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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / ethernet / faraday / ftgmac100.c
blob47f85c337cf75cac6034990e68e978367886a0db
1 /*
2 * Faraday FTGMAC100 Gigabit Ethernet
3 *
4 * (C) Copyright 2009-2011 Faraday Technology
5 * Po-Yu Chuang <ratbert@faraday-tech.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24 #include <linux/dma-mapping.h>
25 #include <linux/etherdevice.h>
26 #include <linux/ethtool.h>
27 #include <linux/init.h>
28 #include <linux/interrupt.h>
29 #include <linux/io.h>
30 #include <linux/module.h>
31 #include <linux/netdevice.h>
32 #include <linux/phy.h>
33 #include <linux/platform_device.h>
34 #include <net/ip.h>
35
36 #include "ftgmac100.h"
37
38 #define DRV_NAME "ftgmac100"
39 #define DRV_VERSION "0.7"
40
41 #define RX_QUEUE_ENTRIES 256 /* must be power of 2 */
42 #define TX_QUEUE_ENTRIES 512 /* must be power of 2 */
43
44 #define MAX_PKT_SIZE 1518
45 #define RX_BUF_SIZE PAGE_SIZE /* must be smaller than 0x3fff */
46
47 /******************************************************************************
48 * private data
49 *****************************************************************************/
50 struct ftgmac100_descs {
51 struct ftgmac100_rxdes rxdes[RX_QUEUE_ENTRIES];
52 struct ftgmac100_txdes txdes[TX_QUEUE_ENTRIES];
53 };
54
55 struct ftgmac100 {
56 struct resource *res;
57 void __iomem *base;
58 int irq;
59
60 struct ftgmac100_descs *descs;
61 dma_addr_t descs_dma_addr;
62
63 unsigned int rx_pointer;
64 unsigned int tx_clean_pointer;
65 unsigned int tx_pointer;
66 unsigned int tx_pending;
67
68 spinlock_t tx_lock;
69
70 struct net_device *netdev;
71 struct device *dev;
72 struct napi_struct napi;
73
74 struct mii_bus *mii_bus;
75 int phy_irq[PHY_MAX_ADDR];
76 struct phy_device *phydev;
77 int old_speed;
78 };
79
80 static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
81 struct ftgmac100_rxdes *rxdes, gfp_t gfp);
82
83 /******************************************************************************
84 * internal functions (hardware register access)
85 *****************************************************************************/
86 #define INT_MASK_ALL_ENABLED (FTGMAC100_INT_RPKT_LOST | \
87 FTGMAC100_INT_XPKT_ETH | \
88 FTGMAC100_INT_XPKT_LOST | \
89 FTGMAC100_INT_AHB_ERR | \
90 FTGMAC100_INT_PHYSTS_CHG | \
91 FTGMAC100_INT_RPKT_BUF | \
92 FTGMAC100_INT_NO_RXBUF)
93
94 static void ftgmac100_set_rx_ring_base(struct ftgmac100 *priv, dma_addr_t addr)
95 {
96 iowrite32(addr, priv->base + FTGMAC100_OFFSET_RXR_BADR);
97 }
98
99 static void ftgmac100_set_rx_buffer_size(struct ftgmac100 *priv,
100 unsigned int size)
101 {
102 size = FTGMAC100_RBSR_SIZE(size);
103 iowrite32(size, priv->base + FTGMAC100_OFFSET_RBSR);
104 }
105
106 static void ftgmac100_set_normal_prio_tx_ring_base(struct ftgmac100 *priv,
107 dma_addr_t addr)
108 {
109 iowrite32(addr, priv->base + FTGMAC100_OFFSET_NPTXR_BADR);
110 }
111
112 static void ftgmac100_txdma_normal_prio_start_polling(struct ftgmac100 *priv)
113 {
114 iowrite32(1, priv->base + FTGMAC100_OFFSET_NPTXPD);
115 }
116
117 static int ftgmac100_reset_hw(struct ftgmac100 *priv)
118 {
119 struct net_device *netdev = priv->netdev;
120 int i;
121
122 /* NOTE: reset clears all registers */
123 iowrite32(FTGMAC100_MACCR_SW_RST, priv->base + FTGMAC100_OFFSET_MACCR);
124 for (i = 0; i < 5; i++) {
125 unsigned int maccr;
126
127 maccr = ioread32(priv->base + FTGMAC100_OFFSET_MACCR);
128 if (!(maccr & FTGMAC100_MACCR_SW_RST))
129 return 0;
130
131 udelay(1000);
132 }
133
134 netdev_err(netdev, "software reset failed\n");
135 return -EIO;
136 }
137
138 static void ftgmac100_set_mac(struct ftgmac100 *priv, const unsigned char *mac)
139 {
140 unsigned int maddr = mac[0] << 8 | mac[1];
141 unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
142
143 iowrite32(maddr, priv->base + FTGMAC100_OFFSET_MAC_MADR);
144 iowrite32(laddr, priv->base + FTGMAC100_OFFSET_MAC_LADR);
145 }
146
147 static void ftgmac100_init_hw(struct ftgmac100 *priv)
148 {
149 /* setup ring buffer base registers */
150 ftgmac100_set_rx_ring_base(priv,
151 priv->descs_dma_addr +
152 offsetof(struct ftgmac100_descs, rxdes));
153 ftgmac100_set_normal_prio_tx_ring_base(priv,
154 priv->descs_dma_addr +
155 offsetof(struct ftgmac100_descs, txdes));
156
157 ftgmac100_set_rx_buffer_size(priv, RX_BUF_SIZE);
158
