dev);
 616
 617         ar7_device_reset(pdata->reset_bit);
 618         cpmac_write(priv->regs, CPMAC_RX_CONTROL,
 619                     cpmac_read(priv->regs, CPMAC_RX_CONTROL) & ~1);
 620         cpmac_write(priv->regs, CPMAC_TX_CONTROL,
 621                     cpmac_read(priv->regs, CPMAC_TX_CONTROL) & ~1);
 622         for (i = 0; i < 8; i++) {
 623                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
 624                 cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
 625         }
 626         cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
 627         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
 628         cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
 629         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 630         cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
 631                     cpmac_read(priv->regs, CPMAC_MAC_CONTROL) & ~MAC_MII);
 632 }
 633
 634 static void cpmac_hw_start(struct net_device *dev)
 635 {
 636         int i;
 637         struct cpmac_priv *priv = netdev_priv(dev);
 638         struct plat_cpmac_data *pdata = dev_get_platdata(&priv->pdev->dev);
 639
 640         ar7_device_reset(pdata->reset_bit);
 641         for (i = 0; i < 8; i++) {
 642                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
 643                 cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
 644         }
 645         cpmac_write(priv->regs, CPMAC_RX_PTR(0), priv->rx_head->mapping);
 646
 647         cpmac_write(priv->regs, CPMAC_MBP, MBP_RXSHORT | MBP_RXBCAST |
 648                     MBP_RXMCAST);
 649         cpmac_write(priv->regs, CPMAC_BUFFER_OFFSET, 0);
 650         for (i = 0; i < 8; i++)
 651                 cpmac_write(priv->regs, CPMAC_MAC_ADDR_LO(i), dev->dev_addr[5]);
 652         cpmac_write(priv->regs, CPMAC_MAC_ADDR_MID, dev->dev_addr[4]);
 653         cpmac_write(priv->regs, CPMAC_MAC_ADDR_HI, dev->dev_addr[0] |
 654                     (dev->dev_addr[1] << 8) | (dev->dev_addr[2] << 16) |
 655                     (dev->dev_addr[3] << 24));
 656         cpmac_write(priv->regs, CPMAC_MAX_LENGTH, CPMAC_SKB_SIZE);
 657         cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
 658         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
 659         cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
 660         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 661         cpmac_write(priv->regs, CPMAC_UNICAST_ENABLE, 1);
 662         cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
 663         cpmac_write(priv->regs, CPMAC_TX_INT_ENABLE, 0xff);
 664         cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
 665
 666         cpmac_write(priv->regs, CPMAC_RX_CONTROL,
 667                     cpmac_read(priv->regs, CPMAC_RX_CONTROL) | 1);
 668         cpmac_write(priv->regs, CPMAC_TX_CONTROL,
 669                     cpmac_read(priv->regs, CPMAC_TX_CONTROL) | 1);
 670         cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
 671                     cpmac_read(priv->regs, CPMAC_MAC_CONTROL) | MAC_MII |
 672                     MAC_FDX);
 673 }
 674
 675 static void cpmac_clear_rx(struct net_device *dev)
 676 {
 677         struct cpmac_priv *priv = netdev_priv(dev);
 678         struct cpmac_desc *desc;
 679         int i;
 680
 681         if (unlikely(!priv->rx_head))
 682                 return;
 683         desc = priv->rx_head;
 684         for (i = 0; i < priv->ring_size; i++) {
 685                 if ((desc->dataflags & CPMAC_OWN) == 0) {
 686                         if (netif_msg_rx_err(priv) && net_ratelimit())
 687                                 netdev_warn(dev, "packet dropped\n");
 688                         if (unlikely(netif_msg_hw(priv)))
 689                                 cpmac_dump_desc(dev, desc);
 690                         desc->dataflags = CPMAC_OWN;
 691                         dev->stats.rx_dropped++;
 692                 }
 693                 desc->hw_next = desc->next->mapping;
 694                 desc = desc->next;
 695         }
