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dc7bf5d7 SR |
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 | /* Main state machine states */ | |
92 | enum { | |
93 | INIT, | |
94 | HANDSHAKE, | |
95 | ACTIVE, | |
96 | }; | |
97 | ||
98 | /* Send state machine states */ | |
99 | enum { | |
100 | SEND_IDLE, | |
101 | WAIT4READY, | |
102 | SEND_READY, | |
103 | SENDING, | |
104 | SENDING_SWBREAK, | |
105 | }; | |
106 | ||
107 | /* Receive state machine states */ | |
108 | enum { | |
109 | RECV_IDLE, | |
110 | RECV_READY, | |
111 | RECEIVING, | |
112 | }; | |
113 | ||
114 | /** | |
115 | * struct ssi_protocol - SSI protocol (McSAAB) data | |
116 | * @main_state: Main state machine | |
117 | * @send_state: TX state machine | |
118 | * @recv_state: RX state machine | |
119 | * @waketest: Flag to follow wake line test | |
120 | * @rxid: RX data id | |
121 | * @txid: TX data id | |
122 | * @txqueue_len: TX queue length | |
123 | * @tx_wd: TX watchdog | |
124 | * @rx_wd: RX watchdog | |
125 | * @keep_alive: Workaround for SSI HW bug | |
126 | * @lock: To serialize access to this struct | |
127 | * @netdev: Phonet network device | |
128 | * @txqueue: TX data queue | |
129 | * @cmdqueue: Queue of free commands | |
130 | * @cl: HSI client own reference | |
131 | * @link: Link for ssip_list | |
132 | * @tx_usecount: Refcount to keep track the slaves that use the wake line | |
133 | * @channel_id_cmd: HSI channel id for command stream | |
134 | * @channel_id_data: HSI channel id for data stream | |
135 | */ | |
136 | struct ssi_protocol { | |
137 | unsigned int main_state; | |
138 | unsigned int send_state; | |
139 | unsigned int recv_state; | |
140 | unsigned int waketest:1; | |
141 | u8 rxid; | |
142 | u8 txid; | |
143 | unsigned int txqueue_len; | |
144 | struct timer_list tx_wd; | |
145 | struct timer_list rx_wd; | |
146 | struct timer_list keep_alive; /* wake-up workaround */ | |
147 | spinlock_t lock; | |
148 | struct net_device *netdev; | |
149 | struct list_head txqueue; | |
150 | struct list_head cmdqueue; | |
151 | struct hsi_client *cl; | |
152 | struct list_head link; | |
153 | atomic_t tx_usecnt; | |
154 | int channel_id_cmd; | |
155 | int channel_id_data; | |
156 | }; | |
157 | ||
158 | /* List of ssi protocol instances */ | |
159 | static LIST_HEAD(ssip_list); | |
160 | ||
161 | static void ssip_rxcmd_complete(struct hsi_msg *msg); | |
162 | ||
163 | static inline void ssip_set_cmd(struct hsi_msg *msg, u32 cmd) | |
164 | { | |
165 | u32 *data; | |
166 | ||
167 | data = sg_virt(msg->sgt.sgl); | |
168 | *data = cmd; | |
169 | } | |
170 | ||
171 | static inline u32 ssip_get_cmd(struct hsi_msg *msg) | |
172 | { | |
173 | u32 *data; | |
174 | ||
175 | data = sg_virt(msg->sgt.sgl); | |
176 | ||
177 | return *data; | |
178 | } | |
179 | ||
180 | static void ssip_skb_to_msg(struct sk_buff *skb, struct hsi_msg *msg) | |
181 | { | |
182 | skb_frag_t *frag; | |
183 | struct scatterlist *sg; | |
184 | int i; | |
185 | ||
186 | BUG_ON(msg->sgt.nents != (unsigned int)(skb_shinfo(skb)->nr_frags + 1)); | |
187 | ||
188 | sg = msg->sgt.sgl; | |
189 | sg_set_buf(sg, skb->data, skb_headlen(skb)); | |
190 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
191 | sg = sg_next(sg); | |
192 | BUG_ON(!sg); | |
193 | frag = &skb_shinfo(skb)->frags[i]; | |
194 | sg_set_page(sg, frag->page.p, frag->size, frag->page_offset); | |
195 | } | |
196 | } | |
197 | ||
198 | static void ssip_free_data(struct hsi_msg *msg) | |
199 | { | |
200 | struct sk_buff *skb; | |
201 | ||
202 | skb = msg->context; | |
203 | pr_debug("free data: msg %p context %p skb %p\n", msg, msg->context, | |
204 | skb); | |
205 | msg->destructor = NULL; | |
206 | dev_kfree_skb(skb); | |
207 | hsi_free_msg(msg); | |
208 | } | |
209 | ||
210 | static struct hsi_msg *ssip_alloc_data(struct ssi_protocol *ssi, | |
211 | struct sk_buff *skb, gfp_t flags) | |
212 | { | |
213 | struct hsi_msg *msg; | |
214 | ||
