drivers/net/ethernet/ti/cpmac.c

   1 /*
   2  * Copyright (C) 2006, 2007 Eugene Konev
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/moduleparam.h>
  22
  23 #include <linux/sched.h>
  24 #include <linux/kernel.h>
  25 #include <linux/slab.h>
  26 #include <linux/errno.h>
  27 #include <linux/types.h>
  28 #include <linux/delay.h>
  29
  30 #include <linux/netdevice.h>
  31 #include <linux/if_vlan.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/ethtool.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/mii.h>
  36 #include <linux/phy.h>
  37 #include <linux/phy_fixed.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/clk.h>
  41 #include <linux/gpio.h>
  42 #include <linux/atomic.h>
  43
  44 #include <asm/mach-ar7/ar7.h>
  45
  46 MODULE_AUTHOR("Eugene Konev <ejka@imfi.kspu.ru>");
  47 MODULE_DESCRIPTION("TI AR7 ethernet driver (CPMAC)");
  48 MODULE_LICENSE("GPL");
  49 MODULE_ALIAS("platform:cpmac");
  50
  51 static int debug_level = 8;
  52 static int dumb_switch;
  53
  54 /* Next 2 are only used in cpmac_probe, so it's pointless to change them */
  55 module_param(debug_level, int, 0444);
  56 module_param(dumb_switch, int, 0444);
  57
  58 MODULE_PARM_DESC(debug_level, "Number of NETIF_MSG bits to enable");
  59 MODULE_PARM_DESC(dumb_switch, "Assume switch is not connected to MDIO bus");
  60
  61 #define CPMAC_VERSION "0.5.2"
  62 /* frame size + 802.1q tag + FCS size */
  63 #define CPMAC_SKB_SIZE          (ETH_FRAME_LEN + ETH_FCS_LEN + VLAN_HLEN)
  64 #define CPMAC_QUEUES    8
  65
  66 /* Ethernet registers */
  67 #define CPMAC_TX_CONTROL                0x0004
  68 #define CPMAC_TX_TEARDOWN               0x0008
  69 #define CPMAC_RX_CONTROL                0x0014
  70 #define CPMAC_RX_TEARDOWN               0x0018
  71 #define CPMAC_MBP                       0x0100
  72 #define MBP_RXPASSCRC                   0x40000000
  73 #define MBP_RXQOS                       0x20000000
  74 #define MBP_RXNOCHAIN                   0x10000000
  75 #define MBP_RXCMF                       0x01000000
  76 #define MBP_RXSHORT                     0x00800000
  77 #define MBP_RXCEF                       0x00400000
  78 #define MBP_RXPROMISC                   0x00200000
  79 #define MBP_PROMISCCHAN(channel)        (((channel) & 0x7) << 16)
  80 #define MBP_RXBCAST                     0x00002000
  81 #define MBP_BCASTCHAN(channel)          (((channel) & 0x7) << 8)
  82 #define MBP_RXMCAST                     0x00000020
  83 #define MBP_MCASTCHAN(channel)          ((channel) & 0x7)
  84 #define CPMAC_UNICAST_ENABLE            0x0104
  85 #define CPMAC_UNICAST_CLEAR             0x0108
  86 #define CPMAC_MAX_LENGTH                0x010c
  87 #define CPMAC_BUFFER_OFFSET             0x0110
  88 #define CPMAC_MAC_CONTROL               0x0160
  89 #define MAC_TXPTYPE                     0x00000200
  90 #define MAC_TXPACE                      0x00000040
  91 #define MAC_MII                         0x00000020
  92 #define MAC_TXFLOW                      0x00000010
  93 #define MAC_RXFLOW                      0x00000008
  94 #define MAC_MTEST                       0x00000004
  95 #define MAC_LOOPBACK                    0x00000002
  96 #define MAC_FDX                         0x00000001
  97 #define CPMAC_MAC_STATUS                0x0164
  98 #define MAC_STATUS_QOS                  0x00000004
  99 #define MAC_STATUS_RXFLOW               0x00000002
 100 #define MAC_STATUS_TXFLOW               0x00000001
 101 #define CPMAC_TX_INT_ENABLE             0x0178
 102 #define CPMAC_TX_INT_CLEAR              0x017c
 103 #define CPMAC_MAC_INT_VECTOR            0x0180
 104 #define MAC_INT_STATUS                  0x00080000
 105 #define MAC_INT_HOST                    0x00040000
 106 #define MAC_INT_RX                      0x00020000
 107 #define MAC_INT_TX                      0x00010000
 108 #define CPMAC_MAC_EOI_VECTOR            0x0184
 109 #define CPMAC_RX_INT_ENABLE             0x0198
 110 #define CPMAC_RX_INT_CLEAR              0x019c
 111 #define CPMAC_MAC_INT_ENABLE            0x01a8
 112 #define CPMAC_MAC_INT_CLEAR             0x01ac
 113 #define CPMAC_MAC_ADDR_LO(channel)      (0x01b0 + (channel) * 4)
 114 #define CPMAC_MAC_ADDR_MID              0x01d0
 115 #define CPMAC_MAC_ADDR_HI               0x01d4
 116 #define CPMAC_MAC_HASH_LO               0x01d8
 117 #define CPMAC_MAC_HASH_HI               0x01dc
 118 #define CPMAC_TX_PTR(channel)           (0x0600 + (channel) * 4)
 119 #define CPMAC_RX_PTR(channel)           (0x0620 + (channel) * 4)
 120 #define CPMAC_TX_ACK(channel)           (0x0640 + (channel) * 4)
 121 #define CPMAC_RX_ACK(channel)           (0x0660 + (channel) * 4)
 122 #define CPMAC_REG_END                   0x0680
 123
 124 /* Rx/Tx statistics
 125  * TODO: use some of them to fill stats in cpmac_stats()
 126  */
 127 #define CPMAC_STATS_RX_GOOD             0x0200
 128 #define CPMAC_STATS_RX_BCAST            0x0204
 129 #define CPMAC_STATS_RX_MCAST            0x0208
 130 #define CPMAC_STATS_RX_PAUSE            0x020c
 131 #define CPMAC_STATS_RX_CRC              0x0210
 132 #define CPMAC_STATS_RX_ALIGN            0x0214
 133 #define CPMAC_STATS_RX_OVER             0x0218
 134 #define CPMAC_STATS_RX_JABBER           0x021c
 135 #define CPMAC_STATS_RX_UNDER            0x0220
 136 #define CPMAC_STATS_RX_FRAG             0x0224
 137 #define CPMAC_STATS_RX_FILTER           0x0228
 138 #define CPMAC_STATS_RX_QOSFILTER        0x022c
 139 #define CPMAC_STATS_RX_OCTETS           0x0230
 140
 141 #define CPMAC_STATS_TX_GOOD             0x0234
 142 #define CPMAC_STATS_TX_BCAST            0x0238
 143 #define CPMAC_STATS_TX_MCAST            0x023c
 144 #define CPMAC_STATS_TX_PAUSE            0x0240
 145 #define CPMAC_STATS_TX_DEFER            0x0244
 146 #define CPMAC_STATS_TX_COLLISION        0x0248
 147 #define CPMAC_STATS_TX_SINGLECOLL       0x024c
 148 #define CPMAC_STATS_TX_MULTICOLL        0x0250
 149 #define CPMAC_STATS_TX_EXCESSCOLL       0x0254
 150 #define CPMAC_STATS_TX_LATECOLL         0x0258
 151 #define CPMAC_STATS_TX_UNDERRUN         0x025c
