git.oblomov.eu 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
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/mii.h>
  35 #include <linux/phy.h>
  36 #include <linux/phy_fixed.h>
  37 #include <linux/platform_device.h>
  38 #include <linux/dma-mapping.h>
  39 #include <asm/gpio.h>
  40 #include <asm/atomic.h>
  41
  42 MODULE_AUTHOR("Eugene Konev <ejka@imfi.kspu.ru>");
  43 MODULE_DESCRIPTION("TI AR7 ethernet driver (CPMAC)");
  44 MODULE_LICENSE("GPL");
  45 MODULE_ALIAS("platform:cpmac");
  46
  47 static int debug_level = 8;
  48 static int dumb_switch;
  49
  50 /* Next 2 are only used in cpmac_probe, so it's pointless to change them */
  51 module_param(debug_level, int, 0444);
  52 module_param(dumb_switch, int, 0444);
  53
  54 MODULE_PARM_DESC(debug_level, "Number of NETIF_MSG bits to enable");
  55 MODULE_PARM_DESC(dumb_switch, "Assume switch is not connected to MDIO bus");
  56
  57 #define CPMAC_VERSION "0.5.0"
  58 /* frame size + 802.1q tag */
  59 #define CPMAC_SKB_SIZE          (ETH_FRAME_LEN + 4)
  60 #define CPMAC_QUEUES    8
  61
  62 /* Ethernet registers */
  63 #define CPMAC_TX_CONTROL                0x0004
  64 #define CPMAC_TX_TEARDOWN               0x0008
  65 #define CPMAC_RX_CONTROL                0x0014
  66 #define CPMAC_RX_TEARDOWN               0x0018
  67 #define CPMAC_MBP                       0x0100
  68 # define MBP_RXPASSCRC                  0x40000000
  69 # define MBP_RXQOS                      0x20000000
  70 # define MBP_RXNOCHAIN                  0x10000000
  71 # define MBP_RXCMF                      0x01000000
  72 # define MBP_RXSHORT                    0x00800000
  73 # define MBP_RXCEF                      0x00400000
  74 # define MBP_RXPROMISC                  0x00200000
  75 # define MBP_PROMISCCHAN(channel)       (((channel) & 0x7) << 16)
  76 # define MBP_RXBCAST                    0x00002000
  77 # define MBP_BCASTCHAN(channel)         (((channel) & 0x7) << 8)
  78 # define MBP_RXMCAST                    0x00000020
  79 # define MBP_MCASTCHAN(channel)         ((channel) & 0x7)
  80 #define CPMAC_UNICAST_ENABLE            0x0104
  81 #define CPMAC_UNICAST_CLEAR             0x0108
  82 #define CPMAC_MAX_LENGTH                0x010c
  83 #define CPMAC_BUFFER_OFFSET             0x0110
  84 #define CPMAC_MAC_CONTROL               0x0160
  85 # define MAC_TXPTYPE                    0x00000200
  86 # define MAC_TXPACE                     0x00000040
  87 # define MAC_MII                        0x00000020
  88 # define MAC_TXFLOW                     0x00000010
  89 # define MAC_RXFLOW                     0x00000008
  90 # define MAC_MTEST                      0x00000004
  91 # define MAC_LOOPBACK                   0x00000002
  92 # define MAC_FDX                        0x00000001
  93 #define CPMAC_MAC_STATUS                0x0164
  94 # define MAC_STATUS_QOS                 0x00000004
  95 # define MAC_STATUS_RXFLOW              0x00000002
  96 # define MAC_STATUS_TXFLOW              0x00000001
  97 #define CPMAC_TX_INT_ENABLE             0x0178
  98 #define CPMAC_TX_INT_CLEAR              0x017c
  99 #define CPMAC_MAC_INT_VECTOR            0x0180
 100 # define MAC_INT_STATUS                 0x00080000
 101 # define MAC_INT_HOST                   0x00040000
 102 # define MAC_INT_RX                     0x00020000
 103 # define MAC_INT_TX                     0x00010000
 104 #define CPMAC_MAC_EOI_VECTOR            0x0184
 105 #define CPMAC_RX_INT_ENABLE             0x0198
 106 #define CPMAC_RX_INT_CLEAR              0x019c
 107 #define CPMAC_MAC_INT_ENABLE            0x01a8
 108 #define CPMAC_MAC_INT_CLEAR             0x01ac
 109 #define CPMAC_MAC_ADDR_LO(channel)      (0x01b0 + (channel) * 4)
 110 #define CPMAC_MAC_ADDR_MID              0x01d0
 111 #define CPMAC_MAC_ADDR_HI               0x01d4
 112 #define CPMAC_MAC_HASH_LO               0x01d8
 113 #define CPMAC_MAC_HASH_HI               0x01dc
 114 #define CPMAC_TX_PTR(channel)           (0x0600 + (channel) * 4)
 115 #define CPMAC_RX_PTR(channel)           (0x0620 + (channel) * 4)
 116 #define CPMAC_TX_ACK(channel)           (0x0640 + (channel) * 4)
 117 #define CPMAC_RX_ACK(channel)           (0x0660 + (channel) * 4)
 118 #define CPMAC_REG_END                   0x0680
 119 /*
 120  * Rx/Tx statistics
 121  * TODO: use some of them to fill stats in cpmac_stats()
 122  */
 123 #define CPMAC_STATS_RX_GOOD             0x0200
 124 #define CPMAC_STATS_RX_BCAST            0x0204
 125 #define CPMAC_STATS_RX_MCAST            0x0208
 126 #define CPMAC_STATS_RX_PAUSE            0x020c
 127 #define CPMAC_STATS_RX_CRC              0x0210
 128 #define CPMAC_STATS_RX_ALIGN            0x0214
 129 #define CPMAC_STATS_RX_OVER             0x0218
 130 #define CPMAC_STATS_RX_JABBER           0x021c
 131 #define CPMAC_STATS_RX_UNDER            0x0220
 132 #define CPMAC_STATS_RX_FRAG             0x0224
 133 #define CPMAC_STATS_RX_FILTER           0x0228
 134 #define CPMAC_STATS_RX_QOSFILTER        0x022c
 135 #define CPMAC_STATS_RX_OCTETS           0x0230
 136
 137 #define CPMAC_STATS_TX_GOOD             0x0234
 138 #define CPMAC_STATS_TX_BCAST            0x0238
 139 #define CPMAC_STATS_TX_MCAST            0x023c
 140 #define CPMAC_STATS_TX_PAUSE            0x0240
 141 #define CPMAC_STATS_TX_DEFER            0x0244
 142 #define CPMAC_STATS_TX_COLLISION        0x0248
 143 #define CPMAC_STATS_TX_SINGLECOLL       0x024c
 144 #define CPMAC_STATS_TX_MULTICOLL        0x0250
 145 #define CPMAC_STATS_TX_EXCESSCOLL       0x0254
 146 #define CPMAC_STATS_TX_LATECOLL         0x0258
 147 #define CPMAC_STATS_TX_UNDERRUN         0x025c
 148 #define CPMAC_STATS_TX_CARRIERSENSE     0x0260
 149 #define CPMAC_STATS_TX_OCTETS           0x0264
 150
 151 #define cpmac_read(base, reg)           (readl((void __iomem *)(base) + (reg)))
