drivers/net/ethernet/wiznet/w5300.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Ethernet driver for the WIZnet W5300 chip.
   4  *
   5  * Copyright (C) 2008-2009 WIZnet Co.,Ltd.
   6  * Copyright (C) 2011 Taehun Kim <kth3321 <at> gmail.com>
   7  * Copyright (C) 2012 Mike Sinkovsky <msink@permonline.ru>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/platform_data/wiznet.h>
  16 #include <linux/ethtool.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/delay.h>
  21 #include <linux/slab.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/io.h>
  24 #include <linux/ioport.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/irq.h>
  27 #include <linux/gpio.h>
  28
  29 #define DRV_NAME        "w5300"
  30 #define DRV_VERSION     "2012-04-04"
  31
  32 MODULE_DESCRIPTION("WIZnet W5300 Ethernet driver v"DRV_VERSION);
  33 MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
  34 MODULE_ALIAS("platform:"DRV_NAME);
  35 MODULE_LICENSE("GPL");
  36
  37 /*
  38  * Registers
  39  */
  40 #define W5300_MR                0x0000  /* Mode Register */
  41 #define   MR_DBW                  (1 << 15) /* Data bus width */
  42 #define   MR_MPF                  (1 << 14) /* Mac layer pause frame */
  43 #define   MR_WDF(n)               (((n)&7)<<11) /* Write data fetch time */
  44 #define   MR_RDH                  (1 << 10) /* Read data hold time */
  45 #define   MR_FS                   (1 << 8)  /* FIFO swap */
  46 #define   MR_RST                  (1 << 7)  /* S/W reset */
  47 #define   MR_PB                   (1 << 4)  /* Ping block */
  48 #define   MR_DBS                  (1 << 2)  /* Data bus swap */
  49 #define   MR_IND                  (1 << 0)  /* Indirect mode */
  50 #define W5300_IR                0x0002  /* Interrupt Register */
  51 #define W5300_IMR               0x0004  /* Interrupt Mask Register */
  52 #define   IR_S0                   0x0001  /* S0 interrupt */
  53 #define W5300_SHARL             0x0008  /* Source MAC address (0123) */
  54 #define W5300_SHARH             0x000c  /* Source MAC address (45) */
  55 #define W5300_TMSRL             0x0020  /* Transmit Memory Size (0123) */
  56 #define W5300_TMSRH             0x0024  /* Transmit Memory Size (4567) */
  57 #define W5300_RMSRL             0x0028  /* Receive Memory Size (0123) */
  58 #define W5300_RMSRH             0x002c  /* Receive Memory Size (4567) */
  59 #define W5300_MTYPE             0x0030  /* Memory Type */
  60 #define W5300_IDR               0x00fe  /* Chip ID register */
  61 #define   IDR_W5300               0x5300  /* =0x5300 for WIZnet W5300 */
  62 #define W5300_S0_MR             0x0200  /* S0 Mode Register */
  63 #define   S0_MR_CLOSED            0x0000  /* Close mode */
  64 #define   S0_MR_MACRAW            0x0004  /* MAC RAW mode (promiscuous) */
  65 #define   S0_MR_MACRAW_MF         0x0044  /* MAC RAW mode (filtered) */
  66 #define W5300_S0_CR             0x0202  /* S0 Command Register */
  67 #define   S0_CR_OPEN              0x0001  /* OPEN command */
  68 #define   S0_CR_CLOSE             0x0010  /* CLOSE command */
  69 #define   S0_CR_SEND              0x0020  /* SEND command */
  70 #define   S0_CR_RECV              0x0040  /* RECV command */
  71 #define W5300_S0_IMR            0x0204  /* S0 Interrupt Mask Register */
  72 #define W5300_S0_IR             0x0206  /* S0 Interrupt Register */
  73 #define   S0_IR_RECV              0x0004  /* Receive interrupt */
