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Linux 6.13-rc6
[linux.git] / drivers / net / ethernet / faraday / ftmac100.c
blob5803a382f0ba65550a2305d31288c6f4ceb5b98e
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Faraday FTMAC100 10/100 Ethernet
4 *
5 * (C) Copyright 2009-2011 Faraday Technology
6 * Po-Yu Chuang <ratbert@faraday-tech.com>
7 */
8
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11 #include <linux/dma-mapping.h>
12 #include <linux/etherdevice.h>
13 #include <linux/ethtool.h>
14 #include <linux/if_ether.h>
15 #include <linux/if_vlan.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/mii.h>
20 #include <linux/module.h>
21 #include <linux/mod_devicetable.h>
22 #include <linux/netdevice.h>
23 #include <linux/platform_device.h>
24
25 #include "ftmac100.h"
26
27 #define DRV_NAME "ftmac100"
28
29 #define RX_QUEUE_ENTRIES 128 /* must be power of 2 */
30 #define TX_QUEUE_ENTRIES 16 /* must be power of 2 */
31
32 #define RX_BUF_SIZE 2044 /* must be smaller than 0x7ff */
33 #define MAX_PKT_SIZE RX_BUF_SIZE /* multi-segment not supported */
34
35 #if MAX_PKT_SIZE > 0x7ff
36 #error invalid MAX_PKT_SIZE
37 #endif
38
39 #if RX_BUF_SIZE > 0x7ff || RX_BUF_SIZE > PAGE_SIZE
40 #error invalid RX_BUF_SIZE
41 #endif
42
43 /******************************************************************************
44 * private data
45 *****************************************************************************/
46 struct ftmac100_descs {
47 struct ftmac100_rxdes rxdes[RX_QUEUE_ENTRIES];
48 struct ftmac100_txdes txdes[TX_QUEUE_ENTRIES];
49 };
50
51 struct ftmac100 {
52 struct resource *res;
53 void __iomem *base;
54 int irq;
55
56 struct ftmac100_descs *descs;
57 dma_addr_t descs_dma_addr;
58
59 unsigned int rx_pointer;
60 unsigned int tx_clean_pointer;
61 unsigned int tx_pointer;
62 unsigned int tx_pending;
63
64 spinlock_t tx_lock;
65
66 struct net_device *netdev;
67 struct device *dev;
68 struct napi_struct napi;
69
70 struct mii_if_info mii;
71 };
72
73 static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
74 struct ftmac100_rxdes *rxdes, gfp_t gfp);
75
76 /******************************************************************************
77 * internal functions (hardware register access)
78 *****************************************************************************/
79 #define INT_MASK_ALL_ENABLED (FTMAC100_INT_RPKT_FINISH | \
80 FTMAC100_INT_NORXBUF | \
81 FTMAC100_INT_XPKT_OK | \
82 FTMAC100_INT_XPKT_LOST | \
83 FTMAC100_INT_RPKT_LOST | \
84 FTMAC100_INT_AHB_ERR | \
85 FTMAC100_INT_PHYSTS_CHG)
86
87 #define INT_MASK_ALL_DISABLED 0
88
89 static void ftmac100_enable_all_int(struct ftmac100 *priv)
90 {
91 iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTMAC100_OFFSET_IMR);
92 }
93
94 static void ftmac100_disable_all_int(struct ftmac100 *priv)
95 {
96 iowrite32(INT_MASK_ALL_DISABLED, priv->base + FTMAC100_OFFSET_IMR);
97 }
98
99 static void ftmac100_set_rx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
100 {
101 iowrite32(addr, priv->base + FTMAC100_OFFSET_RXR_BADR);
102 }
103
104 static void ftmac100_set_tx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
105 {
106 iowrite32(addr, priv->base + FTMAC100_OFFSET_TXR_BADR);
107 }
108
109 static void ftmac100_txdma_start_polling(struct ftmac100 *priv)
110 {
111 iowrite32(1, priv->base + FTMAC100_OFFSET_TXPD);
112 }
113
114 static int ftmac100_reset(struct ftmac100 *priv)
115 {
116 struct net_device *netdev = priv->netdev;
117 int i;
118
119 /* NOTE: reset clears all registers */
120 iowrite32(FTMAC100_MACCR_SW_RST, priv->base + FTMAC100_OFFSET_MACCR);
121
122 for (i = 0; i < 5; i++) {
123 unsigned int maccr;
124
125 maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR);
126 if (!(maccr & FTMAC100_MACCR_SW_RST)) {
127 /*
128 * FTMAC100_MACCR_SW_RST cleared does not indicate
129 * that hardware reset completed (what the f*ck).
130 * We still need to wait for a while.