215 | msg = hsi_alloc_msg(skb_shinfo(skb)->nr_frags + 1, flags); | |
216 | if (!msg) | |
217 | return NULL; | |
218 | ssip_skb_to_msg(skb, msg); | |
219 | msg->destructor = ssip_free_data; | |
220 | msg->channel = ssi->channel_id_data; | |
221 | msg->context = skb; | |
222 | ||
223 | return msg; | |
224 | } | |
225 | ||
226 | static inline void ssip_release_cmd(struct hsi_msg *msg) | |
227 | { | |
228 | struct ssi_protocol *ssi = hsi_client_drvdata(msg->cl); | |
229 | ||
230 | dev_dbg(&msg->cl->device, "Release cmd 0x%08x\n", ssip_get_cmd(msg)); | |
231 | spin_lock_bh(&ssi->lock); | |
232 | list_add_tail(&msg->link, &ssi->cmdqueue); | |
233 | spin_unlock_bh(&ssi->lock); | |
234 | } | |
235 | ||
236 | static struct hsi_msg *ssip_claim_cmd(struct ssi_protocol *ssi) | |
237 | { | |
238 | struct hsi_msg *msg; | |
239 | ||
240 | BUG_ON(list_empty(&ssi->cmdqueue)); | |
241 | ||
242 | spin_lock_bh(&ssi->lock); | |
243 | msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link); | |
244 | list_del(&msg->link); | |
245 | spin_unlock_bh(&ssi->lock); | |
246 | msg->destructor = ssip_release_cmd; | |
247 | ||
248 | return msg; | |
249 | } | |
250 | ||
251 | static void ssip_free_cmds(struct ssi_protocol *ssi) | |
252 | { | |
253 | struct hsi_msg *msg, *tmp; | |
254 | ||
255 | list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) { | |
256 | list_del(&msg->link); | |
257 | msg->destructor = NULL; | |
258 | kfree(sg_virt(msg->sgt.sgl)); | |
259 | hsi_free_msg(msg); | |
260 | } | |
261 | } | |
262 | ||
263 | static int ssip_alloc_cmds(struct ssi_protocol *ssi) | |
264 | { | |
265 | struct hsi_msg *msg; | |
266 | u32 *buf; | |
267 | unsigned int i; | |
268 | ||
269 | for (i = 0; i < SSIP_MAX_CMDS; i++) { | |
270 | msg = hsi_alloc_msg(1, GFP_KERNEL); | |
271 | if (!msg) | |
272 | goto out; | |
273 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
274 | if (!buf) { | |
275 | hsi_free_msg(msg); | |
276 | goto out; | |
277 | } | |
278 | sg_init_one(msg->sgt.sgl, buf, sizeof(*buf)); | |
279 | msg->channel = ssi->channel_id_cmd; | |
280 | list_add_tail(&msg->link, &ssi->cmdqueue); | |
281 | } | |
282 | ||
283 | return 0; | |
284 | out: | |
285 | ssip_free_cmds(ssi); | |
286 | ||
287 | return -ENOMEM; | |
288 | } | |
289 | ||
290 | static void ssip_set_rxstate(struct ssi_protocol *ssi, unsigned int state) | |
291 | { | |
292 | ssi->recv_state = state; | |
293 | switch (state) { | |
294 | case RECV_IDLE: | |
295 | del_timer(&ssi->rx_wd); | |
296 | if (ssi->send_state == SEND_IDLE) | |
297 | del_timer(&ssi->keep_alive); | |
298 | break; | |
299 | case RECV_READY: | |
300 | /* CMT speech workaround */ | |
301 | if (atomic_read(&ssi->tx_usecnt)) | |
302 | break; | |
303 | /* Otherwise fall through */ | |
304 | case RECEIVING: | |
305 | mod_timer(&ssi->keep_alive, jiffies + | |
306 | msecs_to_jiffies(SSIP_KATOUT)); | |
307 | mod_timer(&ssi->rx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); | |
308 | break; | |
309 | default: | |
310 | break; | |
311 | } | |
312 | } | |
313 | ||
314 | static void ssip_set_txstate(struct ssi_protocol *ssi, unsigned int state) | |
315 | { | |
316 | ssi->send_state = state; | |
317 | switch (state) { | |
318 | case SEND_IDLE: | |
319 | case SEND_READY: | |
320 | del_timer(&ssi->tx_wd); | |
321 | if (ssi->recv_state == RECV_IDLE) | |
322 | del_timer(&ssi->keep_alive); | |
323 | break; | |
324 | case WAIT4READY: | |
325 | case SENDING: | |
326 | case SENDING_SWBREAK: | |
327 | mod_timer(&ssi->keep_alive, | |
328 | jiffies + msecs_to_jiffies(SSIP_KATOUT)); | |
329 | mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); | |
330 | break; | |
331 | default: | |
332 | break; | |
333 | } | |
334 | } | |
335 | ||
336 | struct hsi_client *ssip_slave_get_master(struct hsi_client *slave) | |
337 | { | |
338 | struct hsi_client *master = ERR_PTR(-ENODEV); | |
339 | struct ssi_protocol *ssi; | |
340 | ||
341 | list_for_each_entry(ssi, &ssip_list, link) | |
