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 | ||
41f321c2 | 21 | #include <linux/ctype.h> |
19a15b93 | 22 | #include <linux/delay.h> |
41f321c2 SR |
23 | #include <linux/device.h> |
24 | #include <linux/errno.h> | |
77c9a5da SR |
25 | #include <linux/firewire.h> |
26 | #include <linux/firewire-constants.h> | |
a3aca3da | 27 | #include <linux/idr.h> |
3d36a0df | 28 | #include <linux/jiffies.h> |
41f321c2 SR |
29 | #include <linux/kobject.h> |
30 | #include <linux/list.h> | |
b3b29888 | 31 | #include <linux/mod_devicetable.h> |
e8ca9702 | 32 | #include <linux/module.h> |
d67cfb96 | 33 | #include <linux/mutex.h> |
6188e10d MW |
34 | #include <linux/rwsem.h> |
35 | #include <linux/semaphore.h> | |
cf417e54 | 36 | #include <linux/spinlock.h> |
41f321c2 SR |
37 | #include <linux/string.h> |
38 | #include <linux/workqueue.h> | |
39 | ||
e8ca9702 SR |
40 | #include <asm/atomic.h> |
41 | #include <asm/byteorder.h> | |
b5d2a5e0 | 42 | #include <asm/system.h> |
41f321c2 | 43 | |
77c9a5da | 44 | #include "core.h" |
19a15b93 KH |
45 | |
46 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
47 | { | |
48 | ci->p = p + 1; | |
49 | ci->end = ci->p + (p[0] >> 16); | |
50 | } | |
19a15b93 KH |
51 | EXPORT_SYMBOL(fw_csr_iterator_init); |
52 | ||
53 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
54 | { | |
55 | *key = *ci->p >> 24; | |
56 | *value = *ci->p & 0xffffff; | |
57 | ||
58 | return ci->p++ < ci->end; | |
59 | } | |
19a15b93 KH |
60 | EXPORT_SYMBOL(fw_csr_iterator_next); |
61 | ||
1f8fef7b CL |
62 | static u32 *search_leaf(u32 *directory, int search_key) |
63 | { | |
64 | struct fw_csr_iterator ci; | |
65 | int last_key = 0, key, value; | |
66 | ||
67 | fw_csr_iterator_init(&ci, directory); | |
68 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
69 | if (last_key == search_key && | |
70 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
71 | return ci.p - 1 + value; | |
3c2c58cb | 72 | |
1f8fef7b CL |
73 | last_key = key; |
74 | } | |
3c2c58cb | 75 | |
1f8fef7b CL |
76 | return NULL; |
77 | } | |
78 | ||
79 | static int textual_leaf_to_string(u32 *block, char *buf, size_t size) | |
80 | { | |
3c2c58cb SR |
81 | unsigned int quadlets, i; |
82 | char c; | |
1f8fef7b CL |
83 | |
84 | if (!size || !buf) | |
85 | return -EINVAL; | |
86 | ||
3c2c58cb | 87 | quadlets = min(block[0] >> 16, 256U); |
1f8fef7b CL |
88 | if (quadlets < 2) |
89 | return -ENODATA; | |
90 | ||
91 | if (block[1] != 0 || block[2] != 0) | |
92 | /* unknown language/character set */ | |
93 | return -ENODATA; | |
94 | ||
95 | block += 3; | |
96 | quadlets -= 2; | |
3c2c58cb SR |
97 | for (i = 0; i < quadlets * 4 && i < size - 1; i++) { |
98 | c = block[i / 4] >> (24 - 8 * (i % 4)); | |
1f8fef7b CL |
99 | if (c == '\0') |
100 | break; | |
3c2c58cb | 101 | buf[i] = c; |
1f8fef7b | 102 | } |
3c2c58cb SR |
103 | buf[i] = '\0'; |
104 | ||
105 | return i; | |
1f8fef7b CL |
106 | } |
107 | ||
108 | /** | |
109 | * fw_csr_string - reads a string from the configuration ROM | |
3c2c58cb | 110 | * @directory: e.g. root directory or unit directory |
1f8fef7b CL |
111 | * @key: the key of the preceding directory entry |
112 | * @buf: where to put the string | |
113 | * @size: size of @buf, in bytes | |
114 | * | |
3c2c58cb SR |
115 | * The string is taken from a minimal ASCII text descriptor leaf after |
116 | * the immediate entry with @key. The string is zero-terminated. | |
117 | * Returns strlen(buf) or a negative error code. | |
1f8fef7b CL |
118 | */ |
119 | int fw_csr_string(u32 *directory, int key, char *buf, size_t size) | |
120 | { | |
121 | u32 *leaf = search_leaf(directory, key); | |
122 | if (!leaf) | |
123 | return -ENOENT; | |
3c2c58cb | 124 | |
1f8fef7b CL |
125 | return textual_leaf_to_string(leaf, buf, size); |
126 | } | |
127 | EXPORT_SYMBOL(fw_csr_string); | |
128 | ||
099d5414 | 129 | static bool is_fw_unit(struct device *dev); |
19a15b93 | 130 | |
e41f8d70 | 131 | static int match_unit_directory(u32 *directory, u32 match_flags, |
b3b29888 | 132 | const struct ieee1394_device_id *id) |
19a15b93 KH |
133 | { |
134 | struct fw_csr_iterator ci; | |
135 | int key, value, match; | |
136 | ||
137 | match = 0; | |
138 | fw_csr_iterator_init(&ci, directory); | |
139 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
b3b29888 SR |
140 | if (key == CSR_VENDOR && value == id->vendor_id) |
141 | match |= IEEE1394_MATCH_VENDOR_ID; | |
142 | if (key == CSR_MODEL && value == id->model_id) | |
143 | match |= IEEE1394_MATCH_MODEL_ID; | |
19a15b93 | 144 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) |
b3b29888 | 145 | match |= IEEE1394_MATCH_SPECIFIER_ID; |
19a15b93 | 146 | if (key == CSR_VERSION && value == id->version) |
b3b29888 | 147 | match |= IEEE1394_MATCH_VERSION; |
19a15b93 KH |
148 | } |
149 | ||
e41f8d70 | 150 | return (match & match_flags) == match_flags; |
19a15b93 KH |
151 | } |
152 | ||
153 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
154 | { | |
155 | struct fw_unit *unit = fw_unit(dev); | |
e41f8d70 SR |
156 | struct fw_device *device; |
157 | const struct ieee1394_device_id *id; | |
19a15b93 KH |
158 | |
159 | /* We only allow binding to fw_units. */ | |
160 | if (!is_fw_unit(dev)) | |
161 | return 0; | |
162 | ||
e5110d01 | 163 | device = fw_parent_device(unit); |
77c9a5da | 164 | id = container_of(drv, struct fw_driver, driver)->id_table; |
e41f8d70 | 165 | |
77c9a5da | 166 | for (; id->match_flags != 0; id++) { |
e41f8d70 SR |
167 | if (match_unit_directory(unit->directory, id->match_flags, id)) |
168 | return 1; | |
169 | ||
170 | /* Also check vendor ID in the root directory. */ | |
171 | if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) && | |
172 | match_unit_directory(&device->config_rom[5], | |
173 | IEEE1394_MATCH_VENDOR_ID, id) && | |
174 | match_unit_directory(unit->directory, id->match_flags | |