 152 #define cpmac_write(base, reg, val)     (writel(val, (void __iomem *)(base) + \
 153                                                 (reg)))
 154
 155 /* MDIO bus */
 156 #define CPMAC_MDIO_VERSION              0x0000
 157 #define CPMAC_MDIO_CONTROL              0x0004
 158 # define MDIOC_IDLE                     0x80000000
 159 # define MDIOC_ENABLE                   0x40000000
 160 # define MDIOC_PREAMBLE                 0x00100000
 161 # define MDIOC_FAULT                    0x00080000
 162 # define MDIOC_FAULTDETECT              0x00040000
 163 # define MDIOC_INTTEST                  0x00020000
 164 # define MDIOC_CLKDIV(div)              ((div) & 0xff)
 165 #define CPMAC_MDIO_ALIVE                0x0008
 166 #define CPMAC_MDIO_LINK                 0x000c
 167 #define CPMAC_MDIO_ACCESS(channel)      (0x0080 + (channel) * 8)
 168 # define MDIO_BUSY                      0x80000000
 169 # define MDIO_WRITE                     0x40000000
 170 # define MDIO_REG(reg)                  (((reg) & 0x1f) << 21)
 171 # define MDIO_PHY(phy)                  (((phy) & 0x1f) << 16)
 172 # define MDIO_DATA(data)                ((data) & 0xffff)
 173 #define CPMAC_MDIO_PHYSEL(channel)      (0x0084 + (channel) * 8)
 174 # define PHYSEL_LINKSEL                 0x00000040
 175 # define PHYSEL_LINKINT                 0x00000020
 176
 177 struct cpmac_desc {
 178         u32 hw_next;
 179         u32 hw_data;
 180         u16 buflen;
 181         u16 bufflags;
 182         u16 datalen;
 183         u16 dataflags;
 184 #define CPMAC_SOP                       0x8000
 185 #define CPMAC_EOP                       0x4000
 186 #define CPMAC_OWN                       0x2000
 187 #define CPMAC_EOQ                       0x1000
 188         struct sk_buff *skb;
 189         struct cpmac_desc *next;
 190         struct cpmac_desc *prev;
 191         dma_addr_t mapping;
 192         dma_addr_t data_mapping;
 193 };
 194
 195 struct cpmac_priv {
 196         spinlock_t lock;
 197         spinlock_t rx_lock;
 198         struct cpmac_desc *rx_head;
 199         int ring_size;
 200         struct cpmac_desc *desc_ring;
 201         dma_addr_t dma_ring;
 202         void __iomem *regs;
 203         struct mii_bus *mii_bus;
 204         struct phy_device *phy;
 205         char phy_name[BUS_ID_SIZE];
 206         int oldlink, oldspeed, oldduplex;
 207         u32 msg_enable;
 208         struct net_device *dev;
 209         struct work_struct reset_work;
 210         struct platform_device *pdev;
 211         struct napi_struct napi;
 212         atomic_t reset_pending;
 213 };
 214
 215 static irqreturn_t cpmac_irq(int, void *);
 216 static void cpmac_hw_start(struct net_device *dev);
 217 static void cpmac_hw_stop(struct net_device *dev);
 218 static int cpmac_stop(struct net_device *dev);
 219 static int cpmac_open(struct net_device *dev);
 220
 221 static void cpmac_dump_regs(struct net_device *dev)
 222 {
 223         int i;
 224         struct cpmac_priv *priv = netdev_priv(dev);
 225         for (i = 0; i < CPMAC_REG_END; i += 4) {
 226                 if (i % 16 == 0) {
 227                         if (i)
 228                                 printk("\n");
 229                         printk(KERN_DEBUG "%s: reg[%p]:", dev->name,
 230                                priv->regs + i);
 231                 }
 232                 printk(" %08x", cpmac_read(priv->regs, i));
 233         }
 234         printk("\n");
 235 }
 236
 237 static void cpmac_dump_desc(struct net_device *dev, struct cpmac_desc *desc)
 238 {
 239         int i;
 240         printk(KERN_DEBUG "%s: desc[%p]:", dev->name, desc);
 241         for (i = 0; i < sizeof(*desc) / 4; i++)
 242                 printk(" %08x", ((u32 *)desc)[i]);
 243         printk("\n");
 244 }
 245
 246 static void cpmac_dump_all_desc(struct net_device *dev)
 247 {
 248         struct cpmac_priv *priv = netdev_priv(dev);
 249         struct cpmac_desc *dump = priv->rx_head;
 250         do {
 251                 cpmac_dump_desc(dev, dump);
 252                 dump = dump->next;
 253         } while (dump != priv->rx_head);
 254 }
 255
 256 static void cpmac_dump_skb(struct net_device *dev, struct sk_buff *skb)
 257 {
 258         int i;
 259         printk(KERN_DEBUG "%s: skb 0x%p, len=%d\n", dev->name, skb, skb->len);
 260         for (i = 0; i < skb->len; i++) {
 261                 if (i % 16 == 0) {
 262                         if (i)
 263                                 printk("\n");
 264                         printk(KERN_DEBUG "%s: data[%p]:", dev->name,
 265                                skb->data + i);
 266                 }
 267                 printk(" %02x", ((u8 *)skb->data)[i]);
 268         }
 269         printk("\n");
 270 }
 271
 272 static int cpmac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
 273 {
 274         u32 val;
 275
 276         while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
 277                 cpu_relax();
 278         cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_REG(reg) |
 279                     MDIO_PHY(phy_id));
 280         while ((val = cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0))) & MDIO_BUSY)
 281                 cpu_relax();
 282         return MDIO_DATA(val);
 283 }
 284
 285 static int cpmac_mdio_write(struct mii_bus *bus, int phy_id,
 286                             int reg, u16 val)
 287 {
 288         while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
 289                 cpu_relax();
 290         cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_WRITE |
 291                     MDIO_REG(reg) | MDIO_PHY(phy_id) | MDIO_DATA(val));
 292         return 0;
 293 }
 294
 295 static int cpmac_mdio_reset(struct mii_bus *bus)
 296 {
 297         ar7_device_reset(AR7_RESET_BIT_MDIO);
 298         cpmac_write(bus->priv, CPMAC_MDIO_CONTROL, MDIOC_ENABLE |