131 */
132 udelay(500);
133 return 0;
134 }
135
136 udelay(1000);
137 }
138
139 netdev_err(netdev, "software reset failed\n");
140 return -EIO;
141 }
142
143 static void ftmac100_set_mac(struct ftmac100 *priv, const unsigned char *mac)
144 {
145 unsigned int maddr = mac[0] << 8 | mac[1];
146 unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
147
148 iowrite32(maddr, priv->base + FTMAC100_OFFSET_MAC_MADR);
149 iowrite32(laddr, priv->base + FTMAC100_OFFSET_MAC_LADR);
150 }
151
152 static void ftmac100_setup_mc_ht(struct ftmac100 *priv)
153 {
154 struct netdev_hw_addr *ha;
155 u64 maht = 0; /* Multicast Address Hash Table */
156
157 netdev_for_each_mc_addr(ha, priv->netdev) {
158 u32 hash = ether_crc(ETH_ALEN, ha->addr) >> 26;
159
160 maht |= BIT_ULL(hash);
161 }
162
163 iowrite32(lower_32_bits(maht), priv->base + FTMAC100_OFFSET_MAHT0);
164 iowrite32(upper_32_bits(maht), priv->base + FTMAC100_OFFSET_MAHT1);
165 }
166
167 static void ftmac100_set_rx_bits(struct ftmac100 *priv, unsigned int *maccr)
168 {
169 struct net_device *netdev = priv->netdev;
170
171 /* Clear all */
172 *maccr &= ~(FTMAC100_MACCR_RCV_ALL | FTMAC100_MACCR_RX_MULTIPKT |
173 FTMAC100_MACCR_HT_MULTI_EN);
174
175 /* Set the requested bits */
176 if (netdev->flags & IFF_PROMISC)
177 *maccr |= FTMAC100_MACCR_RCV_ALL;
178 if (netdev->flags & IFF_ALLMULTI)
179 *maccr |= FTMAC100_MACCR_RX_MULTIPKT;
180 else if (netdev_mc_count(netdev)) {
181 *maccr |= FTMAC100_MACCR_HT_MULTI_EN;
182 ftmac100_setup_mc_ht(priv);
183 }
184 }
185
186 #define MACCR_ENABLE_ALL (FTMAC100_MACCR_XMT_EN | \
187 FTMAC100_MACCR_RCV_EN | \
188 FTMAC100_MACCR_XDMA_EN | \
189 FTMAC100_MACCR_RDMA_EN | \
190 FTMAC100_MACCR_CRC_APD | \
191 FTMAC100_MACCR_FULLDUP | \
192 FTMAC100_MACCR_RX_RUNT | \
193 FTMAC100_MACCR_RX_BROADPKT)
194
195 static int ftmac100_start_hw(struct ftmac100 *priv)
196 {
197 struct net_device *netdev = priv->netdev;
198 unsigned int maccr = MACCR_ENABLE_ALL;
199
200 if (ftmac100_reset(priv))
201 return -EIO;
202
203 /* setup ring buffer base registers */
204 ftmac100_set_rx_ring_base(priv,
205 priv->descs_dma_addr +
206 offsetof(struct ftmac100_descs, rxdes));
207 ftmac100_set_tx_ring_base(priv,
208 priv->descs_dma_addr +
209 offsetof(struct ftmac100_descs, txdes));
210
211 iowrite32(FTMAC100_APTC_RXPOLL_CNT(1), priv->base + FTMAC100_OFFSET_APTC);
212
213 ftmac100_set_mac(priv, netdev->dev_addr);
214
215 /* See ftmac100_change_mtu() */
216 if (netdev->mtu > ETH_DATA_LEN)
217 maccr |= FTMAC100_MACCR_RX_FTL;
218
219 ftmac100_set_rx_bits(priv, &maccr);
220
221 iowrite32(maccr, priv->base + FTMAC100_OFFSET_MACCR);
222 return 0;
223 }
224
225 static void ftmac100_stop_hw(struct ftmac100 *priv)
226 {
227 iowrite32(0, priv->base + FTMAC100_OFFSET_MACCR);
228 }
229
230 /******************************************************************************
231 * internal functions (receive descriptor)
232 *****************************************************************************/
233 static bool ftmac100_rxdes_first_segment(struct ftmac100_rxdes *rxdes)
234 {
235 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FRS);
236 }
237
238 static bool ftmac100_rxdes_last_segment(struct ftmac100_rxdes *rxdes)
239 {
240 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_LRS);
241 }
242
243 static bool ftmac100_rxdes_owned_by_dma(struct ftmac100_rxdes *rxdes)
244 {
245 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
246 }
247
248 static void ftmac100_rxdes_set_dma_own(struct ftmac100_rxdes *rxdes)
249 {
250 /* clear status bits */
251 rxdes->rxdes0 = cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
252 }
253
254 static bool ftmac100_rxdes_rx_error(struct ftmac100_rxdes *rxdes)
255 {
256 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ERR);
257 }
258
259 static bool ftmac100_rxdes_crc_error(struct ftmac100_rxdes *rxdes)
260 {
261 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_CRC_ERR);
262 }
263
264 static bool ftmac100_rxdes_runt(struct ftmac100_rxdes *rxdes)
265 {
266 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RUNT);
267 }
268
269 static bool ftmac100_rxdes_odd_nibble(struct ftmac100_rxdes *rxdes)
270 {
271 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ODD_NB);
272 }
273
274 static unsigned int ftmac100_rxdes_frame_length(struct ftmac100_rxdes *rxdes)
275 {
276 return le32_to_cpu(rxdes->rxdes0) & FTMAC100_RXDES0_RFL;
277 }
278
279 static bool ftmac100_rxdes_multicast(struct ftmac100_rxdes *rxdes)
280 {
281 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_MULTICAST);
282 }
283
284 static void ftmac100_rxdes_set_buffer_size(struct ftmac100_rxdes *rxdes,
285 unsigned int size)
286 {
287 rxdes->rxdes1 &= cpu_to_le32(FTMAC100_RXDES1_EDORR);
288 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_RXBUF_SIZE(size));
289 }
290
291 static void ftmac100_rxdes_set_end_of_ring(struct ftmac100_rxdes *rxdes)
292 {
293 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_EDORR);
294 }
295
296 static void ftmac100_rxdes_set_dma_addr(struct ftmac100_rxdes *rxdes,
297 dma_addr_t addr)
298 {
299 rxdes->rxdes2 = cpu_to_le32(addr);
300 }
301
302 static dma_addr_t ftmac100_rxdes_get_dma_addr(struct ftmac100_rxdes *rxdes)
303 {
304 return le32_to_cpu(rxdes->rxdes2);
305 }
306
307 /*
308 * rxdes3 is not used by hardware. We use it to keep track of page.
