drivers/net/ethernet/wiznet/w5300.c

   1 /*
   2  * Ethernet driver for the WIZnet W5300 chip.
   3  *
   4  * Copyright (C) 2008-2009 WIZnet Co.,Ltd.
   5  * Copyright (C) 2011 Taehun Kim <kth3321 <at> gmail.com>
   6  * Copyright (C) 2012 Mike Sinkovsky <msink@permonline.ru>
   7  *
   8  * Licensed under the GPL-2 or later.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/etherdevice.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/platform_data/wiznet.h>
  17 #include <linux/ethtool.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/types.h>
  20 #include <linux/errno.h>
  21 #include <linux/delay.h>
  22 #include <linux/slab.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/io.h>
  25 #include <linux/ioport.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/irq.h>
  28 #include <linux/gpio.h>
  29
  30 #define DRV_NAME        "w5300"
  31 #define DRV_VERSION     "2012-04-04"
  32
  33 MODULE_DESCRIPTION("WIZnet W5300 Ethernet driver v"DRV_VERSION);
  34 MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
  35 MODULE_ALIAS("platform:"DRV_NAME);
  36 MODULE_LICENSE("GPL");
  37
  38 /*
  39  * Registers
  40  */
  41 #define W5300_MR                0x0000  /* Mode Register */
  42 #define   MR_DBW                  (1 << 15) /* Data bus width */
  43 #define   MR_MPF                  (1 << 14) /* Mac layer pause frame */
  44 #define   MR_WDF(n)               (((n)&7)<<11) /* Write data fetch time */
  45 #define   MR_RDH                  (1 << 10) /* Read data hold time */
  46 #define   MR_FS                   (1 << 8)  /* FIFO swap */
  47 #define   MR_RST                  (1 << 7)  /* S/W reset */
  48 #define   MR_PB                   (1 << 4)  /* Ping block */
  49 #define   MR_DBS                  (1 << 2)  /* Data bus swap */
  50 #define   MR_IND                  (1 << 0)  /* Indirect mode */
  51 #define W5300_IR                0x0002  /* Interrupt Register */
  52 #define W5300_IMR               0x0004  /* Interrupt Mask Register */
  53 #define   IR_S0                   0x0001  /* S0 interrupt */
  54 #define W5300_SHARL             0x0008  /* Source MAC address (0123) */
  55 #define W5300_SHARH             0x000c  /* Source MAC address (45) */
  56 #define W5300_TMSRL             0x0020  /* Transmit Memory Size (0123) */
  57 #define W5300_TMSRH             0x0024  /* Transmit Memory Size (4567) */
  58 #define W5300_RMSRL             0x0028  /* Receive Memory Size (0123) */
  59 #define W5300_RMSRH             0x002c  /* Receive Memory Size (4567) */
  60 #define W5300_MTYPE             0x0030  /* Memory Type */
  61 #define W5300_IDR               0x00fe  /* Chip ID register */
  62 #define   IDR_W5300               0x5300  /* =0x5300 for WIZnet W5300 */
  63 #define W5300_S0_MR             0x0200  /* S0 Mode Register */
  64 #define   S0_MR_CLOSED            0x0000  /* Close mode */
  65 #define   S0_MR_MACRAW            0x0004  /* MAC RAW mode (promiscuous) */
  66 #define   S0_MR_MACRAW_MF         0x0044  /* MAC RAW mode (filtered) */
  67 #define W5300_S0_CR             0x0202  /* S0 Command Register */
  68 #define   S0_CR_OPEN              0x0001  /* OPEN command */
  69 #define   S0_CR_CLOSE             0x0010  /* CLOSE command */
  70 #define   S0_CR_SEND              0x0020  /* SEND command */
  71 #define   S0_CR_RECV              0x0040  /* RECV command */
  72 #define W5300_S0_IMR            0x0204  /* S0 Interrupt Mask Register */
  73 #define W5300_S0_IR             0x0206  /* S0 Interrupt Register */
