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         mmiowb();
 145         data = w5300_read_direct(priv, W5300_IDM_DR);
 146         spin_unlock_irqrestore(&priv->reg_lock, flags);
 147
 148         return data;
 149 }
 150
 151 static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
 152 {
 153         unsigned long flags;
 154
 155         spin_lock_irqsave(&priv->reg_lock, flags);
 156         w5300_write_direct(priv, W5300_IDM_AR, addr);
 157         mmiowb();
 158         w5300_write_direct(priv, W5300_IDM_DR, data);
 159         mmiowb();
 160         spin_unlock_irqrestore(&priv->reg_lock, flags);
 161 }
 162
 163 #if defined(CONFIG_WIZNET_BUS_DIRECT)
 164 #define w5300_read      w5300_read_direct
 165 #define w5300_write     w5300_write_direct
 166
 167 #elif defined(CONFIG_WIZNET_BUS_INDIRECT)
 168 #define w5300_read      w5300_read_indirect
 169 #define w5300_write     w5300_write_indirect
 170
 171 #else /* CONFIG_WIZNET_BUS_ANY */
 172 #define w5300_read      priv->read
 173 #define w5300_write     priv->write
 174 #endif
 175
 176 static u32 w5300_read32(struct w5300_priv *priv, u16 addr)
 177 {
 178         u32 data;
 179         data  = w5300_read(priv, addr) << 16;
 180         data |= w5300_read(priv, addr + 2);
 181         return data;
 182 }
 183
 184 static void w5300_write32(struct w5300_priv *priv, u16 addr, u32 data)
 185 {
 186         w5300_write(priv, addr, data >> 16);
 187         w5300_write(priv, addr + 2, data);
 188 }
 189
 190 static int w5300_command(struct w5300_priv *priv, u16 cmd)
 191 {
 192         unsigned long timeout = jiffies + msecs_to_jiffies(100);
 193
 194         w5300_write(priv, W5300_S0_CR, cmd);
 195         mmiowb();
 196
 197         while (w5300_read(priv, W5300_S0_CR) != 0) {
 198                 if (time_after(jiffies, timeout))
 199                         return -EIO;
 200                 cpu_relax();
 201         }
 202
 203         return 0;
 204 }
 205
 206 static void w5300_read_frame(struct w5300_priv *priv, u8 *buf, int len)
 207 {
 208         u16 fifo;
 209         int i;
 210
 211         for (i = 0; i < len; i += 2) {
 212                 fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 213                 *buf++ = fifo >> 8;
 214                 *buf++ = fifo;
 215         }
 216         fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 217         fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 218 }
 219
 220 static void w5300_write_frame(struct w5300_priv *priv, u8 *buf, int len)
 221 {
 222         u16 fifo;
 223         int i;
 224
 225         for (i = 0; i < len; i += 2) {
 226                 fifo  = *buf++ << 8;
 227                 fifo |= *buf++;
 228                 w5300_write(priv, W5300_S0_TX_FIFO, fifo);
 229         }
 230         w5300_write32(priv, W5300_S0_TX_WRSR, len);
 231 }
 232
 233 static void w5300_write_macaddr(struct w5300_priv *priv)
 234 {
 235         struct net_device *ndev = priv->ndev;
 236         w5300_write32(priv, W5300_SHARL,
 237                       ndev->dev_addr[0] << 24 |
 238                       ndev->dev_addr[1] << 16 |
 239                       ndev->dev_addr[2] << 8 |
 240                       ndev->dev_addr[3]);
 241         w5300_write(priv, W5300_SHARH,
 242                       ndev->dev_addr[4] << 8 |
 243                       ndev->dev_addr[5]);
 244         mmiowb();
 245 }
 246
 247 static void w5300_hw_reset(struct w5300_priv *priv)
 248 {
 249         w5300_write_direct(priv, W5300_MR, MR_RST);
 250         mmiowb();
 251         mdelay(5);
 252         w5300_write_direct(priv, W5300_MR, priv->indirect ?
