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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
dc7bf5d7 SR |
2 | /* |
3 | * ssi_protocol.c | |
4 | * | |
5 | * Implementation of the SSI McSAAB improved protocol. | |
6 | * | |
7 | * Copyright (C) 2010 Nokia Corporation. All rights reserved. | |
8 | * Copyright (C) 2013 Sebastian Reichel <sre@kernel.org> | |
9 | * | |
10 | * Contact: Carlos Chinea <carlos.chinea@nokia.com> | |
dc7bf5d7 SR |
11 | */ |
12 | ||
13 | #include <linux/atomic.h> | |
14 | #include <linux/clk.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/gpio.h> | |
18 | #include <linux/if_ether.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/if_phonet.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/irq.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/notifier.h> | |
27 | #include <linux/scatterlist.h> | |
28 | #include <linux/skbuff.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/hsi/hsi.h> | |
33 | #include <linux/hsi/ssi_protocol.h> | |
34 | ||
35 | void ssi_waketest(struct hsi_client *cl, unsigned int enable); | |
36 | ||
37 | #define SSIP_TXQUEUE_LEN 100 | |
38 | #define SSIP_MAX_MTU 65535 | |
39 | #define SSIP_DEFAULT_MTU 4000 | |
40 | #define PN_MEDIA_SOS 21 | |
41 | #define SSIP_MIN_PN_HDR 6 /* FIXME: Revisit */ | |
42 | #define SSIP_WDTOUT 2000 /* FIXME: has to be 500 msecs */ | |
43 | #define SSIP_KATOUT 15 /* 15 msecs */ | |
44 | #define SSIP_MAX_CMDS 5 /* Number of pre-allocated commands buffers */ | |
45 | #define SSIP_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1) | |
46 | #define SSIP_CMT_LOADER_SYNC 0x11223344 | |
47 | /* | |
48 | * SSI protocol command definitions | |
49 | */ | |
50 | #define SSIP_COMMAND(data) ((data) >> 28) | |
51 | #define SSIP_PAYLOAD(data) ((data) & 0xfffffff) | |
52 | /* Commands */ | |
53 | #define SSIP_SW_BREAK 0 | |
54 | #define SSIP_BOOTINFO_REQ 1 | |
55 | #define SSIP_BOOTINFO_RESP 2 | |
56 | #define SSIP_WAKETEST_RESULT 3 | |
57 | #define SSIP_START_TRANS 4 | |
58 | #define SSIP_READY 5 | |
59 | /* Payloads */ | |
60 | #define SSIP_DATA_VERSION(data) ((data) & 0xff) | |
61 | #define SSIP_LOCAL_VERID 1 | |
62 | #define SSIP_WAKETEST_OK 0 | |
63 | #define SSIP_WAKETEST_FAILED 1 | |
64 | #define SSIP_PDU_LENGTH(data) (((data) >> 8) & 0xffff) | |
65 | #define SSIP_MSG_ID(data) ((data) & 0xff) | |
66 | /* Generic Command */ | |
67 | #define SSIP_CMD(cmd, payload) (((cmd) << 28) | ((payload) & 0xfffffff)) | |
68 | /* Commands for the control channel */ | |
69 | #define SSIP_BOOTINFO_REQ_CMD(ver) \ | |
70 | SSIP_CMD(SSIP_BOOTINFO_REQ, SSIP_DATA_VERSION(ver)) | |
71 | #define SSIP_BOOTINFO_RESP_CMD(ver) \ | |
72 | SSIP_CMD(SSIP_BOOTINFO_RESP, SSIP_DATA_VERSION(ver)) | |
73 | #define SSIP_START_TRANS_CMD(pdulen, id) \ | |
74 | SSIP_CMD(SSIP_START_TRANS, (((pdulen) << 8) | SSIP_MSG_ID(id))) | |
75 | #define SSIP_READY_CMD SSIP_CMD(SSIP_READY, 0) | |
76 | #define SSIP_SWBREAK_CMD SSIP_CMD(SSIP_SW_BREAK, 0) | |
77 | ||
6d6c3097 SR |
78 | #define SSIP_WAKETEST_FLAG 0 |
79 | ||
dc7bf5d7 SR |
80 | /* Main state machine states */ |
81 | enum { | |
82 | INIT, | |
83 | HANDSHAKE, | |
84 | ACTIVE, | |
85 | }; | |
86 | ||
87 | /* Send state machine states */ | |
88 | enum { | |
89 | SEND_IDLE, | |
90 | WAIT4READY, | |
91 | SEND_READY, | |
92 | SENDING, | |
93 | SENDING_SWBREAK, | |
94 | }; | |
95 | ||
96 | /* Receive state machine states */ | |
97 | enum { | |
98 | RECV_IDLE, | |
99 | RECV_READY, | |
100 | RECEIVING, | |
101 | }; | |
102 | ||
103 | /** | |
104 | * struct ssi_protocol - SSI protocol (McSAAB) data | |
105 | * @main_state: Main state machine | |
106 | * @send_state: TX state machine | |
107 | * @recv_state: RX state machine | |
6d6c3097 | 108 | * @flags: Flags, currently only used to follow wake line test |
dc7bf5d7 SR |
109 | * @rxid: RX data id |
110 | * @txid: TX data id | |
111 | * @txqueue_len: TX queue length | |
112 | * @tx_wd: TX watchdog | |
113 | * @rx_wd: RX watchdog | |
114 | * @keep_alive: Workaround for SSI HW bug | |
115 | * @lock: To serialize access to this struct | |
116 | * @netdev: Phonet network device | |
117 | * @txqueue: TX data queue | |
118 | * @cmdqueue: Queue of free commands | |
119 | * @cl: HSI client own reference | |
120 | * @link: Link for ssip_list | |
121 | * @tx_usecount: Refcount to keep track the slaves that use the wake line | |
122 | * @channel_id_cmd: HSI channel id for command stream | |
123 | * @channel_id_data: HSI channel id for data stream | |
124 | */ | |
125 | struct ssi_protocol { | |
126 | unsigned int main_state; | |
127 | unsigned int send_state; | |
128 | unsigned int recv_state; | |
6d6c3097 | 129 | unsigned long flags; |
dc7bf5d7 SR |
130 | u8 rxid; |
131 | u8 txid; | |
132 | unsigned int txqueue_len; | |
133 | struct timer_list tx_wd; | |
134 | struct timer_list rx_wd; | |
135 | struct timer_list keep_alive; /* wake-up workaround */ | |
136 | spinlock_t lock; | |
137 | struct net_device *netdev; | |
138 | struct list_head txqueue; | |
139 | struct list_head cmdqueue; | |
df26d639 | 140 | struct work_struct work; |
dc7bf5d7 SR |
141 | struct hsi_client *cl; |
142 | struct list_head link; | |
143 | atomic_t tx_usecnt; | |
144 | int channel_id_cmd; | |
