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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2010 ASIX Electronics Corporation
4 * Copyright (c) 2020 Samsung Electronics Co., Ltd.
5 *
6 * ASIX AX88796C SPI Fast Ethernet Linux driver
7 */
8
9#define pr_fmt(fmt) "ax88796c: " fmt
10
11#include "ax88796c_main.h"
12#include "ax88796c_ioctl.h"
13
14#include <linux/bitmap.h>
15#include <linux/etherdevice.h>
16#include <linux/iopoll.h>
17#include <linux/lockdep.h>
18#include <linux/mdio.h>
19#include <linux/minmax.h>
20#include <linux/module.h>
21#include <linux/netdevice.h>
22#include <linux/of.h>
23#include <linux/phy.h>
24#include <linux/skbuff.h>
25#include <linux/spi/spi.h>
26
27static int comp = IS_ENABLED(CONFIG_SPI_AX88796C_COMPRESSION);
28static int msg_enable = NETIF_MSG_PROBE |
29 NETIF_MSG_LINK |
30 NETIF_MSG_RX_ERR |
31 NETIF_MSG_TX_ERR;
32
33static const char *no_regs_list = "80018001,e1918001,8001a001,fc0d0000";
34unsigned long ax88796c_no_regs_mask[AX88796C_REGDUMP_LEN / (sizeof(unsigned long) * 8)];
35
36module_param(msg_enable, int, 0444);
37MODULE_PARM_DESC(msg_enable, "Message mask (see linux/netdevice.h for bitmap)");
38
39static int ax88796c_soft_reset(struct ax88796c_device *ax_local)
40{
41 u16 temp;
42 int ret;
43
44 lockdep_assert_held(&ax_local->spi_lock);
45
46 AX_WRITE(&ax_local->ax_spi, PSR_RESET, P0_PSR);
47 AX_WRITE(&ax_local->ax_spi, PSR_RESET_CLR, P0_PSR);
48
49 ret = read_poll_timeout(AX_READ, ret,
50 (ret & PSR_DEV_READY),
51 0, jiffies_to_usecs(160 * HZ / 1000), false,
52 &ax_local->ax_spi, P0_PSR);
53 if (ret)
54 return ret;
55
56 temp = AX_READ(&ax_local->ax_spi, P4_SPICR);
57 if (ax_local->priv_flags & AX_CAP_COMP) {
58 AX_WRITE(&ax_local->ax_spi,
59 (temp | SPICR_RCEN | SPICR_QCEN), P4_SPICR);
60 ax_local->ax_spi.comp = 1;
61 } else {
62 AX_WRITE(&ax_local->ax_spi,
63 (temp & ~(SPICR_RCEN | SPICR_QCEN)), P4_SPICR);
64 ax_local->ax_spi.comp = 0;
65 }
66
67 return 0;
68}
69
70static int ax88796c_reload_eeprom(struct ax88796c_device *ax_local)
71{
72 int ret;
73
74 lockdep_assert_held(&ax_local->spi_lock);
75
76 AX_WRITE(&ax_local->ax_spi, EECR_RELOAD, P3_EECR);
77
78 ret = read_poll_timeout(AX_READ, ret,
79 (ret & PSR_DEV_READY),
80 0, jiffies_to_usecs(2 * HZ / 1000), false,
81 &ax_local->ax_spi, P0_PSR);
82 if (ret) {
83 dev_err(&ax_local->spi->dev,
84 "timeout waiting for reload eeprom\n");
85 return ret;
86 }
87
88 return 0;
89}
90
91static void ax88796c_set_hw_multicast(struct net_device *ndev)
92{
93 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
94 int mc_count = netdev_mc_count(ndev);
95 u16 rx_ctl = RXCR_AB;
96
97 lockdep_assert_held(&ax_local->spi_lock);
98
99 memset(ax_local->multi_filter, 0, AX_MCAST_FILTER_SIZE);
100
101 if (ndev->flags & IFF_PROMISC) {
102 rx_ctl |= RXCR_PRO;
103
104 } else if (ndev->flags & IFF_ALLMULTI || mc_count > AX_MAX_MCAST) {
105 rx_ctl |= RXCR_AMALL;
106
107 } else if (mc_count == 0) {
108 /* just broadcast and directed */
109 } else {
110 u32 crc_bits;
111 int i;
112 struct netdev_hw_addr *ha;
113
114 netdev_for_each_mc_addr(ha, ndev) {
115 crc_bits = ether_crc(ETH_ALEN, ha->addr);
116 ax_local->multi_filter[crc_bits >> 29] |=
117 (1 << ((crc_bits >> 26) & 7));
118 }
119
120 for (i = 0; i < 4; i++) {
121 AX_WRITE(&ax_local->ax_spi,
122 ((ax_local->multi_filter[i * 2 + 1] << 8) |
123 ax_local->multi_filter[i * 2]), P3_MFAR(i));
124 }
125 }
126
127 AX_WRITE(&ax_local->ax_spi, rx_ctl, P2_RXCR);
128}
129
130static void ax88796c_set_mac_addr(struct net_device *ndev)
131{
132 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
133
134 lockdep_assert_held(&ax_local->spi_lock);
135
136 AX_WRITE(&ax_local->ax_spi, ((u16)(ndev->dev_addr[4] << 8) |
137 (u16)ndev->dev_addr[5]), P3_MACASR0);
138 AX_WRITE(&ax_local->ax_spi, ((u16)(ndev->dev_addr[2] << 8) |
139 (u16)ndev->dev_addr[3]), P3_MACASR1);
140 AX_WRITE(&ax_local->ax_spi, ((u16)(ndev->dev_addr[0] << 8) |
141 (u16)ndev->dev_addr[1]), P3_MACASR2);
142}
143
144static void ax88796c_load_mac_addr(struct net_device *ndev)
145{