 696         priv->rx_head->prev->hw_next = 0;
 697 }
 698
 699 static void cpmac_clear_tx(struct net_device *dev)
 700 {
 701         struct cpmac_priv *priv = netdev_priv(dev);
 702         int i;
 703
 704         if (unlikely(!priv->desc_ring))
 705                 return;
 706         for (i = 0; i < CPMAC_QUEUES; i++) {
 707                 priv->desc_ring[i].dataflags = 0;
 708                 if (priv->desc_ring[i].skb) {
 709                         dev_kfree_skb_any(priv->desc_ring[i].skb);
 710                         priv->desc_ring[i].skb = NULL;
 711                 }
 712         }
 713 }
 714
 715 static void cpmac_hw_error(struct work_struct *work)
 716 {
 717         struct cpmac_priv *priv =
 718                 container_of(work, struct cpmac_priv, reset_work);
 719
 720         spin_lock(&priv->rx_lock);
 721         cpmac_clear_rx(priv->dev);
 722         spin_unlock(&priv->rx_lock);
 723         cpmac_clear_tx(priv->dev);
 724         cpmac_hw_start(priv->dev);
 725         barrier();
 726         atomic_dec(&priv->reset_pending);
 727
 728         netif_tx_wake_all_queues(priv->dev);
 729         cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
 730 }
 731
 732 static void cpmac_check_status(struct net_device *dev)
 733 {
 734         struct cpmac_priv *priv = netdev_priv(dev);
 735
 736         u32 macstatus = cpmac_read(priv->regs, CPMAC_MAC_STATUS);
 737         int rx_channel = (macstatus >> 8) & 7;
 738         int rx_code = (macstatus >> 12) & 15;
 739         int tx_channel = (macstatus >> 16) & 7;
 740         int tx_code = (macstatus >> 20) & 15;
 741
 742         if (rx_code || tx_code) {
 743                 if (netif_msg_drv(priv) && net_ratelimit()) {
 744                         /* Can't find any documentation on what these
 745                          * error codes actually are. So just log them and hope..
 746                          */
 747                         if (rx_code)
 748                                 netdev_warn(dev, "host error %d on rx "
 749                                         "channel %d (macstatus %08x), resetting\n",
 750                                         rx_code, rx_channel, macstatus);
 751                         if (tx_code)
 752                                 netdev_warn(dev, "host error %d on tx "
 753                                         "channel %d (macstatus %08x), resetting\n",
 754                                         tx_code, tx_channel, macstatus);
 755                 }
 756
 757                 netif_tx_stop_all_queues(dev);
 758                 cpmac_hw_stop(dev);
 759                 if (schedule_work(&priv->reset_work))
 760                         atomic_inc(&priv->reset_pending);
 761                 if (unlikely(netif_msg_hw(priv)))
 762                         cpmac_dump_regs(dev);
 763         }
 764         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 765 }
 766
 767 static irqreturn_t cpmac_irq(int irq, void *dev_id)
 768 {
 769         struct net_device *dev = dev_id;
 770         struct cpmac_priv *priv;
 771         int queue;
 772         u32 status;
 773
 774         priv = netdev_priv(dev);
 775
 776         status = cpmac_read(priv->regs, CPMAC_MAC_INT_VECTOR);
 777
 778         if (unlikely(netif_msg_intr(priv)))
 779                 netdev_dbg(dev, "interrupt status: 0x%08x\n", status);
 780
 781         if (status & MAC_INT_TX)
 782                 cpmac_end_xmit(dev, (status & 7));
 783
 784         if (status & MAC_INT_RX) {
 785                 queue = (status >> 8) & 7;
 786                 if (napi_schedule_prep(&priv->napi)) {
 787                         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 1 << queue);
 788                         __napi_schedule(&priv->napi);
 789                 }
 790         }
 791
 792         cpmac_write(priv->regs, CPMAC_MAC_EOI_VECTOR, 0);
 793
 794         if (unlikely(status & (MAC_INT_HOST | MAC_INT_STATUS)))
 795                 cpmac_check_status(dev);
 796
 797         return IRQ_HANDLED;
 798 }
 799
 800 static void cpmac_tx_timeout(struct net_device *dev)
