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net: Remove redundant NAPI functions
[deliverable/linux.git] / drivers / net / arm / ep93xx_eth.c
1 /*
2 * EP93xx ethernet network device driver
3 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
4 * Dedicated to Marija Kulikova.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #include <linux/dma-mapping.h>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/netdevice.h>
16 #include <linux/mii.h>
17 #include <linux/etherdevice.h>
18 #include <linux/ethtool.h>
19 #include <linux/init.h>
20 #include <linux/moduleparam.h>
21 #include <linux/platform_device.h>
22 #include <linux/delay.h>
23 #include <mach/ep93xx-regs.h>
24 #include <mach/platform.h>
25 #include <asm/io.h>
26
27 #define DRV_MODULE_NAME "ep93xx-eth"
28 #define DRV_MODULE_VERSION "0.1"
29
30 #define RX_QUEUE_ENTRIES 64
31 #define TX_QUEUE_ENTRIES 8
32
33 #define MAX_PKT_SIZE 2044
34 #define PKT_BUF_SIZE 2048
35
36 #define REG_RXCTL 0x0000
37 #define REG_RXCTL_DEFAULT 0x00073800
38 #define REG_TXCTL 0x0004
39 #define REG_TXCTL_ENABLE 0x00000001
40 #define REG_MIICMD 0x0010
41 #define REG_MIICMD_READ 0x00008000
42 #define REG_MIICMD_WRITE 0x00004000
43 #define REG_MIIDATA 0x0014
44 #define REG_MIISTS 0x0018
45 #define REG_MIISTS_BUSY 0x00000001
46 #define REG_SELFCTL 0x0020
47 #define REG_SELFCTL_RESET 0x00000001
48 #define REG_INTEN 0x0024
49 #define REG_INTEN_TX 0x00000008
50 #define REG_INTEN_RX 0x00000007
51 #define REG_INTSTSP 0x0028
52 #define REG_INTSTS_TX 0x00000008
53 #define REG_INTSTS_RX 0x00000004
54 #define REG_INTSTSC 0x002c
55 #define REG_AFP 0x004c
56 #define REG_INDAD0 0x0050
57 #define REG_INDAD1 0x0051
58 #define REG_INDAD2 0x0052
59 #define REG_INDAD3 0x0053
60 #define REG_INDAD4 0x0054
61 #define REG_INDAD5 0x0055
62 #define REG_GIINTMSK 0x0064
63 #define REG_GIINTMSK_ENABLE 0x00008000
64 #define REG_BMCTL 0x0080
65 #define REG_BMCTL_ENABLE_TX 0x00000100
66 #define REG_BMCTL_ENABLE_RX 0x00000001
67 #define REG_BMSTS 0x0084
68 #define REG_BMSTS_RX_ACTIVE 0x00000008
69 #define REG_RXDQBADD 0x0090
70 #define REG_RXDQBLEN 0x0094
71 #define REG_RXDCURADD 0x0098
72 #define REG_RXDENQ 0x009c
73 #define REG_RXSTSQBADD 0x00a0
74 #define REG_RXSTSQBLEN 0x00a4
75 #define REG_RXSTSQCURADD 0x00a8
76 #define REG_RXSTSENQ 0x00ac
77 #define REG_TXDQBADD 0x00b0
78 #define REG_TXDQBLEN 0x00b4
79 #define REG_TXDQCURADD 0x00b8
80 #define REG_TXDENQ 0x00bc
81 #define REG_TXSTSQBADD 0x00c0
82 #define REG_TXSTSQBLEN 0x00c4
83 #define REG_TXSTSQCURADD 0x00c8
84 #define REG_MAXFRMLEN 0x00e8
85
86 struct ep93xx_rdesc
87 {
88 u32 buf_addr;
89 u32 rdesc1;
90 };
91
92 #define RDESC1_NSOF 0x80000000
93 #define RDESC1_BUFFER_INDEX 0x7fff0000
94 #define RDESC1_BUFFER_LENGTH 0x0000ffff
95
96 struct ep93xx_rstat
97 {
98 u32 rstat0;
99 u32 rstat1;
100 };
101
102 #define RSTAT0_RFP 0x80000000
103 #define RSTAT0_RWE 0x40000000
104 #define RSTAT0_EOF 0x20000000
105 #define RSTAT0_EOB 0x10000000
106 #define RSTAT0_AM 0x00c00000
107 #define RSTAT0_RX_ERR 0x00200000
108 #define RSTAT0_OE 0x00100000
109 #define RSTAT0_FE 0x00080000
