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mm/slub.c: fix random_seq offset destruction
[linux/fpc-iii.git] / drivers / hsi / clients / ssi_protocol.c
blob6031cd1465565b35d8832d445ad15fc60b4c37ee
1 /*
2 * ssi_protocol.c
3 *
4 * Implementation of the SSI McSAAB improved protocol.
5 *
6 * Copyright (C) 2010 Nokia Corporation. All rights reserved.
7 * Copyright (C) 2013 Sebastian Reichel <sre@kernel.org>
8 *
9 * Contact: Carlos Chinea <carlos.chinea@nokia.com>
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * version 2 as published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
23 * 02110-1301 USA
24 */
25
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
48 void 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 /* FIXME: Revisit */
55 #define SSIP_WDTOUT 2000 /* FIXME: has to be 500 msecs */
56 #define SSIP_KATOUT 15 /* 15 msecs */
57 #define SSIP_MAX_CMDS 5 /* Number of pre-allocated commands buffers */
58 #define SSIP_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
59 #define SSIP_CMT_LOADER_SYNC 0x11223344
60 /*
61 * SSI protocol command definitions
62 */
63 #define SSIP_COMMAND(data) ((data) >> 28)
64 #define SSIP_PAYLOAD(data) ((data) & 0xfffffff)
65 /* Commands */
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 /* Payloads */
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 /* Generic Command */
80 #define SSIP_CMD(cmd, payload) (((cmd) << 28) | ((payload) & 0xfffffff))
81 /* Commands for the control channel */
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 /* Main state machine states */
94 enum {
95 INIT,
96 HANDSHAKE,
97 ACTIVE,
98 };
99
100 /* Send state machine states */
101 enum {
102 SEND_IDLE,
103 WAIT4READY,
104 SEND_READY,
105 SENDING,
106 SENDING_SWBREAK,
107 };
108
109 /* Receive state machine states */
110 enum {
111 RECV_IDLE,
112 RECV_READY,
113 RECEIVING,
114 };
115
116 /**
117 * struct ssi_protocol - SSI protocol (McSAAB) data
118 * @main_state: Main state machine
119 * @send_state: TX state machine
120 * @recv_state: RX state machine
121 * @flags: Flags, currently only used to follow wake line test
122 * @rxid: RX data id
123 * @txid: TX data id
124 * @txqueue_len: TX queue length
125 * @tx_wd: TX watchdog
126 * @rx_wd: RX watchdog
127 * @keep_alive: Workaround for SSI HW bug
128 * @lock: To serialize access to this struct
129 * @netdev: Phonet network device
130 * @txqueue: TX data queue
131 * @cmdqueue: Queue of free commands
132 * @cl: HSI client own reference
133 * @link: Link for ssip_list
134 * @tx_usecount: Refcount to keep track the slaves that use the wake line
135 * @channel_id_cmd: HSI channel id for command stream
136 * @channel_id_data: HSI channel id for data stream
137 */
138 struct 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; /* wake-up workaround */
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 /* List of ssi protocol instances */
162 static LIST_HEAD(ssip_list);
163
164 static void ssip_rxcmd_complete(struct hsi_msg *msg);
165
166 static 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
174 static 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
183 static 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
201 static 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
213 static 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
229 static 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
239 static 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
254 static 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
266 static 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;
287 out:
288 ssip_free_cmds(ssi);
289
290 return -ENOMEM;
291 }
292
293 static 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 /* CMT speech workaround */
304 if (atomic_read(&ssi->tx_usecnt))
305 break;
306 /* Otherwise fall through */
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
317 static 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
339 struct 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 }
352 EXPORT_SYMBOL_GPL(ssip_slave_get_master);
353
354 int 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 }
369 EXPORT_SYMBOL_GPL(ssip_slave_start_tx);
370
371 int 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 }
390 EXPORT_SYMBOL_GPL(ssip_slave_stop_tx);
391
392 int ssip_slave_running(struct hsi_client *master)
393 {
394 struct ssi_protocol *ssi = hsi_client_drvdata(master);
395 return netif_running(ssi->netdev);
396 }
397 EXPORT_SYMBOL_GPL(ssip_slave_running);
398
399 static 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); /* FIXME: To be removed */
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
434 static 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
455 static 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
467 static 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 * Fall through. Workaround for cmt-speech
483 * in that case we relay on audio timers.
