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n_tty: Reduce branching in canon_copy_from_read_buf()
[linux/fpc-iii.git] / drivers / net / ethernet / wiznet / w5100.c
blob8b282d0b169c4a06e82479b215dbb02fcceb4c1e
1 /*
2 * Ethernet driver for the WIZnet W5100 chip.
3 *
4 * Copyright (C) 2006-2008 WIZnet Co.,Ltd.
5 * Copyright (C) 2012 Mike Sinkovsky <msink@permonline.ru>
6 *
7 * Licensed under the GPL-2 or later.
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/kconfig.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 "w5100"
31 #define DRV_VERSION "2012-04-04"
32
33 MODULE_DESCRIPTION("WIZnet W5100 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 W5100_COMMON_REGS 0x0000
42 #define W5100_MR 0x0000 /* Mode Register */
43 #define MR_RST 0x80 /* S/W reset */
44 #define MR_PB 0x10 /* Ping block */
45 #define MR_AI 0x02 /* Address Auto-Increment */
46 #define MR_IND 0x01 /* Indirect mode */
47 #define W5100_SHAR 0x0009 /* Source MAC address */
48 #define W5100_IR 0x0015 /* Interrupt Register */
49 #define W5100_IMR 0x0016 /* Interrupt Mask Register */
50 #define IR_S0 0x01 /* S0 interrupt */
51 #define W5100_RTR 0x0017 /* Retry Time-value Register */
52 #define RTR_DEFAULT 2000 /* =0x07d0 (2000) */
53 #define W5100_RMSR 0x001a /* Receive Memory Size */
54 #define W5100_TMSR 0x001b /* Transmit Memory Size */
55 #define W5100_COMMON_REGS_LEN 0x0040
56
57 #define W5100_S0_REGS 0x0400
58 #define W5100_S0_MR 0x0400 /* S0 Mode Register */
59 #define S0_MR_MACRAW 0x04 /* MAC RAW mode (promiscuous) */
60 #define S0_MR_MACRAW_MF 0x44 /* MAC RAW mode (filtered) */
61 #define W5100_S0_CR 0x0401 /* S0 Command Register */
62 #define S0_CR_OPEN 0x01 /* OPEN command */
63 #define S0_CR_CLOSE 0x10 /* CLOSE command */
64 #define S0_CR_SEND 0x20 /* SEND command */
65 #define S0_CR_RECV 0x40 /* RECV command */
66 #define W5100_S0_IR 0x0402 /* S0 Interrupt Register */
67 #define S0_IR_SENDOK 0x10 /* complete sending */
68 #define S0_IR_RECV 0x04 /* receiving data */
69 #define W5100_S0_SR 0x0403 /* S0 Status Register */
70 #define S0_SR_MACRAW 0x42 /* mac raw mode */
71 #define W5100_S0_TX_FSR 0x0420 /* S0 Transmit free memory size */
72 #define W5100_S0_TX_RD 0x0422 /* S0 Transmit memory read pointer */
73 #define W5100_S0_TX_WR 0x0424 /* S0 Transmit memory write pointer */
74 #define W5100_S0_RX_RSR 0x0426 /* S0 Receive free memory size */
75 #define W5100_S0_RX_RD 0x0428 /* S0 Receive memory read pointer */
76 #define W5100_S0_REGS_LEN 0x0040
77
78 #define W5100_TX_MEM_START 0x4000
79 #define W5100_TX_MEM_END 0x5fff
80 #define W5100_TX_MEM_MASK 0x1fff
81 #define W5100_RX_MEM_START 0x6000
82 #define W5100_RX_MEM_END 0x7fff
83 #define W5100_RX_MEM_MASK 0x1fff
84
85 /*
86 * Device driver private data structure
87 */
88 struct w5100_priv {
89 void __iomem *base;
90 spinlock_t reg_lock;
91 bool indirect;
92 u8 (*read)(struct w5100_priv *priv, u16 addr);
93 void (*write)(struct w5100_priv *priv, u16 addr, u8 data);
94 u16 (*read16)(struct w5100_priv *priv, u16 addr);
95 void (*write16)(struct w5100_priv *priv, u16 addr, u16 data);
96 void (*readbuf)(struct w5100_priv *priv, u16 addr, u8 *buf, int len);
97 void (*writebuf)(struct w5100_priv *priv, u16 addr, u8 *buf, int len);
98 int irq;
99 int link_irq;
100 int link_gpio;
101
102 struct napi_struct napi;
103 struct net_device *ndev;
104 bool promisc;
105 u32 msg_enable;
106 };
107
108 /************************************************************************
109 *
110 * Lowlevel I/O functions
111 *
112 ***********************************************************************/
113
114 /*
115 * In direct address mode host system can directly access W5100 registers
116 * after mapping to Memory-Mapped I/O space.