  74 #define   S0_IR_RECV              0x0004  /* Receive interrupt */
  75 #define   S0_IR_SENDOK            0x0010  /* Send OK interrupt */
  76 #define W5300_S0_SSR            0x0208  /* S0 Socket Status Register */
  77 #define W5300_S0_TX_WRSR        0x0220  /* S0 TX Write Size Register */
  78 #define W5300_S0_TX_FSR         0x0224  /* S0 TX Free Size Register */
  79 #define W5300_S0_RX_RSR         0x0228  /* S0 Received data Size */
  80 #define W5300_S0_TX_FIFO        0x022e  /* S0 Transmit FIFO */
  81 #define W5300_S0_RX_FIFO        0x0230  /* S0 Receive FIFO */
  82 #define W5300_REGS_LEN          0x0400
  83
  84 /*
  85  * Device driver private data structure
  86  */
  87 struct w5300_priv {
  88         void __iomem *base;
  89         spinlock_t reg_lock;
  90         bool indirect;
  91         u16  (*read) (struct w5300_priv *priv, u16 addr);
  92         void (*write)(struct w5300_priv *priv, u16 addr, u16 data);
  93         int irq;
  94         int link_irq;
  95         int link_gpio;
  96
  97         struct napi_struct napi;
  98         struct net_device *ndev;
  99         bool promisc;
 100         u32 msg_enable;
 101 };
 102
 103 /************************************************************************
 104  *
 105  *  Lowlevel I/O functions
 106  *
 107  ***********************************************************************/
 108
 109 /*
 110  * In direct address mode host system can directly access W5300 registers
 111  * after mapping to Memory-Mapped I/O space.
 112  *
 113  * 0x400 bytes are required for memory space.
 114  */
 115 static inline u16 w5300_read_direct(struct w5300_priv *priv, u16 addr)
 116 {
 117         return ioread16(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
 118 }
 119
 120 static inline void w5300_write_direct(struct w5300_priv *priv,
 121                                       u16 addr, u16 data)
 122 {
 123         iowrite16(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
 124 }
 125
 126 /*
 127  * In indirect address mode host system indirectly accesses registers by
 128  * using Indirect Mode Address Register (IDM_AR) and Indirect Mode Data
 129  * Register (IDM_DR), which are directly mapped to Memory-Mapped I/O space.
 130  * Mode Register (MR) is directly accessible.
 131  *
 132  * Only 0x06 bytes are required for memory space.
 133  */
 134 #define W5300_IDM_AR            0x0002   /* Indirect Mode Address */
 135 #define W5300_IDM_DR            0x0004   /* Indirect Mode Data */
 136
 137 static u16 w5300_read_indirect(struct w5300_priv *priv, u16 addr)
 138 {
 139         unsigned long flags;
 140         u16 data;
 141
 142         spin_lock_irqsave(&priv->reg_lock, flags);
 143         w5300_write_direct(priv, W5300_IDM_AR, addr);
 144         data = w5300_read_direct(priv, W5300_IDM_DR);
 145         spin_unlock_irqrestore(&priv->reg_lock, flags);
 146
 147         return data;
 148 }
 149
 150 static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
 151 {
 152         unsigned long flags;
 153
 154         spin_lock_irqsave(&priv->reg_lock, flags);
 155         w5300_write_direct(priv, W5300_IDM_AR, addr);
 156         w5300_write_direct(priv, W5300_IDM_DR, data);
 157         spin_unlock_irqrestore(&priv->reg_lock, flags);
 158 }
 159
 160 #if defined(CONFIG_WIZNET_BUS_DIRECT)
 161 #define w5300_read      w5300_read_direct
 162 #define w5300_write     w5300_write_direct
 163
 164 #elif defined(CONFIG_WIZNET_BUS_INDIRECT)
