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Merge tag 'for-linus-20190516' of git://git.kernel.dk/linux-block
[mirror_ubuntu-focal-kernel.git] / drivers / net / ethernet / cirrus / 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 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
13
14 #include <linux/dma-mapping.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/netdevice.h>
18 #include <linux/mii.h>
19 #include <linux/etherdevice.h>
20 #include <linux/ethtool.h>
21 #include <linux/interrupt.h>
22 #include <linux/moduleparam.h>
23 #include <linux/platform_device.h>
24 #include <linux/delay.h>
25 #include <linux/io.h>
26 #include <linux/slab.h>
27
28 #include <linux/platform_data/eth-ep93xx.h>
29
30 #define DRV_MODULE_NAME "ep93xx-eth"
31 #define DRV_MODULE_VERSION "0.1"
32
33 #define RX_QUEUE_ENTRIES 64
34 #define TX_QUEUE_ENTRIES 8
35
36 #define MAX_PKT_SIZE 2044
37 #define PKT_BUF_SIZE 2048
38
39 #define REG_RXCTL 0x0000
40 #define REG_RXCTL_DEFAULT 0x00073800
41 #define REG_TXCTL 0x0004
42 #define REG_TXCTL_ENABLE 0x00000001
43 #define REG_MIICMD 0x0010
44 #define REG_MIICMD_READ 0x00008000
45 #define REG_MIICMD_WRITE 0x00004000
46 #define REG_MIIDATA 0x0014
47 #define REG_MIISTS 0x0018
48 #define REG_MIISTS_BUSY 0x00000001
49 #define REG_SELFCTL 0x0020
50 #define REG_SELFCTL_RESET 0x00000001
51 #define REG_INTEN 0x0024
52 #define REG_INTEN_TX 0x00000008
53 #define REG_INTEN_RX 0x00000007
54 #define REG_INTSTSP 0x0028
55 #define REG_INTSTS_TX 0x00000008
56 #define REG_INTSTS_RX 0x00000004
57 #define REG_INTSTSC 0x002c
58 #define REG_AFP 0x004c
59 #define REG_INDAD0 0x0050
60 #define REG_INDAD1 0x0051
61 #define REG_INDAD2 0x0052
62 #define REG_INDAD3 0x0053
63 #define REG_INDAD4 0x0054
64 #define REG_INDAD5 0x0055
65 #define REG_GIINTMSK 0x0064
66 #define REG_GIINTMSK_ENABLE 0x00008000
67 #define REG_BMCTL 0x0080
68 #define REG_BMCTL_ENABLE_TX 0x00000100
69 #define REG_BMCTL_ENABLE_RX 0x00000001
70 #define REG_BMSTS 0x0084
71 #define REG_BMSTS_RX_ACTIVE 0x00000008
72 #define REG_RXDQBADD 0x0090
73 #define REG_RXDQBLEN 0x0094
74 #define REG_RXDCURADD 0x0098
75 #define REG_RXDENQ 0x009c
76 #define REG_RXSTSQBADD 0x00a0
77 #define REG_RXSTSQBLEN 0x00a4
78 #define REG_RXSTSQCURADD 0x00a8
79 #define REG_RXSTSENQ 0x00ac
80 #define REG_TXDQBADD 0x00b0
81 #define REG_TXDQBLEN 0x00b4
82 #define REG_TXDQCURADD 0x00b8
83 #define REG_TXDENQ 0x00bc
84 #define REG_TXSTSQBADD 0x00c0
85 #define REG_TXSTSQBLEN 0x00c4
86 #define REG_TXSTSQCURADD 0x00c8
87 #define REG_MAXFRMLEN 0x00e8
88
89 struct ep93xx_rdesc
90 {
91 u32 buf_addr;
92 u32 rdesc1;
93 };
94
95 #define RDESC1_NSOF 0x80000000
96 #define RDESC1_BUFFER_INDEX 0x7fff0000
97 #define RDESC1_BUFFER_LENGTH 0x0000ffff
98
99 struct ep93xx_rstat
100 {
101 u32 rstat0;
102 u32 rstat1;
103 };
104
105 #define RSTAT0_RFP 0x80000000
106 #define RSTAT0_RWE 0x40000000
