1 /*
2 * SVC Greybus driver.
3 *
4 * Copyright 2015 Google Inc.
5 * Copyright 2015 Linaro Ltd.
6 *
7 * Released under the GPLv2 only.
8 */
9
10 #include <linux/debugfs.h>
11 #include <linux/workqueue.h>
12
13 #include "greybus.h"
14
15 #define SVC_INTF_EJECT_TIMEOUT 9000
16 #define SVC_INTF_ACTIVATE_TIMEOUT 6000
17 #define SVC_INTF_RESUME_TIMEOUT 3000
18
19 struct gb_svc_deferred_request {
20 struct work_struct work;
21 struct gb_operation *operation;
22 };
23
24
25 static int gb_svc_queue_deferred_request(struct gb_operation *operation);
26
endo_id_show(struct device * dev,struct device_attribute * attr,char * buf)27 static ssize_t endo_id_show(struct device *dev,
28 struct device_attribute *attr, char *buf)
29 {
30 struct gb_svc *svc = to_gb_svc(dev);
31
32 return sprintf(buf, "0x%04x\n", svc->endo_id);
33 }
34 static DEVICE_ATTR_RO(endo_id);
35
ap_intf_id_show(struct device * dev,struct device_attribute * attr,char * buf)36 static ssize_t ap_intf_id_show(struct device *dev,
37 struct device_attribute *attr, char *buf)
38 {
39 struct gb_svc *svc = to_gb_svc(dev);
40
41 return sprintf(buf, "%u\n", svc->ap_intf_id);
42 }
43 static DEVICE_ATTR_RO(ap_intf_id);
44
45 // FIXME
46 // This is a hack, we need to do this "right" and clean the interface up
47 // properly, not just forcibly yank the thing out of the system and hope for the
48 // best. But for now, people want their modules to come out without having to
49 // throw the thing to the ground or get out a screwdriver.
intf_eject_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)50 static ssize_t intf_eject_store(struct device *dev,
51 struct device_attribute *attr, const char *buf,
52 size_t len)
53 {
54 struct gb_svc *svc = to_gb_svc(dev);
55 unsigned short intf_id;
56 int ret;
57
58 ret = kstrtou16(buf, 10, &intf_id);
59 if (ret < 0)
60 return ret;
61
62 dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
63
64 ret = gb_svc_intf_eject(svc, intf_id);
65 if (ret < 0)
66 return ret;
67
68 return len;
69 }
70 static DEVICE_ATTR_WO(intf_eject);
71
watchdog_show(struct device * dev,struct device_attribute * attr,char * buf)72 static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr,
73 char *buf)
74 {
75 struct gb_svc *svc = to_gb_svc(dev);
76
77 return sprintf(buf, "%s\n",
78 gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled");
79 }
80
watchdog_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)81 static ssize_t watchdog_store(struct device *dev,
82 struct device_attribute *attr, const char *buf,
83 size_t len)
84 {
85 struct gb_svc *svc = to_gb_svc(dev);
86 int retval;
87 bool user_request;
88
89 retval = strtobool(buf, &user_request);
90 if (retval)
91 return retval;
92
93 if (user_request)
94 retval = gb_svc_watchdog_enable(svc);
95 else
96 retval = gb_svc_watchdog_disable(svc);
97 if (retval)
98 return retval;
99 return len;
100 }
101 static DEVICE_ATTR_RW(watchdog);
102
watchdog_action_show(struct device * dev,struct device_attribute * attr,char * buf)103 static ssize_t watchdog_action_show(struct device *dev,
104 struct device_attribute *attr, char *buf)
105 {
106 struct gb_svc *svc = to_gb_svc(dev);
107
108 if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL)
109 return sprintf(buf, "panic\n");
110 else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO)
111 return sprintf(buf, "reset\n");
112
113 return -EINVAL;
114 }
115
watchdog_action_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)116 static ssize_t watchdog_action_store(struct device *dev,
117 struct device_attribute *attr,
118 const char *buf, size_t len)
119 {
120 struct gb_svc *svc = to_gb_svc(dev);
121
122 if (sysfs_streq(buf, "panic"))
123 svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL;
124 else if (sysfs_streq(buf, "reset"))
125 svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO;
126 else
127 return -EINVAL;
128
129 return len;
130 }
131 static DEVICE_ATTR_RW(watchdog_action);
132
gb_svc_pwrmon_rail_count_get(struct gb_svc * svc,u8 * value)133 static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value)
134 {
135 struct gb_svc_pwrmon_rail_count_get_response response;
136 int ret;
137
138 ret = gb_operation_sync(svc->connection,
139 GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0,
140 &response, sizeof(response));
141 if (ret) {
142 dev_err(&svc->dev, "failed to get rail count: %d\n", ret);
143 return ret;
144 }
145
146 *value = response.rail_count;
147
148 return 0;
149 }
150
gb_svc_pwrmon_rail_names_get(struct gb_svc * svc,struct gb_svc_pwrmon_rail_names_get_response * response,size_t bufsize)151 static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc,
152 struct gb_svc_pwrmon_rail_names_get_response *response,
153 size_t bufsize)
154 {
155 int ret;
156
157 ret = gb_operation_sync(svc->connection,
158 GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0,
159 response, bufsize);
160 if (ret) {
161 dev_err(&svc->dev, "failed to get rail names: %d\n", ret);
162 return ret;
163 }
164
165 if (response->status != GB_SVC_OP_SUCCESS) {
166 dev_err(&svc->dev,
167 "SVC error while getting rail names: %u\n",
168 response->status);
169 return -EREMOTEIO;
170 }
171
172 return 0;
173 }
174
gb_svc_pwrmon_sample_get(struct gb_svc * svc,u8 rail_id,u8 measurement_type,u32 * value)175 static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id,
176 u8 measurement_type, u32 *value)
177 {
178 struct gb_svc_pwrmon_sample_get_request request;
179 struct gb_svc_pwrmon_sample_get_response response;
180 int ret;
181
182 request.rail_id = rail_id;
183 request.measurement_type = measurement_type;
184
185 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET,
186 &request, sizeof(request),
187 &response, sizeof(response));
188 if (ret) {
189 dev_err(&svc->dev, "failed to get rail sample: %d\n", ret);
190 return ret;
191 }
192
193 if (response.result) {
194 dev_err(&svc->dev,
195 "UniPro error while getting rail power sample (%d %d): %d\n",