146 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
147 u8 addr[ETH_ALEN];
148 u16 temp;
149
150 lockdep_assert_held(&ax_local->spi_lock);
151
152 /* Try the device tree first */
153 if (!platform_get_ethdev_address(&ax_local->spi->dev, ndev) &&
154 is_valid_ether_addr(ndev->dev_addr)) {
155 if (netif_msg_probe(ax_local))
156 dev_info(&ax_local->spi->dev,
157 "MAC address read from device tree\n");
158 return;
159 }
160
161 /* Read the MAC address from AX88796C */
162 temp = AX_READ(&ax_local->ax_spi, P3_MACASR0);
163 addr[5] = (u8)temp;
164 addr[4] = (u8)(temp >> 8);
165
166 temp = AX_READ(&ax_local->ax_spi, P3_MACASR1);
167 addr[3] = (u8)temp;
168 addr[2] = (u8)(temp >> 8);
169
170 temp = AX_READ(&ax_local->ax_spi, P3_MACASR2);
171 addr[1] = (u8)temp;
172 addr[0] = (u8)(temp >> 8);
173
174 if (is_valid_ether_addr(addr)) {
175 eth_hw_addr_set(ndev, addr);
176 if (netif_msg_probe(ax_local))
177 dev_info(&ax_local->spi->dev,
178 "MAC address read from ASIX chip\n");
179 return;
180 }
181
182 /* Use random address if none found */
183 if (netif_msg_probe(ax_local))
184 dev_info(&ax_local->spi->dev, "Use random MAC address\n");
185 eth_hw_addr_random(ndev);
186}
187
188static void ax88796c_proc_tx_hdr(struct tx_pkt_info *info, u8 ip_summed)
189{
190 u16 pkt_len_bar = (~info->pkt_len & TX_HDR_SOP_PKTLENBAR);
191
192 /* Prepare SOP header */
193 info->sop.flags_len = info->pkt_len |
194 ((ip_summed == CHECKSUM_NONE) ||
195 (ip_summed == CHECKSUM_UNNECESSARY) ? TX_HDR_SOP_DICF : 0);
196
197 info->sop.seq_lenbar = ((info->seq_num << 11) & TX_HDR_SOP_SEQNUM)
198 | pkt_len_bar;
199 cpu_to_be16s(&info->sop.flags_len);
200 cpu_to_be16s(&info->sop.seq_lenbar);
201
202 /* Prepare Segment header */
203 info->seg.flags_seqnum_seglen = TX_HDR_SEG_FS | TX_HDR_SEG_LS
204 | info->pkt_len;
205
206 info->seg.eo_so_seglenbar = pkt_len_bar;
207
208 cpu_to_be16s(&info->seg.flags_seqnum_seglen);
209 cpu_to_be16s(&info->seg.eo_so_seglenbar);
210
211 /* Prepare EOP header */
212 info->eop.seq_len = ((info->seq_num << 11) &
213 TX_HDR_EOP_SEQNUM) | info->pkt_len;
214 info->eop.seqbar_lenbar = ((~info->seq_num << 11) &
215 TX_HDR_EOP_SEQNUMBAR) | pkt_len_bar;
216
217 cpu_to_be16s(&info->eop.seq_len);
218 cpu_to_be16s(&info->eop.seqbar_lenbar);
219}
220
221static int
222ax88796c_check_free_pages(struct ax88796c_device *ax_local, u8 need_pages)
223{
224 u8 free_pages;
225 u16 tmp;
226
227 lockdep_assert_held(&ax_local->spi_lock);
228
229 free_pages = AX_READ(&ax_local->ax_spi, P0_TFBFCR) & TX_FREEBUF_MASK;
230 if (free_pages < need_pages) {
231 /* schedule free page interrupt */
232 tmp = AX_READ(&ax_local->ax_spi, P0_TFBFCR)
233 & TFBFCR_SCHE_FREE_PAGE;
234 AX_WRITE(&ax_local->ax_spi, tmp | TFBFCR_TX_PAGE_SET |
235 TFBFCR_SET_FREE_PAGE(need_pages),
236 P0_TFBFCR);
237 return -ENOMEM;
238 }
239
240 return 0;
241}
242
243static struct sk_buff *
244ax88796c_tx_fixup(struct net_device *ndev, struct sk_buff_head *q)
245{
246 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
247 u8 spi_len = ax_local->ax_spi.comp ? 1 : 4;
248 struct sk_buff *skb;
249 struct tx_pkt_info info;
250 struct skb_data *entry;
251 u16 pkt_len;
252 u8 padlen, seq_num;
253 u8 need_pages;
254 int headroom;
255 int tailroom;
256
257 if (skb_queue_empty(q))
258 return NULL;
259
260 skb = skb_peek(q);
261 pkt_len = skb->len;
262 need_pages = (pkt_len + TX_OVERHEAD + 127) >> 7;
263 if (ax88796c_check_free_pages(ax_local, need_pages) != 0)
264 return NULL;
265
266 headroom = skb_headroom(skb);
267 tailroom = skb_tailroom(skb);
268 padlen = round_up(pkt_len, 4) - pkt_len;
269 seq_num = ++ax_local->seq_num & 0x1F;
270
271 info.pkt_len = pkt_len;
272
273 if (skb_cloned(skb) ||
274 (headroom < (TX_OVERHEAD + spi_len)) ||
275 (tailroom < (padlen + TX_EOP_SIZE))) {
276 size_t h = max((TX_OVERHEAD + spi_len) - headroom, 0);
277 size_t t = max((padlen + TX_EOP_SIZE) - tailroom, 0);
278
279 if (pskb_expand_head(skb, h, t, GFP_KERNEL))
280 return NULL;
281 }
282
283 info.seq_num = seq_num;
284 ax88796c_proc_tx_hdr(&info, skb->ip_summed);
285
286 /* SOP and SEG header */
