1 // SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
8  *   kernel-based SPI device; it is essentially an Ethernet-to-SPI
47 MODULE_PARM_DESC(qcaspi_clkspeed, "SPI bus clock speed (Hz). Use 1000000-16000000.");
53 MODULE_PARM_DESC(qcaspi_burst_len, "Number of data bytes per burst. Use 1-5000.");
65 MODULE_PARM_DESC(wr_verify, "SPI register write verify trails. Use 0-3.");
77 	netdev_dbg(qca->net_dev, "interrupts: 0x%04x\n", *intr_cause);  in start_spi_intr_handling()
90 	netdev_dbg(qca->net_dev, "acking int: 0x%04x\n", intr_cause);  in end_spi_intr_handling()
98 	struct spi_transfer transfer[2];  in qcaspi_write_burst()  local
101 	memset(&transfer, 0, sizeof(transfer));  in qcaspi_write_burst()
105 	transfer[0].tx_buf = &cmd;  in qcaspi_write_burst()
106 	transfer[0].len = QCASPI_CMD_LEN;  in qcaspi_write_burst()
107 	transfer[1].tx_buf = src;  in qcaspi_write_burst()
108 	transfer[1].len = len;  in qcaspi_write_burst()
110 	spi_message_add_tail(&transfer[0], &msg);  in qcaspi_write_burst()
111 	spi_message_add_tail(&transfer[1], &msg);  in qcaspi_write_burst()
112 	ret = spi_sync(qca->spi_dev, &msg);  in qcaspi_write_burst()
126 	struct spi_transfer transfer;  in qcaspi_write_legacy()  local
129 	memset(&transfer, 0, sizeof(transfer));  in qcaspi_write_legacy()
132 	transfer.tx_buf = src;  in qcaspi_write_legacy()
133 	transfer.len = len;  in qcaspi_write_legacy()
135 	spi_message_add_tail(&transfer, &msg);  in qcaspi_write_legacy()
136 	ret = spi_sync(qca->spi_dev, &msg);  in qcaspi_write_legacy()
151 	struct spi_transfer transfer[2];  in qcaspi_read_burst()  local
154 	memset(&transfer, 0, sizeof(transfer));  in qcaspi_read_burst()
158 	transfer[0].tx_buf = &cmd;  in qcaspi_read_burst()
159 	transfer[0].len = QCASPI_CMD_LEN;  in qcaspi_read_burst()
160 	transfer[1].rx_buf = dst;  in qcaspi_read_burst()
161 	transfer[1].len = len;  in qcaspi_read_burst()
163 	spi_message_add_tail(&transfer[0], &msg);  in qcaspi_read_burst()
164 	spi_message_add_tail(&transfer[1], &msg);  in qcaspi_read_burst()
165 	ret = spi_sync(qca->spi_dev, &msg);  in qcaspi_read_burst()
179 	struct spi_transfer transfer;  in qcaspi_read_legacy()  local
182 	memset(&transfer, 0, sizeof(transfer));  in qcaspi_read_legacy()
185 	transfer.rx_buf = dst;  in qcaspi_read_legacy()
186 	transfer.len = len;  in qcaspi_read_legacy()
188 	spi_message_add_tail(&transfer, &msg);  in qcaspi_read_legacy()
189 	ret = spi_sync(qca->spi_dev, &msg);  in qcaspi_read_legacy()
204 	struct spi_transfer transfer;  in qcaspi_tx_cmd()  local
207 	memset(&transfer, 0, sizeof(transfer));  in qcaspi_tx_cmd()
212 	transfer.len = sizeof(cmd);  in qcaspi_tx_cmd()
213 	transfer.tx_buf = &tx_data;  in qcaspi_tx_cmd()
214 	spi_message_add_tail(&transfer, &msg);  in qcaspi_tx_cmd()
216 	ret = spi_sync(qca->spi_dev, &msg);  in qcaspi_tx_cmd()