342 | if (slave->device.parent == ssi->cl->device.parent) { | |
343 | master = ssi->cl; | |
344 | break; | |
345 | } | |
346 | ||
347 | return master; | |
348 | } | |
349 | EXPORT_SYMBOL_GPL(ssip_slave_get_master); | |
350 | ||
351 | int ssip_slave_start_tx(struct hsi_client *master) | |
352 | { | |
353 | struct ssi_protocol *ssi = hsi_client_drvdata(master); | |
354 | ||
355 | dev_dbg(&master->device, "start TX %d\n", atomic_read(&ssi->tx_usecnt)); | |
356 | spin_lock_bh(&ssi->lock); | |
357 | if (ssi->send_state == SEND_IDLE) { | |
358 | ssip_set_txstate(ssi, WAIT4READY); | |
359 | hsi_start_tx(master); | |
360 | } | |
361 | spin_unlock_bh(&ssi->lock); | |
362 | atomic_inc(&ssi->tx_usecnt); | |
363 | ||
364 | return 0; | |
365 | } | |
366 | EXPORT_SYMBOL_GPL(ssip_slave_start_tx); | |
367 | ||
368 | int ssip_slave_stop_tx(struct hsi_client *master) | |
369 | { | |
370 | struct ssi_protocol *ssi = hsi_client_drvdata(master); | |
371 | ||
372 | WARN_ON_ONCE(atomic_read(&ssi->tx_usecnt) == 0); | |
373 | ||
374 | if (atomic_dec_and_test(&ssi->tx_usecnt)) { | |
375 | spin_lock_bh(&ssi->lock); | |
376 | if ((ssi->send_state == SEND_READY) || | |
377 | (ssi->send_state == WAIT4READY)) { | |
378 | ssip_set_txstate(ssi, SEND_IDLE); | |
379 | hsi_stop_tx(master); | |
380 | } | |
381 | spin_unlock_bh(&ssi->lock); | |
382 | } | |
383 | dev_dbg(&master->device, "stop TX %d\n", atomic_read(&ssi->tx_usecnt)); | |
384 | ||
385 | return 0; | |
386 | } | |
387 | EXPORT_SYMBOL_GPL(ssip_slave_stop_tx); | |
388 | ||
389 | int ssip_slave_running(struct hsi_client *master) | |
390 | { | |
391 | struct ssi_protocol *ssi = hsi_client_drvdata(master); | |
392 | return netif_running(ssi->netdev); | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(ssip_slave_running); | |
395 | ||
396 | static void ssip_reset(struct hsi_client *cl) | |
397 | { | |
398 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
399 | struct list_head *head, *tmp; | |
400 | struct hsi_msg *msg; | |
401 | ||
402 | if (netif_running(ssi->netdev)) | |
403 | netif_carrier_off(ssi->netdev); | |
404 | hsi_flush(cl); | |
405 | spin_lock_bh(&ssi->lock); | |
406 | if (ssi->send_state != SEND_IDLE) | |
407 | hsi_stop_tx(cl); | |
408 | if (ssi->waketest) | |
409 | ssi_waketest(cl, 0); | |
410 | del_timer(&ssi->rx_wd); | |
411 | del_timer(&ssi->tx_wd); | |
412 | del_timer(&ssi->keep_alive); | |
413 | ssi->main_state = 0; | |
414 | ssi->send_state = 0; | |
415 | ssi->recv_state = 0; | |
416 | ssi->waketest = 0; | |
417 | ssi->rxid = 0; | |
418 | ssi->txid = 0; | |
419 | list_for_each_safe(head, tmp, &ssi->txqueue) { | |
420 | msg = list_entry(head, struct hsi_msg, link); | |
421 | dev_dbg(&cl->device, "Pending TX data\n"); | |
422 | list_del(head); | |
423 | ssip_free_data(msg); | |
424 | } | |
425 | ssi->txqueue_len = 0; | |
426 | spin_unlock_bh(&ssi->lock); | |
427 | } | |
428 | ||
429 | static void ssip_dump_state(struct hsi_client *cl) | |
430 | { | |
431 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
432 | struct hsi_msg *msg; | |
433 | ||
434 | spin_lock_bh(&ssi->lock); | |
435 | dev_err(&cl->device, "Main state: %d\n", ssi->main_state); | |
436 | dev_err(&cl->device, "Recv state: %d\n", ssi->recv_state); | |
437 | dev_err(&cl->device, "Send state: %d\n", ssi->send_state); | |
438 | dev_err(&cl->device, "CMT %s\n", (ssi->main_state == ACTIVE) ? | |
439 | "Online" : "Offline"); | |
440 | dev_err(&cl->device, "Wake test %d\n", ssi->waketest); | |
441 | dev_err(&cl->device, "Data RX id: %d\n", ssi->rxid); | |
442 | dev_err(&cl->device, "Data TX id: %d\n", ssi->txid); | |
443 | ||
444 | list_for_each_entry(msg, &ssi->txqueue, link) | |
445 | dev_err(&cl->device, "pending TX data (%p)\n", msg); | |
446 | spin_unlock_bh(&ssi->lock); | |
447 | } | |
448 | ||
449 | static void ssip_error(struct hsi_client *cl) | |
450 | { | |
451 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
452 | struct hsi_msg *msg; | |