196 rail_id, measurement_type, response.result);
197 switch (response.result) {
198 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
199 return -EINVAL;
200 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
201 return -ENOMSG;
202 default:
203 return -EREMOTEIO;
204 }
205 }
206
207 *value = le32_to_cpu(response.measurement);
208
209 return 0;
210 }
211
gb_svc_pwrmon_intf_sample_get(struct gb_svc * svc,u8 intf_id,u8 measurement_type,u32 * value)212 int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
213 u8 measurement_type, u32 *value)
214 {
215 struct gb_svc_pwrmon_intf_sample_get_request request;
216 struct gb_svc_pwrmon_intf_sample_get_response response;
217 int ret;
218
219 request.intf_id = intf_id;
220 request.measurement_type = measurement_type;
221
222 ret = gb_operation_sync(svc->connection,
223 GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET,
224 &request, sizeof(request),
225 &response, sizeof(response));
226 if (ret) {
227 dev_err(&svc->dev, "failed to get intf sample: %d\n", ret);
228 return ret;
229 }
230
231 if (response.result) {
232 dev_err(&svc->dev,
233 "UniPro error while getting intf power sample (%d %d): %d\n",
234 intf_id, measurement_type, response.result);
235 switch (response.result) {
236 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
237 return -EINVAL;
238 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
239 return -ENOMSG;
240 default:
241 return -EREMOTEIO;
242 }
243 }
244
245 *value = le32_to_cpu(response.measurement);
246
247 return 0;
248 }
249
250 static struct attribute *svc_attrs[] = {
251 &dev_attr_endo_id.attr,
252 &dev_attr_ap_intf_id.attr,
253 &dev_attr_intf_eject.attr,
254 &dev_attr_watchdog.attr,
255 &dev_attr_watchdog_action.attr,
256 NULL,
257 };
258 ATTRIBUTE_GROUPS(svc);
259
gb_svc_intf_device_id(struct gb_svc * svc,u8 intf_id,u8 device_id)260 int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
261 {
262 struct gb_svc_intf_device_id_request request;
263
264 request.intf_id = intf_id;
265 request.device_id = device_id;
266
267 return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
268 &request, sizeof(request), NULL, 0);
269 }
270
gb_svc_intf_eject(struct gb_svc * svc,u8 intf_id)271 int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
272 {
273 struct gb_svc_intf_eject_request request;
274 int ret;
275
276 request.intf_id = intf_id;
277
278 /*
279 * The pulse width for module release in svc is long so we need to
280 * increase the timeout so the operation will not return to soon.
281 */
282 ret = gb_operation_sync_timeout(svc->connection,
283 GB_SVC_TYPE_INTF_EJECT, &request,
284 sizeof(request), NULL, 0,
285 SVC_INTF_EJECT_TIMEOUT);
286 if (ret) {
287 dev_err(&svc->dev, "failed to eject interface %u\n", intf_id);
288 return ret;
289 }
290
291 return 0;
292 }
293
gb_svc_intf_vsys_set(struct gb_svc * svc,u8 intf_id,bool enable)294 int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable)
295 {
296 struct gb_svc_intf_vsys_request request;
297 struct gb_svc_intf_vsys_response response;
298 int type, ret;
299
300 request.intf_id = intf_id;
301
302 if (enable)
303 type = GB_SVC_TYPE_INTF_VSYS_ENABLE;
304 else
305 type = GB_SVC_TYPE_INTF_VSYS_DISABLE;
306
307 ret = gb_operation_sync(svc->connection, type,
308 &request, sizeof(request),
309 &response, sizeof(response));
310 if (ret < 0)
311 return ret;
312 if (response.result_code != GB_SVC_INTF_VSYS_OK)
313 return -EREMOTEIO;
314 return 0;
315 }
316
gb_svc_intf_refclk_set(struct gb_svc * svc,u8 intf_id,bool enable)317 int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable)
318 {
319 struct gb_svc_intf_refclk_request request;
320 struct gb_svc_intf_refclk_response response;
321 int type, ret;
322
323 request.intf_id = intf_id;
324
325 if (enable)
326 type = GB_SVC_TYPE_INTF_REFCLK_ENABLE;
327 else
328 type = GB_SVC_TYPE_INTF_REFCLK_DISABLE;
329
330 ret = gb_operation_sync(svc->connection, type,
331 &request, sizeof(request),
332 &response, sizeof(response));
333 if (ret < 0)
334 return ret;
335 if (response.result_code != GB_SVC_INTF_REFCLK_OK)
336 return -EREMOTEIO;
337 return 0;
338 }
339
gb_svc_intf_unipro_set(struct gb_svc * svc,u8 intf_id,bool enable)340 int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
341 {
342 struct gb_svc_intf_unipro_request request;
343 struct gb_svc_intf_unipro_response response;
344 int type, ret;
345
346 request.intf_id = intf_id;
347
348 if (enable)
349 type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE;
350 else
351 type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE;
352
353 ret = gb_operation_sync(svc->connection, type,
354 &request, sizeof(request),
355 &response, sizeof(response));
356 if (ret < 0)
357 return ret;
358 if (response.result_code != GB_SVC_INTF_UNIPRO_OK)
359 return -EREMOTEIO;
360 return 0;
361 }
362
gb_svc_intf_activate(struct gb_svc * svc,u8 intf_id,u8 * intf_type)363 int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
364 {
365 struct gb_svc_intf_activate_request request;
366 struct gb_svc_intf_activate_response response;
367 int ret;
368
369 request.intf_id = intf_id;
370
371 ret = gb_operation_sync_timeout(svc->connection,
372 GB_SVC_TYPE_INTF_ACTIVATE,
373 &request, sizeof(request),
374 &response, sizeof(response),
375 SVC_INTF_ACTIVATE_TIMEOUT);
376 if (ret < 0)
377 return ret;
378 if (response.status != GB_SVC_OP_SUCCESS) {
379 dev_err(&svc->dev, "failed to activate interface %u: %u\n",
380 intf_id, response.status);
381 return -EREMOTEIO;
382 }
383
384 *intf_type = response.intf_type;
385
386 return 0;
387 }
388
gb_svc_intf_resume(struct gb_svc * svc,u8 intf_id)389 int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id)
390 {
391 struct gb_svc_intf_resume_request request;
392 struct gb_svc_intf_resume_response response;
393 int ret;
394
395 request.intf_id = intf_id;
396
397 ret = gb_operation_sync_timeout(svc->connection,
398 GB_SVC_TYPE_INTF_RESUME,