117 *
118 * 0x8000 bytes are required for memory space.
119 */
120 static inline u8 w5100_read_direct(struct w5100_priv *priv, u16 addr)
121 {
122 return ioread8(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
123 }
124
125 static inline void w5100_write_direct(struct w5100_priv *priv,
126 u16 addr, u8 data)
127 {
128 iowrite8(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
129 }
130
131 static u16 w5100_read16_direct(struct w5100_priv *priv, u16 addr)
132 {
133 u16 data;
134 data = w5100_read_direct(priv, addr) << 8;
135 data |= w5100_read_direct(priv, addr + 1);
136 return data;
137 }
138
139 static void w5100_write16_direct(struct w5100_priv *priv, u16 addr, u16 data)
140 {
141 w5100_write_direct(priv, addr, data >> 8);
142 w5100_write_direct(priv, addr + 1, data);
143 }
144
145 static void w5100_readbuf_direct(struct w5100_priv *priv,
146 u16 offset, u8 *buf, int len)
147 {
148 u16 addr = W5100_RX_MEM_START + (offset & W5100_RX_MEM_MASK);
149 int i;
150
151 for (i = 0; i < len; i++, addr++) {
152 if (unlikely(addr > W5100_RX_MEM_END))
153 addr = W5100_RX_MEM_START;
154 *buf++ = w5100_read_direct(priv, addr);
155 }
156 }
157
158 static void w5100_writebuf_direct(struct w5100_priv *priv,
159 u16 offset, u8 *buf, int len)
160 {
161 u16 addr = W5100_TX_MEM_START + (offset & W5100_TX_MEM_MASK);
162 int i;
163
164 for (i = 0; i < len; i++, addr++) {
165 if (unlikely(addr > W5100_TX_MEM_END))
166 addr = W5100_TX_MEM_START;
167 w5100_write_direct(priv, addr, *buf++);
168 }
169 }
170
171 /*
172 * In indirect address mode host system indirectly accesses registers by
173 * using Indirect Mode Address Register (IDM_AR) and Indirect Mode Data
174 * Register (IDM_DR), which are directly mapped to Memory-Mapped I/O space.
175 * Mode Register (MR) is directly accessible.
176 *
177 * Only 0x04 bytes are required for memory space.
178 */
179 #define W5100_IDM_AR 0x01 /* Indirect Mode Address Register */
180 #define W5100_IDM_DR 0x03 /* Indirect Mode Data Register */
181
182 static u8 w5100_read_indirect(struct w5100_priv *priv, u16 addr)
183 {
184 unsigned long flags;
185 u8 data;
186
187 spin_lock_irqsave(&priv->reg_lock, flags);
188 w5100_write16_direct(priv, W5100_IDM_AR, addr);
189 mmiowb();
190 data = w5100_read_direct(priv, W5100_IDM_DR);
191 spin_unlock_irqrestore(&priv->reg_lock, flags);
192
193 return data;
194 }
195
196 static void w5100_write_indirect(struct w5100_priv *priv, u16 addr, u8 data)
197 {
198 unsigned long flags;
199
200 spin_lock_irqsave(&priv->reg_lock, flags);
201 w5100_write16_direct(priv, W5100_IDM_AR, addr);
202 mmiowb();
203 w5100_write_direct(priv, W5100_IDM_DR, data);
204 mmiowb();
205 spin_unlock_irqrestore(&priv->reg_lock, flags);
206 }
207
208 static u16 w5100_read16_indirect(struct w5100_priv *priv, u16 addr)
209 {
210 unsigned long flags;
211 u16 data;
212
213 spin_lock_irqsave(&priv->reg_lock, flags);
214 w5100_write16_direct(priv, W5100_IDM_AR, addr);
215 mmiowb();
216 data = w5100_read_direct(priv, W5100_IDM_DR) << 8;
217 data |= w5100_read_direct(priv, W5100_IDM_DR);
218 spin_unlock_irqrestore(&priv->reg_lock, flags);
219
220 return data;
221 }
222
223 static void w5100_write16_indirect(struct w5100_priv *priv, u16 addr, u16 data)
224 {
225 unsigned long flags;
226
227 spin_lock_irqsave(&priv->reg_lock, flags);