145 | int channel_id_data; | |
146 | }; | |
147 | ||
148 | /* List of ssi protocol instances */ | |
149 | static LIST_HEAD(ssip_list); | |
150 | ||
151 | static void ssip_rxcmd_complete(struct hsi_msg *msg); | |
152 | ||
153 | static inline void ssip_set_cmd(struct hsi_msg *msg, u32 cmd) | |
154 | { | |
155 | u32 *data; | |
156 | ||
157 | data = sg_virt(msg->sgt.sgl); | |
158 | *data = cmd; | |
159 | } | |
160 | ||
161 | static inline u32 ssip_get_cmd(struct hsi_msg *msg) | |
162 | { | |
163 | u32 *data; | |
164 | ||
165 | data = sg_virt(msg->sgt.sgl); | |
166 | ||
167 | return *data; | |
168 | } | |
169 | ||
170 | static void ssip_skb_to_msg(struct sk_buff *skb, struct hsi_msg *msg) | |
171 | { | |
172 | skb_frag_t *frag; | |
173 | struct scatterlist *sg; | |
174 | int i; | |
175 | ||
176 | BUG_ON(msg->sgt.nents != (unsigned int)(skb_shinfo(skb)->nr_frags + 1)); | |
177 | ||
178 | sg = msg->sgt.sgl; | |
179 | sg_set_buf(sg, skb->data, skb_headlen(skb)); | |
180 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
181 | sg = sg_next(sg); | |
182 | BUG_ON(!sg); | |
183 | frag = &skb_shinfo(skb)->frags[i]; | |
184 | sg_set_page(sg, frag->page.p, frag->size, frag->page_offset); | |
185 | } | |
186 | } | |
187 | ||
188 | static void ssip_free_data(struct hsi_msg *msg) | |
189 | { | |
190 | struct sk_buff *skb; | |
191 | ||
192 | skb = msg->context; | |
193 | pr_debug("free data: msg %p context %p skb %p\n", msg, msg->context, | |
194 | skb); | |
195 | msg->destructor = NULL; | |
196 | dev_kfree_skb(skb); | |
197 | hsi_free_msg(msg); | |
198 | } | |
199 | ||
200 | static struct hsi_msg *ssip_alloc_data(struct ssi_protocol *ssi, | |
201 | struct sk_buff *skb, gfp_t flags) | |
202 | { | |
203 | struct hsi_msg *msg; | |
204 | ||
205 | msg = hsi_alloc_msg(skb_shinfo(skb)->nr_frags + 1, flags); | |
206 | if (!msg) | |
207 | return NULL; | |
208 | ssip_skb_to_msg(skb, msg); | |
209 | msg->destructor = ssip_free_data; | |
210 | msg->channel = ssi->channel_id_data; | |
211 | msg->context = skb; | |
212 | ||
213 | return msg; | |
214 | } | |
215 | ||
216 | static inline void ssip_release_cmd(struct hsi_msg *msg) | |
217 | { | |
218 | struct ssi_protocol *ssi = hsi_client_drvdata(msg->cl); | |
219 | ||
220 | dev_dbg(&msg->cl->device, "Release cmd 0x%08x\n", ssip_get_cmd(msg)); | |
221 | spin_lock_bh(&ssi->lock); | |
222 | list_add_tail(&msg->link, &ssi->cmdqueue); | |
223 | spin_unlock_bh(&ssi->lock); | |
224 | } | |
225 | ||
226 | static struct hsi_msg *ssip_claim_cmd(struct ssi_protocol *ssi) | |
227 | { | |
228 | struct hsi_msg *msg; | |
229 | ||
230 | BUG_ON(list_empty(&ssi->cmdqueue)); | |
231 | ||
232 | spin_lock_bh(&ssi->lock); | |
233 | msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link); | |
234 | list_del(&msg->link); | |
235 | spin_unlock_bh(&ssi->lock); | |
236 | msg->destructor = ssip_release_cmd; | |
237 | ||
238 | return msg; | |
239 | } | |
240 | ||
241 | static void ssip_free_cmds(struct ssi_protocol *ssi) | |
242 | { | |
243 | struct hsi_msg *msg, *tmp; | |
244 | ||
245 | list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) { | |
246 | list_del(&msg->link); | |
247 | msg->destructor = NULL; | |
248 | kfree(sg_virt(msg->sgt.sgl)); | |
249 | hsi_free_msg(msg); | |
250 | } | |
251 | } | |
252 | ||
253 | static int ssip_alloc_cmds(struct ssi_protocol *ssi) | |
254 | { | |
255 | struct hsi_msg *msg; | |
256 | u32 *buf; | |
257 | unsigned int i; | |
258 | ||
259 | for (i = 0; i < SSIP_MAX_CMDS; i++) { | |
260 | msg = hsi_alloc_msg(1, GFP_KERNEL); | |
261 | if (!msg) | |
262 | goto out; | |
263 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
264 | if (!buf) { | |
265 | hsi_free_msg(msg); | |
266 | goto out; | |
267 | } | |
268 | sg_init_one(msg->sgt.sgl, buf, sizeof(*buf)); | |
269 | msg->channel = ssi->channel_id_cmd; | |
270 | list_add_tail(&msg->link, &ssi->cmdqueue); | |
271 | } | |
272 | ||
273 | return 0; | |
274 | out: | |
275 | ssip_free_cmds(ssi); | |
276 | ||
277 | return -ENOMEM; | |
278 | } | |
279 | ||
280 | static void ssip_set_rxstate(struct ssi_protocol *ssi, unsigned int state) | |
281 | { | |
282 | ssi->recv_state = state; | |
283 | switch (state) { | |
284 | case RECV_IDLE: | |
285 | del_timer(&ssi->rx_wd); | |
286 | if (ssi->send_state == SEND_IDLE) | |
287 | del_timer(&ssi->keep_alive); | |
288 | break; | |
289 | case RECV_READY: | |
290 | /* CMT speech workaround */ | |
291 | if (atomic_read(&ssi->tx_usecnt)) | |
292 | break; | |
293 | /* Otherwise fall through */ | |
294 | case RECEIVING: | |
295 | mod_timer(&ssi->keep_alive, jiffies + | |
296 | msecs_to_jiffies(SSIP_KATOUT)); | |
297 | mod_timer(&ssi->rx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); | |
298 | break; | |
299 | default: | |
300 | break; | |
301 | } | |
302 | } | |
303 | ||
304 | static void ssip_set_txstate(struct ssi_protocol *ssi, unsigned int state) | |
305 | { | |
306 | ssi->send_state = state; | |
307 | switch (state) { | |
308 | case SEND_IDLE: | |
309 | case SEND_READY: | |
310 | del_timer(&ssi->tx_wd); | |
311 | if (ssi->recv_state == RECV_IDLE) | |
312 | del_timer(&ssi->keep_alive); | |
313 | break; | |
314 | case WAIT4READY: | |
315 | case SENDING: | |
