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