453 | ||
454 | ssip_dump_state(cl); | |
455 | ssip_reset(cl); | |
456 | msg = ssip_claim_cmd(ssi); | |
457 | msg->complete = ssip_rxcmd_complete; | |
458 | hsi_async_read(cl, msg); | |
459 | } | |
460 | ||
461 | static void ssip_keep_alive(unsigned long data) | |
462 | { | |
463 | struct hsi_client *cl = (struct hsi_client *)data; | |
464 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
465 | ||
466 | dev_dbg(&cl->device, "Keep alive kick in: m(%d) r(%d) s(%d)\n", | |
467 | ssi->main_state, ssi->recv_state, ssi->send_state); | |
468 | ||
469 | spin_lock(&ssi->lock); | |
470 | if (ssi->recv_state == RECV_IDLE) | |
471 | switch (ssi->send_state) { | |
472 | case SEND_READY: | |
473 | if (atomic_read(&ssi->tx_usecnt) == 0) | |
474 | break; | |
475 | /* | |
476 | * Fall through. Workaround for cmt-speech | |
477 | * in that case we relay on audio timers. | |
478 | */ | |
479 | case SEND_IDLE: | |
480 | spin_unlock(&ssi->lock); | |
481 | return; | |
482 | } | |
483 | mod_timer(&ssi->keep_alive, jiffies + msecs_to_jiffies(SSIP_KATOUT)); | |
484 | spin_unlock(&ssi->lock); | |
485 | } | |
486 | ||
487 | static void ssip_wd(unsigned long data) | |
488 | { | |
489 | struct hsi_client *cl = (struct hsi_client *)data; | |
490 | ||
491 | dev_err(&cl->device, "Watchdog trigerred\n"); | |
492 | ssip_error(cl); | |
493 | } | |
494 | ||
495 | static void ssip_send_bootinfo_req_cmd(struct hsi_client *cl) | |
496 | { | |
497 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
498 | struct hsi_msg *msg; | |
499 | ||
500 | dev_dbg(&cl->device, "Issuing BOOT INFO REQ command\n"); | |
501 | msg = ssip_claim_cmd(ssi); | |
502 | ssip_set_cmd(msg, SSIP_BOOTINFO_REQ_CMD(SSIP_LOCAL_VERID)); | |
503 | msg->complete = ssip_release_cmd; | |
504 | hsi_async_write(cl, msg); | |
505 | dev_dbg(&cl->device, "Issuing RX command\n"); | |
506 | msg = ssip_claim_cmd(ssi); | |
507 | msg->complete = ssip_rxcmd_complete; | |
508 | hsi_async_read(cl, msg); | |
509 | } | |
510 | ||
511 | static void ssip_start_rx(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, "RX start M(%d) R(%d)\n", ssi->main_state, | |
517 | ssi->recv_state); | |
518 | spin_lock(&ssi->lock); | |
519 | /* | |
520 | * We can have two UP events in a row due to a short low | |
521 | * high transition. Therefore we need to ignore the sencond UP event. | |
522 | */ | |
523 | if ((ssi->main_state != ACTIVE) || (ssi->recv_state == RECV_READY)) { | |
524 | if (ssi->main_state == INIT) { | |
525 | ssi->main_state = HANDSHAKE; | |
526 | spin_unlock(&ssi->lock); | |
527 | ssip_send_bootinfo_req_cmd(cl); | |
528 | } else { | |
529 | spin_unlock(&ssi->lock); | |
530 | } | |
531 | return; | |
532 | } | |
533 | ssip_set_rxstate(ssi, RECV_READY); | |
534 | spin_unlock(&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(&ssi->lock); | |
549 | if (likely(ssi->main_state == ACTIVE)) | |
550 | ssip_set_rxstate(ssi, RECV_IDLE); | |
551 | spin_unlock(&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(&ssi->lock); | |
569 | ssip_set_txstate(ssi, SENDING); | |
570 | spin_unlock(&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 | spin_lock(&ssi->lock); | |
675 | ssi->main_state = HANDSHAKE; | |
676 | if (!ssi->waketest) { | |
677 | ssi->waketest = 1; | |
678 | ssi_waketest(cl, 1); /* FIXME: To be removed */ | |
679 | } | |
680 | /* Start boot handshake watchdog */ | |
681 | mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); | |
682 | spin_unlock(&ssi->lock); | |
683 | dev_dbg(&cl->device, "Send BOOTINFO_RESP\n"); | |
684 | if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID) | |
685 | dev_warn(&cl->device, "boot info req verid mismatch\n"); | |
686 | msg = ssip_claim_cmd(ssi); | |
687 | ssip_set_cmd(msg, SSIP_BOOTINFO_RESP_CMD(SSIP_LOCAL_VERID)); | |
688 | msg->complete = ssip_release_cmd; | |
689 | hsi_async_write(cl, msg); | |
690 | break; | |
691 | case HANDSHAKE: | |
692 | /* Ignore */ | |