 152 #define CPMAC_STATS_TX_CARRIERSENSE     0x0260
 153 #define CPMAC_STATS_TX_OCTETS           0x0264
 154
 155 #define cpmac_read(base, reg)           (readl((void __iomem *)(base) + (reg)))
 156 #define cpmac_write(base, reg, val)     (writel(val, (void __iomem *)(base) + \
 157                                                 (reg)))
 158
 159 /* MDIO bus */
 160 #define CPMAC_MDIO_VERSION              0x0000
 161 #define CPMAC_MDIO_CONTROL              0x0004
 162 #define MDIOC_IDLE                      0x80000000
 163 #define MDIOC_ENABLE                    0x40000000
 164 #define MDIOC_PREAMBLE                  0x00100000
 165 #define MDIOC_FAULT                     0x00080000
 166 #define MDIOC_FAULTDETECT               0x00040000
 167 #define MDIOC_INTTEST                   0x00020000
 168 #define MDIOC_CLKDIV(div)               ((div) & 0xff)
 169 #define CPMAC_MDIO_ALIVE                0x0008
 170 #define CPMAC_MDIO_LINK                 0x000c
 171 #define CPMAC_MDIO_ACCESS(channel)      (0x0080 + (channel) * 8)
 172 #define MDIO_BUSY                       0x80000000
 173 #define MDIO_WRITE                      0x40000000
 174 #define MDIO_REG(reg)                   (((reg) & 0x1f) << 21)
 175 #define MDIO_PHY(phy)                   (((phy) & 0x1f) << 16)
 176 #define MDIO_DATA(data)                 ((data) & 0xffff)
 177 #define CPMAC_MDIO_PHYSEL(channel)      (0x0084 + (channel) * 8)
 178 #define PHYSEL_LINKSEL                  0x00000040
 179 #define PHYSEL_LINKINT                  0x00000020
 180
 181 struct cpmac_desc {
 182         u32 hw_next;
 183         u32 hw_data;
 184         u16 buflen;
 185         u16 bufflags;
 186         u16 datalen;
 187         u16 dataflags;
 188 #define CPMAC_SOP                       0x8000
 189 #define CPMAC_EOP                       0x4000
 190 #define CPMAC_OWN                       0x2000
 191 #define CPMAC_EOQ                       0x1000
 192         struct sk_buff *skb;
 193         struct cpmac_desc *next;
 194         struct cpmac_desc *prev;
 195         dma_addr_t mapping;
 196         dma_addr_t data_mapping;
 197 };
 198
 199 struct cpmac_priv {
 200         spinlock_t lock;
 201         spinlock_t rx_lock;
 202         struct cpmac_desc *rx_head;
 203         int ring_size;
 204         struct cpmac_desc *desc_ring;
 205         dma_addr_t dma_ring;
 206         void __iomem *regs;
 207         struct mii_bus *mii_bus;
 208         struct phy_device *phy;
 209         char phy_name[MII_BUS_ID_SIZE + 3];
 210         int oldlink, oldspeed, oldduplex;
 211         u32 msg_enable;
 212         struct net_device *dev;
 213         struct work_struct reset_work;
 214         struct platform_device *pdev;
 215         struct napi_struct napi;
 216         atomic_t reset_pending;
 217 };
 218
 219 static irqreturn_t cpmac_irq(int, void *);
 220 static void cpmac_hw_start(struct net_device *dev);
 221 static void cpmac_hw_stop(struct net_device *dev);
 222 static int cpmac_stop(struct net_device *dev);
 223 static int cpmac_open(struct net_device *dev);
 224
 225 static void cpmac_dump_regs(struct net_device *dev)
 226 {
 227         int i;
 228         struct cpmac_priv *priv = netdev_priv(dev);
 229
 230         for (i = 0; i < CPMAC_REG_END; i += 4) {
 231                 if (i % 16 == 0) {
 232                         if (i)
 233                                 printk("\n");
 234                         printk("%s: reg[%p]:", dev->name, priv->regs + i);
 235                 }
 236                 printk(" %08x", cpmac_read(priv->regs, i));
 237         }
 238         printk("\n");
 239 }
 240
 241 static void cpmac_dump_desc(struct net_device *dev, struct cpmac_desc *desc)
 242 {
 243         int i;
 244
 245         printk("%s: desc[%p]:", dev->name, desc);
 246         for (i = 0; i < sizeof(*desc) / 4; i++)
 247                 printk(" %08x", ((u32 *)desc)[i]);
 248         printk("\n");
 249 }
 250
 251 static void cpmac_dump_all_desc(struct net_device *dev)
 252 {
 253         struct cpmac_priv *priv = netdev_priv(dev);
 254         struct cpmac_desc *dump = priv->rx_head;
 255
 256         do {
 257                 cpmac_dump_desc(dev, dump);
 258                 dump = dump->next;
 259         } while (dump != priv->rx_head);
 260 }
 261
 262 static void cpmac_dump_skb(struct net_device *dev, struct sk_buff *skb)
 263 {
 264         int i;
 265
 266         printk("%s: skb 0x%p, len=%d\n", dev->name, skb, skb->len);
 267         for (i = 0; i < skb->len; i++) {
 268                 if (i % 16 == 0) {
 269                         if (i)
 270                                 printk("\n");
 271                         printk("%s: data[%p]:", dev->name, skb->data + i);
 272                 }
 273                 printk(" %02x", ((u8 *)skb->data)[i]);
 274         }
 275         printk("\n");
 276 }
 277
 278 static int cpmac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 279 {
 280         u32 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_REG(reg) |
 285                     MDIO_PHY(phy_id));
 286         while ((val = cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0))) & MDIO_BUSY)
 287                 cpu_relax();
 288
 289         return MDIO_DATA(val);
 290 }
 291
 292 static int cpmac_mdio_write(struct mii_bus *bus, int phy_id,
 293                             int reg, u16 val)
 294 {
 295         while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
 296                 cpu_relax();
 297         cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_WRITE |
 298                     MDIO_REG(reg) | MDIO_PHY(phy_id) | MDIO_DATA(val));
 299
 300         return 0;
 301 }
 302
 303 static int cpmac_mdio_reset(struct mii_bus *bus)
 304 {
 305         struct clk *cpmac_clk;
 306
 307         cpmac_clk = clk_get(&bus->dev, "cpmac");
 308         if (IS_ERR(cpmac_clk)) {
 309                 pr_err("unable to get cpmac clock\n");
 310                 return -1;
 311         }
 312         ar7_device_reset(AR7_RESET_BIT_MDIO);
