Commit | Line | Data |
---|---|---|
c781c06d KH |
1 | /* |
2 | * Device probing and sysfs code. | |
19a15b93 KH |
3 | * |
4 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software Foundation, | |
18 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/wait.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/kthread.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/delay.h> | |
a3aca3da | 27 | #include <linux/idr.h> |
633c52dc SR |
28 | #include <linux/rwsem.h> |
29 | #include <asm/semaphore.h> | |
b5d2a5e0 | 30 | #include <asm/system.h> |
7feb9cce | 31 | #include <linux/ctype.h> |
19a15b93 KH |
32 | #include "fw-transaction.h" |
33 | #include "fw-topology.h" | |
34 | #include "fw-device.h" | |
35 | ||
36 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
37 | { | |
38 | ci->p = p + 1; | |
39 | ci->end = ci->p + (p[0] >> 16); | |
40 | } | |
19a15b93 KH |
41 | EXPORT_SYMBOL(fw_csr_iterator_init); |
42 | ||
43 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
44 | { | |
45 | *key = *ci->p >> 24; | |
46 | *value = *ci->p & 0xffffff; | |
47 | ||
48 | return ci->p++ < ci->end; | |
49 | } | |
19a15b93 KH |
50 | EXPORT_SYMBOL(fw_csr_iterator_next); |
51 | ||
52 | static int is_fw_unit(struct device *dev); | |
53 | ||
21ebcd12 | 54 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
19a15b93 KH |
55 | { |
56 | struct fw_csr_iterator ci; | |
57 | int key, value, match; | |
58 | ||
59 | match = 0; | |
60 | fw_csr_iterator_init(&ci, directory); | |
61 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
62 | if (key == CSR_VENDOR && value == id->vendor) | |
63 | match |= FW_MATCH_VENDOR; | |
64 | if (key == CSR_MODEL && value == id->model) | |
65 | match |= FW_MATCH_MODEL; | |
66 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
67 | match |= FW_MATCH_SPECIFIER_ID; | |
68 | if (key == CSR_VERSION && value == id->version) | |
69 | match |= FW_MATCH_VERSION; | |
70 | } | |
71 | ||
72 | return (match & id->match_flags) == id->match_flags; | |
73 | } | |
74 | ||
75 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
76 | { | |
77 | struct fw_unit *unit = fw_unit(dev); | |
78 | struct fw_driver *driver = fw_driver(drv); | |
79 | int i; | |
80 | ||
81 | /* We only allow binding to fw_units. */ | |
82 | if (!is_fw_unit(dev)) | |
83 | return 0; | |
84 | ||
85 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
86 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
87 | return 1; | |
88 | } | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
94 | { | |
95 | struct fw_device *device = fw_device(unit->device.parent); | |
96 | struct fw_csr_iterator ci; | |
97 | ||
98 | int key, value; | |
99 | int vendor = 0; | |
100 | int model = 0; | |
101 | int specifier_id = 0; | |
102 | int version = 0; | |
103 | ||
104 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
105 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
106 | switch (key) { | |
107 | case CSR_VENDOR: | |
108 | vendor = value; | |
109 | break; | |
110 | case CSR_MODEL: | |
111 | model = value; | |
112 | break; | |
113 | } | |
114 | } | |
115 | ||
116 | fw_csr_iterator_init(&ci, unit->directory); | |
117 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
118 | switch (key) { | |
119 | case CSR_SPECIFIER_ID: | |
120 | specifier_id = value; | |
121 | break; | |
122 | case CSR_VERSION: | |
123 | version = value; | |
124 | break; | |
125 | } | |
126 | } | |
127 | ||
128 | return snprintf(buffer, buffer_size, | |
129 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
130 | vendor, model, specifier_id, version); | |
131 | } | |
132 | ||
133 | static int | |
7eff2e7a | 134 | fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
135 | { |
136 | struct fw_unit *unit = fw_unit(dev); | |
137 | char modalias[64]; | |
19a15b93 | 138 | |
2d826cc5 | 139 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 140 | |
