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26#include <linux/atomic.h>
27#include <linux/clk.h>
28#include <linux/device.h>
29#include <linux/err.h>
30#include <linux/gpio.h>
31#include <linux/if_ether.h>
32#include <linux/if_arp.h>
33#include <linux/if_phonet.h>
34#include <linux/init.h>
35#include <linux/irq.h>
36#include <linux/list.h>
37#include <linux/module.h>
38#include <linux/netdevice.h>
39#include <linux/notifier.h>
40#include <linux/scatterlist.h>
41#include <linux/skbuff.h>
42#include <linux/slab.h>
43#include <linux/spinlock.h>
44#include <linux/timer.h>
45#include <linux/hsi/hsi.h>
46#include <linux/hsi/ssi_protocol.h>
47
48void ssi_waketest(struct hsi_client *cl, unsigned int enable);
49
50#define SSIP_TXQUEUE_LEN 100
51#define SSIP_MAX_MTU 65535
52#define SSIP_DEFAULT_MTU 4000
53#define PN_MEDIA_SOS 21
54#define SSIP_MIN_PN_HDR 6
55#define SSIP_WDTOUT 2000
56#define SSIP_KATOUT 15
57#define SSIP_MAX_CMDS 5
58#define SSIP_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
59#define SSIP_CMT_LOADER_SYNC 0x11223344
60
61
62
63#define SSIP_COMMAND(data) ((data) >> 28)
64#define SSIP_PAYLOAD(data) ((data) & 0xfffffff)
65
66#define SSIP_SW_BREAK 0
67#define SSIP_BOOTINFO_REQ 1
68#define SSIP_BOOTINFO_RESP 2
69#define SSIP_WAKETEST_RESULT 3
70#define SSIP_START_TRANS 4
71#define SSIP_READY 5
72
73#define SSIP_DATA_VERSION(data) ((data) & 0xff)
74#define SSIP_LOCAL_VERID 1
75#define SSIP_WAKETEST_OK 0
76#define SSIP_WAKETEST_FAILED 1
77#define SSIP_PDU_LENGTH(data) (((data) >> 8) & 0xffff)
78#define SSIP_MSG_ID(data) ((data) & 0xff)
79
80#define SSIP_CMD(cmd, payload) (((cmd) << 28) | ((payload) & 0xfffffff))
81
82#define SSIP_BOOTINFO_REQ_CMD(ver) \
83 SSIP_CMD(SSIP_BOOTINFO_REQ, SSIP_DATA_VERSION(ver))
84#define SSIP_BOOTINFO_RESP_CMD(ver) \
85 SSIP_CMD(SSIP_BOOTINFO_RESP, SSIP_DATA_VERSION(ver))
86#define SSIP_START_TRANS_CMD(pdulen, id) \
87 SSIP_CMD(SSIP_START_TRANS, (((pdulen) << 8) | SSIP_MSG_ID(id)))
88#define SSIP_READY_CMD SSIP_CMD(SSIP_READY, 0)
89#define SSIP_SWBREAK_CMD SSIP_CMD(SSIP_SW_BREAK, 0)
90
91#define SSIP_WAKETEST_FLAG 0
92
93
94enum {
95 INIT,
96 HANDSHAKE,
97 ACTIVE,
98};
99
100
101enum {
102 SEND_IDLE,
103 WAIT4READY,
104 SEND_READY,
105 SENDING,
106 SENDING_SWBREAK,
107};
108
109
110enum {
111 RECV_IDLE,
112 RECV_READY,
113 RECEIVING,
114};
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138struct ssi_protocol {
139 unsigned int main_state;
140 unsigned int send_state;
141 unsigned int recv_state;
142 unsigned long flags;
143 u8 rxid;
144 u8 txid;
145 unsigned int txqueue_len;
146 struct timer_list tx_wd;
147 struct timer_list rx_wd;
148 struct timer_list keep_alive;
149 spinlock_t lock;
150 struct net_device *netdev;
151 struct list_head txqueue;
152 struct list_head cmdqueue;
153 struct work_struct work;
154 struct hsi_client *cl;
155 struct list_head link;
156 atomic_t tx_usecnt;
157 int channel_id_cmd;
158 int channel_id_data;
159};
160
161
162static LIST_HEAD(ssip_list);
163
164static void ssip_rxcmd_complete(struct hsi_msg *msg);
165
166static inline void ssip_set_cmd(struct hsi_msg *msg, u32 cmd)
167{
168 u32 *data;
169
170 data = sg_virt(msg->sgt.sgl);
171 *data = cmd;
172}
173
174static inline u32 ssip_get_cmd(struct hsi_msg *msg)
175{
176 u32 *data;
177
178 data = sg_virt(msg->sgt.sgl);
179
180 return *data;
181}
182
183static void ssip_skb_to_msg(struct sk_buff *skb, struct hsi_msg *msg)