 313         cpmac_write(bus->priv, CPMAC_MDIO_CONTROL, MDIOC_ENABLE |
 314                     MDIOC_CLKDIV(clk_get_rate(cpmac_clk) / 2200000 - 1));
 315
 316         return 0;
 317 }
 318
 319 static int mii_irqs[PHY_MAX_ADDR] = { PHY_POLL, };
 320
 321 static struct mii_bus *cpmac_mii;
 322
 323 static void cpmac_set_multicast_list(struct net_device *dev)
 324 {
 325         struct netdev_hw_addr *ha;
 326         u8 tmp;
 327         u32 mbp, bit, hash[2] = { 0, };
 328         struct cpmac_priv *priv = netdev_priv(dev);
 329
 330         mbp = cpmac_read(priv->regs, CPMAC_MBP);
 331         if (dev->flags & IFF_PROMISC) {
 332                 cpmac_write(priv->regs, CPMAC_MBP, (mbp & ~MBP_PROMISCCHAN(0)) |
 333                             MBP_RXPROMISC);
 334         } else {
 335                 cpmac_write(priv->regs, CPMAC_MBP, mbp & ~MBP_RXPROMISC);
 336                 if (dev->flags & IFF_ALLMULTI) {
 337                         /* enable all multicast mode */
 338                         cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, 0xffffffff);
 339                         cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, 0xffffffff);
 340                 } else {
 341                         /* cpmac uses some strange mac address hashing
 342                          * (not crc32)
 343                          */
 344                         netdev_for_each_mc_addr(ha, dev) {
 345                                 bit = 0;
 346                                 tmp = ha->addr[0];
 347                                 bit  ^= (tmp >> 2) ^ (tmp << 4);
 348                                 tmp = ha->addr[1];
 349                                 bit  ^= (tmp >> 4) ^ (tmp << 2);
 350                                 tmp = ha->addr[2];
 351                                 bit  ^= (tmp >> 6) ^ tmp;
 352                                 tmp = ha->addr[3];
 353                                 bit  ^= (tmp >> 2) ^ (tmp << 4);
 354                                 tmp = ha->addr[4];
 355                                 bit  ^= (tmp >> 4) ^ (tmp << 2);
 356                                 tmp = ha->addr[5];
 357                                 bit  ^= (tmp >> 6) ^ tmp;
 358                                 bit &= 0x3f;
 359                                 hash[bit / 32] |= 1 << (bit % 32);
 360                         }
 361
 362                         cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, hash[0]);
 363                         cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, hash[1]);
 364                 }
 365         }
 366 }
 367
 368 static struct sk_buff *cpmac_rx_one(struct cpmac_priv *priv,
 369                                     struct cpmac_desc *desc)
 370 {
 371         struct sk_buff *skb, *result = NULL;
 372
 373         if (unlikely(netif_msg_hw(priv)))
 374                 cpmac_dump_desc(priv->dev, desc);
 375         cpmac_write(priv->regs, CPMAC_RX_ACK(0), (u32)desc->mapping);
 376         if (unlikely(!desc->datalen)) {
 377                 if (netif_msg_rx_err(priv) && net_ratelimit())
 378                         netdev_warn(priv->dev, "rx: spurious interrupt\n");
 379
 380                 return NULL;
 381         }
 382
 383         skb = netdev_alloc_skb_ip_align(priv->dev, CPMAC_SKB_SIZE);
 384         if (likely(skb)) {
 385                 skb_put(desc->skb, desc->datalen);
 386                 desc->skb->protocol = eth_type_trans(desc->skb, priv->dev);
 387                 skb_checksum_none_assert(desc->skb);
 388                 priv->dev->stats.rx_packets++;
 389                 priv->dev->stats.rx_bytes += desc->datalen;
 390                 result = desc->skb;
 391                 dma_unmap_single(&priv->dev->dev, desc->data_mapping,
 392                                  CPMAC_SKB_SIZE, DMA_FROM_DEVICE);
 393                 desc->skb = skb;
 394                 desc->data_mapping = dma_map_single(&priv->dev->dev, skb->data,
 395                                                     CPMAC_SKB_SIZE,
 396                                                     DMA_FROM_DEVICE);
 397                 desc->hw_data = (u32)desc->data_mapping;
 398                 if (unlikely(netif_msg_pktdata(priv))) {
 399                         netdev_dbg(priv->dev, "received packet:\n");
 400                         cpmac_dump_skb(priv->dev, result);
 401                 }
 402         } else {
 403                 if (netif_msg_rx_err(priv) && net_ratelimit())
 404                         netdev_warn(priv->dev,
 405                                     "low on skbs, dropping packet\n");
 406
 407                 priv->dev->stats.rx_dropped++;
 408         }
 409
 410         desc->buflen = CPMAC_SKB_SIZE;
 411         desc->dataflags = CPMAC_OWN;
 412
 413         return result;
 414 }
 415
 416 static int cpmac_poll(struct napi_struct *napi, int budget)
 417 {
 418         struct sk_buff *skb;
 419         struct cpmac_desc *desc, *restart;
 420         struct cpmac_priv *priv = container_of(napi, struct cpmac_priv, napi);
 421         int received = 0, processed = 0;
 422
 423         spin_lock(&priv->rx_lock);
 424         if (unlikely(!priv->rx_head)) {
 425                 if (netif_msg_rx_err(priv) && net_ratelimit())
 426                         netdev_warn(priv->dev, "rx: polling, but no queue\n");
 427
 428                 spin_unlock(&priv->rx_lock);
 429                 napi_complete(napi);
 430                 return 0;
 431         }
 432
 433         desc = priv->rx_head;
 434         restart = NULL;
 435         while (((desc->dataflags & CPMAC_OWN) == 0) && (received < budget)) {
 436                 processed++;
 437
 438                 if ((desc->dataflags & CPMAC_EOQ) != 0) {
 439                         /* The last update to eoq->hw_next didn't happen
 440                          * soon enough, and the receiver stopped here.
 441                          * Remember this descriptor so we can restart
 442                          * the receiver after freeing some space.
