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_debug.h"
47 #include "qca_framing.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_MTU QCAFRM_ETHMAXMTU
73 #define QCASPI_TX_TIMEOUT (1 * HZ)
74 #define QCASPI_QCA7K_REBOOT_TIME_MS 1000
77 start_spi_intr_handling(struct qcaspi
*qca
, u16
*intr_cause
)
81 qcaspi_write_register(qca
, SPI_REG_INTR_ENABLE
, 0);
82 qcaspi_read_register(qca
, SPI_REG_INTR_CAUSE
, intr_cause
);
83 netdev_dbg(qca
->net_dev
, "interrupts: 0x%04x\n", *intr_cause
);
87 end_spi_intr_handling(struct qcaspi
*qca
, u16 intr_cause
)
89 u16 intr_enable
= (SPI_INT_CPU_ON
|
94 qcaspi_write_register(qca
, SPI_REG_INTR_CAUSE
, intr_cause
);
95 qcaspi_write_register(qca
, SPI_REG_INTR_ENABLE
, intr_enable
);
96 netdev_dbg(qca
->net_dev
, "acking int: 0x%04x\n", intr_cause
);
100 qcaspi_write_burst(struct qcaspi
*qca
, u8
*src
, u32 len
)
103 struct spi_message
*msg
= &qca
->spi_msg2
;
104 struct spi_transfer
*transfer
= &qca
->spi_xfer2
[0];
107 cmd
= cpu_to_be16(QCA7K_SPI_WRITE
| QCA7K_SPI_EXTERNAL
);
108 transfer
->tx_buf
= &cmd
;
109 transfer
->rx_buf
= NULL
;
110 transfer
->len
= QCASPI_CMD_LEN
;
111 transfer
= &qca
->spi_xfer2
[1];
112 transfer
->tx_buf
= src
;
113 transfer
->rx_buf
= NULL
;
116 ret
= spi_sync(qca
->spi_dev
, msg
);
118 if (ret
|| (msg
->actual_length
!= QCASPI_CMD_LEN
+ len
)) {
119 qcaspi_spi_error(qca
);
127 qcaspi_write_legacy(struct qcaspi
*qca
, u8
*src
, u32 len
)
129 struct spi_message
*msg
= &qca
->spi_msg1
;
130 struct spi_transfer
*transfer
= &qca
->spi_xfer1
;
133 transfer
->tx_buf
= src
;
134 transfer
->rx_buf
= NULL
;
137 ret
= spi_sync(qca
->spi_dev
, msg
);
139 if (ret
|| (msg
->actual_length
!= len
)) {
140 qcaspi_spi_error(qca
);
148 qcaspi_read_burst(struct qcaspi
*qca
, u8
*dst
, u32 len
)
150 struct spi_message
*msg
= &qca
->spi_msg2
;
152 struct spi_transfer
*transfer
= &qca
->spi_xfer2
[0];
155 cmd
= cpu_to_be16(QCA7K_SPI_READ
| QCA7K_SPI_EXTERNAL
);
156 transfer
->tx_buf
= &cmd
;
157 transfer
->rx_buf
= NULL
;
158 transfer
->len
= QCASPI_CMD_LEN
;
159 transfer
= &qca
->spi_xfer2
[1];
160 transfer
->tx_buf
= NULL
;
161 transfer
->rx_buf
= dst
;
164 ret
= spi_sync(qca
->spi_dev
, msg
);
166 if (ret
|| (msg
->actual_length
!= QCASPI_CMD_LEN
+ len
)) {
167 qcaspi_spi_error(qca
);
175 qcaspi_read_legacy(struct qcaspi
*qca
, u8
*dst
, u32 len
)
177 struct spi_message
*msg
= &qca
->spi_msg1
;
178 struct spi_transfer
*transfer
= &qca
->spi_xfer1
;
181 transfer
->tx_buf
= NULL
;
182 transfer
->rx_buf
= dst
;
185 ret
= spi_sync(qca
->spi_dev
, msg
);
187 if (ret
|| (msg
->actual_length
!= len
)) {
188 qcaspi_spi_error(qca
);
196 qcaspi_tx_frame(struct qcaspi
*qca
, struct sk_buff
*skb
)
205 qcaspi_write_register(qca
, SPI_REG_BFR_SIZE
, len
);
206 if (qca
->legacy_mode
)
207 qcaspi_tx_cmd(qca
, QCA7K_SPI_WRITE
| QCA7K_SPI_EXTERNAL
);
212 if (count
> qca
->burst_len
)
213 count
= qca
->burst_len
;
215 if (qca
->legacy_mode
) {
216 written
= qcaspi_write_legacy(qca
,
220 written
= qcaspi_write_burst(qca
,
225 if (written
!= count
)
236 qcaspi_transmit(struct qcaspi
*qca
)
238 struct net_device_stats
*n_stats
= &qca
->net_dev
->stats
;
244 if (qca
->txr
.skb
[qca
->txr
.head
] == NULL
)