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
493 static 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
501 static 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
517 static 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 * We can have two UP events in a row due to a short low
527 * high transition. Therefore we need to ignore the sencond UP event.
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
543 static 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
554 static void ssip_free_strans(struct hsi_msg *msg)
555 {
556 ssip_free_data(msg->context);
557 ssip_release_cmd(msg);
558 }
559
560 static 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
574 static 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 /* In soft IRQ context */
610 static 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 /* length field is exchanged in network byte order */
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
641 static 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); /* FIXME: Revisit */
654 skb = msg->context;
655 ssip_pn_rx(skb);
656 hsi_free_msg(msg);
657 }
658
659 static 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 /* Workaroud: Ignore CMT Loader message leftover */
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 /* Fall through */
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); /* FIXME: To be removed */
681
682 spin_lock_bh(&ssi->lock);
683 /* Start boot handshake watchdog */
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
700 static 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 /* Use tx_wd as a boot watchdog in non ACTIVE state */
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
717 static 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); /* FIXME: To be removed */
733
734 spin_lock_bh(&ssi->lock);
735 ssi->main_state = ACTIVE;
736 del_timer(&ssi->tx_wd); /* Stop boot handshake timer */
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
750 static 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
771 static 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;
811 out2:
812 dev_kfree_skb(skb);
813 out1:
814 ssip_error(cl);
815 }
816
817 static 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 /* Ignored */
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
856 static 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
878 static 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 }
902 out:
903 ssip_free_data(msg);
904 }
905
906 static 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
920 static 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); /* FIXME: To be removed */
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
952 static 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
963 static int ssip_pn_set_mtu(struct net_device *dev, int new_mtu)
964 {
965 if (new_mtu > SSIP_MAX_MTU || new_mtu < PHONET_MIN_MTU)
966 return -EINVAL;
967 dev->mtu = new_mtu;
968
969 return 0;
970 }
971
972 static void ssip_xmit_work(struct work_struct *work)
973 {
974 struct ssi_protocol *ssi =
975 container_of(work, struct ssi_protocol, work);
976 struct hsi_client *cl = ssi->cl;
977
978 ssip_xmit(cl);
979 }
980
981 static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev)
982 {
983 struct hsi_client *cl = to_hsi_client(dev->dev.parent);
984 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
985 struct hsi_msg *msg;
986
987 if ((skb->protocol != htons(ETH_P_PHONET)) ||
988 (skb->len < SSIP_MIN_PN_HDR))
989 goto drop;
990 /* Pad to 32-bits - FIXME: Revisit*/
991 if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3)))
992 goto drop;
993
994 /*
995 * Modem sends Phonet messages over SSI with its own endianess...
996 * Assume that modem has the same endianess as we do.