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(&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(&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(&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(&ssi->lock); | |
727 | return; | |
728 | } | |
729 | if (ssi->waketest) { | |
730 | ssi->waketest = 0; | |
731 | ssi_waketest(cl, 0); /* FIXME: To be removed */ | |
732 | } | |
733 | ssi->main_state = ACTIVE; | |
734 | del_timer(&ssi->tx_wd); /* Stop boot handshake timer */ | |
735 | spin_unlock(&ssi->lock); | |
736 | ||
737 | dev_notice(&cl->device, "WAKELINES TEST %s\n", | |
738 | wkres & SSIP_WAKETEST_FAILED ? "FAILED" : "OK"); | |
739 | if (wkres & SSIP_WAKETEST_FAILED) { | |
740 | ssip_error(cl); | |
741 | return; | |
742 | } | |
743 | dev_dbg(&cl->device, "CMT is ONLINE\n"); | |
744 | netif_wake_queue(ssi->netdev); | |
745 | netif_carrier_on(ssi->netdev); | |
746 | } | |
747 | ||
748 | static void ssip_rx_ready(struct hsi_client *cl) | |
749 | { | |
750 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
751 | ||
752 | spin_lock(&ssi->lock); | |
753 | if (unlikely(ssi->main_state != ACTIVE)) { | |
754 | dev_dbg(&cl->device, "READY on wrong state: S(%d) M(%d)\n", | |
755 | ssi->send_state, ssi->main_state); | |
756 | spin_unlock(&ssi->lock); | |
757 | return; | |
758 | } | |
759 | if (ssi->send_state != WAIT4READY) { | |
760 | dev_dbg(&cl->device, "Ignore spurious READY command\n"); | |
761 | spin_unlock(&ssi->lock); | |
762 | return; | |
763 | } | |
764 | ssip_set_txstate(ssi, SEND_READY); | |
765 | spin_unlock(&ssi->lock); | |
766 | ssip_xmit(cl); | |
767 | } | |
768 | ||
769 | static void ssip_rx_strans(struct hsi_client *cl, u32 cmd) | |
770 | { | |
771 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
772 | struct sk_buff *skb; | |
773 | struct hsi_msg *msg; | |
774 | int len = SSIP_PDU_LENGTH(cmd); | |
775 | ||
776 | dev_dbg(&cl->device, "RX strans: %d frames\n", len); | |
777 | spin_lock(&ssi->lock); | |
778 | if (unlikely(ssi->main_state != ACTIVE)) { | |
779 | dev_err(&cl->device, "START TRANS wrong state: S(%d) M(%d)\n", | |
780 | ssi->send_state, ssi->main_state); | |
781 | spin_unlock(&ssi->lock); | |
782 | return; | |
783 | } | |
784 | ssip_set_rxstate(ssi, RECEIVING); | |
785 | if (unlikely(SSIP_MSG_ID(cmd) != ssi->rxid)) { | |
c616ac28 | 786 | dev_err(&cl->device, "START TRANS id %d expected %d\n", |
dc7bf5d7 SR |
787 | SSIP_MSG_ID(cmd), ssi->rxid); |
788 | spin_unlock(&ssi->lock); | |
789 | goto out1; | |
790 | } | |
791 | ssi->rxid++; | |
792 | spin_unlock(&ssi->lock); | |
793 | skb = netdev_alloc_skb(ssi->netdev, len * 4); | |
794 | if (unlikely(!skb)) { | |
795 | dev_err(&cl->device, "No memory for rx skb\n"); | |
796 | goto out1; | |
797 | } | |
798 | skb->dev = ssi->netdev; | |
799 | skb_put(skb, len * 4); | |
800 | msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC); | |
801 | if (unlikely(!msg)) { | |
802 | dev_err(&cl->device, "No memory for RX data msg\n"); | |
803 | goto out2; | |
804 | } | |
805 | msg->complete = ssip_rx_data_complete; | |
806 | hsi_async_read(cl, msg); | |
807 | ||
808 | return; | |
809 | out2: | |
810 | dev_kfree_skb(skb); | |
811 | out1: | |
812 | ssip_error(cl); | |
813 | } | |
814 | ||
815 | static void ssip_rxcmd_complete(struct hsi_msg *msg) | |
816 | { | |
817 | struct hsi_client *cl = msg->cl; | |
818 | u32 cmd = ssip_get_cmd(msg); | |
819 | unsigned int cmdid = SSIP_COMMAND(cmd); | |
820 | ||
821 | if (msg->status == HSI_STATUS_ERROR) { | |
822 | dev_err(&cl->device, "RX error detected\n"); | |
823 | ssip_release_cmd(msg); | |
824 | ssip_error(cl); | |
825 | return; | |
826 | } | |
827 | hsi_async_read(cl, msg); | |
828 | dev_dbg(&cl->device, "RX cmd: 0x%08x\n", cmd); | |
829 | switch (cmdid) { | |
830 | case SSIP_SW_BREAK: | |
831 | /* Ignored */ | |
832 | break; | |
833 | case SSIP_BOOTINFO_REQ: | |
834 | ssip_rx_bootinforeq(cl, cmd); | |
835 | break; | |
836 | case SSIP_BOOTINFO_RESP: | |