247 qcaspi_read_register(qca
, SPI_REG_WRBUF_SPC_AVA
, &available
);
249 while (qca
->txr
.skb
[qca
->txr
.head
]) {
250 pkt_len
= qca
->txr
.skb
[qca
->txr
.head
]->len
+ QCASPI_HW_PKT_LEN
;
252 if (available
< pkt_len
) {
254 qca
->stats
.write_buf_miss
++;
258 if (qcaspi_tx_frame(qca
, qca
->txr
.skb
[qca
->txr
.head
]) == -1) {
259 qca
->stats
.write_err
++;
264 n_stats
->tx_packets
++;
265 n_stats
->tx_bytes
+= qca
->txr
.skb
[qca
->txr
.head
]->len
;
266 available
-= pkt_len
;
268 /* remove the skb from the queue */
269 /* XXX After inconsistent lock states netif_tx_lock()
270 * has been replaced by netif_tx_lock_bh() and so on.
272 netif_tx_lock_bh(qca
->net_dev
);
273 dev_kfree_skb(qca
->txr
.skb
[qca
->txr
.head
]);
274 qca
->txr
.skb
[qca
->txr
.head
] = NULL
;
275 qca
->txr
.size
-= pkt_len
;
276 new_head
= qca
->txr
.head
+ 1;
277 if (new_head
>= qca
->txr
.count
)
279 qca
->txr
.head
= new_head
;
280 if (netif_queue_stopped(qca
->net_dev
))
281 netif_wake_queue(qca
->net_dev
);
282 netif_tx_unlock_bh(qca
->net_dev
);
289 qcaspi_receive(struct qcaspi
*qca
)
291 struct net_device
*net_dev
= qca
->net_dev
;
292 struct net_device_stats
*n_stats
= &net_dev
->stats
;
297 /* Allocate rx SKB if we don't have one available. */
299 qca
->rx_skb
= netdev_alloc_skb_ip_align(net_dev
,
303 netdev_dbg(net_dev
, "out of RX resources\n");
304 qca
->stats
.out_of_mem
++;
309 /* Read the packet size. */
310 qcaspi_read_register(qca
, SPI_REG_RDBUF_BYTE_AVA
, &available
);
311 netdev_dbg(net_dev
, "qcaspi_receive: SPI_REG_RDBUF_BYTE_AVA: Value: %08x\n",
314 if (available
== 0) {
315 netdev_dbg(net_dev
, "qcaspi_receive called without any data being available!\n");
319 qcaspi_write_register(qca
, SPI_REG_BFR_SIZE
, available
);
321 if (qca
->legacy_mode
)
322 qcaspi_tx_cmd(qca
, QCA7K_SPI_READ
| QCA7K_SPI_EXTERNAL
);
325 u32 count
= available
;
327 if (count
> qca
->burst_len
)
328 count
= qca
->burst_len
;
330 if (qca
->legacy_mode
) {
331 bytes_read
= qcaspi_read_legacy(qca
, qca
->rx_buffer
,
334 bytes_read
= qcaspi_read_burst(qca
, qca
->rx_buffer
,
338 netdev_dbg(net_dev
, "available: %d, byte read: %d\n",
339 available
, bytes_read
);
342 available
-= bytes_read
;
344 qca
->stats
.read_err
++;
350 while ((bytes_read
--) && (qca
->rx_skb
)) {
353 retcode
= qcafrm_fsm_decode(&qca
->frm_handle
,
355 skb_tailroom(qca
->rx_skb
),
363 netdev_dbg(net_dev
, "no RX tail\n");
364 n_stats
->rx_errors
++;
365 n_stats
->rx_dropped
++;
368 netdev_dbg(net_dev
, "invalid RX length\n");
369 n_stats
->rx_errors
++;
370 n_stats
->rx_dropped
++;
373 qca
->rx_skb
->dev
= qca
->net_dev
;
374 n_stats
->rx_packets
++;
375 n_stats
->rx_bytes
+= retcode
;
376 skb_put(qca
->rx_skb
, retcode
);
377 qca
->rx_skb
->protocol
= eth_type_trans(
378 qca
->rx_skb
, qca
->rx_skb
->dev
);
379 qca
->rx_skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
380 netif_rx_ni(qca
->rx_skb
);
381 qca
->rx_skb
= netdev_alloc_skb_ip_align(net_dev
,
382 net_dev
->mtu
+ VLAN_ETH_HLEN
);
384 netdev_dbg(net_dev
, "out of RX resources\n");
385 n_stats
->rx_errors
++;
386 qca
->stats
.out_of_mem
++;
396 /* Check that tx ring stores only so much bytes
397 * that fit into the internal QCA buffer.