 165 #define w5300_read      w5300_read_indirect
 166 #define w5300_write     w5300_write_indirect
 167
 168 #else /* CONFIG_WIZNET_BUS_ANY */
 169 #define w5300_read      priv->read
 170 #define w5300_write     priv->write
 171 #endif
 172
 173 static u32 w5300_read32(struct w5300_priv *priv, u16 addr)
 174 {
 175         u32 data;
 176         data  = w5300_read(priv, addr) << 16;
 177         data |= w5300_read(priv, addr + 2);
 178         return data;
 179 }
 180
 181 static void w5300_write32(struct w5300_priv *priv, u16 addr, u32 data)
 182 {
 183         w5300_write(priv, addr, data >> 16);
 184         w5300_write(priv, addr + 2, data);
 185 }
 186
 187 static int w5300_command(struct w5300_priv *priv, u16 cmd)
 188 {
 189         unsigned long timeout = jiffies + msecs_to_jiffies(100);
 190
 191         w5300_write(priv, W5300_S0_CR, cmd);
 192
 193         while (w5300_read(priv, W5300_S0_CR) != 0) {
 194                 if (time_after(jiffies, timeout))
 195                         return -EIO;
 196                 cpu_relax();
 197         }
 198
 199         return 0;
 200 }
 201
 202 static void w5300_read_frame(struct w5300_priv *priv, u8 *buf, int len)
 203 {
 204         u16 fifo;
 205         int i;
 206
 207         for (i = 0; i < len; i += 2) {
 208                 fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 209                 *buf++ = fifo >> 8;
 210                 *buf++ = fifo;
 211         }
 212         fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 213         fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 214 }
 215
 216 static void w5300_write_frame(struct w5300_priv *priv, u8 *buf, int len)
 217 {
 218         u16 fifo;
 219         int i;
 220
 221         for (i = 0; i < len; i += 2) {
 222                 fifo  = *buf++ << 8;
 223                 fifo |= *buf++;
 224                 w5300_write(priv, W5300_S0_TX_FIFO, fifo);
 225         }
 226         w5300_write32(priv, W5300_S0_TX_WRSR, len);
 227 }
 228
 229 static void w5300_write_macaddr(struct w5300_priv *priv)
 230 {
 231         struct net_device *ndev = priv->ndev;
 232         w5300_write32(priv, W5300_SHARL,
 233                       ndev->dev_addr[0] << 24 |
 234                       ndev->dev_addr[1] << 16 |
 235                       ndev->dev_addr[2] << 8 |
 236                       ndev->dev_addr[3]);
 237         w5300_write(priv, W5300_SHARH,
 238                       ndev->dev_addr[4] << 8 |
 239                       ndev->dev_addr[5]);
 240 }
 241
 242 static void w5300_hw_reset(struct w5300_priv *priv)
 243 {
 244         w5300_write_direct(priv, W5300_MR, MR_RST);
 245         mdelay(5);
 246         w5300_write_direct(priv, W5300_MR, priv->indirect ?
 247                                  MR_WDF(7) | MR_PB | MR_IND :
 248                                  MR_WDF(7) | MR_PB);
 249         w5300_write(priv, W5300_IMR, 0);
 250         w5300_write_macaddr(priv);
 251
 252         /* Configure 128K of internal memory
 253          * as 64K RX fifo and 64K TX fifo
 254          */
 255         w5300_write32(priv, W5300_RMSRL, 64 << 24);
 256         w5300_write32(priv, W5300_RMSRH, 0);
 257         w5300_write32(priv, W5300_TMSRL, 64 << 24);
 258         w5300_write32(priv, W5300_TMSRH, 0);
 259         w5300_write(priv, W5300_MTYPE, 0x00ff);
 260 }
 261
 262 static void w5300_hw_start(struct w5300_priv *priv)
 263 {
 264         w5300_write(priv, W5300_S0_MR, priv->promisc ?
