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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(unsigned long data)
468{
469 struct hsi_client *cl = (struct hsi_client *)data;
470 struct ssi_protocol *ssi = hsi_client_drvdata(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_wd(unsigned long data)
494{
495 struct hsi_client *cl = (struct hsi_client *)data;
496
497 dev_err(&cl->device, "Watchdog trigerred\n");
498 ssip_error(cl);
499}
500
501static void ssip_send_bootinfo_req_cmd(struct hsi_client *cl)
502{
503 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
504 struct hsi_msg *msg;
505
506 dev_dbg(&cl->device, "Issuing BOOT INFO REQ command\n");
507 msg = ssip_claim_cmd(ssi);
508 ssip_set_cmd(msg, SSIP_BOOTINFO_REQ_CMD(SSIP_LOCAL_VERID));
509 msg->complete = ssip_release_cmd;
510 hsi_async_write(cl, msg);
511 dev_dbg(&cl->device, "Issuing RX command\n");
512 msg = ssip_claim_cmd(ssi);
513 msg->complete = ssip_rxcmd_complete;
514 hsi_async_read(cl, msg);
515}
516
517static void ssip_start_rx(struct hsi_client *cl)
518{
519 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
520 struct hsi_msg *msg;
521
522 dev_dbg(&cl->device, "RX start M(%d) R(%d)\n", ssi->main_state,
523 ssi->recv_state);
524 spin_lock_bh(&ssi->lock);
525
526
527
528
529 if ((ssi->main_state != ACTIVE) || (ssi->recv_state == RECV_READY)) {
530 spin_unlock_bh(&ssi->lock);
531 return;
532 }
533 ssip_set_rxstate(ssi, RECV_READY);
534 spin_unlock_bh(&ssi->lock);
535
536 msg = ssip_claim_cmd(ssi);
537 ssip_set_cmd(msg, SSIP_READY_CMD);
538 msg->complete = ssip_release_cmd;
539 dev_dbg(&cl->device, "Send READY\n");
540 hsi_async_write(cl, msg);
541}
542
543static void ssip_stop_rx(struct hsi_client *cl)
544{
545 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
546
547 dev_dbg(&cl->device, "RX stop M(%d)\n", ssi->main_state);
548 spin_lock_bh(&ssi->lock);
549 if (likely(ssi->main_state == ACTIVE))
550 ssip_set_rxstate(ssi, RECV_IDLE);
551 spin_unlock_bh(&ssi->lock);
552}
553
554static void ssip_free_strans(struct hsi_msg *msg)
555{
556 ssip_free_data(msg->context);
557 ssip_release_cmd(msg);
558}
559
560static void ssip_strans_complete(struct hsi_msg *msg)
561{
562 struct hsi_client *cl = msg->cl;
563 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
564 struct hsi_msg *data;
565
566 data = msg->context;
567 ssip_release_cmd(msg);
568 spin_lock_bh(&ssi->lock);
569 ssip_set_txstate(ssi, SENDING);
570 spin_unlock_bh(&ssi->lock);
571 hsi_async_write(cl, data);
572}
573
574static int ssip_xmit(struct hsi_client *cl)
575{
576 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
577 struct hsi_msg *msg, *dmsg;
578 struct sk_buff *skb;
579
580 spin_lock_bh(&ssi->lock);
581 if (list_empty(&ssi->txqueue)) {
582 spin_unlock_bh(&ssi->lock);
583 return 0;
584 }
585 dmsg = list_first_entry(&ssi->txqueue, struct hsi_msg, link);
586 list_del(&dmsg->link);
587 ssi->txqueue_len--;
588 spin_unlock_bh(&ssi->lock);
589
590 msg = ssip_claim_cmd(ssi);
591 skb = dmsg->context;
592 msg->context = dmsg;
593 msg->complete = ssip_strans_complete;
594 msg->destructor = ssip_free_strans;
595
596 spin_lock_bh(&ssi->lock);
597 ssip_set_cmd(msg, SSIP_START_TRANS_CMD(SSIP_BYTES_TO_FRAMES(skb->len),
598 ssi->txid));
