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1 | /* -*- c-basic-offset: 8 -*- |
2 | * | |
3 | * fw-device.c - Device probing and sysfs code. | |
4 | * | |
5 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software Foundation, | |
19 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/wait.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/kthread.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/delay.h> | |
28 | #include "fw-transaction.h" | |
29 | #include "fw-topology.h" | |
30 | #include "fw-device.h" | |
31 | ||
32 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
33 | { | |
34 | ci->p = p + 1; | |
35 | ci->end = ci->p + (p[0] >> 16); | |
36 | } | |
37 | ||
38 | EXPORT_SYMBOL(fw_csr_iterator_init); | |
39 | ||
40 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
41 | { | |
42 | *key = *ci->p >> 24; | |
43 | *value = *ci->p & 0xffffff; | |
44 | ||
45 | return ci->p++ < ci->end; | |
46 | } | |
47 | ||
48 | EXPORT_SYMBOL(fw_csr_iterator_next); | |
49 | ||
50 | static int is_fw_unit(struct device *dev); | |
51 | ||
52 | static int match_unit_directory(u32 * directory, struct fw_device_id *id) | |
53 | { | |
54 | struct fw_csr_iterator ci; | |
55 | int key, value, match; | |
56 | ||
57 | match = 0; | |
58 | fw_csr_iterator_init(&ci, directory); | |
59 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
60 | if (key == CSR_VENDOR && value == id->vendor) | |
61 | match |= FW_MATCH_VENDOR; | |
62 | if (key == CSR_MODEL && value == id->model) | |
63 | match |= FW_MATCH_MODEL; | |
64 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
65 | match |= FW_MATCH_SPECIFIER_ID; | |
66 | if (key == CSR_VERSION && value == id->version) | |
67 | match |= FW_MATCH_VERSION; | |
68 | } | |
69 | ||
70 | return (match & id->match_flags) == id->match_flags; | |
71 | } | |
72 | ||
73 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
74 | { | |
75 | struct fw_unit *unit = fw_unit(dev); | |
76 | struct fw_driver *driver = fw_driver(drv); | |
77 | int i; | |
78 | ||
79 | /* We only allow binding to fw_units. */ | |
80 | if (!is_fw_unit(dev)) | |
81 | return 0; | |
82 | ||
83 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
84 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
85 | return 1; | |
86 | } | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
92 | { | |
93 | struct fw_device *device = fw_device(unit->device.parent); | |
94 | struct fw_csr_iterator ci; | |
95 | ||
96 | int key, value; | |
97 | int vendor = 0; | |
98 | int model = 0; | |
99 | int specifier_id = 0; | |
100 | int version = 0; | |
101 | ||
102 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
103 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
104 | switch (key) { | |
105 | case CSR_VENDOR: | |
106 | vendor = value; | |
107 | break; | |
108 | case CSR_MODEL: | |
109 | model = value; | |
110 | break; | |
111 | } | |
112 | } | |
113 | ||
114 | fw_csr_iterator_init(&ci, unit->directory); | |
115 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
116 | switch (key) { | |
117 | case CSR_SPECIFIER_ID: | |
118 | specifier_id = value; | |
119 | break; | |
120 | case CSR_VERSION: | |
121 | version = value; | |
122 | break; | |
123 | } | |
124 | } | |
125 | ||
126 | return snprintf(buffer, buffer_size, | |
127 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
128 | vendor, model, specifier_id, version); | |
129 | } | |
130 | ||
131 | static int | |
132 | fw_unit_uevent(struct device *dev, char **envp, int num_envp, | |
133 | char *buffer, int buffer_size) | |
134 | { | |
135 | struct fw_unit *unit = fw_unit(dev); | |
136 | char modalias[64]; | |
137 | int length = 0; | |
138 | int i = 0; | |
139 | ||
140 | if (!is_fw_unit(dev)) | |
141 | goto out; | |
142 | ||
143 | get_modalias(unit, modalias, sizeof modalias); | |
144 | ||
145 | if (add_uevent_var(envp, num_envp, &i, | |
146 | buffer, buffer_size, &length, | |
147 | "MODALIAS=%s", modalias)) | |
148 | return -ENOMEM; | |
149 | ||
150 | out: | |
151 | envp[i] = NULL; | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | struct bus_type fw_bus_type = { | |
157 | .name = "fw", | |
158 | .match = fw_unit_match, | |