7eff2e7a | 141 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
142 | return -ENOMEM; |
143 | ||
19a15b93 KH |
144 | return 0; |
145 | } | |
146 | ||
147 | struct bus_type fw_bus_type = { | |
362c2c8c | 148 | .name = "firewire", |
19a15b93 | 149 | .match = fw_unit_match, |
19a15b93 | 150 | }; |
19a15b93 KH |
151 | EXPORT_SYMBOL(fw_bus_type); |
152 | ||
0b6aa3d0 | 153 | struct fw_device *fw_device_get(struct fw_device *device) |
19a15b93 KH |
154 | { |
155 | get_device(&device->device); | |
156 | ||
157 | return device; | |
158 | } | |
159 | ||
0b6aa3d0 | 160 | void fw_device_put(struct fw_device *device) |
19a15b93 KH |
161 | { |
162 | put_device(&device->device); | |
163 | } | |
164 | ||
165 | static void fw_device_release(struct device *dev) | |
166 | { | |
167 | struct fw_device *device = fw_device(dev); | |
168 | unsigned long flags; | |
169 | ||
c781c06d KH |
170 | /* |
171 | * Take the card lock so we don't set this to NULL while a | |
172 | * FW_NODE_UPDATED callback is being handled. | |
173 | */ | |
19a15b93 KH |
174 | spin_lock_irqsave(&device->card->lock, flags); |
175 | device->node->data = NULL; | |
176 | spin_unlock_irqrestore(&device->card->lock, flags); | |
177 | ||
178 | fw_node_put(device->node); | |
179 | fw_card_put(device->card); | |
180 | kfree(device->config_rom); | |
181 | kfree(device); | |
182 | } | |
183 | ||
184 | int fw_device_enable_phys_dma(struct fw_device *device) | |
185 | { | |
b5d2a5e0 SR |
186 | int generation = device->generation; |
187 | ||
188 | /* device->node_id, accessed below, must not be older than generation */ | |
189 | smp_rmb(); | |
190 | ||
19a15b93 KH |
191 | return device->card->driver->enable_phys_dma(device->card, |
192 | device->node_id, | |
b5d2a5e0 | 193 | generation); |
19a15b93 | 194 | } |
19a15b93 KH |
195 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
196 | ||
7feb9cce KH |
197 | struct config_rom_attribute { |
198 | struct device_attribute attr; | |
199 | u32 key; | |
200 | }; | |
201 | ||
202 | static ssize_t | |
203 | show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) | |
204 | { | |
205 | struct config_rom_attribute *attr = | |
206 | container_of(dattr, struct config_rom_attribute, attr); | |
207 | struct fw_csr_iterator ci; | |
208 | u32 *dir; | |
209 | int key, value; | |
210 | ||
211 | if (is_fw_unit(dev)) | |
212 | dir = fw_unit(dev)->directory; | |
213 | else | |
214 | dir = fw_device(dev)->config_rom + 5; | |
215 | ||
216 | fw_csr_iterator_init(&ci, dir); | |
217 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
218 | if (attr->key == key) | |
219 | return snprintf(buf, buf ? PAGE_SIZE : 0, | |
220 | "0x%06x\n", value); | |
221 | ||
222 | return -ENOENT; | |
223 | } | |
224 | ||
225 | #define IMMEDIATE_ATTR(name, key) \ | |
226 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
227 | ||
228 | static ssize_t | |
229 | show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) | |
230 | { | |
231 | struct config_rom_attribute *attr = | |
232 | container_of(dattr, struct config_rom_attribute, attr); | |
233 | struct fw_csr_iterator ci; | |
234 | u32 *dir, *block = NULL, *p, *end; | |
235 | int length, key, value, last_key = 0; | |
236 | char *b; | |
237 | ||
238 | if (is_fw_unit(dev)) | |
239 | dir = fw_unit(dev)->directory; | |
240 | else | |
241 | dir = fw_device(dev)->config_rom + 5; | |
242 | ||
243 | fw_csr_iterator_init(&ci, dir); | |
244 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
245 | if (attr->key == last_key && | |
246 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
247 | block = ci.p - 1 + value; | |
248 | last_key = key; | |
249 | } | |
250 | ||
251 | if (block == NULL) | |
252 | return -ENOENT; | |
253 | ||
254 | length = min(block[0] >> 16, 256U); | |
255 | if (length < 3) | |
256 | return -ENOENT; | |