599 ssi->txid++;
600 ssip_set_txstate(ssi, SENDING);
601 spin_unlock_bh(&ssi->lock);
602
603 dev_dbg(&cl->device, "Send STRANS (%d frames)\n",
604 SSIP_BYTES_TO_FRAMES(skb->len));
605
606 return hsi_async_write(cl, msg);
607}
608
609
610static void ssip_pn_rx(struct sk_buff *skb)
611{
612 struct net_device *dev = skb->dev;
613
614 if (unlikely(!netif_running(dev))) {
615 dev_dbg(&dev->dev, "Drop RX packet\n");
616 dev->stats.rx_dropped++;
617 dev_kfree_skb(skb);
618 return;
619 }
620 if (unlikely(!pskb_may_pull(skb, SSIP_MIN_PN_HDR))) {
621 dev_dbg(&dev->dev, "Error drop RX packet\n");
622 dev->stats.rx_errors++;
623 dev->stats.rx_length_errors++;
624 dev_kfree_skb(skb);
625 return;
626 }
627 dev->stats.rx_packets++;
628 dev->stats.rx_bytes += skb->len;
629
630
631 ((u16 *)skb->data)[2] = ntohs(((u16 *)skb->data)[2]);
632 dev_dbg(&dev->dev, "RX length fixed (%04x -> %u)\n",
633 ((u16 *)skb->data)[2], ntohs(((u16 *)skb->data)[2]));
634
635 skb->protocol = htons(ETH_P_PHONET);
636 skb_reset_mac_header(skb);
637 __skb_pull(skb, 1);
638 netif_rx(skb);
639}
640
641static void ssip_rx_data_complete(struct hsi_msg *msg)
642{
643 struct hsi_client *cl = msg->cl;
644 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
645 struct sk_buff *skb;
646
647 if (msg->status == HSI_STATUS_ERROR) {
648 dev_err(&cl->device, "RX data error\n");
649 ssip_free_data(msg);
650 ssip_error(cl);
651 return;
652 }
653 del_timer(&ssi->rx_wd);
654 skb = msg->context;
655 ssip_pn_rx(skb);
656 hsi_free_msg(msg);
657}
658
659static void ssip_rx_bootinforeq(struct hsi_client *cl, u32 cmd)
660{
661 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
662 struct hsi_msg *msg;
663
664
665 if (cmd == SSIP_CMT_LOADER_SYNC)
666 return;
667
668 switch (ssi->main_state) {
669 case ACTIVE:
670 dev_err(&cl->device, "Boot info req on active state\n");
671 ssip_error(cl);
672
673 case INIT:
674 case HANDSHAKE:
675 spin_lock_bh(&ssi->lock);
676 ssi->main_state = HANDSHAKE;
677 spin_unlock_bh(&ssi->lock);
678
679 if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
680 ssi_waketest(cl, 1);
681
682 spin_lock_bh(&ssi->lock);
683
684 mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
685 spin_unlock_bh(&ssi->lock);
686 dev_dbg(&cl->device, "Send BOOTINFO_RESP\n");
687 if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID)
688 dev_warn(&cl->device, "boot info req verid mismatch\n");
689 msg = ssip_claim_cmd(ssi);
690 ssip_set_cmd(msg, SSIP_BOOTINFO_RESP_CMD(SSIP_LOCAL_VERID));
691 msg->complete = ssip_release_cmd;
692 hsi_async_write(cl, msg);
693 break;
694 default:
695 dev_dbg(&cl->device, "Wrong state M(%d)\n", ssi->main_state);
696 break;
697 }
698}
699
700static void ssip_rx_bootinforesp(struct hsi_client *cl, u32 cmd)
701{
702 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
703
704 if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID)
705 dev_warn(&cl->device, "boot info resp verid mismatch\n");
706
707 spin_lock_bh(&ssi->lock);
708 if (ssi->main_state != ACTIVE)
709
710 mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
711 else
712 dev_dbg(&cl->device, "boot info resp ignored M(%d)\n",
713 ssi->main_state);
714 spin_unlock_bh(&ssi->lock);
715}
716
717static void ssip_rx_waketest(struct hsi_client *cl, u32 cmd)