159 iowrite32(FTGMAC100_APTC_RXPOLL_CNT(1), priv->base + FTGMAC100_OFFSET_APTC);
160
161 ftgmac100_set_mac(priv, priv->netdev->dev_addr);
162 }
163
164 #define MACCR_ENABLE_ALL (FTGMAC100_MACCR_TXDMA_EN | \
165 FTGMAC100_MACCR_RXDMA_EN | \
166 FTGMAC100_MACCR_TXMAC_EN | \
167 FTGMAC100_MACCR_RXMAC_EN | \
168 FTGMAC100_MACCR_FULLDUP | \
169 FTGMAC100_MACCR_CRC_APD | \
170 FTGMAC100_MACCR_RX_RUNT | \
171 FTGMAC100_MACCR_RX_BROADPKT)
172
173 static void ftgmac100_start_hw(struct ftgmac100 *priv, int speed)
174 {
175 int maccr = MACCR_ENABLE_ALL;
176
177 switch (speed) {
178 default:
179 case 10:
180 break;
181
182 case 100:
183 maccr |= FTGMAC100_MACCR_FAST_MODE;
184 break;
185
186 case 1000:
187 maccr |= FTGMAC100_MACCR_GIGA_MODE;
188 break;
189 }
190
191 iowrite32(maccr, priv->base + FTGMAC100_OFFSET_MACCR);
192 }
193
194 static void ftgmac100_stop_hw(struct ftgmac100 *priv)
195 {
196 iowrite32(0, priv->base + FTGMAC100_OFFSET_MACCR);
197 }
198
199 /******************************************************************************
200 * internal functions (receive descriptor)
201 *****************************************************************************/
202 static bool ftgmac100_rxdes_first_segment(struct ftgmac100_rxdes *rxdes)
203 {
204 return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_FRS);
205 }
206
207 static bool ftgmac100_rxdes_last_segment(struct ftgmac100_rxdes *rxdes)
208 {
209 return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_LRS);
210 }
211
212 static bool ftgmac100_rxdes_packet_ready(struct ftgmac100_rxdes *rxdes)
213 {
214 return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RXPKT_RDY);
215 }
216
217 static void ftgmac100_rxdes_set_dma_own(struct ftgmac100_rxdes *rxdes)
218 {
219 /* clear status bits */
220 rxdes->rxdes0 &= cpu_to_le32(FTGMAC100_RXDES0_EDORR);
221 }
222
223 static bool ftgmac100_rxdes_rx_error(struct ftgmac100_rxdes *rxdes)
224 {
225 return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RX_ERR);
226 }
227
228 static bool ftgmac100_rxdes_crc_error(struct ftgmac100_rxdes *rxdes)
229 {
230 return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_CRC_ERR);
231 }
232
233 static bool ftgmac100_rxdes_frame_too_long(struct ftgmac100_rxdes *rxdes)
234 {
235 return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_FTL);
236 }
237
238 static bool ftgmac100_rxdes_runt(struct ftgmac100_rxdes *rxdes)
239 {
240 return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RUNT);
241 }
242
243 static bool ftgmac100_rxdes_odd_nibble(struct ftgmac100_rxdes *rxdes)
244 {
245 return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RX_ODD_NB);
246 }
247
248 static unsigned int ftgmac100_rxdes_data_length(struct ftgmac100_rxdes *rxdes)
249 {
250 return le32_to_cpu(rxdes->rxdes0) & FTGMAC100_RXDES0_VDBC;
251 }
252
253 static bool ftgmac100_rxdes_multicast(struct ftgmac100_rxdes *rxdes)
254 {
255 return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_MULTICAST);
256 }
257
258 static void ftgmac100_rxdes_set_end_of_ring(struct ftgmac100_rxdes *rxdes)
259 {
260 rxdes->rxdes0 |= cpu_to_le32(FTGMAC100_RXDES0_EDORR);
261 }
262
263 static void ftgmac100_rxdes_set_dma_addr(struct ftgmac100_rxdes *rxdes,
264 dma_addr_t addr)
265 {
266 rxdes->rxdes3 = cpu_to_le32(addr);
267 }
268
269 static dma_addr_t ftgmac100_rxdes_get_dma_addr(struct ftgmac100_rxdes *rxdes)
270 {
271 return le32_to_cpu(rxdes->rxdes3);
272 }
273
274 static bool ftgmac100_rxdes_is_tcp(struct ftgmac100_rxdes *rxdes)
275 {
276 return (rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)) ==
277 cpu_to_le32(FTGMAC100_RXDES1_PROT_TCPIP);
278 }
279
280 static bool ftgmac100_rxdes_is_udp(struct ftgmac100_rxdes *rxdes)
281 {
282 return (rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)) ==
283 cpu_to_le32(FTGMAC100_RXDES1_PROT_UDPIP);
284 }
285
286 static bool ftgmac100_rxdes_tcpcs_err(struct ftgmac100_rxdes *rxdes)
287 {
288 return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_TCP_CHKSUM_ERR);
289 }
290
291 static bool ftgmac100_rxdes_udpcs_err(struct ftgmac100_rxdes *rxdes)
292 {
293 return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_UDP_CHKSUM_ERR);
294 }
295
296 static bool ftgmac100_rxdes_ipcs_err(struct ftgmac100_rxdes *rxdes)
297 {
298 return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_IP_CHKSUM_ERR);
299 }
300
301 /*
302 * rxdes2 is not used by hardware. We use it to keep track of page.