159 | .uevent = fw_unit_uevent | |
160 | }; | |
161 | ||
162 | EXPORT_SYMBOL(fw_bus_type); | |
163 | ||
164 | extern struct fw_device *fw_device_get(struct fw_device *device) | |
165 | { | |
166 | get_device(&device->device); | |
167 | ||
168 | return device; | |
169 | } | |
170 | ||
171 | extern void fw_device_put(struct fw_device *device) | |
172 | { | |
173 | put_device(&device->device); | |
174 | } | |
175 | ||
176 | static void fw_device_release(struct device *dev) | |
177 | { | |
178 | struct fw_device *device = fw_device(dev); | |
179 | unsigned long flags; | |
180 | ||
181 | /* Take the card lock so we don't set this to NULL while a | |
182 | * FW_NODE_UPDATED callback is being handled. */ | |
183 | spin_lock_irqsave(&device->card->lock, flags); | |
184 | device->node->data = NULL; | |
185 | spin_unlock_irqrestore(&device->card->lock, flags); | |
186 | ||
187 | fw_node_put(device->node); | |
188 | fw_card_put(device->card); | |
189 | kfree(device->config_rom); | |
190 | kfree(device); | |
191 | } | |
192 | ||
193 | int fw_device_enable_phys_dma(struct fw_device *device) | |
194 | { | |
195 | return device->card->driver->enable_phys_dma(device->card, | |
196 | device->node_id, | |
197 | device->generation); | |
198 | } | |
199 | ||
200 | EXPORT_SYMBOL(fw_device_enable_phys_dma); | |
201 | ||
202 | static ssize_t | |
203 | show_modalias_attribute(struct device *dev, | |
204 | struct device_attribute *attr, char *buf) | |
205 | { | |
206 | struct fw_unit *unit = fw_unit(dev); | |
207 | int length; | |
208 | ||
209 | length = get_modalias(unit, buf, PAGE_SIZE); | |
210 | strcpy(buf + length, "\n"); | |
211 | ||
212 | return length + 1; | |
213 | } | |
214 | ||
215 | static struct device_attribute modalias_attribute = { | |
216 | .attr = {.name = "modalias",.mode = S_IRUGO}, | |
217 | .show = show_modalias_attribute | |
218 | }; | |
219 | ||
220 | static ssize_t | |
221 | show_config_rom_attribute(struct device *dev, | |
222 | struct device_attribute *attr, char *buf) | |
223 | { | |
224 | struct fw_device *device = fw_device(dev); | |
225 | ||
226 | memcpy(buf, device->config_rom, device->config_rom_length * 4); | |
227 | ||
228 | return device->config_rom_length * 4; | |
229 | } | |
230 | ||
231 | static struct device_attribute config_rom_attribute = { | |
232 | .attr = {.name = "config_rom",.mode = S_IRUGO}, | |
233 | .show = show_config_rom_attribute, | |
234 | }; | |
235 | ||
236 | struct read_quadlet_callback_data { | |
237 | struct completion done; | |
238 | int rcode; | |
239 | u32 data; | |
240 | }; | |
241 | ||
242 | static void | |
243 | complete_transaction(struct fw_card *card, int rcode, | |
244 | void *payload, size_t length, void *data) | |
245 | { | |
246 | struct read_quadlet_callback_data *callback_data = data; | |
247 | ||
248 | if (rcode == RCODE_COMPLETE) | |
249 | callback_data->data = be32_to_cpu(*(__be32 *)payload); | |
250 | callback_data->rcode = rcode; | |
251 | complete(&callback_data->done); | |
252 | } | |
253 | ||
254 | static int read_rom(struct fw_device *device, int index, u32 * data) | |
255 | { | |
256 | struct read_quadlet_callback_data callback_data; | |
257 | struct fw_transaction t; | |
258 | u64 offset; | |
259 | ||
260 | init_completion(&callback_data.done); | |
261 | ||
262 | offset = 0xfffff0000400ULL + index * 4; | |
263 | fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST, | |
264 | device->node_id | LOCAL_BUS, | |
265 | device->generation, SCODE_100, | |
266 | offset, NULL, 4, complete_transaction, &callback_data); | |
267 | ||
268 | wait_for_completion(&callback_data.done); | |
269 | ||
270 | *data = callback_data.data; | |
271 | ||
272 | return callback_data.rcode; | |
273 | } | |
274 | ||
275 | static int read_bus_info_block(struct fw_device *device) | |
276 | { | |
277 | static u32 rom[256]; | |
278 | u32 stack[16], sp, key; | |
279 | int i, end, length; | |
280 | ||
281 | /* First read the bus info block. */ | |
282 | for (i = 0; i < 5; i++) { | |
283 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
284 | return -1; | |
285 | /* As per IEEE1212 7.2, during power-up, devices can | |