399 &request, sizeof(request),
400 &response, sizeof(response),
401 SVC_INTF_RESUME_TIMEOUT);
402 if (ret < 0) {
403 dev_err(&svc->dev, "failed to send interface resume %u: %d\n",
404 intf_id, ret);
405 return ret;
406 }
407
408 if (response.status != GB_SVC_OP_SUCCESS) {
409 dev_err(&svc->dev, "failed to resume interface %u: %u\n",
410 intf_id, response.status);
411 return -EREMOTEIO;
412 }
413
414 return 0;
415 }
416
gb_svc_dme_peer_get(struct gb_svc * svc,u8 intf_id,u16 attr,u16 selector,u32 * value)417 int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
418 u32 *value)
419 {
420 struct gb_svc_dme_peer_get_request request;
421 struct gb_svc_dme_peer_get_response response;
422 u16 result;
423 int ret;
424
425 request.intf_id = intf_id;
426 request.attr = cpu_to_le16(attr);
427 request.selector = cpu_to_le16(selector);
428
429 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
430 &request, sizeof(request),
431 &response, sizeof(response));
432 if (ret) {
433 dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n",
434 intf_id, attr, selector, ret);
435 return ret;
436 }
437
438 result = le16_to_cpu(response.result_code);
439 if (result) {
440 dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n",
441 intf_id, attr, selector, result);
442 return -EREMOTEIO;
443 }
444
445 if (value)
446 *value = le32_to_cpu(response.attr_value);
447
448 return 0;
449 }
450
gb_svc_dme_peer_set(struct gb_svc * svc,u8 intf_id,u16 attr,u16 selector,u32 value)451 int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
452 u32 value)
453 {
454 struct gb_svc_dme_peer_set_request request;
455 struct gb_svc_dme_peer_set_response response;
456 u16 result;
457 int ret;
458
459 request.intf_id = intf_id;
460 request.attr = cpu_to_le16(attr);
461 request.selector = cpu_to_le16(selector);
462 request.value = cpu_to_le32(value);
463
464 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
465 &request, sizeof(request),
466 &response, sizeof(response));
467 if (ret) {
468 dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n",
469 intf_id, attr, selector, value, ret);
470 return ret;
471 }
472
473 result = le16_to_cpu(response.result_code);
474 if (result) {
475 dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n",
476 intf_id, attr, selector, value, result);
477 return -EREMOTEIO;
478 }
479
480 return 0;
481 }
482
gb_svc_connection_create(struct gb_svc * svc,u8 intf1_id,u16 cport1_id,u8 intf2_id,u16 cport2_id,u8 cport_flags)483 int gb_svc_connection_create(struct gb_svc *svc,
484 u8 intf1_id, u16 cport1_id,
485 u8 intf2_id, u16 cport2_id,
486 u8 cport_flags)
487 {
488 struct gb_svc_conn_create_request request;
489
490 request.intf1_id = intf1_id;
491 request.cport1_id = cpu_to_le16(cport1_id);
492 request.intf2_id = intf2_id;
493 request.cport2_id = cpu_to_le16(cport2_id);
494 request.tc = 0; /* TC0 */
495 request.flags = cport_flags;
496
497 return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
498 &request, sizeof(request), NULL, 0);
499 }
500
gb_svc_connection_destroy(struct gb_svc * svc,u8 intf1_id,u16 cport1_id,u8 intf2_id,u16 cport2_id)501 void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
502 u8 intf2_id, u16 cport2_id)
503 {
504 struct gb_svc_conn_destroy_request request;
505 struct gb_connection *connection = svc->connection;
506 int ret;
507
508 request.intf1_id = intf1_id;
509 request.cport1_id = cpu_to_le16(cport1_id);
510 request.intf2_id = intf2_id;
511 request.cport2_id = cpu_to_le16(cport2_id);
512
513 ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
514 &request, sizeof(request), NULL, 0);
515 if (ret) {
516 dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n",
517 intf1_id, cport1_id, intf2_id, cport2_id, ret);
518 }
519 }
520
gb_svc_timesync_enable(struct gb_svc * svc,u8 count,u64 frame_time,u32 strobe_delay,u32 refclk)521 int gb_svc_timesync_enable(struct gb_svc *svc, u8 count, u64 frame_time,
522 u32 strobe_delay, u32 refclk)
523 {
524 struct gb_connection *connection = svc->connection;
525 struct gb_svc_timesync_enable_request request;
526
527 request.count = count;
528 request.frame_time = cpu_to_le64(frame_time);
529 request.strobe_delay = cpu_to_le32(strobe_delay);
530 request.refclk = cpu_to_le32(refclk);
531 return gb_operation_sync(connection,
532 GB_SVC_TYPE_TIMESYNC_ENABLE,
533 &request, sizeof(request), NULL, 0);
534 }
535
gb_svc_timesync_disable(struct gb_svc * svc)536 int gb_svc_timesync_disable(struct gb_svc *svc)
537 {
538 struct gb_connection *connection = svc->connection;
539
540 return gb_operation_sync(connection,
541 GB_SVC_TYPE_TIMESYNC_DISABLE,
542 NULL, 0, NULL, 0);
543 }
544
gb_svc_timesync_authoritative(struct gb_svc * svc,u64 * frame_time)545 int gb_svc_timesync_authoritative(struct gb_svc *svc, u64 *frame_time)
546 {
547 struct gb_connection *connection = svc->connection;
548 struct gb_svc_timesync_authoritative_response response;
549 int ret, i;
550
551 ret = gb_operation_sync(connection,
552 GB_SVC_TYPE_TIMESYNC_AUTHORITATIVE, NULL, 0,
553 &response, sizeof(response));
554 if (ret < 0)
555 return ret;
556
557 for (i = 0; i < GB_TIMESYNC_MAX_STROBES; i++)
558 frame_time[i] = le64_to_cpu(response.frame_time[i]);
559 return 0;
560 }
561
gb_svc_timesync_ping(struct gb_svc * svc,u64 * frame_time)562 int gb_svc_timesync_ping(struct gb_svc *svc, u64 *frame_time)
563 {
564 struct gb_connection *connection = svc->connection;
565 struct gb_svc_timesync_ping_response response;
566 int ret;
567
568 ret = gb_operation_sync(connection,
569 GB_SVC_TYPE_TIMESYNC_PING,
570 NULL, 0,
571 &response, sizeof(response));
572 if (ret < 0)
573 return ret;
574
575 *frame_time = le64_to_cpu(response.frame_time);
576 return 0;
577 }
578
gb_svc_timesync_wake_pins_acquire(struct gb_svc * svc,u32 strobe_mask)579 int gb_svc_timesync_wake_pins_acquire(struct gb_svc *svc, u32 strobe_mask)
580 {
581 struct gb_connection *connection = svc->connection;
582 struct gb_svc_timesync_wake_pins_acquire_request request;