 443                          */
 444                         if (unlikely(restart)) {
 445                                 if (netif_msg_rx_err(priv))
 446                                         netdev_err(priv->dev, "poll found a"
 447                                                    " duplicate EOQ: %p and %p\n",
 448                                                    restart, desc);
 449                                 goto fatal_error;
 450                         }
 451
 452                         restart = desc->next;
 453                 }
 454
 455                 skb = cpmac_rx_one(priv, desc);
 456                 if (likely(skb)) {
 457                         netif_receive_skb(skb);
 458                         received++;
 459                 }
 460                 desc = desc->next;
 461         }
 462
 463         if (desc != priv->rx_head) {
 464                 /* We freed some buffers, but not the whole ring,
 465                  * add what we did free to the rx list
 466                  */
 467                 desc->prev->hw_next = (u32)0;
 468                 priv->rx_head->prev->hw_next = priv->rx_head->mapping;
 469         }
 470
 471         /* Optimization: If we did not actually process an EOQ (perhaps because
 472          * of quota limits), check to see if the tail of the queue has EOQ set.
 473          * We should immediately restart in that case so that the receiver can
 474          * restart and run in parallel with more packet processing.
 475          * This lets us handle slightly larger bursts before running
 476          * out of ring space (assuming dev->weight < ring_size)
 477          */
 478
 479         if (!restart &&
 480              (priv->rx_head->prev->dataflags & (CPMAC_OWN|CPMAC_EOQ))
 481                     == CPMAC_EOQ &&
 482              (priv->rx_head->dataflags & CPMAC_OWN) != 0) {
 483                 /* reset EOQ so the poll loop (above) doesn't try to
 484                  * restart this when it eventually gets to this descriptor.
 485                  */
 486                 priv->rx_head->prev->dataflags &= ~CPMAC_EOQ;
 487                 restart = priv->rx_head;
 488         }
 489
 490         if (restart) {
 491                 priv->dev->stats.rx_errors++;
 492                 priv->dev->stats.rx_fifo_errors++;
 493                 if (netif_msg_rx_err(priv) && net_ratelimit())
 494                         netdev_warn(priv->dev, "rx dma ring overrun\n");
 495
 496                 if (unlikely((restart->dataflags & CPMAC_OWN) == 0)) {
 497                         if (netif_msg_drv(priv))
 498                                 netdev_err(priv->dev, "cpmac_poll is trying "
 499                                         "to restart rx from a descriptor "
 500                                         "that's not free: %p\n", restart);
 501                         goto fatal_error;
 502                 }
 503
 504                 cpmac_write(priv->regs, CPMAC_RX_PTR(0), restart->mapping);
 505         }
 506
 507         priv->rx_head = desc;
 508         spin_unlock(&priv->rx_lock);
 509         if (unlikely(netif_msg_rx_status(priv)))
 510                 netdev_dbg(priv->dev, "poll processed %d packets\n", received);
 511
 512         if (processed == 0) {
 513                 /* we ran out of packets to read,
 514                  * revert to interrupt-driven mode
 515                  */
 516                 napi_complete(napi);
 517                 cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
 518                 return 0;
 519         }
 520
 521         return 1;
 522
 523 fatal_error:
 524         /* Something went horribly wrong.
 525          * Reset hardware to try to recover rather than wedging.
 526          */
 527         if (netif_msg_drv(priv)) {
 528                 netdev_err(priv->dev, "cpmac_poll is confused. "
 529                            "Resetting hardware\n");
 530                 cpmac_dump_all_desc(priv->dev);
 531                 netdev_dbg(priv->dev, "RX_PTR(0)=0x%08x RX_ACK(0)=0x%08x\n",
 532                            cpmac_read(priv->regs, CPMAC_RX_PTR(0)),
 533                            cpmac_read(priv->regs, CPMAC_RX_ACK(0)));
 534         }
 535
 536         spin_unlock(&priv->rx_lock);
 537         napi_complete(napi);
 538         netif_tx_stop_all_queues(priv->dev);
 539         napi_disable(&priv->napi);
 540
 541         atomic_inc(&priv->reset_pending);
 542         cpmac_hw_stop(priv->dev);
 543         if (!schedule_work(&priv->reset_work))
 544                 atomic_dec(&priv->reset_pending);
 545
 546         return 0;
 547
 548 }
 549
 550 static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
 551 {
 552         int queue, len;
 553         struct cpmac_desc *desc;
 554         struct cpmac_priv *priv = netdev_priv(dev);
 555
 556         if (unlikely(atomic_read(&priv->reset_pending)))
 557                 return NETDEV_TX_BUSY;
 558
 559         if (unlikely(skb_padto(skb, ETH_ZLEN)))
 560                 return NETDEV_TX_OK;
 561
 562         len = max(skb->len, ETH_ZLEN);
 563         queue = skb_get_queue_mapping(skb);
 564         netif_stop_subqueue(dev, queue);
 565
 566         desc = &priv->desc_ring[queue];
 567         if (unlikely(desc->dataflags & CPMAC_OWN)) {
 568                 if (netif_msg_tx_err(priv) && net_ratelimit())
 569                         netdev_warn(dev, "tx dma ring full\n");
 570
 571                 return NETDEV_TX_BUSY;
 572         }
 573
 574         spin_lock(&priv->lock);
 575         spin_unlock(&priv->lock);
 576         desc->dataflags = CPMAC_SOP | CPMAC_EOP | CPMAC_OWN;
 577         desc->skb = skb;
 578         desc->data_mapping = dma_map_single(&dev->dev, skb->data, len,
 579                                             DMA_TO_DEVICE);
 580         desc->hw_data = (u32)desc->data_mapping;
 581         desc->datalen = len;
 582         desc->buflen = len;
 583         if (unlikely(netif_msg_tx_queued(priv)))
 584                 netdev_dbg(dev, "sending 0x%p, len=%d\n", skb, skb->len);
 585         if (unlikely(netif_msg_hw(priv)))
 586                 cpmac_dump_desc(dev, desc);
 587         if (unlikely(netif_msg_pktdata(priv)))
 588                 cpmac_dump_skb(dev, skb);
 589         cpmac_write(priv->regs, CPMAC_TX_PTR(queue), (u32)desc->mapping);
 590
 591         return NETDEV_TX_OK;
 592 }
 593
 594 static void cpmac_end_xmit(struct net_device *dev, int queue)
 595 {
 596         struct cpmac_desc *desc;
 597         struct cpmac_priv *priv = netdev_priv(dev);
 598
 599         desc = &priv->desc_ring[queue];
 600         cpmac_write(priv->regs, CPMAC_TX_ACK(queue), (u32)desc->mapping);
 601         if (likely(desc->skb)) {
 602                 spin_lock(&priv->lock);
 603                 dev->stats.tx_packets++;
 604                 dev->stats.tx_bytes += desc->skb->len;
 605                 spin_unlock(&priv->lock);
 606                 dma_unmap_single(&dev->dev, desc->data_mapping, desc->skb->len,
