err.no Git - linux-2.6/blob - drivers/net/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/init.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 #include <linux/version.h>
  30
  31 #include <linux/netdevice.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 <asm/gpio.h>
  41 #include <asm/atomic.h>
  42
  43 MODULE_AUTHOR("Eugene Konev <ejka@imfi.kspu.ru>");
  44 MODULE_DESCRIPTION("TI AR7 ethernet driver (CPMAC)");
  45 MODULE_LICENSE("GPL");
  46 MODULE_ALIAS("platform:cpmac");
  47
  48 static int debug_level = 8;
  49 static int dumb_switch;
  50
  51 /* Next 2 are only used in cpmac_probe, so it's pointless to change them */
  52 module_param(debug_level, int, 0444);
  53 module_param(dumb_switch, int, 0444);
  54
  55 MODULE_PARM_DESC(debug_level, "Number of NETIF_MSG bits to enable");
  56 MODULE_PARM_DESC(dumb_switch, "Assume switch is not connected to MDIO bus");
  57
  58 #define CPMAC_VERSION "0.5.0"
  59 /* frame size + 802.1q tag */
  60 #define CPMAC_SKB_SIZE          (ETH_FRAME_LEN + 4)
  61 #define CPMAC_QUEUES    8
  62
  63 /* Ethernet registers */
  64 #define CPMAC_TX_CONTROL                0x0004
  65 #define CPMAC_TX_TEARDOWN               0x0008
  66 #define CPMAC_RX_CONTROL                0x0014
  67 #define CPMAC_RX_TEARDOWN               0x0018
  68 #define CPMAC_MBP                       0x0100
  69 # define MBP_RXPASSCRC                  0x40000000
  70 # define MBP_RXQOS                      0x20000000
  71 # define MBP_RXNOCHAIN                  0x10000000
  72 # define MBP_RXCMF                      0x01000000
  73 # define MBP_RXSHORT                    0x00800000
  74 # define MBP_RXCEF                      0x00400000
  75 # define MBP_RXPROMISC                  0x00200000
  76 # define MBP_PROMISCCHAN(channel)       (((channel) & 0x7) << 16)
  77 # define MBP_RXBCAST                    0x00002000
  78 # define MBP_BCASTCHAN(channel)         (((channel) & 0x7) << 8)
  79 # define MBP_RXMCAST                    0x00000020
  80 # define MBP_MCASTCHAN(channel)         ((channel) & 0x7)
  81 #define CPMAC_UNICAST_ENABLE            0x0104
  82 #define CPMAC_UNICAST_CLEAR             0x0108
  83 #define CPMAC_MAX_LENGTH                0x010c
  84 #define CPMAC_BUFFER_OFFSET             0x0110
  85 #define CPMAC_MAC_CONTROL               0x0160
  86 # define MAC_TXPTYPE                    0x00000200
  87 # define MAC_TXPACE                     0x00000040
  88 # define MAC_MII                        0x00000020
  89 # define MAC_TXFLOW                     0x00000010
  90 # define MAC_RXFLOW                     0x00000008
  91 # define MAC_MTEST                      0x00000004
  92 # define MAC_LOOPBACK                   0x00000002
  93 # define MAC_FDX                        0x00000001
  94 #define CPMAC_MAC_STATUS                0x0164
  95 # define MAC_STATUS_QOS                 0x00000004
  96 # define MAC_STATUS_RXFLOW              0x00000002
  97 # define MAC_STATUS_TXFLOW              0x00000001
  98 #define CPMAC_TX_INT_ENABLE             0x0178
  99 #define CPMAC_TX_INT_CLEAR              0x017c
 100 #define CPMAC_MAC_INT_VECTOR            0x0180
 101 # define MAC_INT_STATUS                 0x00080000
 102 # define MAC_INT_HOST                   0x00040000
 103 # define MAC_INT_RX                     0x00020000
 104 # define MAC_INT_TX                     0x00010000
 105 #define CPMAC_MAC_EOI_VECTOR            0x0184
 106 #define CPMAC_RX_INT_ENABLE             0x0198
 107 #define CPMAC_RX_INT_CLEAR              0x019c
 108 #define CPMAC_MAC_INT_ENABLE            0x01a8
 109 #define CPMAC_MAC_INT_CLEAR             0x01ac
 110 #define CPMAC_MAC_ADDR_LO(channel)      (0x01b0 + (channel) * 4)
 111 #define CPMAC_MAC_ADDR_MID              0x01d0
 112 #define CPMAC_MAC_ADDR_HI               0x01d4
 113 #define CPMAC_MAC_HASH_LO               0x01d8
 114 #define CPMAC_MAC_HASH_HI               0x01dc
 115 #define CPMAC_TX_PTR(channel)           (0x0600 + (channel) * 4)
 116 #define CPMAC_RX_PTR(channel)           (0x0620 + (channel) * 4)
 117 #define CPMAC_TX_ACK(channel)           (0x0640 + (channel) * 4)
 118 #define CPMAC_RX_ACK(channel)           (0x0660 + (channel) * 4)
 119 #define CPMAC_REG_END                   0x0680
 120 /*
 121  * Rx/Tx statistics
 122  * TODO: use some of them to fill stats in cpmac_stats()
 123  */
 124 #define CPMAC_STATS_RX_GOOD             0x0200
 125 #define CPMAC_STATS_RX_BCAST            0x0204
 126 #define CPMAC_STATS_RX_MCAST            0x0208
 127 #define CPMAC_STATS_RX_PAUSE            0x020c
 128 #define CPMAC_STATS_RX_CRC              0x0210
 129 #define CPMAC_STATS_RX_ALIGN            0x0214
 130 #define CPMAC_STATS_RX_OVER             0x0218
 131 #define CPMAC_STATS_RX_JABBER           0x021c
 132 #define CPMAC_STATS_RX_UNDER            0x0220
 133 #define CPMAC_STATS_RX_FRAG             0x0224
 134 #define CPMAC_STATS_RX_FILTER           0x0228
 135 #define CPMAC_STATS_RX_QOSFILTER        0x022c
 136 #define CPMAC_STATS_RX_OCTETS           0x0230
 137
 138 #define CPMAC_STATS_TX_GOOD             0x0234
 139 #define CPMAC_STATS_TX_BCAST            0x0238
 140 #define CPMAC_STATS_TX_MCAST            0x023c
 141 #define CPMAC_STATS_TX_PAUSE            0x0240
 142 #define CPMAC_STATS_TX_DEFER            0x0244
 143 #define CPMAC_STATS_TX_COLLISION        0x0248
 144 #define CPMAC_STATS_TX_SINGLECOLL       0x024c
 145 #define CPMAC_STATS_TX_MULTICOLL        0x0250
 146 #define CPMAC_STATS_TX_EXCESSCOLL       0x0254
 147 #define CPMAC_STATS_TX_LATECOLL         0x0258
 148 #define CPMAC_STATS_TX_UNDERRUN         0x025c
 149 #define CPMAC_STATS_TX_CARRIERSENSE     0x0260
 150 #define CPMAC_STATS_TX_OCTETS           0x0264
 151
 152 #define cpmac_read(base, reg)           (readl((void __iomem *)(base) + (reg)))
 153 #define cpmac_write(base, reg, val)     (writel(val, (void __iomem *)(base) + \
 154                                                 (reg)))
 155
 156 /* MDIO bus */
 157 #define CPMAC_MDIO_VERSION              0x0000
 158 #define CPMAC_MDIO_CONTROL              0x0004
 159 # define MDIOC_IDLE                     0x80000000
 160 # define MDIOC_ENABLE                   0x40000000
