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25#include <linux/errno.h>
26#include <linux/etherdevice.h>
27#include <linux/if_arp.h>
28#include <linux/if_ether.h>
29#include <linux/init.h>
30#include <linux/interrupt.h>
31#include <linux/jiffies.h>
32#include <linux/kernel.h>
33#include <linux/kthread.h>
34#include <linux/module.h>
35#include <linux/moduleparam.h>
36#include <linux/netdevice.h>
37#include <linux/of.h>
38#include <linux/of_device.h>
39#include <linux/of_net.h>
40#include <linux/sched.h>
41#include <linux/skbuff.h>
42#include <linux/spi/spi.h>
43#include <linux/types.h>
44
45#include "qca_7k.h"
46#include "qca_7k_common.h"
47#include "qca_debug.h"
48#include "qca_spi.h"
49
50#define MAX_DMA_BURST_LEN 5000
51
52
53#define QCASPI_CLK_SPEED_MIN 1000000
54#define QCASPI_CLK_SPEED_MAX 16000000
55#define QCASPI_CLK_SPEED 8000000
56static int qcaspi_clkspeed;
57module_param(qcaspi_clkspeed, int, 0);
58MODULE_PARM_DESC(qcaspi_clkspeed, "SPI bus clock speed (Hz). Use 1000000-16000000.");
59
60#define QCASPI_BURST_LEN_MIN 1
61#define QCASPI_BURST_LEN_MAX MAX_DMA_BURST_LEN
62static int qcaspi_burst_len = MAX_DMA_BURST_LEN;
63module_param(qcaspi_burst_len, int, 0);
64MODULE_PARM_DESC(qcaspi_burst_len, "Number of data bytes per burst. Use 1-5000.");
65
66#define QCASPI_PLUGGABLE_MIN 0
67#define QCASPI_PLUGGABLE_MAX 1
68static int qcaspi_pluggable = QCASPI_PLUGGABLE_MIN;
69module_param(qcaspi_pluggable, int, 0);
70MODULE_PARM_DESC(qcaspi_pluggable, "Pluggable SPI connection (yes/no).");
71
72#define QCASPI_TX_TIMEOUT (1 * HZ)
73#define QCASPI_QCA7K_REBOOT_TIME_MS 1000
74
75static void
76start_spi_intr_handling(struct qcaspi *qca, u16 *intr_cause)
77{
78 *intr_cause = 0;
79
80 qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, 0);
81 qcaspi_read_register(qca, SPI_REG_INTR_CAUSE, intr_cause);
82 netdev_dbg(qca->net_dev, "interrupts: 0x%04x\n", *intr_cause);
83}
84
85static void
86end_spi_intr_handling(struct qcaspi *qca, u16 intr_cause)
87{
88 u16 intr_enable = (SPI_INT_CPU_ON |
89 SPI_INT_PKT_AVLBL |
90 SPI_INT_RDBUF_ERR |
91 SPI_INT_WRBUF_ERR);
92
93 qcaspi_write_register(qca, SPI_REG_INTR_CAUSE, intr_cause);
94 qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, intr_enable);
95 netdev_dbg(qca->net_dev, "acking int: 0x%04x\n", intr_cause);
96}
97
98static u32
99qcaspi_write_burst(struct qcaspi *qca, u8 *src, u32 len)
100{
101 __be16 cmd;
102 struct spi_message msg;
103 struct spi_transfer transfer[2];
104 int ret;
105
106 memset(&transfer, 0, sizeof(transfer));
107 spi_message_init(&msg);
108
109 cmd = cpu_to_be16(QCA7K_SPI_WRITE | QCA7K_SPI_EXTERNAL);
110 transfer[0].tx_buf = &cmd;
111 transfer[0].len = QCASPI_CMD_LEN;
112 transfer[1].tx_buf = src;
113 transfer[1].len = len;
114
115 spi_message_add_tail(&transfer[0], &msg);
116 spi_message_add_tail(&transfer[1], &msg);
117 ret = spi_sync(qca->spi_dev, &msg);
118
119 if (ret || (msg.actual_length != QCASPI_CMD_LEN + len)) {
120 qcaspi_spi_error(qca);
121 return 0;
122 }
123
124 return len;
125}
126
127static u32