 801 {
 802         struct cpmac_priv *priv = netdev_priv(dev);
 803
 804         spin_lock(&priv->lock);
 805         dev->stats.tx_errors++;
 806         spin_unlock(&priv->lock);
 807         if (netif_msg_tx_err(priv) && net_ratelimit())
 808                 netdev_warn(dev, "transmit timeout\n");
 809
 810         atomic_inc(&priv->reset_pending);
 811         barrier();
 812         cpmac_clear_tx(dev);
 813         barrier();
 814         atomic_dec(&priv->reset_pending);
 815
 816         netif_tx_wake_all_queues(priv->dev);
 817 }
 818
 819 static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 820 {
 821         if (!(netif_running(dev)))
 822                 return -EINVAL;
 823         if (!dev->phydev)
 824                 return -EINVAL;
 825
 826         return phy_mii_ioctl(dev->phydev, ifr, cmd);
 827 }
 828
 829 static void cpmac_get_ringparam(struct net_device *dev,
 830                                                 struct ethtool_ringparam *ring)
 831 {
 832         struct cpmac_priv *priv = netdev_priv(dev);
 833
 834         ring->rx_max_pending = 1024;
 835         ring->rx_mini_max_pending = 1;
 836         ring->rx_jumbo_max_pending = 1;
 837         ring->tx_max_pending = 1;
 838
 839         ring->rx_pending = priv->ring_size;
 840         ring->rx_mini_pending = 1;
 841         ring->rx_jumbo_pending = 1;
 842         ring->tx_pending = 1;
 843 }
 844
 845 static int cpmac_set_ringparam(struct net_device *dev,
 846                                                 struct ethtool_ringparam *ring)
 847 {
 848         struct cpmac_priv *priv = netdev_priv(dev);
 849
 850         if (netif_running(dev))
 851                 return -EBUSY;
 852         priv->ring_size = ring->rx_pending;
 853
 854         return 0;
 855 }
 856
 857 static void cpmac_get_drvinfo(struct net_device *dev,
 858                               struct ethtool_drvinfo *info)
 859 {
 860         strlcpy(info->driver, "cpmac", sizeof(info->driver));
 861         strlcpy(info->version, CPMAC_VERSION, sizeof(info->version));
 862         snprintf(info->bus_info, sizeof(info->bus_info), "%s", "cpmac");
 863 }
 864
 865 static const struct ethtool_ops cpmac_ethtool_ops = {
 866         .get_drvinfo = cpmac_get_drvinfo,
 867         .get_link = ethtool_op_get_link,
 868         .get_ringparam = cpmac_get_ringparam,
 869         .set_ringparam = cpmac_set_ringparam,
 870         .get_link_ksettings = phy_ethtool_get_link_ksettings,
 871         .set_link_ksettings = phy_ethtool_set_link_ksettings,
 872 };
 873
 874 static void cpmac_adjust_link(struct net_device *dev)
 875 {
 876         struct cpmac_priv *priv = netdev_priv(dev);
 877         int new_state = 0;
 878
 879         spin_lock(&priv->lock);
 880         if (dev->phydev->link) {
 881                 netif_tx_start_all_queues(dev);
 882                 if (dev->phydev->duplex != priv->oldduplex) {
 883                         new_state = 1;
 884                         priv->oldduplex = dev->phydev->duplex;
 885                 }
 886
 887                 if (dev->phydev->speed != priv->oldspeed) {
 888                         new_state = 1;
 889                         priv->oldspeed = dev->phydev->speed;
 890                 }
 891
 892                 if (!priv->oldlink) {
 893                         new_state = 1;
 894                         priv->oldlink = 1;
 895                 }
 896         } else if (priv->oldlink) {
 897                 new_state = 1;
 898                 priv->oldlink = 0;
 899                 priv->oldspeed = 0;
 900                 priv->oldduplex = -1;
 901         }
 902
 903         if (new_state && netif_msg_link(priv) && net_ratelimit())
 904                 phy_print_status(dev->phydev);
 905
 906         spin_unlock(&priv->lock);
 907 }
 908
 909 static int cpmac_open(struct net_device *dev)
 910 {
 911         int i, size, res;
 912         struct cpmac_priv *priv = netdev_priv(dev);
 913         struct resource *mem;
 914         struct cpmac_desc *desc;
 915         struct sk_buff *skb;
 916