 161 # define MDIOC_PREAMBLE                 0x00100000
 162 # define MDIOC_FAULT                    0x00080000
 163 # define MDIOC_FAULTDETECT              0x00040000
 164 # define MDIOC_INTTEST                  0x00020000
 165 # define MDIOC_CLKDIV(div)              ((div) & 0xff)
 166 #define CPMAC_MDIO_ALIVE                0x0008
 167 #define CPMAC_MDIO_LINK                 0x000c
 168 #define CPMAC_MDIO_ACCESS(channel)      (0x0080 + (channel) * 8)
 169 # define MDIO_BUSY                      0x80000000
 170 # define MDIO_WRITE                     0x40000000
 171 # define MDIO_REG(reg)                  (((reg) & 0x1f) << 21)
 172 # define MDIO_PHY(phy)                  (((phy) & 0x1f) << 16)
 173 # define MDIO_DATA(data)                ((data) & 0xffff)
 174 #define CPMAC_MDIO_PHYSEL(channel)      (0x0084 + (channel) * 8)
 175 # define PHYSEL_LINKSEL                 0x00000040
 176 # define PHYSEL_LINKINT                 0x00000020
 177
 178 struct cpmac_desc {
 179         u32 hw_next;
 180         u32 hw_data;
 181         u16 buflen;
 182         u16 bufflags;
 183         u16 datalen;
 184         u16 dataflags;
 185 #define CPMAC_SOP                       0x8000
 186 #define CPMAC_EOP                       0x4000
 187 #define CPMAC_OWN                       0x2000
 188 #define CPMAC_EOQ                       0x1000
 189         struct sk_buff *skb;
 190         struct cpmac_desc *next;
 191         struct cpmac_desc *prev;
 192         dma_addr_t mapping;
 193         dma_addr_t data_mapping;
 194 };
 195
 196 struct cpmac_priv {
 197         spinlock_t lock;
 198         spinlock_t rx_lock;
 199         struct cpmac_desc *rx_head;
 200         int ring_size;
 201         struct cpmac_desc *desc_ring;
 202         dma_addr_t dma_ring;
 203         void __iomem *regs;
 204         struct mii_bus *mii_bus;
 205         struct phy_device *phy;
 206         char phy_name[BUS_ID_SIZE];
 207         int oldlink, oldspeed, oldduplex;
 208         u32 msg_enable;
 209         struct net_device *dev;
 210         struct work_struct reset_work;
 211         struct platform_device *pdev;
 212         struct napi_struct napi;
 213         atomic_t reset_pending;
 214 };
 215
 216 static irqreturn_t cpmac_irq(int, void *);
 217 static void cpmac_hw_start(struct net_device *dev);
 218 static void cpmac_hw_stop(struct net_device *dev);
 219 static int cpmac_stop(struct net_device *dev);
 220 static int cpmac_open(struct net_device *dev);
 221
 222 static void cpmac_dump_regs(struct net_device *dev)
 223 {
 224         int i;
 225         struct cpmac_priv *priv = netdev_priv(dev);
 226         for (i = 0; i < CPMAC_REG_END; i += 4) {
 227                 if (i % 16 == 0) {
 228                         if (i)
 229                                 printk("\n");
 230                         printk(KERN_DEBUG "%s: reg[%p]:", dev->name,
 231                                priv->regs + i);
 232                 }
 233                 printk(" %08x", cpmac_read(priv->regs, i));
 234         }
 235         printk("\n");
 236 }
 237
 238 static void cpmac_dump_desc(struct net_device *dev, struct cpmac_desc *desc)
 239 {
 240         int i;
 241         printk(KERN_DEBUG "%s: desc[%p]:", dev->name, desc);
 242         for (i = 0; i < sizeof(*desc) / 4; i++)
 243                 printk(" %08x", ((u32 *)desc)[i]);
 244         printk("\n");
 245 }
 246
 247 static void cpmac_dump_all_desc(struct net_device *dev)
 248 {
 249         struct cpmac_priv *priv = netdev_priv(dev);
 250         struct cpmac_desc *dump = priv->rx_head;
 251         do {
 252                 cpmac_dump_desc(dev, dump);
 253                 dump = dump->next;
 254         } while (dump != priv->rx_head);
 255 }
 256
 257 static void cpmac_dump_skb(struct net_device *dev, struct sk_buff *skb)
 258 {
 259         int i;
 260         printk(KERN_DEBUG "%s: skb 0x%p, len=%d\n", dev->name, skb, skb->len);
 261         for (i = 0; i < skb->len; i++) {
 262                 if (i % 16 == 0) {
 263                         if (i)
 264                                 printk("\n");
 265                         printk(KERN_DEBUG "%s: data[%p]:", dev->name,
 266                                skb->data + i);
 267                 }
 268                 printk(" %02x", ((u8 *)skb->data)[i]);
 269         }
 270         printk("\n");
 271 }
 272
 273 static int cpmac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 274 {
 275         u32 val;
 276
 277         while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
 278                 cpu_relax();
 279         cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_REG(reg) |
 280                     MDIO_PHY(phy_id));
 281         while ((val = cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0))) & MDIO_BUSY)
 282                 cpu_relax();
 283         return MDIO_DATA(val);
 284 }
 285
 286 static int cpmac_mdio_write(struct mii_bus *bus, int phy_id,
 287                             int reg, u16 val)
 288 {
 289         while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
 290                 cpu_relax();
 291         cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_WRITE |
 292                     MDIO_REG(reg) | MDIO_PHY(phy_id) | MDIO_DATA(val));
 293         return 0;
 294 }
 295
 296 static int cpmac_mdio_reset(struct mii_bus *bus)
 297 {
 298         ar7_device_reset(AR7_RESET_BIT_MDIO);
 299         cpmac_write(bus->priv, CPMAC_MDIO_CONTROL, MDIOC_ENABLE |
 300                     MDIOC_CLKDIV(ar7_cpmac_freq() / 2200000 - 1));
 301         return 0;
 302 }
 303
 304 static int mii_irqs[PHY_MAX_ADDR] = { PHY_POLL, };
 305
 306 static struct mii_bus cpmac_mii = {
 307         .name = "cpmac-mii",
 308         .read = cpmac_mdio_read,
 309         .write = cpmac_mdio_write,
 310         .reset = cpmac_mdio_reset,
 311         .irq = mii_irqs,
 312 };
 313
 314 static int cpmac_config(struct net_device *dev, struct ifmap *map)
 315 {
 316         if (dev->flags & IFF_UP)
 317                 return -EBUSY;
 318
 319         /* Don't allow changing the I/O address */
 320         if (map->base_addr != dev->base_addr)