303 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
304 */
305 static void ftgmac100_rxdes_set_page(struct ftgmac100_rxdes *rxdes, struct page *page)
306 {
307 rxdes->rxdes2 = (unsigned int)page;
308 }
309
310 static struct page *ftgmac100_rxdes_get_page(struct ftgmac100_rxdes *rxdes)
311 {
312 return (struct page *)rxdes->rxdes2;
313 }
314
315 /******************************************************************************
316 * internal functions (receive)
317 *****************************************************************************/
318 static int ftgmac100_next_rx_pointer(int pointer)
319 {
320 return (pointer + 1) & (RX_QUEUE_ENTRIES - 1);
321 }
322
323 static void ftgmac100_rx_pointer_advance(struct ftgmac100 *priv)
324 {
325 priv->rx_pointer = ftgmac100_next_rx_pointer(priv->rx_pointer);
326 }
327
328 static struct ftgmac100_rxdes *ftgmac100_current_rxdes(struct ftgmac100 *priv)
329 {
330 return &priv->descs->rxdes[priv->rx_pointer];
331 }
332
333 static struct ftgmac100_rxdes *
334 ftgmac100_rx_locate_first_segment(struct ftgmac100 *priv)
335 {
336 struct ftgmac100_rxdes *rxdes = ftgmac100_current_rxdes(priv);
337
338 while (ftgmac100_rxdes_packet_ready(rxdes)) {
339 if (ftgmac100_rxdes_first_segment(rxdes))
340 return rxdes;
341
342 ftgmac100_rxdes_set_dma_own(rxdes);
343 ftgmac100_rx_pointer_advance(priv);
344 rxdes = ftgmac100_current_rxdes(priv);
345 }
346
347 return NULL;
348 }
349
350 static bool ftgmac100_rx_packet_error(struct ftgmac100 *priv,
351 struct ftgmac100_rxdes *rxdes)
352 {
353 struct net_device *netdev = priv->netdev;
354 bool error = false;
355
356 if (unlikely(ftgmac100_rxdes_rx_error(rxdes))) {
357 if (net_ratelimit())
358 netdev_info(netdev, "rx err\n");
359
360 netdev->stats.rx_errors++;
361 error = true;
362 }
363
364 if (unlikely(ftgmac100_rxdes_crc_error(rxdes))) {
365 if (net_ratelimit())
366 netdev_info(netdev, "rx crc err\n");
367
368 netdev->stats.rx_crc_errors++;
369 error = true;
370 } else if (unlikely(ftgmac100_rxdes_ipcs_err(rxdes))) {
371 if (net_ratelimit())
372 netdev_info(netdev, "rx IP checksum err\n");
373
374 error = true;
375 }
376
377 if (unlikely(ftgmac100_rxdes_frame_too_long(rxdes))) {
378 if (net_ratelimit())
379 netdev_info(netdev, "rx frame too long\n");
380
381 netdev->stats.rx_length_errors++;
382 error = true;
383 } else if (unlikely(ftgmac100_rxdes_runt(rxdes))) {
384 if (net_ratelimit())
385 netdev_info(netdev, "rx runt\n");
386
387 netdev->stats.rx_length_errors++;
388 error = true;
389 } else if (unlikely(ftgmac100_rxdes_odd_nibble(rxdes))) {
390 if (net_ratelimit())
391 netdev_info(netdev, "rx odd nibble\n");
392
393 netdev->stats.rx_length_errors++;
394 error = true;
395 }
396
397 return error;
398 }
399
400 static void ftgmac100_rx_drop_packet(struct ftgmac100 *priv)
401 {
402 struct net_device *netdev = priv->netdev;
403 struct ftgmac100_rxdes *rxdes = ftgmac100_current_rxdes(priv);
404 bool done = false;
405
406 if (net_ratelimit())
407 netdev_dbg(netdev, "drop packet %p\n", rxdes);
408
409 do {
410 if (ftgmac100_rxdes_last_segment(rxdes))
411 done = true;
412
413 ftgmac100_rxdes_set_dma_own(rxdes);
414 ftgmac100_rx_pointer_advance(priv);
415 rxdes = ftgmac100_current_rxdes(priv);
416 } while (!done && ftgmac100_rxdes_packet_ready(rxdes));
417
418 netdev->stats.rx_dropped++;
419 }
420
421 static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
422 {
423 struct net_device *netdev = priv->netdev;
424 struct ftgmac100_rxdes *rxdes;
425 struct sk_buff *skb;
426 bool done = false;
427
428 rxdes = ftgmac100_rx_locate_first_segment(priv);
429 if (!rxdes)
430 return false;
431
432 if (unlikely(ftgmac100_rx_packet_error(priv, rxdes))) {
433 ftgmac100_rx_drop_packet(priv);
434 return true;
435 }
436
437 /* start processing */
438 skb = netdev_alloc_skb_ip_align(netdev, 128);
439 if (unlikely(!skb)) {
440 if (net_ratelimit())
441 netdev_err(netdev, "rx skb alloc failed\n");
442
443 ftgmac100_rx_drop_packet(priv);
444 return true;
445 }
446
447 if (unlikely(ftgmac100_rxdes_multicast(rxdes)))
448 netdev->stats.multicast++;
449
450 /*
451 * It seems that HW does checksum incorrectly with fragmented packets,
452 * so we are conservative here - if HW checksum error, let software do
453 * the checksum again.
454 */
455 if ((ftgmac100_rxdes_is_tcp(rxdes) && !ftgmac100_rxdes_tcpcs_err(rxdes)) ||
456 (ftgmac100_rxdes_is_udp(rxdes) && !ftgmac100_rxdes_udpcs_err(rxdes)))
457 skb->ip_summed = CHECKSUM_UNNECESSARY;
458
459 do {
460 dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes);
461 struct page *page = ftgmac100_rxdes_get_page(rxdes);
462 unsigned int size;
463
464 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
465
466 size = ftgmac100_rxdes_data_length(rxdes);
467 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, 0, size);
468
469 skb->len += size;
470 skb->data_len += size;
471 skb->truesize += PAGE_SIZE;
472
473 if (ftgmac100_rxdes_last_segment(rxdes))
474 done = true;
475
476 ftgmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC);
477
478 ftgmac100_rx_pointer_advance(priv);
479 rxdes = ftgmac100_current_rxdes(priv);
480 } while (!done);
481
482 if (skb->len <= 64)
483 skb->truesize -= PAGE_SIZE;
484 __pskb_pull_tail(skb, min(skb->len, 64U));
485 skb->protocol = eth_type_trans(skb, netdev);
486
487 netdev->stats.rx_packets++;
488 netdev->stats.rx_bytes += skb->len;
489
490 /* push packet to protocol stack */
491 napi_gro_receive(&priv->napi, skb);
492
493 (*processed)++;
494 return true;
495 }
496
497 /******************************************************************************
498 * internal functions (transmit descriptor)
499 *****************************************************************************/
500 static void ftgmac100_txdes_reset(struct ftgmac100_txdes *txdes)
501 {
502 /* clear all except end of ring bit */
503 txdes->txdes0 &= cpu_to_le32(FTGMAC100_TXDES0_EDOTR);
504 txdes->txdes1 = 0;
505 txdes->txdes2 = 0;
506 txdes->txdes3 = 0;
507 }
508
509 static bool ftgmac100_txdes_owned_by_dma(struct ftgmac100_txdes *txdes)
510 {
511 return txdes->txdes0 & cpu_to_le32(FTGMAC100_TXDES0_TXDMA_OWN);
512 }
513
514 static void ftgmac100_txdes_set_dma_own(struct ftgmac100_txdes *txdes)
515 {
516 /*
517 * Make sure dma own bit will not be set before any other
518 * descriptor fields.