 607                                  DMA_TO_DEVICE);
 608
 609                 if (unlikely(netif_msg_tx_done(priv)))
 610                         netdev_dbg(dev, "sent 0x%p, len=%d\n",
 611                                    desc->skb, desc->skb->len);
 612
 613                 dev_kfree_skb_irq(desc->skb);
 614                 desc->skb = NULL;
 615                 if (__netif_subqueue_stopped(dev, queue))
 616                         netif_wake_subqueue(dev, queue);
 617         } else {
 618                 if (netif_msg_tx_err(priv) && net_ratelimit())
 619                         netdev_warn(dev, "end_xmit: spurious interrupt\n");
 620                 if (__netif_subqueue_stopped(dev, queue))
 621                         netif_wake_subqueue(dev, queue);
 622         }
 623 }
 624
 625 static void cpmac_hw_stop(struct net_device *dev)
 626 {
 627         int i;
 628         struct cpmac_priv *priv = netdev_priv(dev);
 629         struct plat_cpmac_data *pdata = dev_get_platdata(&priv->pdev->dev);
 630
 631         ar7_device_reset(pdata->reset_bit);
 632         cpmac_write(priv->regs, CPMAC_RX_CONTROL,
 633                     cpmac_read(priv->regs, CPMAC_RX_CONTROL) & ~1);
 634         cpmac_write(priv->regs, CPMAC_TX_CONTROL,
 635                     cpmac_read(priv->regs, CPMAC_TX_CONTROL) & ~1);
 636         for (i = 0; i < 8; i++) {
 637                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
 638                 cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
 639         }
 640         cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
 641         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
 642         cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
 643         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 644         cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
 645                     cpmac_read(priv->regs, CPMAC_MAC_CONTROL) & ~MAC_MII);
 646 }
 647
 648 static void cpmac_hw_start(struct net_device *dev)
 649 {
 650         int i;
 651         struct cpmac_priv *priv = netdev_priv(dev);
 652         struct plat_cpmac_data *pdata = dev_get_platdata(&priv->pdev->dev);
 653
 654         ar7_device_reset(pdata->reset_bit);
 655         for (i = 0; i < 8; i++) {
 656                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
 657                 cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
 658         }
 659         cpmac_write(priv->regs, CPMAC_RX_PTR(0), priv->rx_head->mapping);
 660
 661         cpmac_write(priv->regs, CPMAC_MBP, MBP_RXSHORT | MBP_RXBCAST |
 662                     MBP_RXMCAST);
 663         cpmac_write(priv->regs, CPMAC_BUFFER_OFFSET, 0);
 664         for (i = 0; i < 8; i++)
 665                 cpmac_write(priv->regs, CPMAC_MAC_ADDR_LO(i), dev->dev_addr[5]);
 666         cpmac_write(priv->regs, CPMAC_MAC_ADDR_MID, dev->dev_addr[4]);
 667         cpmac_write(priv->regs, CPMAC_MAC_ADDR_HI, dev->dev_addr[0] |
 668                     (dev->dev_addr[1] << 8) | (dev->dev_addr[2] << 16) |
 669                     (dev->dev_addr[3] << 24));
 670         cpmac_write(priv->regs, CPMAC_MAX_LENGTH, CPMAC_SKB_SIZE);
 671         cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
 672         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
 673         cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
 674         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 675         cpmac_write(priv->regs, CPMAC_UNICAST_ENABLE, 1);
 676         cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
 677         cpmac_write(priv->regs, CPMAC_TX_INT_ENABLE, 0xff);
 678         cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
 679
 680         cpmac_write(priv->regs, CPMAC_RX_CONTROL,
 681                     cpmac_read(priv->regs, CPMAC_RX_CONTROL) | 1);
 682         cpmac_write(priv->regs, CPMAC_TX_CONTROL,
 683                     cpmac_read(priv->regs, CPMAC_TX_CONTROL) | 1);
 684         cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
 685                     cpmac_read(priv->regs, CPMAC_MAC_CONTROL) | MAC_MII |
 686                     MAC_FDX);
 687 }
 688
 689 static void cpmac_clear_rx(struct net_device *dev)
 690 {
 691         struct cpmac_priv *priv = netdev_priv(dev);
 692         struct cpmac_desc *desc;
 693         int i;
 694
 695         if (unlikely(!priv->rx_head))
 696                 return;
 697         desc = priv->rx_head;
 698         for (i = 0; i < priv->ring_size; i++) {
 699                 if ((desc->dataflags & CPMAC_OWN) == 0) {
 700                         if (netif_msg_rx_err(priv) && net_ratelimit())
 701                                 netdev_warn(dev, "packet dropped\n");
 702                         if (unlikely(netif_msg_hw(priv)))
 703                                 cpmac_dump_desc(dev, desc);
 704                         desc->dataflags = CPMAC_OWN;
 705                         dev->stats.rx_dropped++;
 706                 }
 707                 desc->hw_next = desc->next->mapping;
 708                 desc = desc->next;
 709         }
 710         priv->rx_head->prev->hw_next = 0;
 711 }
 712
 713 static void cpmac_clear_tx(struct net_device *dev)
 714 {
 715         struct cpmac_priv *priv = netdev_priv(dev);
 716         int i;
 717
 718         if (unlikely(!priv->desc_ring))
 719                 return;
 720         for (i = 0; i < CPMAC_QUEUES; i++) {
 721                 priv->desc_ring[i].dataflags = 0;
 722                 if (priv->desc_ring[i].skb) {
 723                         dev_kfree_skb_any(priv->desc_ring[i].skb);
 724                         priv->desc_ring[i].skb = NULL;
 725                 }
 726         }
 727 }
 728
 729 static void cpmac_hw_error(struct work_struct *work)
 730 {
 731         struct cpmac_priv *priv =
 732                 container_of(work, struct cpmac_priv, reset_work);
 733
 734         spin_lock(&priv->rx_lock);
 735         cpmac_clear_rx(priv->dev);
 736         spin_unlock(&priv->rx_lock);
 737         cpmac_clear_tx(priv->dev);
 738         cpmac_hw_start(priv->dev);
 739         barrier();
 740         atomic_dec(&priv->reset_pending);
 741
 742         netif_tx_wake_all_queues(priv->dev);
 743         cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
 744 }
 745
 746 static void cpmac_check_status(struct net_device *dev)
 747 {
 748         struct cpmac_priv *priv = netdev_priv(dev);
 749
 750         u32 macstatus = cpmac_read(priv->regs, CPMAC_MAC_STATUS);
 751         int rx_channel = (macstatus >> 8) & 7;
 752         int rx_code = (macstatus >> 12) & 15;
 753         int tx_channel = (macstatus >> 16) & 7;
 754         int tx_code = (macstatus >> 20) & 15;
 755
 756         if (rx_code || tx_code) {
 757                 if (netif_msg_drv(priv) && net_ratelimit()) {
 758                         /* Can't find any documentation on what these
 759                          * error codes actually are. So just log them and hope..