287 memcpy(skb_push(skb, TX_OVERHEAD), &info.tx_overhead, TX_OVERHEAD);
288
289 /* Write SPI TXQ header */
290 memcpy(skb_push(skb, spi_len), ax88796c_tx_cmd_buf, spi_len);
291
292 /* Make 32-bit alignment */
293 skb_put(skb, padlen);
294
295 /* EOP header */
296 skb_put_data(skb, &info.eop, TX_EOP_SIZE);
297
298 skb_unlink(skb, q);
299
300 entry = (struct skb_data *)skb->cb;
301 memset(entry, 0, sizeof(*entry));
302 entry->len = pkt_len;
303
304 if (netif_msg_pktdata(ax_local)) {
305 char pfx[IFNAMSIZ + 7];
306
307 snprintf(pfx, sizeof(pfx), "%s: ", ndev->name);
308
309 netdev_info(ndev, "TX packet len %d, total len %d, seq %d\n",
310 pkt_len, skb->len, seq_num);
311
312 netdev_info(ndev, " SPI Header:\n");
313 print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
314 skb->data, 4, 0);
315
316 netdev_info(ndev, " TX SOP:\n");
317 print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
318 skb->data + 4, TX_OVERHEAD, 0);
319
320 netdev_info(ndev, " TX packet:\n");
321 print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
322 skb->data + 4 + TX_OVERHEAD,
323 skb->len - TX_EOP_SIZE - 4 - TX_OVERHEAD, 0);
324
325 netdev_info(ndev, " TX EOP:\n");
326 print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
327 skb->data + skb->len - 4, 4, 0);
328 }
329
330 return skb;
331}
332
333static int ax88796c_hard_xmit(struct ax88796c_device *ax_local)
334{
335 struct ax88796c_pcpu_stats *stats;
336 struct sk_buff *tx_skb;
337 struct skb_data *entry;
338 unsigned long flags;
339
340 lockdep_assert_held(&ax_local->spi_lock);
341
342 stats = this_cpu_ptr(ax_local->stats);
343 tx_skb = ax88796c_tx_fixup(ax_local->ndev, &ax_local->tx_wait_q);
344
345 if (!tx_skb) {
346 this_cpu_inc(ax_local->stats->tx_dropped);
347 return 0;
348 }
349 entry = (struct skb_data *)tx_skb->cb;
350
351 AX_WRITE(&ax_local->ax_spi,
352 (TSNR_TXB_START | TSNR_PKT_CNT(1)), P0_TSNR);
353
354 axspi_write_txq(&ax_local->ax_spi, tx_skb->data, tx_skb->len);
355
356 if (((AX_READ(&ax_local->ax_spi, P0_TSNR) & TXNR_TXB_IDLE) == 0) ||
357 ((ISR_TXERR & AX_READ(&ax_local->ax_spi, P0_ISR)) != 0)) {
358 /* Ack tx error int */
359 AX_WRITE(&ax_local->ax_spi, ISR_TXERR, P0_ISR);
360
361 this_cpu_inc(ax_local->stats->tx_dropped);
362
363 if (net_ratelimit())
364 netif_err(ax_local, tx_err, ax_local->ndev,
365 "TX FIFO error, re-initialize the TX bridge\n");
366
367 /* Reinitial tx bridge */
368 AX_WRITE(&ax_local->ax_spi, TXNR_TXB_REINIT |
369 AX_READ(&ax_local->ax_spi, P0_TSNR), P0_TSNR);
370 ax_local->seq_num = 0;
371 } else {
372 flags = u64_stats_update_begin_irqsave(&stats->syncp);
373 u64_stats_inc(&stats->tx_packets);
374 u64_stats_add(&stats->tx_bytes, entry->len);
375 u64_stats_update_end_irqrestore(&stats->syncp, flags);
376 }
377
378 entry->state = tx_done;
379 dev_kfree_skb(tx_skb);
380
381 return 1;
382}
383
384static netdev_tx_t
385ax88796c_start_xmit(struct sk_buff *skb, struct net_device *ndev)
386{
387 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
388
389 skb_queue_tail(&ax_local->tx_wait_q, skb);
390 if (skb_queue_len(&ax_local->tx_wait_q) > TX_QUEUE_HIGH_WATER)
391 netif_stop_queue(ndev);
392
393 set_bit(EVENT_TX, &ax_local->flags);
394 schedule_work(&ax_local->ax_work);
395
396 return NETDEV_TX_OK;
397}
398
399static void
400ax88796c_skb_return(struct ax88796c_device *ax_local,
401 struct sk_buff *skb, struct rx_header *rxhdr)
402{
403 struct net_device *ndev = ax_local->ndev;
404 struct ax88796c_pcpu_stats *stats;
405 unsigned long flags;
406 int status;
407
408 stats = this_cpu_ptr(ax_local->stats);
409
410 do {
411 if (!(ndev->features & NETIF_F_RXCSUM))
412 break;
413
414 /* checksum error bit is set */
415 if ((rxhdr->flags & RX_HDR3_L3_ERR) ||
416 (rxhdr->flags & RX_HDR3_L4_ERR))
417 break;
418
419 /* Other types may be indicated by more than one bit. */
420 if ((rxhdr->flags & RX_HDR3_L4_TYPE_TCP) ||
421 (rxhdr->flags & RX_HDR3_L4_TYPE_UDP))
422 skb->ip_summed = CHECKSUM_UNNECESSARY;
423 } while (0);
424
425 flags = u64_stats_update_begin_irqsave(&stats->syncp);
426 u64_stats_inc(&stats->rx_packets);