286 | * reply with a 0 for the first quadlet of the config | |
287 | * rom to indicate that they are booting (for example, | |
288 | * if the firmware is on the disk of a external | |
289 | * harddisk). In that case we just fail, and the | |
290 | * retry mechanism will try again later. */ | |
291 | if (i == 0 && rom[i] == 0) | |
292 | return -1; | |
293 | } | |
294 | ||
295 | /* Now parse the config rom. The config rom is a recursive | |
296 | * directory structure so we parse it using a stack of | |
297 | * references to the blocks that make up the structure. We | |
298 | * push a reference to the root directory on the stack to | |
299 | * start things off. */ | |
300 | length = i; | |
301 | sp = 0; | |
302 | stack[sp++] = 0xc0000005; | |
303 | while (sp > 0) { | |
304 | /* Pop the next block reference of the stack. The | |
305 | * lower 24 bits is the offset into the config rom, | |
306 | * the upper 8 bits are the type of the reference the | |
307 | * block. */ | |
308 | key = stack[--sp]; | |
309 | i = key & 0xffffff; | |
310 | if (i >= ARRAY_SIZE(rom)) | |
311 | /* The reference points outside the standard | |
312 | * config rom area, something's fishy. */ | |
313 | return -1; | |
314 | ||
315 | /* Read header quadlet for the block to get the length. */ | |
316 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
317 | return -1; | |
318 | end = i + (rom[i] >> 16) + 1; | |
319 | i++; | |
320 | if (end > ARRAY_SIZE(rom)) | |
321 | /* This block extends outside standard config | |
322 | * area (and the array we're reading it | |
323 | * into). That's broken, so ignore this | |
324 | * device. */ | |
325 | return -1; | |
326 | ||
327 | /* Now read in the block. If this is a directory | |
328 | * block, check the entries as we read them to see if | |
329 | * it references another block, and push it in that case. */ | |
330 | while (i < end) { | |
331 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) | |
332 | return -1; | |
333 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && | |
334 | sp < ARRAY_SIZE(stack)) | |
335 | stack[sp++] = i + rom[i]; | |
336 | i++; | |
337 | } | |
338 | if (length < i) | |
339 | length = i; | |
340 | } | |
341 | ||
342 | device->config_rom = kmalloc(length * 4, GFP_KERNEL); | |
343 | if (device->config_rom == NULL) | |
344 | return -1; | |
345 | memcpy(device->config_rom, rom, length * 4); | |
346 | device->config_rom_length = length; | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | static void fw_unit_release(struct device *dev) | |
352 | { | |
353 | struct fw_unit *unit = fw_unit(dev); | |
354 | ||
355 | kfree(unit); | |
356 | } | |
357 | ||
358 | static int is_fw_unit(struct device *dev) | |
359 | { | |
360 | return dev->release == fw_unit_release; | |
361 | } | |
362 | ||
363 | static void create_units(struct fw_device *device) | |
364 | { | |
365 | struct fw_csr_iterator ci; | |
366 | struct fw_unit *unit; | |
367 | int key, value, i; | |
368 | ||
369 | i = 0; | |
370 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
371 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
372 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
373 | continue; | |
374 | ||
375 | /* Get the address of the unit directory and try to | |
376 | * match the drivers id_tables against it. */ | |
377 | unit = kzalloc(sizeof *unit, GFP_KERNEL); | |
378 | if (unit == NULL) { | |
379 | fw_error("failed to allocate memory for unit\n"); | |
380 | continue; | |
381 | } | |
382 | ||
383 | unit->directory = ci.p + value - 1; | |
384 | unit->device.bus = &fw_bus_type; | |
385 | unit->device.release = fw_unit_release; | |
386 | unit->device.parent = &device->device; | |
387 | snprintf(unit->device.bus_id, sizeof unit->device.bus_id, | |
388 | "%s.%d", device->device.bus_id, i++); | |
389 | ||
390 | if (device_register(&unit->device) < 0) { | |
391 | kfree(unit); | |
392 | continue; | |
393 | } | |
394 | ||
395 | if (device_create_file(&unit->device, &modalias_attribute) < 0) { | |
396 | device_unregister(&unit->device); | |
397 | kfree(unit); | |
398 | } | |
399 | } | |
400 | } | |
401 | ||