718{
719 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
720 unsigned int wkres = SSIP_PAYLOAD(cmd);
721
722 spin_lock_bh(&ssi->lock);
723 if (ssi->main_state != HANDSHAKE) {
724 dev_dbg(&cl->device, "wake lines test ignored M(%d)\n",
725 ssi->main_state);
726 spin_unlock_bh(&ssi->lock);
727 return;
728 }
729 spin_unlock_bh(&ssi->lock);
730
731 if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
732 ssi_waketest(cl, 0);
733
734 spin_lock_bh(&ssi->lock);
735 ssi->main_state = ACTIVE;
736 del_timer(&ssi->tx_wd);
737 spin_unlock_bh(&ssi->lock);
738
739 dev_notice(&cl->device, "WAKELINES TEST %s\n",
740 wkres & SSIP_WAKETEST_FAILED ? "FAILED" : "OK");
741 if (wkres & SSIP_WAKETEST_FAILED) {
742 ssip_error(cl);
743 return;
744 }
745 dev_dbg(&cl->device, "CMT is ONLINE\n");
746 netif_wake_queue(ssi->netdev);
747 netif_carrier_on(ssi->netdev);
748}
749
750static void ssip_rx_ready(struct hsi_client *cl)
751{
752 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
753
754 spin_lock_bh(&ssi->lock);
755 if (unlikely(ssi->main_state != ACTIVE)) {
756 dev_dbg(&cl->device, "READY on wrong state: S(%d) M(%d)\n",
757 ssi->send_state, ssi->main_state);
758 spin_unlock_bh(&ssi->lock);
759 return;
760 }
761 if (ssi->send_state != WAIT4READY) {
762 dev_dbg(&cl->device, "Ignore spurious READY command\n");
763 spin_unlock_bh(&ssi->lock);
764 return;
765 }
766 ssip_set_txstate(ssi, SEND_READY);
767 spin_unlock_bh(&ssi->lock);
768 ssip_xmit(cl);
769}
770
771static void ssip_rx_strans(struct hsi_client *cl, u32 cmd)
772{
773 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
774 struct sk_buff *skb;
775 struct hsi_msg *msg;
776 int len = SSIP_PDU_LENGTH(cmd);
777
778 dev_dbg(&cl->device, "RX strans: %d frames\n", len);
779 spin_lock_bh(&ssi->lock);
780 if (unlikely(ssi->main_state != ACTIVE)) {
781 dev_err(&cl->device, "START TRANS wrong state: S(%d) M(%d)\n",
782 ssi->send_state, ssi->main_state);
783 spin_unlock_bh(&ssi->lock);
784 return;
785 }
786 ssip_set_rxstate(ssi, RECEIVING);
787 if (unlikely(SSIP_MSG_ID(cmd) != ssi->rxid)) {
788 dev_err(&cl->device, "START TRANS id %d expected %d\n",
789 SSIP_MSG_ID(cmd), ssi->rxid);
790 spin_unlock_bh(&ssi->lock);
791 goto out1;
792 }
793 ssi->rxid++;
794 spin_unlock_bh(&ssi->lock);
795 skb = netdev_alloc_skb(ssi->netdev, len * 4);
796 if (unlikely(!skb)) {
797 dev_err(&cl->device, "No memory for rx skb\n");
798 goto out1;
799 }
800 skb->dev = ssi->netdev;
801 skb_put(skb, len * 4);
802 msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC);
803 if (unlikely(!msg)) {
804 dev_err(&cl->device, "No memory for RX data msg\n");
805 goto out2;
806 }
807 msg->complete = ssip_rx_data_complete;
808 hsi_async_read(cl, msg);
809
810 return;
811out2:
812 dev_kfree_skb(skb);
813out1:
814 ssip_error(cl);
815}
816
817static void ssip_rxcmd_complete(struct hsi_msg *msg)
818{
819 struct hsi_client *cl = msg->cl;
820 u32 cmd = ssip_get_cmd(msg);
821 unsigned int cmdid = SSIP_COMMAND(cmd);
822
823 if (msg->status == HSI_STATUS_ERROR) {
824 dev_err(&cl->device, "RX error detected\n");
825 ssip_release_cmd(msg);
826 ssip_error(cl);
827 return;
828 }
829 hsi_async_read(cl, msg);
830 dev_dbg(&cl->device, "RX cmd: 0x%08x\n", cmd);
831 switch (cmdid) {