128qcaspi_write_legacy(struct qcaspi *qca, u8 *src, u32 len)
129{
130 struct spi_message msg;
131 struct spi_transfer transfer;
132 int ret;
133
134 memset(&transfer, 0, sizeof(transfer));
135 spi_message_init(&msg);
136
137 transfer.tx_buf = src;
138 transfer.len = len;
139
140 spi_message_add_tail(&transfer, &msg);
141 ret = spi_sync(qca->spi_dev, &msg);
142
143 if (ret || (msg.actual_length != len)) {
144 qcaspi_spi_error(qca);
145 return 0;
146 }
147
148 return len;
149}
150
151static u32
152qcaspi_read_burst(struct qcaspi *qca, u8 *dst, u32 len)
153{
154 struct spi_message msg;
155 __be16 cmd;
156 struct spi_transfer transfer[2];
157 int ret;
158
159 memset(&transfer, 0, sizeof(transfer));
160 spi_message_init(&msg);
161
162 cmd = cpu_to_be16(QCA7K_SPI_READ | QCA7K_SPI_EXTERNAL);
163 transfer[0].tx_buf = &cmd;
164 transfer[0].len = QCASPI_CMD_LEN;
165 transfer[1].rx_buf = dst;
166 transfer[1].len = len;
167
168 spi_message_add_tail(&transfer[0], &msg);
169 spi_message_add_tail(&transfer[1], &msg);
170 ret = spi_sync(qca->spi_dev, &msg);
171
172 if (ret || (msg.actual_length != QCASPI_CMD_LEN + len)) {
173 qcaspi_spi_error(qca);
174 return 0;
175 }
176
177 return len;
178}
179
180static u32
181qcaspi_read_legacy(struct qcaspi *qca, u8 *dst, u32 len)
182{
183 struct spi_message msg;
184 struct spi_transfer transfer;
185 int ret;
186
187 memset(&transfer, 0, sizeof(transfer));
188 spi_message_init(&msg);
189
190 transfer.rx_buf = dst;
191 transfer.len = len;
192
193 spi_message_add_tail(&transfer, &msg);
194 ret = spi_sync(qca->spi_dev, &msg);
195
196 if (ret || (msg.actual_length != len)) {
197 qcaspi_spi_error(qca);
198 return 0;
199 }
200
201 return len;
202}
203
204static int
205qcaspi_tx_cmd(struct qcaspi *qca, u16 cmd)
206{
207 __be16 tx_data;
208 struct spi_message msg;
209 struct spi_transfer transfer;
210 int ret;
211
212 memset(&transfer, 0, sizeof(transfer));
213
214 spi_message_init(&msg);
215
216 tx_data = cpu_to_be16(cmd);
217 transfer.len = sizeof(cmd);
218 transfer.tx_buf = &tx_data;
219 spi_message_add_tail(&transfer, &msg);
220
221 ret = spi_sync(qca->spi_dev, &msg);
222
223 if (!ret)
224 ret = msg.status;
225
226 if (ret)
227 qcaspi_spi_error(qca);
228
229 return ret;
230}
231
232static int
233qcaspi_tx_frame(struct qcaspi *qca, struct sk_buff *skb)
234{
235 u32 count;
236 u32 written;
237 u32 offset;
238 u32 len;
239
240 len = skb->len;
241
242 qcaspi_write_register(qca, SPI_REG_BFR_SIZE, len);
243 if (qca->legacy_mode)
244 qcaspi_tx_cmd(qca, QCA7K_SPI_WRITE | QCA7K_SPI_EXTERNAL);
245
246 offset = 0;
247 while (len) {
248 count = len;
249 if (count > qca->burst_len)
250 count = qca->burst_len;
251
252 if (qca->legacy_mode) {
253 written = qcaspi_write_legacy(qca,
254 skb->data + offset,
255 count);
256 } else {
257 written = qcaspi_write_burst(qca,
258 skb->data + offset,
259 count);
260 }
261
262 if (written != count)
263 return -1;
264
265 offset += count;
266 len -= count;
267 }
268
269 return 0;
270}
271
272static int
273qcaspi_transmit(struct qcaspi *qca)
274{
275 struct net_device_stats *n_stats = &qca->net_dev->stats;