837 | ssip_rx_bootinforesp(cl, cmd); | |
838 | break; | |
839 | case SSIP_WAKETEST_RESULT: | |
840 | ssip_rx_waketest(cl, cmd); | |
841 | break; | |
842 | case SSIP_START_TRANS: | |
843 | ssip_rx_strans(cl, cmd); | |
844 | break; | |
845 | case SSIP_READY: | |
846 | ssip_rx_ready(cl); | |
847 | break; | |
848 | default: | |
849 | dev_warn(&cl->device, "command 0x%08x not supported\n", cmd); | |
850 | break; | |
851 | } | |
852 | } | |
853 | ||
854 | static void ssip_swbreak_complete(struct hsi_msg *msg) | |
855 | { | |
856 | struct hsi_client *cl = msg->cl; | |
857 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
858 | ||
859 | ssip_release_cmd(msg); | |
860 | spin_lock(&ssi->lock); | |
861 | if (list_empty(&ssi->txqueue)) { | |
862 | if (atomic_read(&ssi->tx_usecnt)) { | |
863 | ssip_set_txstate(ssi, SEND_READY); | |
864 | } else { | |
865 | ssip_set_txstate(ssi, SEND_IDLE); | |
866 | hsi_stop_tx(cl); | |
867 | } | |
868 | spin_unlock(&ssi->lock); | |
869 | } else { | |
870 | spin_unlock(&ssi->lock); | |
871 | ssip_xmit(cl); | |
872 | } | |
873 | netif_wake_queue(ssi->netdev); | |
874 | } | |
875 | ||
876 | static void ssip_tx_data_complete(struct hsi_msg *msg) | |
877 | { | |
878 | struct hsi_client *cl = msg->cl; | |
879 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
880 | struct hsi_msg *cmsg; | |
881 | ||
882 | if (msg->status == HSI_STATUS_ERROR) { | |
883 | dev_err(&cl->device, "TX data error\n"); | |
884 | ssip_error(cl); | |
885 | goto out; | |
886 | } | |
887 | spin_lock(&ssi->lock); | |
888 | if (list_empty(&ssi->txqueue)) { | |
889 | ssip_set_txstate(ssi, SENDING_SWBREAK); | |
890 | spin_unlock(&ssi->lock); | |
891 | cmsg = ssip_claim_cmd(ssi); | |
892 | ssip_set_cmd(cmsg, SSIP_SWBREAK_CMD); | |
893 | cmsg->complete = ssip_swbreak_complete; | |
894 | dev_dbg(&cl->device, "Send SWBREAK\n"); | |
895 | hsi_async_write(cl, cmsg); | |
896 | } else { | |
897 | spin_unlock(&ssi->lock); | |
898 | ssip_xmit(cl); | |
899 | } | |
900 | out: | |
901 | ssip_free_data(msg); | |
902 | } | |
903 | ||
0a0ea07d | 904 | static void ssip_port_event(struct hsi_client *cl, unsigned long event) |
dc7bf5d7 SR |
905 | { |
906 | switch (event) { | |
907 | case HSI_EVENT_START_RX: | |
908 | ssip_start_rx(cl); | |
909 | break; | |
910 | case HSI_EVENT_STOP_RX: | |
911 | ssip_stop_rx(cl); | |
912 | break; | |
913 | default: | |
914 | return; | |
915 | } | |
916 | } | |
917 | ||
918 | static int ssip_pn_open(struct net_device *dev) | |
919 | { | |
920 | struct hsi_client *cl = to_hsi_client(dev->dev.parent); | |
921 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
922 | int err; | |
923 | ||
924 | err = hsi_claim_port(cl, 1); | |
925 | if (err < 0) { | |
926 | dev_err(&cl->device, "SSI port already claimed\n"); | |
927 | return err; | |
928 | } | |
929 | err = hsi_register_port_event(cl, ssip_port_event); | |
930 | if (err < 0) { | |
931 | dev_err(&cl->device, "Register HSI port event failed (%d)\n", | |
932 | err); | |
933 | return err; | |
934 | } | |
935 | dev_dbg(&cl->device, "Configuring SSI port\n"); | |
936 | hsi_setup(cl); | |
937 | spin_lock_bh(&ssi->lock); | |
938 | if (!ssi->waketest) { | |
939 | ssi->waketest = 1; | |
940 | ssi_waketest(cl, 1); /* FIXME: To be removed */ | |
941 | } | |
942 | ssi->main_state = INIT; | |
943 | spin_unlock_bh(&ssi->lock); | |
944 | ||
945 | return 0; | |
946 | } | |
947 | ||
948 | static int ssip_pn_stop(struct net_device *dev) | |
949 | { | |
950 | struct hsi_client *cl = to_hsi_client(dev->dev.parent); | |
951 | ||
952 | ssip_reset(cl); | |
953 | hsi_unregister_port_event(cl); | |
954 | hsi_release_port(cl); | |
955 | ||
956 | return 0; | |
957 | } | |
958 | ||
959 | static int ssip_pn_set_mtu(struct net_device *dev, int new_mtu) | |
960 | { | |
961 | if (new_mtu > SSIP_MAX_MTU || new_mtu < PHONET_MIN_MTU) | |
962 | return -EINVAL; | |
963 | dev->mtu = new_mtu; | |
964 | ||
965 | return 0; | |
966 | } | |