 265                           S0_MR_MACRAW : S0_MR_MACRAW_MF);
 266         w5300_command(priv, S0_CR_OPEN);
 267         w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
 268         w5300_write(priv, W5300_IMR, IR_S0);
 269 }
 270
 271 static void w5300_hw_close(struct w5300_priv *priv)
 272 {
 273         w5300_write(priv, W5300_IMR, 0);
 274         w5300_command(priv, S0_CR_CLOSE);
 275 }
 276
 277 /***********************************************************************
 278  *
 279  *   Device driver functions / callbacks
 280  *
 281  ***********************************************************************/
 282
 283 static void w5300_get_drvinfo(struct net_device *ndev,
 284                               struct ethtool_drvinfo *info)
 285 {
 286         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 287         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 288         strlcpy(info->bus_info, dev_name(ndev->dev.parent),
 289                 sizeof(info->bus_info));
 290 }
 291
 292 static u32 w5300_get_link(struct net_device *ndev)
 293 {
 294         struct w5300_priv *priv = netdev_priv(ndev);
 295
 296         if (gpio_is_valid(priv->link_gpio))
 297                 return !!gpio_get_value(priv->link_gpio);
 298
 299         return 1;
 300 }
 301
 302 static u32 w5300_get_msglevel(struct net_device *ndev)
 303 {
 304         struct w5300_priv *priv = netdev_priv(ndev);
 305
 306         return priv->msg_enable;
 307 }
 308
 309 static void w5300_set_msglevel(struct net_device *ndev, u32 value)
 310 {
 311         struct w5300_priv *priv = netdev_priv(ndev);
 312
 313         priv->msg_enable = value;
 314 }
 315
 316 static int w5300_get_regs_len(struct net_device *ndev)
 317 {
 318         return W5300_REGS_LEN;
 319 }
 320
 321 static void w5300_get_regs(struct net_device *ndev,
 322                            struct ethtool_regs *regs, void *_buf)
 323 {
 324         struct w5300_priv *priv = netdev_priv(ndev);
 325         u8 *buf = _buf;
 326         u16 addr;
 327         u16 data;
 328
 329         regs->version = 1;
 330         for (addr = 0; addr < W5300_REGS_LEN; addr += 2) {
 331                 switch (addr & 0x23f) {
 332                 case W5300_S0_TX_FIFO: /* cannot read TX_FIFO */
 333                 case W5300_S0_RX_FIFO: /* cannot read RX_FIFO */
 334                         data = 0xffff;
 335                         break;
 336                 default:
 337                         data = w5300_read(priv, addr);
 338                         break;
 339                 }
 340                 *buf++ = data >> 8;
 341                 *buf++ = data;
 342         }
 343 }
 344
 345 static void w5300_tx_timeout(struct net_device *ndev)
 346 {
 347         struct w5300_priv *priv = netdev_priv(ndev);
 348
 349         netif_stop_queue(ndev);
 350         w5300_hw_reset(priv);
 351         w5300_hw_start(priv);
 352         ndev->stats.tx_errors++;
 353         netif_trans_update(ndev);
 354         netif_wake_queue(ndev);
 355 }
 356
 357 static netdev_tx_t w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
 358 {
 359         struct w5300_priv *priv = netdev_priv(ndev);
 360
 361         netif_stop_queue(ndev);
 362
 363         w5300_write_frame(priv, skb->data, skb->len);
 364         ndev->stats.tx_packets++;
 365         ndev->stats.tx_bytes += skb->len;
 366         dev_kfree_skb(skb);
 367         netif_dbg(priv, tx_queued, ndev, "tx queued\n");
 368
 369         w5300_command(priv, S0_CR_SEND);
 370
 371         return NETDEV_TX_OK;
 372 }
 373
 374 static int w5300_napi_poll(struct napi_struct *napi, int budget)
 375 {
 376         struct w5300_priv *priv = container_of(napi, struct w5300_priv, napi);