 253                                  MR_WDF(7) | MR_PB | MR_IND :
 254                                  MR_WDF(7) | MR_PB);
 255         mmiowb();
 256         w5300_write(priv, W5300_IMR, 0);
 257         w5300_write_macaddr(priv);
 258
 259         /* Configure 128K of internal memory
 260          * as 64K RX fifo and 64K TX fifo
 261          */
 262         w5300_write32(priv, W5300_RMSRL, 64 << 24);
 263         w5300_write32(priv, W5300_RMSRH, 0);
 264         w5300_write32(priv, W5300_TMSRL, 64 << 24);
 265         w5300_write32(priv, W5300_TMSRH, 0);
 266         w5300_write(priv, W5300_MTYPE, 0x00ff);
 267         mmiowb();
 268 }
 269
 270 static void w5300_hw_start(struct w5300_priv *priv)
 271 {
 272         w5300_write(priv, W5300_S0_MR, priv->promisc ?
 273                           S0_MR_MACRAW : S0_MR_MACRAW_MF);
 274         mmiowb();
 275         w5300_command(priv, S0_CR_OPEN);
 276         w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
 277         w5300_write(priv, W5300_IMR, IR_S0);
 278         mmiowb();
 279 }
 280
 281 static void w5300_hw_close(struct w5300_priv *priv)
 282 {
 283         w5300_write(priv, W5300_IMR, 0);
 284         mmiowb();
 285         w5300_command(priv, S0_CR_CLOSE);
 286 }
 287
 288 /***********************************************************************
 289  *
 290  *   Device driver functions / callbacks
 291  *
 292  ***********************************************************************/
 293
 294 static void w5300_get_drvinfo(struct net_device *ndev,
 295                               struct ethtool_drvinfo *info)
 296 {
 297         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 298         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 299         strlcpy(info->bus_info, dev_name(ndev->dev.parent),
 300                 sizeof(info->bus_info));
 301 }
 302
 303 static u32 w5300_get_link(struct net_device *ndev)
 304 {
 305         struct w5300_priv *priv = netdev_priv(ndev);
 306
 307         if (gpio_is_valid(priv->link_gpio))
 308                 return !!gpio_get_value(priv->link_gpio);
 309
 310         return 1;
 311 }
 312
 313 static u32 w5300_get_msglevel(struct net_device *ndev)
 314 {
 315         struct w5300_priv *priv = netdev_priv(ndev);
 316
 317         return priv->msg_enable;
 318 }
 319
 320 static void w5300_set_msglevel(struct net_device *ndev, u32 value)
 321 {
 322         struct w5300_priv *priv = netdev_priv(ndev);
 323
 324         priv->msg_enable = value;
 325 }
 326
 327 static int w5300_get_regs_len(struct net_device *ndev)
 328 {
 329         return W5300_REGS_LEN;
 330 }
 331
 332 static void w5300_get_regs(struct net_device *ndev,
 333                            struct ethtool_regs *regs, void *_buf)
 334 {
 335         struct w5300_priv *priv = netdev_priv(ndev);
 336         u8 *buf = _buf;
 337         u16 addr;
 338         u16 data;
 339
 340         regs->version = 1;
 341         for (addr = 0; addr < W5300_REGS_LEN; addr += 2) {
 342                 switch (addr & 0x23f) {
 343                 case W5300_S0_TX_FIFO: /* cannot read TX_FIFO */
 344                 case W5300_S0_RX_FIFO: /* cannot read RX_FIFO */
 345                         data = 0xffff;
 346                         break;
 347                 default:
 348                         data = w5300_read(priv, addr);
 349                         break;
 350                 }
 351                 *buf++ = data >> 8;
 352                 *buf++ = data;
 353         }
 354 }
 355
 356 static void w5300_tx_timeout(struct net_device *ndev)
 357 {
 358         struct w5300_priv *priv = netdev_priv(ndev);
 359
 360         netif_stop_queue(ndev);
 361         w5300_hw_reset(priv);
 362         w5300_hw_start(priv);
 363         ndev->stats.tx_errors++;
 364         netif_trans_update(ndev);
 365         netif_wake_queue(ndev);
 366 }
 367
 368 static int w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
 369 {
 370         struct w5300_priv *priv = netdev_priv(ndev);
 371