519 */
520 wmb();
521 txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_TXDMA_OWN);
522 }
523
524 static void ftgmac100_txdes_set_end_of_ring(struct ftgmac100_txdes *txdes)
525 {
526 txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_EDOTR);
527 }
528
529 static void ftgmac100_txdes_set_first_segment(struct ftgmac100_txdes *txdes)
530 {
531 txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_FTS);
532 }
533
534 static void ftgmac100_txdes_set_last_segment(struct ftgmac100_txdes *txdes)
535 {
536 txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_LTS);
537 }
538
539 static void ftgmac100_txdes_set_buffer_size(struct ftgmac100_txdes *txdes,
540 unsigned int len)
541 {
542 txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_TXBUF_SIZE(len));
543 }
544
545 static void ftgmac100_txdes_set_txint(struct ftgmac100_txdes *txdes)
546 {
547 txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_TXIC);
548 }
549
550 static void ftgmac100_txdes_set_tcpcs(struct ftgmac100_txdes *txdes)
551 {
552 txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_TCP_CHKSUM);
553 }
554
555 static void ftgmac100_txdes_set_udpcs(struct ftgmac100_txdes *txdes)
556 {
557 txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_UDP_CHKSUM);
558 }
559
560 static void ftgmac100_txdes_set_ipcs(struct ftgmac100_txdes *txdes)
561 {
562 txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_IP_CHKSUM);
563 }
564
565 static void ftgmac100_txdes_set_dma_addr(struct ftgmac100_txdes *txdes,
566 dma_addr_t addr)
567 {
568 txdes->txdes3 = cpu_to_le32(addr);
569 }
570
571 static dma_addr_t ftgmac100_txdes_get_dma_addr(struct ftgmac100_txdes *txdes)
572 {
573 return le32_to_cpu(txdes->txdes3);
574 }
575
576 /*
577 * txdes2 is not used by hardware. We use it to keep track of socket buffer.
578 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
579 */
580 static void ftgmac100_txdes_set_skb(struct ftgmac100_txdes *txdes,
581 struct sk_buff *skb)
582 {
583 txdes->txdes2 = (unsigned int)skb;
584 }
585
586 static struct sk_buff *ftgmac100_txdes_get_skb(struct ftgmac100_txdes *txdes)
587 {
588 return (struct sk_buff *)txdes->txdes2;
589 }
590
591 /******************************************************************************
592 * internal functions (transmit)
593 *****************************************************************************/
594 static int ftgmac100_next_tx_pointer(int pointer)
595 {
596 return (pointer + 1) & (TX_QUEUE_ENTRIES - 1);
597 }
598
599 static void ftgmac100_tx_pointer_advance(struct ftgmac100 *priv)
600 {
601 priv->tx_pointer = ftgmac100_next_tx_pointer(priv->tx_pointer);
602 }
603
604 static void ftgmac100_tx_clean_pointer_advance(struct ftgmac100 *priv)
605 {
606 priv->tx_clean_pointer = ftgmac100_next_tx_pointer(priv->tx_clean_pointer);
607 }
608
609 static struct ftgmac100_txdes *ftgmac100_current_txdes(struct ftgmac100 *priv)
610 {
611 return &priv->descs->txdes[priv->tx_pointer];
612 }
613
614 static struct ftgmac100_txdes *
615 ftgmac100_current_clean_txdes(struct ftgmac100 *priv)
616 {
617 return &priv->descs->txdes[priv->tx_clean_pointer];
618 }
619
620 static bool ftgmac100_tx_complete_packet(struct ftgmac100 *priv)
621 {
622 struct net_device *netdev = priv->netdev;
623 struct ftgmac100_txdes *txdes;
624 struct sk_buff *skb;
625 dma_addr_t map;
626
627 if (priv->tx_pending == 0)
628 return false;
629
630 txdes = ftgmac100_current_clean_txdes(priv);
631
632 if (ftgmac100_txdes_owned_by_dma(txdes))
633 return false;
634
635 skb = ftgmac100_txdes_get_skb(txdes);
636 map = ftgmac100_txdes_get_dma_addr(txdes);
637
638 netdev->stats.tx_packets++;
639 netdev->stats.tx_bytes += skb->len;
640
641 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
642
643 dev_kfree_skb(skb);
644
645 ftgmac100_txdes_reset(txdes);
646
647 ftgmac100_tx_clean_pointer_advance(priv);
648
649 spin_lock(&priv->tx_lock);
650 priv->tx_pending--;
651 spin_unlock(&priv->tx_lock);
652 netif_wake_queue(netdev);
653
654 return true;
655 }
656
657 static void ftgmac100_tx_complete(struct ftgmac100 *priv)
658 {
659 while (ftgmac100_tx_complete_packet(priv))
660 ;
661 }
662
663 static int ftgmac100_xmit(struct ftgmac100 *priv, struct sk_buff *skb,
664 dma_addr_t map)
665 {
666 struct net_device *netdev = priv->netdev;
667 struct ftgmac100_txdes *txdes;
668 unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
669
670 txdes = ftgmac100_current_txdes(priv);
671 ftgmac100_tx_pointer_advance(priv);
672
673 /* setup TX descriptor */
674 ftgmac100_txdes_set_skb(txdes, skb);
675 ftgmac100_txdes_set_dma_addr(txdes, map);
676 ftgmac100_txdes_set_buffer_size(txdes, len);
677
678 ftgmac100_txdes_set_first_segment(txdes);
679 ftgmac100_txdes_set_last_segment(txdes);
680 ftgmac100_txdes_set_txint(txdes);
681 if (skb->ip_summed == CHECKSUM_PARTIAL) {
682 __be16 protocol = skb->protocol;
683