832 case SSIP_SW_BREAK:
833
834 break;
835 case SSIP_BOOTINFO_REQ:
836 ssip_rx_bootinforeq(cl, cmd);
837 break;
838 case SSIP_BOOTINFO_RESP:
839 ssip_rx_bootinforesp(cl, cmd);
840 break;
841 case SSIP_WAKETEST_RESULT:
842 ssip_rx_waketest(cl, cmd);
843 break;
844 case SSIP_START_TRANS:
845 ssip_rx_strans(cl, cmd);
846 break;
847 case SSIP_READY:
848 ssip_rx_ready(cl);
849 break;
850 default:
851 dev_warn(&cl->device, "command 0x%08x not supported\n", cmd);
852 break;
853 }
854}
855
856static void ssip_swbreak_complete(struct hsi_msg *msg)
857{
858 struct hsi_client *cl = msg->cl;
859 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
860
861 ssip_release_cmd(msg);
862 spin_lock_bh(&ssi->lock);
863 if (list_empty(&ssi->txqueue)) {
864 if (atomic_read(&ssi->tx_usecnt)) {
865 ssip_set_txstate(ssi, SEND_READY);
866 } else {
867 ssip_set_txstate(ssi, SEND_IDLE);
868 hsi_stop_tx(cl);
869 }
870 spin_unlock_bh(&ssi->lock);
871 } else {
872 spin_unlock_bh(&ssi->lock);
873 ssip_xmit(cl);
874 }
875 netif_wake_queue(ssi->netdev);
876}
877
878static void ssip_tx_data_complete(struct hsi_msg *msg)
879{
880 struct hsi_client *cl = msg->cl;
881 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
882 struct hsi_msg *cmsg;
883
884 if (msg->status == HSI_STATUS_ERROR) {
885 dev_err(&cl->device, "TX data error\n");
886 ssip_error(cl);
887 goto out;
888 }
889 spin_lock_bh(&ssi->lock);
890 if (list_empty(&ssi->txqueue)) {
891 ssip_set_txstate(ssi, SENDING_SWBREAK);
892 spin_unlock_bh(&ssi->lock);
893 cmsg = ssip_claim_cmd(ssi);
894 ssip_set_cmd(cmsg, SSIP_SWBREAK_CMD);
895 cmsg->complete = ssip_swbreak_complete;
896 dev_dbg(&cl->device, "Send SWBREAK\n");
897 hsi_async_write(cl, cmsg);
898 } else {
899 spin_unlock_bh(&ssi->lock);
900 ssip_xmit(cl);
901 }
902out:
903 ssip_free_data(msg);
904}
905
906static void ssip_port_event(struct hsi_client *cl, unsigned long event)
907{
908 switch (event) {
909 case HSI_EVENT_START_RX:
910 ssip_start_rx(cl);
911 break;
912 case HSI_EVENT_STOP_RX:
913 ssip_stop_rx(cl);
914 break;
915 default:
916 return;
917 }
918}
919
920static int ssip_pn_open(struct net_device *dev)
921{
922 struct hsi_client *cl = to_hsi_client(dev->dev.parent);
923 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
924 int err;
925
926 err = hsi_claim_port(cl, 1);
927 if (err < 0) {
928 dev_err(&cl->device, "SSI port already claimed\n");
929 return err;
930 }
931 err = hsi_register_port_event(cl, ssip_port_event);
932 if (err < 0) {
933 dev_err(&cl->device, "Register HSI port event failed (%d)\n",
934 err);
935 return err;
936 }
937 dev_dbg(&cl->device, "Configuring SSI port\n");
938 hsi_setup(cl);
939
940 if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
941 ssi_waketest(cl, 1);
942
943 spin_lock_bh(&ssi->lock);
944 ssi->main_state = HANDSHAKE;
945 spin_unlock_bh(&ssi->lock);
946
947 ssip_send_bootinfo_req_cmd(cl);
948
949 return 0;
950}
951
952static int ssip_pn_stop(struct net_device *dev)
953{
954 struct hsi_client *cl = to_hsi_client(dev->dev.parent);
955
956 ssip_reset(cl);
957 hsi_unregister_port_event(cl);
958 hsi_release_port(cl);
959
960 return 0;
961}
962
963static void ssip_xmit_work(struct work_struct *work)
964{
965 struct ssi_protocol *ssi =