235 	len = skb->len;  in qcaspi_tx_frame()
238 	if (qca->legacy_mode)  in qcaspi_tx_frame()
244 		if (count > qca->burst_len)  in qcaspi_tx_frame()
245 			count = qca->burst_len;  in qcaspi_tx_frame()
247 		if (qca->legacy_mode) {  in qcaspi_tx_frame()
249 						      skb->data + offset,  in qcaspi_tx_frame()
253 						     skb->data + offset,  in qcaspi_tx_frame()
258 			return -1;  in qcaspi_tx_frame()
261 		len -= count;  in qcaspi_tx_frame()
270 	struct net_device_stats *n_stats = &qca->net_dev->stats;  in qcaspi_transmit()
276 	if (qca->txr.skb[qca->txr.head] == NULL)  in qcaspi_transmit()
285 		qca->stats.buf_avail_err++;  in qcaspi_transmit()
286 		return -1;  in qcaspi_transmit()
289 	while (qca->txr.skb[qca->txr.head]) {  in qcaspi_transmit()
290 		pkt_len = qca->txr.skb[qca->txr.head]->len + QCASPI_HW_PKT_LEN;  in qcaspi_transmit()
294 				qca->stats.write_buf_miss++;  in qcaspi_transmit()
298 		if (qcaspi_tx_frame(qca, qca->txr.skb[qca->txr.head]) == -1) {  in qcaspi_transmit()
299 			qca->stats.write_err++;  in qcaspi_transmit()
300 			return -1;  in qcaspi_transmit()
304 		n_stats->tx_packets++;  in qcaspi_transmit()
305 		n_stats->tx_bytes += qca->txr.skb[qca->txr.head]->len;  in qcaspi_transmit()
306 		available -= pkt_len;  in qcaspi_transmit()
312 		netif_tx_lock_bh(qca->net_dev);  in qcaspi_transmit()
313 		dev_kfree_skb(qca->txr.skb[qca->txr.head]);  in qcaspi_transmit()
314 		qca->txr.skb[qca->txr.head] = NULL;  in qcaspi_transmit()
315 		qca->txr.size -= pkt_len;  in qcaspi_transmit()
316 		new_head = qca->txr.head + 1;  in qcaspi_transmit()
317 		if (new_head >= qca->txr.count)  in qcaspi_transmit()
319 		qca->txr.head = new_head;  in qcaspi_transmit()
320 		if (netif_queue_stopped(qca->net_dev))  in qcaspi_transmit()
321 			netif_wake_queue(qca->net_dev);  in qcaspi_transmit()
322 		netif_tx_unlock_bh(qca->net_dev);  in qcaspi_transmit()
331 	struct net_device *net_dev = qca->net_dev;  in qcaspi_receive()
332 	struct net_device_stats *n_stats = &net_dev->stats;  in qcaspi_receive()
338 	if (!qca->rx_skb) {  in qcaspi_receive()
339 		qca->rx_skb = netdev_alloc_skb_ip_align(net_dev,  in qcaspi_receive()
340 							net_dev->mtu +  in qcaspi_receive()
342 		if (!qca->rx_skb) {  in qcaspi_receive()
344 			qca->stats.out_of_mem++;  in qcaspi_receive()
345 			return -1;  in qcaspi_receive()
359 		qca->stats.buf_avail_err++;  in qcaspi_receive()
360 		return -1;  in qcaspi_receive()
362 		netdev_dbg(net_dev, "qcaspi_receive called without any data being available!\n");  in qcaspi_receive()
363 		return -1;  in qcaspi_receive()
368 	if (qca->legacy_mode)  in qcaspi_receive()
374 		if (count > qca->burst_len)  in qcaspi_receive()
375 			count = qca->burst_len;  in qcaspi_receive()
377 		if (qca->legacy_mode) {  in qcaspi_receive()