 917         mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
 918         if (!request_mem_region(mem->start, resource_size(mem), dev->name)) {
 919                 if (netif_msg_drv(priv))
 920                         netdev_err(dev, "failed to request registers\n");
 921
 922                 res = -ENXIO;
 923                 goto fail_reserve;
 924         }
 925
 926         priv->regs = ioremap(mem->start, resource_size(mem));
 927         if (!priv->regs) {
 928                 if (netif_msg_drv(priv))
 929                         netdev_err(dev, "failed to remap registers\n");
 930
 931                 res = -ENXIO;
 932                 goto fail_remap;
 933         }
 934
 935         size = priv->ring_size + CPMAC_QUEUES;
 936         priv->desc_ring = dma_alloc_coherent(&dev->dev,
 937                                              sizeof(struct cpmac_desc) * size,
 938                                              &priv->dma_ring,
 939                                              GFP_KERNEL);
 940         if (!priv->desc_ring) {
 941                 res = -ENOMEM;
 942                 goto fail_alloc;
 943         }
 944
 945         for (i = 0; i < size; i++)
 946                 priv->desc_ring[i].mapping = priv->dma_ring + sizeof(*desc) * i;
 947
 948         priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
 949         for (i = 0, desc = priv->rx_head; i < priv->ring_size; i++, desc++) {
 950                 skb = netdev_alloc_skb_ip_align(dev, CPMAC_SKB_SIZE);
 951                 if (unlikely(!skb)) {
 952                         res = -ENOMEM;
 953                         goto fail_desc;
 954                 }
 955                 desc->skb = skb;
 956                 desc->data_mapping = dma_map_single(&dev->dev, skb->data,
 957                                                     CPMAC_SKB_SIZE,
 958                                                     DMA_FROM_DEVICE);
 959                 desc->hw_data = (u32)desc->data_mapping;
 960                 desc->buflen = CPMAC_SKB_SIZE;
 961                 desc->dataflags = CPMAC_OWN;
 962                 desc->next = &priv->rx_head[(i + 1) % priv->ring_size];
 963                 desc->next->prev = desc;
 964                 desc->hw_next = (u32)desc->next->mapping;
 965         }
 966
 967         priv->rx_head->prev->hw_next = (u32)0;
 968
 969         res = request_irq(dev->irq, cpmac_irq, IRQF_SHARED, dev->name, dev);
 970         if (res) {
 971                 if (netif_msg_drv(priv))
 972                         netdev_err(dev, "failed to obtain irq\n");
 973
 974                 goto fail_irq;
 975         }
 976
 977         atomic_set(&priv->reset_pending, 0);
 978         INIT_WORK(&priv->reset_work, cpmac_hw_error);
 979         cpmac_hw_start(dev);
 980
 981         napi_enable(&priv->napi);
 982         phy_start(dev->phydev);
 983
 984         return 0;
 985
 986 fail_irq:
 987 fail_desc:
 988         for (i = 0; i < priv->ring_size; i++) {
 989                 if (priv->rx_head[i].skb) {
 990                         dma_unmap_single(&dev->dev,
 991                                          priv->rx_head[i].data_mapping,
 992                                          CPMAC_SKB_SIZE,
 993                                          DMA_FROM_DEVICE);
 994                         kfree_skb(priv->rx_head[i].skb);
 995                 }
 996         }
 997         dma_free_coherent(&dev->dev, sizeof(struct cpmac_desc) * size,
 998                           priv->desc_ring, priv->dma_ring);
 999
1000 fail_alloc:
1001         iounmap(priv->regs);
1002
1003 fail_remap:
1004         release_mem_region(mem->start, resource_size(mem));
1005
1006 fail_reserve:
1007         return res;
1008 }
1009
1010 static int cpmac_stop(struct net_device *dev)
1011 {
1012         int i;
1013         struct cpmac_priv *priv = netdev_priv(dev);
1014         struct resource *mem;
1015
1016         netif_tx_stop_all_queues(dev);
1017
1018         cancel_work_sync(&priv->reset_work);
1019         napi_disable(&priv->napi);
1020         phy_stop(dev->phydev);
1021