228 w5100_write16_direct(priv, W5100_IDM_AR, addr);
229 mmiowb();
230 w5100_write_direct(priv, W5100_IDM_DR, data >> 8);
231 w5100_write_direct(priv, W5100_IDM_DR, data);
232 mmiowb();
233 spin_unlock_irqrestore(&priv->reg_lock, flags);
234 }
235
236 static void w5100_readbuf_indirect(struct w5100_priv *priv,
237 u16 offset, u8 *buf, int len)
238 {
239 u16 addr = W5100_RX_MEM_START + (offset & W5100_RX_MEM_MASK);
240 unsigned long flags;
241 int i;
242
243 spin_lock_irqsave(&priv->reg_lock, flags);
244 w5100_write16_direct(priv, W5100_IDM_AR, addr);
245 mmiowb();
246
247 for (i = 0; i < len; i++, addr++) {
248 if (unlikely(addr > W5100_RX_MEM_END)) {
249 addr = W5100_RX_MEM_START;
250 w5100_write16_direct(priv, W5100_IDM_AR, addr);
251 mmiowb();
252 }
253 *buf++ = w5100_read_direct(priv, W5100_IDM_DR);
254 }
255 mmiowb();
256 spin_unlock_irqrestore(&priv->reg_lock, flags);
257 }
258
259 static void w5100_writebuf_indirect(struct w5100_priv *priv,
260 u16 offset, u8 *buf, int len)
261 {
262 u16 addr = W5100_TX_MEM_START + (offset & W5100_TX_MEM_MASK);
263 unsigned long flags;
264 int i;
265
266 spin_lock_irqsave(&priv->reg_lock, flags);
267 w5100_write16_direct(priv, W5100_IDM_AR, addr);
268 mmiowb();
269
270 for (i = 0; i < len; i++, addr++) {
271 if (unlikely(addr > W5100_TX_MEM_END)) {
272 addr = W5100_TX_MEM_START;
273 w5100_write16_direct(priv, W5100_IDM_AR, addr);
274 mmiowb();
275 }
276 w5100_write_direct(priv, W5100_IDM_DR, *buf++);
277 }
278 mmiowb();
279 spin_unlock_irqrestore(&priv->reg_lock, flags);
280 }
281
282 #if defined(CONFIG_WIZNET_BUS_DIRECT)
283 #define w5100_read w5100_read_direct
284 #define w5100_write w5100_write_direct
285 #define w5100_read16 w5100_read16_direct
286 #define w5100_write16 w5100_write16_direct
287 #define w5100_readbuf w5100_readbuf_direct
288 #define w5100_writebuf w5100_writebuf_direct
289
290 #elif defined(CONFIG_WIZNET_BUS_INDIRECT)
291 #define w5100_read w5100_read_indirect
292 #define w5100_write w5100_write_indirect
293 #define w5100_read16 w5100_read16_indirect
294 #define w5100_write16 w5100_write16_indirect
295 #define w5100_readbuf w5100_readbuf_indirect
296 #define w5100_writebuf w5100_writebuf_indirect
297
298 #else /* CONFIG_WIZNET_BUS_ANY */
299 #define w5100_read priv->read
300 #define w5100_write priv->write
301 #define w5100_read16 priv->read16
302 #define w5100_write16 priv->write16
303 #define w5100_readbuf priv->readbuf
304 #define w5100_writebuf priv->writebuf
305 #endif
306
307 static int w5100_command(struct w5100_priv *priv, u16 cmd)
308 {
309 unsigned long timeout = jiffies + msecs_to_jiffies(100);
310
311 w5100_write(priv, W5100_S0_CR, cmd);
312 mmiowb();
313
314 while (w5100_read(priv, W5100_S0_CR) != 0) {
315 if (time_after(jiffies, timeout))
316 return -EIO;
317 cpu_relax();
318 }
319
320 return 0;
321 }
322
323 static void w5100_write_macaddr(struct w5100_priv *priv)
324 {
325 struct net_device *ndev = priv->ndev;
326 int i;
327
328 for (i = 0; i < ETH_ALEN; i++)
329 w5100_write(priv, W5100_SHAR + i, ndev->dev_addr[i]);
330 mmiowb();
331 }
332
333 static void w5100_hw_reset(struct w5100_priv *priv)
334 {
335 w5100_write_direct(priv, W5100_MR, MR_RST);
336 mmiowb();
337 mdelay(5);
338 w5100_write_direct(priv, W5100_MR, priv->indirect ?