175 | & ~IEEE1394_MATCH_VENDOR_ID, id)) | |
19a15b93 KH |
176 | return 1; |
177 | } | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
183 | { | |
e5110d01 | 184 | struct fw_device *device = fw_parent_device(unit); |
19a15b93 KH |
185 | struct fw_csr_iterator ci; |
186 | ||
187 | int key, value; | |
188 | int vendor = 0; | |
189 | int model = 0; | |
190 | int specifier_id = 0; | |
191 | int version = 0; | |
192 | ||
193 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
194 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
195 | switch (key) { | |
196 | case CSR_VENDOR: | |
197 | vendor = value; | |
198 | break; | |
199 | case CSR_MODEL: | |
200 | model = value; | |
201 | break; | |
202 | } | |
203 | } | |
204 | ||
205 | fw_csr_iterator_init(&ci, unit->directory); | |
206 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
207 | switch (key) { | |
208 | case CSR_SPECIFIER_ID: | |
209 | specifier_id = value; | |
210 | break; | |
211 | case CSR_VERSION: | |
212 | version = value; | |
213 | break; | |
214 | } | |
215 | } | |
216 | ||
217 | return snprintf(buffer, buffer_size, | |
218 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
219 | vendor, model, specifier_id, version); | |
220 | } | |
221 | ||
53dca511 | 222 | static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
223 | { |
224 | struct fw_unit *unit = fw_unit(dev); | |
225 | char modalias[64]; | |
19a15b93 | 226 | |
2d826cc5 | 227 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 228 | |
7eff2e7a | 229 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
230 | return -ENOMEM; |
231 | ||
19a15b93 KH |
232 | return 0; |
233 | } | |
234 | ||
235 | struct bus_type fw_bus_type = { | |
362c2c8c | 236 | .name = "firewire", |
19a15b93 | 237 | .match = fw_unit_match, |
19a15b93 | 238 | }; |
19a15b93 KH |
239 | EXPORT_SYMBOL(fw_bus_type); |
240 | ||
19a15b93 KH |
241 | int fw_device_enable_phys_dma(struct fw_device *device) |
242 | { | |
b5d2a5e0 SR |
243 | int generation = device->generation; |
244 | ||
245 | /* device->node_id, accessed below, must not be older than generation */ | |
246 | smp_rmb(); | |
247 | ||
19a15b93 KH |
248 | return device->card->driver->enable_phys_dma(device->card, |
249 | device->node_id, | |
b5d2a5e0 | 250 | generation); |
19a15b93 | 251 | } |
19a15b93 KH |
252 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
253 | ||
7feb9cce KH |
254 | struct config_rom_attribute { |
255 | struct device_attribute attr; | |
256 | u32 key; | |
257 | }; | |
258 | ||
53dca511 SR |
259 | static ssize_t show_immediate(struct device *dev, |
260 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
261 | { |
262 | struct config_rom_attribute *attr = | |
263 | container_of(dattr, struct config_rom_attribute, attr); | |
264 | struct fw_csr_iterator ci; | |
265 | u32 *dir; | |
c9755e14 SR |
266 | int key, value, ret = -ENOENT; |
267 | ||
268 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
269 | |
270 | if (is_fw_unit(dev)) | |
271 | dir = fw_unit(dev)->directory; | |
272 | else | |
273 | dir = fw_device(dev)->config_rom + 5; | |
274 | ||
275 | fw_csr_iterator_init(&ci, dir); | |
276 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
277 | if (attr->key == key) { |
278 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
279 | "0x%06x\n", value); | |
280 | break; | |
281 | } | |
282 | ||
283 | up_read(&fw_device_rwsem); | |
7feb9cce | 284 | |
c9755e14 | 285 | return ret; |
7feb9cce KH |
286 | } |
287 | ||
288 | #define IMMEDIATE_ATTR(name, key) \ | |
289 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
290 | ||
53dca511 SR |
291 | static ssize_t show_text_leaf(struct device *dev, |
292 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
293 | { |
294 | struct config_rom_attribute *attr = | |
295 | container_of(dattr, struct config_rom_attribute, attr); | |
1f8fef7b CL |
296 | u32 *dir; |
297 | size_t bufsize; | |
298 | char dummy_buf[2]; | |
299 | int ret; | |
7feb9cce | 300 | |
c9755e14 SR |
301 | down_read(&fw_device_rwsem); |
302 | ||
7feb9cce KH |
303 | if (is_fw_unit(dev)) |
304 | dir = fw_unit(dev)->directory; | |
305 | else | |
306 | dir = fw_device(dev)->config_rom + 5; | |
307 | ||
1f8fef7b CL |
308 | if (buf) { |
309 | bufsize = PAGE_SIZE - 1; | |
310 | } else { | |
311 | buf = dummy_buf; | |
312 | bufsize = 1; | |
7feb9cce KH |
313 | } |
314 | ||
1f8fef7b | 315 | ret = fw_csr_string(dir, attr->key, buf, bufsize); |
7feb9cce | 316 | |
1f8fef7b CL |
317 | if (ret >= 0) { |
318 | /* Strip trailing whitespace and add newline. */ | |
319 | while (ret > 0 && isspace(buf[ret - 1])) | |
320 | ret--; | |
321 | strcpy(buf + ret, "\n"); | |
322 | ret++; | |
c9755e14 | 323 | } |
7feb9cce | 324 | |
c9755e14 | 325 | up_read(&fw_device_rwsem); |
7feb9cce | 326 | |
c9755e14 | 327 | return ret; |
7feb9cce KH |
328 | } |
329 | ||
330 | #define TEXT_LEAF_ATTR(name, key) \ | |
331 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
332 | ||
333 | static struct config_rom_attribute config_rom_attributes[] = { | |
334 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
335 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
336 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
337 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
338 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
339 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
340 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
341 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
342 | }; | |
343 | ||
53dca511 SR |
344 | static void init_fw_attribute_group(struct device *dev, |
345 | struct device_attribute *attrs, | |
346 | struct fw_attribute_group *group) | |
7feb9cce KH |
347 | { |
348 | struct device_attribute *attr; | |
6f2e53d5 KH |
349 | int i, j; |
350 | ||