402 | static int shutdown_unit(struct device *device, void *data) | |
403 | { | |
404 | struct fw_unit *unit = fw_unit(device); | |
405 | ||
406 | if (is_fw_unit(device)) { | |
407 | device_remove_file(&unit->device, &modalias_attribute); | |
408 | device_unregister(&unit->device); | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | static void fw_device_shutdown(struct work_struct *work) | |
415 | { | |
416 | struct fw_device *device = | |
417 | container_of(work, struct fw_device, work.work); | |
418 | ||
419 | device_remove_file(&device->device, &config_rom_attribute); | |
420 | cdev_del(&device->cdev); | |
421 | unregister_chrdev_region(device->device.devt, 1); | |
422 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
423 | device_unregister(&device->device); | |
424 | } | |
425 | ||
426 | /* These defines control the retry behavior for reading the config | |
427 | * rom. It shouldn't be necessary to tweak these; if the device | |
428 | * doesn't respond to a config rom read within 10 seconds, it's not | |
429 | * going to respond at all. As for the initial delay, a lot of | |
430 | * devices will be able to respond within half a second after bus | |
431 | * reset. On the other hand, it's not really worth being more | |
432 | * aggressive than that, since it scales pretty well; if 10 devices | |
433 | * are plugged in, they're all getting read within one second. */ | |
434 | ||
435 | #define MAX_RETRIES 5 | |
436 | #define RETRY_DELAY (2 * HZ) | |
437 | #define INITIAL_DELAY (HZ / 2) | |
438 | ||
439 | static void fw_device_init(struct work_struct *work) | |
440 | { | |
441 | static int serial; | |
442 | struct fw_device *device = | |
443 | container_of(work, struct fw_device, work.work); | |
444 | ||
445 | /* All failure paths here set node->data to NULL, so that we | |
446 | * don't try to do device_for_each_child() on a kfree()'d | |
447 | * device. */ | |
448 | ||
449 | if (read_bus_info_block(device) < 0) { | |
450 | if (device->config_rom_retries < MAX_RETRIES) { | |
451 | device->config_rom_retries++; | |
452 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
453 | } else { | |
454 | fw_notify("giving up on config rom for node id %d\n", | |
455 | device->node_id); | |
456 | fw_device_release(&device->device); | |
457 | } | |
458 | return; | |
459 | } | |
460 | ||
461 | device->device.bus = &fw_bus_type; | |
462 | device->device.release = fw_device_release; | |
463 | device->device.parent = device->card->device; | |
464 | snprintf(device->device.bus_id, sizeof device->device.bus_id, | |
465 | "fw%d", serial++); | |
466 | ||
467 | if (alloc_chrdev_region(&device->device.devt, 0, 1, "fw")) { | |
468 | fw_error("Failed to register char device region.\n"); | |
469 | goto error; | |
470 | } | |
471 | ||
472 | cdev_init(&device->cdev, &fw_device_ops); | |
473 | device->cdev.owner = THIS_MODULE; | |
474 | kobject_set_name(&device->cdev.kobj, device->device.bus_id); | |
475 | if (cdev_add(&device->cdev, device->device.devt, 1)) { | |
476 | fw_error("Failed to register char device.\n"); | |
477 | goto error; | |
478 | } | |
479 | ||
480 | if (device_add(&device->device)) { | |
481 | fw_error("Failed to add device.\n"); | |
482 | goto error; | |
483 | } | |
484 | ||
485 | if (device_create_file(&device->device, &config_rom_attribute) < 0) { | |
486 | fw_error("Failed to create config rom file.\n"); | |
487 | goto error_with_device; | |
488 | } | |
489 | ||
490 | create_units(device); | |
491 | ||
492 | /* Transition the device to running state. If it got pulled | |
493 | * out from under us while we did the intialization work, we | |
494 | * have to shut down the device again here. Normally, though, | |
495 | * fw_node_event will be responsible for shutting it down when | |
496 | * necessary. We have to use the atomic cmpxchg here to avoid | |
497 | * racing with the FW_NODE_DESTROYED case in | |
498 | * fw_node_event(). */ | |
499 | if (cmpxchg(&device->state, | |
500 | FW_DEVICE_INITIALIZING, | |
501 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) | |
502 | fw_device_shutdown(&device->work.work); | |
503 | else | |
504 | fw_notify("created new fw device %s (%d config rom retries)\n", | |