110 #define RSTAT0_RUNT 0x00040000
111 #define RSTAT0_EDATA 0x00020000
112 #define RSTAT0_CRCE 0x00010000
113 #define RSTAT0_CRCI 0x00008000
114 #define RSTAT0_HTI 0x00003f00
115 #define RSTAT1_RFP 0x80000000
116 #define RSTAT1_BUFFER_INDEX 0x7fff0000
117 #define RSTAT1_FRAME_LENGTH 0x0000ffff
118
119 struct ep93xx_tdesc
120 {
121 u32 buf_addr;
122 u32 tdesc1;
123 };
124
125 #define TDESC1_EOF 0x80000000
126 #define TDESC1_BUFFER_INDEX 0x7fff0000
127 #define TDESC1_BUFFER_ABORT 0x00008000
128 #define TDESC1_BUFFER_LENGTH 0x00000fff
129
130 struct ep93xx_tstat
131 {
132 u32 tstat0;
133 };
134
135 #define TSTAT0_TXFP 0x80000000
136 #define TSTAT0_TXWE 0x40000000
137 #define TSTAT0_FA 0x20000000
138 #define TSTAT0_LCRS 0x10000000
139 #define TSTAT0_OW 0x04000000
140 #define TSTAT0_TXU 0x02000000
141 #define TSTAT0_ECOLL 0x01000000
142 #define TSTAT0_NCOLL 0x001f0000
143 #define TSTAT0_BUFFER_INDEX 0x00007fff
144
145 struct ep93xx_descs
146 {
147 struct ep93xx_rdesc rdesc[RX_QUEUE_ENTRIES];
148 struct ep93xx_tdesc tdesc[TX_QUEUE_ENTRIES];
149 struct ep93xx_rstat rstat[RX_QUEUE_ENTRIES];
150 struct ep93xx_tstat tstat[TX_QUEUE_ENTRIES];
151 };
152
153 struct ep93xx_priv
154 {
155 struct resource *res;
156 void *base_addr;
157 int irq;
158
159 struct ep93xx_descs *descs;
160 dma_addr_t descs_dma_addr;
161
162 void *rx_buf[RX_QUEUE_ENTRIES];
163 void *tx_buf[TX_QUEUE_ENTRIES];
164
165 spinlock_t rx_lock;
166 unsigned int rx_pointer;
167 unsigned int tx_clean_pointer;
168 unsigned int tx_pointer;
169 spinlock_t tx_pending_lock;
170 unsigned int tx_pending;
171
172 struct net_device *dev;
173 struct napi_struct napi;
174
175 struct net_device_stats stats;
176
177 struct mii_if_info mii;
178 u8 mdc_divisor;
179 };
180
181 #define rdb(ep, off) __raw_readb((ep)->base_addr + (off))
182 #define rdw(ep, off) __raw_readw((ep)->base_addr + (off))
183 #define rdl(ep, off) __raw_readl((ep)->base_addr + (off))
184 #define wrb(ep, off, val) __raw_writeb((val), (ep)->base_addr + (off))
185 #define wrw(ep, off, val) __raw_writew((val), (ep)->base_addr + (off))
186 #define wrl(ep, off, val) __raw_writel((val), (ep)->base_addr + (off))
187
188 static int ep93xx_mdio_read(struct net_device *dev, int phy_id, int reg);
189
190 static struct net_device_stats *ep93xx_get_stats(struct net_device *dev)
191 {
192 struct ep93xx_priv *ep = netdev_priv(dev);
193 return &(ep->stats);
194 }
195
196 static int ep93xx_rx(struct net_device *dev, int processed, int budget)
197 {
198 struct ep93xx_priv *ep = netdev_priv(dev);
199
200 while (processed < budget) {
201 int entry;
202 struct ep93xx_rstat *rstat;
203 u32 rstat0;
204 u32 rstat1;
205 int length;
206 struct sk_buff *skb;
207
208 entry = ep->rx_pointer;
209 rstat = ep->descs->rstat + entry;
210
211 rstat0 = rstat->rstat0;
212 rstat1 = rstat->rstat1;
213 if (!(rstat0 & RSTAT0_RFP) || !(rstat1 & RSTAT1_RFP))
214 break;
215
216 rstat->rstat0 = 0;
217 rstat->rstat1 = 0;
218
219 if (!(rstat0 & RSTAT0_EOF))
220 printk(KERN_CRIT "ep93xx_rx: not end-of-frame "
221 " %.8x %.8x\n", rstat0, rstat1);