351 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
352 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
353 | |
354 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
355 | attr = &config_rom_attributes[i].attr; | |
356 | if (attr->show(dev, attr, NULL) < 0) | |
357 | continue; | |
6f2e53d5 | 358 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
359 | } |
360 | ||
e5333db9 | 361 | group->attrs[j] = NULL; |
6f2e53d5 KH |
362 | group->groups[0] = &group->group; |
363 | group->groups[1] = NULL; | |
364 | group->group.attrs = group->attrs; | |
a4dbd674 | 365 | dev->groups = (const struct attribute_group **) group->groups; |
7feb9cce KH |
366 | } |
367 | ||
53dca511 SR |
368 | static ssize_t modalias_show(struct device *dev, |
369 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
370 | { |
371 | struct fw_unit *unit = fw_unit(dev); | |
372 | int length; | |
373 | ||
374 | length = get_modalias(unit, buf, PAGE_SIZE); | |
375 | strcpy(buf + length, "\n"); | |
376 | ||
377 | return length + 1; | |
378 | } | |
379 | ||
53dca511 SR |
380 | static ssize_t rom_index_show(struct device *dev, |
381 | struct device_attribute *attr, char *buf) | |
19a15b93 | 382 | { |
21351dbe KH |
383 | struct fw_device *device = fw_device(dev->parent); |
384 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 385 | |
21351dbe KH |
386 | return snprintf(buf, PAGE_SIZE, "%d\n", |
387 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
388 | } |
389 | ||
21351dbe KH |
390 | static struct device_attribute fw_unit_attributes[] = { |
391 | __ATTR_RO(modalias), | |
392 | __ATTR_RO(rom_index), | |
393 | __ATTR_NULL, | |
19a15b93 KH |
394 | }; |
395 | ||
53dca511 SR |
396 | static ssize_t config_rom_show(struct device *dev, |
397 | struct device_attribute *attr, char *buf) | |
048961ef | 398 | { |
21351dbe | 399 | struct fw_device *device = fw_device(dev); |
c9755e14 | 400 | size_t length; |
048961ef | 401 | |
c9755e14 SR |
402 | down_read(&fw_device_rwsem); |
403 | length = device->config_rom_length * 4; | |
404 | memcpy(buf, device->config_rom, length); | |
405 | up_read(&fw_device_rwsem); | |
21351dbe | 406 | |
c9755e14 | 407 | return length; |
048961ef KH |
408 | } |
409 | ||
53dca511 SR |
410 | static ssize_t guid_show(struct device *dev, |
411 | struct device_attribute *attr, char *buf) | |
bbd14945 KH |
412 | { |
413 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
414 | int ret; |
415 | ||
416 | down_read(&fw_device_rwsem); | |
417 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
418 | device->config_rom[3], device->config_rom[4]); | |
419 | up_read(&fw_device_rwsem); | |
bbd14945 | 420 | |
c9755e14 | 421 | return ret; |
bbd14945 KH |
422 | } |
423 | ||
0210b66d SR |
424 | static int units_sprintf(char *buf, u32 *directory) |
425 | { | |
426 | struct fw_csr_iterator ci; | |
427 | int key, value; | |
428 | int specifier_id = 0; | |
429 | int version = 0; | |
430 | ||
431 | fw_csr_iterator_init(&ci, directory); | |
432 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
433 | switch (key) { | |
434 | case CSR_SPECIFIER_ID: | |
435 | specifier_id = value; | |
436 | break; | |
437 | case CSR_VERSION: | |
438 | version = value; | |
439 | break; | |
440 | } | |
441 | } | |
442 | ||
443 | return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version); | |
444 | } | |
445 | ||
446 | static ssize_t units_show(struct device *dev, | |
447 | struct device_attribute *attr, char *buf) | |
448 | { | |
449 | struct fw_device *device = fw_device(dev); | |
450 | struct fw_csr_iterator ci; | |
451 | int key, value, i = 0; | |
452 | ||
453 | down_read(&fw_device_rwsem); | |
454 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
455 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
456 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
457 | continue; | |
458 | i += units_sprintf(&buf[i], ci.p + value - 1); | |
459 | if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) | |
460 | break; | |
461 | } | |
462 | up_read(&fw_device_rwsem); | |
463 | ||
464 | if (i) | |
465 | buf[i - 1] = '\n'; | |
466 | ||
467 | return i; | |
468 | } | |
469 | ||
21351dbe KH |
470 | static struct device_attribute fw_device_attributes[] = { |
471 | __ATTR_RO(config_rom), | |
bbd14945 | 472 | __ATTR_RO(guid), |
0210b66d | 473 | __ATTR_RO(units), |
21351dbe | 474 | __ATTR_NULL, |
048961ef KH |
475 | }; |
476 | ||
53dca511 SR |
477 | static int read_rom(struct fw_device *device, |
478 | int generation, int index, u32 *data) | |
19a15b93 | 479 | { |
1e119fa9 | 480 | int rcode; |
b5d2a5e0 SR |
481 | |
482 | /* device->node_id, accessed below, must not be older than generation */ | |
483 | smp_rmb(); | |
19a15b93 | 484 | |
1e119fa9 | 485 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 486 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
487 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
488 | data, 4); | |
489 | be32_to_cpus(data); | |
19a15b93 | 490 | |
1e119fa9 | 491 | return rcode; |
19a15b93 KH |
492 | } |
493 | ||
1dadff71 SR |
494 | #define READ_BIB_ROM_SIZE 256 |
495 | #define READ_BIB_STACK_SIZE 16 | |
496 | ||
f8d2dc39 SR |
497 | /* |
498 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
499 | * the config ROM. We do all this with a cached bus generation. If the bus | |
500 | * generation changes under us, read_bus_info_block will fail and get retried. | |
501 | * It's better to start all over in this case because the node from which we | |
502 | * are reading the ROM may have changed the ROM during the reset. | |
503 | */ | |
504 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 505 | { |
c9755e14 | 506 | u32 *rom, *stack, *old_rom, *new_rom; |
1dadff71 SR |
507 | u32 sp, key; |
508 | int i, end, length, ret = -1; | |
509 | ||
510 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