 760                          */
 761                         if (rx_code)
 762                                 netdev_warn(dev, "host error %d on rx "
 763                                         "channel %d (macstatus %08x), resetting\n",
 764                                         rx_code, rx_channel, macstatus);
 765                         if (tx_code)
 766                                 netdev_warn(dev, "host error %d on tx "
 767                                         "channel %d (macstatus %08x), resetting\n",
 768                                         tx_code, tx_channel, macstatus);
 769                 }
 770
 771                 netif_tx_stop_all_queues(dev);
 772                 cpmac_hw_stop(dev);
 773                 if (schedule_work(&priv->reset_work))
 774                         atomic_inc(&priv->reset_pending);
 775                 if (unlikely(netif_msg_hw(priv)))
 776                         cpmac_dump_regs(dev);
 777         }
 778         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 779 }
 780
 781 static irqreturn_t cpmac_irq(int irq, void *dev_id)
 782 {
 783         struct net_device *dev = dev_id;
 784         struct cpmac_priv *priv;
 785         int queue;
 786         u32 status;
 787
 788         priv = netdev_priv(dev);
 789
 790         status = cpmac_read(priv->regs, CPMAC_MAC_INT_VECTOR);
 791
 792         if (unlikely(netif_msg_intr(priv)))
 793                 netdev_dbg(dev, "interrupt status: 0x%08x\n", status);
 794
 795         if (status & MAC_INT_TX)
 796                 cpmac_end_xmit(dev, (status & 7));
 797
 798         if (status & MAC_INT_RX) {
 799                 queue = (status >> 8) & 7;
 800                 if (napi_schedule_prep(&priv->napi)) {
 801                         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 1 << queue);
 802                         __napi_schedule(&priv->napi);
 803                 }
 804         }
 805
 806         cpmac_write(priv->regs, CPMAC_MAC_EOI_VECTOR, 0);
 807
 808         if (unlikely(status & (MAC_INT_HOST | MAC_INT_STATUS)))
 809                 cpmac_check_status(dev);
 810
 811         return IRQ_HANDLED;
 812 }
 813
 814 static void cpmac_tx_timeout(struct net_device *dev)
 815 {
 816         struct cpmac_priv *priv = netdev_priv(dev);
 817
 818         spin_lock(&priv->lock);
 819         dev->stats.tx_errors++;
 820         spin_unlock(&priv->lock);
 821         if (netif_msg_tx_err(priv) && net_ratelimit())
 822                 netdev_warn(dev, "transmit timeout\n");
 823
 824         atomic_inc(&priv->reset_pending);
 825         barrier();
 826         cpmac_clear_tx(dev);
 827         barrier();
 828         atomic_dec(&priv->reset_pending);
 829
 830         netif_tx_wake_all_queues(priv->dev);
 831 }
 832
 833 static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 834 {
 835         struct cpmac_priv *priv = netdev_priv(dev);
 836
 837         if (!(netif_running(dev)))
 838                 return -EINVAL;
 839         if (!priv->phy)
 840                 return -EINVAL;
 841
 842         return phy_mii_ioctl(priv->phy, ifr, cmd);
 843 }
 844
 845 static int cpmac_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 846 {
 847         struct cpmac_priv *priv = netdev_priv(dev);
 848
 849         if (priv->phy)
 850                 return phy_ethtool_gset(priv->phy, cmd);
 851
 852         return -EINVAL;
 853 }
 854
 855 static int cpmac_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 856 {
 857         struct cpmac_priv *priv = netdev_priv(dev);
 858
 859         if (!capable(CAP_NET_ADMIN))
 860                 return -EPERM;
 861
 862         if (priv->phy)
 863                 return phy_ethtool_sset(priv->phy, cmd);
 864
 865         return -EINVAL;
 866 }
 867
 868 static void cpmac_get_ringparam(struct net_device *dev,
 869                                                 struct ethtool_ringparam *ring)
 870 {
 871         struct cpmac_priv *priv = netdev_priv(dev);
 872
 873         ring->rx_max_pending = 1024;
 874         ring->rx_mini_max_pending = 1;
 875         ring->rx_jumbo_max_pending = 1;
 876         ring->tx_max_pending = 1;
 877
 878         ring->rx_pending = priv->ring_size;
 879         ring->rx_mini_pending = 1;
 880         ring->rx_jumbo_pending = 1;
 881         ring->tx_pending = 1;
 882 }
 883
 884 static int cpmac_set_ringparam(struct net_device *dev,
 885                                                 struct ethtool_ringparam *ring)
 886 {
 887         struct cpmac_priv *priv = netdev_priv(dev);
 888
 889         if (netif_running(dev))
 890                 return -EBUSY;
 891         priv->ring_size = ring->rx_pending;
 892
 893         return 0;
 894 }
 895
 896 static void cpmac_get_drvinfo(struct net_device *dev,
 897                               struct ethtool_drvinfo *info)
 898 {
 899         strlcpy(info->driver, "cpmac", sizeof(info->driver));
 900         strlcpy(info->version, CPMAC_VERSION, sizeof(info->version));
 901         snprintf(info->bus_info, sizeof(info->bus_info), "%s", "cpmac");
 902 }
 903
 904 static const struct ethtool_ops cpmac_ethtool_ops = {
 905         .get_settings = cpmac_get_settings,
 906         .set_settings = cpmac_set_settings,
 907         .get_drvinfo = cpmac_get_drvinfo,
 908         .get_link = ethtool_op_get_link,
 909         .get_ringparam = cpmac_get_ringparam,
 910         .set_ringparam = cpmac_set_ringparam,
 911 };
 912
 913 static void cpmac_adjust_link(struct net_device *dev)
 914 {
 915         struct cpmac_priv *priv = netdev_priv(dev);
 916         int new_state = 0;
 917
 918         spin_lock(&priv->lock);
 919         if (priv->phy->link) {
 920                 netif_tx_start_all_queues(dev);
 921                 if (priv->phy->duplex != priv->oldduplex) {
 922                         new_state = 1;
 923                         priv->oldduplex = priv->phy->duplex;
 924                 }
 925
 926                 if (priv->phy->speed != priv->oldspeed) {
 927                         new_state = 1;
 928                         priv->oldspeed = priv->phy->speed;
 929                 }
 930
 931                 if (!priv->oldlink) {
 932                         new_state = 1;
 933                         priv->oldlink = 1;
 934                 }
 935         } else if (priv->oldlink) {
 936                 new_state = 1;
 937                 priv->oldlink = 0;