309 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
310 */
311 static void ftmac100_rxdes_set_page(struct ftmac100_rxdes *rxdes, struct page *page)
312 {
313 rxdes->rxdes3 = (unsigned int)page;
314 }
315
316 static struct page *ftmac100_rxdes_get_page(struct ftmac100_rxdes *rxdes)
317 {
318 return (struct page *)rxdes->rxdes3;
319 }
320
321 /******************************************************************************
322 * internal functions (receive)
323 *****************************************************************************/
324 static int ftmac100_next_rx_pointer(int pointer)
325 {
326 return (pointer + 1) & (RX_QUEUE_ENTRIES - 1);
327 }
328
329 static void ftmac100_rx_pointer_advance(struct ftmac100 *priv)
330 {
331 priv->rx_pointer = ftmac100_next_rx_pointer(priv->rx_pointer);
332 }
333
334 static struct ftmac100_rxdes *ftmac100_current_rxdes(struct ftmac100 *priv)
335 {
336 return &priv->descs->rxdes[priv->rx_pointer];
337 }
338
339 static struct ftmac100_rxdes *
340 ftmac100_rx_locate_first_segment(struct ftmac100 *priv)
341 {
342 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
343
344 while (!ftmac100_rxdes_owned_by_dma(rxdes)) {
345 if (ftmac100_rxdes_first_segment(rxdes))
346 return rxdes;
347
348 ftmac100_rxdes_set_dma_own(rxdes);
349 ftmac100_rx_pointer_advance(priv);
350 rxdes = ftmac100_current_rxdes(priv);
351 }
352
353 return NULL;
354 }
355
356 static bool ftmac100_rx_packet_error(struct ftmac100 *priv,
357 struct ftmac100_rxdes *rxdes)
358 {
359 struct net_device *netdev = priv->netdev;
360 bool error = false;
361
362 if (unlikely(ftmac100_rxdes_rx_error(rxdes))) {
363 if (net_ratelimit())
364 netdev_info(netdev, "rx err\n");
365
366 netdev->stats.rx_errors++;
367 error = true;
368 }
369
370 if (unlikely(ftmac100_rxdes_crc_error(rxdes))) {
371 if (net_ratelimit())
372 netdev_info(netdev, "rx crc err\n");
373
374 netdev->stats.rx_crc_errors++;
375 error = true;
376 }
377
378 if (unlikely(ftmac100_rxdes_runt(rxdes))) {
379 if (net_ratelimit())
380 netdev_info(netdev, "rx runt\n");
381
382 netdev->stats.rx_length_errors++;
383 error = true;
384 } else if (unlikely(ftmac100_rxdes_odd_nibble(rxdes))) {
385 if (net_ratelimit())
386 netdev_info(netdev, "rx odd nibble\n");
387
388 netdev->stats.rx_length_errors++;
389 error = true;
390 }
391 /*
392 * FTMAC100_RXDES0_FTL is not an error, it just indicates that the
393 * frame is longer than 1518 octets. Receiving these is possible when
394 * we told the hardware not to drop them, via FTMAC100_MACCR_RX_FTL.
395 */
396
397 return error;
398 }
399
400 static void ftmac100_rx_drop_packet(struct ftmac100 *priv)
401 {
402 struct net_device *netdev = priv->netdev;
403 struct ftmac100_rxdes *rxdes = ftmac100_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 (ftmac100_rxdes_last_segment(rxdes))
411 done = true;
412
413 ftmac100_rxdes_set_dma_own(rxdes);
414 ftmac100_rx_pointer_advance(priv);
415 rxdes = ftmac100_current_rxdes(priv);
416 } while (!done && !ftmac100_rxdes_owned_by_dma(rxdes));
417
418 netdev->stats.rx_dropped++;
419 }
420
421 static bool ftmac100_rx_packet(struct ftmac100 *priv, int *processed)
422 {
423 struct net_device *netdev = priv->netdev;
424 struct ftmac100_rxdes *rxdes;
425 struct sk_buff *skb;
426 struct page *page;
427 dma_addr_t map;
428 int length;
429 bool ret;
430
431 rxdes = ftmac100_rx_locate_first_segment(priv);
432 if (!rxdes)
433 return false;
434
435 if (unlikely(ftmac100_rx_packet_error(priv, rxdes))) {
436 ftmac100_rx_drop_packet(priv);
437 return true;
438 }
439
440 /* We don't support multi-segment packets for now, so drop them. */
441 ret = ftmac100_rxdes_last_segment(rxdes);
442 if (unlikely(!ret)) {
443 netdev->stats.rx_length_errors++;
444 ftmac100_rx_drop_packet(priv);
445 return true;
446 }
447
448 /* start processing */
449 skb = netdev_alloc_skb_ip_align(netdev, 128);
450 if (unlikely(!skb)) {
451 if (net_ratelimit())
452 netdev_err(netdev, "rx skb alloc failed\n");
453
454 ftmac100_rx_drop_packet(priv);
455 return true;
456 }
457
458 if (unlikely(ftmac100_rxdes_multicast(rxdes)))
459 netdev->stats.multicast++;
460
461 map = ftmac100_rxdes_get_dma_addr(rxdes);
462 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
463
464 length = ftmac100_rxdes_frame_length(rxdes);
465 page = ftmac100_rxdes_get_page(rxdes);
466 skb_fill_page_desc(skb, 0, page, 0, length);
467 skb->len += length;
468 skb->data_len += length;
469
470 if (length > 128) {
471 skb->truesize += PAGE_SIZE;
472 /* We pull the minimum amount into linear part */