966 container_of(work, struct ssi_protocol, work);
967 struct hsi_client *cl = ssi->cl;
968
969 ssip_xmit(cl);
970}
971
972static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev)
973{
974 struct hsi_client *cl = to_hsi_client(dev->dev.parent);
975 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
976 struct hsi_msg *msg;
977
978 if ((skb->protocol != htons(ETH_P_PHONET)) ||
979 (skb->len < SSIP_MIN_PN_HDR))
980 goto drop;
981
982 if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3)))
983 goto inc_dropped;
984
985
986
987
988
989 if (skb_cow_head(skb, 0))
990 goto drop;
991
992
993 ((u16 *)skb->data)[2] = htons(((u16 *)skb->data)[2]);
994
995 msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC);
996 if (!msg) {
997 dev_dbg(&cl->device, "Dropping tx data: No memory\n");
998 goto drop;
999 }
1000 msg->complete = ssip_tx_data_complete;
1001
1002 spin_lock_bh(&ssi->lock);
1003 if (unlikely(ssi->main_state != ACTIVE)) {
1004 spin_unlock_bh(&ssi->lock);
1005 dev_dbg(&cl->device, "Dropping tx data: CMT is OFFLINE\n");
1006 goto drop2;
1007 }
1008 list_add_tail(&msg->link, &ssi->txqueue);
1009 ssi->txqueue_len++;
1010 if (dev->tx_queue_len < ssi->txqueue_len) {
1011 dev_info(&cl->device, "TX queue full %d\n", ssi->txqueue_len);
1012 netif_stop_queue(dev);
1013 }
1014 if (ssi->send_state == SEND_IDLE) {
1015 ssip_set_txstate(ssi, WAIT4READY);
1016 spin_unlock_bh(&ssi->lock);
1017 dev_dbg(&cl->device, "Start TX qlen %d\n", ssi->txqueue_len);
1018 hsi_start_tx(cl);
1019 } else if (ssi->send_state == SEND_READY) {
1020
1021 dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n",
1022 ssi->txqueue_len);
1023 spin_unlock_bh(&ssi->lock);
1024 schedule_work(&ssi->work);
1025 } else {
1026 spin_unlock_bh(&ssi->lock);
1027 }
1028 dev->stats.tx_packets++;
1029 dev->stats.tx_bytes += skb->len;
1030
1031 return 0;
1032drop2:
1033 hsi_free_msg(msg);
1034drop:
1035 dev_kfree_skb(skb);
1036inc_dropped:
1037 dev->stats.tx_dropped++;
1038
1039 return 0;
1040}
1041
1042
1043void ssip_reset_event(struct hsi_client *master)
1044{
1045 struct ssi_protocol *ssi = hsi_client_drvdata(master);
1046 dev_err(&ssi->cl->device, "CMT reset detected!\n");
1047 ssip_error(ssi->cl);
1048}
1049EXPORT_SYMBOL_GPL(ssip_reset_event);
1050
1051static const struct net_device_ops ssip_pn_ops = {
1052 .ndo_open = ssip_pn_open,
1053 .ndo_stop = ssip_pn_stop,
1054 .ndo_start_xmit = ssip_pn_xmit,
1055};
1056
1057static void ssip_pn_setup(struct net_device *dev)
1058{
1059 dev->features = 0;
1060 dev->netdev_ops = &ssip_pn_ops;
1061 dev->type = ARPHRD_PHONET;
1062 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1063 dev->mtu = SSIP_DEFAULT_MTU;
1064 dev->hard_header_len = 1;
1065 dev->dev_addr[0] = PN_MEDIA_SOS;
1066 dev->addr_len = 1;
1067 dev->tx_queue_len = SSIP_TXQUEUE_LEN;
1068
1069 dev->needs_free_netdev = true;
1070 dev->header_ops = &phonet_header_ops;
1071}
1072
1073static int ssi_protocol_probe(struct device *dev)
1074{
1075 static const char ifname[] = "phonet%d";
1076 struct hsi_client *cl = to_hsi_client(dev);
1077 struct ssi_protocol *ssi;
1078 int err;
1079
1080 ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
1081 if (!ssi) {
1082 dev_err(dev, "No memory for ssi protocol\n");
1083 return -ENOMEM;
1084 }