427 u64_stats_add(&stats->rx_bytes, skb->len);
428 u64_stats_update_end_irqrestore(&stats->syncp, flags);
429
430 skb->dev = ndev;
431 skb->protocol = eth_type_trans(skb, ax_local->ndev);
432
433 netif_info(ax_local, rx_status, ndev, "< rx, len %zu, type 0x%x\n",
434 skb->len + sizeof(struct ethhdr), skb->protocol);
435
436 status = netif_rx(skb);
437 if (status != NET_RX_SUCCESS && net_ratelimit())
438 netif_info(ax_local, rx_err, ndev,
439 "netif_rx status %d\n", status);
440}
441
442static void
443ax88796c_rx_fixup(struct ax88796c_device *ax_local, struct sk_buff *rx_skb)
444{
445 struct rx_header *rxhdr = (struct rx_header *)rx_skb->data;
446 struct net_device *ndev = ax_local->ndev;
447 u16 len;
448
449 be16_to_cpus(&rxhdr->flags_len);
450 be16_to_cpus(&rxhdr->seq_lenbar);
451 be16_to_cpus(&rxhdr->flags);
452
453 if ((rxhdr->flags_len & RX_HDR1_PKT_LEN) !=
454 (~rxhdr->seq_lenbar & 0x7FF)) {
455 netif_err(ax_local, rx_err, ndev, "Header error\n");
456
457 this_cpu_inc(ax_local->stats->rx_frame_errors);
458 kfree_skb(rx_skb);
459 return;
460 }
461
462 if ((rxhdr->flags_len & RX_HDR1_MII_ERR) ||
463 (rxhdr->flags_len & RX_HDR1_CRC_ERR)) {
464 netif_err(ax_local, rx_err, ndev, "CRC or MII error\n");
465
466 this_cpu_inc(ax_local->stats->rx_crc_errors);
467 kfree_skb(rx_skb);
468 return;
469 }
470
471 len = rxhdr->flags_len & RX_HDR1_PKT_LEN;
472 if (netif_msg_pktdata(ax_local)) {
473 char pfx[IFNAMSIZ + 7];
474
475 snprintf(pfx, sizeof(pfx), "%s: ", ndev->name);
476 netdev_info(ndev, "RX data, total len %d, packet len %d\n",
477 rx_skb->len, len);
478
479 netdev_info(ndev, " Dump RX packet header:");
480 print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
481 rx_skb->data, sizeof(*rxhdr), 0);
482
483 netdev_info(ndev, " Dump RX packet:");
484 print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
485 rx_skb->data + sizeof(*rxhdr), len, 0);
486 }
487
488 skb_pull(rx_skb, sizeof(*rxhdr));
489 pskb_trim(rx_skb, len);
490
491 ax88796c_skb_return(ax_local, rx_skb, rxhdr);
492}
493
494static int ax88796c_receive(struct net_device *ndev)
495{
496 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
497 struct skb_data *entry;
498 u16 w_count, pkt_len;
499 struct sk_buff *skb;
500 u8 pkt_cnt;
501
502 lockdep_assert_held(&ax_local->spi_lock);
503
504 /* check rx packet and total word count */
505 AX_WRITE(&ax_local->ax_spi, AX_READ(&ax_local->ax_spi, P0_RTWCR)
506 | RTWCR_RX_LATCH, P0_RTWCR);
507
508 pkt_cnt = AX_READ(&ax_local->ax_spi, P0_RXBCR2) & RXBCR2_PKT_MASK;
509 if (!pkt_cnt)
510 return 0;
511
512 pkt_len = AX_READ(&ax_local->ax_spi, P0_RCPHR) & 0x7FF;
513
514 w_count = round_up(pkt_len + 6, 4) >> 1;
515
516 skb = netdev_alloc_skb(ndev, w_count * 2);
517 if (!skb) {
518 AX_WRITE(&ax_local->ax_spi, RXBCR1_RXB_DISCARD, P0_RXBCR1);
519 this_cpu_inc(ax_local->stats->rx_dropped);
520 return 0;
521 }
522 entry = (struct skb_data *)skb->cb;
523
524 AX_WRITE(&ax_local->ax_spi, RXBCR1_RXB_START | w_count, P0_RXBCR1);
525
526 axspi_read_rxq(&ax_local->ax_spi,
527 skb_put(skb, w_count * 2), skb->len);
528
529 /* Check if rx bridge is idle */
530 if ((AX_READ(&ax_local->ax_spi, P0_RXBCR2) & RXBCR2_RXB_IDLE) == 0) {
531 if (net_ratelimit())
532 netif_err(ax_local, rx_err, ndev,
533 "Rx Bridge is not idle\n");
534 AX_WRITE(&ax_local->ax_spi, RXBCR2_RXB_REINIT, P0_RXBCR2);
535
536 entry->state = rx_err;
537 } else {
538 entry->state = rx_done;
539 }
540
541 AX_WRITE(&ax_local->ax_spi, ISR_RXPKT, P0_ISR);
542
543 ax88796c_rx_fixup(ax_local, skb);
544
545 return 1;
546}
547
548static int ax88796c_process_isr(struct ax88796c_device *ax_local)
549{
550 struct net_device *ndev = ax_local->ndev;
551 int todo = 0;
552 u16 isr;
553
554 lockdep_assert_held(&ax_local->spi_lock);
555
556 isr = AX_READ(&ax_local->ax_spi, P0_ISR);
557 AX_WRITE(&ax_local->ax_spi, isr, P0_ISR);
558
559 netif_dbg(ax_local, intr, ndev, " ISR 0x%04x\n", isr);
560
561 if (isr & ISR_TXERR) {
562 netif_dbg(ax_local, intr, ndev, " TXERR interrupt\n");
563 AX_WRITE(&ax_local->ax_spi, TXNR_TXB_REINIT, P0_TSNR);
