linux/drivers/net/ethernet/wiznet/w5300.c
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   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
  32MODULE_DESCRIPTION("WIZnet W5300 Ethernet driver v"DRV_VERSION);
  33MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
  34MODULE_ALIAS("platform:"DRV_NAME);
  35MODULE_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 */
  86struct 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 */
 114static inline u16 w5300_read_direct(struct w5300_priv *priv, u16 addr)
 115{
 116        return ioread16(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
 117}
 118
 119static 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
 136static 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
 149static 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
 172static 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
 180static 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
 186static 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
 201static 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
 215static 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
 228static 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
 241static 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
 261static 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
 270static 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
 282static 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
 291static 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
 301static 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
 308static 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
 315static int w5300_get_regs_len(struct net_device *ndev)
 316{
 317        return W5300_REGS_LEN;
 318}
 319
 320static 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
 344static 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
 356static 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
 373static 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
 414static 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
 439static 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
 457static 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
 468static 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        eth_hw_addr_set(ndev, sock_addr->sa_data);
 476        w5300_write_macaddr(priv);
 477        return 0;
 478}
 479
 480static 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
 494static 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
 506static 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
 515static 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
 525static 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                eth_hw_addr_set(ndev, data->mac_addr);
 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
 589static 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
 623err_hw_probe:
 624        unregister_netdev(ndev);
 625err_register:
 626        free_netdev(ndev);
 627        return err;
 628}
 629
 630static 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
 646static 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
 660static 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
 678static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);
 679
 680static 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
 689module_platform_driver(w5300_driver);
 690