184{
185 skb_frag_t *frag;
186 struct scatterlist *sg;
187 int i;
188
189 BUG_ON(msg->sgt.nents != (unsigned int)(skb_shinfo(skb)->nr_frags + 1));
190
191 sg = msg->sgt.sgl;
192 sg_set_buf(sg, skb->data, skb_headlen(skb));
193 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
194 sg = sg_next(sg);
195 BUG_ON(!sg);
196 frag = &skb_shinfo(skb)->frags[i];
197 sg_set_page(sg, frag->page.p, frag->size, frag->page_offset);
198 }
199}
200
201static void ssip_free_data(struct hsi_msg *msg)
202{
203 struct sk_buff *skb;
204
205 skb = msg->context;
206 pr_debug("free data: msg %p context %p skb %p\n", msg, msg->context,
207 skb);
208 msg->destructor = NULL;
209 dev_kfree_skb(skb);
210 hsi_free_msg(msg);
211}
212
213static struct hsi_msg *ssip_alloc_data(struct ssi_protocol *ssi,
214 struct sk_buff *skb, gfp_t flags)
215{
216 struct hsi_msg *msg;
217
218 msg = hsi_alloc_msg(skb_shinfo(skb)->nr_frags + 1, flags);
219 if (!msg)
220 return NULL;
221 ssip_skb_to_msg(skb, msg);
222 msg->destructor = ssip_free_data;
223 msg->channel = ssi->channel_id_data;
224 msg->context = skb;
225
226 return msg;
227}
228
229static inline void ssip_release_cmd(struct hsi_msg *msg)
230{
231 struct ssi_protocol *ssi = hsi_client_drvdata(msg->cl);
232
233 dev_dbg(&msg->cl->device, "Release cmd 0x%08x\n", ssip_get_cmd(msg));
234 spin_lock_bh(&ssi->lock);
235 list_add_tail(&msg->link, &ssi->cmdqueue);
236 spin_unlock_bh(&ssi->lock);
237}
238
239static struct hsi_msg *ssip_claim_cmd(struct ssi_protocol *ssi)
240{
241 struct hsi_msg *msg;
242
243 BUG_ON(list_empty(&ssi->cmdqueue));
244
245 spin_lock_bh(&ssi->lock);
246 msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link);
247 list_del(&msg->link);
248 spin_unlock_bh(&ssi->lock);
249 msg->destructor = ssip_release_cmd;
250
251 return msg;
252}
253
254static void ssip_free_cmds(struct ssi_protocol *ssi)
255{
256 struct hsi_msg *msg, *tmp;
257
258 list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) {
259 list_del(&msg->link);
260 msg->destructor = NULL;
261 kfree(sg_virt(msg->sgt.sgl));
262 hsi_free_msg(msg);
263 }
264}
265
266static int ssip_alloc_cmds(struct ssi_protocol *ssi)
267{
268 struct hsi_msg *msg;
269 u32 *buf;
270 unsigned int i;
271
272 for (i = 0; i < SSIP_MAX_CMDS; i++) {
273 msg = hsi_alloc_msg(1, GFP_KERNEL);
274 if (!msg)
275 goto out;
276 buf = kmalloc(sizeof(*buf), GFP_KERNEL);
277 if (!buf) {
278 hsi_free_msg(msg);
279 goto out;
280 }
281 sg_init_one(msg->sgt.sgl, buf, sizeof(*buf));
282 msg->channel = ssi->channel_id_cmd;
283 list_add_tail(&msg->link, &ssi->cmdqueue);
284 }
285
286 return 0;
287out:
288 ssip_free_cmds(ssi);
289
290 return -ENOMEM;
291}
292
293static void ssip_set_rxstate(struct ssi_protocol *ssi, unsigned int state)
294{
295 ssi->recv_state = state;
296 switch (state) {
297 case RECV_IDLE:
298 del_timer(&ssi->rx_wd);
299 if (ssi->send_state == SEND_IDLE)
300 del_timer(&ssi->keep_alive);
301 break;
302 case RECV_READY:
303
304 if (atomic_read(&ssi->tx_usecnt))
305 break;
306
307 case RECEIVING:
308 mod_timer(&ssi->keep_alive, jiffies +
309 msecs_to_jiffies(SSIP_KATOUT));
310 mod_timer(&ssi->rx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
311 break;
312 default:
313 break;
314 }
315}
316
317static void ssip_set_txstate(struct ssi_protocol *ssi, unsigned int state)
318{
319 ssi->send_state = state;
320 switch (state) {
321 case SEND_IDLE:
322 case SEND_READY:
323 del_timer(&ssi->tx_wd);