222 if (!(rstat0 & RSTAT0_EOB))
223 printk(KERN_CRIT "ep93xx_rx: not end-of-buffer "
224 " %.8x %.8x\n", rstat0, rstat1);
225 if ((rstat1 & RSTAT1_BUFFER_INDEX) >> 16 != entry)
226 printk(KERN_CRIT "ep93xx_rx: entry mismatch "
227 " %.8x %.8x\n", rstat0, rstat1);
228
229 if (!(rstat0 & RSTAT0_RWE)) {
230 ep->stats.rx_errors++;
231 if (rstat0 & RSTAT0_OE)
232 ep->stats.rx_fifo_errors++;
233 if (rstat0 & RSTAT0_FE)
234 ep->stats.rx_frame_errors++;
235 if (rstat0 & (RSTAT0_RUNT | RSTAT0_EDATA))
236 ep->stats.rx_length_errors++;
237 if (rstat0 & RSTAT0_CRCE)
238 ep->stats.rx_crc_errors++;
239 goto err;
240 }
241
242 length = rstat1 & RSTAT1_FRAME_LENGTH;
243 if (length > MAX_PKT_SIZE) {
244 printk(KERN_NOTICE "ep93xx_rx: invalid length "
245 " %.8x %.8x\n", rstat0, rstat1);
246 goto err;
247 }
248
249 /* Strip FCS. */
250 if (rstat0 & RSTAT0_CRCI)
251 length -= 4;
252
253 skb = dev_alloc_skb(length + 2);
254 if (likely(skb != NULL)) {
255 skb_reserve(skb, 2);
256 dma_sync_single(NULL, ep->descs->rdesc[entry].buf_addr,
257 length, DMA_FROM_DEVICE);
258 skb_copy_to_linear_data(skb, ep->rx_buf[entry], length);
259 skb_put(skb, length);
260 skb->protocol = eth_type_trans(skb, dev);
261
262 netif_receive_skb(skb);
263
264 ep->stats.rx_packets++;
265 ep->stats.rx_bytes += length;
266 } else {
267 ep->stats.rx_dropped++;
268 }
269
270 err:
271 ep->rx_pointer = (entry + 1) & (RX_QUEUE_ENTRIES - 1);
272 processed++;
273 }
274
275 if (processed) {
276 wrw(ep, REG_RXDENQ, processed);
277 wrw(ep, REG_RXSTSENQ, processed);
278 }
279
280 return processed;
281 }
282
283 static int ep93xx_have_more_rx(struct ep93xx_priv *ep)
284 {
285 struct ep93xx_rstat *rstat = ep->descs->rstat + ep->rx_pointer;
286 return !!((rstat->rstat0 & RSTAT0_RFP) && (rstat->rstat1 & RSTAT1_RFP));
287 }
288
289 static int ep93xx_poll(struct napi_struct *napi, int budget)
290 {
291 struct ep93xx_priv *ep = container_of(napi, struct ep93xx_priv, napi);
292 struct net_device *dev = ep->dev;
293 int rx = 0;
294
295 poll_some_more:
296 rx = ep93xx_rx(dev, rx, budget);
297 if (rx < budget) {
298 int more = 0;
299
300 spin_lock_irq(&ep->rx_lock);
301 __napi_complete(napi);
302 wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
303 if (ep93xx_have_more_rx(ep)) {
304 wrl(ep, REG_INTEN, REG_INTEN_TX);
305 wrl(ep, REG_INTSTSP, REG_INTSTS_RX);
306 more = 1;
307 }
308 spin_unlock_irq(&ep->rx_lock);
309
310 if (more && napi_reschedule(napi))
311 goto poll_some_more;
312 }
313
314 return rx;
315 }
316
317 static int ep93xx_xmit(struct sk_buff *skb, struct net_device *dev)
318 {
319 struct ep93xx_priv *ep = netdev_priv(dev);
320 int entry;
321
322 if (unlikely(skb->len > MAX_PKT_SIZE)) {
323 ep->stats.tx_dropped++;
324 dev_kfree_skb(skb);
325 return NETDEV_TX_OK;
326 }
327
328 entry = ep->tx_pointer;
329 ep->tx_pointer = (ep->tx_pointer + 1) & (TX_QUEUE_ENTRIES - 1);
330
331 ep->descs->tdesc[entry].tdesc1 =
332 TDESC1_EOF | (entry << 16) | (skb->len & 0xfff);
333 skb_copy_and_csum_dev(skb, ep->tx_buf[entry]);
334 dma_sync_single(NULL, ep->descs->tdesc[entry].buf_addr,