276 u16 available = 0;
277 u32 pkt_len;
278 u16 new_head;
279 u16 packets = 0;
280
281 if (qca->txr.skb[qca->txr.head] == NULL)
282 return 0;
283
284 qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA, &available);
285
286 while (qca->txr.skb[qca->txr.head]) {
287 pkt_len = qca->txr.skb[qca->txr.head]->len + QCASPI_HW_PKT_LEN;
288
289 if (available < pkt_len) {
290 if (packets == 0)
291 qca->stats.write_buf_miss++;
292 break;
293 }
294
295 if (qcaspi_tx_frame(qca, qca->txr.skb[qca->txr.head]) == -1) {
296 qca->stats.write_err++;
297 return -1;
298 }
299
300 packets++;
301 n_stats->tx_packets++;
302 n_stats->tx_bytes += qca->txr.skb[qca->txr.head]->len;
303 available -= pkt_len;
304
305
306
307
308
309 netif_tx_lock_bh(qca->net_dev);
310 dev_kfree_skb(qca->txr.skb[qca->txr.head]);
311 qca->txr.skb[qca->txr.head] = NULL;
312 qca->txr.size -= pkt_len;
313 new_head = qca->txr.head + 1;
314 if (new_head >= qca->txr.count)
315 new_head = 0;
316 qca->txr.head = new_head;
317 if (netif_queue_stopped(qca->net_dev))
318 netif_wake_queue(qca->net_dev);
319 netif_tx_unlock_bh(qca->net_dev);
320 }
321
322 return 0;
323}
324
325static int
326qcaspi_receive(struct qcaspi *qca)
327{
328 struct net_device *net_dev = qca->net_dev;
329 struct net_device_stats *n_stats = &net_dev->stats;
330 u16 available = 0;
331 u32 bytes_read;
332 u8 *cp;
333
334
335 if (!qca->rx_skb) {
336 qca->rx_skb = netdev_alloc_skb_ip_align(net_dev,
337 net_dev->mtu +
338 VLAN_ETH_HLEN);
339 if (!qca->rx_skb) {
340 netdev_dbg(net_dev, "out of RX resources\n");
341 qca->stats.out_of_mem++;
342 return -1;
343 }
344 }
345
346
347 qcaspi_read_register(qca, SPI_REG_RDBUF_BYTE_AVA, &available);
348 netdev_dbg(net_dev, "qcaspi_receive: SPI_REG_RDBUF_BYTE_AVA: Value: %08x\n",
349 available);
350
351 if (available == 0) {
352 netdev_dbg(net_dev, "qcaspi_receive called without any data being available!\n");
353 return -1;
354 }
355
356 qcaspi_write_register(qca, SPI_REG_BFR_SIZE, available);
357
358 if (qca->legacy_mode)
359 qcaspi_tx_cmd(qca, QCA7K_SPI_READ | QCA7K_SPI_EXTERNAL);
360
361 while (available) {
362 u32 count = available;
363
364 if (count > qca->burst_len)
365 count = qca->burst_len;
366
367 if (qca->legacy_mode) {
368 bytes_read = qcaspi_read_legacy(qca, qca->rx_buffer,
369 count);
370 } else {
371 bytes_read = qcaspi_read_burst(qca, qca->rx_buffer,
372 count);
373 }
374
375 netdev_dbg(net_dev, "available: %d, byte read: %d\n",
376 available, bytes_read);
377
378 if (bytes_read) {
379 available -= bytes_read;
380 } else {
381 qca->stats.read_err++;
382 return -1;
383 }
384
385 cp = qca->rx_buffer;
386
387 while ((bytes_read--) && (qca->rx_skb)) {
388 s32 retcode;
389
390 retcode = qcafrm_fsm_decode(&qca->frm_handle,
391 qca->rx_skb->data,
392 skb_tailroom(qca->rx_skb),
393 *cp);
394 cp++;
395 switch (retcode) {
396 case QCAFRM_GATHER:
397 case QCAFRM_NOHEAD:
398 break;
399 case QCAFRM_NOTAIL:
400 netdev_dbg(net_dev, "no RX tail\n");
401 n_stats->rx_errors++;
402 n_stats->rx_dropped++;
403 break;
404 case QCAFRM_INVLEN:
405 netdev_dbg(net_dev, "invalid RX length\n");
406 n_stats->rx_errors++;
407 n_stats->rx_dropped++;
408 break;
409 default:
410 qca->rx_skb->dev = qca->net_dev;
411 n_stats->rx_packets++;
412 n_stats->rx_bytes += retcode;
413 skb_put(qca->rx_skb, retcode);
414 qca->rx_skb->protocol = eth_type_trans(
415 qca->rx_skb, qca->rx_skb->dev);
416 qca->rx_skb->ip_summed = CHECKSUM_UNNECESSARY;
417 netif_rx_ni(qca->rx_skb);
418 qca->rx_skb = netdev_alloc_skb_ip_align(net_dev,
419 net_dev->mtu + VLAN_ETH_HLEN);
420 if (!qca->rx_skb) {
421 netdev_dbg(net_dev, "out of RX resources\n");
422 n_stats->rx_errors++;
423 qca->stats.out_of_mem++;
424 break;
425 }
426 }
427 }
428 }
429
430 return 0;
431}
432
433
434
435
436
437static int
438qcaspi_tx_ring_has_space(struct tx_ring *txr)
439{
440 if (txr->skb[txr->tail])
441 return 0;
442
443 return (txr->size + QCAFRM_MAX_LEN < QCASPI_HW_BUF_LEN) ? 1 : 0;
444}
445
446
447
448
449
450static void
451qcaspi_flush_tx_ring(struct qcaspi *qca)
452{
453 int i;
454
455
456
457
458 netif_tx_lock_bh(qca->net_dev);
459 for (i = 0; i < TX_RING_MAX_LEN; i++) {
460 if (qca->txr.skb[i]) {
461 dev_kfree_skb(qca->txr.skb[i]);
462 qca->txr.skb[i] = NULL;
463 qca->net_dev->stats.tx_dropped++;
464 }
465 }
466 qca->txr.tail = 0;
467 qca->txr.head = 0;
468 qca->txr.size = 0;
469 netif_tx_unlock_bh(qca->net_dev);
470}
471
472static void
473qcaspi_qca7k_sync(struct qcaspi *qca, int event)
474{
475 u16 signature = 0;
476 u16 spi_config;
477 u16 wrbuf_space = 0;
478 static u16 reset_count;
479
480 if (event == QCASPI_EVENT_CPUON) {
481
482
483
484 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
485 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
486 if (signature != QCASPI_GOOD_SIGNATURE) {
487 qca->sync = QCASPI_SYNC_UNKNOWN;
488 netdev_dbg(qca->net_dev, "sync: got CPU on, but signature was invalid, restart\n");
489 } else {
490
491 qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA,
492 &wrbuf_space);
493 if (wrbuf_space != QCASPI_HW_BUF_LEN) {
494 netdev_dbg(qca->net_dev, "sync: got CPU on, but wrbuf not empty. reset!\n");
495 qca->sync = QCASPI_SYNC_UNKNOWN;
496 } else {
497 netdev_dbg(qca->net_dev, "sync: got CPU on, now in sync\n");
498 qca->sync = QCASPI_SYNC_READY;
499 return;
500 }
501 }
502 }
503
504 switch (qca->sync) {
505 case QCASPI_SYNC_READY:
506
507 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
508 if (signature != QCASPI_GOOD_SIGNATURE) {
509 qca->sync = QCASPI_SYNC_UNKNOWN;
510 netdev_dbg(qca->net_dev, "sync: bad signature, restart\n");
511
512 return;
513 }
514 break;
515 case QCASPI_SYNC_UNKNOWN:
516
517 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
518 if (signature != QCASPI_GOOD_SIGNATURE) {
519 netdev_dbg(qca->net_dev, "sync: could not read signature to reset device, retry.\n");
520 return;
521 }
522
523
524 netdev_dbg(qca->net_dev, "sync: resetting device.\n");
525 qcaspi_read_register(qca, SPI_REG_SPI_CONFIG, &spi_config);
526 spi_config |= QCASPI_SLAVE_RESET_BIT;
527 qcaspi_write_register(qca, SPI_REG_SPI_CONFIG, spi_config);
528
529 qca->sync = QCASPI_SYNC_RESET;