 321                 return -EOPNOTSUPP;
 322
 323         /* ignore other fields */
 324         return 0;
 325 }
 326
 327 static void cpmac_set_multicast_list(struct net_device *dev)
 328 {
 329         struct dev_mc_list *iter;
 330         int i;
 331         u8 tmp;
 332         u32 mbp, bit, hash[2] = { 0, };
 333         struct cpmac_priv *priv = netdev_priv(dev);
 334
 335         mbp = cpmac_read(priv->regs, CPMAC_MBP);
 336         if (dev->flags & IFF_PROMISC) {
 337                 cpmac_write(priv->regs, CPMAC_MBP, (mbp & ~MBP_PROMISCCHAN(0)) |
 338                             MBP_RXPROMISC);
 339         } else {
 340                 cpmac_write(priv->regs, CPMAC_MBP, mbp & ~MBP_RXPROMISC);
 341                 if (dev->flags & IFF_ALLMULTI) {
 342                         /* enable all multicast mode */
 343                         cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, 0xffffffff);
 344                         cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, 0xffffffff);
 345                 } else {
 346                         /*
 347                          * cpmac uses some strange mac address hashing
 348                          * (not crc32)
 349                          */
 350                         for (i = 0, iter = dev->mc_list; i < dev->mc_count;
 351                              i++, iter = iter->next) {
 352                                 bit = 0;
 353                                 tmp = iter->dmi_addr[0];
 354                                 bit  ^= (tmp >> 2) ^ (tmp << 4);
 355                                 tmp = iter->dmi_addr[1];
 356                                 bit  ^= (tmp >> 4) ^ (tmp << 2);
 357                                 tmp = iter->dmi_addr[2];
 358                                 bit  ^= (tmp >> 6) ^ tmp;
 359                                 tmp = iter->dmi_addr[3];
 360                                 bit  ^= (tmp >> 2) ^ (tmp << 4);
 361                                 tmp = iter->dmi_addr[4];
 362                                 bit  ^= (tmp >> 4) ^ (tmp << 2);
 363                                 tmp = iter->dmi_addr[5];
 364                                 bit  ^= (tmp >> 6) ^ tmp;
 365                                 bit &= 0x3f;
 366                                 hash[bit / 32] |= 1 << (bit % 32);
 367                         }
 368
 369                         cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, hash[0]);
 370                         cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, hash[1]);
 371                 }
 372         }
 373 }
 374
 375 static struct sk_buff *cpmac_rx_one(struct cpmac_priv *priv,
 376                                     struct cpmac_desc *desc)
 377 {
 378         struct sk_buff *skb, *result = NULL;
 379
 380         if (unlikely(netif_msg_hw(priv)))
 381                 cpmac_dump_desc(priv->dev, desc);
 382         cpmac_write(priv->regs, CPMAC_RX_ACK(0), (u32)desc->mapping);
 383         if (unlikely(!desc->datalen)) {
 384                 if (netif_msg_rx_err(priv) && net_ratelimit())
 385                         printk(KERN_WARNING "%s: rx: spurious interrupt\n",
 386                                priv->dev->name);
 387                 return NULL;
 388         }
 389
 390         skb = netdev_alloc_skb(priv->dev, CPMAC_SKB_SIZE);
 391         if (likely(skb)) {
 392                 skb_reserve(skb, 2);
 393                 skb_put(desc->skb, desc->datalen);
 394                 desc->skb->protocol = eth_type_trans(desc->skb, priv->dev);
 395                 desc->skb->ip_summed = CHECKSUM_NONE;
 396                 priv->dev->stats.rx_packets++;
 397                 priv->dev->stats.rx_bytes += desc->datalen;
 398                 result = desc->skb;
 399                 dma_unmap_single(&priv->dev->dev, desc->data_mapping,
 400                                  CPMAC_SKB_SIZE, DMA_FROM_DEVICE);
 401                 desc->skb = skb;
 402                 desc->data_mapping = dma_map_single(&priv->dev->dev, skb->data,
 403                                                     CPMAC_SKB_SIZE,
 404                                                     DMA_FROM_DEVICE);
 405                 desc->hw_data = (u32)desc->data_mapping;
 406                 if (unlikely(netif_msg_pktdata(priv))) {
 407                         printk(KERN_DEBUG "%s: received packet:\n",
 408                                priv->dev->name);
 409                         cpmac_dump_skb(priv->dev, result);
 410                 }
 411         } else {
 412                 if (netif_msg_rx_err(priv) && net_ratelimit())
 413                         printk(KERN_WARNING
 414                                "%s: low on skbs, dropping packet\n",
 415                                priv->dev->name);
 416                 priv->dev->stats.rx_dropped++;
 417         }
 418
 419         desc->buflen = CPMAC_SKB_SIZE;
 420         desc->dataflags = CPMAC_OWN;
 421
 422         return result;
 423 }
 424
 425 static int cpmac_poll(struct napi_struct *napi, int budget)
 426 {
 427         struct sk_buff *skb;
 428         struct cpmac_desc *desc, *restart;
 429         struct cpmac_priv *priv = container_of(napi, struct cpmac_priv, napi);
 430         int received = 0, processed = 0;
 431
 432         spin_lock(&priv->rx_lock);
 433         if (unlikely(!priv->rx_head)) {
 434                 if (netif_msg_rx_err(priv) && net_ratelimit())
 435                         printk(KERN_WARNING "%s: rx: polling, but no queue\n",
 436                                priv->dev->name);
 437                 spin_unlock(&priv->rx_lock);
 438                 netif_rx_complete(priv->dev, napi);
 439                 return 0;
 440         }
 441
 442         desc = priv->rx_head;
 443         restart = NULL;
 444         while (((desc->dataflags & CPMAC_OWN) == 0) && (received < budget)) {
 445                 processed++;
 446
 447                 if ((desc->dataflags & CPMAC_EOQ) != 0) {
 448                         /* The last update to eoq->hw_next didn't happen
 449                         * soon enough, and the receiver stopped here.