335 skb->len, DMA_TO_DEVICE);
336 dev_kfree_skb(skb);
337
338 dev->trans_start = jiffies;
339
340 spin_lock_irq(&ep->tx_pending_lock);
341 ep->tx_pending++;
342 if (ep->tx_pending == TX_QUEUE_ENTRIES)
343 netif_stop_queue(dev);
344 spin_unlock_irq(&ep->tx_pending_lock);
345
346 wrl(ep, REG_TXDENQ, 1);
347
348 return NETDEV_TX_OK;
349 }
350
351 static void ep93xx_tx_complete(struct net_device *dev)
352 {
353 struct ep93xx_priv *ep = netdev_priv(dev);
354 int wake;
355
356 wake = 0;
357
358 spin_lock(&ep->tx_pending_lock);
359 while (1) {
360 int entry;
361 struct ep93xx_tstat *tstat;
362 u32 tstat0;
363
364 entry = ep->tx_clean_pointer;
365 tstat = ep->descs->tstat + entry;
366
367 tstat0 = tstat->tstat0;
368 if (!(tstat0 & TSTAT0_TXFP))
369 break;
370
371 tstat->tstat0 = 0;
372
373 if (tstat0 & TSTAT0_FA)
374 printk(KERN_CRIT "ep93xx_tx_complete: frame aborted "
375 " %.8x\n", tstat0);
376 if ((tstat0 & TSTAT0_BUFFER_INDEX) != entry)
377 printk(KERN_CRIT "ep93xx_tx_complete: entry mismatch "
378 " %.8x\n", tstat0);
379
380 if (tstat0 & TSTAT0_TXWE) {
381 int length = ep->descs->tdesc[entry].tdesc1 & 0xfff;
382
383 ep->stats.tx_packets++;
384 ep->stats.tx_bytes += length;
385 } else {
386 ep->stats.tx_errors++;
387 }
388
389 if (tstat0 & TSTAT0_OW)
390 ep->stats.tx_window_errors++;
391 if (tstat0 & TSTAT0_TXU)
392 ep->stats.tx_fifo_errors++;
393 ep->stats.collisions += (tstat0 >> 16) & 0x1f;
394
395 ep->tx_clean_pointer = (entry + 1) & (TX_QUEUE_ENTRIES - 1);
396 if (ep->tx_pending == TX_QUEUE_ENTRIES)
397 wake = 1;
398 ep->tx_pending--;
399 }
400 spin_unlock(&ep->tx_pending_lock);
401
402 if (wake)
403 netif_wake_queue(dev);
404 }
405
406 static irqreturn_t ep93xx_irq(int irq, void *dev_id)
407 {
408 struct net_device *dev = dev_id;
409 struct ep93xx_priv *ep = netdev_priv(dev);
410 u32 status;
411
412 status = rdl(ep, REG_INTSTSC);
413 if (status == 0)
414 return IRQ_NONE;
415
416 if (status & REG_INTSTS_RX) {
417 spin_lock(&ep->rx_lock);
418 if (likely(napi_schedule_prep(&ep->napi))) {
419 wrl(ep, REG_INTEN, REG_INTEN_TX);
420 __napi_schedule(&ep->napi);
421 }
422 spin_unlock(&ep->rx_lock);
423 }
424
425 if (status & REG_INTSTS_TX)
426 ep93xx_tx_complete(dev);
427
428 return IRQ_HANDLED;
429 }
430
431 static void ep93xx_free_buffers(struct ep93xx_priv *ep)
432 {
433 int i;
434
435 for (i = 0; i < RX_QUEUE_ENTRIES; i += 2) {
436 dma_addr_t d;
437
438 d = ep->descs->rdesc[i].buf_addr;
439 if (d)
440 dma_unmap_single(NULL, d, PAGE_SIZE, DMA_FROM_DEVICE);
441
442 if (ep->rx_buf[i] != NULL)
443 free_page((unsigned long)ep->rx_buf[i]);
444 }
445
446 for (i = 0; i < TX_QUEUE_ENTRIES; i += 2) {
447 dma_addr_t d;
448
449 d = ep->descs->tdesc[i].buf_addr;
450 if (d)
451 dma_unmap_single(NULL, d, PAGE_SIZE, DMA_TO_DEVICE);
452
453 if (ep->tx_buf[i] != NULL)
454 free_page((unsigned long)ep->tx_buf[i]);
455 }
456
457 dma_free_coherent(NULL, sizeof(struct ep93xx_descs), ep->descs,
458 ep->descs_dma_addr);
459 }
460
461 /*
462 * The hardware enforces a sub-2K maximum packet size, so we put
463 * two buffers on every hardware page.