401 qcaspi_tx_ring_has_space(struct tx_ring
*txr
)
403 if (txr
->skb
[txr
->tail
])
406 return (txr
->size
+ QCAFRM_ETHMAXLEN
< QCASPI_HW_BUF_LEN
) ? 1 : 0;
409 /* Flush the tx ring. This function is only safe to
410 * call from the qcaspi_spi_thread.
414 qcaspi_flush_tx_ring(struct qcaspi
*qca
)
418 /* XXX After inconsistent lock states netif_tx_lock()
419 * has been replaced by netif_tx_lock_bh() and so on.
421 netif_tx_lock_bh(qca
->net_dev
);
422 for (i
= 0; i
< TX_RING_MAX_LEN
; i
++) {
423 if (qca
->txr
.skb
[i
]) {
424 dev_kfree_skb(qca
->txr
.skb
[i
]);
425 qca
->txr
.skb
[i
] = NULL
;
426 qca
->net_dev
->stats
.tx_dropped
++;
432 netif_tx_unlock_bh(qca
->net_dev
);
436 qcaspi_qca7k_sync(struct qcaspi
*qca
, int event
)
441 static u16 reset_count
;
443 if (event
== QCASPI_EVENT_CPUON
) {
444 /* Read signature twice, if not valid
445 * go back to unknown state.
447 qcaspi_read_register(qca
, SPI_REG_SIGNATURE
, &signature
);
448 qcaspi_read_register(qca
, SPI_REG_SIGNATURE
, &signature
);
449 if (signature
!= QCASPI_GOOD_SIGNATURE
) {
450 qca
->sync
= QCASPI_SYNC_UNKNOWN
;
451 netdev_dbg(qca
->net_dev
, "sync: got CPU on, but signature was invalid, restart\n");
453 /* ensure that the WRBUF is empty */
454 qcaspi_read_register(qca
, SPI_REG_WRBUF_SPC_AVA
,
456 if (wrbuf_space
!= QCASPI_HW_BUF_LEN
) {
457 netdev_dbg(qca
->net_dev
, "sync: got CPU on, but wrbuf not empty. reset!\n");
458 qca
->sync
= QCASPI_SYNC_UNKNOWN
;
460 netdev_dbg(qca
->net_dev
, "sync: got CPU on, now in sync\n");
461 qca
->sync
= QCASPI_SYNC_READY
;
468 case QCASPI_SYNC_READY
:
469 /* Read signature, if not valid go to unknown state. */
470 qcaspi_read_register(qca
, SPI_REG_SIGNATURE
, &signature
);
471 if (signature
!= QCASPI_GOOD_SIGNATURE
) {
472 qca
->sync
= QCASPI_SYNC_UNKNOWN
;
473 netdev_dbg(qca
->net_dev
, "sync: bad signature, restart\n");
474 /* don't reset right away */
478 case QCASPI_SYNC_UNKNOWN
:
479 /* Read signature, if not valid stay in unknown state */
480 qcaspi_read_register(qca
, SPI_REG_SIGNATURE
, &signature
);
481 if (signature
!= QCASPI_GOOD_SIGNATURE
) {
482 netdev_dbg(qca
->net_dev
, "sync: could not read signature to reset device, retry.\n");
486 /* TODO: use GPIO to reset QCA7000 in legacy mode*/
487 netdev_dbg(qca
->net_dev
, "sync: resetting device.\n");
488 qcaspi_read_register(qca
, SPI_REG_SPI_CONFIG
, &spi_config
);
489 spi_config
|= QCASPI_SLAVE_RESET_BIT
;
490 qcaspi_write_register(qca
, SPI_REG_SPI_CONFIG
, spi_config
);
492 qca
->sync
= QCASPI_SYNC_RESET
;
493 qca
->stats
.trig_reset
++;
496 case QCASPI_SYNC_RESET
:
498 netdev_dbg(qca
->net_dev
, "sync: waiting for CPU on, count %u.\n",
500 if (reset_count
>= QCASPI_RESET_TIMEOUT