684 if (protocol == cpu_to_be16(ETH_P_IP)) {
685 u8 ip_proto = ip_hdr(skb)->protocol;
686
687 ftgmac100_txdes_set_ipcs(txdes);
688 if (ip_proto == IPPROTO_TCP)
689 ftgmac100_txdes_set_tcpcs(txdes);
690 else if (ip_proto == IPPROTO_UDP)
691 ftgmac100_txdes_set_udpcs(txdes);
692 }
693 }
694
695 spin_lock(&priv->tx_lock);
696 priv->tx_pending++;
697 if (priv->tx_pending == TX_QUEUE_ENTRIES)
698 netif_stop_queue(netdev);
699
700 /* start transmit */
701 ftgmac100_txdes_set_dma_own(txdes);
702 spin_unlock(&priv->tx_lock);
703
704 ftgmac100_txdma_normal_prio_start_polling(priv);
705
706 return NETDEV_TX_OK;
707 }
708
709 /******************************************************************************
710 * internal functions (buffer)
711 *****************************************************************************/
712 static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
713 struct ftgmac100_rxdes *rxdes, gfp_t gfp)
714 {
715 struct net_device *netdev = priv->netdev;
716 struct page *page;
717 dma_addr_t map;
718
719 page = alloc_page(gfp);
720 if (!page) {
721 if (net_ratelimit())
722 netdev_err(netdev, "failed to allocate rx page\n");
723 return -ENOMEM;
724 }
725
726 map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE);
727 if (unlikely(dma_mapping_error(priv->dev, map))) {
728 if (net_ratelimit())
729 netdev_err(netdev, "failed to map rx page\n");
730 __free_page(page);
731 return -ENOMEM;
732 }
733
734 ftgmac100_rxdes_set_page(rxdes, page);
735 ftgmac100_rxdes_set_dma_addr(rxdes, map);
736 ftgmac100_rxdes_set_dma_own(rxdes);
737 return 0;
738 }
739
740 static void ftgmac100_free_buffers(struct ftgmac100 *priv)
741 {
742 int i;
743
744 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
745 struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i];
746 struct page *page = ftgmac100_rxdes_get_page(rxdes);
747 dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes);
748
749 if (!page)
750 continue;
751
752 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
753 __free_page(page);
754 }
755
756 for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
757 struct ftgmac100_txdes *txdes = &priv->descs->txdes[i];
758 struct sk_buff *skb = ftgmac100_txdes_get_skb(txdes);
759 dma_addr_t map = ftgmac100_txdes_get_dma_addr(txdes);
760
761 if (!skb)
762 continue;
763
764 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
765 dev_kfree_skb(skb);
766 }
767
768 dma_free_coherent(priv->dev, sizeof(struct ftgmac100_descs),
769 priv->descs, priv->descs_dma_addr);
770 }
771
772 static int ftgmac100_alloc_buffers(struct ftgmac100 *priv)
773 {
774 int i;
775
776 priv->descs = dma_alloc_coherent(priv->dev,
777 sizeof(struct ftgmac100_descs),
778 &priv->descs_dma_addr, GFP_KERNEL);
779 if (!priv->descs)
780 return -ENOMEM;
781
782 memset(priv->descs, 0, sizeof(struct ftgmac100_descs));
783
784 /* initialize RX ring */
785 ftgmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
786
787 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
788 struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i];
789
790 if (ftgmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL))
791 goto err;
792 }
793
794 /* initialize TX ring */
795 ftgmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
796 return 0;
797
798 err:
799 ftgmac100_free_buffers(priv);
800 return -ENOMEM;
801 }
802
803 /******************************************************************************
804 * internal functions (mdio)
805 *****************************************************************************/
806 static void ftgmac100_adjust_link(struct net_device *netdev)
807 {
808 struct ftgmac100 *priv = netdev_priv(netdev);
809 struct phy_device *phydev = priv->phydev;
810 int ier;
811
812 if (phydev->speed == priv->old_speed)
813 return;
814
815 priv->old_speed = phydev->speed;
816
817 ier = ioread32(priv->base + FTGMAC100_OFFSET_IER);
818
819 /* disable all interrupts */
820 iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
821
822 netif_stop_queue(netdev);
823 ftgmac100_stop_hw(priv);
824
825 netif_start_queue(netdev);
826 ftgmac100_init_hw(priv);
827 ftgmac100_start_hw(priv, phydev->speed);
828
829 /* re-enable interrupts */
830 iowrite32(ier, priv->base + FTGMAC100_OFFSET_IER);
831 }
832
833 static int ftgmac100_mii_probe(struct ftgmac100 *priv)
834 {
835 struct net_device *netdev = priv->netdev;
836 struct phy_device *phydev = NULL;
837 int i;
838
839 /* search for connect PHY device */
840 for (i = 0; i < PHY_MAX_ADDR; i++) {
841 struct phy_device *tmp = priv->mii_bus->phy_map[i];
842
843 if (tmp) {
844 phydev = tmp;
845 break;
846 }
847 }
848
849 /* now we are supposed to have a proper phydev, to attach to... */
850 if (!phydev) {
851 netdev_info(netdev, "%s: no PHY found\n", netdev->name);
852 return -ENODEV;
853 }
854
855 phydev = phy_connect(netdev, dev_name(&phydev->dev),
856 &ftgmac100_adjust_link, 0,