464 */
465 static int ep93xx_alloc_buffers(struct ep93xx_priv *ep)
466 {
467 int i;
468
469 ep->descs = dma_alloc_coherent(NULL, sizeof(struct ep93xx_descs),
470 &ep->descs_dma_addr, GFP_KERNEL | GFP_DMA);
471 if (ep->descs == NULL)
472 return 1;
473
474 for (i = 0; i < RX_QUEUE_ENTRIES; i += 2) {
475 void *page;
476 dma_addr_t d;
477
478 page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
479 if (page == NULL)
480 goto err;
481
482 d = dma_map_single(NULL, page, PAGE_SIZE, DMA_FROM_DEVICE);
483 if (dma_mapping_error(NULL, d)) {
484 free_page((unsigned long)page);
485 goto err;
486 }
487
488 ep->rx_buf[i] = page;
489 ep->descs->rdesc[i].buf_addr = d;
490 ep->descs->rdesc[i].rdesc1 = (i << 16) | PKT_BUF_SIZE;
491
492 ep->rx_buf[i + 1] = page + PKT_BUF_SIZE;
493 ep->descs->rdesc[i + 1].buf_addr = d + PKT_BUF_SIZE;
494 ep->descs->rdesc[i + 1].rdesc1 = ((i + 1) << 16) | PKT_BUF_SIZE;
495 }
496
497 for (i = 0; i < TX_QUEUE_ENTRIES; i += 2) {
498 void *page;
499 dma_addr_t d;
500
501 page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
502 if (page == NULL)
503 goto err;
504
505 d = dma_map_single(NULL, page, PAGE_SIZE, DMA_TO_DEVICE);
506 if (dma_mapping_error(NULL, d)) {
507 free_page((unsigned long)page);
508 goto err;
509 }
510
511 ep->tx_buf[i] = page;
512 ep->descs->tdesc[i].buf_addr = d;
513
514 ep->tx_buf[i + 1] = page + PKT_BUF_SIZE;
515 ep->descs->tdesc[i + 1].buf_addr = d + PKT_BUF_SIZE;
516 }
517
518 return 0;
519
520 err:
521 ep93xx_free_buffers(ep);
522 return 1;
523 }
524
525 static int ep93xx_start_hw(struct net_device *dev)
526 {
527 struct ep93xx_priv *ep = netdev_priv(dev);
528 unsigned long addr;
529 int i;
530
531 wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
532 for (i = 0; i < 10; i++) {
533 if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
534 break;
535 msleep(1);
536 }
537
538 if (i == 10) {
539 printk(KERN_CRIT DRV_MODULE_NAME ": hw failed to reset\n");
540 return 1;
541 }
542
543 wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9));
544
545 /* Does the PHY support preamble suppress? */
546 if ((ep93xx_mdio_read(dev, ep->mii.phy_id, MII_BMSR) & 0x0040) != 0)
547 wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9) | (1 << 8));
548
549 /* Receive descriptor ring. */
550 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rdesc);
551 wrl(ep, REG_RXDQBADD, addr);
552 wrl(ep, REG_RXDCURADD, addr);
553 wrw(ep, REG_RXDQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rdesc));
554
555 /* Receive status ring. */
556 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rstat);
557 wrl(ep, REG_RXSTSQBADD, addr);
558 wrl(ep, REG_RXSTSQCURADD, addr);
559 wrw(ep, REG_RXSTSQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rstat));
560
561 /* Transmit descriptor ring. */
562 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tdesc);
563 wrl(ep, REG_TXDQBADD, addr);
564 wrl(ep, REG_TXDQCURADD, addr);
565 wrw(ep, REG_TXDQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tdesc));
566
567 /* Transmit status ring. */