 938                 priv->oldspeed = 0;
 939                 priv->oldduplex = -1;
 940         }
 941
 942         if (new_state && netif_msg_link(priv) && net_ratelimit())
 943                 phy_print_status(priv->phy);
 944
 945         spin_unlock(&priv->lock);
 946 }
 947
 948 static int cpmac_open(struct net_device *dev)
 949 {
 950         int i, size, res;
 951         struct cpmac_priv *priv = netdev_priv(dev);
 952         struct resource *mem;
 953         struct cpmac_desc *desc;
 954         struct sk_buff *skb;
 955
 956         mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
 957         if (!request_mem_region(mem->start, resource_size(mem), dev->name)) {
 958                 if (netif_msg_drv(priv))
 959                         netdev_err(dev, "failed to request registers\n");
 960
 961                 res = -ENXIO;
 962                 goto fail_reserve;
 963         }
 964
 965         priv->regs = ioremap(mem->start, resource_size(mem));
 966         if (!priv->regs) {
 967                 if (netif_msg_drv(priv))
 968                         netdev_err(dev, "failed to remap registers\n");
 969
 970                 res = -ENXIO;
 971                 goto fail_remap;
 972         }
 973
 974         size = priv->ring_size + CPMAC_QUEUES;
 975         priv->desc_ring = dma_alloc_coherent(&dev->dev,
 976                                              sizeof(struct cpmac_desc) * size,
 977                                              &priv->dma_ring,
 978                                              GFP_KERNEL);
 979         if (!priv->desc_ring) {
 980                 res = -ENOMEM;
 981                 goto fail_alloc;
 982         }
 983
 984         for (i = 0; i < size; i++)
 985                 priv->desc_ring[i].mapping = priv->dma_ring + sizeof(*desc) * i;
 986
 987         priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
 988         for (i = 0, desc = priv->rx_head; i < priv->ring_size; i++, desc++) {
 989                 skb = netdev_alloc_skb_ip_align(dev, CPMAC_SKB_SIZE);
 990                 if (unlikely(!skb)) {
 991                         res = -ENOMEM;
 992                         goto fail_desc;
 993                 }
 994                 desc->skb = skb;
 995                 desc->data_mapping = dma_map_single(&dev->dev, skb->data,
 996                                                     CPMAC_SKB_SIZE,
 997                                                     DMA_FROM_DEVICE);
 998                 desc->hw_data = (u32)desc->data_mapping;
 999                 desc->buflen = CPMAC_SKB_SIZE;
1000                 desc->dataflags = CPMAC_OWN;
1001                 desc->next = &priv->rx_head[(i + 1) % priv->ring_size];
1002                 desc->next->prev = desc;
1003                 desc->hw_next = (u32)desc->next->mapping;
1004         }
1005
1006         priv->rx_head->prev->hw_next = (u32)0;
1007
1008         res = request_irq(dev->irq, cpmac_irq, IRQF_SHARED, dev->name, dev);
1009         if (res) {
1010                 if (netif_msg_drv(priv))
1011                         netdev_err(dev, "failed to obtain irq\n");
1012
1013                 goto fail_irq;
1014         }
1015
1016         atomic_set(&priv->reset_pending, 0);
1017         INIT_WORK(&priv->reset_work, cpmac_hw_error);
1018         cpmac_hw_start(dev);
1019
1020         napi_enable(&priv->napi);
1021         priv->phy->state = PHY_CHANGELINK;
1022         phy_start(priv->phy);
1023
1024         return 0;
1025
1026 fail_irq:
1027 fail_desc:
1028         for (i = 0; i < priv->ring_size; i++) {
1029                 if (priv->rx_head[i].skb) {
1030                         dma_unmap_single(&dev->dev,
1031                                          priv->rx_head[i].data_mapping,
1032                                          CPMAC_SKB_SIZE,
1033                                          DMA_FROM_DEVICE);
1034                         kfree_skb(priv->rx_head[i].skb);
1035                 }
1036         }
1037 fail_alloc:
1038         kfree(priv->desc_ring);
1039         iounmap(priv->regs);
1040
1041 fail_remap:
1042         release_mem_region(mem->start, resource_size(mem));
1043
1044 fail_reserve:
1045         return res;
1046 }
1047
1048 static int cpmac_stop(struct net_device *dev)
1049 {
1050         int i;
1051         struct cpmac_priv *priv = netdev_priv(dev);
1052         struct resource *mem;
1053
1054         netif_tx_stop_all_queues(dev);
1055
1056         cancel_work_sync(&priv->reset_work);
1057         napi_disable(&priv->napi);
1058         phy_stop(priv->phy);
1059
1060         cpmac_hw_stop(dev);
1061
1062         for (i = 0; i < 8; i++)
1063                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
1064         cpmac_write(priv->regs, CPMAC_RX_PTR(0), 0);
1065         cpmac_write(priv->regs, CPMAC_MBP, 0);
1066
1067         free_irq(dev->irq, dev);
1068         iounmap(priv->regs);
1069         mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
1070         release_mem_region(mem->start, resource_size(mem));
1071         priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
1072         for (i = 0; i < priv->ring_size; i++) {
1073                 if (priv->rx_head[i].skb) {
1074                         dma_unmap_single(&dev->dev,
1075                                          priv->rx_head[i].data_mapping,
1076                                          CPMAC_SKB_SIZE,
1077                                          DMA_FROM_DEVICE);
1078                         kfree_skb(priv->rx_head[i].skb);
1079                 }
1080         }
1081
1082         dma_free_coherent(&dev->dev, sizeof(struct cpmac_desc) *
1083                           (CPMAC_QUEUES + priv->ring_size),
1084                           priv->desc_ring, priv->dma_ring);
1085
1086         return 0;
1087 }
1088
1089 static const struct net_device_ops cpmac_netdev_ops = {
1090         .ndo_open               = cpmac_open,
1091         .ndo_stop               = cpmac_stop,
1092         .ndo_start_xmit         = cpmac_start_xmit,
1093         .ndo_tx_timeout         = cpmac_tx_timeout,
1094         .ndo_set_rx_mode        = cpmac_set_multicast_list,
1095         .ndo_do_ioctl           = cpmac_ioctl,
1096         .ndo_change_mtu         = eth_change_mtu,
1097         .ndo_validate_addr      = eth_validate_addr,
1098         .ndo_set_mac_address    = eth_mac_addr,