530 qca->stats.trig_reset++;
531 reset_count = 0;
532 break;
533 case QCASPI_SYNC_RESET:
534 reset_count++;
535 netdev_dbg(qca->net_dev, "sync: waiting for CPU on, count %u.\n",
536 reset_count);
537 if (reset_count >= QCASPI_RESET_TIMEOUT) {
538
539 qca->sync = QCASPI_SYNC_UNKNOWN;
540 qca->stats.reset_timeout++;
541 netdev_dbg(qca->net_dev, "sync: reset timeout, restarting process.\n");
542 }
543 break;
544 }
545}
546
547static int
548qcaspi_spi_thread(void *data)
549{
550 struct qcaspi *qca = data;
551 u16 intr_cause = 0;
552
553 netdev_info(qca->net_dev, "SPI thread created\n");
554 while (!kthread_should_stop()) {
555 set_current_state(TASK_INTERRUPTIBLE);
556 if ((qca->intr_req == qca->intr_svc) &&
557 (qca->txr.skb[qca->txr.head] == NULL) &&
558 (qca->sync == QCASPI_SYNC_READY))
559 schedule();
560
561 set_current_state(TASK_RUNNING);
562
563 netdev_dbg(qca->net_dev, "have work to do. int: %d, tx_skb: %p\n",
564 qca->intr_req - qca->intr_svc,
565 qca->txr.skb[qca->txr.head]);
566
567 qcaspi_qca7k_sync(qca, QCASPI_EVENT_UPDATE);
568
569 if (qca->sync != QCASPI_SYNC_READY) {
570 netdev_dbg(qca->net_dev, "sync: not ready %u, turn off carrier and flush\n",
571 (unsigned int)qca->sync);
572 netif_stop_queue(qca->net_dev);
573 netif_carrier_off(qca->net_dev);
574 qcaspi_flush_tx_ring(qca);
575 msleep(QCASPI_QCA7K_REBOOT_TIME_MS);
576 }
577
578 if (qca->intr_svc != qca->intr_req) {
579 qca->intr_svc = qca->intr_req;
580 start_spi_intr_handling(qca, &intr_cause);
581
582 if (intr_cause & SPI_INT_CPU_ON) {
583 qcaspi_qca7k_sync(qca, QCASPI_EVENT_CPUON);
584
585
586 if (qca->sync != QCASPI_SYNC_READY)
587 continue;
588
589 qca->stats.device_reset++;
590 netif_wake_queue(qca->net_dev);
591 netif_carrier_on(qca->net_dev);
592 }
593
594 if (intr_cause & SPI_INT_RDBUF_ERR) {
595
596 netdev_dbg(qca->net_dev, "===> rdbuf error!\n");
597 qca->stats.read_buf_err++;
598 qca->sync = QCASPI_SYNC_UNKNOWN;
599 continue;
600 }
601
602 if (intr_cause & SPI_INT_WRBUF_ERR) {
603
604 netdev_dbg(qca->net_dev, "===> wrbuf error!\n");
605 qca->stats.write_buf_err++;
606 qca->sync = QCASPI_SYNC_UNKNOWN;
607 continue;
608 }
609
610
611
612
613 if (qca->sync == QCASPI_SYNC_READY) {
614 if (intr_cause & SPI_INT_PKT_AVLBL)
615 qcaspi_receive(qca);
616 }
617
618 end_spi_intr_handling(qca, intr_cause);
619 }
620
621 if (qca->sync == QCASPI_SYNC_READY)
622 qcaspi_transmit(qca);
623 }
624 set_current_state(TASK_RUNNING);
625 netdev_info(qca->net_dev, "SPI thread exit\n");
626
627 return 0;
628}
629
630static irqreturn_t
631qcaspi_intr_handler(int irq, void *data)
632{
633 struct qcaspi *qca = data;
634
635 qca->intr_req++;
636 if (qca->spi_thread &&
637 qca->spi_thread->state != TASK_RUNNING)
638 wake_up_process(qca->spi_thread);
639
640 return IRQ_HANDLED;
641}
642
643static int
644qcaspi_netdev_open(struct net_device *dev)
645{
646 struct qcaspi *qca = netdev_priv(dev);
647 int ret = 0;
648
649 if (!qca)
650 return -EINVAL;
651
652 qca->intr_req = 1;
653 qca->intr_svc = 0;
654 qca->sync = QCASPI_SYNC_UNKNOWN;