568 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tstat);
569 wrl(ep, REG_TXSTSQBADD, addr);
570 wrl(ep, REG_TXSTSQCURADD, addr);
571 wrw(ep, REG_TXSTSQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tstat));
572
573 wrl(ep, REG_BMCTL, REG_BMCTL_ENABLE_TX | REG_BMCTL_ENABLE_RX);
574 wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
575 wrl(ep, REG_GIINTMSK, 0);
576
577 for (i = 0; i < 10; i++) {
578 if ((rdl(ep, REG_BMSTS) & REG_BMSTS_RX_ACTIVE) != 0)
579 break;
580 msleep(1);
581 }
582
583 if (i == 10) {
584 printk(KERN_CRIT DRV_MODULE_NAME ": hw failed to start\n");
585 return 1;
586 }
587
588 wrl(ep, REG_RXDENQ, RX_QUEUE_ENTRIES);
589 wrl(ep, REG_RXSTSENQ, RX_QUEUE_ENTRIES);
590
591 wrb(ep, REG_INDAD0, dev->dev_addr[0]);
592 wrb(ep, REG_INDAD1, dev->dev_addr[1]);
593 wrb(ep, REG_INDAD2, dev->dev_addr[2]);
594 wrb(ep, REG_INDAD3, dev->dev_addr[3]);
595 wrb(ep, REG_INDAD4, dev->dev_addr[4]);
596 wrb(ep, REG_INDAD5, dev->dev_addr[5]);
597 wrl(ep, REG_AFP, 0);
598
599 wrl(ep, REG_MAXFRMLEN, (MAX_PKT_SIZE << 16) | MAX_PKT_SIZE);
600
601 wrl(ep, REG_RXCTL, REG_RXCTL_DEFAULT);
602 wrl(ep, REG_TXCTL, REG_TXCTL_ENABLE);
603
604 return 0;
605 }
606
607 static void ep93xx_stop_hw(struct net_device *dev)
608 {
609 struct ep93xx_priv *ep = netdev_priv(dev);
610 int i;
611
612 wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
613 for (i = 0; i < 10; i++) {
614 if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
615 break;
616 msleep(1);
617 }
618
619 if (i == 10)
620 printk(KERN_CRIT DRV_MODULE_NAME ": hw failed to reset\n");
621 }
622
623 static int ep93xx_open(struct net_device *dev)
624 {
625 struct ep93xx_priv *ep = netdev_priv(dev);
626 int err;
627
628 if (ep93xx_alloc_buffers(ep))
629 return -ENOMEM;
630
631 if (is_zero_ether_addr(dev->dev_addr)) {
632 random_ether_addr(dev->dev_addr);
633 printk(KERN_INFO "%s: generated random MAC address "
634 "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", dev->name,
635 dev->dev_addr[0], dev->dev_addr[1],
636 dev->dev_addr[2], dev->dev_addr[3],
637 dev->dev_addr[4], dev->dev_addr[5]);
638 }
639
640 napi_enable(&ep->napi);
641
642 if (ep93xx_start_hw(dev)) {
643 napi_disable(&ep->napi);
644 ep93xx_free_buffers(ep);
645 return -EIO;
646 }
647
648 spin_lock_init(&ep->rx_lock);
649 ep->rx_pointer = 0;
650 ep->tx_clean_pointer = 0;
651 ep->tx_pointer = 0;
652 spin_lock_init(&ep->tx_pending_lock);
653 ep->tx_pending = 0;
654
655 err = request_irq(ep->irq, ep93xx_irq, IRQF_SHARED, dev->name, dev);
656 if (err) {
657 napi_disable(&ep->napi);
658 ep93xx_stop_hw(dev);
659 ep93xx_free_buffers(ep);
660 return err;
661 }
662
663 wrl(ep, REG_GIINTMSK, REG_GIINTMSK_ENABLE);
664
665 netif_start_queue(dev);
666
667 return 0;
668 }
669
670 static int ep93xx_close(struct net_device *dev)
671 {
672 struct ep93xx_priv *ep = netdev_priv(dev);
673
674 napi_disable(&ep->napi);
675 netif_stop_queue(dev);
676
677 wrl(ep, REG_GIINTMSK, 0);
678 free_irq(ep->irq, dev);
679 ep93xx_stop_hw(dev);
680 ep93xx_free_buffers(ep);
681
682 return 0;
683 }
684