257 | ||
258 | if (block[1] != 0 || block[2] != 0) | |
259 | /* Unknown encoding. */ | |
260 | return -ENOENT; | |
261 | ||
262 | if (buf == NULL) | |
263 | return length * 4; | |
264 | ||
265 | b = buf; | |
266 | end = &block[length + 1]; | |
267 | for (p = &block[3]; p < end; p++, b += 4) | |
268 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
269 | ||
270 | /* Strip trailing whitespace and add newline. */ | |
271 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
272 | strcpy(b + 1, "\n"); | |
273 | ||
274 | return b + 2 - buf; | |
275 | } | |
276 | ||
277 | #define TEXT_LEAF_ATTR(name, key) \ | |
278 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
279 | ||
280 | static struct config_rom_attribute config_rom_attributes[] = { | |
281 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
282 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
283 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
284 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
285 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
286 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
287 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
288 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
289 | }; | |
290 | ||
291 | static void | |
6f2e53d5 KH |
292 | init_fw_attribute_group(struct device *dev, |
293 | struct device_attribute *attrs, | |
294 | struct fw_attribute_group *group) | |
7feb9cce KH |
295 | { |
296 | struct device_attribute *attr; | |
6f2e53d5 KH |
297 | int i, j; |
298 | ||
299 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
300 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
301 | |
302 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
303 | attr = &config_rom_attributes[i].attr; | |
304 | if (attr->show(dev, attr, NULL) < 0) | |
305 | continue; | |
6f2e53d5 | 306 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
307 | } |
308 | ||
6f2e53d5 KH |
309 | BUG_ON(j >= ARRAY_SIZE(group->attrs)); |
310 | group->attrs[j++] = NULL; | |
311 | group->groups[0] = &group->group; | |
312 | group->groups[1] = NULL; | |
313 | group->group.attrs = group->attrs; | |
314 | dev->groups = group->groups; | |
7feb9cce KH |
315 | } |
316 | ||
19a15b93 | 317 | static ssize_t |
21351dbe KH |
318 | modalias_show(struct device *dev, |
319 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
320 | { |
321 | struct fw_unit *unit = fw_unit(dev); | |
322 | int length; | |
323 | ||
324 | length = get_modalias(unit, buf, PAGE_SIZE); | |
325 | strcpy(buf + length, "\n"); | |
326 | ||
327 | return length + 1; | |
328 | } | |
329 | ||
19a15b93 | 330 | static ssize_t |
21351dbe KH |
331 | rom_index_show(struct device *dev, |
332 | struct device_attribute *attr, char *buf) | |
19a15b93 | 333 | { |
21351dbe KH |
334 | struct fw_device *device = fw_device(dev->parent); |
335 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 336 | |
21351dbe KH |
337 | return snprintf(buf, PAGE_SIZE, "%d\n", |
338 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
339 | } |
340 | ||
21351dbe KH |
341 | static struct device_attribute fw_unit_attributes[] = { |
342 | __ATTR_RO(modalias), | |
343 | __ATTR_RO(rom_index), | |
344 | __ATTR_NULL, | |
19a15b93 KH |
345 | }; |
346 | ||
048961ef | 347 | static ssize_t |
bbd14945 | 348 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
048961ef | 349 | { |
21351dbe | 350 | struct fw_device *device = fw_device(dev); |
048961ef | 351 | |
21351dbe KH |
352 | memcpy(buf, device->config_rom, device->config_rom_length * 4); |
353 | ||
354 | return device->config_rom_length * 4; | |
048961ef KH |
355 | } |
356 | ||
bbd14945 KH |
357 | static ssize_t |
358 | guid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
359 | { | |
360 | struct fw_device *device = fw_device(dev); | |
361 | u64 guid; | |
362 | ||