378 			bytes_read = qcaspi_read_legacy(qca, qca->rx_buffer,  in qcaspi_receive()
381 			bytes_read = qcaspi_read_burst(qca, qca->rx_buffer,  in qcaspi_receive()
389 			available -= bytes_read;  in qcaspi_receive()
391 			qca->stats.read_err++;  in qcaspi_receive()
392 			return -1;  in qcaspi_receive()
395 		cp = qca->rx_buffer;  in qcaspi_receive()
397 		while ((bytes_read--) && (qca->rx_skb)) {  in qcaspi_receive()
400 			retcode = qcafrm_fsm_decode(&qca->frm_handle,  in qcaspi_receive()
401 						    qca->rx_skb->data,  in qcaspi_receive()
402 						    skb_tailroom(qca->rx_skb),  in qcaspi_receive()
411 				n_stats->rx_errors++;  in qcaspi_receive()
412 				n_stats->rx_dropped++;  in qcaspi_receive()
416 				n_stats->rx_errors++;  in qcaspi_receive()
417 				n_stats->rx_dropped++;  in qcaspi_receive()
420 				qca->rx_skb->dev = qca->net_dev;  in qcaspi_receive()
421 				n_stats->rx_packets++;  in qcaspi_receive()
422 				n_stats->rx_bytes += retcode;  in qcaspi_receive()
423 				skb_put(qca->rx_skb, retcode);  in qcaspi_receive()
424 				qca->rx_skb->protocol = eth_type_trans(  in qcaspi_receive()
425 					qca->rx_skb, qca->rx_skb->dev);  in qcaspi_receive()
426 				skb_checksum_none_assert(qca->rx_skb);  in qcaspi_receive()
427 				netif_rx(qca->rx_skb);  in qcaspi_receive()
428 				qca->rx_skb = netdev_alloc_skb_ip_align(net_dev,  in qcaspi_receive()
429 					net_dev->mtu + VLAN_ETH_HLEN);  in qcaspi_receive()
430 				if (!qca->rx_skb) {  in qcaspi_receive()
432 					n_stats->rx_errors++;  in qcaspi_receive()
433 					qca->stats.out_of_mem++;  in qcaspi_receive()
450 	if (txr->skb[txr->tail])  in qcaspi_tx_ring_has_space()
453 	return (txr->size + QCAFRM_MAX_LEN < QCASPI_HW_BUF_LEN) ? 1 : 0;  in qcaspi_tx_ring_has_space()
468 	netif_tx_lock_bh(qca->net_dev);  in qcaspi_flush_tx_ring()
470 		if (qca->txr.skb[i]) {  in qcaspi_flush_tx_ring()
471 			dev_kfree_skb(qca->txr.skb[i]);  in qcaspi_flush_tx_ring()
472 			qca->txr.skb[i] = NULL;  in qcaspi_flush_tx_ring()
473 			qca->net_dev->stats.tx_dropped++;  in qcaspi_flush_tx_ring()
476 	qca->txr.tail = 0;  in qcaspi_flush_tx_ring()
477 	qca->txr.head = 0;  in qcaspi_flush_tx_ring()
478 	qca->txr.size = 0;  in qcaspi_flush_tx_ring()
479 	netif_tx_unlock_bh(qca->net_dev);  in qcaspi_flush_tx_ring()
496 			if (qca->sync == QCASPI_SYNC_READY)  in qcaspi_qca7k_sync()
497 				qca->stats.bad_signature++;  in qcaspi_qca7k_sync()
499 			set_bit(SPI_RESET, &qca->flags);  in qcaspi_qca7k_sync()
500 			netdev_dbg(qca->net_dev, "sync: got CPU on, but signature was invalid, restart\n");  in qcaspi_qca7k_sync()
507 				netdev_dbg(qca->net_dev, "sync: got CPU on, but wrbuf not empty. reset!\n");  in qcaspi_qca7k_sync()
508 				qca->sync = QCASPI_SYNC_UNKNOWN;  in qcaspi_qca7k_sync()
509 				qca->stats.buf_avail_err++;  in qcaspi_qca7k_sync()