324 if (ssi->recv_state == RECV_IDLE)
325 del_timer(&ssi->keep_alive);
326 break;
327 case WAIT4READY:
328 case SENDING:
329 case SENDING_SWBREAK:
330 mod_timer(&ssi->keep_alive,
331 jiffies + msecs_to_jiffies(SSIP_KATOUT));
332 mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
333 break;
334 default:
335 break;
336 }
337}
338
339struct hsi_client *ssip_slave_get_master(struct hsi_client *slave)
340{
341 struct hsi_client *master = ERR_PTR(-ENODEV);
342 struct ssi_protocol *ssi;
343
344 list_for_each_entry(ssi, &ssip_list, link)
345 if (slave->device.parent == ssi->cl->device.parent) {
346 master = ssi->cl;
347 break;
348 }
349
350 return master;
351}
352EXPORT_SYMBOL_GPL(ssip_slave_get_master);
353
354int ssip_slave_start_tx(struct hsi_client *master)
355{
356 struct ssi_protocol *ssi = hsi_client_drvdata(master);
357
358 dev_dbg(&master->device, "start TX %d\n", atomic_read(&ssi->tx_usecnt));
359 spin_lock_bh(&ssi->lock);
360 if (ssi->send_state == SEND_IDLE) {
361 ssip_set_txstate(ssi, WAIT4READY);
362 hsi_start_tx(master);
363 }
364 spin_unlock_bh(&ssi->lock);
365 atomic_inc(&ssi->tx_usecnt);
366
367 return 0;
368}
369EXPORT_SYMBOL_GPL(ssip_slave_start_tx);
370
371int ssip_slave_stop_tx(struct hsi_client *master)
372{
373 struct ssi_protocol *ssi = hsi_client_drvdata(master);
374
375 WARN_ON_ONCE(atomic_read(&ssi->tx_usecnt) == 0);
376
377 if (atomic_dec_and_test(&ssi->tx_usecnt)) {
378 spin_lock_bh(&ssi->lock);
379 if ((ssi->send_state == SEND_READY) ||
380 (ssi->send_state == WAIT4READY)) {
381 ssip_set_txstate(ssi, SEND_IDLE);
382 hsi_stop_tx(master);
383 }
384 spin_unlock_bh(&ssi->lock);
385 }
386 dev_dbg(&master->device, "stop TX %d\n", atomic_read(&ssi->tx_usecnt));
387
388 return 0;
389}
390EXPORT_SYMBOL_GPL(ssip_slave_stop_tx);
391
392int ssip_slave_running(struct hsi_client *master)
393{
394 struct ssi_protocol *ssi = hsi_client_drvdata(master);
395 return netif_running(ssi->netdev);
396}
397EXPORT_SYMBOL_GPL(ssip_slave_running);
398
399static void ssip_reset(struct hsi_client *cl)
400{
401 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
402 struct list_head *head, *tmp;
403 struct hsi_msg *msg;
404
405 if (netif_running(ssi->netdev))
406 netif_carrier_off(ssi->netdev);
407 hsi_flush(cl);
408 spin_lock_bh(&ssi->lock);
409 if (ssi->send_state != SEND_IDLE)
410 hsi_stop_tx(cl);
411 spin_unlock_bh(&ssi->lock);
412 if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
413 ssi_waketest(cl, 0);
414 spin_lock_bh(&ssi->lock);
415 del_timer(&ssi->rx_wd);
416 del_timer(&ssi->tx_wd);
417 del_timer(&ssi->keep_alive);
418 ssi->main_state = 0;
419 ssi->send_state = 0;
420 ssi->recv_state = 0;
421 ssi->flags = 0;
422 ssi->rxid = 0;
423 ssi->txid = 0;
424 list_for_each_safe(head, tmp, &ssi->txqueue) {
425 msg = list_entry(head, struct hsi_msg, link);
426 dev_dbg(&cl->device, "Pending TX data\n");
427 list_del(head);
428 ssip_free_data(msg);
429 }
430 ssi->txqueue_len = 0;
431 spin_unlock_bh(&ssi->lock);
432}
433
434static void ssip_dump_state(struct hsi_client *cl)
435{
436 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
437 struct hsi_msg *msg;
438
439 spin_lock_bh(&ssi->lock);
440 dev_err(&cl->device, "Main state: %d\n", ssi->main_state);
441 dev_err(&cl->device, "Recv state: %d\n", ssi->recv_state);
442 dev_err(&cl->device, "Send state: %d\n", ssi->send_state);
443 dev_err(&cl->device, "CMT %s\n", (ssi->main_state == ACTIVE) ?
