2 * Copyright (c) 2011, 2012, Qualcomm Atheros Communications Inc.
3 * Copyright (c) 2014, I2SE GmbH
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
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.
20 /* This module implements the Qualcomm Atheros SPI protocol for
21 * kernel-based SPI device; it is essentially an Ethernet-to-SPI
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>
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>
46 #include "qca_7k_common.h"
47 #include "qca_debug.h"
50 #define MAX_DMA_BURST_LEN 5000
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.");
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.");
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).");
72 #define QCASPI_TX_TIMEOUT (1 * HZ)
73 #define QCASPI_QCA7K_REBOOT_TIME_MS 1000
76 start_spi_intr_handling(struct qcaspi *qca, u16 *intr_cause)
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);
86 end_spi_intr_handling(struct qcaspi *qca, u16 intr_cause)
88 u16 intr_enable = (SPI_INT_CPU_ON |
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);
99 qcaspi_write_burst(struct qcaspi *qca, u8 *src, u32 len)
102 struct spi_message msg;
103 struct spi_transfer transfer[2];
106 memset(&transfer, 0, sizeof(transfer));
107 spi_message_init(&msg);
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;
115 spi_message_add_tail(&transfer[0], &msg);
116 spi_message_add_tail(&transfer[1], &msg);
117 ret = spi_sync(qca->spi_dev, &msg);
119 if (ret || (msg.actual_length != QCASPI_CMD_LEN + len)) {
120 qcaspi_spi_error(qca);
128 qcaspi_write_legacy(struct qcaspi *qca, u8 *src, u32 len)
130 struct spi_message msg;
131 struct spi_transfer transfer;
134 memset(&transfer, 0, sizeof(transfer));
135 spi_message_init(&msg);
137 transfer.tx_buf = src;
140 spi_message_add_tail(&transfer, &msg);
141 ret = spi_sync(qca->spi_dev, &msg);
143 if (ret || (msg.actual_length != len)) {
144 qcaspi_spi_error(qca);
152 qcaspi_read_burst(struct qcaspi *qca, u8 *dst, u32 len)
154 struct spi_message msg;
156 struct spi_transfer transfer[2];
159 memset(&transfer, 0, sizeof(transfer));
160 spi_message_init(&msg);
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;
168 spi_message_add_tail(&transfer[0], &msg);
169 spi_message_add_tail(&transfer[1], &msg);
170 ret = spi_sync(qca->spi_dev, &msg);
172 if (ret || (msg.actual_length != QCASPI_CMD_LEN + len)) {
173 qcaspi_spi_error(qca);
181 qcaspi_read_legacy(struct qcaspi *qca, u8 *dst, u32 len)
183 struct spi_message msg;
184 struct spi_transfer transfer;
187 memset(&transfer, 0, sizeof(transfer));
188 spi_message_init(&msg);
190 transfer.rx_buf = dst;
193 spi_message_add_tail(&transfer, &msg);
194 ret = spi_sync(qca->spi_dev, &msg);
196 if (ret || (msg.actual_length != len)) {
197 qcaspi_spi_error(qca);
205 qcaspi_tx_cmd(struct qcaspi *qca, u16 cmd)
208 struct spi_message msg;
209 struct spi_transfer transfer;
212 memset(&transfer, 0, sizeof(transfer));
214 spi_message_init(&msg);
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);
221 ret = spi_sync(qca->spi_dev, &msg);
227 qcaspi_spi_error(qca);
233 qcaspi_tx_frame(struct qcaspi *qca, struct sk_buff *skb)
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);
249 if (count > qca->burst_len)
250 count = qca->burst_len;
252 if (qca->legacy_mode) {
253 written = qcaspi_write_legacy(qca,
257 written = qcaspi_write_burst(qca,
262 if (written != count)
273 qcaspi_transmit(struct qcaspi *qca)
275 struct net_device_stats *n_stats = &qca->net_dev->stats;
281 if (qca->txr.skb[qca->txr.head] == NULL)
284 qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA, &available);
286 while (qca->txr.skb[qca->txr.head]) {
287 pkt_len = qca->txr.skb[qca->txr.head]->len + QCASPI_HW_PKT_LEN;
289 if (available < pkt_len) {
291 qca->stats.write_buf_miss++;
295 if (qcaspi_tx_frame(qca, qca->txr.skb[qca->txr.head]) == -1) {
296 qca->stats.write_err++;
301 n_stats->tx_packets++;
302 n_stats->tx_bytes += qca->txr.skb[qca->txr.head]->len;
303 available -= pkt_len;
305 /* remove the skb from the queue */
306 /* XXX After inconsistent lock states netif_tx_lock()
307 * has been replaced by netif_tx_lock_bh() and so on.