511 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
512 | if (rom == NULL) | |
513 | return -ENOMEM; | |
514 | ||
515 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 516 | |
f1397490 SR |
517 | device->max_speed = SCODE_100; |
518 | ||
19a15b93 KH |
519 | /* First read the bus info block. */ |
520 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 521 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 522 | goto out; |
c781c06d KH |
523 | /* |
524 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
525 | * reply with a 0 for the first quadlet of the config |
526 | * rom to indicate that they are booting (for example, | |
527 | * if the firmware is on the disk of a external | |
528 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
529 | * retry mechanism will try again later. |
530 | */ | |
19a15b93 | 531 | if (i == 0 && rom[i] == 0) |
1dadff71 | 532 | goto out; |
19a15b93 KH |
533 | } |
534 | ||
f1397490 SR |
535 | device->max_speed = device->node->max_speed; |
536 | ||
537 | /* | |
538 | * Determine the speed of | |
539 | * - devices with link speed less than PHY speed, | |
540 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
541 | * - all devices if there are 1394b repeaters. | |
542 | * Note, we cannot use the bus info block's link_spd as starting point | |
543 | * because some buggy firmwares set it lower than necessary and because | |
544 | * 1394-1995 nodes do not have the field. | |
545 | */ | |
546 | if ((rom[2] & 0x7) < device->max_speed || | |
547 | device->max_speed == SCODE_BETA || | |
548 | device->card->beta_repeaters_present) { | |
549 | u32 dummy; | |
550 | ||
551 | /* for S1600 and S3200 */ | |
552 | if (device->max_speed == SCODE_BETA) | |
553 | device->max_speed = device->card->link_speed; | |
554 | ||
555 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
556 | if (read_rom(device, generation, 0, &dummy) == |
557 | RCODE_COMPLETE) | |
f1397490 SR |
558 | break; |
559 | device->max_speed--; | |
560 | } | |
561 | } | |
562 | ||
c781c06d KH |
563 | /* |
564 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
565 | * directory structure so we parse it using a stack of |
566 | * references to the blocks that make up the structure. We | |
567 | * push a reference to the root directory on the stack to | |
c781c06d KH |
568 | * start things off. |
569 | */ | |
19a15b93 KH |
570 | length = i; |
571 | sp = 0; | |
572 | stack[sp++] = 0xc0000005; | |
573 | while (sp > 0) { | |
c781c06d KH |
574 | /* |
575 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
576 | * lower 24 bits is the offset into the config rom, |
577 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
578 | * block. |
579 | */ | |
19a15b93 KH |
580 | key = stack[--sp]; |
581 | i = key & 0xffffff; | |
1dadff71 | 582 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
583 | /* |
584 | * The reference points outside the standard | |
585 | * config rom area, something's fishy. | |
586 | */ | |
1dadff71 | 587 | goto out; |
19a15b93 KH |
588 | |
589 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 590 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 591 | goto out; |
19a15b93 KH |
592 | end = i + (rom[i] >> 16) + 1; |
593 | i++; | |
1dadff71 | 594 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
595 | /* |
596 | * This block extends outside standard config | |
19a15b93 KH |
597 | * area (and the array we're reading it |
598 | * into). That's broken, so ignore this | |
c781c06d KH |
599 | * device. |
600 | */ | |
1dadff71 | 601 | goto out; |
19a15b93 | 602 | |
c781c06d KH |
603 | /* |
604 | * Now read in the block. If this is a directory | |
19a15b93 | 605 | * block, check the entries as we read them to see if |
c781c06d KH |
606 | * it references another block, and push it in that case. |
607 | */ | |
19a15b93 | 608 | while (i < end) { |
f8d2dc39 SR |
609 | if (read_rom(device, generation, i, &rom[i]) != |
610 | RCODE_COMPLETE) | |
1dadff71 | 611 | goto out; |
19a15b93 | 612 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 613 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
614 | stack[sp++] = i + rom[i]; |
615 | i++; | |
616 | } | |
617 | if (length < i) | |
618 | length = i; | |
619 | } | |
620 | ||
c9755e14 SR |
621 | old_rom = device->config_rom; |
622 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
623 | if (new_rom == NULL) | |
1dadff71 | 624 | goto out; |
c9755e14 SR |
625 | |
626 | down_write(&fw_device_rwsem); | |
627 | device->config_rom = new_rom; | |
19a15b93 | 628 | device->config_rom_length = length; |
c9755e14 SR |
629 | up_write(&fw_device_rwsem); |
630 | ||
631 | kfree(old_rom); | |
1dadff71 | 632 | ret = 0; |
837ec787 SR |
633 | device->max_rec = rom[2] >> 12 & 0xf; |
634 | device->cmc = rom[2] >> 30 & 1; | |
635 | device->irmc = rom[2] >> 31 & 1; | |
1dadff71 SR |
636 | out: |
637 | kfree(rom); | |
19a15b93 | 638 | |
1dadff71 | 639 | return ret; |
19a15b93 KH |
640 | } |
641 | ||
642 | static void fw_unit_release(struct device *dev) | |
643 | { | |
644 | struct fw_unit *unit = fw_unit(dev); | |
645 | ||
646 | kfree(unit); | |
647 | } | |
648 | ||
21351dbe | 649 | static struct device_type fw_unit_type = { |
21351dbe KH |
650 | .uevent = fw_unit_uevent, |
651 | .release = fw_unit_release, | |
652 | }; | |
653 | ||
099d5414 | 654 | static bool is_fw_unit(struct device *dev) |
19a15b93 | 655 | { |
21351dbe | 656 | return dev->type == &fw_unit_type; |
19a15b93 KH |
657 | } |
658 | ||
659 | static void create_units(struct fw_device *device) | |
660 | { | |
661 | struct fw_csr_iterator ci; | |
662 | struct fw_unit *unit; | |
663 | int key, value, i; | |
664 | ||
665 | i = 0; | |
666 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
667 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
668 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
