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Commit | Line | Data |
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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 | ||
d54423c6 | 21 | #include <linux/bug.h> |
41f321c2 | 22 | #include <linux/ctype.h> |
19a15b93 | 23 | #include <linux/delay.h> |
41f321c2 SR |
24 | #include <linux/device.h> |
25 | #include <linux/errno.h> | |
77c9a5da SR |
26 | #include <linux/firewire.h> |
27 | #include <linux/firewire-constants.h> | |
a3aca3da | 28 | #include <linux/idr.h> |
3d36a0df | 29 | #include <linux/jiffies.h> |
41f321c2 SR |
30 | #include <linux/kobject.h> |
31 | #include <linux/list.h> | |
b3b29888 | 32 | #include <linux/mod_devicetable.h> |
e8ca9702 | 33 | #include <linux/module.h> |
d67cfb96 | 34 | #include <linux/mutex.h> |
6188e10d MW |
35 | #include <linux/rwsem.h> |
36 | #include <linux/semaphore.h> | |
cf417e54 | 37 | #include <linux/spinlock.h> |
41f321c2 SR |
38 | #include <linux/string.h> |
39 | #include <linux/workqueue.h> | |
40 | ||
e8ca9702 SR |
41 | #include <asm/atomic.h> |
42 | #include <asm/byteorder.h> | |
b5d2a5e0 | 43 | #include <asm/system.h> |
41f321c2 | 44 | |
77c9a5da | 45 | #include "core.h" |
19a15b93 | 46 | |
13b302d0 | 47 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p) |
19a15b93 KH |
48 | { |
49 | ci->p = p + 1; | |
50 | ci->end = ci->p + (p[0] >> 16); | |
51 | } | |
19a15b93 KH |
52 | EXPORT_SYMBOL(fw_csr_iterator_init); |
53 | ||
54 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
55 | { | |
56 | *key = *ci->p >> 24; | |
57 | *value = *ci->p & 0xffffff; | |
58 | ||
59 | return ci->p++ < ci->end; | |
60 | } | |
19a15b93 KH |
61 | EXPORT_SYMBOL(fw_csr_iterator_next); |
62 | ||
13b302d0 | 63 | static const u32 *search_leaf(const u32 *directory, int search_key) |
1f8fef7b CL |
64 | { |
65 | struct fw_csr_iterator ci; | |
66 | int last_key = 0, key, value; | |
67 | ||
68 | fw_csr_iterator_init(&ci, directory); | |
69 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
70 | if (last_key == search_key && | |
71 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
72 | return ci.p - 1 + value; | |
3c2c58cb | 73 | |
1f8fef7b CL |
74 | last_key = key; |
75 | } | |
3c2c58cb | 76 | |
1f8fef7b CL |
77 | return NULL; |
78 | } | |
79 | ||
13b302d0 | 80 | static int textual_leaf_to_string(const u32 *block, char *buf, size_t size) |
1f8fef7b | 81 | { |
3c2c58cb SR |
82 | unsigned int quadlets, i; |
83 | char c; | |
1f8fef7b CL |
84 | |
85 | if (!size || !buf) | |
86 | return -EINVAL; | |
87 | ||
3c2c58cb | 88 | quadlets = min(block[0] >> 16, 256U); |
1f8fef7b CL |
89 | if (quadlets < 2) |
90 | return -ENODATA; | |
91 | ||
92 | if (block[1] != 0 || block[2] != 0) | |
93 | /* unknown language/character set */ | |
94 | return -ENODATA; | |
95 | ||
96 | block += 3; | |
97 | quadlets -= 2; | |
3c2c58cb SR |
98 | for (i = 0; i < quadlets * 4 && i < size - 1; i++) { |
99 | c = block[i / 4] >> (24 - 8 * (i % 4)); | |
1f8fef7b CL |
100 | if (c == '\0') |
101 | break; | |
3c2c58cb | 102 | buf[i] = c; |
1f8fef7b | 103 | } |
3c2c58cb SR |
104 | buf[i] = '\0'; |
105 | ||
106 | return i; | |
1f8fef7b CL |
107 | } |
108 | ||
109 | /** | |
110 | * fw_csr_string - reads a string from the configuration ROM | |
3c2c58cb | 111 | * @directory: e.g. root directory or unit directory |
1f8fef7b CL |
112 | * @key: the key of the preceding directory entry |
113 | * @buf: where to put the string | |
114 | * @size: size of @buf, in bytes | |
115 | * | |
3c2c58cb SR |
116 | * The string is taken from a minimal ASCII text descriptor leaf after |
117 | * the immediate entry with @key. The string is zero-terminated. | |
118 | * Returns strlen(buf) or a negative error code. | |
1f8fef7b | 119 | */ |
13b302d0 | 120 | int fw_csr_string(const u32 *directory, int key, char *buf, size_t size) |
1f8fef7b | 121 | { |
13b302d0 | 122 | const u32 *leaf = search_leaf(directory, key); |
1f8fef7b CL |
123 | if (!leaf) |
124 | return -ENOENT; | |
3c2c58cb | 125 | |
1f8fef7b CL |
126 | return textual_leaf_to_string(leaf, buf, size); |
127 | } | |
128 | EXPORT_SYMBOL(fw_csr_string); | |
129 | ||
099d5414 | 130 | static bool is_fw_unit(struct device *dev); |