363 | guid = ((u64)device->config_rom[3] << 32) | device->config_rom[4]; | |
364 | ||
3e1dcb00 AM |
365 | return snprintf(buf, PAGE_SIZE, "0x%016llx\n", |
366 | (unsigned long long)guid); | |
bbd14945 KH |
367 | } |
368 | ||
21351dbe KH |
369 | static struct device_attribute fw_device_attributes[] = { |
370 | __ATTR_RO(config_rom), | |
bbd14945 | 371 | __ATTR_RO(guid), |
21351dbe | 372 | __ATTR_NULL, |
048961ef KH |
373 | }; |
374 | ||
19a15b93 KH |
375 | struct read_quadlet_callback_data { |
376 | struct completion done; | |
377 | int rcode; | |
378 | u32 data; | |
379 | }; | |
380 | ||
381 | static void | |
382 | complete_transaction(struct fw_card *card, int rcode, | |
383 | void *payload, size_t length, void *data) | |
384 | { | |
385 | struct read_quadlet_callback_data *callback_data = data; | |
386 | ||
387 | if (rcode == RCODE_COMPLETE) | |
388 | callback_data->data = be32_to_cpu(*(__be32 *)payload); | |
389 | callback_data->rcode = rcode; | |
390 | complete(&callback_data->done); | |
391 | } | |
392 | ||
f8d2dc39 SR |
393 | static int |
394 | read_rom(struct fw_device *device, int generation, int index, u32 *data) | |
19a15b93 KH |
395 | { |
396 | struct read_quadlet_callback_data callback_data; | |
397 | struct fw_transaction t; | |
398 | u64 offset; | |
b5d2a5e0 SR |
399 | |
400 | /* device->node_id, accessed below, must not be older than generation */ | |
401 | smp_rmb(); | |
19a15b93 KH |
402 | |
403 | init_completion(&callback_data.done); | |
404 | ||
405 | offset = 0xfffff0000400ULL + index * 4; | |
406 | fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST, | |
b5d2a5e0 | 407 | device->node_id, generation, device->max_speed, |
19a15b93 KH |
408 | offset, NULL, 4, complete_transaction, &callback_data); |
409 | ||
410 | wait_for_completion(&callback_data.done); | |
411 | ||
412 | *data = callback_data.data; | |
413 | ||
414 | return callback_data.rcode; | |
415 | } | |
416 | ||
f8d2dc39 SR |
417 | /* |
418 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
419 | * the config ROM. We do all this with a cached bus generation. If the bus | |
420 | * generation changes under us, read_bus_info_block will fail and get retried. | |
421 | * It's better to start all over in this case because the node from which we | |
422 | * are reading the ROM may have changed the ROM during the reset. | |
423 | */ | |
424 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 KH |
425 | { |
426 | static u32 rom[256]; | |
427 | u32 stack[16], sp, key; | |
428 | int i, end, length; | |
429 | ||
f1397490 SR |
430 | device->max_speed = SCODE_100; |
431 | ||
19a15b93 KH |
432 | /* First read the bus info block. */ |
433 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 434 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
19a15b93 | 435 | return -1; |
c781c06d KH |
436 | /* |
437 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
438 | * reply with a 0 for the first quadlet of the config |
439 | * rom to indicate that they are booting (for example, | |
440 | * if the firmware is on the disk of a external | |
441 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
442 | * retry mechanism will try again later. |
443 | */ | |
19a15b93 KH |
444 | if (i == 0 && rom[i] == 0) |
445 | return -1; | |
446 | } | |
447 | ||
f1397490 SR |
448 | device->max_speed = device->node->max_speed; |
449 | ||
450 | /* | |
451 | * Determine the speed of | |
452 | * - devices with link speed less than PHY speed, | |
453 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
454 | * - all devices if there are 1394b repeaters. | |
455 | * Note, we cannot use the bus info block's link_spd as starting point | |
456 | * because some buggy firmwares set it lower than necessary and because | |
457 | * 1394-1995 nodes do not have the field. | |
458 | */ | |
459 | if ((rom[2] & 0x7) < device->max_speed || | |