107 #define RSTAT0_EOF 0x20000000
108 #define RSTAT0_EOB 0x10000000
109 #define RSTAT0_AM 0x00c00000
110 #define RSTAT0_RX_ERR 0x00200000
111 #define RSTAT0_OE 0x00100000
112 #define RSTAT0_FE 0x00080000
113 #define RSTAT0_RUNT 0x00040000
114 #define RSTAT0_EDATA 0x00020000
115 #define RSTAT0_CRCE 0x00010000
116 #define RSTAT0_CRCI 0x00008000
117 #define RSTAT0_HTI 0x00003f00
118 #define RSTAT1_RFP 0x80000000
119 #define RSTAT1_BUFFER_INDEX 0x7fff0000
120 #define RSTAT1_FRAME_LENGTH 0x0000ffff
121
122 struct ep93xx_tdesc
123 {
124 u32 buf_addr;
125 u32 tdesc1;
126 };
127
128 #define TDESC1_EOF 0x80000000
129 #define TDESC1_BUFFER_INDEX 0x7fff0000
130 #define TDESC1_BUFFER_ABORT 0x00008000
131 #define TDESC1_BUFFER_LENGTH 0x00000fff
132
133 struct ep93xx_tstat
134 {
135 u32 tstat0;
136 };
137
138 #define TSTAT0_TXFP 0x80000000
139 #define TSTAT0_TXWE 0x40000000
140 #define TSTAT0_FA 0x20000000
141 #define TSTAT0_LCRS 0x10000000
142 #define TSTAT0_OW 0x04000000
143 #define TSTAT0_TXU 0x02000000
144 #define TSTAT0_ECOLL 0x01000000
145 #define TSTAT0_NCOLL 0x001f0000
146 #define TSTAT0_BUFFER_INDEX 0x00007fff
147
148 struct ep93xx_descs
149 {
150 struct ep93xx_rdesc rdesc[RX_QUEUE_ENTRIES];
151 struct ep93xx_tdesc tdesc[TX_QUEUE_ENTRIES];
152 struct ep93xx_rstat rstat[RX_QUEUE_ENTRIES];
153 struct ep93xx_tstat tstat[TX_QUEUE_ENTRIES];
154 };
155
156 struct ep93xx_priv
157 {
158 struct resource *res;
159 void __iomem *base_addr;
160 int irq;
161
162 struct ep93xx_descs *descs;
163 dma_addr_t descs_dma_addr;
164
165 void *rx_buf[RX_QUEUE_ENTRIES];
166 void *tx_buf[TX_QUEUE_ENTRIES];
167
168 spinlock_t rx_lock;
169 unsigned int rx_pointer;
170 unsigned int tx_clean_pointer;
171 unsigned int tx_pointer;
172 spinlock_t tx_pending_lock;
173 unsigned int tx_pending;
174
175 struct net_device *dev;
176 struct napi_struct napi;
177
178 struct mii_if_info mii;
179 u8 mdc_divisor;
180 };
181
182 #define rdb(ep, off) __raw_readb((ep)->base_addr + (off))
183 #define rdw(ep, off) __raw_readw((ep)->base_addr + (off))
184 #define rdl(ep, off) __raw_readl((ep)->base_addr + (off))
185 #define wrb(ep, off, val) __raw_writeb((val), (ep)->base_addr + (off))
186 #define wrw(ep, off, val) __raw_writew((val), (ep)->base_addr + (off))
187 #define wrl(ep, off, val) __raw_writel((val), (ep)->base_addr + (off))
188
189 static int ep93xx_mdio_read(struct net_device *dev, int phy_id, int reg)
190 {
191 struct ep93xx_priv *ep = netdev_priv(dev);
192 int data;
193 int i;
194
195 wrl(ep, REG_MIICMD, REG_MIICMD_READ | (phy_id << 5) | reg);
196
197 for (i = 0; i < 10; i++) {
198 if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
199 break;
200 msleep(1);
201 }
202
203 if (i == 10) {
204 pr_info("mdio read timed out\n");
205 data = 0xffff;
206 } else {
207 data = rdl(ep, REG_MIIDATA);
208 }
209
210 return data;
211 }
212