564 ax_local->seq_num = 0x1f;
565 }
566
567 if (isr & ISR_TXPAGES) {
568 netif_dbg(ax_local, intr, ndev, " TXPAGES interrupt\n");
569 set_bit(EVENT_TX, &ax_local->flags);
570 }
571
572 if (isr & ISR_LINK) {
573 netif_dbg(ax_local, intr, ndev, " Link change interrupt\n");
574 phy_mac_interrupt(ax_local->ndev->phydev);
575 }
576
577 if (isr & ISR_RXPKT) {
578 netif_dbg(ax_local, intr, ndev, " RX interrupt\n");
579 todo = ax88796c_receive(ax_local->ndev);
580 }
581
582 return todo;
583}
584
585static irqreturn_t ax88796c_interrupt(int irq, void *dev_instance)
586{
587 struct ax88796c_device *ax_local;
588 struct net_device *ndev;
589
590 ndev = dev_instance;
591 if (!ndev) {
592 pr_err("irq %d for unknown device.\n", irq);
593 return IRQ_RETVAL(0);
594 }
595 ax_local = to_ax88796c_device(ndev);
596
597 disable_irq_nosync(irq);
598
599 netif_dbg(ax_local, intr, ndev, "Interrupt occurred\n");
600
601 set_bit(EVENT_INTR, &ax_local->flags);
602 schedule_work(&ax_local->ax_work);
603
604 return IRQ_HANDLED;
605}
606
607static void ax88796c_work(struct work_struct *work)
608{
609 struct ax88796c_device *ax_local =
610 container_of(work, struct ax88796c_device, ax_work);
611
612 mutex_lock(&ax_local->spi_lock);
613
614 if (test_bit(EVENT_SET_MULTI, &ax_local->flags)) {
615 ax88796c_set_hw_multicast(ax_local->ndev);
616 clear_bit(EVENT_SET_MULTI, &ax_local->flags);
617 }
618
619 if (test_bit(EVENT_INTR, &ax_local->flags)) {
620 AX_WRITE(&ax_local->ax_spi, IMR_MASKALL, P0_IMR);
621
622 while (ax88796c_process_isr(ax_local))
623 /* nothing */;
624
625 clear_bit(EVENT_INTR, &ax_local->flags);
626
627 AX_WRITE(&ax_local->ax_spi, IMR_DEFAULT, P0_IMR);
628
629 enable_irq(ax_local->ndev->irq);
630 }
631
632 if (test_bit(EVENT_TX, &ax_local->flags)) {
633 while (skb_queue_len(&ax_local->tx_wait_q)) {
634 if (!ax88796c_hard_xmit(ax_local))
635 break;
636 }
637
638 clear_bit(EVENT_TX, &ax_local->flags);
639
640 if (netif_queue_stopped(ax_local->ndev) &&
641 (skb_queue_len(&ax_local->tx_wait_q) < TX_QUEUE_LOW_WATER))
642 netif_wake_queue(ax_local->ndev);
643 }
644
645 mutex_unlock(&ax_local->spi_lock);
646}
647
648static void ax88796c_get_stats64(struct net_device *ndev,
649 struct rtnl_link_stats64 *stats)
650{
651 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
652 u32 rx_frame_errors = 0, rx_crc_errors = 0;
653 u32 rx_dropped = 0, tx_dropped = 0;
654 unsigned int start;
655 int cpu;
656
657 for_each_possible_cpu(cpu) {
658 struct ax88796c_pcpu_stats *s;
659 u64 rx_packets, rx_bytes;
660 u64 tx_packets, tx_bytes;
661
662 s = per_cpu_ptr(ax_local->stats, cpu);
663
664 do {
665 start = u64_stats_fetch_begin(&s->syncp);
666 rx_packets = u64_stats_read(&s->rx_packets);
667 rx_bytes = u64_stats_read(&s->rx_bytes);
668 tx_packets = u64_stats_read(&s->tx_packets);
669 tx_bytes = u64_stats_read(&s->tx_bytes);
670 } while (u64_stats_fetch_retry(&s->syncp, start));
671
672 stats->rx_packets += rx_packets;
673 stats->rx_bytes += rx_bytes;
674 stats->tx_packets += tx_packets;
675 stats->tx_bytes += tx_bytes;
676
677 rx_dropped += s->rx_dropped;
678 tx_dropped += s->tx_dropped;
679 rx_frame_errors += s->rx_frame_errors;
680 rx_crc_errors += s->rx_crc_errors;
681 }
682
683 stats->rx_dropped = rx_dropped;
684 stats->tx_dropped = tx_dropped;
685 stats->rx_frame_errors = rx_frame_errors;
686 stats->rx_crc_errors = rx_crc_errors;
687}
688
689static void ax88796c_set_mac(struct ax88796c_device *ax_local)
690{
691 u16 maccr;
692
693 maccr = (ax_local->link) ? MACCR_RXEN : 0;
694
695 switch (ax_local->speed) {
696 case SPEED_100:
697 maccr |= MACCR_SPEED_100;
698 break;
699 case SPEED_10:
700 case SPEED_UNKNOWN:
701 break;
702 default:
703 return;
704 }
705
706 switch (ax_local->duplex) {
707 case DUPLEX_FULL:
708 maccr |= MACCR_SPEED_100;
709 break;
710 case DUPLEX_HALF:
711 case DUPLEX_UNKNOWN:
712 break;
713 default:
714 return;
715 }
716
717 if (ax_local->flowctrl & AX_FC_ANEG &&
718 ax_local->phydev->autoneg) {
719 maccr |= ax_local->pause ? MACCR_RXFC_ENABLE : 0;
720 maccr |= !ax_local->pause != !ax_local->asym_pause ?