460 | device->max_speed == SCODE_BETA || | |
461 | device->card->beta_repeaters_present) { | |
462 | u32 dummy; | |
463 | ||
464 | /* for S1600 and S3200 */ | |
465 | if (device->max_speed == SCODE_BETA) | |
466 | device->max_speed = device->card->link_speed; | |
467 | ||
468 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
469 | if (read_rom(device, generation, 0, &dummy) == |
470 | RCODE_COMPLETE) | |
f1397490 SR |
471 | break; |
472 | device->max_speed--; | |
473 | } | |
474 | } | |
475 | ||
c781c06d KH |
476 | /* |
477 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
478 | * directory structure so we parse it using a stack of |
479 | * references to the blocks that make up the structure. We | |
480 | * push a reference to the root directory on the stack to | |
c781c06d KH |
481 | * start things off. |
482 | */ | |
19a15b93 KH |
483 | length = i; |
484 | sp = 0; | |
485 | stack[sp++] = 0xc0000005; | |
486 | while (sp > 0) { | |
c781c06d KH |
487 | /* |
488 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
489 | * lower 24 bits is the offset into the config rom, |
490 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
491 | * block. |
492 | */ | |
19a15b93 KH |
493 | key = stack[--sp]; |
494 | i = key & 0xffffff; | |
495 | if (i >= ARRAY_SIZE(rom)) | |
c781c06d KH |
496 | /* |
497 | * The reference points outside the standard | |
498 | * config rom area, something's fishy. | |
499 | */ | |
19a15b93 KH |
500 | return -1; |
501 | ||
502 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 503 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
19a15b93 KH |
504 | return -1; |
505 | end = i + (rom[i] >> 16) + 1; | |
506 | i++; | |
507 | if (end > ARRAY_SIZE(rom)) | |
c781c06d KH |
508 | /* |
509 | * This block extends outside standard config | |
19a15b93 KH |
510 | * area (and the array we're reading it |
511 | * into). That's broken, so ignore this | |
c781c06d KH |
512 | * device. |
513 | */ | |
19a15b93 KH |
514 | return -1; |
515 | ||
c781c06d KH |
516 | /* |
517 | * Now read in the block. If this is a directory | |
19a15b93 | 518 | * block, check the entries as we read them to see if |
c781c06d KH |
519 | * it references another block, and push it in that case. |
520 | */ | |
19a15b93 | 521 | while (i < end) { |
f8d2dc39 SR |
522 | if (read_rom(device, generation, i, &rom[i]) != |
523 | RCODE_COMPLETE) | |
19a15b93 KH |
524 | return -1; |
525 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && | |
526 | sp < ARRAY_SIZE(stack)) | |
527 | stack[sp++] = i + rom[i]; | |
528 | i++; | |
529 | } | |
530 | if (length < i) | |
531 | length = i; | |
532 | } | |
533 | ||
534 | device->config_rom = kmalloc(length * 4, GFP_KERNEL); | |
535 | if (device->config_rom == NULL) | |
536 | return -1; | |
537 | memcpy(device->config_rom, rom, length * 4); | |
538 | device->config_rom_length = length; | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | static void fw_unit_release(struct device *dev) | |
544 | { | |
545 | struct fw_unit *unit = fw_unit(dev); | |
546 | ||
547 | kfree(unit); | |
548 | } | |
549 | ||
21351dbe | 550 | static struct device_type fw_unit_type = { |
21351dbe KH |
551 | .uevent = fw_unit_uevent, |
552 | .release = fw_unit_release, | |
553 | }; | |
554 | ||
19a15b93 KH |
555 | static int is_fw_unit(struct device *dev) |
556 | { | |
21351dbe | 557 | return dev->type == &fw_unit_type; |
19a15b93 KH |
558 | } |
559 | ||
560 | static void create_units(struct fw_device *device) | |
561 | { | |
562 | struct fw_csr_iterator ci; | |
563 | struct fw_unit *unit; | |
564 | int key, value, i; | |
565 | ||
566 | i = 0; | |
567 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
568 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
569 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
570 | continue; | |
571 | ||
c781c06d KH |