655 qcafrm_fsm_init_spi(&qca->frm_handle);
656
657 qca->spi_thread = kthread_run((void *)qcaspi_spi_thread,
658 qca, "%s", dev->name);
659
660 if (IS_ERR(qca->spi_thread)) {
661 netdev_err(dev, "%s: unable to start kernel thread.\n",
662 QCASPI_DRV_NAME);
663 return PTR_ERR(qca->spi_thread);
664 }
665
666 ret = request_irq(qca->spi_dev->irq, qcaspi_intr_handler, 0,
667 dev->name, qca);
668 if (ret) {
669 netdev_err(dev, "%s: unable to get IRQ %d (irqval=%d).\n",
670 QCASPI_DRV_NAME, qca->spi_dev->irq, ret);
671 kthread_stop(qca->spi_thread);
672 return ret;
673 }
674
675
676
677 return 0;
678}
679
680static int
681qcaspi_netdev_close(struct net_device *dev)
682{
683 struct qcaspi *qca = netdev_priv(dev);
684
685 netif_stop_queue(dev);
686
687 qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, 0);
688 free_irq(qca->spi_dev->irq, qca);
689
690 kthread_stop(qca->spi_thread);
691 qca->spi_thread = NULL;
692 qcaspi_flush_tx_ring(qca);
693
694 return 0;
695}
696
697static netdev_tx_t
698qcaspi_netdev_xmit(struct sk_buff *skb, struct net_device *dev)
699{
700 u32 frame_len;
701 u8 *ptmp;
702 struct qcaspi *qca = netdev_priv(dev);
703 u16 new_tail;
704 struct sk_buff *tskb;
705 u8 pad_len = 0;
706
707 if (skb->len < QCAFRM_MIN_LEN)
708 pad_len = QCAFRM_MIN_LEN - skb->len;
709
710 if (qca->txr.skb[qca->txr.tail]) {
711 netdev_warn(qca->net_dev, "queue was unexpectedly full!\n");
712 netif_stop_queue(qca->net_dev);
713 qca->stats.ring_full++;
714 return NETDEV_TX_BUSY;
715 }
716
717 if ((skb_headroom(skb) < QCAFRM_HEADER_LEN) ||
718 (skb_tailroom(skb) < QCAFRM_FOOTER_LEN + pad_len)) {
719 tskb = skb_copy_expand(skb, QCAFRM_HEADER_LEN,
720 QCAFRM_FOOTER_LEN + pad_len, GFP_ATOMIC);
721 if (!tskb) {
722 qca->stats.out_of_mem++;
723 return NETDEV_TX_BUSY;
724 }
725 dev_kfree_skb(skb);
726 skb = tskb;
727 }
728
729 frame_len = skb->len + pad_len;
730
731 ptmp = skb_push(skb, QCAFRM_HEADER_LEN);
732 qcafrm_create_header(ptmp, frame_len);
733
734 if (pad_len) {
735 ptmp = skb_put_zero(skb, pad_len);
736 }
737
738 ptmp = skb_put(skb, QCAFRM_FOOTER_LEN);
739 qcafrm_create_footer(ptmp);
740
741 netdev_dbg(qca->net_dev, "Tx-ing packet: Size: 0x%08x\n",
742 skb->len);
743
744 qca->txr.size += skb->len + QCASPI_HW_PKT_LEN;
745
746 new_tail = qca->txr.tail + 1;
747 if (new_tail >= qca->txr.count)
748 new_tail = 0;
749
750 qca->txr.skb[qca->txr.tail] = skb;
751 qca->txr.tail = new_tail;
752
753 if (!qcaspi_tx_ring_has_space(&qca->txr)) {
754 netif_stop_queue(qca->net_dev);
755 qca->stats.ring_full++;
756 }
757
758 netif_trans_update(dev);
759
760 if (qca->spi_thread &&
761 qca->spi_thread->state != TASK_RUNNING)
762 wake_up_process(qca->spi_thread);
763
764 return NETDEV_TX_OK;
765}
766
767static void
768qcaspi_netdev_tx_timeout(struct net_device *dev)
769{
770 struct qcaspi *qca = netdev_priv(dev);
771
772 netdev_info(qca->net_dev, "Transmit timeout at %ld, latency %ld\n",
773 jiffies, jiffies - dev_trans_start(dev));
774 qca->net_dev->stats.tx_errors++;
775
776 qca->sync = QCASPI_SYNC_UNKNOWN;
777
778 if (qca->spi_thread)