1085
1086 spin_lock_init(&ssi->lock);
1087 init_timer_deferrable(&ssi->rx_wd);
1088 init_timer_deferrable(&ssi->tx_wd);
1089 init_timer(&ssi->keep_alive);
1090 ssi->rx_wd.data = (unsigned long)cl;
1091 ssi->rx_wd.function = ssip_wd;
1092 ssi->tx_wd.data = (unsigned long)cl;
1093 ssi->tx_wd.function = ssip_wd;
1094 ssi->keep_alive.data = (unsigned long)cl;
1095 ssi->keep_alive.function = ssip_keep_alive;
1096 INIT_LIST_HEAD(&ssi->txqueue);
1097 INIT_LIST_HEAD(&ssi->cmdqueue);
1098 atomic_set(&ssi->tx_usecnt, 0);
1099 hsi_client_set_drvdata(cl, ssi);
1100 ssi->cl = cl;
1101 INIT_WORK(&ssi->work, ssip_xmit_work);
1102
1103 ssi->channel_id_cmd = hsi_get_channel_id_by_name(cl, "mcsaab-control");
1104 if (ssi->channel_id_cmd < 0) {
1105 err = ssi->channel_id_cmd;
1106 dev_err(dev, "Could not get cmd channel (%d)\n", err);
1107 goto out;
1108 }
1109
1110 ssi->channel_id_data = hsi_get_channel_id_by_name(cl, "mcsaab-data");
1111 if (ssi->channel_id_data < 0) {
1112 err = ssi->channel_id_data;
1113 dev_err(dev, "Could not get data channel (%d)\n", err);
1114 goto out;
1115 }
1116
1117 err = ssip_alloc_cmds(ssi);
1118 if (err < 0) {
1119 dev_err(dev, "No memory for commands\n");
1120 goto out;
1121 }
1122
1123 ssi->netdev = alloc_netdev(0, ifname, NET_NAME_UNKNOWN, ssip_pn_setup);
1124 if (!ssi->netdev) {
1125 dev_err(dev, "No memory for netdev\n");
1126 err = -ENOMEM;
1127 goto out1;
1128 }
1129
1130
1131 ssi->netdev->min_mtu = PHONET_MIN_MTU;
1132 ssi->netdev->max_mtu = SSIP_MAX_MTU;
1133
1134 SET_NETDEV_DEV(ssi->netdev, dev);
1135 netif_carrier_off(ssi->netdev);
1136 err = register_netdev(ssi->netdev);
1137 if (err < 0) {
1138 dev_err(dev, "Register netdev failed (%d)\n", err);
1139 goto out2;
1140 }
1141
1142 list_add(&ssi->link, &ssip_list);
1143
1144 dev_dbg(dev, "channel configuration: cmd=%d, data=%d\n",
1145 ssi->channel_id_cmd, ssi->channel_id_data);
1146
1147 return 0;
1148out2:
1149 free_netdev(ssi->netdev);
1150out1:
1151 ssip_free_cmds(ssi);
1152out:
1153 kfree(ssi);
1154
1155 return err;
1156}
1157
1158static int ssi_protocol_remove(struct device *dev)
1159{
1160 struct hsi_client *cl = to_hsi_client(dev);
1161 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
1162
1163 list_del(&ssi->link);
1164 unregister_netdev(ssi->netdev);
1165 ssip_free_cmds(ssi);
1166 hsi_client_set_drvdata(cl, NULL);
1167 kfree(ssi);
1168
1169 return 0;
1170}
1171
1172static struct hsi_client_driver ssip_driver = {
1173 .driver = {
1174 .name = "ssi-protocol",
1175 .owner = THIS_MODULE,
1176 .probe = ssi_protocol_probe,
1177 .remove = ssi_protocol_remove,
1178 },
1179};
1180
1181static int __init ssip_init(void)
1182{
1183 pr_info("SSI protocol aka McSAAB added\n");
1184
1185 return hsi_register_client_driver(&ssip_driver);
1186}
1187module_init(ssip_init);
1188
1189static void __exit ssip_exit(void)
1190{
1191 hsi_unregister_client_driver(&ssip_driver);
1192 pr_info("SSI protocol driver removed\n");
1193}
1194module_exit(ssip_exit);
1195
1196MODULE_ALIAS("hsi:ssi-protocol");
1197MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
1198MODULE_AUTHOR("Remi Denis-Courmont <remi.denis-courmont@nokia.com>");
1199MODULE_DESCRIPTION("SSI protocol improved aka McSAAB");
1200MODULE_LICENSE("GPL");
1201
