Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/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/kconfig.h>
 14 #include <linux/netdevice.h>
 15 #include <linux/etherdevice.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/platform_data/wiznet.h>
 18 #include <linux/ethtool.h>
 19 #include <linux/skbuff.h>
 20 #include <linux/types.h>
 21 #include <linux/errno.h>
 22 #include <linux/delay.h>
 23 #include <linux/slab.h>
 24 #include <linux/spinlock.h>
 25 #include <linux/io.h>
 26 #include <linux/ioport.h>
 27 #include <linux/interrupt.h>
 28 #include <linux/irq.h>
 29 #include <linux/gpio.h>
 30 
 31 #define DRV_NAME        "w5300"
 32 #define DRV_VERSION     "2012-04-04"
 33 
 34 MODULE_DESCRIPTION("WIZnet W5300 Ethernet driver v"DRV_VERSION);
 35 MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
 36 MODULE_ALIAS("platform:"DRV_NAME);
 37 MODULE_LICENSE("GPL");
 38 
 39 /*
 40  * Registers
 41  */
 42 #define W5300_MR                0x0000  /* Mode Register */
 43 #define   MR_DBW                  (1 << 15) /* Data bus width */
 44 #define   MR_MPF                  (1 << 14) /* Mac layer pause frame */
 45 #define   MR_WDF(n)               (((n)&7)<<11) /* Write data fetch time */
 46 #define   MR_RDH                  (1 << 10) /* Read data hold time */
 47 #define   MR_FS                   (1 << 8)  /* FIFO swap */
 48 #define   MR_RST                  (1 << 7)  /* S/W reset */
 49 #define   MR_PB                   (1 << 4)  /* Ping block */
 50 #define   MR_DBS                  (1 << 2)  /* Data bus swap */
 51 #define   MR_IND                  (1 << 0)  /* Indirect mode */
 52 #define W5300_IR                0x0002  /* Interrupt Register */
 53 #define W5300_IMR               0x0004  /* Interrupt Mask Register */
 54 #define   IR_S0                   0x0001  /* S0 interrupt */
 55 #define W5300_SHARL             0x0008  /* Source MAC address (0123) */
 56 #define W5300_SHARH             0x000c  /* Source MAC address (45) */
 57 #define W5300_TMSRL             0x0020  /* Transmit Memory Size (0123) */
 58 #define W5300_TMSRH             0x0024  /* Transmit Memory Size (4567) */
 59 #define W5300_RMSRL             0x0028  /* Receive Memory Size (0123) */
 60 #define W5300_RMSRH             0x002c  /* Receive Memory Size (4567) */
 61 #define W5300_MTYPE             0x0030  /* Memory Type */
 62 #define W5300_IDR               0x00fe  /* Chip ID register */
 63 #define   IDR_W5300               0x5300  /* =0x5300 for WIZnet W5300 */
 64 #define W5300_S0_MR             0x0200  /* S0 Mode Register */
 65 #define   S0_MR_CLOSED            0x0000  /* Close mode */
 66 #define   S0_MR_MACRAW            0x0004  /* MAC RAW mode (promiscous) */
 67 #define   S0_MR_MACRAW_MF         0x0044  /* MAC RAW mode (filtered) */
 68 #define W5300_S0_CR             0x0202  /* S0 Command Register */
 69 #define   S0_CR_OPEN              0x0001  /* OPEN command */
 70 #define   S0_CR_CLOSE             0x0010  /* CLOSE command */
 71 #define   S0_CR_SEND              0x0020  /* SEND command */
 72 #define   S0_CR_RECV              0x0040  /* RECV command */
 73 #define W5300_S0_IMR            0x0204  /* S0 Interrupt Mask Register */
 74 #define W5300_S0_IR             0x0206  /* S0 Interrupt Register */
 75 #define   S0_IR_RECV              0x0004  /* Receive interrupt */
 76 #define   S0_IR_SENDOK            0x0010  /* Send OK interrupt */
 77 #define W5300_S0_SSR            0x0208  /* S0 Socket Status Register */
 78 #define W5300_S0_TX_WRSR        0x0220  /* S0 TX Write Size Register */
 79 #define W5300_S0_TX_FSR         0x0224  /* S0 TX Free Size Register */
 80 #define W5300_S0_RX_RSR         0x0228  /* S0 Received data Size */
 81 #define W5300_S0_TX_FIFO        0x022e  /* S0 Transmit FIFO */
 82 #define W5300_S0_RX_FIFO        0x0230  /* S0 Receive FIFO */
 83 #define W5300_REGS_LEN          0x0400
 84 
 85 /*
 86  * Device driver private data structure
 87  */
 88 struct w5300_priv {
 89         void __iomem *base;
 90         spinlock_t reg_lock;
 91         bool indirect;
 92         u16  (*read) (struct w5300_priv *priv, u16 addr);
 93         void (*write)(struct w5300_priv *priv, u16 addr, u16 data);
 94         int irq;
 95         int link_irq;
 96         int link_gpio;
 97 
 98         struct napi_struct napi;
 99         struct net_device *ndev;
100         bool promisc;
101         u32 msg_enable;
102 };
103 
104 /************************************************************************
105  *
106  *  Lowlevel I/O functions
107  *
108  ***********************************************************************/
109 
110 /*
111  * In direct address mode host system can directly access W5300 registers
112  * after mapping to Memory-Mapped I/O space.