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)
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);
326 qcaspi_receive(struct qcaspi *qca)
328 struct net_device *net_dev = qca->net_dev;
329 struct net_device_stats *n_stats = &net_dev->stats;
334 /* Allocate rx SKB if we don't have one available. */
336 qca->rx_skb = netdev_alloc_skb_ip_align(net_dev,
340 netdev_dbg(net_dev, "out of RX resources\n");
341 qca->stats.out_of_mem++;
346 /* Read the packet size. */
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",
351 if (available == 0) {
352 netdev_dbg(net_dev, "qcaspi_receive called without any data being available!\n");
356 qcaspi_write_register(qca, SPI_REG_BFR_SIZE, available);
358 if (qca->legacy_mode)
359 qcaspi_tx_cmd(qca, QCA7K_SPI_READ | QCA7K_SPI_EXTERNAL);
362 u32 count = available;
364 if (count > qca->burst_len)
365 count = qca->burst_len;
367 if (qca->legacy_mode) {
368 bytes_read = qcaspi_read_legacy(qca, qca->rx_buffer,
371 bytes_read = qcaspi_read_burst(qca, qca->rx_buffer,
375 netdev_dbg(net_dev, "available: %d, byte read: %d\n",
376 available, bytes_read);
379 available -= bytes_read;
381 qca->stats.read_err++;
387 while ((bytes_read--) && (qca->rx_skb)) {
390 retcode = qcafrm_fsm_decode(&qca->frm_handle,
392 skb_tailroom(qca->rx_skb),
400 netdev_dbg(net_dev, "no RX tail\n");
401 n_stats->rx_errors++;
402 n_stats->rx_dropped++;
405 netdev_dbg(net_dev, "invalid RX length\n");
406 n_stats->rx_errors++;
407 n_stats->rx_dropped++;
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 skb_checksum_none_assert(qca->rx_skb);
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);
421 netdev_dbg(net_dev, "out of RX resources\n");
422 n_stats->rx_errors++;
423 qca->stats.out_of_mem++;
433 /* Check that tx ring stores only so much bytes
434 * that fit into the internal QCA buffer.
438 qcaspi_tx_ring_has_space(struct tx_ring *txr)
440 if (txr->skb[txr->tail])
443 return (txr->size + QCAFRM_MAX_LEN < QCASPI_HW_BUF_LEN) ? 1 : 0;
446 /* Flush the tx ring. This function is only safe to
447 * call from the qcaspi_spi_thread.
451 qcaspi_flush_tx_ring(struct qcaspi *qca)
455 /* XXX After inconsistent lock states netif_tx_lock()
456 * has been replaced by netif_tx_lock_bh() and so on.
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++;
469 netif_tx_unlock_bh(qca->net_dev);
473 qcaspi_qca7k_sync(struct qcaspi *qca, int event)
479 if (event == QCASPI_EVENT_CPUON) {
480 /* Read signature twice, if not valid
481 * go back to unknown state.
