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staging: rtl8188eu: Replace function name in string with __func__
[linux/fpc-iii.git] / drivers / net / ethernet / qualcomm / qca_spi.c
blob9c236298fe2125cf26afef756cfd5f3f7250098b
1 /*
2 * Copyright (c) 2011, 2012, Qualcomm Atheros Communications Inc.
3 * Copyright (c) 2014, I2SE GmbH
4 *
5 * Permission to use, copy, modify, and/or distribute this software
6 * for any purpose with or without fee is hereby granted, provided
7 * that the above copyright notice and this permission notice appear
8 * in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
11 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
12 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
13 * THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
14 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
16 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
17 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 /* This module implements the Qualcomm Atheros SPI protocol for
21 * kernel-based SPI device; it is essentially an Ethernet-to-SPI
22 * serial converter;
23 */
24
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 /* Modules parameters */
53 #define QCASPI_CLK_SPEED_MIN 1000000
54 #define QCASPI_CLK_SPEED_MAX 16000000
55 #define QCASPI_CLK_SPEED 8000000
56 static int qcaspi_clkspeed;
57 module_param(qcaspi_clkspeed, int, 0);
58 MODULE_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
62 static int qcaspi_burst_len = MAX_DMA_BURST_LEN;
63 module_param(qcaspi_burst_len, int, 0);
64 MODULE_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
68 static int qcaspi_pluggable = QCASPI_PLUGGABLE_MIN;
69 module_param(qcaspi_pluggable, int, 0);
70 MODULE_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
75 static void
76 start_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
85 static void
86 end_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
98 static u32
99 qcaspi_write_burst(struct qcaspi *qca, u8 *src, u32 len)
100 {
101 __be16 cmd;
102 struct spi_message *msg = &qca->spi_msg2;
103 struct spi_transfer *transfer = &qca->spi_xfer2[0];
104 int ret;
105
106 cmd = cpu_to_be16(QCA7K_SPI_WRITE | QCA7K_SPI_EXTERNAL);
107 transfer->tx_buf = &cmd;
108 transfer->rx_buf = NULL;
109 transfer->len = QCASPI_CMD_LEN;
110 transfer = &qca->spi_xfer2[1];
111 transfer->tx_buf = src;
112 transfer->rx_buf = NULL;
113 transfer->len = len;
114
115 ret = spi_sync(qca->spi_dev, msg);
116
117 if (ret || (msg->actual_length != QCASPI_CMD_LEN + len)) {
118 qcaspi_spi_error(qca);
119 return 0;
120 }
121
122 return len;
123 }
124
125 static u32
126 qcaspi_write_legacy(struct qcaspi *qca, u8 *src, u32 len)
127 {
128 struct spi_message *msg = &qca->spi_msg1;
129 struct spi_transfer *transfer = &qca->spi_xfer1;
130 int ret;
131
132 transfer->tx_buf = src;
133 transfer->rx_buf = NULL;
134 transfer->len = len;
135
136 ret = spi_sync(qca->spi_dev, msg);
137
138 if (ret || (msg->actual_length != len)) {
139 qcaspi_spi_error(qca);
140 return 0;
141 }
142
143 return len;
144 }
145
146 static u32
147 qcaspi_read_burst(struct qcaspi *qca, u8 *dst, u32 len)
148 {
149 struct spi_message *msg = &qca->spi_msg2;
150 __be16 cmd;