685 static int ep93xx_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
686 {
687 struct ep93xx_priv *ep = netdev_priv(dev);
688 struct mii_ioctl_data *data = if_mii(ifr);
689
690 return generic_mii_ioctl(&ep->mii, data, cmd, NULL);
691 }
692
693 static int ep93xx_mdio_read(struct net_device *dev, int phy_id, int reg)
694 {
695 struct ep93xx_priv *ep = netdev_priv(dev);
696 int data;
697 int i;
698
699 wrl(ep, REG_MIICMD, REG_MIICMD_READ | (phy_id << 5) | reg);
700
701 for (i = 0; i < 10; i++) {
702 if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
703 break;
704 msleep(1);
705 }
706
707 if (i == 10) {
708 printk(KERN_INFO DRV_MODULE_NAME ": mdio read timed out\n");
709 data = 0xffff;
710 } else {
711 data = rdl(ep, REG_MIIDATA);
712 }
713
714 return data;
715 }
716
717 static void ep93xx_mdio_write(struct net_device *dev, int phy_id, int reg, int data)
718 {
719 struct ep93xx_priv *ep = netdev_priv(dev);
720 int i;
721
722 wrl(ep, REG_MIIDATA, data);
723 wrl(ep, REG_MIICMD, REG_MIICMD_WRITE | (phy_id << 5) | reg);
724
725 for (i = 0; i < 10; i++) {
726 if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
727 break;
728 msleep(1);
729 }
730
731 if (i == 10)
732 printk(KERN_INFO DRV_MODULE_NAME ": mdio write timed out\n");
733 }
734
735 static void ep93xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
736 {
737 strcpy(info->driver, DRV_MODULE_NAME);
738 strcpy(info->version, DRV_MODULE_VERSION);
739 }
740
741 static int ep93xx_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
742 {
743 struct ep93xx_priv *ep = netdev_priv(dev);
744 return mii_ethtool_gset(&ep->mii, cmd);
745 }
746
747 static int ep93xx_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
748 {
749 struct ep93xx_priv *ep = netdev_priv(dev);
750 return mii_ethtool_sset(&ep->mii, cmd);
751 }
752
753 static int ep93xx_nway_reset(struct net_device *dev)
754 {
755 struct ep93xx_priv *ep = netdev_priv(dev);
756 return mii_nway_restart(&ep->mii);
757 }
758
759 static u32 ep93xx_get_link(struct net_device *dev)
760 {
761 struct ep93xx_priv *ep = netdev_priv(dev);
762 return mii_link_ok(&ep->mii);
763 }
764
765 static struct ethtool_ops ep93xx_ethtool_ops = {
766 .get_drvinfo = ep93xx_get_drvinfo,
767 .get_settings = ep93xx_get_settings,
768 .set_settings = ep93xx_set_settings,
769 .nway_reset = ep93xx_nway_reset,
770 .get_link = ep93xx_get_link,
771 };
772
773 struct net_device *ep93xx_dev_alloc(struct ep93xx_eth_data *data)
774 {
775 struct net_device *dev;
776
777 dev = alloc_etherdev(sizeof(struct ep93xx_priv));
778 if (dev == NULL)
779 return NULL;
780
781 memcpy(dev->dev_addr, data->dev_addr, ETH_ALEN);
782
783 dev->get_stats = ep93xx_get_stats;
784 dev->ethtool_ops = &ep93xx_ethtool_ops;
785 dev->hard_start_xmit = ep93xx_xmit;
786 dev->open = ep93xx_open;
787 dev->stop = ep93xx_close;
788 dev->do_ioctl = ep93xx_ioctl;
789
790 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
791
792 return dev;
793 }
794
795
796 static int ep93xx_eth_remove(struct platform_device *pdev)
797 {
798 struct net_device *dev;
799 struct ep93xx_priv *ep;