 450                         *Remember this descriptor so we can restart
 451                         * the receiver after freeing some space.
 452                         */
 453                         if (unlikely(restart)) {
 454                                 if (netif_msg_rx_err(priv))
 455                                         printk(KERN_ERR "%s: poll found a"
 456                                                 " duplicate EOQ: %p and %p\n",
 457                                                 priv->dev->name, restart, desc);
 458                                 goto fatal_error;
 459                         }
 460
 461                         restart = desc->next;
 462                 }
 463
 464                 skb = cpmac_rx_one(priv, desc);
 465                 if (likely(skb)) {
 466                         netif_receive_skb(skb);
 467                         received++;
 468                 }
 469                 desc = desc->next;
 470         }
 471
 472         if (desc != priv->rx_head) {
 473                 /* We freed some buffers, but not the whole ring,
 474                  * add what we did free to the rx list */
 475                 desc->prev->hw_next = (u32)0;
 476                 priv->rx_head->prev->hw_next = priv->rx_head->mapping;
 477         }
 478
 479         /* Optimization: If we did not actually process an EOQ (perhaps because
 480          * of quota limits), check to see if the tail of the queue has EOQ set.
 481         * We should immediately restart in that case so that the receiver can
 482         * restart and run in parallel with more packet processing.
 483         * This lets us handle slightly larger bursts before running
 484         * out of ring space (assuming dev->weight < ring_size) */
 485
 486         if (!restart &&
 487              (priv->rx_head->prev->dataflags & (CPMAC_OWN|CPMAC_EOQ))
 488                     == CPMAC_EOQ &&
 489              (priv->rx_head->dataflags & CPMAC_OWN) != 0) {
 490                 /* reset EOQ so the poll loop (above) doesn't try to
 491                 * restart this when it eventually gets to this descriptor.
 492                 */
 493                 priv->rx_head->prev->dataflags &= ~CPMAC_EOQ;
 494                 restart = priv->rx_head;
 495         }
 496
 497         if (restart) {
 498                 priv->dev->stats.rx_errors++;
 499                 priv->dev->stats.rx_fifo_errors++;
 500                 if (netif_msg_rx_err(priv) && net_ratelimit())
 501                         printk(KERN_WARNING "%s: rx dma ring overrun\n",
 502                                priv->dev->name);
 503
 504                 if (unlikely((restart->dataflags & CPMAC_OWN) == 0)) {
 505                         if (netif_msg_drv(priv))
 506                                 printk(KERN_ERR "%s: cpmac_poll is trying to "
 507                                         "restart rx from a descriptor that's "
 508                                         "not free: %p\n",
 509                                         priv->dev->name, restart);
 510                                 goto fatal_error;
 511                 }
 512
 513                 cpmac_write(priv->regs, CPMAC_RX_PTR(0), restart->mapping);
 514         }
 515
 516         priv->rx_head = desc;
 517         spin_unlock(&priv->rx_lock);
 518         if (unlikely(netif_msg_rx_status(priv)))
 519                 printk(KERN_DEBUG "%s: poll processed %d packets\n",
 520                        priv->dev->name, received);
 521         if (processed == 0) {
 522                 /* we ran out of packets to read,
 523                  * revert to interrupt-driven mode */
 524                 netif_rx_complete(priv->dev, napi);
 525                 cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
 526                 return 0;
 527         }
 528
 529         return 1;
 530
 531 fatal_error:
 532         /* Something went horribly wrong.
 533          * Reset hardware to try to recover rather than wedging. */
 534
 535         if (netif_msg_drv(priv)) {
 536                 printk(KERN_ERR "%s: cpmac_poll is confused. "
 537                                 "Resetting hardware\n", priv->dev->name);
 538                 cpmac_dump_all_desc(priv->dev);
 539                 printk(KERN_DEBUG "%s: RX_PTR(0)=0x%08x RX_ACK(0)=0x%08x\n",
 540                         priv->dev->name,
 541                         cpmac_read(priv->regs, CPMAC_RX_PTR(0)),
 542                         cpmac_read(priv->regs, CPMAC_RX_ACK(0)));
 543         }
 544
 545         spin_unlock(&priv->rx_lock);
 546         netif_rx_complete(priv->dev, napi);
 547         netif_tx_stop_all_queues(priv->dev);
 548         napi_disable(&priv->napi);
 549
 550         atomic_inc(&priv->reset_pending);
 551         cpmac_hw_stop(priv->dev);
 552         if (!schedule_work(&priv->reset_work))
 553                 atomic_dec(&priv->reset_pending);
 554         return 0;
 555
 556 }
 557
 558 static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
 559 {
 560         int queue, len;
 561         struct cpmac_desc *desc;
 562         struct cpmac_priv *priv = netdev_priv(dev);
 563
 564         if (unlikely(atomic_read(&priv->reset_pending)))
 565                 return NETDEV_TX_BUSY;
 566
 567         if (unlikely(skb_padto(skb, ETH_ZLEN)))
 568                 return NETDEV_TX_OK;
 569
 570         len = max(skb->len, ETH_ZLEN);
 571         queue = skb_get_queue_mapping(skb);
 572         netif_stop_subqueue(dev, queue);
 573
 574         desc = &priv->desc_ring[queue];
 575         if (unlikely(desc->dataflags & CPMAC_OWN)) {
 576                 if (netif_msg_tx_err(priv) && net_ratelimit())
 577                         printk(KERN_WARNING "%s: tx dma ring full\n",
 578                                dev->name);
 579                 return NETDEV_TX_BUSY;
 580         }
 581
 582         spin_lock(&priv->lock);
 583         dev->trans_start = jiffies;
 584         spin_unlock(&priv->lock);
 585         desc->dataflags = CPMAC_SOP | CPMAC_EOP | CPMAC_OWN;
 586         desc->skb = skb;
 587         desc->data_mapping = dma_map_single(&dev->dev, skb->data, len,
 588                                             DMA_TO_DEVICE);
 589         desc->hw_data = (u32)desc->data_mapping;
 590         desc->datalen = len;
 591         desc->buflen = len;
 592         if (unlikely(netif_msg_tx_queued(priv)))
 593                 printk(KERN_DEBUG "%s: sending 0x%p, len=%d\n", dev->name, skb,
 594                        skb->len);
 595         if (unlikely(netif_msg_hw(priv)))
 596                 cpmac_dump_desc(dev, desc);
 597         if (unlikely(netif_msg_pktdata(priv)))
 598                 cpmac_dump_skb(dev, skb);
 599         cpmac_write(priv->regs, CPMAC_TX_PTR(queue), (u32)desc->mapping);
 600
 601         return NETDEV_TX_OK;
 602 }
 603
 604 static void cpmac_end_xmit(struct net_device *dev, int queue)
 605 {
 606         struct cpmac_desc *desc;
 607         struct cpmac_priv *priv = netdev_priv(dev);
 608
 609         desc = &priv->desc_ring[queue];
 610         cpmac_write(priv->regs, CPMAC_TX_ACK(queue), (u32)desc->mapping);
 611         if (likely(desc->skb)) {
 612                 spin_lock(&priv->lock);
 613                 dev->stats.tx_packets++;