316 | case SENDING_SWBREAK: | |
317 | mod_timer(&ssi->keep_alive, | |
318 | jiffies + msecs_to_jiffies(SSIP_KATOUT)); | |
319 | mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); | |
320 | break; | |
321 | default: | |
322 | break; | |
323 | } | |
324 | } | |
325 | ||
326 | struct hsi_client *ssip_slave_get_master(struct hsi_client *slave) | |
327 | { | |
328 | struct hsi_client *master = ERR_PTR(-ENODEV); | |
329 | struct ssi_protocol *ssi; | |
330 | ||
331 | list_for_each_entry(ssi, &ssip_list, link) | |
332 | if (slave->device.parent == ssi->cl->device.parent) { | |
333 | master = ssi->cl; | |
334 | break; | |
335 | } | |
336 | ||
337 | return master; | |
338 | } | |
339 | EXPORT_SYMBOL_GPL(ssip_slave_get_master); | |
340 | ||
341 | int ssip_slave_start_tx(struct hsi_client *master) | |
342 | { | |
343 | struct ssi_protocol *ssi = hsi_client_drvdata(master); | |
344 | ||
345 | dev_dbg(&master->device, "start TX %d\n", atomic_read(&ssi->tx_usecnt)); | |
346 | spin_lock_bh(&ssi->lock); | |
347 | if (ssi->send_state == SEND_IDLE) { | |
348 | ssip_set_txstate(ssi, WAIT4READY); | |
349 | hsi_start_tx(master); | |
350 | } | |
351 | spin_unlock_bh(&ssi->lock); | |
352 | atomic_inc(&ssi->tx_usecnt); | |
353 | ||
354 | return 0; | |
355 | } | |
356 | EXPORT_SYMBOL_GPL(ssip_slave_start_tx); | |
357 | ||
358 | int ssip_slave_stop_tx(struct hsi_client *master) | |
359 | { | |
360 | struct ssi_protocol *ssi = hsi_client_drvdata(master); | |
361 | ||
362 | WARN_ON_ONCE(atomic_read(&ssi->tx_usecnt) == 0); | |
363 | ||
364 | if (atomic_dec_and_test(&ssi->tx_usecnt)) { | |
365 | spin_lock_bh(&ssi->lock); | |
366 | if ((ssi->send_state == SEND_READY) || | |
367 | (ssi->send_state == WAIT4READY)) { | |
368 | ssip_set_txstate(ssi, SEND_IDLE); | |
369 | hsi_stop_tx(master); | |
370 | } | |
371 | spin_unlock_bh(&ssi->lock); | |
372 | } | |
373 | dev_dbg(&master->device, "stop TX %d\n", atomic_read(&ssi->tx_usecnt)); | |
374 | ||
375 | return 0; | |
376 | } | |
377 | EXPORT_SYMBOL_GPL(ssip_slave_stop_tx); | |
378 | ||
379 | int ssip_slave_running(struct hsi_client *master) | |
380 | { | |
381 | struct ssi_protocol *ssi = hsi_client_drvdata(master); | |
382 | return netif_running(ssi->netdev); | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(ssip_slave_running); | |
385 | ||
386 | static void ssip_reset(struct hsi_client *cl) | |
387 | { | |
388 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
389 | struct list_head *head, *tmp; | |
390 | struct hsi_msg *msg; | |
391 | ||
392 | if (netif_running(ssi->netdev)) | |
393 | netif_carrier_off(ssi->netdev); | |
394 | hsi_flush(cl); | |
395 | spin_lock_bh(&ssi->lock); | |
396 | if (ssi->send_state != SEND_IDLE) | |
397 | hsi_stop_tx(cl); | |
6d6c3097 SR |
398 | spin_unlock_bh(&ssi->lock); |
399 | if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) | |
400 | ssi_waketest(cl, 0); /* FIXME: To be removed */ | |
401 | spin_lock_bh(&ssi->lock); | |
dc7bf5d7 SR |
402 | del_timer(&ssi->rx_wd); |
403 | del_timer(&ssi->tx_wd); | |
404 | del_timer(&ssi->keep_alive); | |
405 | ssi->main_state = 0; | |
406 | ssi->send_state = 0; | |
407 | ssi->recv_state = 0; | |
6d6c3097 | 408 | ssi->flags = 0; |
dc7bf5d7 SR |
409 | ssi->rxid = 0; |
410 | ssi->txid = 0; | |
411 | list_for_each_safe(head, tmp, &ssi->txqueue) { | |
412 | msg = list_entry(head, struct hsi_msg, link); | |
413 | dev_dbg(&cl->device, "Pending TX data\n"); | |
414 | list_del(head); | |
415 | ssip_free_data(msg); | |
416 | } | |
417 | ssi->txqueue_len = 0; | |
418 | spin_unlock_bh(&ssi->lock); | |
419 | } | |
420 | ||
421 | static void ssip_dump_state(struct hsi_client *cl) | |
422 | { | |
423 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
424 | struct hsi_msg *msg; | |
425 | ||
426 | spin_lock_bh(&ssi->lock); | |
427 | dev_err(&cl->device, "Main state: %d\n", ssi->main_state); | |
428 | dev_err(&cl->device, "Recv state: %d\n", ssi->recv_state); | |
429 | dev_err(&cl->device, "Send state: %d\n", ssi->send_state); | |
430 | dev_err(&cl->device, "CMT %s\n", (ssi->main_state == ACTIVE) ? | |
431 | "Online" : "Offline"); | |
6d6c3097 SR |
432 | dev_err(&cl->device, "Wake test %d\n", |
433 | test_bit(SSIP_WAKETEST_FLAG, &ssi->flags)); | |
dc7bf5d7 SR |
434 | dev_err(&cl->device, "Data RX id: %d\n", ssi->rxid); |
435 | dev_err(&cl->device, "Data TX id: %d\n", ssi->txid); | |
436 | ||
437 | list_for_each_entry(msg, &ssi->txqueue, link) | |
438 | dev_err(&cl->device, "pending TX data (%p)\n", msg); | |
439 | spin_unlock_bh(&ssi->lock); | |
440 | } | |
441 | ||
442 | static void ssip_error(struct hsi_client *cl) | |
443 | { | |
444 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
445 | struct hsi_msg *msg; | |
446 | ||
447 | ssip_dump_state(cl); | |
448 | ssip_reset(cl); | |
449 | msg = ssip_claim_cmd(ssi); | |
450 | msg->complete = ssip_rxcmd_complete; | |
451 | hsi_async_read(cl, msg); | |
452 | } | |
453 | ||
df7e828c | 454 | static void ssip_keep_alive(struct timer_list *t) |
dc7bf5d7 | 455 | { |
df7e828c KC |
456 | struct ssi_protocol *ssi = from_timer(ssi, t, keep_alive); |
457 | struct hsi_client *cl = ssi->cl; | |
dc7bf5d7 SR |
458 | |
459 | dev_dbg(&cl->device, "Keep alive kick in: m(%d) r(%d) s(%d)\n", | |