339 MR_PB | MR_AI | MR_IND :
340 MR_PB);
341 mmiowb();
342 w5100_write(priv, W5100_IMR, 0);
343 w5100_write_macaddr(priv);
344
345 /* Configure 16K of internal memory
346 * as 8K RX buffer and 8K TX buffer
347 */
348 w5100_write(priv, W5100_RMSR, 0x03);
349 w5100_write(priv, W5100_TMSR, 0x03);
350 mmiowb();
351 }
352
353 static void w5100_hw_start(struct w5100_priv *priv)
354 {
355 w5100_write(priv, W5100_S0_MR, priv->promisc ?
356 S0_MR_MACRAW : S0_MR_MACRAW_MF);
357 mmiowb();
358 w5100_command(priv, S0_CR_OPEN);
359 w5100_write(priv, W5100_IMR, IR_S0);
360 mmiowb();
361 }
362
363 static void w5100_hw_close(struct w5100_priv *priv)
364 {
365 w5100_write(priv, W5100_IMR, 0);
366 mmiowb();
367 w5100_command(priv, S0_CR_CLOSE);
368 }
369
370 /***********************************************************************
371 *
372 * Device driver functions / callbacks
373 *
374 ***********************************************************************/
375
376 static void w5100_get_drvinfo(struct net_device *ndev,
377 struct ethtool_drvinfo *info)
378 {
379 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
380 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
381 strlcpy(info->bus_info, dev_name(ndev->dev.parent),
382 sizeof(info->bus_info));
383 }
384
385 static u32 w5100_get_link(struct net_device *ndev)
386 {
387 struct w5100_priv *priv = netdev_priv(ndev);
388
389 if (gpio_is_valid(priv->link_gpio))
390 return !!gpio_get_value(priv->link_gpio);
391
392 return 1;
393 }
394
395 static u32 w5100_get_msglevel(struct net_device *ndev)
396 {
397 struct w5100_priv *priv = netdev_priv(ndev);
398
399 return priv->msg_enable;
400 }
401
402 static void w5100_set_msglevel(struct net_device *ndev, u32 value)
403 {
404 struct w5100_priv *priv = netdev_priv(ndev);
405
406 priv->msg_enable = value;
407 }
408
409 static int w5100_get_regs_len(struct net_device *ndev)
410 {
411 return W5100_COMMON_REGS_LEN + W5100_S0_REGS_LEN;
412 }
413
414 static void w5100_get_regs(struct net_device *ndev,
415 struct ethtool_regs *regs, void *_buf)
416 {
417 struct w5100_priv *priv = netdev_priv(ndev);
418 u8 *buf = _buf;
419 u16 i;
420
421 regs->version = 1;
422 for (i = 0; i < W5100_COMMON_REGS_LEN; i++)
423 *buf++ = w5100_read(priv, W5100_COMMON_REGS + i);
424 for (i = 0; i < W5100_S0_REGS_LEN; i++)
425 *buf++ = w5100_read(priv, W5100_S0_REGS + i);
426 }
427
428 static void w5100_tx_timeout(struct net_device *ndev)
429 {
430 struct w5100_priv *priv = netdev_priv(ndev);
431
432 netif_stop_queue(ndev);
433 w5100_hw_reset(priv);
434 w5100_hw_start(priv);
435 ndev->stats.tx_errors++;
436 ndev->trans_start = jiffies;
437 netif_wake_queue(ndev);
438 }
439
440 static int w5100_start_tx(struct sk_buff *skb, struct net_device *ndev)
441 {
442 struct w5100_priv *priv = netdev_priv(ndev);
443 u16 offset;
444
445 netif_stop_queue(ndev);
446
447 offset = w5100_read16(priv, W5100_S0_TX_WR);
448 w5100_writebuf(priv, offset, skb->data, skb->len);
449 w5100_write16(priv, W5100_S0_TX_WR, offset + skb->len);
450 mmiowb();
451 ndev->stats.tx_bytes += skb->len;
452 ndev->stats.tx_packets++;
453 dev_kfree_skb(skb);
454
