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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 | ||
6d6c3097 SR |
91 | #define SSIP_WAKETEST_FLAG 0 |
92 | ||
dc7bf5d7 SR |
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 | |
6d6c3097 | 121 | * @flags: Flags, currently only used to follow wake line test |
dc7bf5d7 SR |
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; | |
6d6c3097 | 142 | unsigned long flags; |
dc7bf5d7 SR |
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; | |
df26d639 | 153 | struct work_struct work; |
dc7bf5d7 SR |
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); | |
6d6c3097 SR |
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); | |
dc7bf5d7 SR |
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; | |
6d6c3097 | 421 | ssi->flags = 0; |
dc7bf5d7 SR |
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"); | |
6d6c3097 SR |
445 | dev_err(&cl->device, "Wake test %d\n", |
446 | test_bit(SSIP_WAKETEST_FLAG, &ssi->flags)); | |
dc7bf5d7 SR |
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); | |
866dcb9d | 524 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
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)) { | |
866dcb9d | 530 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
531 | return; |
532 | } | |
533 | ssip_set_rxstate(ssi, RECV_READY); | |
866dcb9d | 534 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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); | |
866dcb9d | 548 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
549 | if (likely(ssi->main_state == ACTIVE)) |
550 | ssip_set_rxstate(ssi, RECV_IDLE); | |
866dcb9d | 551 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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); | |
866dcb9d | 568 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 | 569 | ssip_set_txstate(ssi, SENDING); |
866dcb9d | 570 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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: | |
87d99063 | 674 | case HANDSHAKE: |
866dcb9d | 675 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 | 676 | ssi->main_state = HANDSHAKE; |
866dcb9d | 677 | spin_unlock_bh(&ssi->lock); |
6d6c3097 SR |
678 | |
679 | if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) | |
dc7bf5d7 | 680 | ssi_waketest(cl, 1); /* FIXME: To be removed */ |
6d6c3097 | 681 | |
866dcb9d | 682 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
683 | /* Start boot handshake watchdog */ |
684 | mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); | |
866dcb9d | 685 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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; | |
dc7bf5d7 SR |
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 | ||
866dcb9d | 707 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
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); | |
866dcb9d | 714 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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 | ||
866dcb9d | 722 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
723 | if (ssi->main_state != HANDSHAKE) { |
724 | dev_dbg(&cl->device, "wake lines test ignored M(%d)\n", | |
725 | ssi->main_state); | |
866dcb9d | 726 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
727 | return; |
728 | } | |
866dcb9d | 729 | spin_unlock_bh(&ssi->lock); |
6d6c3097 SR |
730 | |
731 | if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) | |
dc7bf5d7 | 732 | ssi_waketest(cl, 0); /* FIXME: To be removed */ |
6d6c3097 | 733 | |
866dcb9d | 734 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
735 | ssi->main_state = ACTIVE; |
736 | del_timer(&ssi->tx_wd); /* Stop boot handshake timer */ | |
866dcb9d | 737 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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 | ||
866dcb9d | 754 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
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); | |
866dcb9d | 758 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
759 | return; |
760 | } | |
761 | if (ssi->send_state != WAIT4READY) { | |
762 | dev_dbg(&cl->device, "Ignore spurious READY command\n"); | |
866dcb9d | 763 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
764 | return; |
765 | } | |
766 | ssip_set_txstate(ssi, SEND_READY); | |
866dcb9d | 767 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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); | |
866dcb9d | 779 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
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); | |
866dcb9d | 783 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
784 | return; |
785 | } | |
786 | ssip_set_rxstate(ssi, RECEIVING); | |
787 | if (unlikely(SSIP_MSG_ID(cmd) != ssi->rxid)) { | |
c616ac28 | 788 | dev_err(&cl->device, "START TRANS id %d expected %d\n", |
dc7bf5d7 | 789 | SSIP_MSG_ID(cmd), ssi->rxid); |
866dcb9d | 790 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
791 | goto out1; |
792 | } | |