473 __pskb_pull_tail(skb, ETH_HLEN);
474 } else {
475 /* Small frames are copied into linear part to free one page */
476 __pskb_pull_tail(skb, length);
477 }
478 ftmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC);
479
480 ftmac100_rx_pointer_advance(priv);
481
482 skb->protocol = eth_type_trans(skb, netdev);
483
484 netdev->stats.rx_packets++;
485 netdev->stats.rx_bytes += skb->len;
486
487 /* push packet to protocol stack */
488 netif_receive_skb(skb);
489
490 (*processed)++;
491 return true;
492 }
493
494 /******************************************************************************
495 * internal functions (transmit descriptor)
496 *****************************************************************************/
497 static void ftmac100_txdes_reset(struct ftmac100_txdes *txdes)
498 {
499 /* clear all except end of ring bit */
500 txdes->txdes0 = 0;
501 txdes->txdes1 &= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
502 txdes->txdes2 = 0;
503 txdes->txdes3 = 0;
504 }
505
506 static bool ftmac100_txdes_owned_by_dma(struct ftmac100_txdes *txdes)
507 {
508 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
509 }
510
511 static void ftmac100_txdes_set_dma_own(struct ftmac100_txdes *txdes)
512 {
513 /*
514 * Make sure dma own bit will not be set before any other
515 * descriptor fields.
516 */
517 wmb();
518 txdes->txdes0 |= cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
519 }
520
521 static bool ftmac100_txdes_excessive_collision(struct ftmac100_txdes *txdes)
522 {
523 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_EXSCOL);
524 }
525
526 static bool ftmac100_txdes_late_collision(struct ftmac100_txdes *txdes)
527 {
528 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_LATECOL);
529 }
530
531 static void ftmac100_txdes_set_end_of_ring(struct ftmac100_txdes *txdes)
532 {
533 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
534 }
535
536 static void ftmac100_txdes_set_first_segment(struct ftmac100_txdes *txdes)
537 {
538 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_FTS);
539 }
540
541 static void ftmac100_txdes_set_last_segment(struct ftmac100_txdes *txdes)
542 {
543 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_LTS);
544 }
545
546 static void ftmac100_txdes_set_txint(struct ftmac100_txdes *txdes)
547 {
548 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXIC);
549 }
550
551 static void ftmac100_txdes_set_buffer_size(struct ftmac100_txdes *txdes,
552 unsigned int len)
553 {
554 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXBUF_SIZE(len));
555 }
556
557 static void ftmac100_txdes_set_dma_addr(struct ftmac100_txdes *txdes,
558 dma_addr_t addr)
559 {
560 txdes->txdes2 = cpu_to_le32(addr);
561 }
562
563 static dma_addr_t ftmac100_txdes_get_dma_addr(struct ftmac100_txdes *txdes)
564 {
565 return le32_to_cpu(txdes->txdes2);
566 }
567
568 /*
569 * txdes3 is not used by hardware. We use it to keep track of socket buffer.
570 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
571 */
572 static void ftmac100_txdes_set_skb(struct ftmac100_txdes *txdes, struct sk_buff *skb)
573 {
574 txdes->txdes3 = (unsigned int)skb;
575 }
576
577 static struct sk_buff *ftmac100_txdes_get_skb(struct ftmac100_txdes *txdes)
578 {
579 return (struct sk_buff *)txdes->txdes3;
580 }
581
582 /******************************************************************************
583 * internal functions (transmit)
584 *****************************************************************************/
585 static int ftmac100_next_tx_pointer(int pointer)
586 {
587 return (pointer + 1) & (TX_QUEUE_ENTRIES - 1);
588 }
589
590 static void ftmac100_tx_pointer_advance(struct ftmac100 *priv)
591 {
592 priv->tx_pointer = ftmac100_next_tx_pointer(priv->tx_pointer);
593 }
594
595 static void ftmac100_tx_clean_pointer_advance(struct ftmac100 *priv)
596 {
597 priv->tx_clean_pointer = ftmac100_next_tx_pointer(priv->tx_clean_pointer);
598 }
599
600 static struct ftmac100_txdes *ftmac100_current_txdes(struct ftmac100 *priv)
601 {
602 return &priv->descs->txdes[priv->tx_pointer];
603 }
604
605 static struct ftmac100_txdes *ftmac100_current_clean_txdes(struct ftmac100 *priv)
606 {
607 return &priv->descs->txdes[priv->tx_clean_pointer];
608 }
609
610 static bool ftmac100_tx_complete_packet(struct ftmac100 *priv)
611 {
612 struct net_device *netdev = priv->netdev;
613 struct ftmac100_txdes *txdes;
614 struct sk_buff *skb;
615 dma_addr_t map;
616
617 if (priv->tx_pending == 0)
618 return false;
619