1022         cpmac_hw_stop(dev);
1023
1024         for (i = 0; i < 8; i++)
1025                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
1026         cpmac_write(priv->regs, CPMAC_RX_PTR(0), 0);
1027         cpmac_write(priv->regs, CPMAC_MBP, 0);
1028
1029         free_irq(dev->irq, dev);
1030         iounmap(priv->regs);
1031         mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
1032         release_mem_region(mem->start, resource_size(mem));
1033         priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
1034         for (i = 0; i < priv->ring_size; i++) {
1035                 if (priv->rx_head[i].skb) {
1036                         dma_unmap_single(&dev->dev,
1037                                          priv->rx_head[i].data_mapping,
1038                                          CPMAC_SKB_SIZE,
1039                                          DMA_FROM_DEVICE);
1040                         kfree_skb(priv->rx_head[i].skb);
1041                 }
1042         }
1043
1044         dma_free_coherent(&dev->dev, sizeof(struct cpmac_desc) *
1045                           (CPMAC_QUEUES + priv->ring_size),
1046                           priv->desc_ring, priv->dma_ring);
1047
1048         return 0;
1049 }
1050
1051 static const struct net_device_ops cpmac_netdev_ops = {
1052         .ndo_open               = cpmac_open,
1053         .ndo_stop               = cpmac_stop,
1054         .ndo_start_xmit         = cpmac_start_xmit,
1055         .ndo_tx_timeout         = cpmac_tx_timeout,
1056         .ndo_set_rx_mode        = cpmac_set_multicast_list,
1057         .ndo_do_ioctl           = cpmac_ioctl,
1058         .ndo_validate_addr      = eth_validate_addr,
1059         .ndo_set_mac_address    = eth_mac_addr,
1060 };
1061
1062 static int external_switch;
1063
1064 static int cpmac_probe(struct platform_device *pdev)
1065 {
1066         int rc, phy_id;
1067         char mdio_bus_id[MII_BUS_ID_SIZE];
1068         struct resource *mem;
1069         struct cpmac_priv *priv;
1070         struct net_device *dev;
1071         struct plat_cpmac_data *pdata;
1072         struct phy_device *phydev = NULL;
1073
1074         pdata = dev_get_platdata(&pdev->dev);
1075
1076         if (external_switch || dumb_switch) {
1077                 strncpy(mdio_bus_id, "fixed-0", MII_BUS_ID_SIZE); /* fixed phys bus */
1078                 phy_id = pdev->id;
1079         } else {
1080                 for (phy_id = 0; phy_id < PHY_MAX_ADDR; phy_id++) {
1081                         if (!(pdata->phy_mask & (1 << phy_id)))
1082                                 continue;
1083                         if (!mdiobus_get_phy(cpmac_mii, phy_id))
1084                                 continue;
1085                         strncpy(mdio_bus_id, cpmac_mii->id, MII_BUS_ID_SIZE);
1086                         break;
1087                 }
1088         }
1089
1090         if (phy_id == PHY_MAX_ADDR) {
1091                 dev_err(&pdev->dev, "no PHY present, falling back "
1092                         "to switch on MDIO bus 0\n");
1093                 strncpy(mdio_bus_id, "fixed-0", MII_BUS_ID_SIZE); /* fixed phys bus */
1094                 phy_id = pdev->id;
1095         }
1096         mdio_bus_id[sizeof(mdio_bus_id) - 1] = '\0';
1097
1098         dev = alloc_etherdev_mq(sizeof(*priv), CPMAC_QUEUES);
1099         if (!dev)
1100                 return -ENOMEM;
1101
1102         SET_NETDEV_DEV(dev, &pdev->dev);
1103         platform_set_drvdata(pdev, dev);
1104         priv = netdev_priv(dev);
1105
1106         priv->pdev = pdev;
1107         mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
1108         if (!mem) {
1109                 rc = -ENODEV;
1110                 goto fail;
1111         }
1112
1113         dev->irq = platform_get_irq_byname(pdev, "irq");
1114
1115         dev->netdev_ops = &cpmac_netdev_ops;
1116         dev->ethtool_ops = &cpmac_ethtool_ops;
1117
1118         netif_napi_add(dev, &priv->napi, cpmac_poll, 64);
1119
1120         spin_lock_init(&priv->lock);
1121         spin_lock_init(&priv->rx_lock);
1122         priv->dev = dev;