511 				netdev_dbg(qca->net_dev, "sync: got CPU on, now in sync\n");  in qcaspi_qca7k_sync()
512 				qca->sync = QCASPI_SYNC_READY;  in qcaspi_qca7k_sync()
518 		if (test_and_clear_bit(SPI_RESET, &qca->flags))  in qcaspi_qca7k_sync()
519 			qca->sync = QCASPI_SYNC_UNKNOWN;  in qcaspi_qca7k_sync()
522 	switch (qca->sync) {  in qcaspi_qca7k_sync()
530 			set_bit(SPI_RESET, &qca->flags);  in qcaspi_qca7k_sync()
531 			qca->stats.bad_signature++;  in qcaspi_qca7k_sync()
532 			netdev_dbg(qca->net_dev, "sync: bad signature, restart\n");  in qcaspi_qca7k_sync()
541 			netdev_dbg(qca->net_dev, "sync: could not read signature to reset device, retry.\n");  in qcaspi_qca7k_sync()
546 		netdev_dbg(qca->net_dev, "sync: resetting device.\n");  in qcaspi_qca7k_sync()
551 		qca->sync = QCASPI_SYNC_RESET;  in qcaspi_qca7k_sync()
552 		qca->stats.trig_reset++;  in qcaspi_qca7k_sync()
553 		qca->reset_count = 0;  in qcaspi_qca7k_sync()
556 		qca->reset_count++;  in qcaspi_qca7k_sync()
557 		netdev_dbg(qca->net_dev, "sync: waiting for CPU on, count %u.\n",  in qcaspi_qca7k_sync()
558 			   qca->reset_count);  in qcaspi_qca7k_sync()
559 		if (qca->reset_count >= QCASPI_RESET_TIMEOUT) {  in qcaspi_qca7k_sync()
561 			set_bit(SPI_RESET, &qca->flags);  in qcaspi_qca7k_sync()
562 			qca->stats.reset_timeout++;  in qcaspi_qca7k_sync()
563 			netdev_dbg(qca->net_dev, "sync: reset timeout, restarting process.\n");  in qcaspi_qca7k_sync()
570 qcaspi_spi_thread(void *data)  in qcaspi_spi_thread()  argument
572 	struct qcaspi *qca = data;  in qcaspi_spi_thread()
575 	netdev_info(qca->net_dev, "SPI thread created\n");  in qcaspi_spi_thread()
579 			netif_tx_disable(qca->net_dev);  in qcaspi_spi_thread()
580 			netif_carrier_off(qca->net_dev);  in qcaspi_spi_thread()
583 			if (qca->sync == QCASPI_SYNC_READY) {  in qcaspi_spi_thread()
584 				netif_carrier_on(qca->net_dev);  in qcaspi_spi_thread()
585 				netif_wake_queue(qca->net_dev);  in qcaspi_spi_thread()
590 		if (!qca->flags &&  in qcaspi_spi_thread()
591 		    !qca->txr.skb[qca->txr.head])  in qcaspi_spi_thread()
596 		netdev_dbg(qca->net_dev, "have work to do. int: %lu, tx_skb: %p\n",  in qcaspi_spi_thread()
597 			   qca->flags,  in qcaspi_spi_thread()
598 			   qca->txr.skb[qca->txr.head]);  in qcaspi_spi_thread()
602 		if (qca->sync != QCASPI_SYNC_READY) {  in qcaspi_spi_thread()
603 			netdev_dbg(qca->net_dev, "sync: not ready %u, turn off carrier and flush\n",  in qcaspi_spi_thread()
604 				   (unsigned int)qca->sync);  in qcaspi_spi_thread()
605 			netif_stop_queue(qca->net_dev);  in qcaspi_spi_thread()
606 			netif_carrier_off(qca->net_dev);  in qcaspi_spi_thread()
611 		if (test_and_clear_bit(SPI_INTR, &qca->flags)) {  in qcaspi_spi_thread()
618 				if (qca->frm_handle.state != qca->frm_handle.init)  in qcaspi_spi_thread()