151 struct spi_transfer *transfer = &qca->spi_xfer2[0];
152 int ret;
153
154 cmd = cpu_to_be16(QCA7K_SPI_READ | QCA7K_SPI_EXTERNAL);
155 transfer->tx_buf = &cmd;
156 transfer->rx_buf = NULL;
157 transfer->len = QCASPI_CMD_LEN;
158 transfer = &qca->spi_xfer2[1];
159 transfer->tx_buf = NULL;
160 transfer->rx_buf = dst;
161 transfer->len = len;
162
163 ret = spi_sync(qca->spi_dev, msg);
164
165 if (ret || (msg->actual_length != QCASPI_CMD_LEN + len)) {
166 qcaspi_spi_error(qca);
167 return 0;
168 }
169
170 return len;
171 }
172
173 static u32
174 qcaspi_read_legacy(struct qcaspi *qca, u8 *dst, u32 len)
175 {
176 struct spi_message *msg = &qca->spi_msg1;
177 struct spi_transfer *transfer = &qca->spi_xfer1;
178 int ret;
179
180 transfer->tx_buf = NULL;
181 transfer->rx_buf = dst;
182 transfer->len = len;
183
184 ret = spi_sync(qca->spi_dev, msg);
185
186 if (ret || (msg->actual_length != len)) {
187 qcaspi_spi_error(qca);
188 return 0;
189 }
190
191 return len;
192 }
193
194 static int
195 qcaspi_tx_cmd(struct qcaspi *qca, u16 cmd)
196 {
197 __be16 tx_data;
198 struct spi_message *msg = &qca->spi_msg1;
199 struct spi_transfer *transfer = &qca->spi_xfer1;
200 int ret;
201
202 tx_data = cpu_to_be16(cmd);
203 transfer->len = sizeof(tx_data);
204 transfer->tx_buf = &tx_data;
205 transfer->rx_buf = NULL;
206
207 ret = spi_sync(qca->spi_dev, msg);
208
209 if (!ret)
210 ret = msg->status;
211
212 if (ret)
213 qcaspi_spi_error(qca);
214
215 return ret;
216 }
217
218 static int
219 qcaspi_tx_frame(struct qcaspi *qca, struct sk_buff *skb)
220 {
221 u32 count;
222 u32 written;
223 u32 offset;
224 u32 len;
225
226 len = skb->len;
227
228 qcaspi_write_register(qca, SPI_REG_BFR_SIZE, len);
229 if (qca->legacy_mode)
230 qcaspi_tx_cmd(qca, QCA7K_SPI_WRITE | QCA7K_SPI_EXTERNAL);
231
232 offset = 0;
233 while (len) {
234 count = len;
235 if (count > qca->burst_len)
236 count = qca->burst_len;
237
238 if (qca->legacy_mode) {
239 written = qcaspi_write_legacy(qca,
240 skb->data + offset,
241 count);
242 } else {
243 written = qcaspi_write_burst(qca,
244 skb->data + offset,
245 count);
246 }
247
248 if (written != count)
249 return -1;
250
251 offset += count;
252 len -= count;
253 }
254
255 return 0;
256 }
257
258 static int
259 qcaspi_transmit(struct qcaspi *qca)
260 {
261 struct net_device_stats *n_stats = &qca->net_dev->stats;
262 u16 available = 0;
263 u32 pkt_len;
264 u16 new_head;
265 u16 packets = 0;
266
267 if (qca->txr.skb[qca->txr.head] == NULL)
268 return 0;
269
270 qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA, &available);
271
272 while (qca->txr.skb[qca->txr.head]) {
273 pkt_len = qca->txr.skb[qca->txr.head]->len + QCASPI_HW_PKT_LEN;
274
275 if (available < pkt_len) {
276 if (packets == 0)
277 qca->stats.write_buf_miss++;
278 break;
279 }
280
281 if (qcaspi_tx_frame(qca, qca->txr.skb[qca->txr.head]) == -1) {
282 qca->stats.write_err++;
283 return -1;
284 }
285
286 packets++;
287 n_stats->tx_packets++;
288 n_stats->tx_bytes += qca->txr.skb[qca->txr.head]->len;
289 available -= pkt_len;
290
291 /* remove the skb from the queue */
292 /* XXX After inconsistent lock states netif_tx_lock()
293 * has been replaced by netif_tx_lock_bh() and so on.