572 | /* |
573 | * Get the address of the unit directory and try to | |
574 | * match the drivers id_tables against it. | |
575 | */ | |
2d826cc5 | 576 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
577 | if (unit == NULL) { |
578 | fw_error("failed to allocate memory for unit\n"); | |
579 | continue; | |
580 | } | |
581 | ||
582 | unit->directory = ci.p + value - 1; | |
583 | unit->device.bus = &fw_bus_type; | |
21351dbe | 584 | unit->device.type = &fw_unit_type; |
19a15b93 | 585 | unit->device.parent = &device->device; |
2d826cc5 | 586 | snprintf(unit->device.bus_id, sizeof(unit->device.bus_id), |
19a15b93 KH |
587 | "%s.%d", device->device.bus_id, i++); |
588 | ||
6f2e53d5 KH |
589 | init_fw_attribute_group(&unit->device, |
590 | fw_unit_attributes, | |
591 | &unit->attribute_group); | |
7feb9cce KH |
592 | if (device_register(&unit->device) < 0) |
593 | goto skip_unit; | |
594 | ||
7feb9cce KH |
595 | continue; |
596 | ||
7feb9cce KH |
597 | skip_unit: |
598 | kfree(unit); | |
19a15b93 KH |
599 | } |
600 | } | |
601 | ||
602 | static int shutdown_unit(struct device *device, void *data) | |
603 | { | |
21351dbe | 604 | device_unregister(device); |
19a15b93 KH |
605 | |
606 | return 0; | |
607 | } | |
608 | ||
dde2b954 | 609 | static DECLARE_RWSEM(idr_rwsem); |
a3aca3da KH |
610 | static DEFINE_IDR(fw_device_idr); |
611 | int fw_cdev_major; | |
612 | ||
96b19062 | 613 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
614 | { |
615 | struct fw_device *device; | |
616 | ||
dde2b954 | 617 | down_read(&idr_rwsem); |
a3aca3da | 618 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
619 | if (device) |
620 | fw_device_get(device); | |
dde2b954 | 621 | up_read(&idr_rwsem); |
a3aca3da KH |
622 | |
623 | return device; | |
624 | } | |
625 | ||
19a15b93 KH |
626 | static void fw_device_shutdown(struct work_struct *work) |
627 | { | |
628 | struct fw_device *device = | |
629 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
630 | int minor = MINOR(device->device.devt); |
631 | ||
2603bf21 | 632 | fw_device_cdev_remove(device); |
19a15b93 KH |
633 | device_for_each_child(&device->device, NULL, shutdown_unit); |
634 | device_unregister(&device->device); | |
96b19062 SR |
635 | |
636 | down_write(&idr_rwsem); | |
637 | idr_remove(&fw_device_idr, minor); | |
638 | up_write(&idr_rwsem); | |
639 | fw_device_put(device); | |
19a15b93 KH |
640 | } |
641 | ||
21351dbe | 642 | static struct device_type fw_device_type = { |
21351dbe KH |
643 | .release = fw_device_release, |
644 | }; | |
645 | ||
c781c06d KH |
646 | /* |
647 | * These defines control the retry behavior for reading the config | |
19a15b93 KH |
648 | * rom. It shouldn't be necessary to tweak these; if the device |
649 | * doesn't respond to a config rom read within 10 seconds, it's not | |
650 | * going to respond at all. As for the initial delay, a lot of | |
651 | * devices will be able to respond within half a second after bus | |
652 | * reset. On the other hand, it's not really worth being more | |
653 | * aggressive than that, since it scales pretty well; if 10 devices | |
c781c06d KH |
654 | * are plugged in, they're all getting read within one second. |
655 | */ | |
19a15b93 | 656 | |
c5dfd0a5 KH |
657 | #define MAX_RETRIES 10 |
658 | #define RETRY_DELAY (3 * HZ) | |
19a15b93 KH |
659 | #define INITIAL_DELAY (HZ / 2) |
660 | ||
661 | static void fw_device_init(struct work_struct *work) | |
662 | { | |
19a15b93 KH |
663 | struct fw_device *device = |
664 | container_of(work, struct fw_device, work.work); | |
a3aca3da | 665 | int minor, err; |
19a15b93 | 666 | |
c781c06d KH |
667 | /* |
668 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 669 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
670 | * device. |
671 | */ | |
19a15b93 | 672 | |