 614                 dev->stats.tx_bytes += desc->skb->len;
 615                 spin_unlock(&priv->lock);
 616                 dma_unmap_single(&dev->dev, desc->data_mapping, desc->skb->len,
 617                                  DMA_TO_DEVICE);
 618
 619                 if (unlikely(netif_msg_tx_done(priv)))
 620                         printk(KERN_DEBUG "%s: sent 0x%p, len=%d\n", dev->name,
 621                                desc->skb, desc->skb->len);
 622
 623                 dev_kfree_skb_irq(desc->skb);
 624                 desc->skb = NULL;
 625                 if (netif_subqueue_stopped(dev, queue))
 626                         netif_wake_subqueue(dev, queue);
 627         } else {
 628                 if (netif_msg_tx_err(priv) && net_ratelimit())
 629                         printk(KERN_WARNING
 630                                "%s: end_xmit: spurious interrupt\n", dev->name);
 631                 if (netif_subqueue_stopped(dev, queue))
 632                         netif_wake_subqueue(dev, queue);
 633         }
 634 }
 635
 636 static void cpmac_hw_stop(struct net_device *dev)
 637 {
 638         int i;
 639         struct cpmac_priv *priv = netdev_priv(dev);
 640         struct plat_cpmac_data *pdata = priv->pdev->dev.platform_data;
 641
 642         ar7_device_reset(pdata->reset_bit);
 643         cpmac_write(priv->regs, CPMAC_RX_CONTROL,
 644                     cpmac_read(priv->regs, CPMAC_RX_CONTROL) & ~1);
 645         cpmac_write(priv->regs, CPMAC_TX_CONTROL,
 646                     cpmac_read(priv->regs, CPMAC_TX_CONTROL) & ~1);
 647         for (i = 0; i < 8; i++) {
 648                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
 649                 cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
 650         }
 651         cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
 652         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
 653         cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
 654         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 655         cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
 656                     cpmac_read(priv->regs, CPMAC_MAC_CONTROL) & ~MAC_MII);
 657 }
 658
 659 static void cpmac_hw_start(struct net_device *dev)
 660 {
 661         int i;
 662         struct cpmac_priv *priv = netdev_priv(dev);
 663         struct plat_cpmac_data *pdata = priv->pdev->dev.platform_data;
 664
 665         ar7_device_reset(pdata->reset_bit);
 666         for (i = 0; i < 8; i++) {
 667                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
 668                 cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
 669         }
 670         cpmac_write(priv->regs, CPMAC_RX_PTR(0), priv->rx_head->mapping);
 671
 672         cpmac_write(priv->regs, CPMAC_MBP, MBP_RXSHORT | MBP_RXBCAST |
 673                     MBP_RXMCAST);
 674         cpmac_write(priv->regs, CPMAC_BUFFER_OFFSET, 0);
 675         for (i = 0; i < 8; i++)
 676                 cpmac_write(priv->regs, CPMAC_MAC_ADDR_LO(i), dev->dev_addr[5]);
 677         cpmac_write(priv->regs, CPMAC_MAC_ADDR_MID, dev->dev_addr[4]);
 678         cpmac_write(priv->regs, CPMAC_MAC_ADDR_HI, dev->dev_addr[0] |
 679                     (dev->dev_addr[1] << 8) | (dev->dev_addr[2] << 16) |
 680                     (dev->dev_addr[3] << 24));
 681         cpmac_write(priv->regs, CPMAC_MAX_LENGTH, CPMAC_SKB_SIZE);
 682         cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
 683         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
 684         cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
 685         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 686         cpmac_write(priv->regs, CPMAC_UNICAST_ENABLE, 1);
 687         cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
 688         cpmac_write(priv->regs, CPMAC_TX_INT_ENABLE, 0xff);
 689         cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
 690
 691         cpmac_write(priv->regs, CPMAC_RX_CONTROL,
 692                     cpmac_read(priv->regs, CPMAC_RX_CONTROL) | 1);
 693         cpmac_write(priv->regs, CPMAC_TX_CONTROL,
 694                     cpmac_read(priv->regs, CPMAC_TX_CONTROL) | 1);
 695         cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
 696                     cpmac_read(priv->regs, CPMAC_MAC_CONTROL) | MAC_MII |
 697                     MAC_FDX);
 698 }
 699
 700 static void cpmac_clear_rx(struct net_device *dev)
 701 {
 702         struct cpmac_priv *priv = netdev_priv(dev);
 703         struct cpmac_desc *desc;
 704         int i;
 705         if (unlikely(!priv->rx_head))
 706                 return;
 707         desc = priv->rx_head;
 708         for (i = 0; i < priv->ring_size; i++) {
 709                 if ((desc->dataflags & CPMAC_OWN) == 0) {
 710                         if (netif_msg_rx_err(priv) && net_ratelimit())
 711                                 printk(KERN_WARNING "%s: packet dropped\n",
 712                                        dev->name);
 713                         if (unlikely(netif_msg_hw(priv)))
 714                                 cpmac_dump_desc(dev, desc);
 715                         desc->dataflags = CPMAC_OWN;
 716                         dev->stats.rx_dropped++;
 717                 }
 718                 desc->hw_next = desc->next->mapping;
 719                 desc = desc->next;
 720         }
 721         priv->rx_head->prev->hw_next = 0;
 722 }
 723
 724 static void cpmac_clear_tx(struct net_device *dev)
 725 {
 726         struct cpmac_priv *priv = netdev_priv(dev);
 727         int i;
 728         if (unlikely(!priv->desc_ring))
 729                 return;
 730         for (i = 0; i < CPMAC_QUEUES; i++) {
 731                 priv->desc_ring[i].dataflags = 0;
 732                 if (priv->desc_ring[i].skb) {
 733                         dev_kfree_skb_any(priv->desc_ring[i].skb);
 734                         priv->desc_ring[i].skb = NULL;
 735                 }
 736         }
 737 }
 738
 739 static void cpmac_hw_error(struct work_struct *work)
 740 {
 741         int i;
 742         struct cpmac_priv *priv =
 743                 container_of(work, struct cpmac_priv, reset_work);
 744
 745         spin_lock(&priv->rx_lock);
 746         cpmac_clear_rx(priv->dev);
 747         spin_unlock(&priv->rx_lock);
 748         cpmac_clear_tx(priv->dev);
 749         cpmac_hw_start(priv->dev);
 750         barrier();
 751         atomic_dec(&priv->reset_pending);
 752
 753         netif_tx_wake_all_queues(priv->dev);
 754         cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
 755 }
 756
 757 static void cpmac_check_status(struct net_device *dev)
 758 {
 759         struct cpmac_priv *priv = netdev_priv(dev);
 760
 761         u32 macstatus = cpmac_read(priv->regs, CPMAC_MAC_STATUS);
 762         int rx_channel = (macstatus >> 8) & 7;
 763         int rx_code = (macstatus >> 12) & 15;
 764         int tx_channel = (macstatus >> 16) & 7;
 765         int tx_code = (macstatus >> 20) & 15;
 766
 767         if (rx_code || tx_code) {
 768                 if (netif_msg_drv(priv) && net_ratelimit()) {
 769                         /* Can't find any documentation on what these
 770                          *error codes actually are. So just log them and hope..