 299                     MDIOC_CLKDIV(ar7_cpmac_freq() / 2200000 - 1));
 300         return 0;
 301 }
 302
 303 static int mii_irqs[PHY_MAX_ADDR] = { PHY_POLL, };
 304
 305 static struct mii_bus *cpmac_mii;
 306
 307 static int cpmac_config(struct net_device *dev, struct ifmap *map)
 308 {
 309         if (dev->flags & IFF_UP)
 310                 return -EBUSY;
 311
 312         /* Don't allow changing the I/O address */
 313         if (map->base_addr != dev->base_addr)
 314                 return -EOPNOTSUPP;
 315
 316         /* ignore other fields */
 317         return 0;
 318 }
 319
 320 static void cpmac_set_multicast_list(struct net_device *dev)
 321 {
 322         struct dev_mc_list *iter;
 323         int i;
 324         u8 tmp;
 325         u32 mbp, bit, hash[2] = { 0, };
 326         struct cpmac_priv *priv = netdev_priv(dev);
 327
 328         mbp = cpmac_read(priv->regs, CPMAC_MBP);
 329         if (dev->flags & IFF_PROMISC) {
 330                 cpmac_write(priv->regs, CPMAC_MBP, (mbp & ~MBP_PROMISCCHAN(0)) |
 331                             MBP_RXPROMISC);
 332         } else {
 333                 cpmac_write(priv->regs, CPMAC_MBP, mbp & ~MBP_RXPROMISC);
 334                 if (dev->flags & IFF_ALLMULTI) {
 335                         /* enable all multicast mode */
 336                         cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, 0xffffffff);
 337                         cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, 0xffffffff);
 338                 } else {
 339                         /*
 340                          * cpmac uses some strange mac address hashing
 341                          * (not crc32)
 342                          */
 343                         for (i = 0, iter = dev->mc_list; i < dev->mc_count;
 344                              i++, iter = iter->next) {
 345                                 bit = 0;
 346                                 tmp = iter->dmi_addr[0];
 347                                 bit  ^= (tmp >> 2) ^ (tmp << 4);
 348                                 tmp = iter->dmi_addr[1];
 349                                 bit  ^= (tmp >> 4) ^ (tmp << 2);
 350                                 tmp = iter->dmi_addr[2];
 351                                 bit  ^= (tmp >> 6) ^ tmp;
 352                                 tmp = iter->dmi_addr[3];
 353                                 bit  ^= (tmp >> 2) ^ (tmp << 4);
 354                                 tmp = iter->dmi_addr[4];
 355                                 bit  ^= (tmp >> 4) ^ (tmp << 2);
 356                                 tmp = iter->dmi_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                         printk(KERN_WARNING "%s: rx: spurious interrupt\n",
 379                                priv->dev->name);
 380                 return NULL;
 381         }
 382
 383         skb = netdev_alloc_skb(priv->dev, CPMAC_SKB_SIZE);
 384         if (likely(skb)) {
 385                 skb_reserve(skb, 2);
 386                 skb_put(desc->skb, desc->datalen);
 387                 desc->skb->protocol = eth_type_trans(desc->skb, priv->dev);
 388                 desc->skb->ip_summed = CHECKSUM_NONE;
 389                 priv->dev->stats.rx_packets++;
 390                 priv->dev->stats.rx_bytes += desc->datalen;
 391                 result = desc->skb;
 392                 dma_unmap_single(&priv->dev->dev, desc->data_mapping,
 393                                  CPMAC_SKB_SIZE, DMA_FROM_DEVICE);
 394                 desc->skb = skb;
 395                 desc->data_mapping = dma_map_single(&priv->dev->dev, skb->data,
 396                                                     CPMAC_SKB_SIZE,
 397                                                     DMA_FROM_DEVICE);
 398                 desc->hw_data = (u32)desc->data_mapping;
 399                 if (unlikely(netif_msg_pktdata(priv))) {
 400                         printk(KERN_DEBUG "%s: received packet:\n",
 401                                priv->dev->name);
 402                         cpmac_dump_skb(priv->dev, result);
 403                 }
 404         } else {
 405                 if (netif_msg_rx_err(priv) && net_ratelimit())
 406                         printk(KERN_WARNING
 407                                "%s: low on skbs, dropping packet\n",
 408                                priv->dev->name);
 409                 priv->dev->stats.rx_dropped++;
 410         }
 411
 412         desc->buflen = CPMAC_SKB_SIZE;
 413         desc->dataflags = CPMAC_OWN;
 414
 415         return result;
 416 }
 417
 418 static int cpmac_poll(struct napi_struct *napi, int budget)
 419 {
 420         struct sk_buff *skb;
 421         struct cpmac_desc *desc, *restart;
 422         struct cpmac_priv *priv = container_of(napi, struct cpmac_priv, napi);
 423         int received = 0, processed = 0;
 424
 425         spin_lock(&priv->rx_lock);
 426         if (unlikely(!priv->rx_head)) {
 427                 if (netif_msg_rx_err(priv) && net_ratelimit())
 428                         printk(KERN_WARNING "%s: rx: polling, but no queue\n",
 429                                priv->dev->name);
 430                 spin_unlock(&priv->rx_lock);
 431                 netif_rx_complete(priv->dev, napi);
 432                 return 0;
 433         }
 434
 435         desc = priv->rx_head;
 436         restart = NULL;
 437         while (((desc->dataflags & CPMAC_OWN) == 0) && (received < budget)) {
 438                 processed++;
 439
 440                 if ((desc->dataflags & CPMAC_EOQ) != 0) {
 441                         /* The last update to eoq->hw_next didn't happen
 442                         * soon enough, and the receiver stopped here.
 443                         *Remember this descriptor so we can restart
 444                         * the receiver after freeing some space.