  74 #define   S0_IR_SENDOK            0x0010  /* Send OK interrupt */
  75 #define W5300_S0_SSR            0x0208  /* S0 Socket Status Register */
  76 #define W5300_S0_TX_WRSR        0x0220  /* S0 TX Write Size Register */
  77 #define W5300_S0_TX_FSR         0x0224  /* S0 TX Free Size Register */
  78 #define W5300_S0_RX_RSR         0x0228  /* S0 Received data Size */
  79 #define W5300_S0_TX_FIFO        0x022e  /* S0 Transmit FIFO */
  80 #define W5300_S0_RX_FIFO        0x0230  /* S0 Receive FIFO */
  81 #define W5300_REGS_LEN          0x0400
  82
  83 /*
  84  * Device driver private data structure
  85  */
  86 struct w5300_priv {
  87         void __iomem *base;
  88         spinlock_t reg_lock;
  89         bool indirect;
  90         u16  (*read) (struct w5300_priv *priv, u16 addr);
  91         void (*write)(struct w5300_priv *priv, u16 addr, u16 data);
  92         int irq;
  93         int link_irq;
  94         int link_gpio;
  95
  96         struct napi_struct napi;
  97         struct net_device *ndev;
  98         bool promisc;
  99         u32 msg_enable;
 100 };
 101
 102 /************************************************************************
 103  *
 104  *  Lowlevel I/O functions
 105  *
 106  ***********************************************************************/
 107
 108 /*
 109  * In direct address mode host system can directly access W5300 registers
 110  * after mapping to Memory-Mapped I/O space.
 111  *
 112  * 0x400 bytes are required for memory space.
 113  */
 114 static inline u16 w5300_read_direct(struct w5300_priv *priv, u16 addr)
 115 {
 116         return ioread16(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
 117 }
 118
 119 static inline void w5300_write_direct(struct w5300_priv *priv,
 120                                       u16 addr, u16 data)
 121 {
 122         iowrite16(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
 123 }
 124
 125 /*
 126  * In indirect address mode host system indirectly accesses registers by
 127  * using Indirect Mode Address Register (IDM_AR) and Indirect Mode Data
 128  * Register (IDM_DR), which are directly mapped to Memory-Mapped I/O space.
 129  * Mode Register (MR) is directly accessible.
 130  *
 131  * Only 0x06 bytes are required for memory space.
 132  */
 133 #define W5300_IDM_AR            0x0002   /* Indirect Mode Address */
 134 #define W5300_IDM_DR            0x0004   /* Indirect Mode Data */
 135
 136 static u16 w5300_read_indirect(struct w5300_priv *priv, u16 addr)
 137 {
 138         unsigned long flags;
 139         u16 data;
 140
 141         spin_lock_irqsave(&priv->reg_lock, flags);
 142         w5300_write_direct(priv, W5300_IDM_AR, addr);
 143         data = w5300_read_direct(priv, W5300_IDM_DR);
 144         spin_unlock_irqrestore(&priv->reg_lock, flags);
 145
 146         return data;
 147 }
 148
 149 static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
 150 {
 151         unsigned long flags;
 152
 153         spin_lock_irqsave(&priv->reg_lock, flags);
 154         w5300_write_direct(priv, W5300_IDM_AR, addr);
 155         w5300_write_direct(priv, W5300_IDM_DR, data);
 156         spin_unlock_irqrestore(&priv->reg_lock, flags);
 157 }
 158
 159 #if defined(CONFIG_WIZNET_BUS_DIRECT)
 160 #define w5300_read      w5300_read_direct
 161 #define w5300_write     w5300_write_direct
 162
 163 #elif defined(CONFIG_WIZNET_BUS_INDIRECT)
 164 #define w5300_read      w5300_read_indirect