455 w5100_command(priv, S0_CR_SEND);
456
457 return NETDEV_TX_OK;
458 }
459
460 static int w5100_napi_poll(struct napi_struct *napi, int budget)
461 {
462 struct w5100_priv *priv = container_of(napi, struct w5100_priv, napi);
463 struct net_device *ndev = priv->ndev;
464 struct sk_buff *skb;
465 int rx_count;
466 u16 rx_len;
467 u16 offset;
468 u8 header[2];
469
470 for (rx_count = 0; rx_count < budget; rx_count++) {
471 u16 rx_buf_len = w5100_read16(priv, W5100_S0_RX_RSR);
472 if (rx_buf_len == 0)
473 break;
474
475 offset = w5100_read16(priv, W5100_S0_RX_RD);
476 w5100_readbuf(priv, offset, header, 2);
477 rx_len = get_unaligned_be16(header) - 2;
478
479 skb = netdev_alloc_skb_ip_align(ndev, rx_len);
480 if (unlikely(!skb)) {
481 w5100_write16(priv, W5100_S0_RX_RD,
482 offset + rx_buf_len);
483 w5100_command(priv, S0_CR_RECV);
484 ndev->stats.rx_dropped++;
485 return -ENOMEM;
486 }
487
488 skb_put(skb, rx_len);
489 w5100_readbuf(priv, offset + 2, skb->data, rx_len);
490 w5100_write16(priv, W5100_S0_RX_RD, offset + 2 + rx_len);
491 mmiowb();
492 w5100_command(priv, S0_CR_RECV);
493 skb->protocol = eth_type_trans(skb, ndev);
494
495 netif_receive_skb(skb);
496 ndev->stats.rx_packets++;
497 ndev->stats.rx_bytes += rx_len;
498 }
499
500 if (rx_count < budget) {
501 napi_complete(napi);
502 w5100_write(priv, W5100_IMR, IR_S0);
503 mmiowb();
504 }
505
506 return rx_count;
507 }
508
509 static irqreturn_t w5100_interrupt(int irq, void *ndev_instance)
510 {
511 struct net_device *ndev = ndev_instance;
512 struct w5100_priv *priv = netdev_priv(ndev);
513
514 int ir = w5100_read(priv, W5100_S0_IR);
515 if (!ir)
516 return IRQ_NONE;
517 w5100_write(priv, W5100_S0_IR, ir);
518 mmiowb();
519
520 if (ir & S0_IR_SENDOK) {
521 netif_dbg(priv, tx_done, ndev, "tx done\n");
522 netif_wake_queue(ndev);
523 }
524
525 if (ir & S0_IR_RECV) {
526 if (napi_schedule_prep(&priv->napi)) {
527 w5100_write(priv, W5100_IMR, 0);
528 mmiowb();
529 __napi_schedule(&priv->napi);
530 }
531 }
532
533 return IRQ_HANDLED;
534 }
535
536 static irqreturn_t w5100_detect_link(int irq, void *ndev_instance)
537 {
538 struct net_device *ndev = ndev_instance;
539 struct w5100_priv *priv = netdev_priv(ndev);
540
541 if (netif_running(ndev)) {
542 if (gpio_get_value(priv->link_gpio) != 0) {
543 netif_info(priv, link, ndev, "link is up\n");
544 netif_carrier_on(ndev);
545 } else {
546 netif_info(priv, link, ndev, "link is down\n");
547 netif_carrier_off(ndev);
548 }
549 }
550
551 return IRQ_HANDLED;
552 }
553
554 static void w5100_set_rx_mode(struct net_device *ndev)
555 {
556 struct w5100_priv *priv = netdev_priv(ndev);
557 bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;
558
559 if (priv->promisc != set_promisc) {
560 priv->promisc = set_promisc;
561 w5100_hw_start(priv);
562 }
563 }
564
565 static int w5100_set_macaddr(struct net_device *ndev, void *addr)
566 {
567 struct w5100_priv *priv = netdev_priv(ndev);
568 struct sockaddr *sock_addr = addr;
569
570 if (!is_valid_ether_addr(sock_addr->sa_data))
571 return -EADDRNOTAVAIL;
572 memcpy(ndev->dev_addr, sock_addr->sa_data, ETH_ALEN);
573 w5100_write_macaddr(priv);