460 | ssi->main_state, ssi->recv_state, ssi->send_state); | |
461 | ||
462 | spin_lock(&ssi->lock); | |
463 | if (ssi->recv_state == RECV_IDLE) | |
464 | switch (ssi->send_state) { | |
465 | case SEND_READY: | |
466 | if (atomic_read(&ssi->tx_usecnt) == 0) | |
467 | break; | |
468 | /* | |
469 | * Fall through. Workaround for cmt-speech | |
470 | * in that case we relay on audio timers. | |
471 | */ | |
472 | case SEND_IDLE: | |
473 | spin_unlock(&ssi->lock); | |
474 | return; | |
475 | } | |
476 | mod_timer(&ssi->keep_alive, jiffies + msecs_to_jiffies(SSIP_KATOUT)); | |
477 | spin_unlock(&ssi->lock); | |
478 | } | |
479 | ||
df7e828c KC |
480 | static void ssip_rx_wd(struct timer_list *t) |
481 | { | |
482 | struct ssi_protocol *ssi = from_timer(ssi, t, rx_wd); | |
483 | struct hsi_client *cl = ssi->cl; | |
484 | ||
852041d1 | 485 | dev_err(&cl->device, "Watchdog triggered\n"); |
df7e828c KC |
486 | ssip_error(cl); |
487 | } | |
488 | ||
6ac35264 | 489 | static void ssip_tx_wd(struct timer_list *t) |
dc7bf5d7 | 490 | { |
df7e828c KC |
491 | struct ssi_protocol *ssi = from_timer(ssi, t, tx_wd); |
492 | struct hsi_client *cl = ssi->cl; | |
dc7bf5d7 | 493 | |
852041d1 | 494 | dev_err(&cl->device, "Watchdog triggered\n"); |
dc7bf5d7 SR |
495 | ssip_error(cl); |
496 | } | |
497 | ||
498 | static void ssip_send_bootinfo_req_cmd(struct hsi_client *cl) | |
499 | { | |
500 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
501 | struct hsi_msg *msg; | |
502 | ||
503 | dev_dbg(&cl->device, "Issuing BOOT INFO REQ command\n"); | |
504 | msg = ssip_claim_cmd(ssi); | |
505 | ssip_set_cmd(msg, SSIP_BOOTINFO_REQ_CMD(SSIP_LOCAL_VERID)); | |
506 | msg->complete = ssip_release_cmd; | |
507 | hsi_async_write(cl, msg); | |
508 | dev_dbg(&cl->device, "Issuing RX command\n"); | |
509 | msg = ssip_claim_cmd(ssi); | |
510 | msg->complete = ssip_rxcmd_complete; | |
511 | hsi_async_read(cl, msg); | |
512 | } | |
513 | ||
514 | static void ssip_start_rx(struct hsi_client *cl) | |
515 | { | |
516 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
517 | struct hsi_msg *msg; | |
518 | ||
519 | dev_dbg(&cl->device, "RX start M(%d) R(%d)\n", ssi->main_state, | |
520 | ssi->recv_state); | |
866dcb9d | 521 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
522 | /* |
523 | * We can have two UP events in a row due to a short low | |
524 | * high transition. Therefore we need to ignore the sencond UP event. | |
525 | */ | |
526 | if ((ssi->main_state != ACTIVE) || (ssi->recv_state == RECV_READY)) { | |
866dcb9d | 527 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
528 | return; |
529 | } | |
530 | ssip_set_rxstate(ssi, RECV_READY); | |
866dcb9d | 531 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
532 | |
533 | msg = ssip_claim_cmd(ssi); | |
534 | ssip_set_cmd(msg, SSIP_READY_CMD); | |
535 | msg->complete = ssip_release_cmd; | |
536 | dev_dbg(&cl->device, "Send READY\n"); | |
537 | hsi_async_write(cl, msg); | |
538 | } | |
539 | ||
540 | static void ssip_stop_rx(struct hsi_client *cl) | |
541 | { | |
542 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
543 | ||
544 | dev_dbg(&cl->device, "RX stop M(%d)\n", ssi->main_state); | |
866dcb9d | 545 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
546 | if (likely(ssi->main_state == ACTIVE)) |
547 | ssip_set_rxstate(ssi, RECV_IDLE); | |
866dcb9d | 548 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
549 | } |
550 | ||
551 | static void ssip_free_strans(struct hsi_msg *msg) | |
552 | { | |
553 | ssip_free_data(msg->context); | |
554 | ssip_release_cmd(msg); | |
555 | } | |
556 | ||
557 | static void ssip_strans_complete(struct hsi_msg *msg) | |
558 | { | |
559 | struct hsi_client *cl = msg->cl; | |
560 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
561 | struct hsi_msg *data; | |
562 | ||
563 | data = msg->context; | |
564 | ssip_release_cmd(msg); | |
866dcb9d | 565 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 | 566 | ssip_set_txstate(ssi, SENDING); |
866dcb9d | 567 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
568 | hsi_async_write(cl, data); |
569 | } | |
570 | ||
571 | static int ssip_xmit(struct hsi_client *cl) | |
572 | { | |
573 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
574 | struct hsi_msg *msg, *dmsg; | |
575 | struct sk_buff *skb; | |
576 | ||
577 | spin_lock_bh(&ssi->lock); | |
578 | if (list_empty(&ssi->txqueue)) { | |
579 | spin_unlock_bh(&ssi->lock); | |
580 | return 0; | |
581 | } | |
582 | dmsg = list_first_entry(&ssi->txqueue, struct hsi_msg, link); | |
583 | list_del(&dmsg->link); | |
584 | ssi->txqueue_len--; | |
585 | spin_unlock_bh(&ssi->lock); | |
586 | ||
587 | msg = ssip_claim_cmd(ssi); | |
588 | skb = dmsg->context; | |
589 | msg->context = dmsg; | |
590 | msg->complete = ssip_strans_complete; | |
591 | msg->destructor = ssip_free_strans; | |
592 | ||
593 | spin_lock_bh(&ssi->lock); | |
594 | ssip_set_cmd(msg, SSIP_START_TRANS_CMD(SSIP_BYTES_TO_FRAMES(skb->len), | |
595 | ssi->txid)); | |
596 | ssi->txid++; | |
597 | ssip_set_txstate(ssi, SENDING); | |
598 | spin_unlock_bh(&ssi->lock); | |
599 | ||
600 | dev_dbg(&cl->device, "Send STRANS (%d frames)\n", | |
601 | SSIP_BYTES_TO_FRAMES(skb->len)); | |