583
584 request.strobe_mask = cpu_to_le32(strobe_mask);
585 return gb_operation_sync(connection,
586 GB_SVC_TYPE_TIMESYNC_WAKE_PINS_ACQUIRE,
587 &request, sizeof(request),
588 NULL, 0);
589 }
590
gb_svc_timesync_wake_pins_release(struct gb_svc * svc)591 int gb_svc_timesync_wake_pins_release(struct gb_svc *svc)
592 {
593 struct gb_connection *connection = svc->connection;
594
595 return gb_operation_sync(connection,
596 GB_SVC_TYPE_TIMESYNC_WAKE_PINS_RELEASE,
597 NULL, 0, NULL, 0);
598 }
599
600 /* Creates bi-directional routes between the devices */
gb_svc_route_create(struct gb_svc * svc,u8 intf1_id,u8 dev1_id,u8 intf2_id,u8 dev2_id)601 int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
602 u8 intf2_id, u8 dev2_id)
603 {
604 struct gb_svc_route_create_request request;
605
606 request.intf1_id = intf1_id;
607 request.dev1_id = dev1_id;
608 request.intf2_id = intf2_id;
609 request.dev2_id = dev2_id;
610
611 return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
612 &request, sizeof(request), NULL, 0);
613 }
614
615 /* Destroys bi-directional routes between the devices */
gb_svc_route_destroy(struct gb_svc * svc,u8 intf1_id,u8 intf2_id)616 void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
617 {
618 struct gb_svc_route_destroy_request request;
619 int ret;
620
621 request.intf1_id = intf1_id;
622 request.intf2_id = intf2_id;
623
624 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
625 &request, sizeof(request), NULL, 0);
626 if (ret) {
627 dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
628 intf1_id, intf2_id, ret);
629 }
630 }
631
gb_svc_intf_set_power_mode(struct gb_svc * svc,u8 intf_id,u8 hs_series,u8 tx_mode,u8 tx_gear,u8 tx_nlanes,u8 tx_amplitude,u8 tx_hs_equalizer,u8 rx_mode,u8 rx_gear,u8 rx_nlanes,u8 flags,u32 quirks,struct gb_svc_l2_timer_cfg * local,struct gb_svc_l2_timer_cfg * remote)632 int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
633 u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
634 u8 tx_amplitude, u8 tx_hs_equalizer,
635 u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
636 u8 flags, u32 quirks,
637 struct gb_svc_l2_timer_cfg *local,
638 struct gb_svc_l2_timer_cfg *remote)
639 {
640 struct gb_svc_intf_set_pwrm_request request;
641 struct gb_svc_intf_set_pwrm_response response;
642 int ret;
643 u16 result_code;
644
645 memset(&request, 0, sizeof(request));
646
647 request.intf_id = intf_id;
648 request.hs_series = hs_series;
649 request.tx_mode = tx_mode;
650 request.tx_gear = tx_gear;
651 request.tx_nlanes = tx_nlanes;
652 request.tx_amplitude = tx_amplitude;
653 request.tx_hs_equalizer = tx_hs_equalizer;
654 request.rx_mode = rx_mode;
655 request.rx_gear = rx_gear;
656 request.rx_nlanes = rx_nlanes;
657 request.flags = flags;
658 request.quirks = cpu_to_le32(quirks);
659 if (local)
660 request.local_l2timerdata = *local;
661 if (remote)
662 request.remote_l2timerdata = *remote;
663
664 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
665 &request, sizeof(request),
666 &response, sizeof(response));
667 if (ret < 0)
668 return ret;
669
670 result_code = response.result_code;
671 if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) {
672 dev_err(&svc->dev, "set power mode = %d\n", result_code);
673 return -EIO;
674 }
675
676 return 0;
677 }
678 EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
679
gb_svc_intf_set_power_mode_hibernate(struct gb_svc * svc,u8 intf_id)680 int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id)
681 {
682 struct gb_svc_intf_set_pwrm_request request;
683 struct gb_svc_intf_set_pwrm_response response;
684 int ret;
685 u16 result_code;
686
687 memset(&request, 0, sizeof(request));
688
689 request.intf_id = intf_id;
690 request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A;
691 request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
692 request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
693
694 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
695 &request, sizeof(request),
696 &response, sizeof(response));
697 if (ret < 0) {
698 dev_err(&svc->dev,
699 "failed to send set power mode operation to interface %u: %d\n",
700 intf_id, ret);
701 return ret;
702 }
703
704 result_code = response.result_code;
705 if (result_code != GB_SVC_SETPWRM_PWR_OK) {
706 dev_err(&svc->dev,
707 "failed to hibernate the link for interface %u: %u\n",
708 intf_id, result_code);
709 return -EIO;
710 }
711
712 return 0;
713 }
714
gb_svc_ping(struct gb_svc * svc)715 int gb_svc_ping(struct gb_svc *svc)
716 {
717 return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
718 NULL, 0, NULL, 0,
719 GB_OPERATION_TIMEOUT_DEFAULT * 2);
720 }
721
gb_svc_version_request(struct gb_operation * op)722 static int gb_svc_version_request(struct gb_operation *op)
723 {
724 struct gb_connection *connection = op->connection;
725 struct gb_svc *svc = gb_connection_get_data(connection);
726 struct gb_svc_version_request *request;
727 struct gb_svc_version_response *response;
728
729 if (op->request->payload_size < sizeof(*request)) {
730 dev_err(&svc->dev, "short version request (%zu < %zu)\n",
731 op->request->payload_size,
732 sizeof(*request));
733 return -EINVAL;
734 }
735
736 request = op->request->payload;
737
738 if (request->major > GB_SVC_VERSION_MAJOR) {
739 dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
740 request->major, GB_SVC_VERSION_MAJOR);
741 return -ENOTSUPP;
742 }
743
744 svc->protocol_major = request->major;
745 svc->protocol_minor = request->minor;
746
747 if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
748 return -ENOMEM;
749
750 response = op->response->payload;
751 response->major = svc->protocol_major;
752 response->minor = svc->protocol_minor;
753
754 return 0;
755 }
756
pwr_debugfs_voltage_read(struct file * file,char __user * buf,size_t len,loff_t * offset)757 static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf,
758 size_t len, loff_t *offset)