 372         netif_stop_queue(ndev);
 373
 374         w5300_write_frame(priv, skb->data, skb->len);
 375         mmiowb();
 376         ndev->stats.tx_packets++;
 377         ndev->stats.tx_bytes += skb->len;
 378         dev_kfree_skb(skb);
 379         netif_dbg(priv, tx_queued, ndev, "tx queued\n");
 380
 381         w5300_command(priv, S0_CR_SEND);
 382
 383         return NETDEV_TX_OK;
 384 }
 385
 386 static int w5300_napi_poll(struct napi_struct *napi, int budget)
 387 {
 388         struct w5300_priv *priv = container_of(napi, struct w5300_priv, napi);
 389         struct net_device *ndev = priv->ndev;
 390         struct sk_buff *skb;
 391         int rx_count;
 392         u16 rx_len;
 393
 394         for (rx_count = 0; rx_count < budget; rx_count++) {
 395                 u32 rx_fifo_len = w5300_read32(priv, W5300_S0_RX_RSR);
 396                 if (rx_fifo_len == 0)
 397                         break;
 398
 399                 rx_len = w5300_read(priv, W5300_S0_RX_FIFO);
 400
 401                 skb = netdev_alloc_skb_ip_align(ndev, roundup(rx_len, 2));
 402                 if (unlikely(!skb)) {
 403                         u32 i;
 404                         for (i = 0; i < rx_fifo_len; i += 2)
 405                                 w5300_read(priv, W5300_S0_RX_FIFO);
 406                         ndev->stats.rx_dropped++;
 407                         return -ENOMEM;
 408                 }
 409
 410                 skb_put(skb, rx_len);
 411                 w5300_read_frame(priv, skb->data, rx_len);
 412                 skb->protocol = eth_type_trans(skb, ndev);
 413
 414                 netif_receive_skb(skb);
 415                 ndev->stats.rx_packets++;
 416                 ndev->stats.rx_bytes += rx_len;
 417         }
 418
 419         if (rx_count < budget) {
 420                 napi_complete(napi);
 421                 w5300_write(priv, W5300_IMR, IR_S0);
 422                 mmiowb();
 423         }
 424
 425         return rx_count;
 426 }
 427
 428 static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
 429 {
 430         struct net_device *ndev = ndev_instance;
 431         struct w5300_priv *priv = netdev_priv(ndev);
 432
 433         int ir = w5300_read(priv, W5300_S0_IR);
 434         if (!ir)
 435                 return IRQ_NONE;
 436         w5300_write(priv, W5300_S0_IR, ir);
 437         mmiowb();
 438
 439         if (ir & S0_IR_SENDOK) {
 440                 netif_dbg(priv, tx_done, ndev, "tx done\n");
 441                 netif_wake_queue(ndev);
 442         }
 443
 444         if (ir & S0_IR_RECV) {
 445                 if (napi_schedule_prep(&priv->napi)) {
 446                         w5300_write(priv, W5300_IMR, 0);
 447                         mmiowb();
 448                         __napi_schedule(&priv->napi);
 449                 }
 450         }
 451
 452         return IRQ_HANDLED;
 453 }
 454
 455 static irqreturn_t w5300_detect_link(int irq, void *ndev_instance)
 456 {
 457         struct net_device *ndev = ndev_instance;
 458         struct w5300_priv *priv = netdev_priv(ndev);
 459
 460         if (netif_running(ndev)) {
 461                 if (gpio_get_value(priv->link_gpio) != 0) {
 462                         netif_info(priv, link, ndev, "link is up\n");
 463                         netif_carrier_on(ndev);
 464                 } else {
 465                         netif_info(priv, link, ndev, "link is down\n");
 466                         netif_carrier_off(ndev);
 467                 }
 468         }
 469
 470         return IRQ_HANDLED;
 471 }
 472
 473 static void w5300_set_rx_mode(struct net_device *ndev)
 474 {
 475         struct w5300_priv *priv = netdev_priv(ndev);
 476         bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;
 477
 478         if (priv->promisc != set_promisc) {
 479                 priv->promisc = set_promisc;
 480                 w5300_hw_start(priv);
 481         }
 482 }
 483
 484 static int w5300_set_macaddr(struct net_device *ndev, void *addr)
 485 {
 486         struct w5300_priv *priv = netdev_priv(ndev);