1123         priv->ring_size = 64;
1124         priv->msg_enable = netif_msg_init(debug_level, 0xff);
1125         memcpy(dev->dev_addr, pdata->dev_addr, sizeof(pdata->dev_addr));
1126
1127         snprintf(priv->phy_name, MII_BUS_ID_SIZE, PHY_ID_FMT,
1128                                                 mdio_bus_id, phy_id);
1129
1130         phydev = phy_connect(dev, priv->phy_name, cpmac_adjust_link,
1131                              PHY_INTERFACE_MODE_MII);
1132
1133         if (IS_ERR(phydev)) {
1134                 if (netif_msg_drv(priv))
1135                         dev_err(&pdev->dev, "Could not attach to PHY\n");
1136
1137                 rc = PTR_ERR(phydev);
1138                 goto fail;
1139         }
1140
1141         rc = register_netdev(dev);
1142         if (rc) {
1143                 dev_err(&pdev->dev, "Could not register net device\n");
1144                 goto fail;
1145         }
1146
1147         if (netif_msg_probe(priv)) {
1148                 dev_info(&pdev->dev, "regs: %p, irq: %d, phy: %s, "
1149                          "mac: %pM\n", (void *)mem->start, dev->irq,
1150                          priv->phy_name, dev->dev_addr);
1151         }
1152
1153         return 0;
1154
1155 fail:
1156         free_netdev(dev);
1157         return rc;
1158 }
1159
1160 static int cpmac_remove(struct platform_device *pdev)
1161 {
1162         struct net_device *dev = platform_get_drvdata(pdev);
1163
1164         unregister_netdev(dev);
1165         free_netdev(dev);
1166
1167         return 0;
1168 }
1169
1170 static struct platform_driver cpmac_driver = {
1171         .driver = {
1172                 .name   = "cpmac",
1173         },
1174         .probe  = cpmac_probe,
1175         .remove = cpmac_remove,
1176 };
1177
1178 int cpmac_init(void)
1179 {
1180         u32 mask;
1181         int i, res;
1182
1183         cpmac_mii = mdiobus_alloc();
1184         if (cpmac_mii == NULL)
1185                 return -ENOMEM;
1186
1187         cpmac_mii->name = "cpmac-mii";
1188         cpmac_mii->read = cpmac_mdio_read;
1189         cpmac_mii->write = cpmac_mdio_write;
1190         cpmac_mii->reset = cpmac_mdio_reset;
1191
1192         cpmac_mii->priv = ioremap(AR7_REGS_MDIO, 256);
1193
1194         if (!cpmac_mii->priv) {
1195                 pr_err("Can't ioremap mdio registers\n");
1196                 res = -ENXIO;
1197                 goto fail_alloc;
1198         }
1199
1200         /* FIXME: unhardcode gpio&reset bits */
1201         ar7_gpio_disable(26);
1202         ar7_gpio_disable(27);
1203         ar7_device_reset(AR7_RESET_BIT_CPMAC_LO);
1204         ar7_device_reset(AR7_RESET_BIT_CPMAC_HI);
1205         ar7_device_reset(AR7_RESET_BIT_EPHY);
1206
1207         cpmac_mii->reset(cpmac_mii);
1208
1209         for (i = 0; i < 300; i++) {
1210                 mask = cpmac_read(cpmac_mii->priv, CPMAC_MDIO_ALIVE);
1211                 if (mask)
1212                         break;
1213                 else
1214                         msleep(10);
1215         }
1216
1217         mask &= 0x7fffffff;
1218         if (mask & (mask - 1)) {
1219                 external_switch = 1;
1220                 mask = 0;
1221         }
1222
1223         cpmac_mii->phy_mask = ~(mask | 0x80000000);
1224         snprintf(cpmac_mii->id, MII_BUS_ID_SIZE, "cpmac-1");
1225
1226         res = mdiobus_register(cpmac_mii);
1227         if (res)
1228                 goto fail_mii;
1229
1230         res = platform_driver_register(&cpmac_driver);
1231         if (res)
1232                 goto fail_cpmac;
1233
1234         return 0;
1235
1236 fail_cpmac:
1237         mdiobus_unregister(cpmac_mii);
1238
1239 fail_mii:
1240         iounmap(cpmac_mii->priv);
1241
1242 fail_alloc:
1243         mdiobus_free(cpmac_mii);
1244
1245         return res;
1246 }
1247
1248 void cpmac_exit(void)
1249 {
1250         platform_driver_unregister(&cpmac_driver);
1251         mdiobus_unregister(cpmac_mii);
1252         iounmap(cpmac_mii->priv);
1253         mdiobus_free(cpmac_mii);
1254 }
1255
1256 module_init(cpmac_init);
1257 module_exit(cpmac_exit);