 771                          */
 772                         if (rx_code)
 773                                 printk(KERN_WARNING "%s: host error %d on rx "
 774                                      "channel %d (macstatus %08x), resetting\n",
 775                                      dev->name, rx_code, rx_channel, macstatus);
 776                         if (tx_code)
 777                                 printk(KERN_WARNING "%s: host error %d on tx "
 778                                      "channel %d (macstatus %08x), resetting\n",
 779                                      dev->name, tx_code, tx_channel, macstatus);
 780                 }
 781
 782                 netif_tx_stop_all_queues(dev);
 783                 cpmac_hw_stop(dev);
 784                 if (schedule_work(&priv->reset_work))
 785                         atomic_inc(&priv->reset_pending);
 786                 if (unlikely(netif_msg_hw(priv)))
 787                         cpmac_dump_regs(dev);
 788         }
 789         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 790 }
 791
 792 static irqreturn_t cpmac_irq(int irq, void *dev_id)
 793 {
 794         struct net_device *dev = dev_id;
 795         struct cpmac_priv *priv;
 796         int queue;
 797         u32 status;
 798
 799         priv = netdev_priv(dev);
 800
 801         status = cpmac_read(priv->regs, CPMAC_MAC_INT_VECTOR);
 802
 803         if (unlikely(netif_msg_intr(priv)))
 804                 printk(KERN_DEBUG "%s: interrupt status: 0x%08x\n", dev->name,
 805                        status);
 806
 807         if (status & MAC_INT_TX)
 808                 cpmac_end_xmit(dev, (status & 7));
 809
 810         if (status & MAC_INT_RX) {
 811                 queue = (status >> 8) & 7;
 812                 if (netif_rx_schedule_prep(dev, &priv->napi)) {
 813                         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 1 << queue);
 814                         __netif_rx_schedule(dev, &priv->napi);
 815                 }
 816         }
 817
 818         cpmac_write(priv->regs, CPMAC_MAC_EOI_VECTOR, 0);
 819
 820         if (unlikely(status & (MAC_INT_HOST | MAC_INT_STATUS)))
 821                 cpmac_check_status(dev);
 822
 823         return IRQ_HANDLED;
 824 }
 825
 826 static void cpmac_tx_timeout(struct net_device *dev)
 827 {
 828         int i;
 829         struct cpmac_priv *priv = netdev_priv(dev);
 830
 831         spin_lock(&priv->lock);
 832         dev->stats.tx_errors++;
 833         spin_unlock(&priv->lock);
 834         if (netif_msg_tx_err(priv) && net_ratelimit())
 835                 printk(KERN_WARNING "%s: transmit timeout\n", dev->name);
 836
 837         atomic_inc(&priv->reset_pending);
 838         barrier();
 839         cpmac_clear_tx(dev);
 840         barrier();
 841         atomic_dec(&priv->reset_pending);
 842
 843         netif_tx_wake_all_queues(priv->dev);
 844 }
 845
 846 static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 847 {
 848         struct cpmac_priv *priv = netdev_priv(dev);
 849         if (!(netif_running(dev)))
 850                 return -EINVAL;
 851         if (!priv->phy)
 852                 return -EINVAL;
 853         if ((cmd == SIOCGMIIPHY) || (cmd == SIOCGMIIREG) ||
 854             (cmd == SIOCSMIIREG))
 855                 return phy_mii_ioctl(priv->phy, if_mii(ifr), cmd);
 856
 857         return -EOPNOTSUPP;
 858 }
 859
 860 static int cpmac_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 861 {
 862         struct cpmac_priv *priv = netdev_priv(dev);
 863
 864         if (priv->phy)
 865                 return phy_ethtool_gset(priv->phy, cmd);
 866
 867         return -EINVAL;
 868 }
 869
 870 static int cpmac_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 871 {
 872         struct cpmac_priv *priv = netdev_priv(dev);
 873
 874         if (!capable(CAP_NET_ADMIN))
 875                 return -EPERM;
 876
 877         if (priv->phy)
 878                 return phy_ethtool_sset(priv->phy, cmd);
 879
 880         return -EINVAL;
 881 }
 882
 883 static void cpmac_get_ringparam(struct net_device *dev, struct ethtool_ringparam* ring)
 884 {
 885         struct cpmac_priv *priv = netdev_priv(dev);
 886
 887         ring->rx_max_pending = 1024;
 888         ring->rx_mini_max_pending = 1;
 889         ring->rx_jumbo_max_pending = 1;
 890         ring->tx_max_pending = 1;
 891
 892         ring->rx_pending = priv->ring_size;
 893         ring->rx_mini_pending = 1;
 894         ring->rx_jumbo_pending = 1;
 895         ring->tx_pending = 1;
 896 }
 897
 898 static int cpmac_set_ringparam(struct net_device *dev, struct ethtool_ringparam* ring)
 899 {
 900         struct cpmac_priv *priv = netdev_priv(dev);
 901
 902         if (netif_running(dev))
 903                 return -EBUSY;
 904         priv->ring_size = ring->rx_pending;
 905         return 0;
 906 }
 907
 908 static void cpmac_get_drvinfo(struct net_device *dev,
 909                               struct ethtool_drvinfo *info)
 910 {
 911         strcpy(info->driver, "cpmac");
 912         strcpy(info->version, CPMAC_VERSION);
 913         info->fw_version[0] = '\0';
 914         sprintf(info->bus_info, "%s", "cpmac");
 915         info->regdump_len = 0;
 916 }
 917
 918 static const struct ethtool_ops cpmac_ethtool_ops = {
 919         .get_settings = cpmac_get_settings,
 920         .set_settings = cpmac_set_settings,
 921         .get_drvinfo = cpmac_get_drvinfo,
 922         .get_link = ethtool_op_get_link,
 923         .get_ringparam = cpmac_get_ringparam,
 924         .set_ringparam = cpmac_set_ringparam,
 925 };
 926
 927 static void cpmac_adjust_link(struct net_device *dev)
 928 {
 929         struct cpmac_priv *priv = netdev_priv(dev);
 930         int new_state = 0;
 931
 932         spin_lock(&priv->lock);
 933         if (priv->phy->link) {
 934                 netif_tx_start_all_queues(dev);
 935                 if (priv->phy->duplex != priv->oldduplex) {
 936                         new_state = 1;
 937                         priv->oldduplex = priv->phy->duplex;
 938                 }
 939
 940                 if (priv->phy->speed != priv->oldspeed) {
 941                         new_state = 1;