 445                         */
 446                         if (unlikely(restart)) {
 447                                 if (netif_msg_rx_err(priv))
 448                                         printk(KERN_ERR "%s: poll found a"
 449                                                 " duplicate EOQ: %p and %p\n",
 450                                                 priv->dev->name, restart, desc);
 451                                 goto fatal_error;
 452                         }
 453
 454                         restart = desc->next;
 455                 }
 456
 457                 skb = cpmac_rx_one(priv, desc);
 458                 if (likely(skb)) {
 459                         netif_receive_skb(skb);
 460                         received++;
 461                 }
 462                 desc = desc->next;
 463         }
 464
 465         if (desc != priv->rx_head) {
 466                 /* We freed some buffers, but not the whole ring,
 467                  * add what we did free to the rx list */
 468                 desc->prev->hw_next = (u32)0;
 469                 priv->rx_head->prev->hw_next = priv->rx_head->mapping;
 470         }
 471
 472         /* Optimization: If we did not actually process an EOQ (perhaps because
 473          * of quota limits), check to see if the tail of the queue has EOQ set.
 474         * We should immediately restart in that case so that the receiver can
 475         * restart and run in parallel with more packet processing.
 476         * This lets us handle slightly larger bursts before running
 477         * out of ring space (assuming dev->weight < ring_size) */
 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                         printk(KERN_WARNING "%s: rx dma ring overrun\n",
 495                                priv->dev->name);
 496
 497                 if (unlikely((restart->dataflags & CPMAC_OWN) == 0)) {
 498                         if (netif_msg_drv(priv))
 499                                 printk(KERN_ERR "%s: cpmac_poll is trying to "
 500                                         "restart rx from a descriptor that's "
 501                                         "not free: %p\n",
 502                                         priv->dev->name, restart);
 503                                 goto fatal_error;
 504                 }
 505
 506                 cpmac_write(priv->regs, CPMAC_RX_PTR(0), restart->mapping);
 507         }
 508
 509         priv->rx_head = desc;
 510         spin_unlock(&priv->rx_lock);
 511         if (unlikely(netif_msg_rx_status(priv)))
 512                 printk(KERN_DEBUG "%s: poll processed %d packets\n",
 513                        priv->dev->name, received);
 514         if (processed == 0) {
 515                 /* we ran out of packets to read,
 516                  * revert to interrupt-driven mode */
 517                 netif_rx_complete(priv->dev, napi);
 518                 cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
 519                 return 0;
 520         }
 521
 522         return 1;
 523
 524 fatal_error:
 525         /* Something went horribly wrong.
 526          * Reset hardware to try to recover rather than wedging. */
 527
 528         if (netif_msg_drv(priv)) {
 529                 printk(KERN_ERR "%s: cpmac_poll is confused. "
 530                                 "Resetting hardware\n", priv->dev->name);
 531                 cpmac_dump_all_desc(priv->dev);
 532                 printk(KERN_DEBUG "%s: RX_PTR(0)=0x%08x RX_ACK(0)=0x%08x\n",
 533                         priv->dev->name,
 534                         cpmac_read(priv->regs, CPMAC_RX_PTR(0)),
 535                         cpmac_read(priv->regs, CPMAC_RX_ACK(0)));
 536         }
 537
 538         spin_unlock(&priv->rx_lock);
 539         netif_rx_complete(priv->dev, napi);
 540         netif_tx_stop_all_queues(priv->dev);
 541         napi_disable(&priv->napi);
 542
 543         atomic_inc(&priv->reset_pending);
 544         cpmac_hw_stop(priv->dev);
 545         if (!schedule_work(&priv->reset_work))
 546                 atomic_dec(&priv->reset_pending);
 547         return 0;
 548
 549 }
 550
 551 static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
 552 {
 553         int queue, len;
 554         struct cpmac_desc *desc;
 555         struct cpmac_priv *priv = netdev_priv(dev);
 556
 557         if (unlikely(atomic_read(&priv->reset_pending)))
 558                 return NETDEV_TX_BUSY;
 559
 560         if (unlikely(skb_padto(skb, ETH_ZLEN)))
 561                 return NETDEV_TX_OK;
 562
 563         len = max(skb->len, ETH_ZLEN);
 564         queue = skb_get_queue_mapping(skb);
 565         netif_stop_subqueue(dev, queue);
 566
 567         desc = &priv->desc_ring[queue];
 568         if (unlikely(desc->dataflags & CPMAC_OWN)) {
 569                 if (netif_msg_tx_err(priv) && net_ratelimit())
 570                         printk(KERN_WARNING "%s: tx dma ring full\n",
 571                                dev->name);
 572                 return NETDEV_TX_BUSY;
 573         }
 574
 575         spin_lock(&priv->lock);
 576         dev->trans_start = jiffies;
 577         spin_unlock(&priv->lock);
 578         desc->dataflags = CPMAC_SOP | CPMAC_EOP | CPMAC_OWN;
 579         desc->skb = skb;
 580         desc->data_mapping = dma_map_single(&dev->dev, skb->data, len,
 581                                             DMA_TO_DEVICE);
 582         desc->hw_data = (u32)desc->data_mapping;
 583         desc->datalen = len;
 584         desc->buflen = len;
 585         if (unlikely(netif_msg_tx_queued(priv)))
 586                 printk(KERN_DEBUG "%s: sending 0x%p, len=%d\n", dev->name, skb,
 587                        skb->len);
 588         if (unlikely(netif_msg_hw(priv)))
 589                 cpmac_dump_desc(dev, desc);
 590         if (unlikely(netif_msg_pktdata(priv)))
 591                 cpmac_dump_skb(dev, skb);
 592         cpmac_write(priv->regs, CPMAC_TX_PTR(queue), (u32)desc->mapping);
 593
 594         return NETDEV_TX_OK;
 595 }
 596
 597 static void cpmac_end_xmit(struct net_device *dev, int queue)
 598 {
 599         struct cpmac_desc *desc;
 600         struct cpmac_priv *priv = netdev_priv(dev);
 601
 602         desc = &priv->desc_ring[queue];
 603         cpmac_write(priv->regs, CPMAC_TX_ACK(queue), (u32)desc->mapping);
 604         if (likely(desc->skb)) {
 605                 spin_lock(&priv->lock);
 606                 dev->stats.tx_packets++;
 607                 dev->stats.tx_bytes += desc->skb->len;
 608                 spin_unlock(&priv->lock);
 609                 dma_unmap_single(&dev->dev, desc->data_mapping, desc->skb->len,
 610                                  DMA_TO_DEVICE);
 611
 612                 if (unlikely(netif_msg_tx_done(priv)))
 613                         printk(KERN_DEBUG "%s: sent 0x%p, len=%d\n", dev->name,