997 */
998 if (skb_cow_head(skb, 0))
999 goto drop;
1000
1001 /* length field is exchanged in network byte order */
1002 ((u16 *)skb->data)[2] = htons(((u16 *)skb->data)[2]);
1003
1004 msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC);
1005 if (!msg) {
1006 dev_dbg(&cl->device, "Dropping tx data: No memory\n");
1007 goto drop;
1008 }
1009 msg->complete = ssip_tx_data_complete;
1010
1011 spin_lock_bh(&ssi->lock);
1012 if (unlikely(ssi->main_state != ACTIVE)) {
1013 spin_unlock_bh(&ssi->lock);
1014 dev_dbg(&cl->device, "Dropping tx data: CMT is OFFLINE\n");
1015 goto drop2;
1016 }
1017 list_add_tail(&msg->link, &ssi->txqueue);
1018 ssi->txqueue_len++;
1019 if (dev->tx_queue_len < ssi->txqueue_len) {
1020 dev_info(&cl->device, "TX queue full %d\n", ssi->txqueue_len);
1021 netif_stop_queue(dev);
1022 }
1023 if (ssi->send_state == SEND_IDLE) {
1024 ssip_set_txstate(ssi, WAIT4READY);
1025 spin_unlock_bh(&ssi->lock);
1026 dev_dbg(&cl->device, "Start TX qlen %d\n", ssi->txqueue_len);
1027 hsi_start_tx(cl);
1028 } else if (ssi->send_state == SEND_READY) {
1029 /* Needed for cmt-speech workaround */
1030 dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n",
1031 ssi->txqueue_len);
1032 spin_unlock_bh(&ssi->lock);
1033 schedule_work(&ssi->work);
1034 } else {
1035 spin_unlock_bh(&ssi->lock);
1036 }
1037 dev->stats.tx_packets++;
1038 dev->stats.tx_bytes += skb->len;
1039
1040 return 0;
1041 drop2:
1042 hsi_free_msg(msg);
1043 drop:
1044 dev->stats.tx_dropped++;
1045 dev_kfree_skb(skb);
1046
1047 return 0;
1048 }
1049
1050 /* CMT reset event handler */
1051 void ssip_reset_event(struct hsi_client *master)
1052 {
1053 struct ssi_protocol *ssi = hsi_client_drvdata(master);
1054 dev_err(&ssi->cl->device, "CMT reset detected!\n");
1055 ssip_error(ssi->cl);
1056 }
1057 EXPORT_SYMBOL_GPL(ssip_reset_event);
1058
1059 static const struct net_device_ops ssip_pn_ops = {
1060 .ndo_open = ssip_pn_open,
1061 .ndo_stop = ssip_pn_stop,
1062 .ndo_start_xmit = ssip_pn_xmit,
1063 .ndo_change_mtu = ssip_pn_set_mtu,
1064 };
1065
1066 static void ssip_pn_setup(struct net_device *dev)
1067 {
1068 dev->features = 0;
1069 dev->netdev_ops = &ssip_pn_ops;
1070 dev->type = ARPHRD_PHONET;
1071 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1072 dev->mtu = SSIP_DEFAULT_MTU;
1073 dev->hard_header_len = 1;
1074 dev->dev_addr[0] = PN_MEDIA_SOS;
1075 dev->addr_len = 1;
1076 dev->tx_queue_len = SSIP_TXQUEUE_LEN;
1077
1078 dev->destructor = free_netdev;
1079 dev->header_ops = &phonet_header_ops;
1080 }
1081
1082 static int ssi_protocol_probe(struct device *dev)
1083 {
1084 static const char ifname[] = "phonet%d";
1085 struct hsi_client *cl = to_hsi_client(dev);
1086 struct ssi_protocol *ssi;
1087 int err;
1088
1089 ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
1090 if (!ssi) {
1091 dev_err(dev, "No memory for ssi protocol\n");
1092 return -ENOMEM;
1093 }
1094
1095 spin_lock_init(&ssi->lock);
1096 init_timer_deferrable(&ssi->rx_wd);
1097 init_timer_deferrable(&ssi->tx_wd);
1098 init_timer(&ssi->keep_alive);