294 */
295 netif_tx_lock_bh(qca->net_dev);
296 dev_kfree_skb(qca->txr.skb[qca->txr.head]);
297 qca->txr.skb[qca->txr.head] = NULL;
298 qca->txr.size -= pkt_len;
299 new_head = qca->txr.head + 1;
300 if (new_head >= qca->txr.count)
301 new_head = 0;
302 qca->txr.head = new_head;
303 if (netif_queue_stopped(qca->net_dev))
304 netif_wake_queue(qca->net_dev);
305 netif_tx_unlock_bh(qca->net_dev);
306 }
307
308 return 0;
309 }
310
311 static int
312 qcaspi_receive(struct qcaspi *qca)
313 {
314 struct net_device *net_dev = qca->net_dev;
315 struct net_device_stats *n_stats = &net_dev->stats;
316 u16 available = 0;
317 u32 bytes_read;
318 u8 *cp;
319
320 /* Allocate rx SKB if we don't have one available. */
321 if (!qca->rx_skb) {
322 qca->rx_skb = netdev_alloc_skb_ip_align(net_dev,
323 net_dev->mtu +
324 VLAN_ETH_HLEN);
325 if (!qca->rx_skb) {
326 netdev_dbg(net_dev, "out of RX resources\n");
327 qca->stats.out_of_mem++;
328 return -1;
329 }
330 }
331
332 /* Read the packet size. */
333 qcaspi_read_register(qca, SPI_REG_RDBUF_BYTE_AVA, &available);
334 netdev_dbg(net_dev, "qcaspi_receive: SPI_REG_RDBUF_BYTE_AVA: Value: %08x\n",
335 available);
336
337 if (available == 0) {
338 netdev_dbg(net_dev, "qcaspi_receive called without any data being available!\n");
339 return -1;
340 }
341
342 qcaspi_write_register(qca, SPI_REG_BFR_SIZE, available);
343
344 if (qca->legacy_mode)
345 qcaspi_tx_cmd(qca, QCA7K_SPI_READ | QCA7K_SPI_EXTERNAL);
346
347 while (available) {
348 u32 count = available;
349
350 if (count > qca->burst_len)
351 count = qca->burst_len;
352
353 if (qca->legacy_mode) {
354 bytes_read = qcaspi_read_legacy(qca, qca->rx_buffer,
355 count);
356 } else {
357 bytes_read = qcaspi_read_burst(qca, qca->rx_buffer,
358 count);
359 }
360
361 netdev_dbg(net_dev, "available: %d, byte read: %d\n",
362 available, bytes_read);
363
364 if (bytes_read) {
365 available -= bytes_read;
366 } else {
367 qca->stats.read_err++;
368 return -1;
369 }
370
371 cp = qca->rx_buffer;
372
373 while ((bytes_read--) && (qca->rx_skb)) {
374 s32 retcode;
375
376 retcode = qcafrm_fsm_decode(&qca->frm_handle,
377 qca->rx_skb->data,
378 skb_tailroom(qca->rx_skb),
379 *cp);
380 cp++;
381 switch (retcode) {
382 case QCAFRM_GATHER:
383 case QCAFRM_NOHEAD:
384 break;
385 case QCAFRM_NOTAIL:
386 netdev_dbg(net_dev, "no RX tail\n");
387 n_stats->rx_errors++;
388 n_stats->rx_dropped++;
389 break;
390 case QCAFRM_INVLEN:
391 netdev_dbg(net_dev, "invalid RX length\n");
392 n_stats->rx_errors++;
393 n_stats->rx_dropped++;
394 break;
395 default:
396 qca->rx_skb->dev = qca->net_dev;
397 n_stats->rx_packets++;
398 n_stats->rx_bytes += retcode;
399 skb_put(qca->rx_skb, retcode);
400 qca->rx_skb->protocol = eth_type_trans(
401 qca->rx_skb, qca->rx_skb->dev);
402 qca->rx_skb->ip_summed = CHECKSUM_UNNECESSARY;
403 netif_rx_ni(qca->rx_skb);
404 qca->rx_skb = netdev_alloc_skb_ip_align(net_dev,
405 net_dev->mtu + VLAN_ETH_HLEN);
406 if (!qca->rx_skb) {
407 netdev_dbg(net_dev, "out of RX resources\n");
408 n_stats->rx_errors++;
409 qca->stats.out_of_mem++;
410 break;
411 }
412 }
413 }
414 }
415
416 return 0;
417 }
418
419 /* Check that tx ring stores only so much bytes
420 * that fit into the internal QCA buffer.
421 */
422
423 static int
424 qcaspi_tx_ring_has_space(struct tx_ring *txr)
425 {
426 if (txr->skb[txr->tail])
427 return 0;
428
429 return (txr->size + QCAFRM_MAX_LEN < QCASPI_HW_BUF_LEN) ? 1 : 0;
430 }
431
432 /* Flush the tx ring. This function is only safe to
433 * call from the qcaspi_spi_thread.
434 */
435
436 static void
437 qcaspi_flush_tx_ring(struct qcaspi *qca)
438 {
439 int i;
440
441 /* XXX After inconsistent lock states netif_tx_lock()
442 * has been replaced by netif_tx_lock_bh() and so on.