779 wake_up_process(qca->spi_thread);
780}
781
782static int
783qcaspi_netdev_init(struct net_device *dev)
784{
785 struct qcaspi *qca = netdev_priv(dev);
786
787 dev->mtu = QCAFRM_MAX_MTU;
788 dev->type = ARPHRD_ETHER;
789 qca->clkspeed = qcaspi_clkspeed;
790 qca->burst_len = qcaspi_burst_len;
791 qca->spi_thread = NULL;
792 qca->buffer_size = (dev->mtu + VLAN_ETH_HLEN + QCAFRM_HEADER_LEN +
793 QCAFRM_FOOTER_LEN + 4) * 4;
794
795 memset(&qca->stats, 0, sizeof(struct qcaspi_stats));
796
797 qca->rx_buffer = kmalloc(qca->buffer_size, GFP_KERNEL);
798 if (!qca->rx_buffer)
799 return -ENOBUFS;
800
801 qca->rx_skb = netdev_alloc_skb_ip_align(dev, qca->net_dev->mtu +
802 VLAN_ETH_HLEN);
803 if (!qca->rx_skb) {
804 kfree(qca->rx_buffer);
805 netdev_info(qca->net_dev, "Failed to allocate RX sk_buff.\n");
806 return -ENOBUFS;
807 }
808
809 return 0;
810}
811
812static void
813qcaspi_netdev_uninit(struct net_device *dev)
814{
815 struct qcaspi *qca = netdev_priv(dev);
816
817 kfree(qca->rx_buffer);
818 qca->buffer_size = 0;
819 if (qca->rx_skb)
820 dev_kfree_skb(qca->rx_skb);
821}
822
823static const struct net_device_ops qcaspi_netdev_ops = {
824 .ndo_init = qcaspi_netdev_init,
825 .ndo_uninit = qcaspi_netdev_uninit,
826 .ndo_open = qcaspi_netdev_open,
827 .ndo_stop = qcaspi_netdev_close,
828 .ndo_start_xmit = qcaspi_netdev_xmit,
829 .ndo_set_mac_address = eth_mac_addr,
830 .ndo_tx_timeout = qcaspi_netdev_tx_timeout,
831 .ndo_validate_addr = eth_validate_addr,
832};
833
834static void
835qcaspi_netdev_setup(struct net_device *dev)
836{
837 struct qcaspi *qca = NULL;
838
839 dev->netdev_ops = &qcaspi_netdev_ops;
840 qcaspi_set_ethtool_ops(dev);
841 dev->watchdog_timeo = QCASPI_TX_TIMEOUT;
842 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
843 dev->tx_queue_len = 100;
844
845
846 dev->min_mtu = QCAFRM_MIN_MTU;
847 dev->max_mtu = QCAFRM_MAX_MTU;
848
849 qca = netdev_priv(dev);
850 memset(qca, 0, sizeof(struct qcaspi));
851
852 memset(&qca->txr, 0, sizeof(qca->txr));
853 qca->txr.count = TX_RING_MAX_LEN;
854}
855
856static const struct of_device_id qca_spi_of_match[] = {
857 { .compatible = "qca,qca7000" },
858 { }
859};
860MODULE_DEVICE_TABLE(of, qca_spi_of_match);
861
862static int
863qca_spi_probe(struct spi_device *spi)
864{
865 struct qcaspi *qca = NULL;
866 struct net_device *qcaspi_devs = NULL;
867 u8 legacy_mode = 0;
868 u16 signature;
869 const char *mac;
870
871 if (!spi->dev.of_node) {
872 dev_err(&spi->dev, "Missing device tree\n");
873 return -EINVAL;
874 }
875
876 legacy_mode = of_property_read_bool(spi->dev.of_node,
877 "qca,legacy-mode");
878
879 if (qcaspi_clkspeed == 0) {
880 if (spi->max_speed_hz)
881 qcaspi_clkspeed = spi->max_speed_hz;
882 else
883 qcaspi_clkspeed = QCASPI_CLK_SPEED;
884 }
885
886 if ((qcaspi_clkspeed < QCASPI_CLK_SPEED_MIN) ||
887 (qcaspi_clkspeed > QCASPI_CLK_SPEED_MAX)) {
888 dev_err(&spi->dev, "Invalid clkspeed: %d\n",
889 qcaspi_clkspeed);
890 return -EINVAL;
891 }
892
893 if ((qcaspi_burst_len < QCASPI_BURST_LEN_MIN) ||
894 (qcaspi_burst_len > QCASPI_BURST_LEN_MAX)) {