f8d2dc39 | 673 | if (read_bus_info_block(device, device->generation) < 0) { |
19a15b93 KH |
674 | if (device->config_rom_retries < MAX_RETRIES) { |
675 | device->config_rom_retries++; | |
676 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
677 | } else { | |
907293d7 | 678 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 679 | device->node_id); |
931c4834 KH |
680 | if (device->node == device->card->root_node) |
681 | schedule_delayed_work(&device->card->work, 0); | |
19a15b93 KH |
682 | fw_device_release(&device->device); |
683 | } | |
684 | return; | |
685 | } | |
686 | ||
a3aca3da | 687 | err = -ENOMEM; |
96b19062 SR |
688 | |
689 | fw_device_get(device); | |
dde2b954 | 690 | down_write(&idr_rwsem); |
a3aca3da KH |
691 | if (idr_pre_get(&fw_device_idr, GFP_KERNEL)) |
692 | err = idr_get_new(&fw_device_idr, device, &minor); | |
dde2b954 | 693 | up_write(&idr_rwsem); |
96b19062 | 694 | |
a3aca3da KH |
695 | if (err < 0) |
696 | goto error; | |
697 | ||
19a15b93 | 698 | device->device.bus = &fw_bus_type; |
21351dbe | 699 | device->device.type = &fw_device_type; |
19a15b93 | 700 | device->device.parent = device->card->device; |
a3aca3da | 701 | device->device.devt = MKDEV(fw_cdev_major, minor); |
2d826cc5 | 702 | snprintf(device->device.bus_id, sizeof(device->device.bus_id), |
a3aca3da | 703 | "fw%d", minor); |
19a15b93 | 704 | |
6f2e53d5 KH |
705 | init_fw_attribute_group(&device->device, |
706 | fw_device_attributes, | |
707 | &device->attribute_group); | |
19a15b93 KH |
708 | if (device_add(&device->device)) { |
709 | fw_error("Failed to add device.\n"); | |
a3aca3da | 710 | goto error_with_cdev; |
19a15b93 KH |
711 | } |
712 | ||
19a15b93 KH |
713 | create_units(device); |
714 | ||
c781c06d KH |
715 | /* |
716 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
717 | * out from under us while we did the intialization work, we |
718 | * have to shut down the device again here. Normally, though, | |
719 | * fw_node_event will be responsible for shutting it down when | |
720 | * necessary. We have to use the atomic cmpxchg here to avoid | |
721 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
722 | * fw_node_event(). |
723 | */ | |
641f8791 | 724 | if (atomic_cmpxchg(&device->state, |
19a15b93 KH |
725 | FW_DEVICE_INITIALIZING, |
726 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) | |
727 | fw_device_shutdown(&device->work.work); | |
728 | else | |
f1397490 SR |
729 | fw_notify("created new fw device %s " |
730 | "(%d config rom retries, S%d00)\n", | |
731 | device->device.bus_id, device->config_rom_retries, | |
732 | 1 << device->max_speed); | |
19a15b93 | 733 | |
c781c06d KH |
734 | /* |
735 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
736 | * root node config rom. If this races with a bus reset we |
737 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
738 | * pretty harmless. |
739 | */ | |
19a15b93 KH |
740 | if (device->node == device->card->root_node) |
741 | schedule_delayed_work(&device->card->work, 0); | |
742 | ||
743 | return; | |
744 | ||
a3aca3da | 745 | error_with_cdev: |
dde2b954 | 746 | down_write(&idr_rwsem); |
a3aca3da | 747 | idr_remove(&fw_device_idr, minor); |
dde2b954 | 748 | up_write(&idr_rwsem); |
373b2edd | 749 | error: |
96b19062 SR |
750 | fw_device_put(device); /* fw_device_idr's reference */ |
751 | ||
752 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
753 | } |
754 | ||
755 | static int update_unit(struct device *dev, void *data) | |
756 | { | |
757 | struct fw_unit *unit = fw_unit(dev); | |
758 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
759 | ||
015b066f KH |
760 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
761 | down(&dev->sem); | |
19a15b93 | 762 | driver->update(unit); |
015b066f KH |
763 | up(&dev->sem); |
764 | } | |
19a15b93 KH |
765 | |
766 | return 0; | |
767 | } | |
768 | ||
5f480477 KH |