213 static void ep93xx_mdio_write(struct net_device *dev, int phy_id, int reg, int data)
214 {
215 struct ep93xx_priv *ep = netdev_priv(dev);
216 int i;
217
218 wrl(ep, REG_MIIDATA, data);
219 wrl(ep, REG_MIICMD, REG_MIICMD_WRITE | (phy_id << 5) | reg);
220
221 for (i = 0; i < 10; i++) {
222 if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
223 break;
224 msleep(1);
225 }
226
227 if (i == 10)
228 pr_info("mdio write timed out\n");
229 }
230
231 static int ep93xx_rx(struct net_device *dev, int budget)
232 {
233 struct ep93xx_priv *ep = netdev_priv(dev);
234 int processed = 0;
235
236 while (processed < budget) {
237 int entry;
238 struct ep93xx_rstat *rstat;
239 u32 rstat0;
240 u32 rstat1;
241 int length;
242 struct sk_buff *skb;
243
244 entry = ep->rx_pointer;
245 rstat = ep->descs->rstat + entry;
246
247 rstat0 = rstat->rstat0;
248 rstat1 = rstat->rstat1;
249 if (!(rstat0 & RSTAT0_RFP) || !(rstat1 & RSTAT1_RFP))
250 break;
251
252 rstat->rstat0 = 0;
253 rstat->rstat1 = 0;
254
255 if (!(rstat0 & RSTAT0_EOF))
256 pr_crit("not end-of-frame %.8x %.8x\n", rstat0, rstat1);
257 if (!(rstat0 & RSTAT0_EOB))
258 pr_crit("not end-of-buffer %.8x %.8x\n", rstat0, rstat1);
259 if ((rstat1 & RSTAT1_BUFFER_INDEX) >> 16 != entry)
260 pr_crit("entry mismatch %.8x %.8x\n", rstat0, rstat1);
261
262 if (!(rstat0 & RSTAT0_RWE)) {
263 dev->stats.rx_errors++;
264 if (rstat0 & RSTAT0_OE)
265 dev->stats.rx_fifo_errors++;
266 if (rstat0 & RSTAT0_FE)
267 dev->stats.rx_frame_errors++;
268 if (rstat0 & (RSTAT0_RUNT | RSTAT0_EDATA))
269 dev->stats.rx_length_errors++;
270 if (rstat0 & RSTAT0_CRCE)
271 dev->stats.rx_crc_errors++;
272 goto err;
273 }
274
275 length = rstat1 & RSTAT1_FRAME_LENGTH;
276 if (length > MAX_PKT_SIZE) {
277 pr_notice("invalid length %.8x %.8x\n", rstat0, rstat1);
278 goto err;
279 }
280
281 /* Strip FCS. */
282 if (rstat0 & RSTAT0_CRCI)
283 length -= 4;
284
285 skb = netdev_alloc_skb(dev, length + 2);
286 if (likely(skb != NULL)) {
287 struct ep93xx_rdesc *rxd = &ep->descs->rdesc[entry];
288 skb_reserve(skb, 2);
289 dma_sync_single_for_cpu(dev->dev.parent, rxd->buf_addr,
290 length, DMA_FROM_DEVICE);
291 skb_copy_to_linear_data(skb, ep->rx_buf[entry], length);
292 dma_sync_single_for_device(dev->dev.parent,
293 rxd->buf_addr, length,
294 DMA_FROM_DEVICE);
295 skb_put(skb, length);
296 skb->protocol = eth_type_trans(skb, dev);
297
298 napi_gro_receive(&ep->napi, skb);
299
300 dev->stats.rx_packets++;
301 dev->stats.rx_bytes += length;
302 } else {
303 dev->stats.rx_dropped++;
304 }
305
306 err:
307 ep->rx_pointer = (entry + 1) & (RX_QUEUE_ENTRIES - 1);
308 processed++;
309 }
310
311 return processed;
312 }
313
314 static int ep93xx_poll(struct napi_struct *napi, int budget)
315 {
316 struct ep93xx_priv *ep = container_of(napi, struct ep93xx_priv, napi);
317 struct net_device *dev = ep->dev;
318 int rx;
319
320 rx = ep93xx_rx(dev, budget);