669 | continue; | |
670 | ||
c781c06d KH |
671 | /* |
672 | * Get the address of the unit directory and try to | |
673 | * match the drivers id_tables against it. | |
674 | */ | |
2d826cc5 | 675 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
676 | if (unit == NULL) { |
677 | fw_error("failed to allocate memory for unit\n"); | |
678 | continue; | |
679 | } | |
680 | ||
681 | unit->directory = ci.p + value - 1; | |
682 | unit->device.bus = &fw_bus_type; | |
21351dbe | 683 | unit->device.type = &fw_unit_type; |
19a15b93 | 684 | unit->device.parent = &device->device; |
a1f64819 | 685 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 686 | |
e5333db9 SR |
687 | BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) < |
688 | ARRAY_SIZE(fw_unit_attributes) + | |
689 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
690 | init_fw_attribute_group(&unit->device, |
691 | fw_unit_attributes, | |
692 | &unit->attribute_group); | |
e5333db9 | 693 | |
7feb9cce KH |
694 | if (device_register(&unit->device) < 0) |
695 | goto skip_unit; | |
696 | ||
7feb9cce KH |
697 | continue; |
698 | ||
7feb9cce KH |
699 | skip_unit: |
700 | kfree(unit); | |
19a15b93 KH |
701 | } |
702 | } | |
703 | ||
704 | static int shutdown_unit(struct device *device, void *data) | |
705 | { | |
21351dbe | 706 | device_unregister(device); |
19a15b93 KH |
707 | |
708 | return 0; | |
709 | } | |
710 | ||
c9755e14 SR |
711 | /* |
712 | * fw_device_rwsem acts as dual purpose mutex: | |
713 | * - serializes accesses to fw_device_idr, | |
714 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
715 | * fw_unit.directory, unless those accesses happen at safe occasions | |
716 | */ | |
717 | DECLARE_RWSEM(fw_device_rwsem); | |
718 | ||
d6053e08 | 719 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
720 | int fw_cdev_major; |
721 | ||
96b19062 | 722 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
723 | { |
724 | struct fw_device *device; | |
725 | ||
c9755e14 | 726 | down_read(&fw_device_rwsem); |
a3aca3da | 727 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
728 | if (device) |
729 | fw_device_get(device); | |
c9755e14 | 730 | up_read(&fw_device_rwsem); |
a3aca3da KH |
731 | |
732 | return device; | |
733 | } | |
734 | ||
3d36a0df SR |
735 | /* |
736 | * These defines control the retry behavior for reading the config | |
737 | * rom. It shouldn't be necessary to tweak these; if the device | |
738 | * doesn't respond to a config rom read within 10 seconds, it's not | |
739 | * going to respond at all. As for the initial delay, a lot of | |
740 | * devices will be able to respond within half a second after bus | |
741 | * reset. On the other hand, it's not really worth being more | |
742 | * aggressive than that, since it scales pretty well; if 10 devices | |
743 | * are plugged in, they're all getting read within one second. | |
744 | */ | |
745 | ||
746 | #define MAX_RETRIES 10 | |
747 | #define RETRY_DELAY (3 * HZ) | |
748 | #define INITIAL_DELAY (HZ / 2) | |
749 | #define SHUTDOWN_DELAY (2 * HZ) | |
750 | ||
19a15b93 KH |
751 | static void fw_device_shutdown(struct work_struct *work) |
752 | { | |
753 | struct fw_device *device = | |
754 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
755 | int minor = MINOR(device->device.devt); |
756 | ||
e747a5c0 SR |
757 | if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) |
758 | && !list_empty(&device->card->link)) { | |
3d36a0df SR |
759 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); |
760 | return; | |
761 | } | |
762 | ||
763 | if (atomic_cmpxchg(&device->state, | |
764 | FW_DEVICE_GONE, | |
765 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
766 | return; | |
767 | ||
2603bf21 | 768 | fw_device_cdev_remove(device); |
19a15b93 KH |
769 | device_for_each_child(&device->device, NULL, shutdown_unit); |
770 | device_unregister(&device->device); | |
96b19062 | 771 | |
c9755e14 | 772 | down_write(&fw_device_rwsem); |
96b19062 | 773 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 774 | up_write(&fw_device_rwsem); |
3d36a0df | 775 | |
96b19062 | 776 | fw_device_put(device); |
19a15b93 KH |
777 | } |
778 | ||
aed80892 SR |
779 | static void fw_device_release(struct device *dev) |
780 | { | |
781 | struct fw_device *device = fw_device(dev); | |
782 | struct fw_card *card = device->card; | |
783 | unsigned long flags; | |
784 | ||
785 | /* | |
786 | * Take the card lock so we don't set this to NULL while a | |
787 | * FW_NODE_UPDATED callback is being handled or while the | |
788 | * bus manager work looks at this node. | |
789 | */ | |
790 | spin_lock_irqsave(&card->lock, flags); | |
791 | device->node->data = NULL; | |
792 | spin_unlock_irqrestore(&card->lock, flags); | |
793 | ||
794 | fw_node_put(device->node); | |
795 | kfree(device->config_rom); | |
796 | kfree(device); | |
797 | fw_card_put(card); | |
798 | } | |
799 | ||
21351dbe | 800 | static struct device_type fw_device_type = { |
aed80892 | 801 | .release = fw_device_release, |
21351dbe KH |
802 | }; |
803 | ||
099d5414 SR |
804 | static bool is_fw_device(struct device *dev) |
805 | { | |
806 | return dev->type == &fw_device_type; | |
807 | } | |
808 | ||
aed80892 SR |
809 | static int update_unit(struct device *dev, void *data) |
810 | { | |
811 | struct fw_unit *unit = fw_unit(dev); | |
812 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
813 | ||
814 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { | |
815 | down(&dev->sem); | |
816 | driver->update(unit); | |
817 | up(&dev->sem); | |
818 | } | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
823 | static void fw_device_update(struct work_struct *work) | |
824 | { | |
825 | struct fw_device *device = | |
826 | container_of(work, struct fw_device, work.work); | |
827 | ||
828 | fw_device_cdev_update(device); | |