483 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
484 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
485 if (signature != QCASPI_GOOD_SIGNATURE) {
486 qca->sync = QCASPI_SYNC_UNKNOWN;
487 netdev_dbg(qca->net_dev, "sync: got CPU on, but signature was invalid, restart\n");
489 /* ensure that the WRBUF is empty */
490 qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA,
492 if (wrbuf_space != QCASPI_HW_BUF_LEN) {
493 netdev_dbg(qca->net_dev, "sync: got CPU on, but wrbuf not empty. reset!\n");
494 qca->sync = QCASPI_SYNC_UNKNOWN;
496 netdev_dbg(qca->net_dev, "sync: got CPU on, now in sync\n");
497 qca->sync = QCASPI_SYNC_READY;
504 case QCASPI_SYNC_READY:
505 /* Read signature, if not valid go to unknown state. */
506 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
507 if (signature != QCASPI_GOOD_SIGNATURE) {
508 qca->sync = QCASPI_SYNC_UNKNOWN;
509 netdev_dbg(qca->net_dev, "sync: bad signature, restart\n");
510 /* don't reset right away */
514 case QCASPI_SYNC_UNKNOWN:
515 /* Read signature, if not valid stay in unknown state */
516 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
517 if (signature != QCASPI_GOOD_SIGNATURE) {
518 netdev_dbg(qca->net_dev, "sync: could not read signature to reset device, retry.\n");
522 /* TODO: use GPIO to reset QCA7000 in legacy mode*/
523 netdev_dbg(qca->net_dev, "sync: resetting device.\n");
524 qcaspi_read_register(qca, SPI_REG_SPI_CONFIG, &spi_config);
525 spi_config |= QCASPI_SLAVE_RESET_BIT;
526 qcaspi_write_register(qca, SPI_REG_SPI_CONFIG, spi_config);
528 qca->sync = QCASPI_SYNC_RESET;
529 qca->stats.trig_reset++;
530 qca->reset_count = 0;
532 case QCASPI_SYNC_RESET:
534 netdev_dbg(qca->net_dev, "sync: waiting for CPU on, count %u.\n",
536 if (qca->reset_count >= QCASPI_RESET_TIMEOUT) {
537 /* reset did not seem to take place, try again */
538 qca->sync = QCASPI_SYNC_UNKNOWN;
539 qca->stats.reset_timeout++;
540 netdev_dbg(qca->net_dev, "sync: reset timeout, restarting process.\n");
547 qcaspi_spi_thread(void *data)
549 struct qcaspi *qca = data;
552 netdev_info(qca->net_dev, "SPI thread created\n");
553 while (!kthread_should_stop()) {
554 set_current_state(TASK_INTERRUPTIBLE);
555 if ((qca->intr_req == qca->intr_svc) &&
556 (qca->txr.skb[qca->txr.head] == NULL) &&
557 (qca->sync == QCASPI_SYNC_READY))
560 set_current_state(TASK_RUNNING);
562 netdev_dbg(qca->net_dev, "have work to do. int: %d, tx_skb: %p\n",
563 qca->intr_req - qca->intr_svc,
564 qca->txr.skb[qca->txr.head]);
566 qcaspi_qca7k_sync(qca, QCASPI_EVENT_UPDATE);
568 if (qca->sync != QCASPI_SYNC_READY) {
569 netdev_dbg(qca->net_dev, "sync: not ready %u, turn off carrier and flush\n",
570 (unsigned int)qca->sync);
571 netif_stop_queue(qca->net_dev);
572 netif_carrier_off(qca->net_dev);
573 qcaspi_flush_tx_ring(qca);
574 msleep(QCASPI_QCA7K_REBOOT_TIME_MS);
577 if (qca->intr_svc != qca->intr_req) {
578 qca->intr_svc = qca->intr_req;
579 start_spi_intr_handling(qca, &intr_cause);
581 if (intr_cause & SPI_INT_CPU_ON) {
582 qcaspi_qca7k_sync(qca, QCASPI_EVENT_CPUON);
585 if (qca->sync != QCASPI_SYNC_READY)
588 qca->stats.device_reset++;
589 netif_wake_queue(qca->net_dev);
590 netif_carrier_on(qca->net_dev);
593 if (intr_cause & SPI_INT_RDBUF_ERR) {
595 netdev_dbg(qca->net_dev, "===> rdbuf error!\n");
596 qca->stats.read_buf_err++;
597 qca->sync = QCASPI_SYNC_UNKNOWN;
601 if (intr_cause & SPI_INT_WRBUF_ERR) {
603 netdev_dbg(qca->net_dev, "===> wrbuf error!\n");
604 qca->stats.write_buf_err++;
605 qca->sync = QCASPI_SYNC_UNKNOWN;
609 /* can only handle other interrupts