505 | device->device.bus_id, device->config_rom_retries); | |
506 | ||
507 | /* Reschedule the IRM work if we just finished reading the | |
508 | * root node config rom. If this races with a bus reset we | |
509 | * just end up running the IRM work a couple of extra times - | |
510 | * pretty harmless. */ | |
511 | if (device->node == device->card->root_node) | |
512 | schedule_delayed_work(&device->card->work, 0); | |
513 | ||
514 | return; | |
515 | ||
516 | error_with_device: | |
517 | device_del(&device->device); | |
518 | error: | |
519 | cdev_del(&device->cdev); | |
520 | unregister_chrdev_region(device->device.devt, 1); | |
521 | put_device(&device->device); | |
522 | } | |
523 | ||
524 | static int update_unit(struct device *dev, void *data) | |
525 | { | |
526 | struct fw_unit *unit = fw_unit(dev); | |
527 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
528 | ||
529 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) | |
530 | driver->update(unit); | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) | |
536 | { | |
537 | struct fw_device *device; | |
538 | ||
539 | /* Ignore events for the local node (i.e. the node that | |
540 | * corresponds to the ieee1394 controller in this linux box). */ | |
541 | if (node == card->local_node) | |
542 | return; | |
543 | ||
544 | switch (event) { | |
545 | case FW_NODE_CREATED: | |
546 | case FW_NODE_LINK_ON: | |
547 | if (!node->link_on) | |
548 | break; | |
549 | ||
550 | device = kzalloc(sizeof(*device), GFP_ATOMIC); | |
551 | if (device == NULL) | |
552 | break; | |
553 | ||
554 | /* Do minimal intialization of the device here, the | |
555 | * rest will happen in fw_device_init(). We need the | |
556 | * card and node so we can read the config rom and we | |
557 | * need to do device_initialize() now so | |
558 | * device_for_each_child() in FW_NODE_UPDATED is | |
559 | * doesn't freak out. */ | |
560 | device_initialize(&device->device); | |
561 | device->state = FW_DEVICE_INITIALIZING; | |
562 | device->card = fw_card_get(card); | |
563 | device->node = fw_node_get(node); | |
564 | device->node_id = node->node_id; | |
565 | device->generation = card->generation; | |
566 | ||
567 | /* Set the node data to point back to this device so | |
568 | * FW_NODE_UPDATED callbacks can update the node_id | |
569 | * and generation for the device. */ | |
570 | node->data = device; | |
571 | ||
572 | /* Many devices are slow to respond after bus resets, | |
573 | * especially if they are bus powered and go through | |
574 | * power-up after getting plugged in. We schedule the | |
575 | * first config rom scan half a second after bus reset. */ | |
576 | INIT_DELAYED_WORK(&device->work, fw_device_init); | |
577 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
578 | break; | |
579 | ||
580 | case FW_NODE_UPDATED: | |
581 | if (!node->link_on || node->data == NULL) | |
582 | break; | |
583 | ||
584 | device = node->data; | |
585 | device->node_id = node->node_id; | |
586 | device->generation = card->generation; | |
587 | device_for_each_child(&device->device, NULL, update_unit); | |
588 | break; | |
589 | ||
590 | case FW_NODE_DESTROYED: | |
591 | case FW_NODE_LINK_OFF: | |
592 | if (!node->data) | |
593 | break; | |
594 | ||
595 | /* Destroy the device associated with the node. There | |
596 | * are two cases here: either the device is fully | |
597 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
598 | * process of reading its config rom | |
599 | * (FW_DEVICE_INITIALIZING). If it is fully | |
600 | * initialized we can reuse device->work to schedule a | |
601 | * full fw_device_shutdown(). If not, there's work | |
602 | * scheduled to read it's config rom, and we just put | |
603 | * the device in shutdown state to have that code fail | |
604 | * to create the device. */ | |
605 | device = node->data; | |
606 | if (xchg(&device->state, | |
607 | FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { | |
608 | INIT_DELAYED_WORK(&device->work, fw_device_shutdown); | |
609 | schedule_delayed_work(&device->work, 0); | |
610 | } | |
611 | break; | |
612 | } | |
613 | } |