829 | device_for_each_child(&device->device, NULL, update_unit); | |
830 | } | |
3d36a0df | 831 | |
c781c06d | 832 | /* |
3d36a0df SR |
833 | * If a device was pending for deletion because its node went away but its |
834 | * bus info block and root directory header matches that of a newly discovered | |
835 | * device, revive the existing fw_device. | |
836 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 837 | */ |
3d36a0df SR |
838 | static int lookup_existing_device(struct device *dev, void *data) |
839 | { | |
840 | struct fw_device *old = fw_device(dev); | |
841 | struct fw_device *new = data; | |
842 | struct fw_card *card = new->card; | |
843 | int match = 0; | |
844 | ||
099d5414 SR |
845 | if (!is_fw_device(dev)) |
846 | return 0; | |
847 | ||
3d36a0df SR |
848 | down_read(&fw_device_rwsem); /* serialize config_rom access */ |
849 | spin_lock_irq(&card->lock); /* serialize node access */ | |
850 | ||
851 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
852 | atomic_cmpxchg(&old->state, | |
853 | FW_DEVICE_GONE, | |
854 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
855 | struct fw_node *current_node = new->node; | |
856 | struct fw_node *obsolete_node = old->node; | |
857 | ||
858 | new->node = obsolete_node; | |
859 | new->node->data = new; | |
860 | old->node = current_node; | |
861 | old->node->data = old; | |
862 | ||
863 | old->max_speed = new->max_speed; | |
864 | old->node_id = current_node->node_id; | |
865 | smp_wmb(); /* update node_id before generation */ | |
866 | old->generation = card->generation; | |
867 | old->config_rom_retries = 0; | |
868 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 869 | |
3d36a0df SR |
870 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
871 | schedule_delayed_work(&old->work, 0); | |
872 | ||
873 | if (current_node == card->root_node) | |
874 | fw_schedule_bm_work(card, 0); | |
875 | ||
876 | match = 1; | |
877 | } | |
878 | ||
879 | spin_unlock_irq(&card->lock); | |
880 | up_read(&fw_device_rwsem); | |
881 | ||
882 | return match; | |
883 | } | |
19a15b93 | 884 | |
7889b60e SR |
885 | enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; |
886 | ||
099d5414 | 887 | static void set_broadcast_channel(struct fw_device *device, int generation) |
7889b60e SR |
888 | { |
889 | struct fw_card *card = device->card; | |
890 | __be32 data; | |
891 | int rcode; | |
892 | ||
893 | if (!card->broadcast_channel_allocated) | |
894 | return; | |
895 | ||
837ec787 SR |
896 | /* |
897 | * The Broadcast_Channel Valid bit is required by nodes which want to | |
898 | * transmit on this channel. Such transmissions are practically | |
899 | * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required | |
900 | * to be IRM capable and have a max_rec of 8 or more. We use this fact | |
901 | * to narrow down to which nodes we send Broadcast_Channel updates. | |
902 | */ | |
903 | if (!device->irmc || device->max_rec < 8) | |
904 | return; | |
905 | ||
906 | /* | |
907 | * Some 1394-1995 nodes crash if this 1394a-2000 register is written. | |
908 | * Perform a read test first. | |
909 | */ | |
7889b60e SR |
910 | if (device->bc_implemented == BC_UNKNOWN) { |
911 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, | |
912 | device->node_id, generation, device->max_speed, | |
913 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
914 | &data, 4); | |
915 | switch (rcode) { | |
916 | case RCODE_COMPLETE: | |
917 | if (data & cpu_to_be32(1 << 31)) { | |
918 | device->bc_implemented = BC_IMPLEMENTED; | |
919 | break; | |
920 | } | |
921 | /* else fall through to case address error */ | |
922 | case RCODE_ADDRESS_ERROR: | |
923 | device->bc_implemented = BC_UNIMPLEMENTED; | |
924 | } | |
925 | } | |
926 | ||
927 | if (device->bc_implemented == BC_IMPLEMENTED) { | |
928 | data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | | |
929 | BROADCAST_CHANNEL_VALID); | |
930 | fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, | |
931 | device->node_id, generation, device->max_speed, | |
932 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
933 | &data, 4); | |
934 | } | |
935 | } | |
936 | ||
099d5414 SR |
937 | int fw_device_set_broadcast_channel(struct device *dev, void *gen) |
938 | { | |
939 | if (is_fw_device(dev)) | |
940 | set_broadcast_channel(fw_device(dev), (long)gen); | |
941 | ||
942 | return 0; | |
943 | } | |
944 | ||
19a15b93 KH |
945 | static void fw_device_init(struct work_struct *work) |
946 | { | |
19a15b93 KH |
947 | struct fw_device *device = |
948 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 949 | struct device *revived_dev; |
e1eff7a3 | 950 | int minor, ret; |
19a15b93 | 951 | |
c781c06d KH |
952 | /* |
953 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 954 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
955 | * device. |
956 | */ | |
19a15b93 | 957 | |
f8d2dc39 | 958 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
959 | if (device->config_rom_retries < MAX_RETRIES && |
960 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
961 | device->config_rom_retries++; |
962 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
963 | } else { | |
907293d7 | 964 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 965 | device->node_id); |
931c4834 | 966 | if (device->node == device->card->root_node) |
0fa1986f | 967 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
968 | fw_device_release(&device->device); |
969 | } | |
970 | return; | |
971 | } | |
972 | ||
3d36a0df SR |
973 | revived_dev = device_find_child(device->card->device, |
974 | device, lookup_existing_device); | |
975 | if (revived_dev) { | |
976 | put_device(revived_dev); | |
977 | fw_device_release(&device->device); | |
978 | ||
979 | return; | |
980 | } | |
981 | ||
62305823 | 982 | device_initialize(&device->device); |