759 {
760 struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private;
761 struct gb_svc *svc = pwrmon_rails->svc;
762 int ret, desc;
763 u32 value;
764 char buff[16];
765
766 ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
767 GB_SVC_PWRMON_TYPE_VOL, &value);
768 if (ret) {
769 dev_err(&svc->dev,
770 "failed to get voltage sample %u: %d\n",
771 pwrmon_rails->id, ret);
772 return ret;
773 }
774
775 desc = scnprintf(buff, sizeof(buff), "%u\n", value);
776
777 return simple_read_from_buffer(buf, len, offset, buff, desc);
778 }
779
pwr_debugfs_current_read(struct file * file,char __user * buf,size_t len,loff_t * offset)780 static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf,
781 size_t len, loff_t *offset)
782 {
783 struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private;
784 struct gb_svc *svc = pwrmon_rails->svc;
785 int ret, desc;
786 u32 value;
787 char buff[16];
788
789 ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
790 GB_SVC_PWRMON_TYPE_CURR, &value);
791 if (ret) {
792 dev_err(&svc->dev,
793 "failed to get current sample %u: %d\n",
794 pwrmon_rails->id, ret);
795 return ret;
796 }
797
798 desc = scnprintf(buff, sizeof(buff), "%u\n", value);
799
800 return simple_read_from_buffer(buf, len, offset, buff, desc);
801 }
802
pwr_debugfs_power_read(struct file * file,char __user * buf,size_t len,loff_t * offset)803 static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf,
804 size_t len, loff_t *offset)
805 {
806 struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private;
807 struct gb_svc *svc = pwrmon_rails->svc;
808 int ret, desc;
809 u32 value;
810 char buff[16];
811
812 ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
813 GB_SVC_PWRMON_TYPE_PWR, &value);
814 if (ret) {
815 dev_err(&svc->dev, "failed to get power sample %u: %d\n",
816 pwrmon_rails->id, ret);
817 return ret;
818 }
819
820 desc = scnprintf(buff, sizeof(buff), "%u\n", value);
821
822 return simple_read_from_buffer(buf, len, offset, buff, desc);
823 }
824
825 static const struct file_operations pwrmon_debugfs_voltage_fops = {
826 .read = pwr_debugfs_voltage_read,
827 };
828
829 static const struct file_operations pwrmon_debugfs_current_fops = {
830 .read = pwr_debugfs_current_read,
831 };
832
833 static const struct file_operations pwrmon_debugfs_power_fops = {
834 .read = pwr_debugfs_power_read,
835 };
836
gb_svc_pwrmon_debugfs_init(struct gb_svc * svc)837 static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc)
838 {
839 int i;
840 size_t bufsize;
841 struct dentry *dent;
842 struct gb_svc_pwrmon_rail_names_get_response *rail_names;
843 u8 rail_count;
844
845 dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry);
846 if (IS_ERR_OR_NULL(dent))
847 return;
848
849 if (gb_svc_pwrmon_rail_count_get(svc, &rail_count))
850 goto err_pwrmon_debugfs;
851
852 if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT)
853 goto err_pwrmon_debugfs;
854
855 bufsize = sizeof(*rail_names) +
856 GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count;
857
858 rail_names = kzalloc(bufsize, GFP_KERNEL);
859 if (!rail_names)
860 goto err_pwrmon_debugfs;
861
862 svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails),
863 GFP_KERNEL);
864 if (!svc->pwrmon_rails)
865 goto err_pwrmon_debugfs_free;
866
867 if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize))
868 goto err_pwrmon_debugfs_free;
869
870 for (i = 0; i < rail_count; i++) {
871 struct dentry *dir;
872 struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i];
873 char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE];
874
875 snprintf(fname, sizeof(fname), "%s",
876 (char *)&rail_names->name[i]);
877
878 rail->id = i;
879 rail->svc = svc;
880
881 dir = debugfs_create_dir(fname, dent);
882 debugfs_create_file("voltage_now", S_IRUGO, dir, rail,
883 &pwrmon_debugfs_voltage_fops);
884 debugfs_create_file("current_now", S_IRUGO, dir, rail,
885 &pwrmon_debugfs_current_fops);
886 debugfs_create_file("power_now", S_IRUGO, dir, rail,
887 &pwrmon_debugfs_power_fops);
888 }
889
890 kfree(rail_names);
891 return;
892
893 err_pwrmon_debugfs_free:
894 kfree(rail_names);
895 kfree(svc->pwrmon_rails);
896 svc->pwrmon_rails = NULL;
897
898 err_pwrmon_debugfs:
899 debugfs_remove(dent);
900 }
901
gb_svc_debugfs_init(struct gb_svc * svc)902 static void gb_svc_debugfs_init(struct gb_svc *svc)
903 {
904 svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev),
905 gb_debugfs_get());
906 gb_svc_pwrmon_debugfs_init(svc);
907 }
908
gb_svc_debugfs_exit(struct gb_svc * svc)909 static void gb_svc_debugfs_exit(struct gb_svc *svc)
910 {
911 debugfs_remove_recursive(svc->debugfs_dentry);
912 kfree(svc->pwrmon_rails);
913 svc->pwrmon_rails = NULL;
914 }
915
gb_svc_hello(struct gb_operation * op)916 static int gb_svc_hello(struct gb_operation *op)
917 {
918 struct gb_connection *connection = op->connection;
919 struct gb_svc *svc = gb_connection_get_data(connection);
920 struct gb_svc_hello_request *hello_request;
921 int ret;
922
923 if (op->request->payload_size < sizeof(*hello_request)) {
924 dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
925 op->request->payload_size,
926 sizeof(*hello_request));
927 return -EINVAL;
928 }
929
930 hello_request = op->request->payload;
931 svc->endo_id = le16_to_cpu(hello_request->endo_id);
932 svc->ap_intf_id = hello_request->interface_id;
933
934 ret = device_add(&svc->dev);
935 if (ret) {
936 dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
937 return ret;
938 }
939
940 ret = gb_svc_watchdog_create(svc);
941 if (ret) {
942 dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
943 goto err_unregister_device;
944 }
945
946 gb_svc_debugfs_init(svc);
947
948 ret = gb_timesync_svc_add(svc);
949 if (ret) {
950 dev_err(&svc->dev, "failed to add SVC to timesync: %d\n", ret);
951 gb_svc_debugfs_exit(svc);
952 goto err_unregister_device;
953 }
954
955 return gb_svc_queue_deferred_request(op);
956