) {
501 /* reset did not seem to take place, try again */
502 qca
->sync
= QCASPI_SYNC_UNKNOWN
;
503 qca
->stats
.reset_timeout
++;
504 netdev_dbg(qca
->net_dev
, "sync: reset timeout, restarting process.\n");
511 qcaspi_spi_thread(void *data
)
513 struct qcaspi
*qca
= data
;
516 netdev_info(qca
->net_dev
, "SPI thread created\n");
517 while (!kthread_should_stop()) {
518 set_current_state(TASK_INTERRUPTIBLE
);
519 if ((qca
->intr_req
== qca
->intr_svc
) &&
520 (qca
->txr
.skb
[qca
->txr
.head
] == NULL
) &&
521 (qca
->sync
== QCASPI_SYNC_READY
))
524 set_current_state(TASK_RUNNING
);
526 netdev_dbg(qca
->net_dev
, "have work to do. int: %d, tx_skb: %p\n",
527 qca
->intr_req
- qca
->intr_svc
,
528 qca
->txr
.skb
[qca
->txr
.head
]);
530 qcaspi_qca7k_sync(qca
, QCASPI_EVENT_UPDATE
);
532 if (qca
->sync
!= QCASPI_SYNC_READY
) {
533 netdev_dbg(qca
->net_dev
, "sync: not ready %u, turn off carrier and flush\n",
534 (unsigned int)qca
->sync
);
535 netif_stop_queue(qca
->net_dev
);
536 netif_carrier_off(qca
->net_dev
);
537 qcaspi_flush_tx_ring(qca
);
538 msleep(QCASPI_QCA7K_REBOOT_TIME_MS
);
541 if (qca
->intr_svc
!= qca
->intr_req
) {
542 qca
->intr_svc
= qca
->intr_req
;
543 start_spi_intr_handling(qca
, &intr_cause
);
545 if (intr_cause
& SPI_INT_CPU_ON
) {
546 qcaspi_qca7k_sync(qca
, QCASPI_EVENT_CPUON
);
549 if (qca
->sync
!= QCASPI_SYNC_READY
)
552 qca
->stats
.device_reset
++;
553 netif_wake_queue(qca
->net_dev
);
554 netif_carrier_on(qca
->net_dev
);
557 if (intr_cause
& SPI_INT_RDBUF_ERR
) {
559 netdev_dbg(qca
->net_dev
, "===> rdbuf error!\n");
560 qca
->stats
.read_buf_err
++;
561 qca
->sync
= QCASPI_SYNC_UNKNOWN
;
565 if (intr_cause
& SPI_INT_WRBUF_ERR
) {
567 netdev_dbg(qca
->net_dev
, "===> wrbuf error!\n");
568 qca
->stats
.write_buf_err
++;
569 qca
->sync
= QCASPI_SYNC_UNKNOWN
;
573 /* can only handle other interrupts
574 * if sync has occurred
576 if (qca
->sync
== QCASPI_SYNC_READY
) {
577 if (intr_cause
& SPI_INT_PKT_AVLBL
)
581 end_spi_intr_handling(qca
, intr_cause
);
584 if (qca
->sync
== QCASPI_SYNC_READY
)
585 qcaspi_transmit(qca
);
587 set_current_state(TASK_RUNNING
);
588 netdev_info(qca
->net_dev
, "SPI thread exit\n");
594 qcaspi_intr_handler(int irq
, void *data
)
596 struct qcaspi
*qca
= data
;
599 if (qca
->spi_thread
&&
600 qca
->spi_thread
->state
!= TASK_RUNNING
)
601 wake_up_process(qca
->spi_thread
);
607 qcaspi_netdev_open(struct net_device
*dev
)
609 struct qcaspi
*qca
= netdev_priv(dev
);
617 qca
->sync
= QCASPI_SYNC_UNKNOWN
;
618 qcafrm_fsm_init(&qca
->frm_handle
);
620 qca
->spi_thread
= kthread_run((void *)qcaspi_spi_thread
,
621 qca
, "%s", dev
->name
);
623 if (IS_ERR(qca
->spi_thread
)) {
624 netdev_err(dev