620 txdes = ftmac100_current_clean_txdes(priv);
621
622 if (ftmac100_txdes_owned_by_dma(txdes))
623 return false;
624
625 skb = ftmac100_txdes_get_skb(txdes);
626 map = ftmac100_txdes_get_dma_addr(txdes);
627
628 if (unlikely(ftmac100_txdes_excessive_collision(txdes) ||
629 ftmac100_txdes_late_collision(txdes))) {
630 /*
631 * packet transmitted to ethernet lost due to late collision
632 * or excessive collision
633 */
634 netdev->stats.tx_aborted_errors++;
635 } else {
636 netdev->stats.tx_packets++;
637 netdev->stats.tx_bytes += skb->len;
638 }
639
640 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
641 dev_kfree_skb(skb);
642
643 ftmac100_txdes_reset(txdes);
644
645 ftmac100_tx_clean_pointer_advance(priv);
646
647 spin_lock(&priv->tx_lock);
648 priv->tx_pending--;
649 spin_unlock(&priv->tx_lock);
650 netif_wake_queue(netdev);
651
652 return true;
653 }
654
655 static void ftmac100_tx_complete(struct ftmac100 *priv)
656 {
657 while (ftmac100_tx_complete_packet(priv))
658 ;
659 }
660
661 static netdev_tx_t ftmac100_xmit(struct ftmac100 *priv, struct sk_buff *skb,
662 dma_addr_t map)
663 {
664 struct net_device *netdev = priv->netdev;
665 struct ftmac100_txdes *txdes;
666 unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
667
668 txdes = ftmac100_current_txdes(priv);
669 ftmac100_tx_pointer_advance(priv);
670
671 /* setup TX descriptor */
672 ftmac100_txdes_set_skb(txdes, skb);
673 ftmac100_txdes_set_dma_addr(txdes, map);
674
675 ftmac100_txdes_set_first_segment(txdes);
676 ftmac100_txdes_set_last_segment(txdes);
677 ftmac100_txdes_set_txint(txdes);
678 ftmac100_txdes_set_buffer_size(txdes, len);
679
680 spin_lock(&priv->tx_lock);
681 priv->tx_pending++;
682 if (priv->tx_pending == TX_QUEUE_ENTRIES)
683 netif_stop_queue(netdev);
684
685 /* start transmit */
686 ftmac100_txdes_set_dma_own(txdes);
687 spin_unlock(&priv->tx_lock);
688
689 ftmac100_txdma_start_polling(priv);
690 return NETDEV_TX_OK;
691 }
692
693 /******************************************************************************
694 * internal functions (buffer)
695 *****************************************************************************/
696 static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
697 struct ftmac100_rxdes *rxdes, gfp_t gfp)
698 {
699 struct net_device *netdev = priv->netdev;
700 struct page *page;
701 dma_addr_t map;
702
703 page = alloc_page(gfp);
704 if (!page) {
705 if (net_ratelimit())
706 netdev_err(netdev, "failed to allocate rx page\n");
707 return -ENOMEM;
708 }
709
710 map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE);
711 if (unlikely(dma_mapping_error(priv->dev, map))) {
712 if (net_ratelimit())
713 netdev_err(netdev, "failed to map rx page\n");
714 __free_page(page);
715 return -ENOMEM;
716 }
717
718 ftmac100_rxdes_set_page(rxdes, page);
719 ftmac100_rxdes_set_dma_addr(rxdes, map);
720 ftmac100_rxdes_set_buffer_size(rxdes, RX_BUF_SIZE);
721 ftmac100_rxdes_set_dma_own(rxdes);
722 return 0;
723 }
724
725 static void ftmac100_free_buffers(struct ftmac100 *priv)
726 {
727 int i;
728
729 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
730 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
731 struct page *page = ftmac100_rxdes_get_page(rxdes);
732 dma_addr_t map = ftmac100_rxdes_get_dma_addr(rxdes);
733
734 if (!page)
735 continue;
736
737 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
738 __free_page(page);
739 }
740
741 for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
742 struct ftmac100_txdes *txdes = &priv->descs->txdes[i];
743 struct sk_buff *skb = ftmac100_txdes_get_skb(txdes);
744 dma_addr_t map = ftmac100_txdes_get_dma_addr(txdes);
745
746 if (!skb)
747 continue;
748
749 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
750 dev_kfree_skb(skb);
751 }
752
753 dma_free_coherent(priv->dev, sizeof(struct ftmac100_descs),
754 priv->descs, priv->descs_dma_addr);
755 }
756
757 static int ftmac100_alloc_buffers(struct ftmac100 *priv)
758 {
759 int i;
760
761 priv->descs = dma_alloc_coherent(priv->dev,
762 sizeof(struct ftmac100_descs),
763 &priv->descs_dma_addr, GFP_KERNEL);
764 if (!priv->descs)
765 return -ENOMEM;
766
767 /* initialize RX ring */
768 ftmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
769
770 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
771 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
772
773 if (ftmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL))
774 goto err;
775 }
776
777 /* initialize TX ring */
778 ftmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