113  *
114  * 0x400 bytes are required for memory space.
115  */
116 static inline u16 w5300_read_direct(struct w5300_priv *priv, u16 addr)
117 {
118         return ioread16(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
119 }
120 
121 static inline void w5300_write_direct(struct w5300_priv *priv,
122                                       u16 addr, u16 data)
123 {
124         iowrite16(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
125 }
126 
127 /*
128  * In indirect address mode host system indirectly accesses registers by
129  * using Indirect Mode Address Register (IDM_AR) and Indirect Mode Data
130  * Register (IDM_DR), which are directly mapped to Memory-Mapped I/O space.
131  * Mode Register (MR) is directly accessible.
132  *
133  * Only 0x06 bytes are required for memory space.
134  */
135 #define W5300_IDM_AR            0x0002   /* Indirect Mode Address */
136 #define W5300_IDM_DR            0x0004   /* Indirect Mode Data */
137 
138 static u16 w5300_read_indirect(struct w5300_priv *priv, u16 addr)
139 {
140         unsigned long flags;
141         u16 data;
142 
143         spin_lock_irqsave(&priv->reg_lock, flags);
144         w5300_write_direct(priv, W5300_IDM_AR, addr);
145         mmiowb();
146         data = w5300_read_direct(priv, W5300_IDM_DR);
147         spin_unlock_irqrestore(&priv->reg_lock, flags);
148 
149         return data;
150 }
151 
152 static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
153 {
154         unsigned long flags;
155 
156         spin_lock_irqsave(&priv->reg_lock, flags);
157         w5300_write_direct(priv, W5300_IDM_AR, addr);
158         mmiowb();
159         w5300_write_direct(priv, W5300_IDM_DR, data);
160         mmiowb();
161         spin_unlock_irqrestore(&priv->reg_lock, flags);
162 }
163 
164 #if defined(CONFIG_WIZNET_BUS_DIRECT)
165 #define w5300_read      w5300_read_direct
166 #define w5300_write     w5300_write_direct
167 
168 #elif defined(CONFIG_WIZNET_BUS_INDIRECT)
169 #define w5300_read      w5300_read_indirect
170 #define w5300_write     w5300_write_indirect
171 
172 #else /* CONFIG_WIZNET_BUS_ANY */
173 #define w5300_read      priv->read
174 #define w5300_write     priv->write
175 #endif
176 
177 static u32 w5300_read32(struct w5300_priv *priv, u16 addr)
178 {
179         u32 data;
180         data  = w5300_read(priv, addr) << 16;
181         data |= w5300_read(priv, addr + 2);
182         return data;
183 }
184 
185 static void w5300_write32(struct w5300_priv *priv, u16 addr, u32 data)
186 {
187         w5300_write(priv, addr, data >> 16);
188         w5300_write(priv, addr + 2, data);
189 }
190 
191 static int w5300_command(struct w5300_priv *priv, u16 cmd)
192 {
193         unsigned long timeout = jiffies + msecs_to_jiffies(100);
194 
195         w5300_write(priv, W5300_S0_CR, cmd);
196         mmiowb();
197 
198         while (w5300_read(priv, W5300_S0_CR) != 0) {
199                 if (time_after(jiffies, timeout))
200                         return -EIO;
201                 cpu_relax();
202         }
203 
204         return 0;
205 }
206 
207 static void w5300_read_frame(struct w5300_priv *priv, u8 *buf, int len)
208 {
209         u16 fifo;
210         int i;
211 
212         for (i = 0; i < len; i += 2) {
213                 fifo = w5300_read(priv, W5300_S0_RX_FIFO);
214                 *buf++ = fifo >> 8;
215                 *buf++ = fifo;
216         }
217         fifo = w5300_read(priv, W5300_S0_RX_FIFO);
218         fifo = w5300_read(priv, W5300_S0_RX_FIFO);
219 }
220 
221 static void w5300_write_frame(struct w5300_priv *priv, u8 *buf, int len)
222 {
223         u16 fifo;
224         int i;
225 
226         for (i = 0; i < len; i += 2) {
227                 fifo  = *buf++ << 8;
228                 fifo |= *buf++;
229                 w5300_write(priv, W5300_S0_TX_FIFO, fifo);
230         }
231         w5300_write32(priv, W5300_S0_TX_WRSR, len);
232 }
233 
234 static void w5300_write_macaddr(struct w5300_priv *priv)
235 {
236         struct net_device *ndev = priv->ndev;
237         w5300_write32(priv, W5300_SHARL,
238                       ndev->dev_addr[0] << 24 |