1099 ssi->rx_wd.data = (unsigned long)cl;
1100 ssi->rx_wd.function = ssip_wd;
1101 ssi->tx_wd.data = (unsigned long)cl;
1102 ssi->tx_wd.function = ssip_wd;
1103 ssi->keep_alive.data = (unsigned long)cl;
1104 ssi->keep_alive.function = ssip_keep_alive;
1105 INIT_LIST_HEAD(&ssi->txqueue);
1106 INIT_LIST_HEAD(&ssi->cmdqueue);
1107 atomic_set(&ssi->tx_usecnt, 0);
1108 hsi_client_set_drvdata(cl, ssi);
1109 ssi->cl = cl;
1110 INIT_WORK(&ssi->work, ssip_xmit_work);
1111
1112 ssi->channel_id_cmd = hsi_get_channel_id_by_name(cl, "mcsaab-control");
1113 if (ssi->channel_id_cmd < 0) {
1114 err = ssi->channel_id_cmd;
1115 dev_err(dev, "Could not get cmd channel (%d)\n", err);
1116 goto out;
1117 }
1118
1119 ssi->channel_id_data = hsi_get_channel_id_by_name(cl, "mcsaab-data");
1120 if (ssi->channel_id_data < 0) {
1121 err = ssi->channel_id_data;
1122 dev_err(dev, "Could not get data channel (%d)\n", err);
1123 goto out;
1124 }
1125
1126 err = ssip_alloc_cmds(ssi);
1127 if (err < 0) {
1128 dev_err(dev, "No memory for commands\n");
1129 goto out;
1130 }
1131
1132 ssi->netdev = alloc_netdev(0, ifname, NET_NAME_UNKNOWN, ssip_pn_setup);
1133 if (!ssi->netdev) {
1134 dev_err(dev, "No memory for netdev\n");
1135 err = -ENOMEM;
1136 goto out1;
1137 }
1138
1139 SET_NETDEV_DEV(ssi->netdev, dev);
1140 netif_carrier_off(ssi->netdev);
1141 err = register_netdev(ssi->netdev);
1142 if (err < 0) {
1143 dev_err(dev, "Register netdev failed (%d)\n", err);
1144 goto out2;
1145 }
1146
1147 list_add(&ssi->link, &ssip_list);
1148
1149 dev_dbg(dev, "channel configuration: cmd=%d, data=%d\n",
1150 ssi->channel_id_cmd, ssi->channel_id_data);
1151
1152 return 0;
1153 out2:
1154 free_netdev(ssi->netdev);
1155 out1:
1156 ssip_free_cmds(ssi);
1157 out:
1158 kfree(ssi);
1159
1160 return err;
1161 }
1162
1163 static int ssi_protocol_remove(struct device *dev)
1164 {
1165 struct hsi_client *cl = to_hsi_client(dev);
1166 struct ssi_protocol *ssi = hsi_client_drvdata(cl);
1167
1168 list_del(&ssi->link);
1169 unregister_netdev(ssi->netdev);
1170 ssip_free_cmds(ssi);
1171 hsi_client_set_drvdata(cl, NULL);
1172 kfree(ssi);
1173
1174 return 0;
1175 }
1176
1177 static struct hsi_client_driver ssip_driver = {
1178 .driver = {
1179 .name = "ssi-protocol",
1180 .owner = THIS_MODULE,
1181 .probe = ssi_protocol_probe,
1182 .remove = ssi_protocol_remove,
1183 },
1184 };
1185
1186 static int __init ssip_init(void)
1187 {
1188 pr_info("SSI protocol aka McSAAB added\n");
1189
1190 return hsi_register_client_driver(&ssip_driver);
1191 }
1192 module_init(ssip_init);
1193
1194 static void __exit ssip_exit(void)
1195 {
1196 hsi_unregister_client_driver(&ssip_driver);
1197 pr_info("SSI protocol driver removed\n");
1198 }
1199 module_exit(ssip_exit);
1200
1201 MODULE_ALIAS("hsi:ssi-protocol");
1202 MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
1203 MODULE_AUTHOR("Remi Denis-Courmont <remi.denis-courmont@nokia.com>");
1204 MODULE_DESCRIPTION("SSI protocol improved aka McSAAB");
1205 MODULE_LICENSE("GPL");
Linux with added FPC-III support