 377         struct net_device *ndev = priv->ndev;
 378         struct sk_buff *skb;
 379         int rx_count;
 380         u16 rx_len;
 381
 382         for (rx_count = 0; rx_count < budget; rx_count++) {
 383                 u32 rx_fifo_len = w5300_read32(priv, W5300_S0_RX_RSR);
 384                 if (rx_fifo_len == 0)
 385                         break;
 386
 387                 rx_len = w5300_read(priv, W5300_S0_RX_FIFO);
 388
 389                 skb = netdev_alloc_skb_ip_align(ndev, roundup(rx_len, 2));
 390                 if (unlikely(!skb)) {
 391                         u32 i;
 392                         for (i = 0; i < rx_fifo_len; i += 2)
 393                                 w5300_read(priv, W5300_S0_RX_FIFO);
 394                         ndev->stats.rx_dropped++;
 395                         return -ENOMEM;
 396                 }
 397
 398                 skb_put(skb, rx_len);
 399                 w5300_read_frame(priv, skb->data, rx_len);
 400                 skb->protocol = eth_type_trans(skb, ndev);
 401
 402                 netif_receive_skb(skb);
 403                 ndev->stats.rx_packets++;
 404                 ndev->stats.rx_bytes += rx_len;
 405         }
 406
 407         if (rx_count < budget) {
 408                 napi_complete_done(napi, rx_count);
 409                 w5300_write(priv, W5300_IMR, IR_S0);
 410         }
 411
 412         return rx_count;
 413 }
 414
 415 static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
 416 {
 417         struct net_device *ndev = ndev_instance;
 418         struct w5300_priv *priv = netdev_priv(ndev);
 419
 420         int ir = w5300_read(priv, W5300_S0_IR);
 421         if (!ir)
 422                 return IRQ_NONE;
 423         w5300_write(priv, W5300_S0_IR, ir);
 424
 425         if (ir & S0_IR_SENDOK) {
 426                 netif_dbg(priv, tx_done, ndev, "tx done\n");
 427                 netif_wake_queue(ndev);
 428         }
 429
 430         if (ir & S0_IR_RECV) {
 431                 if (napi_schedule_prep(&priv->napi)) {
 432                         w5300_write(priv, W5300_IMR, 0);
 433                         __napi_schedule(&priv->napi);
 434                 }
 435         }
 436
 437         return IRQ_HANDLED;
 438 }
 439
 440 static irqreturn_t w5300_detect_link(int irq, void *ndev_instance)
 441 {
 442         struct net_device *ndev = ndev_instance;
 443         struct w5300_priv *priv = netdev_priv(ndev);
 444
 445         if (netif_running(ndev)) {
 446                 if (gpio_get_value(priv->link_gpio) != 0) {
 447                         netif_info(priv, link, ndev, "link is up\n");
 448                         netif_carrier_on(ndev);
 449                 } else {
 450                         netif_info(priv, link, ndev, "link is down\n");
 451                         netif_carrier_off(ndev);
 452                 }
 453         }
 454
 455         return IRQ_HANDLED;
 456 }
 457
 458 static void w5300_set_rx_mode(struct net_device *ndev)
 459 {
 460         struct w5300_priv *priv = netdev_priv(ndev);
 461         bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;
 462
 463         if (priv->promisc != set_promisc) {
 464                 priv->promisc = set_promisc;
 465                 w5300_hw_start(priv);
 466         }
 467 }
 468
 469 static int w5300_set_macaddr(struct net_device *ndev, void *addr)
 470 {
 471         struct w5300_priv *priv = netdev_priv(ndev);
 472         struct sockaddr *sock_addr = addr;
 473
 474         if (!is_valid_ether_addr(sock_addr->sa_data))
 475                 return -EADDRNOTAVAIL;
 476         memcpy(ndev->dev_addr, sock_addr->sa_data, ETH_ALEN);
 477         w5300_write_macaddr(priv);
 478         return 0;
 479 }
 480
 481 static int w5300_open(struct net_device *ndev)