779 return 0;
780
781 err:
782 ftmac100_free_buffers(priv);
783 return -ENOMEM;
784 }
785
786 /******************************************************************************
787 * struct mii_if_info functions
788 *****************************************************************************/
789 static int ftmac100_mdio_read(struct net_device *netdev, int phy_id, int reg)
790 {
791 struct ftmac100 *priv = netdev_priv(netdev);
792 unsigned int phycr;
793 int i;
794
795 phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
796 FTMAC100_PHYCR_REGAD(reg) |
797 FTMAC100_PHYCR_MIIRD;
798
799 iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
800
801 for (i = 0; i < 10; i++) {
802 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
803
804 if ((phycr & FTMAC100_PHYCR_MIIRD) == 0)
805 return phycr & FTMAC100_PHYCR_MIIRDATA;
806
807 udelay(100);
808 }
809
810 netdev_err(netdev, "mdio read timed out\n");
811 return 0;
812 }
813
814 static void ftmac100_mdio_write(struct net_device *netdev, int phy_id, int reg,
815 int data)
816 {
817 struct ftmac100 *priv = netdev_priv(netdev);
818 unsigned int phycr;
819 int i;
820
821 phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
822 FTMAC100_PHYCR_REGAD(reg) |
823 FTMAC100_PHYCR_MIIWR;
824
825 data = FTMAC100_PHYWDATA_MIIWDATA(data);
826
827 iowrite32(data, priv->base + FTMAC100_OFFSET_PHYWDATA);
828 iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
829
830 for (i = 0; i < 10; i++) {
831 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
832
833 if ((phycr & FTMAC100_PHYCR_MIIWR) == 0)
834 return;
835
836 udelay(100);
837 }
838
839 netdev_err(netdev, "mdio write timed out\n");
840 }
841
842 /******************************************************************************
843 * struct ethtool_ops functions
844 *****************************************************************************/
845 static void ftmac100_get_drvinfo(struct net_device *netdev,
846 struct ethtool_drvinfo *info)
847 {
848 strscpy(info->driver, DRV_NAME, sizeof(info->driver));
849 strscpy(info->bus_info, dev_name(&netdev->dev), sizeof(info->bus_info));
850 }
851
852 static int ftmac100_get_link_ksettings(struct net_device *netdev,
853 struct ethtool_link_ksettings *cmd)
854 {
855 struct ftmac100 *priv = netdev_priv(netdev);
856
857 mii_ethtool_get_link_ksettings(&priv->mii, cmd);
858
859 return 0;
860 }
861
862 static int ftmac100_set_link_ksettings(struct net_device *netdev,
863 const struct ethtool_link_ksettings *cmd)
864 {
865 struct ftmac100 *priv = netdev_priv(netdev);
866 return mii_ethtool_set_link_ksettings(&priv->mii, cmd);
867 }
868
869 static int ftmac100_nway_reset(struct net_device *netdev)
870 {
871 struct ftmac100 *priv = netdev_priv(netdev);
872 return mii_nway_restart(&priv->mii);
873 }
874
875 static u32 ftmac100_get_link(struct net_device *netdev)
876 {
877 struct ftmac100 *priv = netdev_priv(netdev);
878 return mii_link_ok(&priv->mii);
879 }
880
881 static const struct ethtool_ops ftmac100_ethtool_ops = {
882 .get_drvinfo = ftmac100_get_drvinfo,
883 .nway_reset = ftmac100_nway_reset,
884 .get_link = ftmac100_get_link,
885 .get_link_ksettings = ftmac100_get_link_ksettings,
886 .set_link_ksettings = ftmac100_set_link_ksettings,
887 };
888
889 /******************************************************************************
890 * interrupt handler
891 *****************************************************************************/
892 static irqreturn_t ftmac100_interrupt(int irq, void *dev_id)
893 {
894 struct net_device *netdev = dev_id;
895 struct ftmac100 *priv = netdev_priv(netdev);
896
897 /* Disable interrupts for polling */
898 ftmac100_disable_all_int(priv);
899 if (likely(netif_running(netdev)))
900 napi_schedule(&priv->napi);
901
902 return IRQ_HANDLED;
903 }
904
905 /******************************************************************************
906 * struct napi_struct functions
907 *****************************************************************************/
908 static int ftmac100_poll(struct napi_struct *napi, int budget)
909 {
910 struct ftmac100 *priv = container_of(napi, struct ftmac100, napi);
911 struct net_device *netdev = priv->netdev;
912 unsigned int status;
913 bool completed = true;
914 int rx = 0;
915
916 status = ioread32(priv->base + FTMAC100_OFFSET_ISR);
917
918 if (status & (FTMAC100_INT_RPKT_FINISH | FTMAC100_INT_NORXBUF)) {
919 /*
920 * FTMAC100_INT_RPKT_FINISH:
921 * RX DMA has received packets into RX buffer successfully
922 *
923 * FTMAC100_INT_NORXBUF:
924 * RX buffer unavailable
925 */
926 bool retry;
927
928 do {
929 retry = ftmac100_rx_packet(priv, &rx);
930 } while (retry && rx < budget);
931
932 if (retry && rx == budget)
933 completed = false;
934 }
935
936 if (status & (FTMAC100_INT_XPKT_OK | FTMAC100_INT_XPKT_LOST)) {
937 /*
938 * FTMAC100_INT_XPKT_OK:
939 * packet transmitted to ethernet successfully
940 *
941 * FTMAC100_INT_XPKT_LOST:
942 * packet transmitted to ethernet lost due to late
943 * collision or excessive collision
944 */
945 ftmac100_tx_complete(priv);
946 }
947
948 if (status & (FTMAC100_INT_NORXBUF | FTMAC100_INT_RPKT_LOST |
949 FTMAC100_INT_AHB_ERR | FTMAC100_INT_PHYSTS_CHG)) {
950 if (net_ratelimit())
951 netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
952 status & FTMAC100_INT_NORXBUF ? "NORXBUF " : "",
953 status & FTMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "",
954 status & FTMAC100_INT_AHB_ERR ? "AHB_ERR " : "",
955 status & FTMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : "");
956
957 if (status & FTMAC100_INT_NORXBUF) {
958 /* RX buffer unavailable */
959 netdev->stats.rx_over_errors++;
960 }
961
962 if (status & FTMAC100_INT_RPKT_LOST) {
963 /* received packet lost due to RX FIFO full */
964 netdev->stats.rx_fifo_errors++;
965 }
966
967 if (status & FTMAC100_INT_PHYSTS_CHG) {
968 /* PHY link status change */
969 mii_check_link(&priv->mii);
970 }
971 }
972
973 if (completed) {
974 /* stop polling */
975 napi_complete(napi);
976 ftmac100_enable_all_int(priv);
977 }
978
979 return rx;
980 }
981
982 /******************************************************************************
983 * struct net_device_ops functions
984 *****************************************************************************/
985 static int ftmac100_open(struct net_device *netdev)
986 {
987 struct ftmac100 *priv = netdev_priv(netdev);
988 int err;
989
990 err = ftmac100_alloc_buffers(priv);
991 if (err) {
992 netdev_err(netdev, "failed to allocate buffers\n");
993 goto err_alloc;
994 }
995
996 err = request_irq(priv->irq, ftmac100_interrupt, 0, netdev->name, netdev);
997 if (err) {
998 netdev_err(netdev, "failed to request irq %d\n", priv->irq);
999 goto err_irq;
1000 }
1001
1002 priv->rx_pointer = 0;
1003 priv->tx_clean_pointer = 0;
1004 priv->tx_pointer = 0;
1005 priv->tx_pending = 0;
1006
1007 err = ftmac100_start_hw(priv);
1008 if (err)
1009 goto err_hw;
1010
1011 napi_enable(&priv->napi);
1012 netif_start_queue(netdev);
1013
1014 ftmac100_enable_all_int(priv);
1015
1016 return 0;
1017
1018 err_hw:
1019 free_irq(priv->irq, netdev);
1020 err_irq:
1021 ftmac100_free_buffers(priv);
1022 err_alloc:
1023 return err;
1024 }
1025
1026 static int ftmac100_stop(struct net_device *netdev)
1027 {
1028 struct ftmac100 *priv = netdev_priv(netdev);
1029
1030 ftmac100_disable_all_int(priv);
1031 netif_stop_queue(netdev);
1032 napi_disable(&priv->napi);
1033 ftmac100_stop_hw(priv);
1034 free_irq(priv->irq, netdev);
1035 ftmac100_free_buffers(priv);
1036
1037 return 0;
1038 }
1039
1040 static netdev_tx_t
1041 ftmac100_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
1042 {
1043 struct ftmac100 *priv = netdev_priv(netdev);
1044 dma_addr_t map;
1045
1046 if (unlikely(skb->len > MAX_PKT_SIZE)) {
1047 if (net_ratelimit())
1048 netdev_dbg(netdev, "tx packet too big\n");
1049
1050 netdev->stats.tx_dropped++;
1051 dev_kfree_skb(skb);
1052 return NETDEV_TX_OK;
1053 }
1054
1055 map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
1056 if (unlikely(dma_mapping_error(priv->dev, map))) {
1057 /* drop packet */
1058 if (net_ratelimit())
1059 netdev_err(netdev, "map socket buffer failed\n");
1060
1061 netdev->stats.tx_dropped++;
1062 dev_kfree_skb(skb);
1063 return NETDEV_TX_OK;
1064 }
1065
1066 return ftmac100_xmit(priv, skb, map);
1067 }
1068
1069 /* optional */
1070 static int ftmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1071 {
1072 struct ftmac100 *priv = netdev_priv(netdev);
1073 struct mii_ioctl_data *data = if_mii(ifr);
1074
1075 return generic_mii_ioctl(&priv->mii, data, cmd, NULL);
1076 }
1077
1078 static int ftmac100_change_mtu(struct net_device *netdev, int mtu)
1079 {
1080 struct ftmac100 *priv = netdev_priv(netdev);
1081 unsigned int maccr;
1082
1083 maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR);
1084 if (mtu > ETH_DATA_LEN) {
1085 /* process long packets in the driver */
1086 maccr |= FTMAC100_MACCR_RX_FTL;
1087 } else {
1088 /* Let the controller drop incoming packets greater
1089 * than 1518 (that is 1500 + 14 Ethernet + 4 FCS).