443 */
444 netif_tx_lock_bh(qca->net_dev);
445 for (i = 0; i < TX_RING_MAX_LEN; i++) {
446 if (qca->txr.skb[i]) {
447 dev_kfree_skb(qca->txr.skb[i]);
448 qca->txr.skb[i] = NULL;
449 qca->net_dev->stats.tx_dropped++;
450 }
451 }
452 qca->txr.tail = 0;
453 qca->txr.head = 0;
454 qca->txr.size = 0;
455 netif_tx_unlock_bh(qca->net_dev);
456 }
457
458 static void
459 qcaspi_qca7k_sync(struct qcaspi *qca, int event)
460 {
461 u16 signature = 0;
462 u16 spi_config;
463 u16 wrbuf_space = 0;
464 static u16 reset_count;
465
466 if (event == QCASPI_EVENT_CPUON) {
467 /* Read signature twice, if not valid
468 * go back to unknown state.
469 */
470 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
471 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
472 if (signature != QCASPI_GOOD_SIGNATURE) {
473 qca->sync = QCASPI_SYNC_UNKNOWN;
474 netdev_dbg(qca->net_dev, "sync: got CPU on, but signature was invalid, restart\n");
475 } else {
476 /* ensure that the WRBUF is empty */
477 qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA,
478 &wrbuf_space);
479 if (wrbuf_space != QCASPI_HW_BUF_LEN) {
480 netdev_dbg(qca->net_dev, "sync: got CPU on, but wrbuf not empty. reset!\n");
481 qca->sync = QCASPI_SYNC_UNKNOWN;
482 } else {
483 netdev_dbg(qca->net_dev, "sync: got CPU on, now in sync\n");
484 qca->sync = QCASPI_SYNC_READY;
485 return;
486 }
487 }
488 }
489
490 switch (qca->sync) {
491 case QCASPI_SYNC_READY:
492 /* Read signature, if not valid go to unknown state. */
493 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
494 if (signature != QCASPI_GOOD_SIGNATURE) {
495 qca->sync = QCASPI_SYNC_UNKNOWN;
496 netdev_dbg(qca->net_dev, "sync: bad signature, restart\n");
497 /* don't reset right away */
498 return;
499 }
500 break;
501 case QCASPI_SYNC_UNKNOWN:
502 /* Read signature, if not valid stay in unknown state */
503 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
504 if (signature != QCASPI_GOOD_SIGNATURE) {
505 netdev_dbg(qca->net_dev, "sync: could not read signature to reset device, retry.\n");
506 return;
507 }
508
509 /* TODO: use GPIO to reset QCA7000 in legacy mode*/
510 netdev_dbg(qca->net_dev, "sync: resetting device.\n");
511 qcaspi_read_register(qca, SPI_REG_SPI_CONFIG, &spi_config);
512 spi_config |= QCASPI_SLAVE_RESET_BIT;
513 qcaspi_write_register(qca, SPI_REG_SPI_CONFIG, spi_config);
514
515 qca->sync = QCASPI_SYNC_RESET;
516 qca->stats.trig_reset++;
517 reset_count = 0;
518 break;
519 case QCASPI_SYNC_RESET:
520 reset_count++;
521 netdev_dbg(qca->net_dev, "sync: waiting for CPU on, count %u.\n",
522 reset_count);
523 if (reset_count >= QCASPI_RESET_TIMEOUT) {
524 /* reset did not seem to take place, try again */
525 qca->sync = QCASPI_SYNC_UNKNOWN;
526 qca->stats.reset_timeout++;
527 netdev_dbg(qca->net_dev, "sync: reset timeout, restarting process.\n");
528 }
529 break;
530 }
531 }
532
533 static int
534 qcaspi_spi_thread(void *data)
535 {
536 struct qcaspi *qca = data;
537 u16 intr_cause = 0;
538
539 netdev_info(qca->net_dev, "SPI thread created\n");
540 while (!kthread_should_stop()) {