321 if (rx < budget && napi_complete_done(napi, rx)) {
322 spin_lock_irq(&ep->rx_lock);
323 wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
324 spin_unlock_irq(&ep->rx_lock);
325 }
326
327 if (rx) {
328 wrw(ep, REG_RXDENQ, rx);
329 wrw(ep, REG_RXSTSENQ, rx);
330 }
331
332 return rx;
333 }
334
335 static netdev_tx_t ep93xx_xmit(struct sk_buff *skb, struct net_device *dev)
336 {
337 struct ep93xx_priv *ep = netdev_priv(dev);
338 struct ep93xx_tdesc *txd;
339 int entry;
340
341 if (unlikely(skb->len > MAX_PKT_SIZE)) {
342 dev->stats.tx_dropped++;
343 dev_kfree_skb(skb);
344 return NETDEV_TX_OK;
345 }
346
347 entry = ep->tx_pointer;
348 ep->tx_pointer = (ep->tx_pointer + 1) & (TX_QUEUE_ENTRIES - 1);
349
350 txd = &ep->descs->tdesc[entry];
351
352 txd->tdesc1 = TDESC1_EOF | (entry << 16) | (skb->len & 0xfff);
353 dma_sync_single_for_cpu(dev->dev.parent, txd->buf_addr, skb->len,
354 DMA_TO_DEVICE);
355 skb_copy_and_csum_dev(skb, ep->tx_buf[entry]);
356 dma_sync_single_for_device(dev->dev.parent, txd->buf_addr, skb->len,
357 DMA_TO_DEVICE);
358 dev_kfree_skb(skb);
359
360 spin_lock_irq(&ep->tx_pending_lock);
361 ep->tx_pending++;
362 if (ep->tx_pending == TX_QUEUE_ENTRIES)
363 netif_stop_queue(dev);
364 spin_unlock_irq(&ep->tx_pending_lock);
365
366 wrl(ep, REG_TXDENQ, 1);
367
368 return NETDEV_TX_OK;
369 }
370
371 static void ep93xx_tx_complete(struct net_device *dev)
372 {
373 struct ep93xx_priv *ep = netdev_priv(dev);
374 int wake;
375
376 wake = 0;
377
378 spin_lock(&ep->tx_pending_lock);
379 while (1) {
380 int entry;
381 struct ep93xx_tstat *tstat;
382 u32 tstat0;
383
384 entry = ep->tx_clean_pointer;
385 tstat = ep->descs->tstat + entry;
386
387 tstat0 = tstat->tstat0;
388 if (!(tstat0 & TSTAT0_TXFP))
389 break;
390
391 tstat->tstat0 = 0;
392
393 if (tstat0 & TSTAT0_FA)
394 pr_crit("frame aborted %.8x\n", tstat0);
395 if ((tstat0 & TSTAT0_BUFFER_INDEX) != entry)
396 pr_crit("entry mismatch %.8x\n", tstat0);
397
398 if (tstat0 & TSTAT0_TXWE) {
399 int length = ep->descs->tdesc[entry].tdesc1 & 0xfff;
400
401 dev->stats.tx_packets++;
402 dev->stats.tx_bytes += length;
403 } else {
404 dev->stats.tx_errors++;
405 }
406
407 if (tstat0 & TSTAT0_OW)
408 dev->stats.tx_window_errors++;
409 if (tstat0 & TSTAT0_TXU)
410 dev->stats.tx_fifo_errors++;
411 dev->stats.collisions += (tstat0 >> 16) & 0x1f;
412
413 ep->tx_clean_pointer = (entry + 1) & (TX_QUEUE_ENTRIES - 1);
414 if (ep->tx_pending == TX_QUEUE_ENTRIES)
415 wake = 1;
416 ep->tx_pending--;
417 }
418 spin_unlock(&ep->tx_pending_lock);
419
420 if (wake)
421 netif_wake_queue(dev);
422 }
423
424 static irqreturn_t ep93xx_irq(int irq, void *dev_id)
425 {
426 struct net_device *dev = dev_id;
427 struct ep93xx_priv *ep = netdev_priv(dev);
428 u32 status;
429
430 status = rdl(ep, REG_INTSTSC);
431 if (status == 0)
432 return IRQ_NONE;
433
434 if (status & REG_INTSTS_RX) {