610 * if sync has occurred
612 if (qca->sync == QCASPI_SYNC_READY) {
613 if (intr_cause & SPI_INT_PKT_AVLBL)
617 end_spi_intr_handling(qca, intr_cause);
620 if (qca->sync == QCASPI_SYNC_READY)
621 qcaspi_transmit(qca);
623 set_current_state(TASK_RUNNING);
624 netdev_info(qca->net_dev, "SPI thread exit\n");
630 qcaspi_intr_handler(int irq, void *data)
632 struct qcaspi *qca = data;
635 if (qca->spi_thread &&
636 qca->spi_thread->state != TASK_RUNNING)
637 wake_up_process(qca->spi_thread);
643 qcaspi_netdev_open(struct net_device *dev)
645 struct qcaspi *qca = netdev_priv(dev);
653 qca->sync = QCASPI_SYNC_UNKNOWN;
654 qcafrm_fsm_init_spi(&qca->frm_handle);
656 qca->spi_thread = kthread_run((void *)qcaspi_spi_thread,
657 qca, "%s", dev->name);
659 if (IS_ERR(qca->spi_thread)) {
660 netdev_err(dev, "%s: unable to start kernel thread.\n",
662 return PTR_ERR(qca->spi_thread);
665 ret = request_irq(qca->spi_dev->irq, qcaspi_intr_handler, 0,
668 netdev_err(dev, "%s: unable to get IRQ %d (irqval=%d).\n",
669 QCASPI_DRV_NAME, qca->spi_dev->irq, ret);
670 kthread_stop(qca->spi_thread);
674 /* SPI thread takes care of TX queue */
680 qcaspi_netdev_close(struct net_device *dev)
682 struct qcaspi *qca = netdev_priv(dev);
684 netif_stop_queue(dev);
686 qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, 0);
687 free_irq(qca->spi_dev->irq, qca);
689 kthread_stop(qca->spi_thread);
690 qca->spi_thread = NULL;
691 qcaspi_flush_tx_ring(qca);
697 qcaspi_netdev_xmit(struct sk_buff *skb, struct net_device *dev)
701 struct qcaspi *qca = netdev_priv(dev);
703 struct sk_buff *tskb;
706 if (skb->len < QCAFRM_MIN_LEN)
707 pad_len = QCAFRM_MIN_LEN - skb->len;
709 if (qca->txr.skb[qca->txr.tail]) {
710 netdev_warn(qca->net_dev, "queue was unexpectedly full!\n");
711 netif_stop_queue(qca->net_dev);
712 qca->stats.ring_full++;
713 return NETDEV_TX_BUSY;
716 if ((skb_headroom(skb) < QCAFRM_HEADER_LEN) ||
717 (skb_tailroom(skb) < QCAFRM_FOOTER_LEN + pad_len)) {
718 tskb = skb_copy_expand(skb, QCAFRM_HEADER_LEN,
719 QCAFRM_FOOTER_LEN + pad_len, GFP_ATOMIC);
721 netdev_dbg(qca->net_dev, "could not allocate tx_buff\n");
722 qca->stats.out_of_mem++;
723 return NETDEV_TX_BUSY;
729 frame_len = skb->len + pad_len;
731 ptmp = skb_push(skb, QCAFRM_HEADER_LEN);
732 qcafrm_create_header(ptmp, frame_len);
735 ptmp = skb_put_zero(skb, pad_len);
738 ptmp = skb_put(skb, QCAFRM_FOOTER_LEN);
739 qcafrm_create_footer(ptmp);
741 netdev_dbg(qca->net_dev, "Tx-ing packet: Size: 0x%08x\n",
744 qca->txr.size += skb->len + QCASPI_HW_PKT_LEN;
746 new_tail = qca->txr.tail + 1;
747 if (new_tail >= qca->txr.count)
750 qca->txr.skb[qca->txr.tail] = skb;
751 qca->txr.tail = new_tail;
753 if (!qcaspi_tx_ring_has_space(&qca->txr)) {
754 netif_stop_queue(qca->net_dev);
755 qca->stats.ring_full++;
758 netif_trans_update(dev);
760 if (qca->spi_thread &&
761 qca->spi_thread->state != TASK_RUNNING)
762 wake_up_process(qca->spi_thread);
768 qcaspi_netdev_tx_timeout(struct net_device *dev)
770 struct qcaspi *qca = netdev_priv(dev);
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 /* Trigger tx queue flush and QCA7000 reset */
776 qca->sync = QCASPI_SYNC_UNKNOWN;
779 wake_up_process(qca->spi_thread);
783 qcaspi_netdev_init(struct net_device *dev)
785 struct qcaspi *qca = netdev_priv(dev);
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;
795 memset(&qca->stats, 0, sizeof(struct qcaspi_stats));
797 qca->rx_buffer = kmalloc(qca->buffer_size, GFP_KERNEL);
801 qca->rx_skb = netdev_alloc_skb_ip_align(dev, qca->net_dev->mtu +
804 kfree(qca->rx_buffer);