574 return 0;
575 }
576
577 static int w5100_open(struct net_device *ndev)
578 {
579 struct w5100_priv *priv = netdev_priv(ndev);
580
581 netif_info(priv, ifup, ndev, "enabling\n");
582 w5100_hw_start(priv);
583 napi_enable(&priv->napi);
584 netif_start_queue(ndev);
585 if (!gpio_is_valid(priv->link_gpio) ||
586 gpio_get_value(priv->link_gpio) != 0)
587 netif_carrier_on(ndev);
588 return 0;
589 }
590
591 static int w5100_stop(struct net_device *ndev)
592 {
593 struct w5100_priv *priv = netdev_priv(ndev);
594
595 netif_info(priv, ifdown, ndev, "shutting down\n");
596 w5100_hw_close(priv);
597 netif_carrier_off(ndev);
598 netif_stop_queue(ndev);
599 napi_disable(&priv->napi);
600 return 0;
601 }
602
603 static const struct ethtool_ops w5100_ethtool_ops = {
604 .get_drvinfo = w5100_get_drvinfo,
605 .get_msglevel = w5100_get_msglevel,
606 .set_msglevel = w5100_set_msglevel,
607 .get_link = w5100_get_link,
608 .get_regs_len = w5100_get_regs_len,
609 .get_regs = w5100_get_regs,
610 };
611
612 static const struct net_device_ops w5100_netdev_ops = {
613 .ndo_open = w5100_open,
614 .ndo_stop = w5100_stop,
615 .ndo_start_xmit = w5100_start_tx,
616 .ndo_tx_timeout = w5100_tx_timeout,
617 .ndo_set_rx_mode = w5100_set_rx_mode,
618 .ndo_set_mac_address = w5100_set_macaddr,
619 .ndo_validate_addr = eth_validate_addr,
620 .ndo_change_mtu = eth_change_mtu,
621 };
622
623 static int w5100_hw_probe(struct platform_device *pdev)
624 {
625 struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
626 struct net_device *ndev = platform_get_drvdata(pdev);
627 struct w5100_priv *priv = netdev_priv(ndev);
628 const char *name = netdev_name(ndev);
629 struct resource *mem;
630 int mem_size;
631 int irq;
632 int ret;
633
634 if (data && is_valid_ether_addr(data->mac_addr)) {
635 memcpy(ndev->dev_addr, data->mac_addr, ETH_ALEN);
636 } else {
637 eth_hw_addr_random(ndev);
638 }
639
640 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
641 priv->base = devm_ioremap_resource(&pdev->dev, mem);
642 if (IS_ERR(priv->base))
643 return PTR_ERR(priv->base);
644
645 mem_size = resource_size(mem);
646
647 spin_lock_init(&priv->reg_lock);
648 priv->indirect = mem_size < W5100_BUS_DIRECT_SIZE;
649 if (priv->indirect) {
650 priv->read = w5100_read_indirect;
651 priv->write = w5100_write_indirect;
652 priv->read16 = w5100_read16_indirect;
653 priv->write16 = w5100_write16_indirect;
654 priv->readbuf = w5100_readbuf_indirect;
655 priv->writebuf = w5100_writebuf_indirect;
656 } else {
657 priv->read = w5100_read_direct;
658 priv->write = w5100_write_direct;
659 priv->read16 = w5100_read16_direct;
660 priv->write16 = w5100_write16_direct;
661 priv->readbuf = w5100_readbuf_direct;
662 priv->writebuf = w5100_writebuf_direct;
663 }
664
665 w5100_hw_reset(priv);
666 if (w5100_read16(priv, W5100_RTR) != RTR_DEFAULT)
667 return -ENODEV;
668
669 irq = platform_get_irq(pdev, 0);
670 if (irq < 0)
671 return irq;
672 ret = request_irq(irq, w5100_interrupt,
673 IRQ_TYPE_LEVEL_LOW, name, ndev);
674 if (ret < 0)
675 return ret;
676 priv->irq = irq;
677
678 priv->link_gpio = data ? data->link_gpio : -EINVAL;
679 if (gpio_is_valid(priv->link_gpio)) {