541 set_current_state(TASK_INTERRUPTIBLE);
542 if ((qca->intr_req == qca->intr_svc) &&
543 (qca->txr.skb[qca->txr.head] == NULL) &&
544 (qca->sync == QCASPI_SYNC_READY))
545 schedule();
546
547 set_current_state(TASK_RUNNING);
548
549 netdev_dbg(qca->net_dev, "have work to do. int: %d, tx_skb: %p\n",
550 qca->intr_req - qca->intr_svc,
551 qca->txr.skb[qca->txr.head]);
552
553 qcaspi_qca7k_sync(qca, QCASPI_EVENT_UPDATE);
554
555 if (qca->sync != QCASPI_SYNC_READY) {
556 netdev_dbg(qca->net_dev, "sync: not ready %u, turn off carrier and flush\n",
557 (unsigned int)qca->sync);
558 netif_stop_queue(qca->net_dev);
559 netif_carrier_off(qca->net_dev);
560 qcaspi_flush_tx_ring(qca);
561 msleep(QCASPI_QCA7K_REBOOT_TIME_MS);
562 }
563
564 if (qca->intr_svc != qca->intr_req) {
565 qca->intr_svc = qca->intr_req;
566 start_spi_intr_handling(qca, &intr_cause);
567
568 if (intr_cause & SPI_INT_CPU_ON) {
569 qcaspi_qca7k_sync(qca, QCASPI_EVENT_CPUON);
570
571 /* not synced. */
572 if (qca->sync != QCASPI_SYNC_READY)
573 continue;
574
575 qca->stats.device_reset++;
576 netif_wake_queue(qca->net_dev);
577 netif_carrier_on(qca->net_dev);
578 }
579
580 if (intr_cause & SPI_INT_RDBUF_ERR) {
581 /* restart sync */
582 netdev_dbg(qca->net_dev, "===> rdbuf error!\n");
583 qca->stats.read_buf_err++;
584 qca->sync = QCASPI_SYNC_UNKNOWN;
585 continue;
586 }
587
588 if (intr_cause & SPI_INT_WRBUF_ERR) {
589 /* restart sync */
590 netdev_dbg(qca->net_dev, "===> wrbuf error!\n");
591 qca->stats.write_buf_err++;
592 qca->sync = QCASPI_SYNC_UNKNOWN;
593 continue;
594 }
595
596 /* can only handle other interrupts
597 * if sync has occurred
598 */
599 if (qca->sync == QCASPI_SYNC_READY) {
600 if (intr_cause & SPI_INT_PKT_AVLBL)
601 qcaspi_receive(qca);
602 }
603
604 end_spi_intr_handling(qca, intr_cause);
605 }
606
607 if (qca->sync == QCASPI_SYNC_READY)
608 qcaspi_transmit(qca);
609 }
610 set_current_state(TASK_RUNNING);
611 netdev_info(qca->net_dev, "SPI thread exit\n");
612
613 return 0;
614 }
615
616 static irqreturn_t
617 qcaspi_intr_handler(int irq, void *data)
618 {
619 struct qcaspi *qca = data;
620
621 qca->intr_req++;
622 if (qca->spi_thread &&
623 qca->spi_thread->state != TASK_RUNNING)
624 wake_up_process(qca->spi_thread);
625
626 return IRQ_HANDLED;
627 }
628
629 static int
630 qcaspi_netdev_open(struct net_device *dev)
631 {
632 struct qcaspi *qca = netdev_priv(dev);
633 int ret = 0;
634
635 if (!qca)
636 return -EINVAL;
637
638 qca->intr_req = 1;
639 qca->intr_svc = 0;
640 qca->sync = QCASPI_SYNC_UNKNOWN;
641 qcafrm_fsm_init_spi(&qca->frm_handle);
642
643 qca->spi_thread = kthread_run((void *)qcaspi_spi_thread,
644 qca, "%s", dev->name);
645
646 if (IS_ERR(qca->spi_thread)) {
647 netdev_err(dev, "%s: unable to start kernel thread.\n",
648 QCASPI_DRV_NAME);
649 return PTR_ERR(qca->spi_thread);
650 }
651
652 ret = request_irq(qca->spi_dev->irq, qcaspi_intr_handler, 0,
653 dev->name, qca);
654 if (ret) {
655 netdev_err(dev, "%s: unable to get IRQ %d (irqval=%d).\n",
656 QCASPI_DRV_NAME, qca->spi_dev->irq, ret);
657 kthread_stop(qca->spi_thread);
658 return ret;