435 spin_lock(&ep->rx_lock);
436 if (likely(napi_schedule_prep(&ep->napi))) {
437 wrl(ep, REG_INTEN, REG_INTEN_TX);
438 __napi_schedule(&ep->napi);
439 }
440 spin_unlock(&ep->rx_lock);
441 }
442
443 if (status & REG_INTSTS_TX)
444 ep93xx_tx_complete(dev);
445
446 return IRQ_HANDLED;
447 }
448
449 static void ep93xx_free_buffers(struct ep93xx_priv *ep)
450 {
451 struct device *dev = ep->dev->dev.parent;
452 int i;
453
454 if (!ep->descs)
455 return;
456
457 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
458 dma_addr_t d;
459
460 d = ep->descs->rdesc[i].buf_addr;
461 if (d)
462 dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_FROM_DEVICE);
463
464 kfree(ep->rx_buf[i]);
465 }
466
467 for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
468 dma_addr_t d;
469
470 d = ep->descs->tdesc[i].buf_addr;
471 if (d)
472 dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_TO_DEVICE);
473
474 kfree(ep->tx_buf[i]);
475 }
476
477 dma_free_coherent(dev, sizeof(struct ep93xx_descs), ep->descs,
478 ep->descs_dma_addr);
479 ep->descs = NULL;
480 }
481
482 static int ep93xx_alloc_buffers(struct ep93xx_priv *ep)
483 {
484 struct device *dev = ep->dev->dev.parent;
485 int i;
486
487 ep->descs = dma_alloc_coherent(dev, sizeof(struct ep93xx_descs),
488 &ep->descs_dma_addr, GFP_KERNEL);
489 if (ep->descs == NULL)
490 return 1;
491
492 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
493 void *buf;
494 dma_addr_t d;
495
496 buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL);
497 if (buf == NULL)
498 goto err;
499
500 d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_FROM_DEVICE);
501 if (dma_mapping_error(dev, d)) {
502 kfree(buf);
503 goto err;
504 }
505
506 ep->rx_buf[i] = buf;
507 ep->descs->rdesc[i].buf_addr = d;
508 ep->descs->rdesc[i].rdesc1 = (i << 16) | PKT_BUF_SIZE;
509 }
510
511 for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
512 void *buf;
513 dma_addr_t d;
514
515 buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL);
516 if (buf == NULL)
517 goto err;
518
519 d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_TO_DEVICE);
520 if (dma_mapping_error(dev, d)) {
521 kfree(buf);
522 goto err;
523 }
524
525 ep->tx_buf[i] = buf;
526 ep->descs->tdesc[i].buf_addr = d;
527 }
528
529 return 0;
530
531 err:
532 ep93xx_free_buffers(ep);
533 return 1;
534 }
535
536 static int ep93xx_start_hw(struct net_device *dev)
537 {
538 struct ep93xx_priv *ep = netdev_priv(dev);
539 unsigned long addr;
540 int i;
541
542 wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
543 for (i = 0; i < 10; i++) {
544 if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
545 break;
546 msleep(1);
547 }
548
549 if (i == 10) {
550 pr_crit("hw failed to reset\n");
551 return 1;
552 }
553
554 wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9));
555
556 /* Does the PHY support preamble suppress? */