602 | ||
603 | return hsi_async_write(cl, msg); | |
604 | } | |
605 | ||
606 | /* In soft IRQ context */ | |
607 | static void ssip_pn_rx(struct sk_buff *skb) | |
608 | { | |
609 | struct net_device *dev = skb->dev; | |
610 | ||
611 | if (unlikely(!netif_running(dev))) { | |
612 | dev_dbg(&dev->dev, "Drop RX packet\n"); | |
613 | dev->stats.rx_dropped++; | |
614 | dev_kfree_skb(skb); | |
615 | return; | |
616 | } | |
617 | if (unlikely(!pskb_may_pull(skb, SSIP_MIN_PN_HDR))) { | |
618 | dev_dbg(&dev->dev, "Error drop RX packet\n"); | |
619 | dev->stats.rx_errors++; | |
620 | dev->stats.rx_length_errors++; | |
621 | dev_kfree_skb(skb); | |
622 | return; | |
623 | } | |
624 | dev->stats.rx_packets++; | |
625 | dev->stats.rx_bytes += skb->len; | |
626 | ||
627 | /* length field is exchanged in network byte order */ | |
628 | ((u16 *)skb->data)[2] = ntohs(((u16 *)skb->data)[2]); | |
629 | dev_dbg(&dev->dev, "RX length fixed (%04x -> %u)\n", | |
630 | ((u16 *)skb->data)[2], ntohs(((u16 *)skb->data)[2])); | |
631 | ||
632 | skb->protocol = htons(ETH_P_PHONET); | |
633 | skb_reset_mac_header(skb); | |
634 | __skb_pull(skb, 1); | |
635 | netif_rx(skb); | |
636 | } | |
637 | ||
638 | static void ssip_rx_data_complete(struct hsi_msg *msg) | |
639 | { | |
640 | struct hsi_client *cl = msg->cl; | |
641 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
642 | struct sk_buff *skb; | |
643 | ||
644 | if (msg->status == HSI_STATUS_ERROR) { | |
645 | dev_err(&cl->device, "RX data error\n"); | |
646 | ssip_free_data(msg); | |
647 | ssip_error(cl); | |
648 | return; | |
649 | } | |
650 | del_timer(&ssi->rx_wd); /* FIXME: Revisit */ | |
651 | skb = msg->context; | |
652 | ssip_pn_rx(skb); | |
653 | hsi_free_msg(msg); | |
654 | } | |
655 | ||
656 | static void ssip_rx_bootinforeq(struct hsi_client *cl, u32 cmd) | |
657 | { | |
658 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
659 | struct hsi_msg *msg; | |
660 | ||
661 | /* Workaroud: Ignore CMT Loader message leftover */ | |
662 | if (cmd == SSIP_CMT_LOADER_SYNC) | |
663 | return; | |
664 | ||
665 | switch (ssi->main_state) { | |
666 | case ACTIVE: | |
667 | dev_err(&cl->device, "Boot info req on active state\n"); | |
668 | ssip_error(cl); | |
669 | /* Fall through */ | |
670 | case INIT: | |
87d99063 | 671 | case HANDSHAKE: |
866dcb9d | 672 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 | 673 | ssi->main_state = HANDSHAKE; |
866dcb9d | 674 | spin_unlock_bh(&ssi->lock); |
6d6c3097 SR |
675 | |
676 | if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) | |
dc7bf5d7 | 677 | ssi_waketest(cl, 1); /* FIXME: To be removed */ |
6d6c3097 | 678 | |
866dcb9d | 679 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
680 | /* Start boot handshake watchdog */ |
681 | mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); | |
866dcb9d | 682 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
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; | |
dc7bf5d7 SR |
691 | default: |
692 | dev_dbg(&cl->device, "Wrong state M(%d)\n", ssi->main_state); | |
693 | break; | |
694 | } | |
695 | } | |
696 | ||
697 | static void ssip_rx_bootinforesp(struct hsi_client *cl, u32 cmd) | |
698 | { | |
699 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
700 | ||
701 | if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID) | |
702 | dev_warn(&cl->device, "boot info resp verid mismatch\n"); | |
703 | ||
866dcb9d | 704 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
705 | if (ssi->main_state != ACTIVE) |
706 | /* Use tx_wd as a boot watchdog in non ACTIVE state */ | |
707 | mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); | |
708 | else | |
709 | dev_dbg(&cl->device, "boot info resp ignored M(%d)\n", | |
710 | ssi->main_state); | |
866dcb9d | 711 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
712 | } |
713 | ||
714 | static void ssip_rx_waketest(struct hsi_client *cl, u32 cmd) | |
715 | { | |
716 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
717 | unsigned int wkres = SSIP_PAYLOAD(cmd); | |
718 | ||
866dcb9d | 719 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
720 | if (ssi->main_state != HANDSHAKE) { |
721 | dev_dbg(&cl->device, "wake lines test ignored M(%d)\n", | |
722 | ssi->main_state); | |
866dcb9d | 723 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
724 | return; |
725 | } | |
866dcb9d | 726 | spin_unlock_bh(&ssi->lock); |
6d6c3097 SR |
727 | |
728 | if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) | |
dc7bf5d7 | 729 | ssi_waketest(cl, 0); /* FIXME: To be removed */ |
6d6c3097 | 730 | |
866dcb9d | 731 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
732 | ssi->main_state = ACTIVE; |
733 | del_timer(&ssi->tx_wd); /* Stop boot handshake timer */ | |
866dcb9d | 734 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
735 | |
736 | dev_notice(&cl->device, "WAKELINES TEST %s\n", | |
737 | wkres & SSIP_WAKETEST_FAILED ? "FAILED" : "OK"); | |
738 | if (wkres & SSIP_WAKETEST_FAILED) { | |
739 | ssip_error(cl); | |
740 | return; | |
741 | } | |
742 | dev_dbg(&cl->device, "CMT is ONLINE\n"); | |
743 | netif_wake_queue(ssi->netdev); | |
744 | netif_carrier_on(ssi->netdev); | |
745 | } | |
746 | ||