659 }
660
661 netif_start_queue(qca->net_dev);
662
663 return 0;
664 }
665
666 static int
667 qcaspi_netdev_close(struct net_device *dev)
668 {
669 struct qcaspi *qca = netdev_priv(dev);
670
671 netif_stop_queue(dev);
672
673 qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, 0);
674 free_irq(qca->spi_dev->irq, qca);
675
676 kthread_stop(qca->spi_thread);
677 qca->spi_thread = NULL;
678 qcaspi_flush_tx_ring(qca);
679
680 return 0;
681 }
682
683 static netdev_tx_t
684 qcaspi_netdev_xmit(struct sk_buff *skb, struct net_device *dev)
685 {
686 u32 frame_len;
687 u8 *ptmp;
688 struct qcaspi *qca = netdev_priv(dev);
689 u16 new_tail;
690 struct sk_buff *tskb;
691 u8 pad_len = 0;
692
693 if (skb->len < QCAFRM_MIN_LEN)
694 pad_len = QCAFRM_MIN_LEN - skb->len;
695
696 if (qca->txr.skb[qca->txr.tail]) {
697 netdev_warn(qca->net_dev, "queue was unexpectedly full!\n");
698 netif_stop_queue(qca->net_dev);
699 qca->stats.ring_full++;
700 return NETDEV_TX_BUSY;
701 }
702
703 if ((skb_headroom(skb) < QCAFRM_HEADER_LEN) ||
704 (skb_tailroom(skb) < QCAFRM_FOOTER_LEN + pad_len)) {
705 tskb = skb_copy_expand(skb, QCAFRM_HEADER_LEN,
706 QCAFRM_FOOTER_LEN + pad_len, GFP_ATOMIC);
707 if (!tskb) {
708 netdev_dbg(qca->net_dev, "could not allocate tx_buff\n");
709 qca->stats.out_of_mem++;
710 return NETDEV_TX_BUSY;
711 }
712 dev_kfree_skb(skb);
713 skb = tskb;
714 }
715
716 frame_len = skb->len + pad_len;
717
718 ptmp = skb_push(skb, QCAFRM_HEADER_LEN);
719 qcafrm_create_header(ptmp, frame_len);
720
721 if (pad_len) {
722 ptmp = skb_put_zero(skb, pad_len);
723 }
724
725 ptmp = skb_put(skb, QCAFRM_FOOTER_LEN);
726 qcafrm_create_footer(ptmp);
727
728 netdev_dbg(qca->net_dev, "Tx-ing packet: Size: 0x%08x\n",
729 skb->len);
730
731 qca->txr.size += skb->len + QCASPI_HW_PKT_LEN;
732
733 new_tail = qca->txr.tail + 1;
734 if (new_tail >= qca->txr.count)
735 new_tail = 0;
736
737 qca->txr.skb[qca->txr.tail] = skb;
738 qca->txr.tail = new_tail;
739
740 if (!qcaspi_tx_ring_has_space(&qca->txr)) {
741 netif_stop_queue(qca->net_dev);
742 qca->stats.ring_full++;
743 }
744
745 netif_trans_update(dev);
746
747 if (qca->spi_thread &&
748 qca->spi_thread->state != TASK_RUNNING)
749 wake_up_process(qca->spi_thread);
750
751 return NETDEV_TX_OK;
752 }
753
754 static void
755 qcaspi_netdev_tx_timeout(struct net_device *dev)
756 {
757 struct qcaspi *qca = netdev_priv(dev);
758
759 netdev_info(qca->net_dev, "Transmit timeout at %ld, latency %ld\n",
760 jiffies, jiffies - dev_trans_start(dev));
761 qca->net_dev->stats.tx_errors++;
762 /* Trigger tx queue flush and QCA7000 reset */
763 qca->sync = QCASPI_SYNC_UNKNOWN;
764 }
765
766 static int
767 qcaspi_netdev_init(struct net_device *dev)
768 {
769 struct qcaspi *qca = netdev_priv(dev);
770
771 dev->mtu = QCAFRM_MAX_MTU;
772 dev->type = ARPHRD_ETHER;
773 qca->clkspeed = qcaspi_clkspeed;
774 qca->burst_len = qcaspi_burst_len;
775 qca->spi_thread = NULL;
776 qca->buffer_size = (dev->mtu + VLAN_ETH_HLEN + QCAFRM_HEADER_LEN +
777 QCAFRM_FOOTER_LEN + 4) * 4;
778
779 memset(&qca->stats, 0, sizeof(struct qcaspi_stats));
780