 487         struct sockaddr *sock_addr = addr;
 488
 489         if (!is_valid_ether_addr(sock_addr->sa_data))
 490                 return -EADDRNOTAVAIL;
 491         memcpy(ndev->dev_addr, sock_addr->sa_data, ETH_ALEN);
 492         w5300_write_macaddr(priv);
 493         return 0;
 494 }
 495
 496 static int w5300_open(struct net_device *ndev)
 497 {
 498         struct w5300_priv *priv = netdev_priv(ndev);
 499
 500         netif_info(priv, ifup, ndev, "enabling\n");
 501         w5300_hw_start(priv);
 502         napi_enable(&priv->napi);
 503         netif_start_queue(ndev);
 504         if (!gpio_is_valid(priv->link_gpio) ||
 505             gpio_get_value(priv->link_gpio) != 0)
 506                 netif_carrier_on(ndev);
 507         return 0;
 508 }
 509
 510 static int w5300_stop(struct net_device *ndev)
 511 {
 512         struct w5300_priv *priv = netdev_priv(ndev);
 513
 514         netif_info(priv, ifdown, ndev, "shutting down\n");
 515         w5300_hw_close(priv);
 516         netif_carrier_off(ndev);
 517         netif_stop_queue(ndev);
 518         napi_disable(&priv->napi);
 519         return 0;
 520 }
 521
 522 static const struct ethtool_ops w5300_ethtool_ops = {
 523         .get_drvinfo            = w5300_get_drvinfo,
 524         .get_msglevel           = w5300_get_msglevel,
 525         .set_msglevel           = w5300_set_msglevel,
 526         .get_link               = w5300_get_link,
 527         .get_regs_len           = w5300_get_regs_len,
 528         .get_regs               = w5300_get_regs,
 529 };
 530
 531 static const struct net_device_ops w5300_netdev_ops = {
 532         .ndo_open               = w5300_open,
 533         .ndo_stop               = w5300_stop,
 534         .ndo_start_xmit         = w5300_start_tx,
 535         .ndo_tx_timeout         = w5300_tx_timeout,
 536         .ndo_set_rx_mode        = w5300_set_rx_mode,
 537         .ndo_set_mac_address    = w5300_set_macaddr,
 538         .ndo_validate_addr      = eth_validate_addr,
 539         .ndo_change_mtu         = eth_change_mtu,
 540 };
 541
 542 static int w5300_hw_probe(struct platform_device *pdev)
 543 {
 544         struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
 545         struct net_device *ndev = platform_get_drvdata(pdev);
 546         struct w5300_priv *priv = netdev_priv(ndev);
 547         const char *name = netdev_name(ndev);
 548         struct resource *mem;
 549         int mem_size;
 550         int irq;
 551         int ret;
 552
 553         if (data && is_valid_ether_addr(data->mac_addr)) {
 554                 memcpy(ndev->dev_addr, data->mac_addr, ETH_ALEN);
 555         } else {
 556                 eth_hw_addr_random(ndev);
 557         }
 558
 559         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 560         priv->base = devm_ioremap_resource(&pdev->dev, mem);
 561         if (IS_ERR(priv->base))
 562                 return PTR_ERR(priv->base);
 563
 564         mem_size = resource_size(mem);
 565
 566         spin_lock_init(&priv->reg_lock);
 567         priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
 568         if (priv->indirect) {
 569                 priv->read  = w5300_read_indirect;
 570                 priv->write = w5300_write_indirect;
 571         } else {
 572                 priv->read  = w5300_read_direct;
 573                 priv->write = w5300_write_direct;
 574         }
 575
 576         w5300_hw_reset(priv);
 577         if (w5300_read(priv, W5300_IDR) != IDR_W5300)
 578                 return -ENODEV;
 579
 580         irq = platform_get_irq(pdev, 0);
 581         if (irq < 0)
 582                 return irq;
 583         ret = request_irq(irq, w5300_interrupt,
 584                           IRQ_TYPE_LEVEL_LOW, name, ndev);
 585         if (ret < 0)
 586                 return ret;
 587         priv->irq = irq;
 588
 589         priv->link_gpio = data ? data->link_gpio : -EINVAL;
 590         if (gpio_is_valid(priv->link_gpio)) {