747 | static void ssip_rx_ready(struct hsi_client *cl) | |
748 | { | |
749 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
750 | ||
866dcb9d | 751 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
752 | if (unlikely(ssi->main_state != ACTIVE)) { |
753 | dev_dbg(&cl->device, "READY on wrong state: S(%d) M(%d)\n", | |
754 | ssi->send_state, ssi->main_state); | |
866dcb9d | 755 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
756 | return; |
757 | } | |
758 | if (ssi->send_state != WAIT4READY) { | |
759 | dev_dbg(&cl->device, "Ignore spurious READY command\n"); | |
866dcb9d | 760 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
761 | return; |
762 | } | |
763 | ssip_set_txstate(ssi, SEND_READY); | |
866dcb9d | 764 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
765 | ssip_xmit(cl); |
766 | } | |
767 | ||
768 | static void ssip_rx_strans(struct hsi_client *cl, u32 cmd) | |
769 | { | |
770 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
771 | struct sk_buff *skb; | |
772 | struct hsi_msg *msg; | |
773 | int len = SSIP_PDU_LENGTH(cmd); | |
774 | ||
775 | dev_dbg(&cl->device, "RX strans: %d frames\n", len); | |
866dcb9d | 776 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
777 | if (unlikely(ssi->main_state != ACTIVE)) { |
778 | dev_err(&cl->device, "START TRANS wrong state: S(%d) M(%d)\n", | |
779 | ssi->send_state, ssi->main_state); | |
866dcb9d | 780 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
781 | return; |
782 | } | |
783 | ssip_set_rxstate(ssi, RECEIVING); | |
784 | if (unlikely(SSIP_MSG_ID(cmd) != ssi->rxid)) { | |
c616ac28 | 785 | dev_err(&cl->device, "START TRANS id %d expected %d\n", |
dc7bf5d7 | 786 | SSIP_MSG_ID(cmd), ssi->rxid); |
866dcb9d | 787 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
788 | goto out1; |
789 | } | |
790 | ssi->rxid++; | |
866dcb9d | 791 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
792 | skb = netdev_alloc_skb(ssi->netdev, len * 4); |
793 | if (unlikely(!skb)) { | |
794 | dev_err(&cl->device, "No memory for rx skb\n"); | |
795 | goto out1; | |
796 | } | |
797 | skb->dev = ssi->netdev; | |
798 | skb_put(skb, len * 4); | |
799 | msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC); | |
800 | if (unlikely(!msg)) { | |
801 | dev_err(&cl->device, "No memory for RX data msg\n"); | |
802 | goto out2; | |
803 | } | |
804 | msg->complete = ssip_rx_data_complete; | |
805 | hsi_async_read(cl, msg); | |
806 | ||
807 | return; | |
808 | out2: | |
809 | dev_kfree_skb(skb); | |
810 | out1: | |
811 | ssip_error(cl); | |
812 | } | |
813 | ||
814 | static void ssip_rxcmd_complete(struct hsi_msg *msg) | |
815 | { | |
816 | struct hsi_client *cl = msg->cl; | |
817 | u32 cmd = ssip_get_cmd(msg); | |
818 | unsigned int cmdid = SSIP_COMMAND(cmd); | |
819 | ||
820 | if (msg->status == HSI_STATUS_ERROR) { | |
821 | dev_err(&cl->device, "RX error detected\n"); | |
822 | ssip_release_cmd(msg); | |
823 | ssip_error(cl); | |
824 | return; | |
825 | } | |
826 | hsi_async_read(cl, msg); | |
827 | dev_dbg(&cl->device, "RX cmd: 0x%08x\n", cmd); | |
828 | switch (cmdid) { | |
829 | case SSIP_SW_BREAK: | |
830 | /* Ignored */ | |
831 | break; | |
832 | case SSIP_BOOTINFO_REQ: | |
833 | ssip_rx_bootinforeq(cl, cmd); | |
834 | break; | |
835 | case SSIP_BOOTINFO_RESP: | |
836 | ssip_rx_bootinforesp(cl, cmd); | |
837 | break; | |
838 | case SSIP_WAKETEST_RESULT: | |
839 | ssip_rx_waketest(cl, cmd); | |
840 | break; | |
841 | case SSIP_START_TRANS: | |
842 | ssip_rx_strans(cl, cmd); | |
843 | break; | |
844 | case SSIP_READY: | |
845 | ssip_rx_ready(cl); | |
846 | break; | |
847 | default: | |
848 | dev_warn(&cl->device, "command 0x%08x not supported\n", cmd); | |
849 | break; | |
850 | } | |
851 | } | |
852 | ||
853 | static void ssip_swbreak_complete(struct hsi_msg *msg) | |
854 | { | |
855 | struct hsi_client *cl = msg->cl; | |
856 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
857 | ||
858 | ssip_release_cmd(msg); | |
866dcb9d | 859 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
860 | if (list_empty(&ssi->txqueue)) { |
861 | if (atomic_read(&ssi->tx_usecnt)) { | |
862 | ssip_set_txstate(ssi, SEND_READY); | |
863 | } else { | |
864 | ssip_set_txstate(ssi, SEND_IDLE); | |
865 | hsi_stop_tx(cl); | |
866 | } | |
866dcb9d | 867 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 | 868 | } else { |
866dcb9d | 869 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
870 | ssip_xmit(cl); |
871 | } | |
872 | netif_wake_queue(ssi->netdev); | |
873 | } | |
874 | ||
875 | static void ssip_tx_data_complete(struct hsi_msg *msg) | |
876 | { | |
877 | struct hsi_client *cl = msg->cl; | |
878 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
879 | struct hsi_msg *cmsg; | |
880 | ||
881 | if (msg->status == HSI_STATUS_ERROR) { | |
882 | dev_err(&cl->device, "TX data error\n"); | |
883 | ssip_error(cl); | |
884 | goto out; | |
885 | } | |
866dcb9d | 886 | spin_lock_bh(&ssi->lock); |
dc7bf5d7 SR |
887 | if (list_empty(&ssi->txqueue)) { |
888 | ssip_set_txstate(ssi, SENDING_SWBREAK); | |
866dcb9d | 889 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
890 | cmsg = ssip_claim_cmd(ssi); |
891 | ssip_set_cmd(cmsg, SSIP_SWBREAK_CMD); | |