444 "Online" : "Offline");
445 dev_err(&cl->device, "Wake test %d\n",
446 test_bit(SSIP_WAKETEST_FLAG, &ssi->flags));
447 dev_err(&cl->device, "Data RX id: %d\n", ssi->rxid);
448 dev_err(&cl->device, "Data TX id: %d\n", ssi->txid);
449
450 list_for_each_entry(msg, &ssi->txqueue, link)
451 dev_err(&cl->device, "pending TX data (%p)\n", msg);
452 spin_unlock_bh(&ssi->lock);
453}
454
455static void ssip_error(struct hsi_client *cl)
456{
457 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
458 struct hsi_msg *msg;
459
460 ssip_dump_state(cl);
461 ssip_reset(cl);
462 msg = ssip_claim_cmd(ssi);
463 msg->complete = ssip_rxcmd_complete;
464 hsi_async_read(cl, msg);
465}
466
467static void ssip_keep_alive(struct timer_list *t)
468{
469 struct ssi_protocol *ssi = from_timer(ssi, t, keep_alive);
470 struct hsi_client *cl = ssi->cl;
471
472 dev_dbg(&cl->device, "Keep alive kick in: m(%d) r(%d) s(%d)\n",
473 ssi->main_state, ssi->recv_state, ssi->send_state);
474
475 spin_lock(&ssi->lock);
476 if (ssi->recv_state == RECV_IDLE)
477 switch (ssi->send_state) {
478 case SEND_READY:
479 if (atomic_read(&ssi->tx_usecnt) == 0)
480 break;
481
482
483
484
485 case SEND_IDLE:
486 spin_unlock(&ssi->lock);
487 return;
488 }
489 mod_timer(&ssi->keep_alive, jiffies + msecs_to_jiffies(SSIP_KATOUT));
490 spin_unlock(&ssi->lock);
491}
492
493static void ssip_rx_wd(struct timer_list *t)
494{
495 struct ssi_protocol *ssi = from_timer(ssi, t, rx_wd);
496 struct hsi_client *cl = ssi->cl;
497
498 dev_err(&cl->device, "Watchdog triggered\n");
499 ssip_error(cl);
500}
501
502static void ssip_tx_wd(struct timer_list *t)
503{
504 struct ssi_protocol *ssi = from_timer(ssi, t, tx_wd);
505 struct hsi_client *cl = ssi->cl;
506
507 dev_err(&cl->device, "Watchdog triggered\n");
508 ssip_error(cl);
509}
510
511static void ssip_send_bootinfo_req_cmd(struct hsi_client *cl)
512{
513 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
514 struct hsi_msg *msg;
515
516 dev_dbg(&cl->device, "Issuing BOOT INFO REQ command\n");
517 msg = ssip_claim_cmd(ssi);
518 ssip_set_cmd(msg, SSIP_BOOTINFO_REQ_CMD(SSIP_LOCAL_VERID));
519 msg->complete = ssip_release_cmd;
520 hsi_async_write(cl, msg);
521 dev_dbg(&cl->device, "Issuing RX command\n");
522 msg = ssip_claim_cmd(ssi);
523 msg->complete = ssip_rxcmd_complete;
524 hsi_async_read(cl, msg);
525}
526
527static void ssip_start_rx(struct hsi_client *cl)
528{
529 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
530 struct hsi_msg *msg;
531
532 dev_dbg(&cl->device, "RX start M(%d) R(%d)\n", ssi->main_state,
533 ssi->recv_state);
534 spin_lock_bh(&ssi->lock);
535
536
537
538
539 if ((ssi->main_state != ACTIVE) || (ssi->recv_state == RECV_READY)) {
540 spin_unlock_bh(&ssi->lock);
541 return;
542 }
543 ssip_set_rxstate(ssi, RECV_READY);
544 spin_unlock_bh(&ssi->lock);
545
546 msg = ssip_claim_cmd(ssi);
547 ssip_set_cmd(msg, SSIP_READY_CMD);
548 msg->complete = ssip_release_cmd;
549 dev_dbg(&cl->device, "Send READY\n");
550 hsi_async_write(cl, msg);
551}
552
553static void ssip_stop_rx(struct hsi_client *cl)
554{
555 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
556
557 dev_dbg(&cl->device, "RX stop M(%d)\n", ssi->main_state);
558 spin_lock_bh(&ssi->lock);
559 if (likely(ssi->main_state == ACTIVE))
560 ssip_set_rxstate(ssi, RECV_IDLE);
561 spin_unlock_bh(&ssi->lock);
562}
563
564static void ssip_free_strans(struct hsi_msg *msg)
565{
566 ssip_free_data(msg->context);
567 ssip_release_cmd(msg);
568}
569
570static void ssip_strans_complete(struct hsi_msg *msg)
571{
572 struct hsi_client *cl = msg->cl;
573 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
574 struct hsi_msg *data;
575
576 data = msg->context;
577 ssip_release_cmd(msg);
578 spin_lock_bh(&ssi->lock);
579 ssip_set_txstate(ssi, SENDING);
580 spin_unlock_bh(&ssi->lock);
581 hsi_async_write(cl, data);
582}
583
584static int ssip_xmit(struct hsi_client *cl)
585{
586 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
587 struct hsi_msg *msg, *dmsg;
588 struct sk_buff *skb;
589
590 spin_lock_bh(&ssi->lock);
591 if (list_empty(&ssi->txqueue)) {
592 spin_unlock_bh(&ssi->lock);