721 MACCR_TXFC_ENABLE : 0;
722 } else {
723 maccr |= (ax_local->flowctrl & AX_FC_RX) ? MACCR_RXFC_ENABLE : 0;
724 maccr |= (ax_local->flowctrl & AX_FC_TX) ? MACCR_TXFC_ENABLE : 0;
725 }
726
727 mutex_lock(&ax_local->spi_lock);
728
729 maccr |= AX_READ(&ax_local->ax_spi, P0_MACCR) &
730 ~(MACCR_DUPLEX_FULL | MACCR_SPEED_100 |
731 MACCR_TXFC_ENABLE | MACCR_RXFC_ENABLE);
732 AX_WRITE(&ax_local->ax_spi, maccr, P0_MACCR);
733
734 mutex_unlock(&ax_local->spi_lock);
735}
736
737static void ax88796c_handle_link_change(struct net_device *ndev)
738{
739 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
740 struct phy_device *phydev = ndev->phydev;
741 bool update = false;
742
743 if (phydev->link && (ax_local->speed != phydev->speed ||
744 ax_local->duplex != phydev->duplex ||
745 ax_local->pause != phydev->pause ||
746 ax_local->asym_pause != phydev->asym_pause)) {
747 ax_local->speed = phydev->speed;
748 ax_local->duplex = phydev->duplex;
749 ax_local->pause = phydev->pause;
750 ax_local->asym_pause = phydev->asym_pause;
751 update = true;
752 }
753
754 if (phydev->link != ax_local->link) {
755 if (!phydev->link) {
756 ax_local->speed = SPEED_UNKNOWN;
757 ax_local->duplex = DUPLEX_UNKNOWN;
758 }
759
760 ax_local->link = phydev->link;
761 update = true;
762 }
763
764 if (update)
765 ax88796c_set_mac(ax_local);
766
767 if (net_ratelimit())
768 phy_print_status(ndev->phydev);
769}
770
771static void ax88796c_set_csums(struct ax88796c_device *ax_local)
772{
773 struct net_device *ndev = ax_local->ndev;
774
775 lockdep_assert_held(&ax_local->spi_lock);
776
777 if (ndev->features & NETIF_F_RXCSUM) {
778 AX_WRITE(&ax_local->ax_spi, COERCR0_DEFAULT, P4_COERCR0);
779 AX_WRITE(&ax_local->ax_spi, COERCR1_DEFAULT, P4_COERCR1);
780 } else {
781 AX_WRITE(&ax_local->ax_spi, 0, P4_COERCR0);
782 AX_WRITE(&ax_local->ax_spi, 0, P4_COERCR1);
783 }
784
785 if (ndev->features & NETIF_F_HW_CSUM) {
786 AX_WRITE(&ax_local->ax_spi, COETCR0_DEFAULT, P4_COETCR0);
787 AX_WRITE(&ax_local->ax_spi, COETCR1_TXPPPE, P4_COETCR1);
788 } else {
789 AX_WRITE(&ax_local->ax_spi, 0, P4_COETCR0);
790 AX_WRITE(&ax_local->ax_spi, 0, P4_COETCR1);
791 }
792}
793
794static int
795ax88796c_open(struct net_device *ndev)
796{
797 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
798 unsigned long irq_flag = 0;
799 int fc = AX_FC_NONE;
800 int ret;
801 u16 t;
802
803 ret = request_irq(ndev->irq, ax88796c_interrupt,
804 irq_flag, ndev->name, ndev);
805 if (ret) {
806 netdev_err(ndev, "unable to get IRQ %d (errno=%d).\n",
807 ndev->irq, ret);
808 return ret;
809 }
810
811 mutex_lock(&ax_local->spi_lock);
812
813 ret = ax88796c_soft_reset(ax_local);
814 if (ret < 0) {
815 free_irq(ndev->irq, ndev);
816 mutex_unlock(&ax_local->spi_lock);
817 return ret;
818 }
819 ax_local->seq_num = 0x1f;
820
821 ax88796c_set_mac_addr(ndev);
822 ax88796c_set_csums(ax_local);
823
824 /* Disable stuffing packet */
825 t = AX_READ(&ax_local->ax_spi, P1_RXBSPCR);
826 t &= ~RXBSPCR_STUF_ENABLE;
827 AX_WRITE(&ax_local->ax_spi, t, P1_RXBSPCR);
828
829 /* Enable RX packet process */
830 AX_WRITE(&ax_local->ax_spi, RPPER_RXEN, P1_RPPER);
831
832 t = AX_READ(&ax_local->ax_spi, P0_FER);
833 t |= FER_RXEN | FER_TXEN | FER_BSWAP | FER_IRQ_PULL;
834 AX_WRITE(&ax_local->ax_spi, t, P0_FER);
835
836 /* Setup LED mode */
837 AX_WRITE(&ax_local->ax_spi,
838 (LCR_LED0_EN | LCR_LED0_DUPLEX | LCR_LED1_EN |
839 LCR_LED1_100MODE), P2_LCR0);
840 AX_WRITE(&ax_local->ax_spi,
841 (AX_READ(&ax_local->ax_spi, P2_LCR1) & LCR_LED2_MASK) |
842 LCR_LED2_EN | LCR_LED2_LINK, P2_LCR1);
843
844 /* Disable PHY auto-polling */
845 AX_WRITE(&ax_local->ax_spi, PCR_PHYID(AX88796C_PHY_ID), P2_PCR);
846
847 /* Enable MAC interrupts */
848 AX_WRITE(&ax_local->ax_spi, IMR_DEFAULT, P0_IMR);
849
850 mutex_unlock(&ax_local->spi_lock);
851
852 /* Setup flow-control configuration */
853 phy_support_asym_pause(ax_local->phydev);
854
855 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
856 ax_local->phydev->advertising) ||
857 linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
858 ax_local->phydev->advertising))
859 fc |= AX_FC_ANEG;
860
861 fc |= linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
862 ax_local->phydev->advertising) ? AX_FC_RX : 0;
863 fc |= (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
864 ax_local->phydev->advertising) !=
865 linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
866 ax_local->phydev->advertising)) ? AX_FC_TX : 0;
867 ax_local->flowctrl = fc;
868
869 phy_start(ax_local->ndev->phydev);
870
871 netif_start_queue(ndev);
872
873 spi_message_init(&ax_local->ax_spi.rx_msg);
874
875 return 0;
876}
877
878static int
879ax88796c_close(struct net_device *ndev)
880{
881 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
882
883 phy_stop(ndev->phydev);
884
885 /* We lock the mutex early not only to protect the device
886 * against concurrent access, but also avoid waking up the
887 * queue in ax88796c_work(). phy_stop() needs to be called
888 * before because it locks the mutex to access SPI.