957 err_unregister_device:
958 gb_svc_watchdog_destroy(svc);
959 device_del(&svc->dev);
960 return ret;
961 }
962
gb_svc_interface_lookup(struct gb_svc * svc,u8 intf_id)963 static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
964 u8 intf_id)
965 {
966 struct gb_host_device *hd = svc->hd;
967 struct gb_module *module;
968 size_t num_interfaces;
969 u8 module_id;
970
971 list_for_each_entry(module, &hd->modules, hd_node) {
972 module_id = module->module_id;
973 num_interfaces = module->num_interfaces;
974
975 if (intf_id >= module_id &&
976 intf_id < module_id + num_interfaces) {
977 return module->interfaces[intf_id - module_id];
978 }
979 }
980
981 return NULL;
982 }
983
gb_svc_module_lookup(struct gb_svc * svc,u8 module_id)984 static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
985 {
986 struct gb_host_device *hd = svc->hd;
987 struct gb_module *module;
988
989 list_for_each_entry(module, &hd->modules, hd_node) {
990 if (module->module_id == module_id)
991 return module;
992 }
993
994 return NULL;
995 }
996
gb_svc_process_hello_deferred(struct gb_operation * operation)997 static void gb_svc_process_hello_deferred(struct gb_operation *operation)
998 {
999 struct gb_connection *connection = operation->connection;
1000 struct gb_svc *svc = gb_connection_get_data(connection);
1001 int ret;
1002
1003 /*
1004 * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch
1005 * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient
1006 * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged
1007 * module.
1008 *
1009 * The code should be removed once SW-2217, Heuristic for UniPro
1010 * Power Mode Changes is resolved.
1011 */
1012 ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
1013 GB_SVC_UNIPRO_HS_SERIES_A,
1014 GB_SVC_UNIPRO_SLOW_AUTO_MODE,
1015 2, 1,
1016 GB_SVC_SMALL_AMPLITUDE, GB_SVC_NO_DE_EMPHASIS,
1017 GB_SVC_UNIPRO_SLOW_AUTO_MODE,
1018 2, 1,
1019 0, 0,
1020 NULL, NULL);
1021
1022 if (ret)
1023 dev_warn(&svc->dev,
1024 "power mode change failed on AP to switch link: %d\n",
1025 ret);
1026 }
1027
gb_svc_process_module_inserted(struct gb_operation * operation)1028 static void gb_svc_process_module_inserted(struct gb_operation *operation)
1029 {
1030 struct gb_svc_module_inserted_request *request;
1031 struct gb_connection *connection = operation->connection;
1032 struct gb_svc *svc = gb_connection_get_data(connection);
1033 struct gb_host_device *hd = svc->hd;
1034 struct gb_module *module;
1035 size_t num_interfaces;
1036 u8 module_id;
1037 u16 flags;
1038 int ret;
1039
1040 /* The request message size has already been verified. */
1041 request = operation->request->payload;
1042 module_id = request->primary_intf_id;
1043 num_interfaces = request->intf_count;
1044 flags = le16_to_cpu(request->flags);
1045
1046 dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n",
1047 __func__, module_id, num_interfaces, flags);
1048
1049 if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) {
1050 dev_warn(&svc->dev, "no primary interface detected on module %u\n",
1051 module_id);
1052 }
1053
1054 module = gb_svc_module_lookup(svc, module_id);
1055 if (module) {
1056 dev_warn(&svc->dev, "unexpected module-inserted event %u\n",
1057 module_id);
1058 return;
1059 }
1060
1061 module = gb_module_create(hd, module_id, num_interfaces);
1062 if (!module) {
1063 dev_err(&svc->dev, "failed to create module\n");
1064 return;
1065 }
1066
1067 ret = gb_module_add(module);
1068 if (ret) {
1069 gb_module_put(module);
1070 return;
1071 }
1072
1073 list_add(&module->hd_node, &hd->modules);
1074 }
1075
gb_svc_process_module_removed(struct gb_operation * operation)1076 static void gb_svc_process_module_removed(struct gb_operation *operation)
1077 {
1078 struct gb_svc_module_removed_request *request;
1079 struct gb_connection *connection = operation->connection;
1080 struct gb_svc *svc = gb_connection_get_data(connection);
1081 struct gb_module *module;
1082 u8 module_id;
1083
1084 /* The request message size has already been verified. */
1085 request = operation->request->payload;
1086 module_id = request->primary_intf_id;
1087
1088 dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id);
1089
1090 module = gb_svc_module_lookup(svc, module_id);
1091 if (!module) {
1092 dev_warn(&svc->dev, "unexpected module-removed event %u\n",
1093 module_id);
1094 return;
1095 }
1096
1097 module->disconnected = true;
1098
1099 gb_module_del(module);
1100 list_del(&module->hd_node);
1101 gb_module_put(module);
1102 }
1103
gb_svc_process_intf_oops(struct gb_operation * operation)1104 static void gb_svc_process_intf_oops(struct gb_operation *operation)
1105 {
1106 struct gb_svc_intf_oops_request *request;
1107 struct gb_connection *connection = operation->connection;
1108 struct gb_svc *svc = gb_connection_get_data(connection);
1109 struct gb_interface *intf;
1110 u8 intf_id;
1111 u8 reason;
1112
1113 /* The request message size has already been verified. */
1114 request = operation->request->payload;
1115 intf_id = request->intf_id;
1116 reason = request->reason;
1117
1118 intf = gb_svc_interface_lookup(svc, intf_id);
1119 if (!intf) {
1120 dev_warn(&svc->dev, "unexpected interface-oops event %u\n",
1121 intf_id);
1122 return;
1123 }
1124
1125 dev_info(&svc->dev, "Deactivating interface %u, interface oops reason = %u\n",
1126 intf_id, reason);
1127
1128 mutex_lock(&intf->mutex);
1129 intf->disconnected = true;
1130 gb_interface_disable(intf);
1131 gb_interface_deactivate(intf);
1132 mutex_unlock(&intf->mutex);
1133 }
1134
gb_svc_process_intf_mailbox_event(struct gb_operation * operation)1135 static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
1136 {
1137 struct gb_svc_intf_mailbox_event_request *request;
1138 struct gb_connection *connection = operation->connection;
1139 struct gb_svc *svc = gb_connection_get_data(connection);
1140 struct gb_interface *intf;
1141 u8 intf_id;
1142 u16 result_code;
1143 u32 mailbox;
1144