239                       ndev->dev_addr[1] << 16 |
240                       ndev->dev_addr[2] << 8 |
241                       ndev->dev_addr[3]);
242         w5300_write(priv, W5300_SHARH,
243                       ndev->dev_addr[4] << 8 |
244                       ndev->dev_addr[5]);
245         mmiowb();
246 }
247 
248 static void w5300_hw_reset(struct w5300_priv *priv)
249 {
250         w5300_write_direct(priv, W5300_MR, MR_RST);
251         mmiowb();
252         mdelay(5);
253         w5300_write_direct(priv, W5300_MR, priv->indirect ?
254                                  MR_WDF(7) | MR_PB | MR_IND :
255                                  MR_WDF(7) | MR_PB);
256         mmiowb();
257         w5300_write(priv, W5300_IMR, 0);
258         w5300_write_macaddr(priv);
259 
260         /* Configure 128K of internal memory
261          * as 64K RX fifo and 64K TX fifo
262          */
263         w5300_write32(priv, W5300_RMSRL, 64 << 24);
264         w5300_write32(priv, W5300_RMSRH, 0);
265         w5300_write32(priv, W5300_TMSRL, 64 << 24);
266         w5300_write32(priv, W5300_TMSRH, 0);
267         w5300_write(priv, W5300_MTYPE, 0x00ff);
268         mmiowb();
269 }
270 
271 static void w5300_hw_start(struct w5300_priv *priv)
272 {
273         w5300_write(priv, W5300_S0_MR, priv->promisc ?
274                           S0_MR_MACRAW : S0_MR_MACRAW_MF);
275         mmiowb();
276         w5300_command(priv, S0_CR_OPEN);
277         w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
278         w5300_write(priv, W5300_IMR, IR_S0);
279         mmiowb();
280 }
281 
282 static void w5300_hw_close(struct w5300_priv *priv)
283 {
284         w5300_write(priv, W5300_IMR, 0);
285         mmiowb();
286         w5300_command(priv, S0_CR_CLOSE);
287 }
288 
289 /***********************************************************************
290  *
291  *   Device driver functions / callbacks
292  *
293  ***********************************************************************/
294 
295 static void w5300_get_drvinfo(struct net_device *ndev,
296                               struct ethtool_drvinfo *info)
297 {
298         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
299         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
300         strlcpy(info->bus_info, dev_name(ndev->dev.parent),
301                 sizeof(info->bus_info));
302 }
303 
304 static u32 w5300_get_link(struct net_device *ndev)
305 {
306         struct w5300_priv *priv = netdev_priv(ndev);
307 
308         if (gpio_is_valid(priv->link_gpio))
309                 return !!gpio_get_value(priv->link_gpio);
310 
311         return 1;
312 }
313 
314 static u32 w5300_get_msglevel(struct net_device *ndev)
315 {
316         struct w5300_priv *priv = netdev_priv(ndev);
317 
318         return priv->msg_enable;
319 }
320 
321 static void w5300_set_msglevel(struct net_device *ndev, u32 value)
322 {
323         struct w5300_priv *priv = netdev_priv(ndev);
324 
325         priv->msg_enable = value;
326 }
327 
328 static int w5300_get_regs_len(struct net_device *ndev)
329 {
330         return W5300_REGS_LEN;
331 }
332 
333 static void w5300_get_regs(struct net_device *ndev,
334                            struct ethtool_regs *regs, void *_buf)
335 {
336         struct w5300_priv *priv = netdev_priv(ndev);
337         u8 *buf = _buf;
338         u16 addr;
339         u16 data;
340 
341         regs->version = 1;
342         for (addr = 0; addr < W5300_REGS_LEN; addr += 2) {
343                 switch (addr & 0x23f) {
344                 case W5300_S0_TX_FIFO: /* cannot read TX_FIFO */
345                 case W5300_S0_RX_FIFO: /* cannot read RX_FIFO */
346                         data = 0xffff;
347                         break;
348                 default:
349                         data = w5300_read(priv, addr);
350                         break;
351                 }
352                 *buf++ = data >> 8;
353                 *buf++ = data;
354         }
355 }
356 
357 static void w5300_tx_timeout(struct net_device *ndev)
358 {
359         struct w5300_priv *priv = netdev_priv(ndev);
360 