, "%s: unable to start kernel thread.\n",
626 return PTR_ERR(qca
->spi_thread
);
629 ret
= request_irq(qca
->spi_dev
->irq
, qcaspi_intr_handler
, 0,
632 netdev_err(dev
, "%s: unable to get IRQ %d (irqval=%d).\n",
633 QCASPI_DRV_NAME
, qca
->spi_dev
->irq
, ret
);
634 kthread_stop(qca
->spi_thread
);
638 netif_start_queue(qca
->net_dev
);
644 qcaspi_netdev_close(struct net_device
*dev
)
646 struct qcaspi
*qca
= netdev_priv(dev
);
648 netif_stop_queue(dev
);
650 qcaspi_write_register(qca
, SPI_REG_INTR_ENABLE
, 0);
651 free_irq(qca
->spi_dev
->irq
, qca
);
653 kthread_stop(qca
->spi_thread
);
654 qca
->spi_thread
= NULL
;
655 qcaspi_flush_tx_ring(qca
);
661 qcaspi_netdev_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
665 struct qcaspi
*qca
= netdev_priv(dev
);
667 struct sk_buff
*tskb
;
670 if (skb
->len
< QCAFRM_ETHMINLEN
)
671 pad_len
= QCAFRM_ETHMINLEN
- skb
->len
;
673 if (qca
->txr
.skb
[qca
->txr
.tail
]) {
674 netdev_warn(qca
->net_dev
, "queue was unexpectedly full!\n");
675 netif_stop_queue(qca
->net_dev
);
676 qca
->stats
.ring_full
++;
677 return NETDEV_TX_BUSY
;
680 if ((skb_headroom(skb
) < QCAFRM_HEADER_LEN
) ||
681 (skb_tailroom(skb
) < QCAFRM_FOOTER_LEN
+ pad_len
)) {
682 tskb
= skb_copy_expand(skb
, QCAFRM_HEADER_LEN
,
683 QCAFRM_FOOTER_LEN
+ pad_len
, GFP_ATOMIC
);
685 netdev_dbg(qca
->net_dev
, "could not allocate tx_buff\n");
686 qca
->stats
.out_of_mem
++;
687 return NETDEV_TX_BUSY
;
693 frame_len
= skb
->len
+ pad_len
;
695 ptmp
= skb_push(skb
, QCAFRM_HEADER_LEN
);
696 qcafrm_create_header(ptmp
, frame_len
);
699 ptmp
= skb_put(skb
, pad_len
);
700 memset(ptmp
, 0, pad_len
);
703 ptmp
= skb_put(skb
, QCAFRM_FOOTER_LEN
);
704 qcafrm_create_footer(ptmp
);
706 netdev_dbg(qca
->net_dev
, "Tx-ing packet: Size: 0x%08x\n",
709 qca
->txr
.size
+= skb
->len
+ QCASPI_HW_PKT_LEN
;
711 new_tail
= qca
->txr
.tail
+ 1;
712 if (new_tail
>= qca
->txr
.count
)
715 qca
->txr
.skb
[qca
->txr
.tail
] = skb
;
716 qca
->txr
.tail
= new_tail
;
718 if (!qcaspi_tx_ring_has_space(&qca
->txr
)) {
719 netif_stop_queue(qca
->net_dev
);
720 qca
->stats
.ring_full
++;
723 netif_trans_update(dev
);
725 if (qca
->spi_thread
&&
726 qca
->spi_thread
->state
!= TASK_RUNNING
)
727 wake_up_process(qca
->spi_thread
);
733 qcaspi_netdev_tx_timeout(struct net_device
*dev
)
735 struct qcaspi
*qca
= netdev_priv(dev
);
737 netdev_info(qca
->net_dev
, "Transmit timeout at %ld, latency %ld\n",
738 jiffies
, jiffies
- dev_trans_start(dev
));
739 qca
->net_dev
->stats
.tx_errors
++;
740 /* Trigger tx queue flush and QCA7000 reset */
741 qca
->sync
= QCASPI_SYNC_UNKNOWN
;
745 qcaspi_netdev_init(struct net_device
*dev
)
747 struct qcaspi
*qca
= netdev_priv(dev