1145 /* The request message size has already been verified. */
1146 request = operation->request->payload;
1147 intf_id = request->intf_id;
1148 result_code = le16_to_cpu(request->result_code);
1149 mailbox = le32_to_cpu(request->mailbox);
1150
1151 dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
1152 __func__, intf_id, result_code, mailbox);
1153
1154 intf = gb_svc_interface_lookup(svc, intf_id);
1155 if (!intf) {
1156 dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
1157 return;
1158 }
1159
1160 gb_interface_mailbox_event(intf, result_code, mailbox);
1161 }
1162
gb_svc_process_deferred_request(struct work_struct * work)1163 static void gb_svc_process_deferred_request(struct work_struct *work)
1164 {
1165 struct gb_svc_deferred_request *dr;
1166 struct gb_operation *operation;
1167 struct gb_svc *svc;
1168 u8 type;
1169
1170 dr = container_of(work, struct gb_svc_deferred_request, work);
1171 operation = dr->operation;
1172 svc = gb_connection_get_data(operation->connection);
1173 type = operation->request->header->type;
1174
1175 switch (type) {
1176 case GB_SVC_TYPE_SVC_HELLO:
1177 gb_svc_process_hello_deferred(operation);
1178 break;
1179 case GB_SVC_TYPE_MODULE_INSERTED:
1180 gb_svc_process_module_inserted(operation);
1181 break;
1182 case GB_SVC_TYPE_MODULE_REMOVED:
1183 gb_svc_process_module_removed(operation);
1184 break;
1185 case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1186 gb_svc_process_intf_mailbox_event(operation);
1187 break;
1188 case GB_SVC_TYPE_INTF_OOPS:
1189 gb_svc_process_intf_oops(operation);
1190 break;
1191 default:
1192 dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
1193 }
1194
1195 gb_operation_put(operation);
1196 kfree(dr);
1197 }
1198
gb_svc_queue_deferred_request(struct gb_operation * operation)1199 static int gb_svc_queue_deferred_request(struct gb_operation *operation)
1200 {
1201 struct gb_svc *svc = gb_connection_get_data(operation->connection);
1202 struct gb_svc_deferred_request *dr;
1203
1204 dr = kmalloc(sizeof(*dr), GFP_KERNEL);
1205 if (!dr)
1206 return -ENOMEM;
1207
1208 gb_operation_get(operation);
1209
1210 dr->operation = operation;
1211 INIT_WORK(&dr->work, gb_svc_process_deferred_request);
1212
1213 queue_work(svc->wq, &dr->work);
1214
1215 return 0;
1216 }
1217
gb_svc_intf_reset_recv(struct gb_operation * op)1218 static int gb_svc_intf_reset_recv(struct gb_operation *op)
1219 {
1220 struct gb_svc *svc = gb_connection_get_data(op->connection);
1221 struct gb_message *request = op->request;
1222 struct gb_svc_intf_reset_request *reset;
1223 u8 intf_id;
1224
1225 if (request->payload_size < sizeof(*reset)) {
1226 dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
1227 request->payload_size, sizeof(*reset));
1228 return -EINVAL;
1229 }
1230 reset = request->payload;
1231
1232 intf_id = reset->intf_id;
1233
1234 /* FIXME Reset the interface here */
1235
1236 return 0;
1237 }
1238
gb_svc_module_inserted_recv(struct gb_operation * op)1239 static int gb_svc_module_inserted_recv(struct gb_operation *op)
1240 {
1241 struct gb_svc *svc = gb_connection_get_data(op->connection);
1242 struct gb_svc_module_inserted_request *request;
1243
1244 if (op->request->payload_size < sizeof(*request)) {
1245 dev_warn(&svc->dev, "short module-inserted request received (%zu < %zu)\n",
1246 op->request->payload_size, sizeof(*request));
1247 return -EINVAL;
1248 }
1249
1250 request = op->request->payload;
1251
1252 dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1253 request->primary_intf_id);
1254
1255 return gb_svc_queue_deferred_request(op);
1256 }
1257
gb_svc_module_removed_recv(struct gb_operation * op)1258 static int gb_svc_module_removed_recv(struct gb_operation *op)
1259 {
1260 struct gb_svc *svc = gb_connection_get_data(op->connection);
1261 struct gb_svc_module_removed_request *request;
1262
1263 if (op->request->payload_size < sizeof(*request)) {
1264 dev_warn(&svc->dev, "short module-removed request received (%zu < %zu)\n",
1265 op->request->payload_size, sizeof(*request));
1266 return -EINVAL;
1267 }
1268
1269 request = op->request->payload;
1270
1271 dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1272 request->primary_intf_id);
1273
1274 return gb_svc_queue_deferred_request(op);
1275 }
1276
gb_svc_intf_oops_recv(struct gb_operation * op)1277 static int gb_svc_intf_oops_recv(struct gb_operation *op)
1278 {
1279 struct gb_svc *svc = gb_connection_get_data(op->connection);
1280 struct gb_svc_intf_oops_request *request;
1281
1282 if (op->request->payload_size < sizeof(*request)) {
1283 dev_warn(&svc->dev, "short intf-oops request received (%zu < %zu)\n",
1284 op->request->payload_size, sizeof(*request));
1285 return -EINVAL;
1286 }
1287
1288 return gb_svc_queue_deferred_request(op);
1289 }
1290
gb_svc_intf_mailbox_event_recv(struct gb_operation * op)1291 static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op)
1292 {
1293 struct gb_svc *svc = gb_connection_get_data(op->connection);
1294 struct gb_svc_intf_mailbox_event_request *request;
1295
1296 if (op->request->payload_size < sizeof(*request)) {
1297 dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n",
1298 op->request->payload_size, sizeof(*request));
1299 return -EINVAL;
1300 }
1301
1302 request = op->request->payload;
1303
1304 dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
1305
1306 return gb_svc_queue_deferred_request(op);
1307 }
1308
gb_svc_request_handler(struct gb_operation * op)1309 static int gb_svc_request_handler(struct gb_operation *op)
1310 {
1311 struct gb_connection *connection = op->connection;
1312 struct gb_svc *svc = gb_connection_get_data(connection);
1313 u8 type = op->type;
1314 int ret = 0;
1315
1316 /*
1317 * SVC requests need to follow a specific order (at least initially) and
1318 * below code takes care of enforcing that. The expected order is:
1319 * - PROTOCOL_VERSION
1320 * - SVC_HELLO
1321 * - Any other request, but the earlier two.