857 PHY_INTERFACE_MODE_GMII);
858
859 if (IS_ERR(phydev)) {
860 netdev_err(netdev, "%s: Could not attach to PHY\n", netdev->name);
861 return PTR_ERR(phydev);
862 }
863
864 priv->phydev = phydev;
865 return 0;
866 }
867
868 /******************************************************************************
869 * struct mii_bus functions
870 *****************************************************************************/
871 static int ftgmac100_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
872 {
873 struct net_device *netdev = bus->priv;
874 struct ftgmac100 *priv = netdev_priv(netdev);
875 unsigned int phycr;
876 int i;
877
878 phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
879
880 /* preserve MDC cycle threshold */
881 phycr &= FTGMAC100_PHYCR_MDC_CYCTHR_MASK;
882
883 phycr |= FTGMAC100_PHYCR_PHYAD(phy_addr) |
884 FTGMAC100_PHYCR_REGAD(regnum) |
885 FTGMAC100_PHYCR_MIIRD;
886
887 iowrite32(phycr, priv->base + FTGMAC100_OFFSET_PHYCR);
888
889 for (i = 0; i < 10; i++) {
890 phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
891
892 if ((phycr & FTGMAC100_PHYCR_MIIRD) == 0) {
893 int data;
894
895 data = ioread32(priv->base + FTGMAC100_OFFSET_PHYDATA);
896 return FTGMAC100_PHYDATA_MIIRDATA(data);
897 }
898
899 udelay(100);
900 }
901
902 netdev_err(netdev, "mdio read timed out\n");
903 return -EIO;
904 }
905
906 static int ftgmac100_mdiobus_write(struct mii_bus *bus, int phy_addr,
907 int regnum, u16 value)
908 {
909 struct net_device *netdev = bus->priv;
910 struct ftgmac100 *priv = netdev_priv(netdev);
911 unsigned int phycr;
912 int data;
913 int i;
914
915 phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
916
917 /* preserve MDC cycle threshold */
918 phycr &= FTGMAC100_PHYCR_MDC_CYCTHR_MASK;
919
920 phycr |= FTGMAC100_PHYCR_PHYAD(phy_addr) |
921 FTGMAC100_PHYCR_REGAD(regnum) |
922 FTGMAC100_PHYCR_MIIWR;
923
924 data = FTGMAC100_PHYDATA_MIIWDATA(value);
925
926 iowrite32(data, priv->base + FTGMAC100_OFFSET_PHYDATA);
927 iowrite32(phycr, priv->base + FTGMAC100_OFFSET_PHYCR);
928
929 for (i = 0; i < 10; i++) {
930 phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
931
932 if ((phycr & FTGMAC100_PHYCR_MIIWR) == 0)
933 return 0;
934
935 udelay(100);
936 }
937
938 netdev_err(netdev, "mdio write timed out\n");
939 return -EIO;
940 }
941
942 static int ftgmac100_mdiobus_reset(struct mii_bus *bus)
943 {
944 return 0;
945 }
946
947 /******************************************************************************
948 * struct ethtool_ops functions
949 *****************************************************************************/
950 static void ftgmac100_get_drvinfo(struct net_device *netdev,
951 struct ethtool_drvinfo *info)
952 {
953 strcpy(info->driver, DRV_NAME);
954 strcpy(info->version, DRV_VERSION);
955 strcpy(info->bus_info, dev_name(&netdev->dev));
956 }
957
958 static int ftgmac100_get_settings(struct net_device *netdev,
959 struct ethtool_cmd *cmd)
960 {
961 struct ftgmac100 *priv = netdev_priv(netdev);
962
963 return phy_ethtool_gset(priv->phydev, cmd);
964 }
965
966 static int ftgmac100_set_settings(struct net_device *netdev,
967 struct ethtool_cmd *cmd)
968 {
969 struct ftgmac100 *priv = netdev_priv(netdev);
970
971 return phy_ethtool_sset(priv->phydev, cmd);
972 }
973
974 static const struct ethtool_ops ftgmac100_ethtool_ops = {
975 .set_settings = ftgmac100_set_settings,
976 .get_settings = ftgmac100_get_settings,
977 .get_drvinfo = ftgmac100_get_drvinfo,
978 .get_link = ethtool_op_get_link,
979 };
980
981 /******************************************************************************
982 * interrupt handler
983 *****************************************************************************/
984 static irqreturn_t ftgmac100_interrupt(int irq, void *dev_id)
985 {
986 struct net_device *netdev = dev_id;
987 struct ftgmac100 *priv = netdev_priv(netdev);
988
989 if (likely(netif_running(netdev))) {
990 /* Disable interrupts for polling */
991 iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
992 napi_schedule(&priv->napi);
993 }
994
995 return IRQ_HANDLED;
996 }
997
998 /******************************************************************************
999 * struct napi_struct functions
1000 *****************************************************************************/
1001 static int ftgmac100_poll(struct napi_struct *napi, int budget)
1002 {
1003 struct ftgmac100 *priv = container_of(napi, struct ftgmac100, napi);
1004 struct net_device *netdev = priv->netdev;
1005 unsigned int status;
1006 bool completed = true;
1007 int rx = 0;
1008
1009 status = ioread32(priv->base + FTGMAC100_OFFSET_ISR);
1010 iowrite32(status, priv->base + FTGMAC100_OFFSET_ISR);
1011
1012 if (status & (FTGMAC100_INT_RPKT_BUF | FTGMAC100_INT_NO_RXBUF)) {
1013 /*
1014 * FTGMAC100_INT_RPKT_BUF:
1015 * RX DMA has received packets into RX buffer successfully
1016 *
1017 * FTGMAC100_INT_NO_RXBUF:
1018 * RX buffer unavailable
1019 */
1020 bool retry;
1021
1022 do {
1023 retry = ftgmac100_rx_packet(priv, &rx);
1024 } while (retry && rx < budget);
1025
1026 if (retry && rx == budget)
1027 completed = false;
1028 }
1029
1030 if (status & (FTGMAC100_INT_XPKT_ETH | FTGMAC100_INT_XPKT_LOST)) {
1031 /*
1032 * FTGMAC100_INT_XPKT_ETH:
1033 * packet transmitted to ethernet successfully
1034 *
1035 * FTGMAC100_INT_XPKT_LOST:
1036 * packet transmitted to ethernet lost due to late
1037 * collision or excessive collision
1038 */
1039 ftgmac100_tx_complete(priv);
1040 }
1041
1042 if (status & (FTGMAC100_INT_NO_RXBUF | FTGMAC100_INT_RPKT_LOST |
1043 FTGMAC100_INT_AHB_ERR | FTGMAC100_INT_PHYSTS_CHG)) {
1044 if (net_ratelimit())
1045 netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
1046 status & FTGMAC100_INT_NO_RXBUF ? "NO_RXBUF " : "",
1047 status & FTGMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "",
1048 status & FTGMAC100_INT_AHB_ERR ? "AHB_ERR " : "",
1049 status & FTGMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : "");
1050
1051 if (status & FTGMAC100_INT_NO_RXBUF) {
1052 /* RX buffer unavailable */
1053 netdev->stats.rx_over_errors++;
1054 }
1055
1056 if (status & FTGMAC100_INT_RPKT_LOST) {
1057 /* received packet lost due to RX FIFO full */
1058 netdev->stats.rx_fifo_errors++;
1059 }
1060 }
1061
1062 if (completed) {
1063 napi_complete(napi);
1064
1065 /* enable all interrupts */
1066 iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
1067 }
1068
1069 return rx;
1070 }
1071
1072 /******************************************************************************
1073 * struct net_device_ops functions
1074 *****************************************************************************/
1075 static int ftgmac100_open(struct net_device *netdev)
1076 {
1077 struct ftgmac100 *priv = netdev_priv(netdev);
1078 int err;
1079
1080 err = ftgmac100_alloc_buffers(priv);
1081 if (err) {
1082 netdev_err(netdev, "failed to allocate buffers\n");
1083 goto err_alloc;
1084 }
1085
1086 err = request_irq(priv->irq, ftgmac100_interrupt, 0, netdev->name, netdev);
1087 if (err) {
1088 netdev_err(netdev, "failed to request irq %d\n", priv->irq);
1089 goto err_irq;
1090 }
1091
1092 priv->rx_pointer = 0;
1093 priv->tx_clean_pointer = 0;
1094 priv->tx_pointer = 0;
1095 priv->tx_pending = 0;
1096
1097 err = ftgmac100_reset_hw(priv);
1098 if (err)
1099 goto err_hw;
1100
1101 ftgmac100_init_hw(priv);
1102 ftgmac100_start_hw(priv, 10);
1103
1104 phy_start(priv->phydev);
1105
1106 napi_enable(&priv->napi);
1107 netif_start_queue(netdev);
1108
1109 /* enable all interrupts */
1110 iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
1111 return 0;
1112
1113 err_hw:
1114 free_irq(priv->irq, netdev);
1115 err_irq:
1116 ftgmac100_free_buffers(priv);
1117 err_alloc:
1118 return err;
1119 }
1120
1121 static int ftgmac100_stop(struct net_device *netdev)
1122 {
1123 struct ftgmac100 *priv = netdev_priv(netdev);
1124
1125 /* disable all interrupts */
1126 iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
1127
1128 netif_stop_queue(netdev);
1129 napi_disable(&priv->napi);
1130 phy_stop(priv->phydev);
1131
1132 ftgmac100_stop_hw(priv);
1133 free_irq(priv->irq, netdev);
1134 ftgmac100_free_buffers(priv);
1135
1136 return 0;
1137 }
1138
1139 static int ftgmac100_hard_start_xmit(struct sk_buff *skb,
1140 struct net_device *netdev)
1141 {
1142 struct ftgmac100 *priv = netdev_priv(netdev);
1143 dma_addr_t map;
1144
1145 if (unlikely(skb->len > MAX_PKT_SIZE)) {
1146 if (net_ratelimit())
1147 netdev_dbg(netdev, "tx packet too big\n");
1148
1149 netdev->stats.tx_dropped++;
1150 dev_kfree_skb(skb);
1151 return NETDEV_TX_OK;
1152 }
1153
1154 map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
1155 if (unlikely(dma_mapping_error(priv->dev, map))) {
1156 /* drop packet */
1157 if (net_ratelimit())
1158 netdev_err(netdev, "map socket buffer failed\n");
1159
1160 netdev->stats.tx_dropped++;
1161 dev_kfree_skb(skb);
1162 return NETDEV_TX_OK;
1163 }
1164
1165 return ftgmac100_xmit(priv, skb, map);
1166 }
1167
1168 /* optional */
1169 static int ftgmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1170 {
1171 struct ftgmac100 *priv = netdev_priv(netdev);
1172
1173 return phy_mii_ioctl(priv->phydev, ifr, cmd);
1174 }
1175
1176 static const struct net_device_ops ftgmac100_netdev_ops = {
1177 .ndo_open = ftgmac100_open,
1178 .ndo_stop = ftgmac100_stop,
1179 .ndo_start_xmit = ftgmac100_hard_start_xmit,
1180 .ndo_set_mac_address = eth_mac_addr,
1181 .ndo_validate_addr = eth_validate_addr,
1182 .ndo_do_ioctl = ftgmac100_do_ioctl,
1183 };
1184
1185 /******************************************************************************
1186 * struct platform_driver functions
1187 *****************************************************************************/
1188 static int ftgmac100_probe(struct platform_device *pdev)