);
749 dev
->mtu
= QCASPI_MTU
;
750 dev
->type
= ARPHRD_ETHER
;
751 qca
->clkspeed
= qcaspi_clkspeed
;
752 qca
->burst_len
= qcaspi_burst_len
;
753 qca
->spi_thread
= NULL
;
754 qca
->buffer_size
= (dev
->mtu
+ VLAN_ETH_HLEN
+ QCAFRM_HEADER_LEN
+
755 QCAFRM_FOOTER_LEN
+ 4) * 4;
757 memset(&qca
->stats
, 0, sizeof(struct qcaspi_stats
));
759 qca
->rx_buffer
= kmalloc(qca
->buffer_size
, GFP_KERNEL
);
763 qca
->rx_skb
= netdev_alloc_skb_ip_align(dev
, qca
->net_dev
->mtu
+
766 kfree(qca
->rx_buffer
);
767 netdev_info(qca
->net_dev
, "Failed to allocate RX sk_buff.\n");
775 qcaspi_netdev_uninit(struct net_device
*dev
)
777 struct qcaspi
*qca
= netdev_priv(dev
);
779 kfree(qca
->rx_buffer
);
780 qca
->buffer_size
= 0;
782 dev_kfree_skb(qca
->rx_skb
);
785 static const struct net_device_ops qcaspi_netdev_ops
= {
786 .ndo_init
= qcaspi_netdev_init
,
787 .ndo_uninit
= qcaspi_netdev_uninit
,
788 .ndo_open
= qcaspi_netdev_open
,
789 .ndo_stop
= qcaspi_netdev_close
,
790 .ndo_start_xmit
= qcaspi_netdev_xmit
,
791 .ndo_set_mac_address
= eth_mac_addr
,
792 .ndo_tx_timeout
= qcaspi_netdev_tx_timeout
,
793 .ndo_validate_addr
= eth_validate_addr
,
797 qcaspi_netdev_setup(struct net_device
*dev
)
799 struct qcaspi
*qca
= NULL
;
801 dev
->netdev_ops
= &qcaspi_netdev_ops
;
802 qcaspi_set_ethtool_ops(dev
);
803 dev
->watchdog_timeo
= QCASPI_TX_TIMEOUT
;
804 dev
->priv_flags
&= ~IFF_TX_SKB_SHARING
;
805 dev
->tx_queue_len
= 100;
807 /* MTU range: 46 - 1500 */
808 dev
->min_mtu
= QCAFRM_ETHMINMTU
;
809 dev
->max_mtu
= QCAFRM_ETHMAXMTU
;
811 qca
= netdev_priv(dev
);
812 memset(qca
, 0, sizeof(struct qcaspi
));
814 memset(&qca
->spi_xfer1
, 0, sizeof(struct spi_transfer
));
815 memset(&qca
->spi_xfer2
, 0, sizeof(struct spi_transfer
) * 2);
817 spi_message_init(&qca
->spi_msg1
);
818 spi_message_add_tail(&qca
->spi_xfer1
, &qca
->spi_msg1
);
820 spi_message_init(&qca
->spi_msg2
);
821 spi_message_add_tail(&qca
->spi_xfer2
[0], &qca
->spi_msg2
);
822 spi_message_add_tail(&qca
->spi_xfer2
[1], &qca
->spi_msg2
);
824 memset(&qca
->txr
, 0, sizeof(qca
->txr
));
825 qca
->txr
.count
= TX_RING_MAX_LEN
;
828 static const struct of_device_id qca_spi_of_match
[] = {
829 { .compatible
= "qca,qca7000" },
832 MODULE_DEVICE_TABLE(of
, qca_spi_of_match
);
835 qca_spi_probe(struct spi_device
*spi
)
837 struct qcaspi
*qca
= NULL
;
838 struct net_device
*qcaspi_devs
= NULL
;
843 if (!spi
->dev
.of_node
) {
844 dev_err(&spi
->dev
, "Missing device tree\n");
848 legacy_mode
= of_property_read_bool(spi
->dev
.of_node
,
851 if (qcaspi_clkspeed
== 0) {
852 if (spi
->max_speed_hz
)
853 qcaspi_clkspeed
= spi
->max_speed_hz
;
855 qcaspi_clkspeed
= QCASPI_CLK_SPEED
;
858 if ((qcaspi_clkspeed