793 | ssi->rxid++; | |
866dcb9d | 794 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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); | |
866dcb9d | 862 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
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 | } | |
866dcb9d | 870 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 | 871 | } else { |
866dcb9d | 872 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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 | } | |
866dcb9d | 889 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
890 | if (list_empty(&ssi->txqueue)) { |
891 | ssip_set_txstate(ssi, SENDING_SWBREAK); | |
866dcb9d | 892 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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 { | |
866dcb9d | 899 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
900 | ssip_xmit(cl); |
901 | } | |
902 | out: | |
903 | ssip_free_data(msg); | |
904 | } | |
905 | ||
0a0ea07d | 906 | static void ssip_port_event(struct hsi_client *cl, unsigned long event) |
dc7bf5d7 SR |
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); | |
6d6c3097 SR |
939 | |
940 | if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) | |
dc7bf5d7 | 941 | ssi_waketest(cl, 1); /* FIXME: To be removed */ |
6d6c3097 SR |
942 | |
943 | spin_lock_bh(&ssi->lock); | |
87d99063 | 944 | ssi->main_state = HANDSHAKE; |
dc7bf5d7 SR |
945 | spin_unlock_bh(&ssi->lock); |
946 | ||
87d99063 SR |
947 | ssip_send_bootinfo_req_cmd(cl); |
948 | ||
dc7bf5d7 SR |
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 | ||
df26d639 SR |
963 | static 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 | ||
dc7bf5d7 SR |
972 | static 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 | /* Pad to 32-bits - FIXME: Revisit*/ | |
982 | if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3))) | |
30260501 | 983 | goto inc_dropped; |
dc7bf5d7 SR |
984 | |
985 | /* | |
986 | * Modem sends Phonet messages over SSI with its own endianess... | |
987 | * Assume that modem has the same endianess as we do. | |
988 | */ | |
989 | if (skb_cow_head(skb, 0)) | |
990 | goto drop; | |
991 | ||
992 | /* length field is exchanged in network byte order */ | |
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 | /* Needed for cmt-speech workaround */ | |
1021 | dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n", | |
1022 | ssi->txqueue_len); | |
1023 | spin_unlock_bh(&ssi->lock); | |
df26d639 | 1024 | schedule_work(&ssi->work); |
dc7bf5d7 SR |
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; | |
1032 | drop2: | |
1033 | hsi_free_msg(msg); | |
1034 | drop: | |
dc7bf5d7 | 1035 | dev_kfree_skb(skb); |
30260501 DC |
1036 | inc_dropped: |
1037 | dev->stats.tx_dropped++; | |
dc7bf5d7 SR |
1038 | |
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | /* CMT reset event handler */ | |
1043 | void 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 | } | |
1049 | EXPORT_SYMBOL_GPL(ssip_reset_event); | |
1050 | ||
1051 | static 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, | |
dc7bf5d7 SR |
1055 | }; |
1056 | ||
1057 | static 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 | ||
ed66e50d | 1069 | dev->needs_free_netdev = true; |
dc7bf5d7 SR |
1070 | dev->header_ops = &phonet_header_ops; |
1071 | } | |
1072 | ||
1073 | static 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; | |
df26d639 | 1101 | INIT_WORK(&ssi->work, ssip_xmit_work); |
dc7bf5d7 SR |
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 | ||
c835a677 | 1123 | ssi->netdev = alloc_netdev(0, ifname, NET_NAME_UNKNOWN, ssip_pn_setup); |
dc7bf5d7 SR |
1124 | if (!ssi->netdev) { |
1125 | dev_err(dev, "No memory for netdev\n"); | |
1126 | err = -ENOMEM; | |
1127 | goto out1; | |
1128 | } | |
1129 | ||
b3e3893e JW |
1130 | /* MTU range: 6 - 65535 */ |
1131 | ssi->netdev->min_mtu = PHONET_MIN_MTU; | |
1132 | ssi->netdev->max_mtu = SSIP_MAX_MTU; | |
1133 | ||
dc7bf5d7 SR |
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; | |
1148 | out2: | |
1149 | free_netdev(ssi->netdev); | |
1150 | out1: | |
1151 | ssip_free_cmds(ssi); | |
1152 | out: | |
1153 | kfree(ssi); | |
1154 | ||
1155 | return err; | |
1156 | } | |
1157 | ||
1158 | static 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 | ||
1172 | static 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 | ||
1181 | static 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 | } | |
1187 | module_init(ssip_init); | |
1188 | ||
1189 | static void __exit ssip_exit(void) | |
1190 | { | |
1191 | hsi_unregister_client_driver(&ssip_driver); | |
1192 | pr_info("SSI protocol driver removed\n"); | |
1193 | } | |
1194 | module_exit(ssip_exit); | |
1195 | ||
1196 | MODULE_ALIAS("hsi:ssi-protocol"); | |
1197 | MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); | |
1198 | MODULE_AUTHOR("Remi Denis-Courmont <remi.denis-courmont@nokia.com>"); | |
1199 | MODULE_DESCRIPTION("SSI protocol improved aka McSAAB"); | |
1200 | MODULE_LICENSE("GPL"); |