1189 {
1190 struct resource *res;
1191 int irq;
1192 struct net_device *netdev;
1193 struct ftgmac100 *priv;
1194 int err;
1195 int i;
1196
1197 if (!pdev)
1198 return -ENODEV;
1199
1200 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1201 if (!res)
1202 return -ENXIO;
1203
1204 irq = platform_get_irq(pdev, 0);
1205 if (irq < 0)
1206 return irq;
1207
1208 /* setup net_device */
1209 netdev = alloc_etherdev(sizeof(*priv));
1210 if (!netdev) {
1211 err = -ENOMEM;
1212 goto err_alloc_etherdev;
1213 }
1214
1215 SET_NETDEV_DEV(netdev, &pdev->dev);
1216
1217 SET_ETHTOOL_OPS(netdev, &ftgmac100_ethtool_ops);
1218 netdev->netdev_ops = &ftgmac100_netdev_ops;
1219 netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
1220
1221 platform_set_drvdata(pdev, netdev);
1222
1223 /* setup private data */
1224 priv = netdev_priv(netdev);
1225 priv->netdev = netdev;
1226 priv->dev = &pdev->dev;
1227
1228 spin_lock_init(&priv->tx_lock);
1229
1230 /* initialize NAPI */
1231 netif_napi_add(netdev, &priv->napi, ftgmac100_poll, 64);
1232
1233 /* map io memory */
1234 priv->res = request_mem_region(res->start, resource_size(res),
1235 dev_name(&pdev->dev));
1236 if (!priv->res) {
1237 dev_err(&pdev->dev, "Could not reserve memory region\n");
1238 err = -ENOMEM;
1239 goto err_req_mem;
1240 }
1241
1242 priv->base = ioremap(res->start, resource_size(res));
1243 if (!priv->base) {
1244 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
1245 err = -EIO;
1246 goto err_ioremap;
1247 }
1248
1249 priv->irq = irq;
1250
1251 /* initialize mdio bus */
1252 priv->mii_bus = mdiobus_alloc();
1253 if (!priv->mii_bus) {
1254 err = -EIO;
1255 goto err_alloc_mdiobus;
1256 }
1257
1258 priv->mii_bus->name = "ftgmac100_mdio";
1259 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "ftgmac100_mii");
1260
1261 priv->mii_bus->priv = netdev;
1262 priv->mii_bus->read = ftgmac100_mdiobus_read;
1263 priv->mii_bus->write = ftgmac100_mdiobus_write;
1264 priv->mii_bus->reset = ftgmac100_mdiobus_reset;
1265 priv->mii_bus->irq = priv->phy_irq;
1266
1267 for (i = 0; i < PHY_MAX_ADDR; i++)
1268 priv->mii_bus->irq[i] = PHY_POLL;
1269
1270 err = mdiobus_register(priv->mii_bus);
1271 if (err) {
1272 dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
1273 goto err_register_mdiobus;
1274 }
1275
1276 err = ftgmac100_mii_probe(priv);
1277 if (err) {
1278 dev_err(&pdev->dev, "MII Probe failed!\n");
1279 goto err_mii_probe;
1280 }
1281
1282 /* register network device */
1283 err = register_netdev(netdev);
1284 if (err) {
1285 dev_err(&pdev->dev, "Failed to register netdev\n");
1286 goto err_register_netdev;
1287 }
1288
1289 netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base);
1290
1291 if (!is_valid_ether_addr(netdev->dev_addr)) {
1292 random_ether_addr(netdev->dev_addr);
1293 netdev_info(netdev, "generated random MAC address %pM\n",
1294 netdev->dev_addr);
1295 }
1296
1297 return 0;
1298
1299 err_register_netdev:
1300 phy_disconnect(priv->phydev);
1301 err_mii_probe:
1302 mdiobus_unregister(priv->mii_bus);
1303 err_register_mdiobus:
1304 mdiobus_free(priv->mii_bus);
1305 err_alloc_mdiobus:
1306 iounmap(priv->base);
1307 err_ioremap:
1308 release_resource(priv->res);
1309 err_req_mem:
1310 netif_napi_del(&priv->napi);
1311 platform_set_drvdata(pdev, NULL);
1312 free_netdev(netdev);
1313 err_alloc_etherdev:
1314 return err;
1315 }
1316
1317 static int __exit ftgmac100_remove(struct platform_device *pdev)
1318 {
1319 struct net_device *netdev;
1320 struct ftgmac100 *priv;
1321
1322 netdev = platform_get_drvdata(pdev);
1323 priv = netdev_priv(netdev);
1324
1325 unregister_netdev(netdev);
1326
1327 phy_disconnect(priv->phydev);
1328 mdiobus_unregister(priv->mii_bus);
1329 mdiobus_free(priv->mii_bus);
1330
1331 iounmap(priv->base);
1332 release_resource(priv->res);
1333
1334 netif_napi_del(&priv->napi);
1335 platform_set_drvdata(pdev, NULL);
1336 free_netdev(netdev);
1337 return 0;
1338 }
1339
1340 static struct platform_driver ftgmac100_driver = {
1341 .probe = ftgmac100_probe,
1342 .remove = __exit_p(ftgmac100_remove),
1343 .driver = {
1344 .name = DRV_NAME,
1345 .owner = THIS_MODULE,
1346 },
1347 };
1348
1349 /******************************************************************************
1350 * initialization / finalization
1351 *****************************************************************************/
1352 static int __init ftgmac100_init(void)
1353 {
1354 pr_info("Loading version " DRV_VERSION " ...\n");
1355 return platform_driver_register(&ftgmac100_driver);
1356 }
1357
1358 static void __exit ftgmac100_exit(void)
1359 {
1360 platform_driver_unregister(&ftgmac100_driver);
1361 }
1362
1363 module_init(ftgmac100_init);
1364 module_exit(ftgmac100_exit);
1365
1366 MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");
1367 MODULE_DESCRIPTION("FTGMAC100 driver");
1368 MODULE_LICENSE("GPL");