680 char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
681 if (!link_name)
682 return -ENOMEM;
683 snprintf(link_name, 16, "%s-link", name);
684 priv->link_irq = gpio_to_irq(priv->link_gpio);
685 if (request_any_context_irq(priv->link_irq, w5100_detect_link,
686 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
687 link_name, priv->ndev) < 0)
688 priv->link_gpio = -EINVAL;
689 }
690
691 netdev_info(ndev, "at 0x%llx irq %d\n", (u64)mem->start, irq);
692 return 0;
693 }
694
695 static int w5100_probe(struct platform_device *pdev)
696 {
697 struct w5100_priv *priv;
698 struct net_device *ndev;
699 int err;
700
701 ndev = alloc_etherdev(sizeof(*priv));
702 if (!ndev)
703 return -ENOMEM;
704 SET_NETDEV_DEV(ndev, &pdev->dev);
705 platform_set_drvdata(pdev, ndev);
706 priv = netdev_priv(ndev);
707 priv->ndev = ndev;
708
709 ndev->netdev_ops = &w5100_netdev_ops;
710 ndev->ethtool_ops = &w5100_ethtool_ops;
711 ndev->watchdog_timeo = HZ;
712 netif_napi_add(ndev, &priv->napi, w5100_napi_poll, 16);
713
714 /* This chip doesn't support VLAN packets with normal MTU,
715 * so disable VLAN for this device.
716 */
717 ndev->features |= NETIF_F_VLAN_CHALLENGED;
718
719 err = register_netdev(ndev);
720 if (err < 0)
721 goto err_register;
722
723 err = w5100_hw_probe(pdev);
724 if (err < 0)
725 goto err_hw_probe;
726
727 return 0;
728
729 err_hw_probe:
730 unregister_netdev(ndev);
731 err_register:
732 free_netdev(ndev);
733 return err;
734 }
735
736 static int w5100_remove(struct platform_device *pdev)
737 {
738 struct net_device *ndev = platform_get_drvdata(pdev);
739 struct w5100_priv *priv = netdev_priv(ndev);
740
741 w5100_hw_reset(priv);
742 free_irq(priv->irq, ndev);
743 if (gpio_is_valid(priv->link_gpio))
744 free_irq(priv->link_irq, ndev);
745
746 unregister_netdev(ndev);
747 free_netdev(ndev);
748 return 0;
749 }
750
751 #ifdef CONFIG_PM_SLEEP
752 static int w5100_suspend(struct device *dev)
753 {
754 struct platform_device *pdev = to_platform_device(dev);
755 struct net_device *ndev = platform_get_drvdata(pdev);
756 struct w5100_priv *priv = netdev_priv(ndev);
757
758 if (netif_running(ndev)) {
759 netif_carrier_off(ndev);
760 netif_device_detach(ndev);
761
762 w5100_hw_close(priv);
763 }
764 return 0;
765 }
766
767 static int w5100_resume(struct device *dev)
768 {
769 struct platform_device *pdev = to_platform_device(dev);
770 struct net_device *ndev = platform_get_drvdata(pdev);
771 struct w5100_priv *priv = netdev_priv(ndev);
772
773 if (netif_running(ndev)) {
774 w5100_hw_reset(priv);
775 w5100_hw_start(priv);
776
777 netif_device_attach(ndev);
778 if (!gpio_is_valid(priv->link_gpio) ||
779 gpio_get_value(priv->link_gpio) != 0)
780 netif_carrier_on(ndev);
781 }
782 return 0;
783 }
784 #endif /* CONFIG_PM_SLEEP */
785
786 static SIMPLE_DEV_PM_OPS(w5100_pm_ops, w5100_suspend, w5100_resume);
787
788 static struct platform_driver w5100_driver = {
789 .driver = {
790 .name = DRV_NAME,
791 .pm = &w5100_pm_ops,
792 },
793 .probe = w5100_probe,
794 .remove = w5100_remove,
795 };
796
797 module_platform_driver(w5100_driver);
Linux with added FPC-III support