 942                         priv->oldspeed = priv->phy->speed;
 943                 }
 944
 945                 if (!priv->oldlink) {
 946                         new_state = 1;
 947                         priv->oldlink = 1;
 948                 }
 949         } else if (priv->oldlink) {
 950                 new_state = 1;
 951                 priv->oldlink = 0;
 952                 priv->oldspeed = 0;
 953                 priv->oldduplex = -1;
 954         }
 955
 956         if (new_state && netif_msg_link(priv) && net_ratelimit())
 957                 phy_print_status(priv->phy);
 958
 959         spin_unlock(&priv->lock);
 960 }
 961
 962 static int cpmac_open(struct net_device *dev)
 963 {
 964         int i, size, res;
 965         struct cpmac_priv *priv = netdev_priv(dev);
 966         struct resource *mem;
 967         struct cpmac_desc *desc;
 968         struct sk_buff *skb;
 969
 970         mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
 971         if (!request_mem_region(mem->start, mem->end - mem->start, dev->name)) {
 972                 if (netif_msg_drv(priv))
 973                         printk(KERN_ERR "%s: failed to request registers\n",
 974                                dev->name);
 975                 res = -ENXIO;
 976                 goto fail_reserve;
 977         }
 978
 979         priv->regs = ioremap(mem->start, mem->end - mem->start);
 980         if (!priv->regs) {
 981                 if (netif_msg_drv(priv))
 982                         printk(KERN_ERR "%s: failed to remap registers\n",
 983                                dev->name);
 984                 res = -ENXIO;
 985                 goto fail_remap;
 986         }
 987
 988         size = priv->ring_size + CPMAC_QUEUES;
 989         priv->desc_ring = dma_alloc_coherent(&dev->dev,
 990                                              sizeof(struct cpmac_desc) * size,
 991                                              &priv->dma_ring,
 992                                              GFP_KERNEL);
 993         if (!priv->desc_ring) {
 994                 res = -ENOMEM;
 995                 goto fail_alloc;
 996         }
 997
 998         for (i = 0; i < size; i++)
 999                 priv->desc_ring[i].mapping = priv->dma_ring + sizeof(*desc) * i;
1000
1001         priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
1002         for (i = 0, desc = priv->rx_head; i < priv->ring_size; i++, desc++) {
1003                 skb = netdev_alloc_skb(dev, CPMAC_SKB_SIZE);
1004                 if (unlikely(!skb)) {
1005                         res = -ENOMEM;
1006                         goto fail_desc;
1007                 }
1008                 skb_reserve(skb, 2);
1009                 desc->skb = skb;
1010                 desc->data_mapping = dma_map_single(&dev->dev, skb->data,
1011                                                     CPMAC_SKB_SIZE,
1012                                                     DMA_FROM_DEVICE);
1013                 desc->hw_data = (u32)desc->data_mapping;
1014                 desc->buflen = CPMAC_SKB_SIZE;
1015                 desc->dataflags = CPMAC_OWN;
1016                 desc->next = &priv->rx_head[(i + 1) % priv->ring_size];
1017                 desc->next->prev = desc;
1018                 desc->hw_next = (u32)desc->next->mapping;
1019         }
1020
1021         priv->rx_head->prev->hw_next = (u32)0;
1022
1023         if ((res = request_irq(dev->irq, cpmac_irq, IRQF_SHARED,
1024                                dev->name, dev))) {
1025                 if (netif_msg_drv(priv))
1026                         printk(KERN_ERR "%s: failed to obtain irq\n",
1027                                dev->name);
1028                 goto fail_irq;
1029         }
1030
1031         atomic_set(&priv->reset_pending, 0);
1032         INIT_WORK(&priv->reset_work, cpmac_hw_error);
1033         cpmac_hw_start(dev);
1034
1035         napi_enable(&priv->napi);
1036         priv->phy->state = PHY_CHANGELINK;
1037         phy_start(priv->phy);
1038
1039         return 0;
1040
1041 fail_irq:
1042 fail_desc:
1043         for (i = 0; i < priv->ring_size; i++) {
1044                 if (priv->rx_head[i].skb) {
1045                         dma_unmap_single(&dev->dev,
1046                                          priv->rx_head[i].data_mapping,
1047                                          CPMAC_SKB_SIZE,
1048                                          DMA_FROM_DEVICE);
1049                         kfree_skb(priv->rx_head[i].skb);
1050                 }
1051         }
1052 fail_alloc:
1053         kfree(priv->desc_ring);
1054         iounmap(priv->regs);
1055
1056 fail_remap:
1057         release_mem_region(mem->start, mem->end - mem->start);
1058
1059 fail_reserve:
1060         return res;
1061 }
1062
1063 static int cpmac_stop(struct net_device *dev)
1064 {
1065         int i;
1066         struct cpmac_priv *priv = netdev_priv(dev);
1067         struct resource *mem;
1068
1069         netif_tx_stop_all_queues(dev);
1070
1071         cancel_work_sync(&priv->reset_work);
1072         napi_disable(&priv->napi);
1073         phy_stop(priv->phy);
1074
1075         cpmac_hw_stop(dev);
1076
1077         for (i = 0; i < 8; i++)
1078                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
1079         cpmac_write(priv->regs, CPMAC_RX_PTR(0), 0);
1080         cpmac_write(priv->regs, CPMAC_MBP, 0);
1081
1082         free_irq(dev->irq, dev);
1083         iounmap(priv->regs);
1084         mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
1085         release_mem_region(mem->start, mem->end - mem->start);
1086         priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
1087         for (i = 0; i < priv->ring_size; i++) {
1088                 if (priv->rx_head[i].skb) {
1089                         dma_unmap_single(&dev->dev,
1090                                          priv->rx_head[i].data_mapping,
1091                                          CPMAC_SKB_SIZE,
1092                                          DMA_FROM_DEVICE);
1093                         kfree_skb(priv->rx_head[i].skb);
1094                 }
1095         }
1096