 165 #define w5300_write     w5300_write_indirect
 166
 167 #else /* CONFIG_WIZNET_BUS_ANY */
 168 #define w5300_read      priv->read
 169 #define w5300_write     priv->write
 170 #endif
 171
 172 static u32 w5300_read32(struct w5300_priv *priv, u16 addr)
 173 {
 174         u32 data;
 175         data  = w5300_read(priv, addr) << 16;
 176         data |= w5300_read(priv, addr + 2);
 177         return data;
 178 }
 179
 180 static void w5300_write32(struct w5300_priv *priv, u16 addr, u32 data)
 181 {
 182         w5300_write(priv, addr, data >> 16);
 183         w5300_write(priv, addr + 2, data);
 184 }
 185
 186 static int w5300_command(struct w5300_priv *priv, u16 cmd)
 187 {
 188         unsigned long timeout = jiffies + msecs_to_jiffies(100);
 189
 190         w5300_write(priv, W5300_S0_CR, cmd);
 191
 192         while (w5300_read(priv, W5300_S0_CR) != 0) {
 193                 if (time_after(jiffies, timeout))
 194                         return -EIO;
 195                 cpu_relax();
 196         }
 197
 198         return 0;
 199 }
 200
 201 static void w5300_read_frame(struct w5300_priv *priv, u8 *buf, int len)
 202 {
 203         u16 fifo;
 204         int i;
 205
 206         for (i = 0; i < len; i += 2) {
 207                 fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 208                 *buf++ = fifo >> 8;
 209                 *buf++ = fifo;
 210         }
 211         fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 212         fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 213 }
 214
 215 static void w5300_write_frame(struct w5300_priv *priv, u8 *buf, int len)
 216 {
 217         u16 fifo;
 218         int i;
 219
 220         for (i = 0; i < len; i += 2) {
 221                 fifo  = *buf++ << 8;
 222                 fifo |= *buf++;
 223                 w5300_write(priv, W5300_S0_TX_FIFO, fifo);
 224         }
 225         w5300_write32(priv, W5300_S0_TX_WRSR, len);
 226 }
 227
 228 static void w5300_write_macaddr(struct w5300_priv *priv)
 229 {
 230         struct net_device *ndev = priv->ndev;
 231         w5300_write32(priv, W5300_SHARL,
 232                       ndev->dev_addr[0] << 24 |
 233                       ndev->dev_addr[1] << 16 |
 234                       ndev->dev_addr[2] << 8 |
 235                       ndev->dev_addr[3]);
 236         w5300_write(priv, W5300_SHARH,
 237                       ndev->dev_addr[4] << 8 |
 238                       ndev->dev_addr[5]);
 239 }
 240
 241 static void w5300_hw_reset(struct w5300_priv *priv)
 242 {
 243         w5300_write_direct(priv, W5300_MR, MR_RST);
 244         mdelay(5);
 245         w5300_write_direct(priv, W5300_MR, priv->indirect ?
 246                                  MR_WDF(7) | MR_PB | MR_IND :
 247                                  MR_WDF(7) | MR_PB);
 248         w5300_write(priv, W5300_IMR, 0);
 249         w5300_write_macaddr(priv);
 250
 251         /* Configure 128K of internal memory
 252          * as 64K RX fifo and 64K TX fifo
 253          */
 254         w5300_write32(priv, W5300_RMSRL, 64 << 24);
 255         w5300_write32(priv, W5300_RMSRH, 0);
 256         w5300_write32(priv, W5300_TMSRL, 64 << 24);
 257         w5300_write32(priv, W5300_TMSRH, 0);
 258         w5300_write(priv, W5300_MTYPE, 0x00ff);
 259 }
 260
 261 static void w5300_hw_start(struct w5300_priv *priv)
 262 {
 263         w5300_write(priv, W5300_S0_MR, priv->promisc ?