593 return 0;
594 }
595 dmsg = list_first_entry(&ssi->txqueue, struct hsi_msg, link);
596 list_del(&dmsg->link);
597 ssi->txqueue_len--;
598 spin_unlock_bh(&ssi->lock);
599
600 msg = ssip_claim_cmd(ssi);
601 skb = dmsg->context;
602 msg->context = dmsg;
603 msg->complete = ssip_strans_complete;
604 msg->destructor = ssip_free_strans;
605
606 spin_lock_bh(&ssi->lock);
607 ssip_set_cmd(msg, SSIP_START_TRANS_CMD(SSIP_BYTES_TO_FRAMES(skb->len),
608 ssi->txid));
609 ssi->txid++;
610 ssip_set_txstate(ssi, SENDING);
611 spin_unlock_bh(&ssi->lock);
612
613 dev_dbg(&cl->device, "Send STRANS (%d frames)\n",
614 SSIP_BYTES_TO_FRAMES(skb->len));
615
616 return hsi_async_write(cl, msg);
617}
618
619
620static void ssip_pn_rx(struct sk_buff *skb)
621{
622 struct net_device *dev = skb->dev;
623
624 if (unlikely(!netif_running(dev))) {
625 dev_dbg(&dev->dev, "Drop RX packet\n");
626 dev->stats.rx_dropped++;
627 dev_kfree_skb(skb);
628 return;
629 }
630 if (unlikely(!pskb_may_pull(skb, SSIP_MIN_PN_HDR))) {
631 dev_dbg(&dev->dev, "Error drop RX packet\n");
632 dev->stats.rx_errors++;
633 dev->stats.rx_length_errors++;
634 dev_kfree_skb(skb);
635 return;
636 }
637 dev->stats.rx_packets++;
638 dev->stats.rx_bytes += skb->len;
639
640
641 ((u16 *)skb->data)[2] = ntohs(((u16 *)skb->data)[2]);
642 dev_dbg(&dev->dev, "RX length fixed (%04x -> %u)\n",
643 ((u16 *)skb->data)[2], ntohs(((u16 *)skb->data)[2]));
644
645 skb->protocol = htons(ETH_P_PHONET);
646 skb_reset_mac_header(skb);
647 __skb_pull(skb, 1);
648 netif_rx(skb);
649}
650
651static void ssip_rx_data_complete(struct hsi_msg *msg)
652{
653 struct hsi_client *cl = msg->cl;
654 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
655 struct sk_buff *skb;
656
657 if (msg->status == HSI_STATUS_ERROR) {
658 dev_err(&cl->device, "RX data error\n");
659 ssip_free_data(msg);
660 ssip_error(cl);
661 return;
662 }
663 del_timer(&ssi->rx_wd);
664 skb = msg->context;
665 ssip_pn_rx(skb);
666 hsi_free_msg(msg);
667}
668
669static void ssip_rx_bootinforeq(struct hsi_client *cl, u32 cmd)
670{
671 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
672 struct hsi_msg *msg;
673
674
675 if (cmd == SSIP_CMT_LOADER_SYNC)
676 return;
677
678 switch (ssi->main_state) {
679 case ACTIVE:
680 dev_err(&cl->device, "Boot info req on active state\n");
681 ssip_error(cl);
682
683 case INIT:
684 case HANDSHAKE:
685 spin_lock_bh(&ssi->lock);
686 ssi->main_state = HANDSHAKE;
687 spin_unlock_bh(&ssi->lock);
688
689 if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
690 ssi_waketest(cl, 1);
691
692 spin_lock_bh(&ssi->lock);
693
694 mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
695 spin_unlock_bh(&ssi->lock);
696 dev_dbg(&cl->device, "Send BOOTINFO_RESP\n");
697 if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID)
698 dev_warn(&cl->device, "boot info req verid mismatch\n");
699 msg = ssip_claim_cmd(ssi);
700 ssip_set_cmd(msg, SSIP_BOOTINFO_RESP_CMD(SSIP_LOCAL_VERID));
701 msg->complete = ssip_release_cmd;
702 hsi_async_write(cl, msg);
703 break;
704 default:
705 dev_dbg(&cl->device, "Wrong state M(%d)\n", ssi->main_state);
706 break;
707 }
708}
709
710static void ssip_rx_bootinforesp(struct hsi_client *cl, u32 cmd)
711{
712 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
713
714 if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID)
715 dev_warn(&cl->device, "boot info resp verid mismatch\n");
716
717 spin_lock_bh(&ssi->lock);
718 if (ssi->main_state != ACTIVE)
719
720 mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
721 else
722 dev_dbg(&cl->device, "boot info resp ignored M(%d)\n",
723 ssi->main_state);
724 spin_unlock_bh(&ssi->lock);
725}
726
727static void ssip_rx_waketest(struct hsi_client *cl, u32 cmd)
728{
729 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
730 unsigned int wkres = SSIP_PAYLOAD(cmd);
731
732 spin_lock_bh(&ssi->lock);
733 if (ssi->main_state != HANDSHAKE) {
734 dev_dbg(&cl->device, "wake lines test ignored M(%d)\n",
735 ssi->main_state);
736 spin_unlock_bh(&ssi->lock);
737 return;
738 }
739 spin_unlock_bh(&ssi->lock);
740
741 if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