 614                                desc->skb, desc->skb->len);
 615
 616                 dev_kfree_skb_irq(desc->skb);
 617                 desc->skb = NULL;
 618                 if (netif_subqueue_stopped(dev, queue))
 619                         netif_wake_subqueue(dev, queue);
 620         } else {
 621                 if (netif_msg_tx_err(priv) && net_ratelimit())
 622                         printk(KERN_WARNING
 623                                "%s: end_xmit: spurious interrupt\n", dev->name);
 624                 if (netif_subqueue_stopped(dev, queue))
 625                         netif_wake_subqueue(dev, queue);
 626         }
 627 }
 628
 629 static void cpmac_hw_stop(struct net_device *dev)
 630 {
 631         int i;
 632         struct cpmac_priv *priv = netdev_priv(dev);
 633         struct plat_cpmac_data *pdata = priv->pdev->dev.platform_data;
 634
 635         ar7_device_reset(pdata->reset_bit);
 636         cpmac_write(priv->regs, CPMAC_RX_CONTROL,
 637                     cpmac_read(priv->regs, CPMAC_RX_CONTROL) & ~1);
 638         cpmac_write(priv->regs, CPMAC_TX_CONTROL,
 639                     cpmac_read(priv->regs, CPMAC_TX_CONTROL) & ~1);
 640         for (i = 0; i < 8; i++) {
 641                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
 642                 cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
 643         }
 644         cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
 645         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
 646         cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
 647         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 648         cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
 649                     cpmac_read(priv->regs, CPMAC_MAC_CONTROL) & ~MAC_MII);
 650 }
 651
 652 static void cpmac_hw_start(struct net_device *dev)
 653 {
 654         int i;
 655         struct cpmac_priv *priv = netdev_priv(dev);
 656         struct plat_cpmac_data *pdata = priv->pdev->dev.platform_data;
 657
 658         ar7_device_reset(pdata->reset_bit);
 659         for (i = 0; i < 8; i++) {
 660                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
 661                 cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
 662         }
 663         cpmac_write(priv->regs, CPMAC_RX_PTR(0), priv->rx_head->mapping);
 664
 665         cpmac_write(priv->regs, CPMAC_MBP, MBP_RXSHORT | MBP_RXBCAST |
 666                     MBP_RXMCAST);
 667         cpmac_write(priv->regs, CPMAC_BUFFER_OFFSET, 0);
 668         for (i = 0; i < 8; i++)
 669                 cpmac_write(priv->regs, CPMAC_MAC_ADDR_LO(i), dev->dev_addr[5]);
 670         cpmac_write(priv->regs, CPMAC_MAC_ADDR_MID, dev->dev_addr[4]);
 671         cpmac_write(priv->regs, CPMAC_MAC_ADDR_HI, dev->dev_addr[0] |
 672                     (dev->dev_addr[1] << 8) | (dev->dev_addr[2] << 16) |
 673                     (dev->dev_addr[3] << 24));
 674         cpmac_write(priv->regs, CPMAC_MAX_LENGTH, CPMAC_SKB_SIZE);
 675         cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
 676         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
 677         cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
 678         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 679         cpmac_write(priv->regs, CPMAC_UNICAST_ENABLE, 1);
 680         cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
 681         cpmac_write(priv->regs, CPMAC_TX_INT_ENABLE, 0xff);
 682         cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
 683
 684         cpmac_write(priv->regs, CPMAC_RX_CONTROL,
 685                     cpmac_read(priv->regs, CPMAC_RX_CONTROL) | 1);
 686         cpmac_write(priv->regs, CPMAC_TX_CONTROL,
 687                     cpmac_read(priv->regs, CPMAC_TX_CONTROL) | 1);
 688         cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
 689                     cpmac_read(priv->regs, CPMAC_MAC_CONTROL) | MAC_MII |
 690                     MAC_FDX);
 691 }
 692
 693 static void cpmac_clear_rx(struct net_device *dev)
 694 {
 695         struct cpmac_priv *priv = netdev_priv(dev);
 696         struct cpmac_desc *desc;
 697         int i;
 698         if (unlikely(!priv->rx_head))
 699                 return;
 700         desc = priv->rx_head;
 701         for (i = 0; i < priv->ring_size; i++) {
 702                 if ((desc->dataflags & CPMAC_OWN) == 0) {
 703                         if (netif_msg_rx_err(priv) && net_ratelimit())
 704                                 printk(KERN_WARNING "%s: packet dropped\n",
 705                                        dev->name);
 706                         if (unlikely(netif_msg_hw(priv)))
 707                                 cpmac_dump_desc(dev, desc);
 708                         desc->dataflags = CPMAC_OWN;
 709                         dev->stats.rx_dropped++;
 710                 }
 711                 desc->hw_next = desc->next->mapping;
 712                 desc = desc->next;
 713         }
 714         priv->rx_head->prev->hw_next = 0;
 715 }
 716
 717 static void cpmac_clear_tx(struct net_device *dev)
 718 {
 719         struct cpmac_priv *priv = netdev_priv(dev);
 720         int i;
 721         if (unlikely(!priv->desc_ring))
 722                 return;
 723         for (i = 0; i < CPMAC_QUEUES; i++) {
 724                 priv->desc_ring[i].dataflags = 0;
 725                 if (priv->desc_ring[i].skb) {
 726                         dev_kfree_skb_any(priv->desc_ring[i].skb);
 727                         priv->desc_ring[i].skb = NULL;
 728                 }
 729         }
 730 }
 731
 732 static void cpmac_hw_error(struct work_struct *work)
 733 {
 734         int i;
 735         struct cpmac_priv *priv =
 736                 container_of(work, struct cpmac_priv, reset_work);
 737
 738         spin_lock(&priv->rx_lock);
 739         cpmac_clear_rx(priv->dev);
 740         spin_unlock(&priv->rx_lock);
 741         cpmac_clear_tx(priv->dev);
 742         cpmac_hw_start(priv->dev);
 743         barrier();
 744         atomic_dec(&priv->reset_pending);
 745
 746         netif_tx_wake_all_queues(priv->dev);
 747         cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
 748 }
 749
 750 static void cpmac_check_status(struct net_device *dev)
 751 {
 752         struct cpmac_priv *priv = netdev_priv(dev);
 753
 754         u32 macstatus = cpmac_read(priv->regs, CPMAC_MAC_STATUS);
 755         int rx_channel = (macstatus >> 8) & 7;
 756         int rx_code = (macstatus >> 12) & 15;
 757         int tx_channel = (macstatus >> 16) & 7;
 758         int tx_code = (macstatus >> 20) & 15;
 759
 760         if (rx_code || tx_code) {
 761                 if (netif_msg_drv(priv) && net_ratelimit()) {
 762                         /* Can't find any documentation on what these
 763                          *error codes actually are. So just log them and hope..