 264                           S0_MR_MACRAW : S0_MR_MACRAW_MF);
 265         w5300_command(priv, S0_CR_OPEN);
 266         w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
 267         w5300_write(priv, W5300_IMR, IR_S0);
 268 }
 269
 270 static void w5300_hw_close(struct w5300_priv *priv)
 271 {
 272         w5300_write(priv, W5300_IMR, 0);
 273         w5300_command(priv, S0_CR_CLOSE);
 274 }
 275
 276 /***********************************************************************
 277  *
 278  *   Device driver functions / callbacks
 279  *
 280  ***********************************************************************/
 281
 282 static void w5300_get_drvinfo(struct net_device *ndev,
 283                               struct ethtool_drvinfo *info)
 284 {
 285         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 286         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 287         strlcpy(info->bus_info, dev_name(ndev->dev.parent),
 288                 sizeof(info->bus_info));
 289 }
 290
 291 static u32 w5300_get_link(struct net_device *ndev)
 292 {
 293         struct w5300_priv *priv = netdev_priv(ndev);
 294
 295         if (gpio_is_valid(priv->link_gpio))
 296                 return !!gpio_get_value(priv->link_gpio);
 297
 298         return 1;
 299 }
 300
 301 static u32 w5300_get_msglevel(struct net_device *ndev)
 302 {
 303         struct w5300_priv *priv = netdev_priv(ndev);
 304
 305         return priv->msg_enable;
 306 }
 307
 308 static void w5300_set_msglevel(struct net_device *ndev, u32 value)
 309 {
 310         struct w5300_priv *priv = netdev_priv(ndev);
 311
 312         priv->msg_enable = value;
 313 }
 314
 315 static int w5300_get_regs_len(struct net_device *ndev)
 316 {
 317         return W5300_REGS_LEN;
 318 }
 319
 320 static void w5300_get_regs(struct net_device *ndev,
 321                            struct ethtool_regs *regs, void *_buf)
 322 {
 323         struct w5300_priv *priv = netdev_priv(ndev);
 324         u8 *buf = _buf;
 325         u16 addr;
 326         u16 data;
 327
 328         regs->version = 1;
 329         for (addr = 0; addr < W5300_REGS_LEN; addr += 2) {
 330                 switch (addr & 0x23f) {
 331                 case W5300_S0_TX_FIFO: /* cannot read TX_FIFO */
 332                 case W5300_S0_RX_FIFO: /* cannot read RX_FIFO */
 333                         data = 0xffff;
 334                         break;
 335                 default:
 336                         data = w5300_read(priv, addr);
 337                         break;
 338                 }
 339                 *buf++ = data >> 8;
 340                 *buf++ = data;
 341         }
 342 }
 343
 344 static void w5300_tx_timeout(struct net_device *ndev, unsigned int txqueue)
 345 {
 346         struct w5300_priv *priv = netdev_priv(ndev);
 347
 348         netif_stop_queue(ndev);
 349         w5300_hw_reset(priv);
 350         w5300_hw_start(priv);
 351         ndev->stats.tx_errors++;
 352         netif_trans_update(ndev);
 353         netif_wake_queue(ndev);
 354 }
 355
 356 static netdev_tx_t w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
 357 {
 358         struct w5300_priv *priv = netdev_priv(ndev);
 359
 360         netif_stop_queue(ndev);
 361
 362         w5300_write_frame(priv, skb->data, skb->len);
 363         ndev->stats.tx_packets++;
 364         ndev->stats.tx_bytes += skb->len;
 365         dev_kfree_skb(skb);
 366         netif_dbg(priv, tx_queued, ndev, "tx queued\n");
 367
 368         w5300_command(priv, S0_CR_SEND);
 369
 370         return NETDEV_TX_OK;
 371 }
 372
 373 static int w5300_napi_poll(struct napi_struct *napi, int budget)
 374 {
 375         struct w5300_priv *priv = container_of(napi, struct w5300_priv, napi);