1322 *
1323 * Incoming requests are guaranteed to be serialized and so we don't
1324 * need to protect 'state' for any races.
1325 */
1326 switch (type) {
1327 case GB_SVC_TYPE_PROTOCOL_VERSION:
1328 if (svc->state != GB_SVC_STATE_RESET)
1329 ret = -EINVAL;
1330 break;
1331 case GB_SVC_TYPE_SVC_HELLO:
1332 if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
1333 ret = -EINVAL;
1334 break;
1335 default:
1336 if (svc->state != GB_SVC_STATE_SVC_HELLO)
1337 ret = -EINVAL;
1338 break;
1339 }
1340
1341 if (ret) {
1342 dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
1343 type, svc->state);
1344 return ret;
1345 }
1346
1347 switch (type) {
1348 case GB_SVC_TYPE_PROTOCOL_VERSION:
1349 ret = gb_svc_version_request(op);
1350 if (!ret)
1351 svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
1352 return ret;
1353 case GB_SVC_TYPE_SVC_HELLO:
1354 ret = gb_svc_hello(op);
1355 if (!ret)
1356 svc->state = GB_SVC_STATE_SVC_HELLO;
1357 return ret;
1358 case GB_SVC_TYPE_INTF_RESET:
1359 return gb_svc_intf_reset_recv(op);
1360 case GB_SVC_TYPE_MODULE_INSERTED:
1361 return gb_svc_module_inserted_recv(op);
1362 case GB_SVC_TYPE_MODULE_REMOVED:
1363 return gb_svc_module_removed_recv(op);
1364 case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1365 return gb_svc_intf_mailbox_event_recv(op);
1366 case GB_SVC_TYPE_INTF_OOPS:
1367 return gb_svc_intf_oops_recv(op);
1368 default:
1369 dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
1370 return -EINVAL;
1371 }
1372 }
1373
gb_svc_release(struct device * dev)1374 static void gb_svc_release(struct device *dev)
1375 {
1376 struct gb_svc *svc = to_gb_svc(dev);
1377
1378 if (svc->connection)
1379 gb_connection_destroy(svc->connection);
1380 ida_destroy(&svc->device_id_map);
1381 destroy_workqueue(svc->wq);
1382 kfree(svc);
1383 }
1384
1385 struct device_type greybus_svc_type = {
1386 .name = "greybus_svc",
1387 .release = gb_svc_release,
1388 };
1389
gb_svc_create(struct gb_host_device * hd)1390 struct gb_svc *gb_svc_create(struct gb_host_device *hd)
1391 {
1392 struct gb_svc *svc;
1393
1394 svc = kzalloc(sizeof(*svc), GFP_KERNEL);
1395 if (!svc)
1396 return NULL;
1397
1398 svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev));
1399 if (!svc->wq) {
1400 kfree(svc);
1401 return NULL;
1402 }
1403
1404 svc->dev.parent = &hd->dev;
1405 svc->dev.bus = &greybus_bus_type;
1406 svc->dev.type = &greybus_svc_type;
1407 svc->dev.groups = svc_groups;
1408 svc->dev.dma_mask = svc->dev.parent->dma_mask;
1409 device_initialize(&svc->dev);
1410
1411 dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
1412
1413 ida_init(&svc->device_id_map);
1414 svc->state = GB_SVC_STATE_RESET;
1415 svc->hd = hd;
1416
1417 svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
1418 gb_svc_request_handler);
1419 if (IS_ERR(svc->connection)) {
1420 dev_err(&svc->dev, "failed to create connection: %ld\n",
1421 PTR_ERR(svc->connection));
1422 goto err_put_device;
1423 }
1424
1425 gb_connection_set_data(svc->connection, svc);
1426
1427 return svc;
1428
1429 err_put_device:
1430 put_device(&svc->dev);
1431 return NULL;
1432 }
1433
gb_svc_add(struct gb_svc * svc)1434 int gb_svc_add(struct gb_svc *svc)
1435 {
1436 int ret;
1437
1438 /*
1439 * The SVC protocol is currently driven by the SVC, so the SVC device
1440 * is added from the connection request handler when enough
1441 * information has been received.
1442 */
1443 ret = gb_connection_enable(svc->connection);
1444 if (ret)
1445 return ret;
1446
1447 return 0;
1448 }
1449
gb_svc_remove_modules(struct gb_svc * svc)1450 static void gb_svc_remove_modules(struct gb_svc *svc)
1451 {
1452 struct gb_host_device *hd = svc->hd;
1453 struct gb_module *module, *tmp;
1454
1455 list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) {
1456 gb_module_del(module);
1457 list_del(&module->hd_node);
1458 gb_module_put(module);
1459 }
1460 }
1461
gb_svc_del(struct gb_svc * svc)1462 void gb_svc_del(struct gb_svc *svc)
1463 {
1464 gb_connection_disable_rx(svc->connection);
1465
1466 /*
1467 * The SVC device may have been registered from the request handler.
1468 */
1469 if (device_is_registered(&svc->dev)) {
1470 gb_timesync_svc_remove(svc);
1471 gb_svc_debugfs_exit(svc);
1472 gb_svc_watchdog_destroy(svc);
1473 device_del(&svc->dev);
1474 }
1475
1476 flush_workqueue(svc->wq);
1477
1478 gb_svc_remove_modules(svc);
1479
1480 gb_connection_disable(svc->connection);
1481 }
1482
gb_svc_put(struct gb_svc * svc)1483 void gb_svc_put(struct gb_svc *svc)
1484 {
1485 put_device(&svc->dev);
1486 }
1487