800
801 dev = platform_get_drvdata(pdev);
802 if (dev == NULL)
803 return 0;
804 platform_set_drvdata(pdev, NULL);
805
806 ep = netdev_priv(dev);
807
808 /* @@@ Force down. */
809 unregister_netdev(dev);
810 ep93xx_free_buffers(ep);
811
812 if (ep->base_addr != NULL)
813 iounmap(ep->base_addr);
814
815 if (ep->res != NULL) {
816 release_resource(ep->res);
817 kfree(ep->res);
818 }
819
820 free_netdev(dev);
821
822 return 0;
823 }
824
825 static int ep93xx_eth_probe(struct platform_device *pdev)
826 {
827 struct ep93xx_eth_data *data;
828 struct net_device *dev;
829 struct ep93xx_priv *ep;
830 int err;
831
832 if (pdev == NULL)
833 return -ENODEV;
834 data = pdev->dev.platform_data;
835
836 dev = ep93xx_dev_alloc(data);
837 if (dev == NULL) {
838 err = -ENOMEM;
839 goto err_out;
840 }
841 ep = netdev_priv(dev);
842 ep->dev = dev;
843 netif_napi_add(dev, &ep->napi, ep93xx_poll, 64);
844
845 platform_set_drvdata(pdev, dev);
846
847 ep->res = request_mem_region(pdev->resource[0].start,
848 pdev->resource[0].end - pdev->resource[0].start + 1,
849 dev_name(&pdev->dev));
850 if (ep->res == NULL) {
851 dev_err(&pdev->dev, "Could not reserve memory region\n");
852 err = -ENOMEM;
853 goto err_out;
854 }
855
856 ep->base_addr = ioremap(pdev->resource[0].start,
857 pdev->resource[0].end - pdev->resource[0].start);
858 if (ep->base_addr == NULL) {
859 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
860 err = -EIO;
861 goto err_out;
862 }
863 ep->irq = pdev->resource[1].start;
864
865 ep->mii.phy_id = data->phy_id;
866 ep->mii.phy_id_mask = 0x1f;
867 ep->mii.reg_num_mask = 0x1f;
868 ep->mii.dev = dev;
869 ep->mii.mdio_read = ep93xx_mdio_read;
870 ep->mii.mdio_write = ep93xx_mdio_write;
871 ep->mdc_divisor = 40; /* Max HCLK 100 MHz, min MDIO clk 2.5 MHz. */
872
873 err = register_netdev(dev);
874 if (err) {
875 dev_err(&pdev->dev, "Failed to register netdev\n");
876 goto err_out;
877 }
878
879 printk(KERN_INFO "%s: ep93xx on-chip ethernet, IRQ %d, "
880 "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", dev->name,
881 ep->irq, data->dev_addr[0], data->dev_addr[1],
882 data->dev_addr[2], data->dev_addr[3],
883 data->dev_addr[4], data->dev_addr[5]);
884
885 return 0;
886
887 err_out:
888 ep93xx_eth_remove(pdev);
889 return err;
890 }
891
892
893 static struct platform_driver ep93xx_eth_driver = {
894 .probe = ep93xx_eth_probe,
895 .remove = ep93xx_eth_remove,
896 .driver = {
897 .name = "ep93xx-eth",
898 .owner = THIS_MODULE,
899 },
900 };
901
902 static int __init ep93xx_eth_init_module(void)
903 {
904 printk(KERN_INFO DRV_MODULE_NAME " version " DRV_MODULE_VERSION " loading\n");
905 return platform_driver_register(&ep93xx_eth_driver);
906 }
907
908 static void __exit ep93xx_eth_cleanup_module(void)
909 {
910 platform_driver_unregister(&ep93xx_eth_driver);
911 }
912
913 module_init(ep93xx_eth_init_module);
914 module_exit(ep93xx_eth_cleanup_module);
915 MODULE_LICENSE("GPL");
916 MODULE_ALIAS("platform:ep93xx-eth");
Linux kernel - Deliverables
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