1099 };
1100
1101 static int external_switch;
1102
1103 static int cpmac_probe(struct platform_device *pdev)
1104 {
1105         int rc, phy_id;
1106         char mdio_bus_id[MII_BUS_ID_SIZE];
1107         struct resource *mem;
1108         struct cpmac_priv *priv;
1109         struct net_device *dev;
1110         struct plat_cpmac_data *pdata;
1111
1112         pdata = dev_get_platdata(&pdev->dev);
1113
1114         if (external_switch || dumb_switch) {
1115                 strncpy(mdio_bus_id, "fixed-0", MII_BUS_ID_SIZE); /* fixed phys bus */
1116                 phy_id = pdev->id;
1117         } else {
1118                 for (phy_id = 0; phy_id < PHY_MAX_ADDR; phy_id++) {
1119                         if (!(pdata->phy_mask & (1 << phy_id)))
1120                                 continue;
1121                         if (!cpmac_mii->phy_map[phy_id])
1122                                 continue;
1123                         strncpy(mdio_bus_id, cpmac_mii->id, MII_BUS_ID_SIZE);
1124                         break;
1125                 }
1126         }
1127
1128         if (phy_id == PHY_MAX_ADDR) {
1129                 dev_err(&pdev->dev, "no PHY present, falling back "
1130                         "to switch on MDIO bus 0\n");
1131                 strncpy(mdio_bus_id, "fixed-0", MII_BUS_ID_SIZE); /* fixed phys bus */
1132                 phy_id = pdev->id;
1133         }
1134         mdio_bus_id[sizeof(mdio_bus_id) - 1] = '\0';
1135
1136         dev = alloc_etherdev_mq(sizeof(*priv), CPMAC_QUEUES);
1137         if (!dev)
1138                 return -ENOMEM;
1139
1140         platform_set_drvdata(pdev, dev);
1141         priv = netdev_priv(dev);
1142
1143         priv->pdev = pdev;
1144         mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
1145         if (!mem) {
1146                 rc = -ENODEV;
1147                 goto out;
1148         }
1149
1150         dev->irq = platform_get_irq_byname(pdev, "irq");
1151
1152         dev->netdev_ops = &cpmac_netdev_ops;
1153         dev->ethtool_ops = &cpmac_ethtool_ops;
1154
1155         netif_napi_add(dev, &priv->napi, cpmac_poll, 64);
1156
1157         spin_lock_init(&priv->lock);
1158         spin_lock_init(&priv->rx_lock);
1159         priv->dev = dev;
1160         priv->ring_size = 64;
1161         priv->msg_enable = netif_msg_init(debug_level, 0xff);
1162         memcpy(dev->dev_addr, pdata->dev_addr, sizeof(pdata->dev_addr));
1163
1164         snprintf(priv->phy_name, MII_BUS_ID_SIZE, PHY_ID_FMT,
1165                                                 mdio_bus_id, phy_id);
1166
1167         priv->phy = phy_connect(dev, priv->phy_name, cpmac_adjust_link,
1168                                 PHY_INTERFACE_MODE_MII);
1169
1170         if (IS_ERR(priv->phy)) {
1171                 if (netif_msg_drv(priv))
1172                         dev_err(&pdev->dev, "Could not attach to PHY\n");
1173
1174                 rc = PTR_ERR(priv->phy);
1175                 goto out;
1176         }
1177
1178         rc = register_netdev(dev);
1179         if (rc) {
1180                 dev_err(&pdev->dev, "Could not register net device\n");
1181                 goto fail;
1182         }
1183
1184         if (netif_msg_probe(priv)) {
1185                 dev_info(&pdev->dev, "regs: %p, irq: %d, phy: %s, "
1186                          "mac: %pM\n", (void *)mem->start, dev->irq,
1187                          priv->phy_name, dev->dev_addr);
1188         }
1189
1190         return 0;
1191
1192 fail:
1193         free_netdev(dev);
1194 out:
1195         return rc;
1196 }
1197
1198 static int cpmac_remove(struct platform_device *pdev)
1199 {
1200         struct net_device *dev = platform_get_drvdata(pdev);
1201
1202         unregister_netdev(dev);
1203         free_netdev(dev);
1204
1205         return 0;
1206 }
1207
1208 static struct platform_driver cpmac_driver = {
1209         .driver = {
1210                 .name   = "cpmac",
1211         },
1212         .probe  = cpmac_probe,
1213         .remove = cpmac_remove,
1214 };
1215
1216 int cpmac_init(void)
1217 {
1218         u32 mask;
1219         int i, res;
1220
1221         cpmac_mii = mdiobus_alloc();
1222         if (cpmac_mii == NULL)
1223                 return -ENOMEM;
1224
1225         cpmac_mii->name = "cpmac-mii";
1226         cpmac_mii->read = cpmac_mdio_read;
1227         cpmac_mii->write = cpmac_mdio_write;
1228         cpmac_mii->reset = cpmac_mdio_reset;
1229         cpmac_mii->irq = mii_irqs;
1230
1231         cpmac_mii->priv = ioremap(AR7_REGS_MDIO, 256);
1232
1233         if (!cpmac_mii->priv) {
1234                 pr_err("Can't ioremap mdio registers\n");
1235                 res = -ENXIO;
1236                 goto fail_alloc;
1237         }
1238
1239 #warning FIXME: unhardcode gpio&reset bits
1240         ar7_gpio_disable(26);
1241         ar7_gpio_disable(27);
1242         ar7_device_reset(AR7_RESET_BIT_CPMAC_LO);
1243         ar7_device_reset(AR7_RESET_BIT_CPMAC_HI);
1244         ar7_device_reset(AR7_RESET_BIT_EPHY);
1245
1246         cpmac_mii->reset(cpmac_mii);
1247
1248         for (i = 0; i < 300; i++) {
1249                 mask = cpmac_read(cpmac_mii->priv, CPMAC_MDIO_ALIVE);
1250                 if (mask)
1251                         break;
1252                 else
1253                         msleep(10);
1254         }
1255
1256         mask &= 0x7fffffff;
1257         if (mask & (mask - 1)) {
1258                 external_switch = 1;
1259                 mask = 0;
1260         }
1261
1262         cpmac_mii->phy_mask = ~(mask | 0x80000000);
1263         snprintf(cpmac_mii->id, MII_BUS_ID_SIZE, "cpmac-1");
1264
1265         res = mdiobus_register(cpmac_mii);
1266         if (res)
1267                 goto fail_mii;
1268
1269         res = platform_driver_register(&cpmac_driver);
1270         if (res)
1271                 goto fail_cpmac;
1272
1273         return 0;
1274
1275 fail_cpmac:
1276         mdiobus_unregister(cpmac_mii);
1277
1278 fail_mii:
1279         iounmap(cpmac_mii->priv);
1280
1281 fail_alloc:
1282         mdiobus_free(cpmac_mii);
1283
1284         return res;
1285 }
1286
1287 void cpmac_exit(void)
1288 {
1289         platform_driver_unregister(&cpmac_driver);
1290         mdiobus_unregister(cpmac_mii);
1291         iounmap(cpmac_mii->priv);
1292         mdiobus_free(cpmac_mii);
1293 }
1294
1295 module_init(cpmac_init);
1296 module_exit(cpmac_exit);