557 if ((ep93xx_mdio_read(dev, ep->mii.phy_id, MII_BMSR) & 0x0040) != 0)
558 wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9) | (1 << 8));
559
560 /* Receive descriptor ring. */
561 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rdesc);
562 wrl(ep, REG_RXDQBADD, addr);
563 wrl(ep, REG_RXDCURADD, addr);
564 wrw(ep, REG_RXDQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rdesc));
565
566 /* Receive status ring. */
567 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rstat);
568 wrl(ep, REG_RXSTSQBADD, addr);
569 wrl(ep, REG_RXSTSQCURADD, addr);
570 wrw(ep, REG_RXSTSQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rstat));
571
572 /* Transmit descriptor ring. */
573 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tdesc);
574 wrl(ep, REG_TXDQBADD, addr);
575 wrl(ep, REG_TXDQCURADD, addr);
576 wrw(ep, REG_TXDQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tdesc));
577
578 /* Transmit status ring. */
579 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tstat);
580 wrl(ep, REG_TXSTSQBADD, addr);
581 wrl(ep, REG_TXSTSQCURADD, addr);
582 wrw(ep, REG_TXSTSQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tstat));
583
584 wrl(ep, REG_BMCTL, REG_BMCTL_ENABLE_TX | REG_BMCTL_ENABLE_RX);
585 wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
586 wrl(ep, REG_GIINTMSK, 0);
587
588 for (i = 0; i < 10; i++) {
589 if ((rdl(ep, REG_BMSTS) & REG_BMSTS_RX_ACTIVE) != 0)
590 break;
591 msleep(1);
592 }
593
594 if (i == 10) {
595 pr_crit("hw failed to start\n");
596 return 1;
597 }
598
599 wrl(ep, REG_RXDENQ, RX_QUEUE_ENTRIES);
600 wrl(ep, REG_RXSTSENQ, RX_QUEUE_ENTRIES);
601
602 wrb(ep, REG_INDAD0, dev->dev_addr[0]);
603 wrb(ep, REG_INDAD1, dev->dev_addr[1]);
604 wrb(ep, REG_INDAD2, dev->dev_addr[2]);
605 wrb(ep, REG_INDAD3, dev->dev_addr[3]);
606 wrb(ep, REG_INDAD4, dev->dev_addr[4]);
607 wrb(ep, REG_INDAD5, dev->dev_addr[5]);
608 wrl(ep, REG_AFP, 0);
609
610 wrl(ep, REG_MAXFRMLEN, (MAX_PKT_SIZE << 16) | MAX_PKT_SIZE);
611
612 wrl(ep, REG_RXCTL, REG_RXCTL_DEFAULT);
613 wrl(ep, REG_TXCTL, REG_TXCTL_ENABLE);
614
615 return 0;
616 }
617
618 static void ep93xx_stop_hw(struct net_device *dev)
619 {
620 struct ep93xx_priv *ep = netdev_priv(dev);
621 int i;
622
623 wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
624 for (i = 0; i < 10; i++) {
625 if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
626 break;
627 msleep(1);
628 }
629
630 if (i == 10)
631 pr_crit("hw failed to reset\n");
632 }
633
634 static int ep93xx_open(struct net_device *dev)
635 {
636 struct ep93xx_priv *ep = netdev_priv(dev);
637 int err;
638
639 if (ep93xx_alloc_buffers(ep))
640 return -ENOMEM;
641
642 napi_enable(&ep->napi);
643
644 if (ep93xx_start_hw(dev)) {
645 napi_disable(&ep->napi);
646 ep93xx_free_buffers(ep);
647 return -EIO;
648 }
649
650 spin_lock_init(&ep->rx_lock);
651 ep->rx_pointer = 0;