619 					qca->net_dev->stats.rx_dropped++;  in qcaspi_spi_thread()
621 				qcafrm_fsm_init_spi(&qca->frm_handle);  in qcaspi_spi_thread()
622 				qca->stats.device_reset++;  in qcaspi_spi_thread()
625 				if (qca->sync != QCASPI_SYNC_READY)  in qcaspi_spi_thread()
628 				netif_wake_queue(qca->net_dev);  in qcaspi_spi_thread()
629 				netif_carrier_on(qca->net_dev);  in qcaspi_spi_thread()
634 				netdev_dbg(qca->net_dev, "===> rdbuf error!\n");  in qcaspi_spi_thread()
635 				qca->stats.read_buf_err++;  in qcaspi_spi_thread()
636 				set_bit(SPI_RESET, &qca->flags);  in qcaspi_spi_thread()
642 				netdev_dbg(qca->net_dev, "===> wrbuf error!\n");  in qcaspi_spi_thread()
643 				qca->stats.write_buf_err++;  in qcaspi_spi_thread()
644 				set_bit(SPI_RESET, &qca->flags);  in qcaspi_spi_thread()
651 			if (qca->sync == QCASPI_SYNC_READY) {  in qcaspi_spi_thread()
659 		if (qca->sync == QCASPI_SYNC_READY)  in qcaspi_spi_thread()
663 	netdev_info(qca->net_dev, "SPI thread exit\n");  in qcaspi_spi_thread()
669 qcaspi_intr_handler(int irq, void *data)  in qcaspi_intr_handler()  argument
671 	struct qcaspi *qca = data;  in qcaspi_intr_handler()
673 	set_bit(SPI_INTR, &qca->flags);  in qcaspi_intr_handler()
674 	if (qca->spi_thread)  in qcaspi_intr_handler()
675 		wake_up_process(qca->spi_thread);  in qcaspi_intr_handler()
687 		return -EINVAL;  in qcaspi_netdev_open()
689 	set_bit(SPI_INTR, &qca->flags);  in qcaspi_netdev_open()
690 	qca->sync = QCASPI_SYNC_UNKNOWN;  in qcaspi_netdev_open()
691 	qcafrm_fsm_init_spi(&qca->frm_handle);  in qcaspi_netdev_open()
694 			     qca, "%s", dev->name);  in qcaspi_netdev_open()
702 	qca->spi_thread = thread;  in qcaspi_netdev_open()
704 	enable_irq(qca->spi_dev->irq);  in qcaspi_netdev_open()
719 	disable_irq(qca->spi_dev->irq);  in qcaspi_netdev_close()
721 	if (qca->spi_thread) {  in qcaspi_netdev_close()
722 		kthread_stop(qca->spi_thread);  in qcaspi_netdev_close()
723 		qca->spi_thread = NULL;  in qcaspi_netdev_close()
740 	if (skb->len < QCAFRM_MIN_LEN)  in qcaspi_netdev_xmit()
741 		pad_len = QCAFRM_MIN_LEN - skb->len;  in qcaspi_netdev_xmit()
743 	if (qca->txr.skb[qca->txr.tail]) {  in qcaspi_netdev_xmit()
744 		netdev_warn(qca->net_dev, "queue was unexpectedly full!\n");  in qcaspi_netdev_xmit()
745 		netif_stop_queue(qca->net_dev);  in qcaspi_netdev_xmit()
746 		qca->stats.ring_full++;  in qcaspi_netdev_xmit()
755 			qca->stats.out_of_mem++;  in qcaspi_netdev_xmit()
762 	frame_len = skb->len + pad_len;  in qcaspi_netdev_xmit()
774 	netdev_dbg(qca->net_dev, "Tx-ing packet: Size: 0x%08x\n",  in qcaspi_netdev_xmit()
775 		   skb->len);  in qcaspi_netdev_xmit()
777 	qca->txr.size += skb->len + QCASPI_HW_PKT_LEN;  in qcaspi_netdev_xmit()
779 	new_tail = qca->txr.tail + 1;  in qcaspi_netdev_xmit()