361         netif_stop_queue(ndev);
362         w5300_hw_reset(priv);
363         w5300_hw_start(priv);
364         ndev->stats.tx_errors++;
365         ndev->trans_start = jiffies;
366         netif_wake_queue(ndev);
367 }
368 
369 static int w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
370 {
371         struct w5300_priv *priv = netdev_priv(ndev);
372 
373         netif_stop_queue(ndev);
374 
375         w5300_write_frame(priv, skb->data, skb->len);
376         mmiowb();
377         ndev->stats.tx_packets++;
378         ndev->stats.tx_bytes += skb->len;
379         dev_kfree_skb(skb);
380         netif_dbg(priv, tx_queued, ndev, "tx queued\n");
381 
382         w5300_command(priv, S0_CR_SEND);
383 
384         return NETDEV_TX_OK;
385 }
386 
387 static int w5300_napi_poll(struct napi_struct *napi, int budget)
388 {
389         struct w5300_priv *priv = container_of(napi, struct w5300_priv, napi);
390         struct net_device *ndev = priv->ndev;
391         struct sk_buff *skb;
392         int rx_count;
393         u16 rx_len;
394 
395         for (rx_count = 0; rx_count < budget; rx_count++) {
396                 u32 rx_fifo_len = w5300_read32(priv, W5300_S0_RX_RSR);
397                 if (rx_fifo_len == 0)
398                         break;
399 
400                 rx_len = w5300_read(priv, W5300_S0_RX_FIFO);
401 
402                 skb = netdev_alloc_skb_ip_align(ndev, roundup(rx_len, 2));
403                 if (unlikely(!skb)) {
404                         u32 i;
405                         for (i = 0; i < rx_fifo_len; i += 2)
406                                 w5300_read(priv, W5300_S0_RX_FIFO);
407                         ndev->stats.rx_dropped++;
408                         return -ENOMEM;
409                 }
410 
411                 skb_put(skb, rx_len);
412                 w5300_read_frame(priv, skb->data, rx_len);
413                 skb->protocol = eth_type_trans(skb, ndev);
414 
415                 netif_receive_skb(skb);
416                 ndev->stats.rx_packets++;
417                 ndev->stats.rx_bytes += rx_len;
418         }
419 
420         if (rx_count < budget) {
421                 w5300_write(priv, W5300_IMR, IR_S0);
422                 mmiowb();
423                 napi_complete(napi);
424         }
425 
426         return rx_count;
427 }
428 
429 static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
430 {
431         struct net_device *ndev = ndev_instance;
432         struct w5300_priv *priv = netdev_priv(ndev);
433 
434         int ir = w5300_read(priv, W5300_S0_IR);
435         if (!ir)
436                 return IRQ_NONE;
437         w5300_write(priv, W5300_S0_IR, ir);
438         mmiowb();
439 
440         if (ir & S0_IR_SENDOK) {
441                 netif_dbg(priv, tx_done, ndev, "tx done\n");
442                 netif_wake_queue(ndev);
443         }
444 
445         if (ir & S0_IR_RECV) {
446                 if (napi_schedule_prep(&priv->napi)) {
447                         w5300_write(priv, W5300_IMR, 0);
448                         mmiowb();
449                         __napi_schedule(&priv->napi);
450                 }
451         }
452 
453         return IRQ_HANDLED;
454 }
455 
456 static irqreturn_t w5300_detect_link(int irq, void *ndev_instance)
457 {
458         struct net_device *ndev = ndev_instance;
459         struct w5300_priv *priv = netdev_priv(ndev);
460 
461         if (netif_running(ndev)) {
462                 if (gpio_get_value(priv->link_gpio) != 0) {
463                         netif_info(priv, link, ndev, "link is up\n");
464                         netif_carrier_on(ndev);
465                 } else {
466                         netif_info(priv, link, ndev, "link is down\n");
467                         netif_carrier_off(ndev);
468                 }
469         }
470 
471         return IRQ_HANDLED;
472 }
473 
474 static void w5300_set_rx_mode(struct net_device *ndev)
475 {
476         struct w5300_priv *priv = netdev_priv(ndev);
477         bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;
478 
479         if (priv->promisc != set_promisc) {
480                 priv->promisc = set_promisc;