652 ep->tx_clean_pointer = 0;
653 ep->tx_pointer = 0;
654 spin_lock_init(&ep->tx_pending_lock);
655 ep->tx_pending = 0;
656
657 err = request_irq(ep->irq, ep93xx_irq, IRQF_SHARED, dev->name, dev);
658 if (err) {
659 napi_disable(&ep->napi);
660 ep93xx_stop_hw(dev);
661 ep93xx_free_buffers(ep);
662 return err;
663 }
664
665 wrl(ep, REG_GIINTMSK, REG_GIINTMSK_ENABLE);
666
667 netif_start_queue(dev);
668
669 return 0;
670 }
671
672 static int ep93xx_close(struct net_device *dev)
673 {
674 struct ep93xx_priv *ep = netdev_priv(dev);
675
676 napi_disable(&ep->napi);
677 netif_stop_queue(dev);
678
679 wrl(ep, REG_GIINTMSK, 0);
680 free_irq(ep->irq, dev);
681 ep93xx_stop_hw(dev);
682 ep93xx_free_buffers(ep);
683
684 return 0;
685 }
686
687 static int ep93xx_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
688 {
689 struct ep93xx_priv *ep = netdev_priv(dev);
690 struct mii_ioctl_data *data = if_mii(ifr);
691
692 return generic_mii_ioctl(&ep->mii, data, cmd, NULL);
693 }
694
695 static void ep93xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
696 {
697 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
698 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
699 }
700
701 static int ep93xx_get_link_ksettings(struct net_device *dev,
702 struct ethtool_link_ksettings *cmd)
703 {
704 struct ep93xx_priv *ep = netdev_priv(dev);
705
706 mii_ethtool_get_link_ksettings(&ep->mii, cmd);
707
708 return 0;
709 }
710
711 static int ep93xx_set_link_ksettings(struct net_device *dev,
712 const struct ethtool_link_ksettings *cmd)
713 {
714 struct ep93xx_priv *ep = netdev_priv(dev);
715 return mii_ethtool_set_link_ksettings(&ep->mii, cmd);
716 }
717
718 static int ep93xx_nway_reset(struct net_device *dev)
719 {
720 struct ep93xx_priv *ep = netdev_priv(dev);
721 return mii_nway_restart(&ep->mii);
722 }
723
724 static u32 ep93xx_get_link(struct net_device *dev)
725 {
726 struct ep93xx_priv *ep = netdev_priv(dev);
727 return mii_link_ok(&ep->mii);
728 }
729
730 static const struct ethtool_ops ep93xx_ethtool_ops = {
731 .get_drvinfo = ep93xx_get_drvinfo,
732 .nway_reset = ep93xx_nway_reset,
733 .get_link = ep93xx_get_link,
734 .get_link_ksettings = ep93xx_get_link_ksettings,
735 .set_link_ksettings = ep93xx_set_link_ksettings,
736 };
737
738 static const struct net_device_ops ep93xx_netdev_ops = {
739 .ndo_open = ep93xx_open,
740 .ndo_stop = ep93xx_close,
741 .ndo_start_xmit = ep93xx_xmit,
742 .ndo_do_ioctl = ep93xx_ioctl,
743 .ndo_validate_addr = eth_validate_addr,
744 .ndo_set_mac_address = eth_mac_addr,
745 };
746
747 static struct net_device *ep93xx_dev_alloc(struct ep93xx_eth_data *data)
748 {
749 struct net_device *dev;
750
751 dev = alloc_etherdev(sizeof(struct ep93xx_priv));
752 if (dev == NULL)
753 return NULL;
754
755 memcpy(dev->dev_addr, data->dev_addr, ETH_ALEN);
756
757 dev->ethtool_ops = &ep93xx_ethtool_ops;