96b19062 SR |
983 | |
984 | fw_device_get(device); | |
c9755e14 | 985 | down_write(&fw_device_rwsem); |
e1eff7a3 | 986 | ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
62305823 SR |
987 | idr_get_new(&fw_device_idr, device, &minor) : |
988 | -ENOMEM; | |
c9755e14 | 989 | up_write(&fw_device_rwsem); |
96b19062 | 990 | |
e1eff7a3 | 991 | if (ret < 0) |
a3aca3da KH |
992 | goto error; |
993 | ||
19a15b93 | 994 | device->device.bus = &fw_bus_type; |
21351dbe | 995 | device->device.type = &fw_device_type; |
19a15b93 | 996 | device->device.parent = device->card->device; |
a3aca3da | 997 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 998 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 999 | |
e5333db9 SR |
1000 | BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) < |
1001 | ARRAY_SIZE(fw_device_attributes) + | |
1002 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
1003 | init_fw_attribute_group(&device->device, |
1004 | fw_device_attributes, | |
1005 | &device->attribute_group); | |
e5333db9 | 1006 | |
19a15b93 KH |
1007 | if (device_add(&device->device)) { |
1008 | fw_error("Failed to add device.\n"); | |
a3aca3da | 1009 | goto error_with_cdev; |
19a15b93 KH |
1010 | } |
1011 | ||
19a15b93 KH |
1012 | create_units(device); |
1013 | ||
c781c06d KH |
1014 | /* |
1015 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
1016 | * out from under us while we did the intialization work, we |
1017 | * have to shut down the device again here. Normally, though, | |
1018 | * fw_node_event will be responsible for shutting it down when | |
1019 | * necessary. We have to use the atomic cmpxchg here to avoid | |
1020 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
1021 | * fw_node_event(). |
1022 | */ | |
641f8791 | 1023 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1024 | FW_DEVICE_INITIALIZING, |
1025 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
1026 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
1027 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
fa6e697b SR |
1028 | } else { |
1029 | if (device->config_rom_retries) | |
1030 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
1031 | "%d config ROM retries\n", | |
a1f64819 | 1032 | dev_name(&device->device), |
fa6e697b SR |
1033 | device->config_rom[3], device->config_rom[4], |
1034 | 1 << device->max_speed, | |
1035 | device->config_rom_retries); | |
1036 | else | |
1037 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 1038 | dev_name(&device->device), |
fa6e697b SR |
1039 | device->config_rom[3], device->config_rom[4], |
1040 | 1 << device->max_speed); | |
c9755e14 | 1041 | device->config_rom_retries = 0; |
7889b60e | 1042 | |
099d5414 | 1043 | set_broadcast_channel(device, device->generation); |
fa6e697b | 1044 | } |
19a15b93 | 1045 | |
c781c06d KH |
1046 | /* |
1047 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
1048 | * root node config rom. If this races with a bus reset we |
1049 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
1050 | * pretty harmless. |
1051 | */ | |
19a15b93 | 1052 | if (device->node == device->card->root_node) |
0fa1986f | 1053 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
1054 | |
1055 | return; | |
1056 | ||
a3aca3da | 1057 | error_with_cdev: |
c9755e14 | 1058 | down_write(&fw_device_rwsem); |
a3aca3da | 1059 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 1060 | up_write(&fw_device_rwsem); |
373b2edd | 1061 | error: |
96b19062 SR |
1062 | fw_device_put(device); /* fw_device_idr's reference */ |
1063 | ||
1064 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
1065 | } |
1066 | ||
c9755e14 SR |
1067 | enum { |
1068 | REREAD_BIB_ERROR, | |
1069 | REREAD_BIB_GONE, | |
1070 | REREAD_BIB_UNCHANGED, | |
1071 | REREAD_BIB_CHANGED, | |
1072 | }; | |
1073 | ||
1074 | /* Reread and compare bus info block and header of root directory */ | |
1075 | static int reread_bus_info_block(struct fw_device *device, int generation) | |
1076 | { | |
1077 | u32 q; | |
1078 | int i; | |
1079 | ||
1080 | for (i = 0; i < 6; i++) { | |
1081 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
1082 | return REREAD_BIB_ERROR; | |
1083 | ||
1084 | if (i == 0 && q == 0) | |
1085 | return REREAD_BIB_GONE; | |
1086 | ||
d01b0178 | 1087 | if (q != device->config_rom[i]) |
c9755e14 SR |
1088 | return REREAD_BIB_CHANGED; |
1089 | } | |
1090 | ||
1091 | return REREAD_BIB_UNCHANGED; | |
1092 | } | |
1093 | ||
1094 | static void fw_device_refresh(struct work_struct *work) | |
1095 | { | |
1096 | struct fw_device *device = | |
1097 | container_of(work, struct fw_device, work.work); | |
1098 | struct fw_card *card = device->card; | |
1099 | int node_id = device->node_id; | |
1100 | ||
1101 | switch (reread_bus_info_block(device, device->generation)) { | |
1102 | case REREAD_BIB_ERROR: | |
1103 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
1104 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1105 | device->config_rom_retries++; | |
1106 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
1107 | ||
1108 | return; | |
1109 | } | |
1110 | goto give_up; | |
1111 | ||
1112 | case REREAD_BIB_GONE: | |
1113 | goto gone; | |
1114 | ||
1115 | case REREAD_BIB_UNCHANGED: | |
1116 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
1117 | FW_DEVICE_INITIALIZING, |
1118 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1119 | goto gone; |
1120 | ||
1121 | fw_device_update(work); | |
1122 | device->config_rom_retries = 0; | |
1123 | goto out; | |
1124 | ||
1125 | case REREAD_BIB_CHANGED: | |
1126 | break; | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * Something changed. We keep things simple and don't investigate | |
1131 | * further. We just destroy all previous units and create new ones. | |
1132 | */ | |
1133 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