 482 {
 483         struct w5300_priv *priv = netdev_priv(ndev);
 484
 485         netif_info(priv, ifup, ndev, "enabling\n");
 486         w5300_hw_start(priv);
 487         napi_enable(&priv->napi);
 488         netif_start_queue(ndev);
 489         if (!gpio_is_valid(priv->link_gpio) ||
 490             gpio_get_value(priv->link_gpio) != 0)
 491                 netif_carrier_on(ndev);
 492         return 0;
 493 }
 494
 495 static int w5300_stop(struct net_device *ndev)
 496 {
 497         struct w5300_priv *priv = netdev_priv(ndev);
 498
 499         netif_info(priv, ifdown, ndev, "shutting down\n");
 500         w5300_hw_close(priv);
 501         netif_carrier_off(ndev);
 502         netif_stop_queue(ndev);
 503         napi_disable(&priv->napi);
 504         return 0;
 505 }
 506
 507 static const struct ethtool_ops w5300_ethtool_ops = {
 508         .get_drvinfo            = w5300_get_drvinfo,
 509         .get_msglevel           = w5300_get_msglevel,
 510         .set_msglevel           = w5300_set_msglevel,
 511         .get_link               = w5300_get_link,
 512         .get_regs_len           = w5300_get_regs_len,
 513         .get_regs               = w5300_get_regs,
 514 };
 515
 516 static const struct net_device_ops w5300_netdev_ops = {
 517         .ndo_open               = w5300_open,
 518         .ndo_stop               = w5300_stop,
 519         .ndo_start_xmit         = w5300_start_tx,
 520         .ndo_tx_timeout         = w5300_tx_timeout,
 521         .ndo_set_rx_mode        = w5300_set_rx_mode,
 522         .ndo_set_mac_address    = w5300_set_macaddr,
 523         .ndo_validate_addr      = eth_validate_addr,
 524 };
 525
 526 static int w5300_hw_probe(struct platform_device *pdev)
 527 {
 528         struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
 529         struct net_device *ndev = platform_get_drvdata(pdev);
 530         struct w5300_priv *priv = netdev_priv(ndev);
 531         const char *name = netdev_name(ndev);
 532         struct resource *mem;
 533         int mem_size;
 534         int irq;
 535         int ret;
 536
 537         if (data && is_valid_ether_addr(data->mac_addr)) {
 538                 memcpy(ndev->dev_addr, data->mac_addr, ETH_ALEN);
 539         } else {
 540                 eth_hw_addr_random(ndev);
 541         }
 542
 543         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 544         priv->base = devm_ioremap_resource(&pdev->dev, mem);
 545         if (IS_ERR(priv->base))
 546                 return PTR_ERR(priv->base);
 547
 548         mem_size = resource_size(mem);
 549
 550         spin_lock_init(&priv->reg_lock);
 551         priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
 552         if (priv->indirect) {
 553                 priv->read  = w5300_read_indirect;
 554                 priv->write = w5300_write_indirect;
 555         } else {
 556                 priv->read  = w5300_read_direct;
 557                 priv->write = w5300_write_direct;
 558         }
 559
 560         w5300_hw_reset(priv);
 561         if (w5300_read(priv, W5300_IDR) != IDR_W5300)
 562                 return -ENODEV;
 563
 564         irq = platform_get_irq(pdev, 0);
 565         if (irq < 0)
 566                 return irq;
 567         ret = request_irq(irq, w5300_interrupt,
 568                           IRQ_TYPE_LEVEL_LOW, name, ndev);
 569         if (ret < 0)
 570                 return ret;
 571         priv->irq = irq;
 572
 573         priv->link_gpio = data ? data->link_gpio : -EINVAL;
 574         if (gpio_is_valid(priv->link_gpio)) {
 575                 char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
 576                 if (!link_name)
 577                         return -ENOMEM;