1097         dma_free_coherent(&dev->dev, sizeof(struct cpmac_desc) *
1098                           (CPMAC_QUEUES + priv->ring_size),
1099                           priv->desc_ring, priv->dma_ring);
1100         return 0;
1101 }
1102
1103 static int external_switch;
1104
1105 static int __devinit cpmac_probe(struct platform_device *pdev)
1106 {
1107         int rc, phy_id, i;
1108         char *mdio_bus_id = "0";
1109         struct resource *mem;
1110         struct cpmac_priv *priv;
1111         struct net_device *dev;
1112         struct plat_cpmac_data *pdata;
1113         DECLARE_MAC_BUF(mac);
1114
1115         pdata = pdev->dev.platform_data;
1116
1117         for (phy_id = 0; phy_id < PHY_MAX_ADDR; phy_id++) {
1118                 if (!(pdata->phy_mask & (1 << phy_id)))
1119                         continue;
1120                 if (!cpmac_mii.phy_map[phy_id])
1121                         continue;
1122                 break;
1123         }
1124
1125         if (phy_id == PHY_MAX_ADDR) {
1126                 if (external_switch || dumb_switch) {
1127                         mdio_bus_id = 0; /* fixed phys bus */
1128                         phy_id = pdev->id;
1129                 } else {
1130                         dev_err(&pdev->dev, "no PHY present\n");
1131                         return -ENODEV;
1132                 }
1133         }
1134
1135         dev = alloc_etherdev_mq(sizeof(*priv), CPMAC_QUEUES);
1136
1137         if (!dev) {
1138                 printk(KERN_ERR "cpmac: Unable to allocate net_device\n");
1139                 return -ENOMEM;
1140         }
1141
1142         platform_set_drvdata(pdev, dev);
1143         priv = netdev_priv(dev);
1144
1145         priv->pdev = pdev;
1146         mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
1147         if (!mem) {
1148                 rc = -ENODEV;
1149                 goto fail;
1150         }
1151
1152         dev->irq = platform_get_irq_byname(pdev, "irq");
1153
1154         dev->open               = cpmac_open;
1155         dev->stop               = cpmac_stop;
1156         dev->set_config         = cpmac_config;
1157         dev->hard_start_xmit    = cpmac_start_xmit;
1158         dev->do_ioctl           = cpmac_ioctl;
1159         dev->set_multicast_list = cpmac_set_multicast_list;
1160         dev->tx_timeout         = cpmac_tx_timeout;
1161         dev->ethtool_ops        = &cpmac_ethtool_ops;
1162
1163         netif_napi_add(dev, &priv->napi, cpmac_poll, 64);
1164
1165         spin_lock_init(&priv->lock);
1166         spin_lock_init(&priv->rx_lock);
1167         priv->dev = dev;
1168         priv->ring_size = 64;
1169         priv->msg_enable = netif_msg_init(debug_level, 0xff);
1170         memcpy(dev->dev_addr, pdata->dev_addr, sizeof(dev->dev_addr));
1171
1172         priv->phy = phy_connect(dev, cpmac_mii.phy_map[phy_id]->dev.bus_id,
1173                                 &cpmac_adjust_link, 0, PHY_INTERFACE_MODE_MII);
1174         if (IS_ERR(priv->phy)) {
1175                 if (netif_msg_drv(priv))
1176                         printk(KERN_ERR "%s: Could not attach to PHY\n",
1177                                dev->name);
1178                 return PTR_ERR(priv->phy);
1179         }
1180
1181         if ((rc = register_netdev(dev))) {
1182                 printk(KERN_ERR "cpmac: error %i registering device %s\n", rc,
1183                        dev->name);
1184                 goto fail;
1185         }
1186
1187         if (netif_msg_probe(priv)) {
1188                 printk(KERN_INFO
1189                        "cpmac: device %s (regs: %p, irq: %d, phy: %s, "
1190                        "mac: %s)\n", dev->name, (void *)mem->start, dev->irq,
1191                        priv->phy_name, print_mac(mac, dev->dev_addr));
1192         }
1193         return 0;
1194
1195 fail:
1196         free_netdev(dev);
1197         return rc;
1198 }
1199
1200 static int __devexit cpmac_remove(struct platform_device *pdev)
1201 {
1202         struct net_device *dev = platform_get_drvdata(pdev);
1203         unregister_netdev(dev);
1204         free_netdev(dev);
1205         return 0;
1206 }
1207
1208 static struct platform_driver cpmac_driver = {
1209         .driver.name = "cpmac",
1210         .driver.owner = THIS_MODULE,
1211         .probe = cpmac_probe,
1212         .remove = __devexit_p(cpmac_remove),
1213 };
1214
1215 int __devinit cpmac_init(void)
1216 {
1217         u32 mask;
1218         int i, res;
1219
1220         cpmac_mii.priv = ioremap(AR7_REGS_MDIO, 256);
1221
1222         if (!cpmac_mii.priv) {
1223                 printk(KERN_ERR "Can't ioremap mdio registers\n");
1224                 return -ENXIO;
1225         }
1226
1227 #warning FIXME: unhardcode gpio&reset bits
1228         ar7_gpio_disable(26);
1229         ar7_gpio_disable(27);
1230         ar7_device_reset(AR7_RESET_BIT_CPMAC_LO);
1231         ar7_device_reset(AR7_RESET_BIT_CPMAC_HI);
1232         ar7_device_reset(AR7_RESET_BIT_EPHY);
1233
1234         cpmac_mii.reset(&cpmac_mii);
1235
1236         for (i = 0; i < 300000; i++)
1237                 if ((mask = cpmac_read(cpmac_mii.priv, CPMAC_MDIO_ALIVE)))
1238                         break;
1239                 else
1240                         cpu_relax();
1241
1242         mask &= 0x7fffffff;
1243         if (mask & (mask - 1)) {
1244                 external_switch = 1;
1245                 mask = 0;
1246         }
1247
1248         cpmac_mii.phy_mask = ~(mask | 0x80000000);
1249         snprintf(cpmac_mii.id, MII_BUS_ID_SIZE, "0");
1250
1251         res = mdiobus_register(&cpmac_mii);
1252         if (res)
1253                 goto fail_mii;
1254
1255         res = platform_driver_register(&cpmac_driver);
1256         if (res)
1257                 goto fail_cpmac;
1258
1259         return 0;
1260
1261 fail_cpmac:
1262         mdiobus_unregister(&cpmac_mii);
1263
1264 fail_mii:
1265         iounmap(cpmac_mii.priv);
1266
1267         return res;
1268 }
1269
1270 void __devexit cpmac_exit(void)
1271 {
1272         platform_driver_unregister(&cpmac_driver);
1273         mdiobus_unregister(&cpmac_mii);
1274         iounmap(cpmac_mii.priv);
1275 }
1276
1277 module_init(cpmac_init);
1278 module_exit(cpmac_exit);