780 	if (new_tail >= qca->txr.count)  in qcaspi_netdev_xmit()
783 	qca->txr.skb[qca->txr.tail] = skb;  in qcaspi_netdev_xmit()
784 	qca->txr.tail = new_tail;  in qcaspi_netdev_xmit()
786 	if (!qcaspi_tx_ring_has_space(&qca->txr)) {  in qcaspi_netdev_xmit()
787 		netif_stop_queue(qca->net_dev);  in qcaspi_netdev_xmit()
788 		qca->stats.ring_full++;  in qcaspi_netdev_xmit()
793 	if (qca->spi_thread)  in qcaspi_netdev_xmit()
794 		wake_up_process(qca->spi_thread);  in qcaspi_netdev_xmit()
804 	netdev_info(qca->net_dev, "Transmit timeout at %ld, latency %ld\n",  in qcaspi_netdev_tx_timeout()
805 		    jiffies, jiffies - dev_trans_start(dev));  in qcaspi_netdev_tx_timeout()
806 	qca->net_dev->stats.tx_errors++;  in qcaspi_netdev_tx_timeout()
808 	set_bit(SPI_RESET, &qca->flags);  in qcaspi_netdev_tx_timeout()
810 	if (qca->spi_thread)  in qcaspi_netdev_tx_timeout()
811 		wake_up_process(qca->spi_thread);  in qcaspi_netdev_tx_timeout()
819 	dev->mtu = QCAFRM_MAX_MTU;  in qcaspi_netdev_init()
820 	dev->type = ARPHRD_ETHER;  in qcaspi_netdev_init()
821 	qca->burst_len = qcaspi_burst_len;  in qcaspi_netdev_init()
822 	qca->spi_thread = NULL;  in qcaspi_netdev_init()
823 	qca->buffer_size = (QCAFRM_MAX_MTU + VLAN_ETH_HLEN + QCAFRM_HEADER_LEN +  in qcaspi_netdev_init()
826 	memset(&qca->stats, 0, sizeof(struct qcaspi_stats));  in qcaspi_netdev_init()
828 	qca->rx_buffer = kmalloc(qca->buffer_size, GFP_KERNEL);  in qcaspi_netdev_init()
829 	if (!qca->rx_buffer)  in qcaspi_netdev_init()
830 		return -ENOBUFS;  in qcaspi_netdev_init()
832 	qca->rx_skb = netdev_alloc_skb_ip_align(dev, qca->net_dev->mtu +  in qcaspi_netdev_init()
834 	if (!qca->rx_skb) {  in qcaspi_netdev_init()
835 		kfree(qca->rx_buffer);  in qcaspi_netdev_init()
836 		netdev_info(qca->net_dev, "Failed to allocate RX sk_buff.\n");  in qcaspi_netdev_init()
837 		return -ENOBUFS;  in qcaspi_netdev_init()
848 	kfree(qca->rx_buffer);  in qcaspi_netdev_uninit()
849 	qca->buffer_size = 0;  in qcaspi_netdev_uninit()
850 	dev_kfree_skb(qca->rx_skb);  in qcaspi_netdev_uninit()
869 	dev->netdev_ops = &qcaspi_netdev_ops;  in qcaspi_netdev_setup()
871 	dev->watchdog_timeo = QCASPI_TX_TIMEOUT;  in qcaspi_netdev_setup()
872 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;  in qcaspi_netdev_setup()
873 	dev->needed_tailroom = ALIGN(QCAFRM_FOOTER_LEN + QCAFRM_MIN_LEN, 4);  in qcaspi_netdev_setup()
874 	dev->needed_headroom = ALIGN(QCAFRM_HEADER_LEN, 4);  in qcaspi_netdev_setup()
875 	dev->tx_queue_len = 100;  in qcaspi_netdev_setup()
877 	/* MTU range: 46 - 1500 */  in qcaspi_netdev_setup()
878 	dev->min_mtu = QCAFRM_MIN_MTU;  in qcaspi_netdev_setup()
879 	dev->max_mtu = QCAFRM_MAX_MTU;  in qcaspi_netdev_setup()
884 	memset(&qca->txr, 0, sizeof(qca->txr));  in qcaspi_netdev_setup()
885 	qca->txr.count = QCASPI_TX_RING_MAX_LEN;  in qcaspi_netdev_setup()