1090 */
1091 maccr &= ~FTMAC100_MACCR_RX_FTL;
1092 }
1093 iowrite32(maccr, priv->base + FTMAC100_OFFSET_MACCR);
1094
1095 WRITE_ONCE(netdev->mtu, mtu);
1096
1097 return 0;
1098 }
1099
1100 static void ftmac100_set_rx_mode(struct net_device *netdev)
1101 {
1102 struct ftmac100 *priv = netdev_priv(netdev);
1103 unsigned int maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR);
1104
1105 ftmac100_set_rx_bits(priv, &maccr);
1106 iowrite32(maccr, priv->base + FTMAC100_OFFSET_MACCR);
1107 }
1108
1109 static const struct net_device_ops ftmac100_netdev_ops = {
1110 .ndo_open = ftmac100_open,
1111 .ndo_stop = ftmac100_stop,
1112 .ndo_start_xmit = ftmac100_hard_start_xmit,
1113 .ndo_set_mac_address = eth_mac_addr,
1114 .ndo_validate_addr = eth_validate_addr,
1115 .ndo_eth_ioctl = ftmac100_do_ioctl,
1116 .ndo_change_mtu = ftmac100_change_mtu,
1117 .ndo_set_rx_mode = ftmac100_set_rx_mode,
1118 };
1119
1120 /******************************************************************************
1121 * struct platform_driver functions
1122 *****************************************************************************/
1123 static int ftmac100_probe(struct platform_device *pdev)
1124 {
1125 struct resource *res;
1126 int irq;
1127 struct net_device *netdev;
1128 struct ftmac100 *priv;
1129 int err;
1130
1131 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1132 if (!res)
1133 return -ENXIO;
1134
1135 irq = platform_get_irq(pdev, 0);
1136 if (irq < 0)
1137 return irq;
1138
1139 /* setup net_device */
1140 netdev = alloc_etherdev(sizeof(*priv));
1141 if (!netdev) {
1142 err = -ENOMEM;
1143 goto err_alloc_etherdev;
1144 }
1145
1146 SET_NETDEV_DEV(netdev, &pdev->dev);
1147 netdev->ethtool_ops = &ftmac100_ethtool_ops;
1148 netdev->netdev_ops = &ftmac100_netdev_ops;
1149 netdev->max_mtu = MAX_PKT_SIZE - VLAN_ETH_HLEN;
1150
1151 err = platform_get_ethdev_address(&pdev->dev, netdev);
1152 if (err == -EPROBE_DEFER)
1153 goto defer_get_mac;
1154
1155 platform_set_drvdata(pdev, netdev);
1156
1157 /* setup private data */
1158 priv = netdev_priv(netdev);
1159 priv->netdev = netdev;
1160 priv->dev = &pdev->dev;
1161
1162 spin_lock_init(&priv->tx_lock);
1163
1164 /* initialize NAPI */
1165 netif_napi_add(netdev, &priv->napi, ftmac100_poll);
1166
1167 /* map io memory */
1168 priv->res = request_mem_region(res->start, resource_size(res),
1169 dev_name(&pdev->dev));
1170 if (!priv->res) {
1171 dev_err(&pdev->dev, "Could not reserve memory region\n");
1172 err = -ENOMEM;
1173 goto err_req_mem;
1174 }
1175
1176 priv->base = ioremap(res->start, resource_size(res));
1177 if (!priv->base) {
1178 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
1179 err = -EIO;
1180 goto err_ioremap;
1181 }
1182
1183 priv->irq = irq;
1184
1185 /* initialize struct mii_if_info */
1186 priv->mii.phy_id = 0;
1187 priv->mii.phy_id_mask = 0x1f;
1188 priv->mii.reg_num_mask = 0x1f;
1189 priv->mii.dev = netdev;
1190 priv->mii.mdio_read = ftmac100_mdio_read;
1191 priv->mii.mdio_write = ftmac100_mdio_write;
1192
1193 /* register network device */
1194 err = register_netdev(netdev);
1195 if (err) {
1196 dev_err(&pdev->dev, "Failed to register netdev\n");
1197 goto err_register_netdev;
1198 }
1199
1200 netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base);
1201
1202 if (!is_valid_ether_addr(netdev->dev_addr)) {
1203 eth_hw_addr_random(netdev);
1204 netdev_info(netdev, "generated random MAC address %pM\n",
1205 netdev->dev_addr);
1206 }
1207
1208 return 0;
1209
1210 err_register_netdev:
1211 iounmap(priv->base);
1212 err_ioremap:
1213 release_resource(priv->res);
1214 err_req_mem:
1215 netif_napi_del(&priv->napi);
1216 defer_get_mac:
1217 free_netdev(netdev);
1218 err_alloc_etherdev:
1219 return err;
1220 }
1221
1222 static void ftmac100_remove(struct platform_device *pdev)
1223 {
1224 struct net_device *netdev;
1225 struct ftmac100 *priv;
1226
1227 netdev = platform_get_drvdata(pdev);
1228 priv = netdev_priv(netdev);
1229
1230 unregister_netdev(netdev);
1231
1232 iounmap(priv->base);
1233 release_resource(priv->res);
1234
1235 netif_napi_del(&priv->napi);
1236 free_netdev(netdev);
1237 }
1238
1239 static const struct of_device_id ftmac100_of_ids[] = {
1240 { .compatible = "andestech,atmac100" },
1241 { }
1242 };
1243
1244 static struct platform_driver ftmac100_driver = {
1245 .probe = ftmac100_probe,
1246 .remove = ftmac100_remove,
1247 .driver = {
1248 .name = DRV_NAME,
1249 .of_match_table = ftmac100_of_ids
1250 },
1251 };
1252
1253 /******************************************************************************
1254 * initialization / finalization
1255 *****************************************************************************/
1256 module_platform_driver(ftmac100_driver);
1257
1258 MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");
1259 MODULE_DESCRIPTION("FTMAC100 driver");
1260 MODULE_LICENSE("GPL");
1261 MODULE_DEVICE_TABLE(of, ftmac100_of_ids);
Linux Kernel