481                 w5300_hw_start(priv);
482         }
483 }
484 
485 static int w5300_set_macaddr(struct net_device *ndev, void *addr)
486 {
487         struct w5300_priv *priv = netdev_priv(ndev);
488         struct sockaddr *sock_addr = addr;
489 
490         if (!is_valid_ether_addr(sock_addr->sa_data))
491                 return -EADDRNOTAVAIL;
492         memcpy(ndev->dev_addr, sock_addr->sa_data, ETH_ALEN);
493         w5300_write_macaddr(priv);
494         return 0;
495 }
496 
497 static int w5300_open(struct net_device *ndev)
498 {
499         struct w5300_priv *priv = netdev_priv(ndev);
500 
501         netif_info(priv, ifup, ndev, "enabling\n");
502         w5300_hw_start(priv);
503         napi_enable(&priv->napi);
504         netif_start_queue(ndev);
505         if (!gpio_is_valid(priv->link_gpio) ||
506             gpio_get_value(priv->link_gpio) != 0)
507                 netif_carrier_on(ndev);
508         return 0;
509 }
510 
511 static int w5300_stop(struct net_device *ndev)
512 {
513         struct w5300_priv *priv = netdev_priv(ndev);
514 
515         netif_info(priv, ifdown, ndev, "shutting down\n");
516         w5300_hw_close(priv);
517         netif_carrier_off(ndev);
518         netif_stop_queue(ndev);
519         napi_disable(&priv->napi);
520         return 0;
521 }
522 
523 static const struct ethtool_ops w5300_ethtool_ops = {
524         .get_drvinfo            = w5300_get_drvinfo,
525         .get_msglevel           = w5300_get_msglevel,
526         .set_msglevel           = w5300_set_msglevel,
527         .get_link               = w5300_get_link,
528         .get_regs_len           = w5300_get_regs_len,
529         .get_regs               = w5300_get_regs,
530 };
531 
532 static const struct net_device_ops w5300_netdev_ops = {
533         .ndo_open               = w5300_open,
534         .ndo_stop               = w5300_stop,
535         .ndo_start_xmit         = w5300_start_tx,
536         .ndo_tx_timeout         = w5300_tx_timeout,
537         .ndo_set_rx_mode        = w5300_set_rx_mode,
538         .ndo_set_mac_address    = w5300_set_macaddr,
539         .ndo_validate_addr      = eth_validate_addr,
540         .ndo_change_mtu         = eth_change_mtu,
541 };
542 
543 static int w5300_hw_probe(struct platform_device *pdev)
544 {
545         struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
546         struct net_device *ndev = platform_get_drvdata(pdev);
547         struct w5300_priv *priv = netdev_priv(ndev);
548         const char *name = netdev_name(ndev);
549         struct resource *mem;
550         int mem_size;
551         int irq;
552         int ret;
553 
554         if (data && is_valid_ether_addr(data->mac_addr)) {
555                 memcpy(ndev->dev_addr, data->mac_addr, ETH_ALEN);
556         } else {
557                 eth_hw_addr_random(ndev);
558         }
559 
560         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
561         if (!mem)
562                 return -ENXIO;
563         mem_size = resource_size(mem);
564 
565         priv->base = devm_ioremap_resource(&pdev->dev, mem);
566         if (IS_ERR(priv->base))
567                 return PTR_ERR(priv->base);
568 
569         spin_lock_init(&priv->reg_lock);
570         priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
571         if (priv->indirect) {
572                 priv->read  = w5300_read_indirect;
573                 priv->write = w5300_write_indirect;
574         } else {
575                 priv->read  = w5300_read_direct;
576                 priv->write = w5300_write_direct;
577         }
578 
579         w5300_hw_reset(priv);
580         if (w5300_read(priv, W5300_IDR) != IDR_W5300)
581                 return -ENODEV;
582 
583         irq = platform_get_irq(pdev, 0);
584         if (irq < 0)
585                 return irq;
586         ret = request_irq(irq, w5300_interrupt,
587                           IRQ_TYPE_LEVEL_LOW, name, ndev);
588         if (ret < 0)
589                 return ret;
590         priv->irq = irq;
591 
592         priv->link_gpio = data ? data->link_gpio : -EINVAL;