 376         struct net_device *ndev = priv->ndev;
 377         struct sk_buff *skb;
 378         int rx_count;
 379         u16 rx_len;
 380
 381         for (rx_count = 0; rx_count < budget; rx_count++) {
 382                 u32 rx_fifo_len = w5300_read32(priv, W5300_S0_RX_RSR);
 383                 if (rx_fifo_len == 0)
 384                         break;
 385
 386                 rx_len = w5300_read(priv, W5300_S0_RX_FIFO);
 387
 388                 skb = netdev_alloc_skb_ip_align(ndev, roundup(rx_len, 2));
 389                 if (unlikely(!skb)) {
 390                         u32 i;
 391                         for (i = 0; i < rx_fifo_len; i += 2)
 392                                 w5300_read(priv, W5300_S0_RX_FIFO);
 393                         ndev->stats.rx_dropped++;
 394                         return -ENOMEM;
 395                 }
 396
 397                 skb_put(skb, rx_len);
 398                 w5300_read_frame(priv, skb->data, rx_len);
 399                 skb->protocol = eth_type_trans(skb, ndev);
 400
 401                 netif_receive_skb(skb);
 402                 ndev->stats.rx_packets++;
 403                 ndev->stats.rx_bytes += rx_len;
 404         }
 405
 406         if (rx_count < budget) {
 407                 napi_complete_done(napi, rx_count);
 408                 w5300_write(priv, W5300_IMR, IR_S0);
 409         }
 410
 411         return rx_count;
 412 }
 413
 414 static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
 415 {
 416         struct net_device *ndev = ndev_instance;
 417         struct w5300_priv *priv = netdev_priv(ndev);
 418
 419         int ir = w5300_read(priv, W5300_S0_IR);
 420         if (!ir)
 421                 return IRQ_NONE;
 422         w5300_write(priv, W5300_S0_IR, ir);
 423
 424         if (ir & S0_IR_SENDOK) {
 425                 netif_dbg(priv, tx_done, ndev, "tx done\n");
 426                 netif_wake_queue(ndev);
 427         }
 428
 429         if (ir & S0_IR_RECV) {
 430                 if (napi_schedule_prep(&priv->napi)) {
 431                         w5300_write(priv, W5300_IMR, 0);
 432                         __napi_schedule(&priv->napi);
 433                 }
 434         }
 435
 436         return IRQ_HANDLED;
 437 }
 438
 439 static irqreturn_t w5300_detect_link(int irq, void *ndev_instance)
 440 {
 441         struct net_device *ndev = ndev_instance;
 442         struct w5300_priv *priv = netdev_priv(ndev);
 443
 444         if (netif_running(ndev)) {
 445                 if (gpio_get_value(priv->link_gpio) != 0) {
 446                         netif_info(priv, link, ndev, "link is up\n");
 447                         netif_carrier_on(ndev);
 448                 } else {
 449                         netif_info(priv, link, ndev, "link is down\n");
 450                         netif_carrier_off(ndev);
 451                 }
 452         }
 453
 454         return IRQ_HANDLED;
 455 }
 456
 457 static void w5300_set_rx_mode(struct net_device *ndev)
 458 {
 459         struct w5300_priv *priv = netdev_priv(ndev);
 460         bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;
 461
 462         if (priv->promisc != set_promisc) {
 463                 priv->promisc = set_promisc;
 464                 w5300_hw_start(priv);
 465         }
 466 }
 467
 468 static int w5300_set_macaddr(struct net_device *ndev, void *addr)
 469 {
 470         struct w5300_priv *priv = netdev_priv(ndev);
 471         struct sockaddr *sock_addr = addr;
 472
 473         if (!is_valid_ether_addr(sock_addr->sa_data))
 474                 return -EADDRNOTAVAIL;
 475         memcpy(ndev->dev_addr, sock_addr->sa_data, ETH_ALEN);
 476         w5300_write_macaddr(priv);
 477         return 0;
 478 }
 479
 480 static int w5300_open(struct net_device *ndev)