781 qca->rx_buffer = kmalloc(qca->buffer_size, GFP_KERNEL);
782 if (!qca->rx_buffer)
783 return -ENOBUFS;
784
785 qca->rx_skb = netdev_alloc_skb_ip_align(dev, qca->net_dev->mtu +
786 VLAN_ETH_HLEN);
787 if (!qca->rx_skb) {
788 kfree(qca->rx_buffer);
789 netdev_info(qca->net_dev, "Failed to allocate RX sk_buff.\n");
790 return -ENOBUFS;
791 }
792
793 return 0;
794 }
795
796 static void
797 qcaspi_netdev_uninit(struct net_device *dev)
798 {
799 struct qcaspi *qca = netdev_priv(dev);
800
801 kfree(qca->rx_buffer);
802 qca->buffer_size = 0;
803 if (qca->rx_skb)
804 dev_kfree_skb(qca->rx_skb);
805 }
806
807 static const struct net_device_ops qcaspi_netdev_ops = {
808 .ndo_init = qcaspi_netdev_init,
809 .ndo_uninit = qcaspi_netdev_uninit,
810 .ndo_open = qcaspi_netdev_open,
811 .ndo_stop = qcaspi_netdev_close,
812 .ndo_start_xmit = qcaspi_netdev_xmit,
813 .ndo_set_mac_address = eth_mac_addr,
814 .ndo_tx_timeout = qcaspi_netdev_tx_timeout,
815 .ndo_validate_addr = eth_validate_addr,
816 };
817
818 static void
819 qcaspi_netdev_setup(struct net_device *dev)
820 {
821 struct qcaspi *qca = NULL;
822
823 dev->netdev_ops = &qcaspi_netdev_ops;
824 qcaspi_set_ethtool_ops(dev);
825 dev->watchdog_timeo = QCASPI_TX_TIMEOUT;
826 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
827 dev->tx_queue_len = 100;
828
829 /* MTU range: 46 - 1500 */
830 dev->min_mtu = QCAFRM_MIN_MTU;
831 dev->max_mtu = QCAFRM_MAX_MTU;
832
833 qca = netdev_priv(dev);
834 memset(qca, 0, sizeof(struct qcaspi));
835
836 memset(&qca->spi_xfer1, 0, sizeof(struct spi_transfer));
837 memset(&qca->spi_xfer2, 0, sizeof(struct spi_transfer) * 2);
838
839 spi_message_init(&qca->spi_msg1);
840 spi_message_add_tail(&qca->spi_xfer1, &qca->spi_msg1);
841
842 spi_message_init(&qca->spi_msg2);
843 spi_message_add_tail(&qca->spi_xfer2[0], &qca->spi_msg2);
844 spi_message_add_tail(&qca->spi_xfer2[1], &qca->spi_msg2);
845
846 memset(&qca->txr, 0, sizeof(qca->txr));
847 qca->txr.count = TX_RING_MAX_LEN;
848 }
849
850 static const struct of_device_id qca_spi_of_match[] = {
851 { .compatible = "qca,qca7000" },
852 { /* sentinel */ }
853 };
854 MODULE_DEVICE_TABLE(of, qca_spi_of_match);
855
856 static int
857 qca_spi_probe(struct spi_device *spi)
858 {
859 struct qcaspi *qca = NULL;
860 struct net_device *qcaspi_devs = NULL;
861 u8 legacy_mode = 0;
862 u16 signature;
863 const char *mac;
864
865 if (!spi->dev.of_node) {
866 dev_err(&spi->dev, "Missing device tree\n");
867 return -EINVAL;
868 }
869
870 legacy_mode = of_property_read_bool(spi->dev.of_node,
871 "qca,legacy-mode");
872
873 if (qcaspi_clkspeed == 0) {
874 if (spi->max_speed_hz)
875 qcaspi_clkspeed = spi->max_speed_hz;
876 else
877 qcaspi_clkspeed = QCASPI_CLK_SPEED;
878 }
879
880 if ((qcaspi_clkspeed < QCASPI_CLK_SPEED_MIN) ||
881 (qcaspi_clkspeed > QCASPI_CLK_SPEED_MAX)) {
882 dev_info(&spi->dev, "Invalid clkspeed: %d\n",
883 qcaspi_clkspeed);
884 return -EINVAL;
885 }
886
887 if ((qcaspi_burst_len < QCASPI_BURST_LEN_MIN) ||
888 (qcaspi_burst_len > QCASPI_BURST_LEN_MAX)) {
889 dev_info(&spi->dev, "Invalid burst len: %d\n",