1134 | ||
1135 | if (read_bus_info_block(device, device->generation) < 0) { | |
1136 | if (device->config_rom_retries < MAX_RETRIES && | |
1137 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1138 | device->config_rom_retries++; | |
1139 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
1140 | ||
1141 | return; | |
1142 | } | |
1143 | goto give_up; | |
1144 | } | |
1145 | ||
1146 | create_units(device); | |
1147 | ||
0210b66d SR |
1148 | /* Userspace may want to re-read attributes. */ |
1149 | kobject_uevent(&device->device.kobj, KOBJ_CHANGE); | |
1150 | ||
c9755e14 | 1151 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1152 | FW_DEVICE_INITIALIZING, |
1153 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1154 | goto gone; |
1155 | ||
a1f64819 | 1156 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
1157 | device->config_rom_retries = 0; |
1158 | goto out; | |
1159 | ||
1160 | give_up: | |
a1f64819 | 1161 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 1162 | gone: |
3d36a0df SR |
1163 | atomic_set(&device->state, FW_DEVICE_GONE); |
1164 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
1165 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
c9755e14 SR |
1166 | out: |
1167 | if (node_id == card->root_node->node_id) | |
0fa1986f | 1168 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
1169 | } |
1170 | ||
19a15b93 KH |
1171 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
1172 | { | |
1173 | struct fw_device *device; | |
1174 | ||
19a15b93 KH |
1175 | switch (event) { |
1176 | case FW_NODE_CREATED: | |
1177 | case FW_NODE_LINK_ON: | |
1178 | if (!node->link_on) | |
1179 | break; | |
c9755e14 | 1180 | create: |
19a15b93 KH |
1181 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
1182 | if (device == NULL) | |
1183 | break; | |
1184 | ||
c781c06d KH |
1185 | /* |
1186 | * Do minimal intialization of the device here, the | |
62305823 SR |
1187 | * rest will happen in fw_device_init(). |
1188 | * | |
1189 | * Attention: A lot of things, even fw_device_get(), | |
1190 | * cannot be done before fw_device_init() finished! | |
1191 | * You can basically just check device->state and | |
1192 | * schedule work until then, but only while holding | |
1193 | * card->lock. | |
c781c06d | 1194 | */ |
641f8791 | 1195 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1196 | device->card = fw_card_get(card); |
19a15b93 KH |
1197 | device->node = fw_node_get(node); |
1198 | device->node_id = node->node_id; | |
1199 | device->generation = card->generation; | |
92368890 | 1200 | device->is_local = node == card->local_node; |
d67cfb96 | 1201 | mutex_init(&device->client_list_mutex); |
97bd9efa | 1202 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1203 | |
c781c06d KH |
1204 | /* |
1205 | * Set the node data to point back to this device so | |
19a15b93 | 1206 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1207 | * and generation for the device. |
1208 | */ | |
19a15b93 KH |
1209 | node->data = device; |
1210 | ||
c781c06d KH |
1211 | /* |
1212 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1213 | * especially if they are bus powered and go through |
1214 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1215 | * first config rom scan half a second after bus reset. |
1216 | */ | |
19a15b93 KH |
1217 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1218 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
1219 | break; | |
1220 | ||
c9755e14 SR |
1221 | case FW_NODE_INITIATED_RESET: |
1222 | device = node->data; | |
1223 | if (device == NULL) | |
1224 | goto create; | |
1225 | ||
1226 | device->node_id = node->node_id; | |
1227 | smp_wmb(); /* update node_id before generation */ | |
1228 | device->generation = card->generation; | |
1229 | if (atomic_cmpxchg(&device->state, | |
1230 | FW_DEVICE_RUNNING, | |
1231 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1232 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
1233 | schedule_delayed_work(&device->work, | |
92368890 | 1234 | device->is_local ? 0 : INITIAL_DELAY); |
c9755e14 SR |
1235 | } |
1236 | break; | |
1237 | ||
19a15b93 KH |
1238 | case FW_NODE_UPDATED: |
1239 | if (!node->link_on || node->data == NULL) | |
1240 | break; | |
1241 | ||
1242 | device = node->data; | |
1243 | device->node_id = node->node_id; | |
b5d2a5e0 | 1244 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1245 | device->generation = card->generation; |
5f480477 KH |
1246 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1247 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
1248 | schedule_delayed_work(&device->work, 0); | |
1249 | } | |
19a15b93 KH |
1250 | break; |
1251 | ||
1252 | case FW_NODE_DESTROYED: | |
1253 | case FW_NODE_LINK_OFF: | |
1254 | if (!node->data) | |
1255 | break; | |
1256 | ||
c781c06d KH |
1257 | /* |
1258 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1259 | * are two cases here: either the device is fully |
1260 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1261 | * process of reading its config rom | |
1262 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1263 | * initialized we can reuse device->work to schedule a | |
1264 | * full fw_device_shutdown(). If not, there's work | |
1265 | * scheduled to read it's config rom, and we just put | |
1266 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1267 | * to create the device. |
1268 | */ | |
19a15b93 | 1269 | device = node->data; |
641f8791 | 1270 | if (atomic_xchg(&device->state, |
3d36a0df | 1271 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1272 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
e747a5c0 SR |
1273 | schedule_delayed_work(&device->work, |
1274 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); | |
19a15b93 KH |
1275 | } |
1276 | break; | |
1277 | } | |
1278 | } |