 764                          */
 765                         if (rx_code)
 766                                 printk(KERN_WARNING "%s: host error %d on rx "
 767                                      "channel %d (macstatus %08x), resetting\n",
 768                                      dev->name, rx_code, rx_channel, macstatus);
 769                         if (tx_code)
 770                                 printk(KERN_WARNING "%s: host error %d on tx "
 771                                      "channel %d (macstatus %08x), resetting\n",
 772                                      dev->name, tx_code, tx_channel, macstatus);
 773                 }
 774
 775                 netif_tx_stop_all_queues(dev);
 776                 cpmac_hw_stop(dev);
 777                 if (schedule_work(&priv->reset_work))
 778                         atomic_inc(&priv->reset_pending);
 779                 if (unlikely(netif_msg_hw(priv)))
 780                         cpmac_dump_regs(dev);
 781         }
 782         cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
 783 }
 784
 785 static irqreturn_t cpmac_irq(int irq, void *dev_id)
 786 {
 787         struct net_device *dev = dev_id;
 788         struct cpmac_priv *priv;
 789         int queue;
 790         u32 status;
 791
 792         priv = netdev_priv(dev);
 793
 794         status = cpmac_read(priv->regs, CPMAC_MAC_INT_VECTOR);
 795
 796         if (unlikely(netif_msg_intr(priv)))
 797                 printk(KERN_DEBUG "%s: interrupt status: 0x%08x\n", dev->name,
 798                        status);
 799
 800         if (status & MAC_INT_TX)
 801                 cpmac_end_xmit(dev, (status & 7));
 802
 803         if (status & MAC_INT_RX) {
 804                 queue = (status >> 8) & 7;
 805                 if (netif_rx_schedule_prep(dev, &priv->napi)) {
 806                         cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 1 << queue);
 807                         __netif_rx_schedule(dev, &priv->napi);
 808                 }
 809         }
 810
 811         cpmac_write(priv->regs, CPMAC_MAC_EOI_VECTOR, 0);
 812
 813         if (unlikely(status & (MAC_INT_HOST | MAC_INT_STATUS)))
 814                 cpmac_check_status(dev);
 815
 816         return IRQ_HANDLED;
 817 }
 818
 819 static void cpmac_tx_timeout(struct net_device *dev)
 820 {
 821         int i;
 822         struct cpmac_priv *priv = netdev_priv(dev);
 823
 824         spin_lock(&priv->lock);
 825         dev->stats.tx_errors++;
 826         spin_unlock(&priv->lock);
 827         if (netif_msg_tx_err(priv) && net_ratelimit())
 828                 printk(KERN_WARNING "%s: transmit timeout\n", dev->name);
 829
 830         atomic_inc(&priv->reset_pending);
 831         barrier();
 832         cpmac_clear_tx(dev);
 833         barrier();
 834         atomic_dec(&priv->reset_pending);
 835
 836         netif_tx_wake_all_queues(priv->dev);
 837 }
 838
 839 static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 840 {
 841         struct cpmac_priv *priv = netdev_priv(dev);
 842         if (!(netif_running(dev)))
 843                 return -EINVAL;
 844         if (!priv->phy)
 845                 return -EINVAL;
 846         if ((cmd == SIOCGMIIPHY) || (cmd == SIOCGMIIREG) ||
 847             (cmd == SIOCSMIIREG))
 848                 return phy_mii_ioctl(priv->phy, if_mii(ifr), cmd);
 849
 850         return -EOPNOTSUPP;
 851 }
 852
 853 static int cpmac_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 854 {
 855         struct cpmac_priv *priv = netdev_priv(dev);
 856
 857         if (priv->phy)
 858                 return phy_ethtool_gset(priv->phy, cmd);
 859
 860         return -EINVAL;
 861 }
 862
 863 static int cpmac_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 864 {
 865         struct cpmac_priv *priv = netdev_priv(dev);
 866
 867         if (!capable(CAP_NET_ADMIN))
 868                 return -EPERM;
 869
 870         if (priv->phy)
 871                 return phy_ethtool_sset(priv->phy, cmd);
 872
 873         return -EINVAL;
 874 }
 875
 876 static void cpmac_get_ringparam(struct net_device *dev, struct ethtool_ringparam* ring)
 877 {
 878         struct cpmac_priv *priv = netdev_priv(dev);
 879
 880         ring->rx_max_pending = 1024;
 881         ring->rx_mini_max_pending = 1;
 882         ring->rx_jumbo_max_pending = 1;
 883         ring->tx_max_pending = 1;
 884
 885         ring->rx_pending = priv->ring_size;
 886         ring->rx_mini_pending = 1;
 887         ring->rx_jumbo_pending = 1;
 888         ring->tx_pending = 1;
 889 }
 890
 891 static int cpmac_set_ringparam(struct net_device *dev, struct ethtool_ringparam* ring)
 892 {
 893         struct cpmac_priv *priv = netdev_priv(dev);
 894
 895         if (netif_running(dev))
 896                 return -EBUSY;
 897         priv->ring_size = ring->rx_pending;
 898         return 0;
 899 }
 900
 901 static void cpmac_get_drvinfo(struct net_device *dev,
 902                               struct ethtool_drvinfo *info)
 903 {
 904         strcpy(info->driver, "cpmac");
 905         strcpy(info->version, CPMAC_VERSION);
 906         info->fw_version[0] = '\0';
 907         sprintf(info->bus_info, "%s", "cpmac");
 908         info->regdump_len = 0;
 909 }
 910
 911 static const struct ethtool_ops cpmac_ethtool_ops = {
 912         .get_settings = cpmac_get_settings,
 913         .set_settings = cpmac_set_settings,
 914         .get_drvinfo = cpmac_get_drvinfo,
 915         .get_link = ethtool_op_get_link,
 916         .get_ringparam = cpmac_get_ringparam,
 917         .set_ringparam = cpmac_set_ringparam,
 918 };
 919
 920 static void cpmac_adjust_link(struct net_device *dev)
 921 {
 922         struct cpmac_priv *priv = netdev_priv(dev);
 923         int new_state = 0;
 924
 925         spin_lock(&priv->lock);
 926         if (priv->phy->link) {
 927                 netif_tx_start_all_queues(dev);
 928                 if (priv->phy->duplex != priv->oldduplex) {
 929                         new_state = 1;
 930                         priv->oldduplex = priv->phy->duplex;
 931                 }
 932
 933                 if (priv->phy->speed != priv->oldspeed) {
 934                         new_state = 1;
 935                         priv->oldspeed = priv->phy->speed;
 936                 }
 937
 938                 if (!priv->oldlink) {