805 netdev_info(qca->net_dev, "Failed to allocate RX sk_buff.\n");
813 qcaspi_netdev_uninit(struct net_device *dev)
815 struct qcaspi *qca = netdev_priv(dev);
817 kfree(qca->rx_buffer);
818 qca->buffer_size = 0;
820 dev_kfree_skb(qca->rx_skb);
823 static 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,
835 qcaspi_netdev_setup(struct net_device *dev)
837 struct qcaspi *qca = NULL;
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;
845 /* MTU range: 46 - 1500 */
846 dev->min_mtu = QCAFRM_MIN_MTU;
847 dev->max_mtu = QCAFRM_MAX_MTU;
849 qca = netdev_priv(dev);
850 memset(qca, 0, sizeof(struct qcaspi));
852 memset(&qca->txr, 0, sizeof(qca->txr));
853 qca->txr.count = TX_RING_MAX_LEN;
856 static const struct of_device_id qca_spi_of_match[] = {
857 { .compatible = "qca,qca7000" },
860 MODULE_DEVICE_TABLE(of, qca_spi_of_match);
863 qca_spi_probe(struct spi_device *spi)
865 struct qcaspi *qca = NULL;
866 struct net_device *qcaspi_devs = NULL;
871 if (!spi->dev.of_node) {
872 dev_err(&spi->dev, "Missing device tree\n");
876 legacy_mode = of_property_read_bool(spi->dev.of_node,
879 if (qcaspi_clkspeed == 0) {
880 if (spi->max_speed_hz)
881 qcaspi_clkspeed = spi->max_speed_hz;
883 qcaspi_clkspeed = QCASPI_CLK_SPEED;
886 if ((qcaspi_clkspeed < QCASPI_CLK_SPEED_MIN) ||
887 (qcaspi_clkspeed > QCASPI_CLK_SPEED_MAX)) {
888 dev_err(&spi->dev, "Invalid clkspeed: %d\n",
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",
900 if ((qcaspi_pluggable < QCASPI_PLUGGABLE_MIN) ||
901 (qcaspi_pluggable > QCASPI_PLUGGABLE_MAX)) {
902 dev_err(&spi->dev, "Invalid pluggable: %d\n",
907 dev_info(&spi->dev, "ver=%s, clkspeed=%d, burst_len=%d, pluggable=%d\n",
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");
920 qcaspi_devs = alloc_etherdev(sizeof(struct qcaspi));
924 qcaspi_netdev_setup(qcaspi_devs);
925 SET_NETDEV_DEV(qcaspi_devs, &spi->dev);
927 qca = netdev_priv(qcaspi_devs);
929 free_netdev(qcaspi_devs);
930 dev_err(&spi->dev, "Fail to retrieve private structure\n");
933 qca->net_dev = qcaspi_devs;
935 qca->legacy_mode = legacy_mode;
937 spi_set_drvdata(spi, qcaspi_devs);
939 mac = of_get_mac_address(spi->dev.of_node);
942 ether_addr_copy(qca->net_dev->dev_addr, mac);
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);
950 netif_carrier_off(qca->net_dev);
952 if (!qcaspi_pluggable) {
953 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
954 qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature);
956 if (signature != QCASPI_GOOD_SIGNATURE) {
957 dev_err(&spi->dev, "Invalid signature (0x%04X)\n",
959 free_netdev(qcaspi_devs);
964 if (register_netdev(qcaspi_devs)) {
965 dev_err(&spi->dev, "Unable to register net device %s\n",
967 free_netdev(qcaspi_devs);
971 qcaspi_init_device_debugfs(qca);
977 qca_spi_remove(struct spi_device *spi)
979 struct net_device *qcaspi_devs = spi_get_drvdata(spi);
980 struct qcaspi *qca = netdev_priv(qcaspi_devs);
982 qcaspi_remove_device_debugfs(qca);
984 unregister_netdev(qcaspi_devs);
985 free_netdev(qcaspi_devs);
990 static const struct spi_device_id qca_spi_id[] = {
994 MODULE_DEVICE_TABLE(spi, qca_spi_id);
996 static struct spi_driver qca_spi_driver = {
998 .name = QCASPI_DRV_NAME,
999 .of_match_table = qca_spi_of_match,
1001 .id_table = qca_spi_id,
1002 .probe = qca_spi_probe,
1003 .remove = qca_spi_remove,
1005 module_spi_driver(qca_spi_driver);
1007 MODULE_DESCRIPTION("Qualcomm Atheros QCA7000 SPI Driver");
1008 MODULE_AUTHOR("Qualcomm Atheros Communications");
1009 MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
1010 MODULE_LICENSE("Dual BSD/GPL");
1011 MODULE_VERSION(QCASPI_DRV_VERSION);