 578                 snprintf(link_name, 16, "%s-link", name);
 579                 priv->link_irq = gpio_to_irq(priv->link_gpio);
 580                 if (request_any_context_irq(priv->link_irq, w5300_detect_link,
 581                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 582                                 link_name, priv->ndev) < 0)
 583                         priv->link_gpio = -EINVAL;
 584         }
 585
 586         netdev_info(ndev, "at 0x%llx irq %d\n", (u64)mem->start, irq);
 587         return 0;
 588 }
 589
 590 static int w5300_probe(struct platform_device *pdev)
 591 {
 592         struct w5300_priv *priv;
 593         struct net_device *ndev;
 594         int err;
 595
 596         ndev = alloc_etherdev(sizeof(*priv));
 597         if (!ndev)
 598                 return -ENOMEM;
 599         SET_NETDEV_DEV(ndev, &pdev->dev);
 600         platform_set_drvdata(pdev, ndev);
 601         priv = netdev_priv(ndev);
 602         priv->ndev = ndev;
 603
 604         ndev->netdev_ops = &w5300_netdev_ops;
 605         ndev->ethtool_ops = &w5300_ethtool_ops;
 606         ndev->watchdog_timeo = HZ;
 607         netif_napi_add(ndev, &priv->napi, w5300_napi_poll, 16);
 608
 609         /* This chip doesn't support VLAN packets with normal MTU,
 610          * so disable VLAN for this device.
 611          */
 612         ndev->features |= NETIF_F_VLAN_CHALLENGED;
 613
 614         err = register_netdev(ndev);
 615         if (err < 0)
 616                 goto err_register;
 617
 618         err = w5300_hw_probe(pdev);
 619         if (err < 0)
 620                 goto err_hw_probe;
 621
 622         return 0;
 623
 624 err_hw_probe:
 625         unregister_netdev(ndev);
 626 err_register:
 627         free_netdev(ndev);
 628         return err;
 629 }
 630
 631 static int w5300_remove(struct platform_device *pdev)
 632 {
 633         struct net_device *ndev = platform_get_drvdata(pdev);
 634         struct w5300_priv *priv = netdev_priv(ndev);
 635
 636         w5300_hw_reset(priv);
 637         free_irq(priv->irq, ndev);
 638         if (gpio_is_valid(priv->link_gpio))
 639                 free_irq(priv->link_irq, ndev);
 640
 641         unregister_netdev(ndev);
 642         free_netdev(ndev);
 643         return 0;
 644 }
 645
 646 #ifdef CONFIG_PM_SLEEP
 647 static int w5300_suspend(struct device *dev)
 648 {
 649         struct net_device *ndev = dev_get_drvdata(dev);
 650         struct w5300_priv *priv = netdev_priv(ndev);
 651
 652         if (netif_running(ndev)) {
 653                 netif_carrier_off(ndev);
 654                 netif_device_detach(ndev);
 655
 656                 w5300_hw_close(priv);
 657         }
 658         return 0;
 659 }
 660
 661 static int w5300_resume(struct device *dev)
 662 {
 663         struct net_device *ndev = dev_get_drvdata(dev);
 664         struct w5300_priv *priv = netdev_priv(ndev);
 665
 666         if (!netif_running(ndev)) {
 667                 w5300_hw_reset(priv);
 668                 w5300_hw_start(priv);
 669
 670                 netif_device_attach(ndev);
 671                 if (!gpio_is_valid(priv->link_gpio) ||
 672                     gpio_get_value(priv->link_gpio) != 0)
 673                         netif_carrier_on(ndev);
 674         }
 675         return 0;
 676 }
 677 #endif /* CONFIG_PM_SLEEP */
 678
 679 static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);
 680
 681 static struct platform_driver w5300_driver = {
 682         .driver         = {
 683                 .name   = DRV_NAME,
 684                 .pm     = &w5300_pm_ops,
 685         },
 686         .probe          = w5300_probe,
 687         .remove         = w5300_remove,
 688 };
 689
 690 module_platform_driver(w5300_driver);