593         if (gpio_is_valid(priv->link_gpio)) {
594                 char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
595                 if (!link_name)
596                         return -ENOMEM;
597                 snprintf(link_name, 16, "%s-link", name);
598                 priv->link_irq = gpio_to_irq(priv->link_gpio);
599                 if (request_any_context_irq(priv->link_irq, w5300_detect_link,
600                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
601                                 link_name, priv->ndev) < 0)
602                         priv->link_gpio = -EINVAL;
603         }
604 
605         netdev_info(ndev, "at 0x%llx irq %d\n", (u64)mem->start, irq);
606         return 0;
607 }
608 
609 static int w5300_probe(struct platform_device *pdev)
610 {
611         struct w5300_priv *priv;
612         struct net_device *ndev;
613         int err;
614 
615         ndev = alloc_etherdev(sizeof(*priv));
616         if (!ndev)
617                 return -ENOMEM;
618         SET_NETDEV_DEV(ndev, &pdev->dev);
619         platform_set_drvdata(pdev, ndev);
620         priv = netdev_priv(ndev);
621         priv->ndev = ndev;
622 
623         ether_setup(ndev);
624         ndev->netdev_ops = &w5300_netdev_ops;
625         ndev->ethtool_ops = &w5300_ethtool_ops;
626         ndev->watchdog_timeo = HZ;
627         netif_napi_add(ndev, &priv->napi, w5300_napi_poll, 16);
628 
629         /* This chip doesn't support VLAN packets with normal MTU,
630          * so disable VLAN for this device.
631          */
632         ndev->features |= NETIF_F_VLAN_CHALLENGED;
633 
634         err = register_netdev(ndev);
635         if (err < 0)
636                 goto err_register;
637 
638         err = w5300_hw_probe(pdev);
639         if (err < 0)
640                 goto err_hw_probe;
641 
642         return 0;
643 
644 err_hw_probe:
645         unregister_netdev(ndev);
646 err_register:
647         free_netdev(ndev);
648         return err;
649 }
650 
651 static int w5300_remove(struct platform_device *pdev)
652 {
653         struct net_device *ndev = platform_get_drvdata(pdev);
654         struct w5300_priv *priv = netdev_priv(ndev);
655 
656         w5300_hw_reset(priv);
657         free_irq(priv->irq, ndev);
658         if (gpio_is_valid(priv->link_gpio))
659                 free_irq(priv->link_irq, ndev);
660 
661         unregister_netdev(ndev);
662         free_netdev(ndev);
663         return 0;
664 }
665 
666 #ifdef CONFIG_PM_SLEEP
667 static int w5300_suspend(struct device *dev)
668 {
669         struct platform_device *pdev = to_platform_device(dev);
670         struct net_device *ndev = platform_get_drvdata(pdev);
671         struct w5300_priv *priv = netdev_priv(ndev);
672 
673         if (netif_running(ndev)) {
674                 netif_carrier_off(ndev);
675                 netif_device_detach(ndev);
676 
677                 w5300_hw_close(priv);
678         }
679         return 0;
680 }
681 
682 static int w5300_resume(struct device *dev)
683 {
684         struct platform_device *pdev = to_platform_device(dev);
685         struct net_device *ndev = platform_get_drvdata(pdev);
686         struct w5300_priv *priv = netdev_priv(ndev);
687 
688         if (!netif_running(ndev)) {
689                 w5300_hw_reset(priv);
690                 w5300_hw_start(priv);
691 
692                 netif_device_attach(ndev);
693                 if (!gpio_is_valid(priv->link_gpio) ||
694                     gpio_get_value(priv->link_gpio) != 0)
695                         netif_carrier_on(ndev);
696         }
697         return 0;
698 }
699 #endif /* CONFIG_PM_SLEEP */
700 
701 static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);
702 
703 static struct platform_driver w5300_driver = {
704         .driver         = {
705                 .name   = DRV_NAME,
706                 .owner  = THIS_MODULE,
707                 .pm     = &w5300_pm_ops,
708         },
709         .probe          = w5300_probe,
710         .remove         = w5300_remove,
711 };
712 
713 module_platform_driver(w5300_driver);
714 

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