903 	if (!spi->dev.of_node) {  in qca_spi_probe()
904 		dev_err(&spi->dev, "Missing device tree\n");  in qca_spi_probe()
905 		return -EINVAL;  in qca_spi_probe()
908 	legacy_mode = of_property_read_bool(spi->dev.of_node,  in qca_spi_probe()
909 					    "qca,legacy-mode");  in qca_spi_probe()
912 		spi->max_speed_hz = qcaspi_clkspeed;  in qca_spi_probe()
913 	else if (!spi->max_speed_hz)  in qca_spi_probe()
914 		spi->max_speed_hz = QCASPI_CLK_SPEED;  in qca_spi_probe()
916 	if (spi->max_speed_hz < QCASPI_CLK_SPEED_MIN ||  in qca_spi_probe()
917 	    spi->max_speed_hz > QCASPI_CLK_SPEED_MAX) {  in qca_spi_probe()
918 		dev_err(&spi->dev, "Invalid clkspeed: %u\n",  in qca_spi_probe()
919 			spi->max_speed_hz);  in qca_spi_probe()
920 		return -EINVAL;  in qca_spi_probe()
925 		dev_err(&spi->dev, "Invalid burst len: %d\n",  in qca_spi_probe()
927 		return -EINVAL;  in qca_spi_probe()
932 		dev_err(&spi->dev, "Invalid pluggable: %d\n",  in qca_spi_probe()
934 		return -EINVAL;  in qca_spi_probe()
939 		dev_err(&spi->dev, "Invalid write verify: %d\n",  in qca_spi_probe()
941 		return -EINVAL;  in qca_spi_probe()
944 	dev_info(&spi->dev, "ver=%s, clkspeed=%u, burst_len=%d, pluggable=%d\n",  in qca_spi_probe()
946 		 spi->max_speed_hz,  in qca_spi_probe()
950 	spi->mode = SPI_MODE_3;  in qca_spi_probe()
952 		dev_err(&spi->dev, "Unable to setup SPI device\n");  in qca_spi_probe()
953 		return -EFAULT;  in qca_spi_probe()
958 		return -ENOMEM;  in qca_spi_probe()
961 	SET_NETDEV_DEV(qcaspi_devs, &spi->dev);  in qca_spi_probe()
966 		dev_err(&spi->dev, "Fail to retrieve private structure\n");  in qca_spi_probe()
967 		return -ENOMEM;  in qca_spi_probe()
969 	qca->net_dev = qcaspi_devs;  in qca_spi_probe()
970 	qca->spi_dev = spi;  in qca_spi_probe()
971 	qca->legacy_mode = legacy_mode;  in qca_spi_probe()
975 	ret = devm_request_irq(&spi->dev, spi->irq, qcaspi_intr_handler,  in qca_spi_probe()
976 			       IRQF_NO_AUTOEN, qca->net_dev->name, qca);  in qca_spi_probe()
978 		dev_err(&spi->dev, "Unable to get IRQ %d (irqval=%d).\n",  in qca_spi_probe()
979 			spi->irq, ret);  in qca_spi_probe()
984 	ret = of_get_ethdev_address(spi->dev.of_node, qca->net_dev);  in qca_spi_probe()
986 		eth_hw_addr_random(qca->net_dev);  in qca_spi_probe()
987 		dev_info(&spi->dev, "Using random MAC address: %pM\n",  in qca_spi_probe()
988 			 qca->net_dev->dev_addr);  in qca_spi_probe()
991 	netif_carrier_off(qca->net_dev);  in qca_spi_probe()
998 			dev_err(&spi->dev, "Invalid signature (expected 0x%04x, read 0x%04x)\n",  in qca_spi_probe()
1001 			return -EFAULT;  in qca_spi_probe()
1006 		dev_err(&spi->dev, "Unable to register net device %s\n",  in qca_spi_probe()
1007 			qcaspi_devs->name);  in qca_spi_probe()
1009 		return -EFAULT;  in qca_spi_probe()