742 ssi_waketest(cl, 0);
743
744 spin_lock_bh(&ssi->lock);
745 ssi->main_state = ACTIVE;
746 del_timer(&ssi->tx_wd);
747 spin_unlock_bh(&ssi->lock);
748
749 dev_notice(&cl->device, "WAKELINES TEST %s\n",
750 wkres & SSIP_WAKETEST_FAILED ? "FAILED" : "OK");
751 if (wkres & SSIP_WAKETEST_FAILED) {
752 ssip_error(cl);
753 return;
754 }
755 dev_dbg(&cl->device, "CMT is ONLINE\n");
756 netif_wake_queue(ssi->netdev);
757 netif_carrier_on(ssi->netdev);
758}
759
760static void ssip_rx_ready(struct hsi_client *cl)
761{
762 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
763
764 spin_lock_bh(&ssi->lock);
765 if (unlikely(ssi->main_state != ACTIVE)) {
766 dev_dbg(&cl->device, "READY on wrong state: S(%d) M(%d)\n",
767 ssi->send_state, ssi->main_state);
768 spin_unlock_bh(&ssi->lock);
769 return;
770 }
771 if (ssi->send_state != WAIT4READY) {
772 dev_dbg(&cl->device, "Ignore spurious READY command\n");
773 spin_unlock_bh(&ssi->lock);
774 return;
775 }
776 ssip_set_txstate(ssi, SEND_READY);
777 spin_unlock_bh(&ssi->lock);
778 ssip_xmit(cl);
779}
780
781static void ssip_rx_strans(struct hsi_client *cl, u32 cmd)
782{
783 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
784 struct sk_buff *skb;
785 struct hsi_msg *msg;
786 int len = SSIP_PDU_LENGTH(cmd);
787
788 dev_dbg(&cl->device, "RX strans: %d frames\n", len);
789 spin_lock_bh(&ssi->lock);
790 if (unlikely(ssi->main_state != ACTIVE)) {
791 dev_err(&cl->device, "START TRANS wrong state: S(%d) M(%d)\n",
792 ssi->send_state, ssi->main_state);
793 spin_unlock_bh(&ssi->lock);
794 return;
795 }
796 ssip_set_rxstate(ssi, RECEIVING);
797 if (unlikely(SSIP_MSG_ID(cmd) != ssi->rxid)) {
798 dev_err(&cl->device, "START TRANS id %d expected %d\n",
799 SSIP_MSG_ID(cmd), ssi->rxid);
800 spin_unlock_bh(&ssi->lock);
801 goto out1;
802 }
803 ssi->rxid++;
804 spin_unlock_bh(&ssi->lock);
805 skb = netdev_alloc_skb(ssi->netdev, len * 4);
806 if (unlikely(!skb)) {
807 dev_err(&cl->device, "No memory for rx skb\n");
808 goto out1;
809 }
810 skb->dev = ssi->netdev;
811 skb_put(skb, len * 4);
812 msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC);
813 if (unlikely(!msg)) {
814 dev_err(&cl->device, "No memory for RX data msg\n");
815 goto out2;
816 }
817 msg->complete = ssip_rx_data_complete;
818 hsi_async_read(cl, msg);
819
820 return;
821out2:
822 dev_kfree_skb(skb);
823out1:
824 ssip_error(cl);
825}
826
827static void ssip_rxcmd_complete(struct hsi_msg *msg)
828{
829 struct hsi_client *cl = msg->cl;
830 u32 cmd = ssip_get_cmd(msg);
831 unsigned int cmdid = SSIP_COMMAND(cmd);
832
833 if (msg->status == HSI_STATUS_ERROR) {
834 dev_err(&cl->device, "RX error detected\n");
835 ssip_release_cmd(msg);
836 ssip_error(cl);
837 return;
838 }
839 hsi_async_read(cl, msg);
840 dev_dbg(&cl->device, "RX cmd: 0x%08x\n", cmd);
841 switch (cmdid) {
842 case SSIP_SW_BREAK:
843
844 break;
845 case SSIP_BOOTINFO_REQ:
846 ssip_rx_bootinforeq(cl, cmd);
847 break;
848 case SSIP_BOOTINFO_RESP:
849 ssip_rx_bootinforesp(cl, cmd);
850 break;
851 case SSIP_WAKETEST_RESULT:
852 ssip_rx_waketest(cl, cmd);
853 break;
854 case SSIP_START_TRANS:
855 ssip_rx_strans(cl, cmd);
856 break;
857 case SSIP_READY:
858 ssip_rx_ready(cl);
859 break;
860 default:
861 dev_warn(&cl->device, "command 0x%08x not supported\n", cmd);
862 break;
863 }
864}
865
866static void ssip_swbreak_complete(struct hsi_msg *msg)
867{
868 struct hsi_client *cl = msg->cl;
869 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
870
871 ssip_release_cmd(msg);
872 spin_lock_bh(&ssi->lock);
873 if (list_empty(&ssi->txqueue)) {
874 if (atomic_read(&ssi->tx_usecnt)) {
875 ssip_set_txstate(ssi, SEND_READY);
876 } else {
877 ssip_set_txstate(ssi, SEND_IDLE);
878 hsi_stop_tx(cl);
879 }
880 spin_unlock_bh(&ssi->lock);
881 } else {
882 spin_unlock_bh(&ssi->lock);
883 ssip_xmit(cl);
884 }
885 netif_wake_queue(ssi->netdev);
886}
887
888static void ssip_tx_data_complete(struct hsi_msg *msg)
889{
890 struct hsi_client *cl = msg->cl;
891 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
892 struct hsi_msg *cmsg;
893
894 if (msg->status == HSI_STATUS_ERROR) {