892 | cmsg->complete = ssip_swbreak_complete; | |
893 | dev_dbg(&cl->device, "Send SWBREAK\n"); | |
894 | hsi_async_write(cl, cmsg); | |
895 | } else { | |
866dcb9d | 896 | spin_unlock_bh(&ssi->lock); |
dc7bf5d7 SR |
897 | ssip_xmit(cl); |
898 | } | |
899 | out: | |
900 | ssip_free_data(msg); | |
901 | } | |
902 | ||
0a0ea07d | 903 | static void ssip_port_event(struct hsi_client *cl, unsigned long event) |
dc7bf5d7 SR |
904 | { |
905 | switch (event) { | |
906 | case HSI_EVENT_START_RX: | |
907 | ssip_start_rx(cl); | |
908 | break; | |
909 | case HSI_EVENT_STOP_RX: | |
910 | ssip_stop_rx(cl); | |
911 | break; | |
912 | default: | |
913 | return; | |
914 | } | |
915 | } | |
916 | ||
917 | static int ssip_pn_open(struct net_device *dev) | |
918 | { | |
919 | struct hsi_client *cl = to_hsi_client(dev->dev.parent); | |
920 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
921 | int err; | |
922 | ||
923 | err = hsi_claim_port(cl, 1); | |
924 | if (err < 0) { | |
925 | dev_err(&cl->device, "SSI port already claimed\n"); | |
926 | return err; | |
927 | } | |
928 | err = hsi_register_port_event(cl, ssip_port_event); | |
929 | if (err < 0) { | |
930 | dev_err(&cl->device, "Register HSI port event failed (%d)\n", | |
931 | err); | |
932 | return err; | |
933 | } | |
934 | dev_dbg(&cl->device, "Configuring SSI port\n"); | |
935 | hsi_setup(cl); | |
6d6c3097 SR |
936 | |
937 | if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) | |
dc7bf5d7 | 938 | ssi_waketest(cl, 1); /* FIXME: To be removed */ |
6d6c3097 SR |
939 | |
940 | spin_lock_bh(&ssi->lock); | |
87d99063 | 941 | ssi->main_state = HANDSHAKE; |
dc7bf5d7 SR |
942 | spin_unlock_bh(&ssi->lock); |
943 | ||
87d99063 SR |
944 | ssip_send_bootinfo_req_cmd(cl); |
945 | ||
dc7bf5d7 SR |
946 | return 0; |
947 | } | |
948 | ||
949 | static int ssip_pn_stop(struct net_device *dev) | |
950 | { | |
951 | struct hsi_client *cl = to_hsi_client(dev->dev.parent); | |
952 | ||
953 | ssip_reset(cl); | |
954 | hsi_unregister_port_event(cl); | |
955 | hsi_release_port(cl); | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
df26d639 SR |
960 | static void ssip_xmit_work(struct work_struct *work) |
961 | { | |
962 | struct ssi_protocol *ssi = | |
963 | container_of(work, struct ssi_protocol, work); | |
964 | struct hsi_client *cl = ssi->cl; | |
965 | ||
966 | ssip_xmit(cl); | |
967 | } | |
968 | ||
dc7bf5d7 SR |
969 | static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev) |
970 | { | |
971 | struct hsi_client *cl = to_hsi_client(dev->dev.parent); | |
972 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
973 | struct hsi_msg *msg; | |
974 | ||
975 | if ((skb->protocol != htons(ETH_P_PHONET)) || | |
976 | (skb->len < SSIP_MIN_PN_HDR)) | |
977 | goto drop; | |
978 | /* Pad to 32-bits - FIXME: Revisit*/ | |
979 | if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3))) | |
30260501 | 980 | goto inc_dropped; |
dc7bf5d7 SR |
981 | |
982 | /* | |
80fb8a85 ME |
983 | * Modem sends Phonet messages over SSI with its own endianness. |
984 | * Assume that modem has the same endianness as we do. | |
dc7bf5d7 SR |
985 | */ |
986 | if (skb_cow_head(skb, 0)) | |
987 | goto drop; | |
988 | ||
989 | /* length field is exchanged in network byte order */ | |
990 | ((u16 *)skb->data)[2] = htons(((u16 *)skb->data)[2]); | |
991 | ||
992 | msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC); | |
993 | if (!msg) { | |
994 | dev_dbg(&cl->device, "Dropping tx data: No memory\n"); | |
995 | goto drop; | |
996 | } | |
997 | msg->complete = ssip_tx_data_complete; | |
998 | ||
999 | spin_lock_bh(&ssi->lock); | |
1000 | if (unlikely(ssi->main_state != ACTIVE)) { | |
1001 | spin_unlock_bh(&ssi->lock); | |
1002 | dev_dbg(&cl->device, "Dropping tx data: CMT is OFFLINE\n"); | |
1003 | goto drop2; | |
1004 | } | |
1005 | list_add_tail(&msg->link, &ssi->txqueue); | |
1006 | ssi->txqueue_len++; | |
1007 | if (dev->tx_queue_len < ssi->txqueue_len) { | |
1008 | dev_info(&cl->device, "TX queue full %d\n", ssi->txqueue_len); | |
1009 | netif_stop_queue(dev); | |
1010 | } | |
1011 | if (ssi->send_state == SEND_IDLE) { | |
1012 | ssip_set_txstate(ssi, WAIT4READY); | |
1013 | spin_unlock_bh(&ssi->lock); | |
1014 | dev_dbg(&cl->device, "Start TX qlen %d\n", ssi->txqueue_len); | |
1015 | hsi_start_tx(cl); | |
1016 | } else if (ssi->send_state == SEND_READY) { | |
1017 | /* Needed for cmt-speech workaround */ | |
1018 | dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n", | |
1019 | ssi->txqueue_len); | |
1020 | spin_unlock_bh(&ssi->lock); | |
df26d639 | 1021 | schedule_work(&ssi->work); |
dc7bf5d7 SR |
1022 | } else { |
1023 | spin_unlock_bh(&ssi->lock); | |
1024 | } | |
1025 | dev->stats.tx_packets++; | |
1026 | dev->stats.tx_bytes += skb->len; | |
1027 | ||
1028 | return 0; | |
1029 | drop2: | |
1030 | hsi_free_msg(msg); | |
1031 | drop: | |
dc7bf5d7 | 1032 | dev_kfree_skb(skb); |
30260501 DC |
1033 | inc_dropped: |
1034 | dev->stats.tx_dropped++; | |
dc7bf5d7 SR |
1035 | |
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | /* CMT reset event handler */ | |
1040 | void ssip_reset_event(struct hsi_client *master) | |
1041 | { | |
1042 | struct ssi_protocol *ssi = hsi_client_drvdata(master); | |