 481 {
 482         struct w5300_priv *priv = netdev_priv(ndev);
 483
 484         netif_info(priv, ifup, ndev, "enabling\n");
 485         w5300_hw_start(priv);
 486         napi_enable(&priv->napi);
 487         netif_start_queue(ndev);
 488         if (!gpio_is_valid(priv->link_gpio) ||
 489             gpio_get_value(priv->link_gpio) != 0)
 490                 netif_carrier_on(ndev);
 491         return 0;
 492 }
 493
 494 static int w5300_stop(struct net_device *ndev)
 495 {
 496         struct w5300_priv *priv = netdev_priv(ndev);
 497
 498         netif_info(priv, ifdown, ndev, "shutting down\n");
 499         w5300_hw_close(priv);
 500         netif_carrier_off(ndev);
 501         netif_stop_queue(ndev);
 502         napi_disable(&priv->napi);
 503         return 0;
 504 }
 505
 506 static const struct ethtool_ops w5300_ethtool_ops = {
 507         .get_drvinfo            = w5300_get_drvinfo,
 508         .get_msglevel           = w5300_get_msglevel,
 509         .set_msglevel           = w5300_set_msglevel,
 510         .get_link               = w5300_get_link,
 511         .get_regs_len           = w5300_get_regs_len,
 512         .get_regs               = w5300_get_regs,
 513 };
 514
 515 static const struct net_device_ops w5300_netdev_ops = {
 516         .ndo_open               = w5300_open,
 517         .ndo_stop               = w5300_stop,
 518         .ndo_start_xmit         = w5300_start_tx,
 519         .ndo_tx_timeout         = w5300_tx_timeout,
 520         .ndo_set_rx_mode        = w5300_set_rx_mode,
 521         .ndo_set_mac_address    = w5300_set_macaddr,
 522         .ndo_validate_addr      = eth_validate_addr,
 523 };
 524
 525 static int w5300_hw_probe(struct platform_device *pdev)
 526 {
 527         struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
 528         struct net_device *ndev = platform_get_drvdata(pdev);
 529         struct w5300_priv *priv = netdev_priv(ndev);
 530         const char *name = netdev_name(ndev);
 531         struct resource *mem;
 532         int mem_size;
 533         int irq;
 534         int ret;
 535
 536         if (data && is_valid_ether_addr(data->mac_addr)) {
 537                 memcpy(ndev->dev_addr, data->mac_addr, ETH_ALEN);
 538         } else {
 539                 eth_hw_addr_random(ndev);
 540         }
 541
 542         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 543         priv->base = devm_ioremap_resource(&pdev->dev, mem);
 544         if (IS_ERR(priv->base))
 545                 return PTR_ERR(priv->base);
 546
 547         mem_size = resource_size(mem);
 548
 549         spin_lock_init(&priv->reg_lock);
 550         priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
 551         if (priv->indirect) {
 552                 priv->read  = w5300_read_indirect;
 553                 priv->write = w5300_write_indirect;
 554         } else {
 555                 priv->read  = w5300_read_direct;
 556                 priv->write = w5300_write_direct;
 557         }
 558
 559         w5300_hw_reset(priv);
 560         if (w5300_read(priv, W5300_IDR) != IDR_W5300)
 561                 return -ENODEV;
 562
 563         irq = platform_get_irq(pdev, 0);
 564         if (irq < 0)
 565                 return irq;
 566         ret = request_irq(irq, w5300_interrupt,
 567                           IRQ_TYPE_LEVEL_LOW, name, ndev);
 568         if (ret < 0)
 569                 return ret;
 570         priv->irq = irq;
 571
 572         priv->link_gpio = data ? data->link_gpio : -EINVAL;
 573         if (gpio_is_valid(priv->link_gpio)) {
 574                 char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
 575                 if (!link_name)
 576                         return -ENOMEM;