967 | ||
968 | static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev) | |
969 | { | |
970 | struct hsi_client *cl = to_hsi_client(dev->dev.parent); | |
971 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
972 | struct hsi_msg *msg; | |
973 | ||
974 | if ((skb->protocol != htons(ETH_P_PHONET)) || | |
975 | (skb->len < SSIP_MIN_PN_HDR)) | |
976 | goto drop; | |
977 | /* Pad to 32-bits - FIXME: Revisit*/ | |
978 | if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3))) | |
979 | goto drop; | |
980 | ||
981 | /* | |
982 | * Modem sends Phonet messages over SSI with its own endianess... | |
983 | * Assume that modem has the same endianess as we do. | |
984 | */ | |
985 | if (skb_cow_head(skb, 0)) | |
986 | goto drop; | |
987 | ||
988 | /* length field is exchanged in network byte order */ | |
989 | ((u16 *)skb->data)[2] = htons(((u16 *)skb->data)[2]); | |
990 | ||
991 | msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC); | |
992 | if (!msg) { | |
993 | dev_dbg(&cl->device, "Dropping tx data: No memory\n"); | |
994 | goto drop; | |
995 | } | |
996 | msg->complete = ssip_tx_data_complete; | |
997 | ||
998 | spin_lock_bh(&ssi->lock); | |
999 | if (unlikely(ssi->main_state != ACTIVE)) { | |
1000 | spin_unlock_bh(&ssi->lock); | |
1001 | dev_dbg(&cl->device, "Dropping tx data: CMT is OFFLINE\n"); | |
1002 | goto drop2; | |
1003 | } | |
1004 | list_add_tail(&msg->link, &ssi->txqueue); | |
1005 | ssi->txqueue_len++; | |
1006 | if (dev->tx_queue_len < ssi->txqueue_len) { | |
1007 | dev_info(&cl->device, "TX queue full %d\n", ssi->txqueue_len); | |
1008 | netif_stop_queue(dev); | |
1009 | } | |
1010 | if (ssi->send_state == SEND_IDLE) { | |
1011 | ssip_set_txstate(ssi, WAIT4READY); | |
1012 | spin_unlock_bh(&ssi->lock); | |
1013 | dev_dbg(&cl->device, "Start TX qlen %d\n", ssi->txqueue_len); | |
1014 | hsi_start_tx(cl); | |
1015 | } else if (ssi->send_state == SEND_READY) { | |
1016 | /* Needed for cmt-speech workaround */ | |
1017 | dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n", | |
1018 | ssi->txqueue_len); | |
1019 | spin_unlock_bh(&ssi->lock); | |
1020 | ssip_xmit(cl); | |
1021 | } else { | |
1022 | spin_unlock_bh(&ssi->lock); | |
1023 | } | |
1024 | dev->stats.tx_packets++; | |
1025 | dev->stats.tx_bytes += skb->len; | |
1026 | ||
1027 | return 0; | |
1028 | drop2: | |
1029 | hsi_free_msg(msg); | |
1030 | drop: | |
1031 | dev->stats.tx_dropped++; | |
1032 | dev_kfree_skb(skb); | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | /* CMT reset event handler */ | |
1038 | void ssip_reset_event(struct hsi_client *master) | |
1039 | { | |
1040 | struct ssi_protocol *ssi = hsi_client_drvdata(master); | |
1041 | dev_err(&ssi->cl->device, "CMT reset detected!\n"); | |
1042 | ssip_error(ssi->cl); | |
1043 | } | |
1044 | EXPORT_SYMBOL_GPL(ssip_reset_event); | |
1045 | ||
1046 | static const struct net_device_ops ssip_pn_ops = { | |
1047 | .ndo_open = ssip_pn_open, | |
1048 | .ndo_stop = ssip_pn_stop, | |
1049 | .ndo_start_xmit = ssip_pn_xmit, | |
1050 | .ndo_change_mtu = ssip_pn_set_mtu, | |
1051 | }; | |
1052 | ||
1053 | static void ssip_pn_setup(struct net_device *dev) | |
1054 | { | |
1055 | dev->features = 0; | |
1056 | dev->netdev_ops = &ssip_pn_ops; | |
1057 | dev->type = ARPHRD_PHONET; | |
1058 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
1059 | dev->mtu = SSIP_DEFAULT_MTU; | |
1060 | dev->hard_header_len = 1; | |
1061 | dev->dev_addr[0] = PN_MEDIA_SOS; | |
1062 | dev->addr_len = 1; | |
1063 | dev->tx_queue_len = SSIP_TXQUEUE_LEN; | |
1064 | ||
1065 | dev->destructor = free_netdev; | |
1066 | dev->header_ops = &phonet_header_ops; | |
1067 | } | |
1068 | ||
1069 | static int ssi_protocol_probe(struct device *dev) | |
1070 | { | |
1071 | static const char ifname[] = "phonet%d"; | |
1072 | struct hsi_client *cl = to_hsi_client(dev); | |
1073 | struct ssi_protocol *ssi; | |
1074 | int err; | |
1075 | ||