889 */
890 mutex_lock(&ax_local->spi_lock);
891
892 netif_stop_queue(ndev);
893
894 /* No more work can be scheduled now. Make any pending work,
895 * including one already waiting for the mutex to be unlocked,
896 * NOP.
897 */
898 netif_dbg(ax_local, ifdown, ndev, "clearing bits\n");
899 clear_bit(EVENT_SET_MULTI, &ax_local->flags);
900 clear_bit(EVENT_INTR, &ax_local->flags);
901 clear_bit(EVENT_TX, &ax_local->flags);
902
903 /* Disable MAC interrupts */
904 AX_WRITE(&ax_local->ax_spi, IMR_MASKALL, P0_IMR);
905 __skb_queue_purge(&ax_local->tx_wait_q);
906 ax88796c_soft_reset(ax_local);
907
908 mutex_unlock(&ax_local->spi_lock);
909
910 cancel_work_sync(&ax_local->ax_work);
911
912 free_irq(ndev->irq, ndev);
913
914 return 0;
915}
916
917static int
918ax88796c_set_features(struct net_device *ndev, netdev_features_t features)
919{
920 struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
921 netdev_features_t changed = features ^ ndev->features;
922
923 if (!(changed & (NETIF_F_RXCSUM | NETIF_F_HW_CSUM)))
924 return 0;
925
926 ndev->features = features;
927
928 if (changed & (NETIF_F_RXCSUM | NETIF_F_HW_CSUM))
929 ax88796c_set_csums(ax_local);
930
931 return 0;
932}
933
934static const struct net_device_ops ax88796c_netdev_ops = {
935 .ndo_open = ax88796c_open,
936 .ndo_stop = ax88796c_close,
937 .ndo_start_xmit = ax88796c_start_xmit,
938 .ndo_get_stats64 = ax88796c_get_stats64,
939 .ndo_eth_ioctl = ax88796c_ioctl,
940 .ndo_set_mac_address = eth_mac_addr,
941 .ndo_set_features = ax88796c_set_features,
942};
943
944static int ax88796c_hard_reset(struct ax88796c_device *ax_local)
945{
946 struct device *dev = (struct device *)&ax_local->spi->dev;
947 struct gpio_desc *reset_gpio;
948
949 /* reset info */
950 reset_gpio = gpiod_get(dev, "reset", 0);
951 if (IS_ERR(reset_gpio)) {
952 dev_err(dev, "Could not get 'reset' GPIO: %ld", PTR_ERR(reset_gpio));
953 return PTR_ERR(reset_gpio);
954 }
955
956 /* set reset */
957 gpiod_direction_output(reset_gpio, 1);
958 msleep(100);
959 gpiod_direction_output(reset_gpio, 0);
960 gpiod_put(reset_gpio);
961 msleep(20);
962
963 return 0;
964}
965
966static int ax88796c_probe(struct spi_device *spi)
967{
968 char phy_id[MII_BUS_ID_SIZE + 3];
969 struct ax88796c_device *ax_local;
970 struct net_device *ndev;
971 u16 temp;
972 int ret;
973
974 ndev = devm_alloc_etherdev(&spi->dev, sizeof(*ax_local));
975 if (!ndev)
976 return -ENOMEM;
977
978 SET_NETDEV_DEV(ndev, &spi->dev);
979
980 ax_local = to_ax88796c_device(ndev);
981
982 dev_set_drvdata(&spi->dev, ax_local);
983 ax_local->spi = spi;
984 ax_local->ax_spi.spi = spi;
985
986 ax_local->stats =
987 devm_netdev_alloc_pcpu_stats(&spi->dev,
988 struct ax88796c_pcpu_stats);
989 if (!ax_local->stats)
990 return -ENOMEM;
991
992 ax_local->ndev = ndev;
993 ax_local->priv_flags |= comp ? AX_CAP_COMP : 0;
994 ax_local->msg_enable = msg_enable;
995 mutex_init(&ax_local->spi_lock);
996
997 ax_local->mdiobus = devm_mdiobus_alloc(&spi->dev);
998 if (!ax_local->mdiobus)
999 return -ENOMEM;
1000
1001 ax_local->mdiobus->priv = ax_local;
1002 ax_local->mdiobus->read = ax88796c_mdio_read;
1003 ax_local->mdiobus->write = ax88796c_mdio_write;
1004 ax_local->mdiobus->name = "ax88976c-mdiobus";
1005 ax_local->mdiobus->phy_mask = (u32)~BIT(AX88796C_PHY_ID);
1006 ax_local->mdiobus->parent = &spi->dev;
1007
1008 snprintf(ax_local->mdiobus->id, MII_BUS_ID_SIZE,
1009 "ax88796c-%s.%u", dev_name(&spi->dev), spi_get_chipselect(spi, 0));
1010
1011 ret = devm_mdiobus_register(&spi->dev, ax_local->mdiobus);
1012 if (ret < 0) {
1013 dev_err(&spi->dev, "Could not register MDIO bus\n");
1014 return ret;
1015 }
1016
1017 if (netif_msg_probe(ax_local)) {
1018 dev_info(&spi->dev, "AX88796C-SPI Configuration:\n");
1019 dev_info(&spi->dev, " Compression : %s\n",
1020 ax_local->priv_flags & AX_CAP_COMP ? "ON" : "OFF");
1021 }
1022
1023 ndev->irq = spi->irq;
1024 ndev->netdev_ops = &ax88796c_netdev_ops;
1025 ndev->ethtool_ops = &ax88796c_ethtool_ops;