 577                 snprintf(link_name, 16, "%s-link", name);
 578                 priv->link_irq = gpio_to_irq(priv->link_gpio);
 579                 if (request_any_context_irq(priv->link_irq, w5300_detect_link,
 580                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 581                                 link_name, priv->ndev) < 0)
 582                         priv->link_gpio = -EINVAL;
 583         }
 584
 585         netdev_info(ndev, "at 0x%llx irq %d\n", (u64)mem->start, irq);
 586         return 0;
 587 }
 588
 589 static int w5300_probe(struct platform_device *pdev)
 590 {
 591         struct w5300_priv *priv;
 592         struct net_device *ndev;
 593         int err;
 594
 595         ndev = alloc_etherdev(sizeof(*priv));
 596         if (!ndev)
 597                 return -ENOMEM;
 598         SET_NETDEV_DEV(ndev, &pdev->dev);
 599         platform_set_drvdata(pdev, ndev);
 600         priv = netdev_priv(ndev);
 601         priv->ndev = ndev;
 602
 603         ndev->netdev_ops = &w5300_netdev_ops;
 604         ndev->ethtool_ops = &w5300_ethtool_ops;
 605         ndev->watchdog_timeo = HZ;
 606         netif_napi_add(ndev, &priv->napi, w5300_napi_poll, 16);
 607
 608         /* This chip doesn't support VLAN packets with normal MTU,
 609          * so disable VLAN for this device.
 610          */
 611         ndev->features |= NETIF_F_VLAN_CHALLENGED;
 612
 613         err = register_netdev(ndev);
 614         if (err < 0)
 615                 goto err_register;
 616
 617         err = w5300_hw_probe(pdev);
 618         if (err < 0)
 619                 goto err_hw_probe;
 620
 621         return 0;
 622
 623 err_hw_probe:
 624         unregister_netdev(ndev);
 625 err_register:
 626         free_netdev(ndev);
 627         return err;
 628 }
 629
 630 static int w5300_remove(struct platform_device *pdev)
 631 {
 632         struct net_device *ndev = platform_get_drvdata(pdev);
 633         struct w5300_priv *priv = netdev_priv(ndev);
 634
 635         w5300_hw_reset(priv);
 636         free_irq(priv->irq, ndev);
 637         if (gpio_is_valid(priv->link_gpio))
 638                 free_irq(priv->link_irq, ndev);
 639
 640         unregister_netdev(ndev);
 641         free_netdev(ndev);
 642         return 0;
 643 }
 644
 645 #ifdef CONFIG_PM_SLEEP
 646 static int w5300_suspend(struct device *dev)
 647 {
 648         struct net_device *ndev = dev_get_drvdata(dev);
 649         struct w5300_priv *priv = netdev_priv(ndev);
 650
 651         if (netif_running(ndev)) {
 652                 netif_carrier_off(ndev);
 653                 netif_device_detach(ndev);
 654
 655                 w5300_hw_close(priv);
 656         }
 657         return 0;
 658 }
 659
 660 static int w5300_resume(struct device *dev)
 661 {
 662         struct net_device *ndev = dev_get_drvdata(dev);
 663         struct w5300_priv *priv = netdev_priv(ndev);
 664
 665         if (!netif_running(ndev)) {
 666                 w5300_hw_reset(priv);
 667                 w5300_hw_start(priv);
 668
 669                 netif_device_attach(ndev);
 670                 if (!gpio_is_valid(priv->link_gpio) ||
 671                     gpio_get_value(priv->link_gpio) != 0)
 672                         netif_carrier_on(ndev);
 673         }
 674         return 0;
 675 }
 676 #endif /* CONFIG_PM_SLEEP */
 677
 678 static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);
 679
 680 static struct platform_driver w5300_driver = {
 681         .driver         = {
 682                 .name   = DRV_NAME,
 683                 .pm     = &w5300_pm_ops,
 684         },
 685         .probe          = w5300_probe,
 686         .remove         = w5300_remove,
 687 };
 688
 689 module_platform_driver(w5300_driver);