890 qcaspi_burst_len);
891 return -EINVAL;
892 }
893
894 if ((qcaspi_pluggable < QCASPI_PLUGGABLE_MIN) ||
895 (qcaspi_pluggable > QCASPI_PLUGGABLE_MAX)) {
896 dev_info(&spi->dev, "Invalid pluggable: %d\n",
897 qcaspi_pluggable);
898 return -EINVAL;
899 }
900
901 dev_info(&spi->dev, "ver=%s, clkspeed=%d, burst_len=%d, pluggable=%d\n",
902 QCASPI_DRV_VERSION,
903 qcaspi_clkspeed,
904 qcaspi_burst_len,
905 qcaspi_pluggable);
906
907 spi->mode = SPI_MODE_3;
908 spi->max_speed_hz = qcaspi_clkspeed;
909 if (spi_setup(spi) < 0) {
910 dev_err(&spi->dev, "Unable to setup SPI device\n");
911 return -EFAULT;
912 }
913
914 qcaspi_devs = alloc_etherdev(sizeof(struct qcaspi));
915 if (!qcaspi_devs)
916 return -ENOMEM;
917
918 qcaspi_netdev_setup(qcaspi_devs);
919 SET_NETDEV_DEV(qcaspi_devs, &spi->dev);
920
921 qca = netdev_priv(qcaspi_devs);
922 if (!qca) {
923 free_netdev(qcaspi_devs);
924 dev_err(&spi->dev, "Fail to retrieve private structure\n");
925 return -ENOMEM;
926 }
927 qca->net_dev = qcaspi_devs;
928 qca->spi_dev = spi;
929 qca->legacy_mode = legacy_mode;
930
931 spi_set_drvdata(spi, qcaspi_devs);
932
933 mac = of_get_mac_address(spi->dev.of_node);
934
935 if (mac)
936 ether_addr_copy(qca->net_dev->dev_addr, mac);
937
938 if (!is_valid_ether_addr(qca->net_dev->dev_addr)) {
939 eth_hw_addr_random(qca->net_dev);
940 dev_info(&spi->dev, "Using random MAC address: %pM\n",
941 qca->net_dev->dev_addr);
942 }
943
944 netif_carrier_off(qca->net_dev);
945
946 if (!qcaspi_pluggable) {
947 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
948 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
949
950 if (signature != QCASPI_GOOD_SIGNATURE) {
951 dev_err(&spi->dev, "Invalid signature (0x%04X)\n",
952 signature);
953 free_netdev(qcaspi_devs);
954 return -EFAULT;
955 }
956 }
957
958 if (register_netdev(qcaspi_devs)) {
959 dev_info(&spi->dev, "Unable to register net device %s\n",
960 qcaspi_devs->name);
961 free_netdev(qcaspi_devs);
962 return -EFAULT;
963 }
964
965 qcaspi_init_device_debugfs(qca);
966
967 return 0;
968 }
969
970 static int
971 qca_spi_remove(struct spi_device *spi)
972 {
973 struct net_device *qcaspi_devs = spi_get_drvdata(spi);
974 struct qcaspi *qca = netdev_priv(qcaspi_devs);
975
976 qcaspi_remove_device_debugfs(qca);
977
978 unregister_netdev(qcaspi_devs);
979 free_netdev(qcaspi_devs);
980
981 return 0;
982 }
983
984 static const struct spi_device_id qca_spi_id[] = {
985 { "qca7000", 0 },
986 { /* sentinel */ }
987 };
988 MODULE_DEVICE_TABLE(spi, qca_spi_id);
989
990 static struct spi_driver qca_spi_driver = {
991 .driver = {
992 .name = QCASPI_DRV_NAME,
993 .of_match_table = qca_spi_of_match,
994 },
995 .id_table = qca_spi_id,
996 .probe = qca_spi_probe,
997 .remove = qca_spi_remove,
998 };
999 module_spi_driver(qca_spi_driver);
1000
1001 MODULE_DESCRIPTION("Qualcomm Atheros QCA7000 SPI Driver");
1002 MODULE_AUTHOR("Qualcomm Atheros Communications");
1003 MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
1004 MODULE_LICENSE("Dual BSD/GPL");
1005 MODULE_VERSION(QCASPI_DRV_VERSION);
Linux with added FPC-III support