1043 | dev_err(&ssi->cl->device, "CMT reset detected!\n"); | |
1044 | ssip_error(ssi->cl); | |
1045 | } | |
1046 | EXPORT_SYMBOL_GPL(ssip_reset_event); | |
1047 | ||
1048 | static const struct net_device_ops ssip_pn_ops = { | |
1049 | .ndo_open = ssip_pn_open, | |
1050 | .ndo_stop = ssip_pn_stop, | |
1051 | .ndo_start_xmit = ssip_pn_xmit, | |
dc7bf5d7 SR |
1052 | }; |
1053 | ||
1054 | static void ssip_pn_setup(struct net_device *dev) | |
1055 | { | |
1056 | dev->features = 0; | |
1057 | dev->netdev_ops = &ssip_pn_ops; | |
1058 | dev->type = ARPHRD_PHONET; | |
1059 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
1060 | dev->mtu = SSIP_DEFAULT_MTU; | |
1061 | dev->hard_header_len = 1; | |
1062 | dev->dev_addr[0] = PN_MEDIA_SOS; | |
1063 | dev->addr_len = 1; | |
1064 | dev->tx_queue_len = SSIP_TXQUEUE_LEN; | |
1065 | ||
ed66e50d | 1066 | dev->needs_free_netdev = true; |
dc7bf5d7 SR |
1067 | dev->header_ops = &phonet_header_ops; |
1068 | } | |
1069 | ||
1070 | static int ssi_protocol_probe(struct device *dev) | |
1071 | { | |
1072 | static const char ifname[] = "phonet%d"; | |
1073 | struct hsi_client *cl = to_hsi_client(dev); | |
1074 | struct ssi_protocol *ssi; | |
1075 | int err; | |
1076 | ||
1077 | ssi = kzalloc(sizeof(*ssi), GFP_KERNEL); | |
2d8236d1 | 1078 | if (!ssi) |
dc7bf5d7 | 1079 | return -ENOMEM; |
dc7bf5d7 SR |
1080 | |
1081 | spin_lock_init(&ssi->lock); | |
df7e828c KC |
1082 | timer_setup(&ssi->rx_wd, ssip_rx_wd, TIMER_DEFERRABLE); |
1083 | timer_setup(&ssi->tx_wd, ssip_tx_wd, TIMER_DEFERRABLE); | |
1084 | timer_setup(&ssi->keep_alive, ssip_keep_alive, 0); | |
dc7bf5d7 SR |
1085 | INIT_LIST_HEAD(&ssi->txqueue); |
1086 | INIT_LIST_HEAD(&ssi->cmdqueue); | |
1087 | atomic_set(&ssi->tx_usecnt, 0); | |
1088 | hsi_client_set_drvdata(cl, ssi); | |
1089 | ssi->cl = cl; | |
df26d639 | 1090 | INIT_WORK(&ssi->work, ssip_xmit_work); |
dc7bf5d7 SR |
1091 | |
1092 | ssi->channel_id_cmd = hsi_get_channel_id_by_name(cl, "mcsaab-control"); | |
1093 | if (ssi->channel_id_cmd < 0) { | |
1094 | err = ssi->channel_id_cmd; | |
1095 | dev_err(dev, "Could not get cmd channel (%d)\n", err); | |
1096 | goto out; | |
1097 | } | |
1098 | ||
1099 | ssi->channel_id_data = hsi_get_channel_id_by_name(cl, "mcsaab-data"); | |
1100 | if (ssi->channel_id_data < 0) { | |
1101 | err = ssi->channel_id_data; | |
1102 | dev_err(dev, "Could not get data channel (%d)\n", err); | |
1103 | goto out; | |
1104 | } | |
1105 | ||
1106 | err = ssip_alloc_cmds(ssi); | |
1107 | if (err < 0) { | |
1108 | dev_err(dev, "No memory for commands\n"); | |
1109 | goto out; | |
1110 | } | |
1111 | ||
c835a677 | 1112 | ssi->netdev = alloc_netdev(0, ifname, NET_NAME_UNKNOWN, ssip_pn_setup); |
dc7bf5d7 SR |
1113 | if (!ssi->netdev) { |
1114 | dev_err(dev, "No memory for netdev\n"); | |
1115 | err = -ENOMEM; | |
1116 | goto out1; | |
1117 | } | |
1118 | ||
b3e3893e JW |
1119 | /* MTU range: 6 - 65535 */ |
1120 | ssi->netdev->min_mtu = PHONET_MIN_MTU; | |
1121 | ssi->netdev->max_mtu = SSIP_MAX_MTU; | |
1122 | ||
dc7bf5d7 SR |
1123 | SET_NETDEV_DEV(ssi->netdev, dev); |
1124 | netif_carrier_off(ssi->netdev); | |
1125 | err = register_netdev(ssi->netdev); | |
1126 | if (err < 0) { | |
1127 | dev_err(dev, "Register netdev failed (%d)\n", err); | |
1128 | goto out2; | |
1129 | } | |
1130 | ||
1131 | list_add(&ssi->link, &ssip_list); | |
1132 | ||
1133 | dev_dbg(dev, "channel configuration: cmd=%d, data=%d\n", | |
1134 | ssi->channel_id_cmd, ssi->channel_id_data); | |
1135 | ||
1136 | return 0; | |
1137 | out2: | |
1138 | free_netdev(ssi->netdev); | |
1139 | out1: | |
1140 | ssip_free_cmds(ssi); | |
1141 | out: | |
1142 | kfree(ssi); | |
1143 | ||
1144 | return err; | |
1145 | } | |
1146 | ||
1147 | static int ssi_protocol_remove(struct device *dev) | |
1148 | { | |
1149 | struct hsi_client *cl = to_hsi_client(dev); | |
1150 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); | |
1151 | ||
1152 | list_del(&ssi->link); | |
1153 | unregister_netdev(ssi->netdev); | |
1154 | ssip_free_cmds(ssi); | |
1155 | hsi_client_set_drvdata(cl, NULL); | |
1156 | kfree(ssi); | |
1157 | ||
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | static struct hsi_client_driver ssip_driver = { | |
1162 | .driver = { | |
1163 | .name = "ssi-protocol", | |
1164 | .owner = THIS_MODULE, | |
1165 | .probe = ssi_protocol_probe, | |
1166 | .remove = ssi_protocol_remove, | |
1167 | }, | |
1168 | }; | |
1169 | ||
1170 | static int __init ssip_init(void) | |
1171 | { | |
1172 | pr_info("SSI protocol aka McSAAB added\n"); | |
1173 | ||
1174 | return hsi_register_client_driver(&ssip_driver); | |
1175 | } | |
1176 | module_init(ssip_init); | |
1177 | ||
1178 | static void __exit ssip_exit(void) | |
1179 | { | |
1180 | hsi_unregister_client_driver(&ssip_driver); | |
1181 | pr_info("SSI protocol driver removed\n"); | |
1182 | } | |
1183 | module_exit(ssip_exit); | |
1184 | ||
1185 | MODULE_ALIAS("hsi:ssi-protocol"); | |
1186 | MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); | |
1187 | MODULE_AUTHOR("Remi Denis-Courmont <remi.denis-courmont@nokia.com>"); | |
1188 | MODULE_DESCRIPTION("SSI protocol improved aka McSAAB"); | |
1189 | MODULE_LICENSE("GPL"); |