895 dev_err(&cl->device, "TX data error\n");
896 ssip_error(cl);
897 goto out;
898 }
899 spin_lock_bh(&ssi->lock);
900 if (list_empty(&ssi->txqueue)) {
901 ssip_set_txstate(ssi, SENDING_SWBREAK);
902 spin_unlock_bh(&ssi->lock);
903 cmsg = ssip_claim_cmd(ssi);
904 ssip_set_cmd(cmsg, SSIP_SWBREAK_CMD);
905 cmsg->complete = ssip_swbreak_complete;
906 dev_dbg(&cl->device, "Send SWBREAK\n");
907 hsi_async_write(cl, cmsg);
908 } else {
909 spin_unlock_bh(&ssi->lock);
910 ssip_xmit(cl);
911 }
912out:
913 ssip_free_data(msg);
914}
915
916static void ssip_port_event(struct hsi_client *cl, unsigned long event)
917{
918 switch (event) {
919 case HSI_EVENT_START_RX:
920 ssip_start_rx(cl);
921 break;
922 case HSI_EVENT_STOP_RX:
923 ssip_stop_rx(cl);
924 break;
925 default:
926 return;
927 }
928}
929
930static int ssip_pn_open(struct net_device *dev)
931{
932 struct hsi_client *cl = to_hsi_client(dev->dev.parent);
933 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
934 int err;
935
936 err = hsi_claim_port(cl, 1);
937 if (err < 0) {
938 dev_err(&cl->device, "SSI port already claimed\n");
939 return err;
940 }
941 err = hsi_register_port_event(cl, ssip_port_event);
942 if (err < 0) {
943 dev_err(&cl->device, "Register HSI port event failed (%d)\n",
944 err);
945 return err;
946 }
947 dev_dbg(&cl->device, "Configuring SSI port\n");
948 hsi_setup(cl);
949
950 if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
951 ssi_waketest(cl, 1);
952
953 spin_lock_bh(&ssi->lock);
954 ssi->main_state = HANDSHAKE;
955 spin_unlock_bh(&ssi->lock);
956
957 ssip_send_bootinfo_req_cmd(cl);
958
959 return 0;
960}
961
962static int ssip_pn_stop(struct net_device *dev)
963{
964 struct hsi_client *cl = to_hsi_client(dev->dev.parent);
965
966 ssip_reset(cl);
967 hsi_unregister_port_event(cl);
968 hsi_release_port(cl);
969
970 return 0;
971}
972
973static void ssip_xmit_work(struct work_struct *work)
974{
975 struct ssi_protocol *ssi =
976 container_of(work, struct ssi_protocol, work);
977 struct hsi_client *cl = ssi->cl;
978
979 ssip_xmit(cl);
980}
981
982static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev)
983{
984 struct hsi_client *cl = to_hsi_client(dev->dev.parent);
985 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
986 struct hsi_msg *msg;
987
988 if ((skb->protocol != htons(ETH_P_PHONET)) ||
989 (skb->len < SSIP_MIN_PN_HDR))
990 goto drop;
991
992 if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3)))
993 goto inc_dropped;
994
995
996
997
998
999 if (skb_cow_head(skb, 0))
1000 goto drop;
1001
1002
1003 ((u16 *)skb->data)[2] = htons(((u16 *)skb->data)[2]);
1004
1005 msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC);
1006 if (!msg) {
1007 dev_dbg(&cl->device, "Dropping tx data: No memory\n");
1008 goto drop;
1009 }
1010 msg->complete = ssip_tx_data_complete;
1011
1012 spin_lock_bh(&ssi->lock);
1013 if (unlikely(ssi->main_state != ACTIVE)) {
1014 spin_unlock_bh(&ssi->lock);
1015 dev_dbg(&cl->device, "Dropping tx data: CMT is OFFLINE\n");
1016 goto drop2;
1017 }
1018 list_add_tail(&msg->link, &ssi->txqueue);
1019 ssi->txqueue_len++;
1020 if (dev->tx_queue_len < ssi->txqueue_len) {
1021 dev_info(&cl->device, "TX queue full %d\n", ssi->txqueue_len);
1022 netif_stop_queue(dev);
1023 }
1024 if (ssi->send_state == SEND_IDLE) {
1025 ssip_set_txstate(ssi, WAIT4READY);
1026 spin_unlock_bh(&ssi->lock);
1027 dev_dbg(&cl->device, "Start TX qlen %d\n", ssi->txqueue_len);
1028 hsi_start_tx(cl);
1029 } else if (ssi->send_state == SEND_READY) {
1030
1031 dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n",
1032 ssi->txqueue_len);
1033 spin_unlock_bh(&ssi->lock);
1034 schedule_work(&ssi->work);
1035 } else {
1036 spin_unlock_bh(&ssi->lock);
1037 }
1038 dev->stats.tx_packets++;
1039 dev->stats.tx_bytes += skb->len;
1040
1041 return 0;
1042drop2:
1043 hsi_free_msg(msg);
1044drop:
1045 dev_kfree_skb(skb);
1046inc_dropped:
1047 dev->stats.tx_dropped++;
1048
1049 return 0;
1050}
1051
1052
1053void ssip_reset_event(struct hsi_client *master)
1054{
1055 struct ssi_protocol *ssi = hsi_client_drvdata(master);