895 dev_err(&spi->dev, "Invalid burst len: %d\n",
896 qcaspi_burst_len);
897 return -EINVAL;
898 }
899
900 if ((qcaspi_pluggable < QCASPI_PLUGGABLE_MIN) ||
901 (qcaspi_pluggable > QCASPI_PLUGGABLE_MAX)) {
902 dev_err(&spi->dev, "Invalid pluggable: %d\n",
903 qcaspi_pluggable);
904 return -EINVAL;
905 }
906
907 dev_info(&spi->dev, "ver=%s, clkspeed=%d, burst_len=%d, pluggable=%d\n",
908 QCASPI_DRV_VERSION,
909 qcaspi_clkspeed,
910 qcaspi_burst_len,
911 qcaspi_pluggable);
912
913 spi->mode = SPI_MODE_3;
914 spi->max_speed_hz = qcaspi_clkspeed;
915 if (spi_setup(spi) < 0) {
916 dev_err(&spi->dev, "Unable to setup SPI device\n");
917 return -EFAULT;
918 }
919
920 qcaspi_devs = alloc_etherdev(sizeof(struct qcaspi));
921 if (!qcaspi_devs)
922 return -ENOMEM;
923
924 qcaspi_netdev_setup(qcaspi_devs);
925 SET_NETDEV_DEV(qcaspi_devs, &spi->dev);
926
927 qca = netdev_priv(qcaspi_devs);
928 if (!qca) {
929 free_netdev(qcaspi_devs);
930 dev_err(&spi->dev, "Fail to retrieve private structure\n");
931 return -ENOMEM;
932 }
933 qca->net_dev = qcaspi_devs;
934 qca->spi_dev = spi;
935 qca->legacy_mode = legacy_mode;
936
937 spi_set_drvdata(spi, qcaspi_devs);
938
939 mac = of_get_mac_address(spi->dev.of_node);
940
941 if (mac)
942 ether_addr_copy(qca->net_dev->dev_addr, mac);
943
944 if (!is_valid_ether_addr(qca->net_dev->dev_addr)) {
945 eth_hw_addr_random(qca->net_dev);
946 dev_info(&spi->dev, "Using random MAC address: %pM\n",
947 qca->net_dev->dev_addr);
948 }
949
950 netif_carrier_off(qca->net_dev);
951
952 if (!qcaspi_pluggable) {
953 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
954 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
955
956 if (signature != QCASPI_GOOD_SIGNATURE) {
957 dev_err(&spi->dev, "Invalid signature (0x%04X)\n",
958 signature);
959 free_netdev(qcaspi_devs);
960 return -EFAULT;
961 }
962 }
963
964 if (register_netdev(qcaspi_devs)) {
965 dev_err(&spi->dev, "Unable to register net device %s\n",
966 qcaspi_devs->name);
967 free_netdev(qcaspi_devs);
968 return -EFAULT;
969 }
970
971 qcaspi_init_device_debugfs(qca);
972
973 return 0;
974}
975
976static int
977qca_spi_remove(struct spi_device *spi)
978{
979 struct net_device *qcaspi_devs = spi_get_drvdata(spi);
980 struct qcaspi *qca = netdev_priv(qcaspi_devs);
981
982 qcaspi_remove_device_debugfs(qca);
983
984 unregister_netdev(qcaspi_devs);
985 free_netdev(qcaspi_devs);
986
987 return 0;
988}
989
990static const struct spi_device_id qca_spi_id[] = {
991 { "qca7000", 0 },
992 { }
993};
994MODULE_DEVICE_TABLE(spi, qca_spi_id);
995
996static struct spi_driver qca_spi_driver = {
997 .driver = {
998 .name = QCASPI_DRV_NAME,
999 .of_match_table = qca_spi_of_match,
1000 },
1001 .id_table = qca_spi_id,
1002 .probe = qca_spi_probe,
1003 .remove = qca_spi_remove,
1004};
1005module_spi_driver(qca_spi_driver);
1006
1007MODULE_DESCRIPTION("Qualcomm Atheros QCA7000 SPI Driver");
1008MODULE_AUTHOR("Qualcomm Atheros Communications");
1009MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
1010MODULE_LICENSE("Dual BSD/GPL");
1011MODULE_VERSION(QCASPI_DRV_VERSION);
1012