1026 ndev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1027 ndev->features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1028 ndev->needed_headroom = TX_OVERHEAD;
1029 ndev->needed_tailroom = TX_EOP_SIZE;
1030
1031 mutex_lock(&ax_local->spi_lock);
1032
1033 /* ax88796c gpio reset */
1034 ax88796c_hard_reset(ax_local);
1035
1036 /* Reset AX88796C */
1037 ret = ax88796c_soft_reset(ax_local);
1038 if (ret < 0) {
1039 ret = -ENODEV;
1040 mutex_unlock(&ax_local->spi_lock);
1041 goto err;
1042 }
1043 /* Check board revision */
1044 temp = AX_READ(&ax_local->ax_spi, P2_CRIR);
1045 if ((temp & 0xF) != 0x0) {
1046 dev_err(&spi->dev, "spi read failed: %d\n", temp);
1047 ret = -ENODEV;
1048 mutex_unlock(&ax_local->spi_lock);
1049 goto err;
1050 }
1051
1052 /*Reload EEPROM*/
1053 ax88796c_reload_eeprom(ax_local);
1054
1055 ax88796c_load_mac_addr(ndev);
1056
1057 if (netif_msg_probe(ax_local))
1058 dev_info(&spi->dev,
1059 "irq %d, MAC addr %02X:%02X:%02X:%02X:%02X:%02X\n",
1060 ndev->irq,
1061 ndev->dev_addr[0], ndev->dev_addr[1],
1062 ndev->dev_addr[2], ndev->dev_addr[3],
1063 ndev->dev_addr[4], ndev->dev_addr[5]);
1064
1065 /* Disable power saving */
1066 AX_WRITE(&ax_local->ax_spi, (AX_READ(&ax_local->ax_spi, P0_PSCR)
1067 & PSCR_PS_MASK) | PSCR_PS_D0, P0_PSCR);
1068
1069 mutex_unlock(&ax_local->spi_lock);
1070
1071 INIT_WORK(&ax_local->ax_work, ax88796c_work);
1072
1073 skb_queue_head_init(&ax_local->tx_wait_q);
1074
1075 snprintf(phy_id, MII_BUS_ID_SIZE + 3, PHY_ID_FMT,
1076 ax_local->mdiobus->id, AX88796C_PHY_ID);
1077 ax_local->phydev = phy_connect(ax_local->ndev, phy_id,
1078 ax88796c_handle_link_change,
1079 PHY_INTERFACE_MODE_MII);
1080 if (IS_ERR(ax_local->phydev)) {
1081 ret = PTR_ERR(ax_local->phydev);
1082 goto err;
1083 }
1084 ax_local->phydev->irq = PHY_POLL;
1085
1086 ret = devm_register_netdev(&spi->dev, ndev);
1087 if (ret) {
1088 dev_err(&spi->dev, "failed to register a network device\n");
1089 goto err_phy_dis;
1090 }
1091
1092 netif_info(ax_local, probe, ndev, "%s %s registered\n",
1093 dev_driver_string(&spi->dev),
1094 dev_name(&spi->dev));
1095 phy_attached_info(ax_local->phydev);
1096
1097 return 0;
1098
1099err_phy_dis:
1100 phy_disconnect(ax_local->phydev);
1101err:
1102 return ret;
1103}
1104
1105static void ax88796c_remove(struct spi_device *spi)
1106{
1107 struct ax88796c_device *ax_local = dev_get_drvdata(&spi->dev);
1108 struct net_device *ndev = ax_local->ndev;
1109
1110 phy_disconnect(ndev->phydev);
1111
1112 netif_info(ax_local, probe, ndev, "removing network device %s %s\n",
1113 dev_driver_string(&spi->dev),
1114 dev_name(&spi->dev));
1115}
1116
1117#ifdef CONFIG_OF
1118static const struct of_device_id ax88796c_dt_ids[] = {
1119 { .compatible = "asix,ax88796c" },
1120 {},
1121};
1122MODULE_DEVICE_TABLE(of, ax88796c_dt_ids);
1123#endif
1124
1125static const struct spi_device_id asix_id[] = {
1126 { "ax88796c", 0 },
1127 { }
1128};
1129MODULE_DEVICE_TABLE(spi, asix_id);
1130
1131static struct spi_driver ax88796c_spi_driver = {
1132 .driver = {
1133 .name = DRV_NAME,
1134 .of_match_table = of_match_ptr(ax88796c_dt_ids),
1135 },
1136 .probe = ax88796c_probe,
1137 .remove = ax88796c_remove,
1138 .id_table = asix_id,
1139};
1140
1141static __init int ax88796c_spi_init(void)
1142{
1143 int ret;
1144
1145 bitmap_zero(ax88796c_no_regs_mask, AX88796C_REGDUMP_LEN);
1146 ret = bitmap_parse(no_regs_list, 35,
1147 ax88796c_no_regs_mask, AX88796C_REGDUMP_LEN);
1148 if (ret) {
1149 bitmap_fill(ax88796c_no_regs_mask, AX88796C_REGDUMP_LEN);
1150 pr_err("Invalid bitmap description, masking all registers\n");
1151 }
1152
1153 return spi_register_driver(&ax88796c_spi_driver);
1154}
1155
1156static __exit void ax88796c_spi_exit(void)
1157{
1158 spi_unregister_driver(&ax88796c_spi_driver);
1159}
1160
1161module_init(ax88796c_spi_init);
1162module_exit(ax88796c_spi_exit);
1163
1164MODULE_AUTHOR("Łukasz Stelmach <l.stelmach@samsung.com>");
1165MODULE_DESCRIPTION("ASIX AX88796C SPI Ethernet driver");
1166MODULE_LICENSE("GPL");