 591                 char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
 592                 if (!link_name)
 593                         return -ENOMEM;
 594                 snprintf(link_name, 16, "%s-link", name);
 595                 priv->link_irq = gpio_to_irq(priv->link_gpio);
 596                 if (request_any_context_irq(priv->link_irq, w5300_detect_link,
 597                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 598                                 link_name, priv->ndev) < 0)
 599                         priv->link_gpio = -EINVAL;
 600         }
 601
 602         netdev_info(ndev, "at 0x%llx irq %d\n", (u64)mem->start, irq);
 603         return 0;
 604 }
 605
 606 static int w5300_probe(struct platform_device *pdev)
 607 {
 608         struct w5300_priv *priv;
 609         struct net_device *ndev;
 610         int err;
 611
 612         ndev = alloc_etherdev(sizeof(*priv));
 613         if (!ndev)
 614                 return -ENOMEM;
 615         SET_NETDEV_DEV(ndev, &pdev->dev);
 616         platform_set_drvdata(pdev, ndev);
 617         priv = netdev_priv(ndev);
 618         priv->ndev = ndev;
 619
 620         ndev->netdev_ops = &w5300_netdev_ops;
 621         ndev->ethtool_ops = &w5300_ethtool_ops;
 622         ndev->watchdog_timeo = HZ;
 623         netif_napi_add(ndev, &priv->napi, w5300_napi_poll, 16);
 624
 625         /* This chip doesn't support VLAN packets with normal MTU,
 626          * so disable VLAN for this device.
 627          */
 628         ndev->features |= NETIF_F_VLAN_CHALLENGED;
 629
 630         err = register_netdev(ndev);
 631         if (err < 0)
 632                 goto err_register;
 633
 634         err = w5300_hw_probe(pdev);
 635         if (err < 0)
 636                 goto err_hw_probe;
 637
 638         return 0;
 639
 640 err_hw_probe:
 641         unregister_netdev(ndev);
 642 err_register:
 643         free_netdev(ndev);
 644         return err;
 645 }
 646
 647 static int w5300_remove(struct platform_device *pdev)
 648 {
 649         struct net_device *ndev = platform_get_drvdata(pdev);
 650         struct w5300_priv *priv = netdev_priv(ndev);
 651
 652         w5300_hw_reset(priv);
 653         free_irq(priv->irq, ndev);
 654         if (gpio_is_valid(priv->link_gpio))
 655                 free_irq(priv->link_irq, ndev);
 656
 657         unregister_netdev(ndev);
 658         free_netdev(ndev);
 659         return 0;
 660 }
 661
 662 #ifdef CONFIG_PM_SLEEP
 663 static int w5300_suspend(struct device *dev)
 664 {
 665         struct platform_device *pdev = to_platform_device(dev);
 666         struct net_device *ndev = platform_get_drvdata(pdev);
 667         struct w5300_priv *priv = netdev_priv(ndev);
 668
 669         if (netif_running(ndev)) {
 670                 netif_carrier_off(ndev);
 671                 netif_device_detach(ndev);
 672
 673                 w5300_hw_close(priv);
 674         }
 675         return 0;
 676 }
 677
 678 static int w5300_resume(struct device *dev)
 679 {
 680         struct platform_device *pdev = to_platform_device(dev);
 681         struct net_device *ndev = platform_get_drvdata(pdev);
 682         struct w5300_priv *priv = netdev_priv(ndev);
 683
 684         if (!netif_running(ndev)) {
 685                 w5300_hw_reset(priv);
 686                 w5300_hw_start(priv);
 687
 688                 netif_device_attach(ndev);
 689                 if (!gpio_is_valid(priv->link_gpio) ||
 690                     gpio_get_value(priv->link_gpio) != 0)
 691                         netif_carrier_on(ndev);
 692         }
 693         return 0;
 694 }
 695 #endif /* CONFIG_PM_SLEEP */
 696
 697 static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);
 698
 699 static struct platform_driver w5300_driver = {
 700         .driver         = {
 701                 .name   = DRV_NAME,
 702                 .pm     = &w5300_pm_ops,
 703         },
 704         .probe          = w5300_probe,
 705         .remove         = w5300_remove,
 706 };
 707
 708 module_platform_driver(w5300_driver);