< QCASPI_CLK_SPEED_MIN
) ||
859 (qcaspi_clkspeed
> QCASPI_CLK_SPEED_MAX
)) {
860 dev_info(&spi
->dev
, "Invalid clkspeed: %d\n",
865 if ((qcaspi_burst_len
< QCASPI_BURST_LEN_MIN
) ||
866 (qcaspi_burst_len
> QCASPI_BURST_LEN_MAX
)) {
867 dev_info(&spi
->dev
, "Invalid burst len: %d\n",
872 if ((qcaspi_pluggable
< QCASPI_PLUGGABLE_MIN
) ||
873 (qcaspi_pluggable
> QCASPI_PLUGGABLE_MAX
)) {
874 dev_info(&spi
->dev
, "Invalid pluggable: %d\n",
879 dev_info(&spi
->dev
, "ver=%s, clkspeed=%d, burst_len=%d, pluggable=%d\n",
885 spi
->mode
= SPI_MODE_3
;
886 spi
->max_speed_hz
= qcaspi_clkspeed
;
887 if (spi_setup(spi
) < 0) {
888 dev_err(&spi
->dev
, "Unable to setup SPI device\n");
892 qcaspi_devs
= alloc_etherdev(sizeof(struct qcaspi
));
896 qcaspi_netdev_setup(qcaspi_devs
);
898 qca
= netdev_priv(qcaspi_devs
);
900 free_netdev(qcaspi_devs
);
901 dev_err(&spi
->dev
, "Fail to retrieve private structure\n");
904 qca
->net_dev
= qcaspi_devs
;
906 qca
->legacy_mode
= legacy_mode
;
908 spi_set_drvdata(spi
, qcaspi_devs
);
910 mac
= of_get_mac_address(spi
->dev
.of_node
);
913 ether_addr_copy(qca
->net_dev
->dev_addr
, mac
);
915 if (!is_valid_ether_addr(qca
->net_dev
->dev_addr
)) {
916 eth_hw_addr_random(qca
->net_dev
);
917 dev_info(&spi
->dev
, "Using random MAC address: %pM\n",
918 qca
->net_dev
->dev_addr
);
921 netif_carrier_off(qca
->net_dev
);
923 if (!qcaspi_pluggable
) {
924 qcaspi_read_register(qca
, SPI_REG_SIGNATURE
, &signature
);
925 qcaspi_read_register(qca
, SPI_REG_SIGNATURE
, &signature
);
927 if (signature
!= QCASPI_GOOD_SIGNATURE
) {
928 dev_err(&spi
->dev
, "Invalid signature (0x%04X)\n",
930 free_netdev(qcaspi_devs
);
935 if (register_netdev(qcaspi_devs
)) {
936 dev_info(&spi
->dev
, "Unable to register net device %s\n",
938 free_netdev(qcaspi_devs
);
942 qcaspi_init_device_debugfs(qca
);
948 qca_spi_remove(struct spi_device
*spi
)
950 struct net_device
*qcaspi_devs
= spi_get_drvdata(spi
);
951 struct qcaspi
*qca
= netdev_priv(qcaspi_devs
);
953 qcaspi_remove_device_debugfs(qca
);
955 unregister_netdev(qcaspi_devs
);
956 free_netdev(qcaspi_devs
);
961 static const struct spi_device_id qca_spi_id
[] = {
965 MODULE_DEVICE_TABLE(spi
, qca_spi_id
);
967 static struct spi_driver qca_spi_driver
= {
969 .name
= QCASPI_DRV_NAME
,
970 .of_match_table
= qca_spi_of_match
,
972 .id_table
= qca_spi_id
,
973 .probe
= qca_spi_probe
,
974 .remove
= qca_spi_remove
,
976 module_spi_driver(qca_spi_driver
);
978 MODULE_DESCRIPTION("Qualcomm Atheros SPI Driver");
979 MODULE_AUTHOR("Qualcomm Atheros Communications");
980 MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
981 MODULE_LICENSE("Dual BSD/GPL");
982 MODULE_VERSION(QCASPI_DRV_VERSION
);