1076 | ssi = kzalloc(sizeof(*ssi), GFP_KERNEL); | |
1077 | if (!ssi) { | |
1078 | dev_err(dev, "No memory for ssi protocol\n"); | |
1079 | return -ENOMEM; | |
1080 | } | |
1081 | ||
1082 | spin_lock_init(&ssi->lock); | |
1083 | init_timer_deferrable(&ssi->rx_wd); | |
1084 | init_timer_deferrable(&ssi->tx_wd); | |
1085 | init_timer(&ssi->keep_alive); | |
1086 | ssi->rx_wd.data = (unsigned long)cl; | |
1087 | ssi->rx_wd.function = ssip_wd; | |
1088 | ssi->tx_wd.data = (unsigned long)cl; | |
1089 | ssi->tx_wd.function = ssip_wd; | |
1090 | ssi->keep_alive.data = (unsigned long)cl; | |
1091 | ssi->keep_alive.function = ssip_keep_alive; | |
1092 | INIT_LIST_HEAD(&ssi->txqueue); | |
1093 | INIT_LIST_HEAD(&ssi->cmdqueue); | |
1094 | atomic_set(&ssi->tx_usecnt, 0); | |
1095 | hsi_client_set_drvdata(cl, ssi); | |
1096 | ssi->cl = cl; | |
1097 | ||
1098 | ssi->channel_id_cmd = hsi_get_channel_id_by_name(cl, "mcsaab-control"); | |
1099 | if (ssi->channel_id_cmd < 0) { | |
1100 | err = ssi->channel_id_cmd; | |
1101 | dev_err(dev, "Could not get cmd channel (%d)\n", err); | |
1102 | goto out; | |
1103 | } | |
1104 | ||
1105 | ssi->channel_id_data = hsi_get_channel_id_by_name(cl, "mcsaab-data"); | |
1106 | if (ssi->channel_id_data < 0) { | |
1107 | err = ssi->channel_id_data; | |
1108 | dev_err(dev, "Could not get data channel (%d)\n", err); | |
1109 | goto out; | |
1110 | } | |
1111 | ||
1112 | err = ssip_alloc_cmds(ssi); | |
1113 | if (err < 0) { | |
1114 | dev_err(dev, "No memory for commands\n"); | |
1115 | goto out; | |
1116 | } | |
1117 | ||
c835a677 | 1118 | ssi->netdev = alloc_netdev(0, ifname, NET_NAME_UNKNOWN, ssip_pn_setup); |
dc7bf5d7 SR |
1119 | if (!ssi->netdev) { |
1120 | dev_err(dev, "No memory for netdev\n"); | |
1121 | err = -ENOMEM; | |
1122 | goto out1; | |
1123 | } | |
1124 | ||
1125 | SET_NETDEV_DEV(ssi->netdev, dev); | |
1126 | netif_carrier_off(ssi->netdev); | |
1127 | err = register_netdev(ssi->netdev); | |
1128 | if (err < 0) { | |
1129 | dev_err(dev, "Register netdev failed (%d)\n", err); | |
1130 | goto out2; | |
1131 | } | |
1132 | ||
1133 | list_add(&ssi->link, &ssip_list); | |
1134 | ||
1135 | dev_dbg(dev, "channel configuration: cmd=%d, data=%d\n", | |
1136 | ssi->channel_id_cmd, ssi->channel_id_data); | |
1137 | ||
1138 | return 0; | |
1139 | out2: | |
1140 | free_netdev(ssi->netdev); | |
1141 | out1: | |
1142 | ssip_free_cmds(ssi); | |
1143 | out: | |
1144 | kfree(ssi); | |
1145 | ||
1146 | return err; | |
1147 | } | |
1148 | ||
1149 | static int ssi_protocol_remove(struct device *dev) | |
1150 | { | |
1151 | struct hsi_client *cl = to_hsi_client(dev); | |
1152 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
1153 | ||
1154 | list_del(&ssi->link); | |
1155 | unregister_netdev(ssi->netdev); | |
1156 | ssip_free_cmds(ssi); | |
1157 | hsi_client_set_drvdata(cl, NULL); | |
1158 | kfree(ssi); | |
1159 | ||
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | static struct hsi_client_driver ssip_driver = { | |
1164 | .driver = { | |
1165 | .name = "ssi-protocol", | |
1166 | .owner = THIS_MODULE, | |
1167 | .probe = ssi_protocol_probe, | |
1168 | .remove = ssi_protocol_remove, | |
1169 | }, | |
1170 | }; | |
1171 | ||
1172 | static int __init ssip_init(void) | |
1173 | { | |
1174 | pr_info("SSI protocol aka McSAAB added\n"); | |
1175 | ||
1176 | return hsi_register_client_driver(&ssip_driver); | |
1177 | } | |
1178 | module_init(ssip_init); | |
1179 | ||
1180 | static void __exit ssip_exit(void) | |
1181 | { | |
1182 | hsi_unregister_client_driver(&ssip_driver); | |
1183 | pr_info("SSI protocol driver removed\n"); | |
1184 | } | |
1185 | module_exit(ssip_exit); | |
1186 | ||
1187 | MODULE_ALIAS("hsi:ssi-protocol"); | |
1188 | MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); | |
1189 | MODULE_AUTHOR("Remi Denis-Courmont <remi.denis-courmont@nokia.com>"); | |
1190 | MODULE_DESCRIPTION("SSI protocol improved aka McSAAB"); | |
1191 | MODULE_LICENSE("GPL"); |