758 dev->netdev_ops = &ep93xx_netdev_ops;
759
760 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
761
762 return dev;
763 }
764
765
766 static int ep93xx_eth_remove(struct platform_device *pdev)
767 {
768 struct net_device *dev;
769 struct ep93xx_priv *ep;
770
771 dev = platform_get_drvdata(pdev);
772 if (dev == NULL)
773 return 0;
774
775 ep = netdev_priv(dev);
776
777 /* @@@ Force down. */
778 unregister_netdev(dev);
779 ep93xx_free_buffers(ep);
780
781 if (ep->base_addr != NULL)
782 iounmap(ep->base_addr);
783
784 if (ep->res != NULL) {
785 release_resource(ep->res);
786 kfree(ep->res);
787 }
788
789 free_netdev(dev);
790
791 return 0;
792 }
793
794 static int ep93xx_eth_probe(struct platform_device *pdev)
795 {
796 struct ep93xx_eth_data *data;
797 struct net_device *dev;
798 struct ep93xx_priv *ep;
799 struct resource *mem;
800 int irq;
801 int err;
802
803 if (pdev == NULL)
804 return -ENODEV;
805 data = dev_get_platdata(&pdev->dev);
806
807 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
808 irq = platform_get_irq(pdev, 0);
809 if (!mem || irq < 0)
810 return -ENXIO;
811
812 dev = ep93xx_dev_alloc(data);
813 if (dev == NULL) {
814 err = -ENOMEM;
815 goto err_out;
816 }
817 ep = netdev_priv(dev);
818 ep->dev = dev;
819 SET_NETDEV_DEV(dev, &pdev->dev);
820 netif_napi_add(dev, &ep->napi, ep93xx_poll, 64);
821
822 platform_set_drvdata(pdev, dev);
823
824 ep->res = request_mem_region(mem->start, resource_size(mem),
825 dev_name(&pdev->dev));
826 if (ep->res == NULL) {
827 dev_err(&pdev->dev, "Could not reserve memory region\n");
828 err = -ENOMEM;
829 goto err_out;
830 }
831
832 ep->base_addr = ioremap(mem->start, resource_size(mem));
833 if (ep->base_addr == NULL) {
834 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
835 err = -EIO;
836 goto err_out;
837 }
838 ep->irq = irq;
839
840 ep->mii.phy_id = data->phy_id;
841 ep->mii.phy_id_mask = 0x1f;
842 ep->mii.reg_num_mask = 0x1f;
843 ep->mii.dev = dev;
844 ep->mii.mdio_read = ep93xx_mdio_read;
845 ep->mii.mdio_write = ep93xx_mdio_write;
846 ep->mdc_divisor = 40; /* Max HCLK 100 MHz, min MDIO clk 2.5 MHz. */
847
848 if (is_zero_ether_addr(dev->dev_addr))
849 eth_hw_addr_random(dev);
850
851 err = register_netdev(dev);
852 if (err) {
853 dev_err(&pdev->dev, "Failed to register netdev\n");
854 goto err_out;
855 }
856
857 printk(KERN_INFO "%s: ep93xx on-chip ethernet, IRQ %d, %pM\n",
858 dev->name, ep->irq, dev->dev_addr);
859
860 return 0;
861
862 err_out:
863 ep93xx_eth_remove(pdev);
864 return err;
865 }
866
867
868 static struct platform_driver ep93xx_eth_driver = {
869 .probe = ep93xx_eth_probe,
870 .remove = ep93xx_eth_remove,
871 .driver = {
872 .name = "ep93xx-eth",
873 },
874 };
875
876 module_platform_driver(ep93xx_eth_driver);
877
878 MODULE_LICENSE("GPL");
879 MODULE_ALIAS("platform:ep93xx-eth");
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