 939                         new_state = 1;
 940                         priv->oldlink = 1;
 941                 }
 942         } else if (priv->oldlink) {
 943                 new_state = 1;
 944                 priv->oldlink = 0;
 945                 priv->oldspeed = 0;
 946                 priv->oldduplex = -1;
 947         }
 948
 949         if (new_state && netif_msg_link(priv) && net_ratelimit())
 950                 phy_print_status(priv->phy);
 951
 952         spin_unlock(&priv->lock);
 953 }
 954
 955 static int cpmac_open(struct net_device *dev)
 956 {
 957         int i, size, res;
 958         struct cpmac_priv *priv = netdev_priv(dev);
 959         struct resource *mem;
 960         struct cpmac_desc *desc;
 961         struct sk_buff *skb;
 962
 963         mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
 964         if (!request_mem_region(mem->start, mem->end - mem->start, dev->name)) {
 965                 if (netif_msg_drv(priv))
 966                         printk(KERN_ERR "%s: failed to request registers\n",
 967                                dev->name);
 968                 res = -ENXIO;
 969                 goto fail_reserve;
 970         }
 971
 972         priv->regs = ioremap(mem->start, mem->end - mem->start);
 973         if (!priv->regs) {
 974                 if (netif_msg_drv(priv))
 975                         printk(KERN_ERR "%s: failed to remap registers\n",
 976                                dev->name);
 977                 res = -ENXIO;
 978                 goto fail_remap;
 979         }
 980
 981         size = priv->ring_size + CPMAC_QUEUES;
 982         priv->desc_ring = dma_alloc_coherent(&dev->dev,
 983                                              sizeof(struct cpmac_desc) * size,
 984                                              &priv->dma_ring,
 985                                              GFP_KERNEL);
 986         if (!priv->desc_ring) {
 987                 res = -ENOMEM;
 988                 goto fail_alloc;
 989         }
 990
 991         for (i = 0; i < size; i++)
 992                 priv->desc_ring[i].mapping = priv->dma_ring + sizeof(*desc) * i;
 993
 994         priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
 995         for (i = 0, desc = priv->rx_head; i < priv->ring_size; i++, desc++) {
 996                 skb = netdev_alloc_skb(dev, CPMAC_SKB_SIZE);
 997                 if (unlikely(!skb)) {
 998                         res = -ENOMEM;
 999                         goto fail_desc;
1000                 }
1001                 skb_reserve(skb, 2);
1002                 desc->skb = skb;
1003                 desc->data_mapping = dma_map_single(&dev->dev, skb->data,
1004                                                     CPMAC_SKB_SIZE,
1005                                                     DMA_FROM_DEVICE);
1006                 desc->hw_data = (u32)desc->data_mapping;
1007                 desc->buflen = CPMAC_SKB_SIZE;
1008                 desc->dataflags = CPMAC_OWN;
1009                 desc->next = &priv->rx_head[(i + 1) % priv->ring_size];
1010                 desc->next->prev = desc;
1011                 desc->hw_next = (u32)desc->next->mapping;
1012         }
1013
1014         priv->rx_head->prev->hw_next = (u32)0;
1015
1016         if ((res = request_irq(dev->irq, cpmac_irq, IRQF_SHARED,
1017                                dev->name, dev))) {
1018                 if (netif_msg_drv(priv))
1019                         printk(KERN_ERR "%s: failed to obtain irq\n",
1020                                dev->name);
1021                 goto fail_irq;
1022         }
1023
1024         atomic_set(&priv->reset_pending, 0);
1025         INIT_WORK(&priv->reset_work, cpmac_hw_error);
1026         cpmac_hw_start(dev);
1027
1028         napi_enable(&priv->napi);
1029         priv->phy->state = PHY_CHANGELINK;
1030         phy_start(priv->phy);
1031
1032         return 0;
1033
1034 fail_irq:
1035 fail_desc:
1036         for (i = 0; i < priv->ring_size; i++) {
1037                 if (priv->rx_head[i].skb) {
1038                         dma_unmap_single(&dev->dev,
1039                                          priv->rx_head[i].data_mapping,
1040                                          CPMAC_SKB_SIZE,
1041                                          DMA_FROM_DEVICE);
1042                         kfree_skb(priv->rx_head[i].skb);
1043                 }
1044         }
1045 fail_alloc:
1046         kfree(priv->desc_ring);
1047         iounmap(priv->regs);
1048
1049 fail_remap:
1050         release_mem_region(mem->start, mem->end - mem->start);
1051
1052 fail_reserve:
1053         return res;
1054 }
1055
1056 static int cpmac_stop(struct net_device *dev)
1057 {
1058         int i;
1059         struct cpmac_priv *priv = netdev_priv(dev);
1060         struct resource *mem;
1061
1062         netif_tx_stop_all_queues(dev);
1063
1064         cancel_work_sync(&priv->reset_work);
1065         napi_disable(&priv->napi);
1066         phy_stop(priv->phy);
1067
1068         cpmac_hw_stop(dev);
1069
1070         for (i = 0; i < 8; i++)
1071                 cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
1072         cpmac_write(priv->regs, CPMAC_RX_PTR(0), 0);
1073         cpmac_write(priv->regs, CPMAC_MBP, 0);
1074
1075         free_irq(dev->irq, dev);
1076         iounmap(priv->regs);
1077         mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
1078         release_mem_region(mem->start, mem->end - mem->start);
1079         priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
1080         for (i = 0; i < priv->ring_size; i++) {
1081                 if (priv->rx_head[i].skb) {
1082                         dma_unmap_single(&dev->dev,
1083                                          priv->rx_head[i].data_mapping,
1084                                          CPMAC_SKB_SIZE,
1085                                          DMA_FROM_DEVICE);
1086                         kfree_skb(priv->rx_head[i].skb);
1087                 }
1088         }
1089
1090         dma_free_coherent(&dev->dev, sizeof(struct cpmac_desc) *
1091                           (CPMAC_QUEUES + priv->ring_size),
1092                           priv->desc_ring, priv->dma_ring);
1093         return 0;
1094 }
1095
1096 static int external_switch;
1097
1098 static int __devinit cpmac_probe(struct platform_device *pdev)
1099 {