769 | static void fw_device_update(struct work_struct *work) |
770 | { | |
771 | struct fw_device *device = | |
772 | container_of(work, struct fw_device, work.work); | |
773 | ||
97bd9efa | 774 | fw_device_cdev_update(device); |
5f480477 KH |
775 | device_for_each_child(&device->device, NULL, update_unit); |
776 | } | |
777 | ||
19a15b93 KH |
778 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
779 | { | |
780 | struct fw_device *device; | |
781 | ||
19a15b93 KH |
782 | switch (event) { |
783 | case FW_NODE_CREATED: | |
784 | case FW_NODE_LINK_ON: | |
785 | if (!node->link_on) | |
786 | break; | |
787 | ||
788 | device = kzalloc(sizeof(*device), GFP_ATOMIC); | |
789 | if (device == NULL) | |
790 | break; | |
791 | ||
c781c06d KH |
792 | /* |
793 | * Do minimal intialization of the device here, the | |
19a15b93 KH |
794 | * rest will happen in fw_device_init(). We need the |
795 | * card and node so we can read the config rom and we | |
796 | * need to do device_initialize() now so | |
797 | * device_for_each_child() in FW_NODE_UPDATED is | |
c781c06d KH |
798 | * doesn't freak out. |
799 | */ | |
19a15b93 | 800 | device_initialize(&device->device); |
641f8791 | 801 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
19a15b93 KH |
802 | device->card = fw_card_get(card); |
803 | device->node = fw_node_get(node); | |
804 | device->node_id = node->node_id; | |
805 | device->generation = card->generation; | |
97bd9efa | 806 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 807 | |
c781c06d KH |
808 | /* |
809 | * Set the node data to point back to this device so | |
19a15b93 | 810 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
811 | * and generation for the device. |
812 | */ | |
19a15b93 KH |
813 | node->data = device; |
814 | ||
c781c06d KH |
815 | /* |
816 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
817 | * especially if they are bus powered and go through |
818 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
819 | * first config rom scan half a second after bus reset. |
820 | */ | |
19a15b93 KH |
821 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
822 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
823 | break; | |
824 | ||
825 | case FW_NODE_UPDATED: | |
826 | if (!node->link_on || node->data == NULL) | |
827 | break; | |
828 | ||
829 | device = node->data; | |
830 | device->node_id = node->node_id; | |
b5d2a5e0 | 831 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 832 | device->generation = card->generation; |
5f480477 KH |
833 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
834 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
835 | schedule_delayed_work(&device->work, 0); | |
836 | } | |
19a15b93 KH |
837 | break; |
838 | ||
839 | case FW_NODE_DESTROYED: | |
840 | case FW_NODE_LINK_OFF: | |
841 | if (!node->data) | |
842 | break; | |
843 | ||
c781c06d KH |
844 | /* |
845 | * Destroy the device associated with the node. There | |
19a15b93 KH |
846 | * are two cases here: either the device is fully |
847 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
848 | * process of reading its config rom | |
849 | * (FW_DEVICE_INITIALIZING). If it is fully | |
850 | * initialized we can reuse device->work to schedule a | |
851 | * full fw_device_shutdown(). If not, there's work | |
852 | * scheduled to read it's config rom, and we just put | |
853 | * the device in shutdown state to have that code fail | |
c781c06d KH |
854 | * to create the device. |
855 | */ | |
19a15b93 | 856 | device = node->data; |
641f8791 | 857 | if (atomic_xchg(&device->state, |
5f480477 KH |
858 | FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { |
859 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
19a15b93 KH |
860 | schedule_delayed_work(&device->work, 0); |
861 | } | |
862 | break; | |
863 | } | |
864 | } |