1056 dev_err(&ssi->cl->device, "CMT reset detected!\n");
1057 ssip_error(ssi->cl);
1058}
1059EXPORT_SYMBOL_GPL(ssip_reset_event);
1060
1061static const struct net_device_ops ssip_pn_ops = {
1062 .ndo_open = ssip_pn_open,
1063 .ndo_stop = ssip_pn_stop,
1064 .ndo_start_xmit = ssip_pn_xmit,
1065};
1066
1067static void ssip_pn_setup(struct net_device *dev)
1068{
1069 dev->features = 0;
1070 dev->netdev_ops = &ssip_pn_ops;
1071 dev->type = ARPHRD_PHONET;
1072 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1073 dev->mtu = SSIP_DEFAULT_MTU;
1074 dev->hard_header_len = 1;
1075 dev->dev_addr[0] = PN_MEDIA_SOS;
1076 dev->addr_len = 1;
1077 dev->tx_queue_len = SSIP_TXQUEUE_LEN;
1078
1079 dev->needs_free_netdev = true;
1080 dev->header_ops = &phonet_header_ops;
1081}
1082
1083static int ssi_protocol_probe(struct device *dev)
1084{
1085 static const char ifname[] = "phonet%d";
1086 struct hsi_client *cl = to_hsi_client(dev);
1087 struct ssi_protocol *ssi;
1088 int err;
1089
1090 ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
1091 if (!ssi)
1092 return -ENOMEM;
1093
1094 spin_lock_init(&ssi->lock);
1095 timer_setup(&ssi->rx_wd, ssip_rx_wd, TIMER_DEFERRABLE);
1096 timer_setup(&ssi->tx_wd, ssip_tx_wd, TIMER_DEFERRABLE);
1097 timer_setup(&ssi->keep_alive, ssip_keep_alive, 0);
1098 INIT_LIST_HEAD(&ssi->txqueue);
1099 INIT_LIST_HEAD(&ssi->cmdqueue);
1100 atomic_set(&ssi->tx_usecnt, 0);
1101 hsi_client_set_drvdata(cl, ssi);
1102 ssi->cl = cl;
1103 INIT_WORK(&ssi->work, ssip_xmit_work);
1104
1105 ssi->channel_id_cmd = hsi_get_channel_id_by_name(cl, "mcsaab-control");
1106 if (ssi->channel_id_cmd < 0) {
1107 err = ssi->channel_id_cmd;
1108 dev_err(dev, "Could not get cmd channel (%d)\n", err);
1109 goto out;
1110 }
1111
1112 ssi->channel_id_data = hsi_get_channel_id_by_name(cl, "mcsaab-data");
1113 if (ssi->channel_id_data < 0) {
1114 err = ssi->channel_id_data;
1115 dev_err(dev, "Could not get data channel (%d)\n", err);
1116 goto out;
1117 }
1118
1119 err = ssip_alloc_cmds(ssi);
1120 if (err < 0) {
1121 dev_err(dev, "No memory for commands\n");
1122 goto out;
1123 }
1124
1125 ssi->netdev = alloc_netdev(0, ifname, NET_NAME_UNKNOWN, ssip_pn_setup);
1126 if (!ssi->netdev) {
1127 dev_err(dev, "No memory for netdev\n");
1128 err = -ENOMEM;
1129 goto out1;
1130 }
1131
1132
1133 ssi->netdev->min_mtu = PHONET_MIN_MTU;
1134 ssi->netdev->max_mtu = SSIP_MAX_MTU;
1135
1136 SET_NETDEV_DEV(ssi->netdev, dev);
1137 netif_carrier_off(ssi->netdev);
1138 err = register_netdev(ssi->netdev);
1139 if (err < 0) {
1140 dev_err(dev, "Register netdev failed (%d)\n", err);
1141 goto out2;
1142 }
1143
1144 list_add(&ssi->link, &ssip_list);
1145
1146 dev_dbg(dev, "channel configuration: cmd=%d, data=%d\n",
1147 ssi->channel_id_cmd, ssi->channel_id_data);
1148
1149 return 0;
1150out2:
1151 free_netdev(ssi->netdev);
1152out1:
1153 ssip_free_cmds(ssi);
1154out:
1155 kfree(ssi);
1156
1157 return err;
1158}
1159
1160static int ssi_protocol_remove(struct device *dev)
1161{
1162 struct hsi_client *cl = to_hsi_client(dev);
1163 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
1164
1165 list_del(&ssi->link);
1166 unregister_netdev(ssi->netdev);
1167 ssip_free_cmds(ssi);
1168 hsi_client_set_drvdata(cl, NULL);
1169 kfree(ssi);
1170
1171 return 0;
1172}
1173
1174static struct hsi_client_driver ssip_driver = {
1175 .driver = {
1176 .name = "ssi-protocol",
1177 .owner = THIS_MODULE,
1178 .probe = ssi_protocol_probe,
1179 .remove = ssi_protocol_remove,
1180 },
1181};
1182
1183static int __init ssip_init(void)
1184{
1185 pr_info("SSI protocol aka McSAAB added\n");
1186
1187 return hsi_register_client_driver(&ssip_driver);
1188}
1189module_init(ssip_init);
1190
1191static void __exit ssip_exit(void)
1192{
1193 hsi_unregister_client_driver(&ssip_driver);
1194 pr_info("SSI protocol driver removed\n");
1195}
1196module_exit(ssip_exit);
1197
1198MODULE_ALIAS("hsi:ssi-protocol");
1199MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
1200MODULE_AUTHOR("Remi Denis-Courmont <remi.denis-courmont@nokia.com>");
1201MODULE_DESCRIPTION("SSI protocol improved aka McSAAB");
1202MODULE_LICENSE("GPL");
1203