1100         int rc, phy_id, i;
1101         char *mdio_bus_id = "0";
1102         struct resource *mem;
1103         struct cpmac_priv *priv;
1104         struct net_device *dev;
1105         struct plat_cpmac_data *pdata;
1106         DECLARE_MAC_BUF(mac);
1107
1108         pdata = pdev->dev.platform_data;
1109
1110         for (phy_id = 0; phy_id < PHY_MAX_ADDR; phy_id++) {
1111                 if (!(pdata->phy_mask & (1 << phy_id)))
1112                         continue;
1113                 if (!cpmac_mii->phy_map[phy_id])
1114                         continue;
1115                 break;
1116         }
1117
1118         if (phy_id == PHY_MAX_ADDR) {
1119                 if (external_switch || dumb_switch) {
1120                         mdio_bus_id = 0; /* fixed phys bus */
1121                         phy_id = pdev->id;
1122                 } else {
1123                         dev_err(&pdev->dev, "no PHY present\n");
1124                         return -ENODEV;
1125                 }
1126         }
1127
1128         dev = alloc_etherdev_mq(sizeof(*priv), CPMAC_QUEUES);
1129
1130         if (!dev) {
1131                 printk(KERN_ERR "cpmac: Unable to allocate net_device\n");
1132                 return -ENOMEM;
1133         }
1134
1135         platform_set_drvdata(pdev, dev);
1136         priv = netdev_priv(dev);
1137
1138         priv->pdev = pdev;
1139         mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
1140         if (!mem) {
1141                 rc = -ENODEV;
1142                 goto fail;
1143         }
1144
1145         dev->irq = platform_get_irq_byname(pdev, "irq");
1146
1147         dev->open               = cpmac_open;
1148         dev->stop               = cpmac_stop;
1149         dev->set_config         = cpmac_config;
1150         dev->hard_start_xmit    = cpmac_start_xmit;
1151         dev->do_ioctl           = cpmac_ioctl;
1152         dev->set_multicast_list = cpmac_set_multicast_list;
1153         dev->tx_timeout         = cpmac_tx_timeout;
1154         dev->ethtool_ops        = &cpmac_ethtool_ops;
1155
1156         netif_napi_add(dev, &priv->napi, cpmac_poll, 64);
1157
1158         spin_lock_init(&priv->lock);
1159         spin_lock_init(&priv->rx_lock);
1160         priv->dev = dev;
1161         priv->ring_size = 64;
1162         priv->msg_enable = netif_msg_init(debug_level, 0xff);
1163         memcpy(dev->dev_addr, pdata->dev_addr, sizeof(dev->dev_addr));
1164
1165         priv->phy = phy_connect(dev, cpmac_mii->phy_map[phy_id]->dev.bus_id,
1166                                 &cpmac_adjust_link, 0, PHY_INTERFACE_MODE_MII);
1167         if (IS_ERR(priv->phy)) {
1168                 if (netif_msg_drv(priv))
1169                         printk(KERN_ERR "%s: Could not attach to PHY\n",
1170                                dev->name);
1171                 return PTR_ERR(priv->phy);
1172         }
1173
1174         if ((rc = register_netdev(dev))) {
1175                 printk(KERN_ERR "cpmac: error %i registering device %s\n", rc,
1176                        dev->name);
1177                 goto fail;
1178         }
1179
1180         if (netif_msg_probe(priv)) {
1181                 printk(KERN_INFO
1182                        "cpmac: device %s (regs: %p, irq: %d, phy: %s, "
1183                        "mac: %s)\n", dev->name, (void *)mem->start, dev->irq,
1184                        priv->phy_name, print_mac(mac, dev->dev_addr));
1185         }
1186         return 0;
1187
1188 fail:
1189         free_netdev(dev);
1190         return rc;
1191 }
1192
1193 static int __devexit cpmac_remove(struct platform_device *pdev)
1194 {
1195         struct net_device *dev = platform_get_drvdata(pdev);
1196         unregister_netdev(dev);
1197         free_netdev(dev);
1198         return 0;
1199 }
1200
1201 static struct platform_driver cpmac_driver = {
1202         .driver.name = "cpmac",
1203         .driver.owner = THIS_MODULE,
1204         .probe = cpmac_probe,
1205         .remove = __devexit_p(cpmac_remove),
1206 };
1207
1208 int __devinit cpmac_init(void)
1209 {
1210         u32 mask;
1211         int i, res;
1212
1213         cpmac_mii = mdiobus_alloc();
1214         if (cpmac_mii == NULL)
1215                 return -ENOMEM;
1216
1217         cpmac_mii->name = "cpmac-mii";
1218         cpmac_mii->read = cpmac_mdio_read;
1219         cpmac_mii->write = cpmac_mdio_write;
1220         cpmac_mii->reset = cpmac_mdio_reset;
1221         cpmac_mii->irq = mii_irqs;
1222
1223         cpmac_mii->priv = ioremap(AR7_REGS_MDIO, 256);
1224
1225         if (!cpmac_mii->priv) {
1226                 printk(KERN_ERR "Can't ioremap mdio registers\n");
1227                 res = -ENXIO;
1228                 goto fail_alloc;
1229         }
1230
1231 #warning FIXME: unhardcode gpio&reset bits
1232         ar7_gpio_disable(26);
1233         ar7_gpio_disable(27);
1234         ar7_device_reset(AR7_RESET_BIT_CPMAC_LO);
1235         ar7_device_reset(AR7_RESET_BIT_CPMAC_HI);
1236         ar7_device_reset(AR7_RESET_BIT_EPHY);
1237
1238         cpmac_mii->reset(cpmac_mii);
1239
1240         for (i = 0; i < 300000; i++)
1241                 if ((mask = cpmac_read(cpmac_mii->priv, CPMAC_MDIO_ALIVE)))
1242                         break;
1243                 else
1244                         cpu_relax();
1245
1246         mask &= 0x7fffffff;
1247         if (mask & (mask - 1)) {
1248                 external_switch = 1;
1249                 mask = 0;
1250         }
1251
1252         cpmac_mii->phy_mask = ~(mask | 0x80000000);
1253         snprintf(cpmac_mii->id, MII_BUS_ID_SIZE, "0");
1254
1255         res = mdiobus_register(cpmac_mii);
1256         if (res)
1257                 goto fail_mii;
1258
1259         res = platform_driver_register(&cpmac_driver);
1260         if (res)
1261                 goto fail_cpmac;
1262
1263         return 0;
1264
1265 fail_cpmac:
1266         mdiobus_unregister(cpmac_mii);
1267
1268 fail_mii:
1269         iounmap(cpmac_mii->priv);
1270
1271 fail_alloc:
1272         mdiobus_free(cpmac_mii);
1273
1274         return res;
1275 }
1276
1277 void __devexit cpmac_exit(void)
1278 {
1279         platform_driver_unregister(&cpmac_driver);
1280         mdiobus_unregister(cpmac_mii);
1281         mdiobus_free(cpmac_mii);
1282         iounmap(cpmac_mii->priv);
1283 }
1284
1285 module_init(cpmac_init);
1286 module_exit(cpmac_exit);