19a15b93 | 131 | |
13b302d0 | 132 | static int match_unit_directory(const u32 *directory, u32 match_flags, |
b3b29888 | 133 | const struct ieee1394_device_id *id) |
19a15b93 KH |
134 | { |
135 | struct fw_csr_iterator ci; | |
136 | int key, value, match; | |
137 | ||
138 | match = 0; | |
139 | fw_csr_iterator_init(&ci, directory); | |
140 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
b3b29888 SR |
141 | if (key == CSR_VENDOR && value == id->vendor_id) |
142 | match |= IEEE1394_MATCH_VENDOR_ID; | |
143 | if (key == CSR_MODEL && value == id->model_id) | |
144 | match |= IEEE1394_MATCH_MODEL_ID; | |
19a15b93 | 145 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) |
b3b29888 | 146 | match |= IEEE1394_MATCH_SPECIFIER_ID; |
19a15b93 | 147 | if (key == CSR_VERSION && value == id->version) |
b3b29888 | 148 | match |= IEEE1394_MATCH_VERSION; |
19a15b93 KH |
149 | } |
150 | ||
e41f8d70 | 151 | return (match & match_flags) == match_flags; |
19a15b93 KH |
152 | } |
153 | ||
154 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
155 | { | |
156 | struct fw_unit *unit = fw_unit(dev); | |
e41f8d70 SR |
157 | struct fw_device *device; |
158 | const struct ieee1394_device_id *id; | |
19a15b93 KH |
159 | |
160 | /* We only allow binding to fw_units. */ | |
161 | if (!is_fw_unit(dev)) | |
162 | return 0; | |
163 | ||
e5110d01 | 164 | device = fw_parent_device(unit); |
77c9a5da | 165 | id = container_of(drv, struct fw_driver, driver)->id_table; |
e41f8d70 | 166 | |
77c9a5da | 167 | for (; id->match_flags != 0; id++) { |
e41f8d70 SR |
168 | if (match_unit_directory(unit->directory, id->match_flags, id)) |
169 | return 1; | |
170 | ||
171 | /* Also check vendor ID in the root directory. */ | |
172 | if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) && | |
173 | match_unit_directory(&device->config_rom[5], | |
174 | IEEE1394_MATCH_VENDOR_ID, id) && | |
175 | match_unit_directory(unit->directory, id->match_flags | |
176 | & ~IEEE1394_MATCH_VENDOR_ID, id)) | |
19a15b93 KH |
177 | return 1; |
178 | } | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
184 | { | |
e5110d01 | 185 | struct fw_device *device = fw_parent_device(unit); |
19a15b93 KH |
186 | struct fw_csr_iterator ci; |
187 | ||
188 | int key, value; | |
189 | int vendor = 0; | |
190 | int model = 0; | |
191 | int specifier_id = 0; | |
192 | int version = 0; | |
193 | ||
194 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
195 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
196 | switch (key) { | |
197 | case CSR_VENDOR: | |
198 | vendor = value; | |
199 | break; | |
200 | case CSR_MODEL: | |
201 | model = value; | |
202 | break; | |
203 | } | |
204 | } | |
205 | ||
206 | fw_csr_iterator_init(&ci, unit->directory); | |
207 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
208 | switch (key) { | |
209 | case CSR_SPECIFIER_ID: | |
210 | specifier_id = value; | |
211 | break; | |
212 | case CSR_VERSION: | |
213 | version = value; | |
214 | break; | |
215 | } | |
216 | } | |
217 | ||
218 | return snprintf(buffer, buffer_size, | |
219 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
220 | vendor, model, specifier_id, version); | |
221 | } | |
222 | ||
53dca511 | 223 | static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
224 | { |
225 | struct fw_unit *unit = fw_unit(dev); | |
226 | char modalias[64]; | |
19a15b93 | 227 | |
2d826cc5 | 228 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 229 | |
7eff2e7a | 230 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
231 | return -ENOMEM; |
232 | ||
19a15b93 KH |
233 | return 0; |
234 | } | |
235 | ||
236 | struct bus_type fw_bus_type = { | |
362c2c8c | 237 | .name = "firewire", |
19a15b93 | 238 | .match = fw_unit_match, |
19a15b93 | 239 | }; |
19a15b93 KH |
240 | EXPORT_SYMBOL(fw_bus_type); |
241 | ||
19a15b93 KH |
242 | int fw_device_enable_phys_dma(struct fw_device *device) |
243 | { | |
b5d2a5e0 SR |
244 | int generation = device->generation; |
245 | ||
246 | /* device->node_id, accessed below, must not be older than generation */ | |
247 | smp_rmb(); | |
248 | ||
19a15b93 KH |
249 | return device->card->driver->enable_phys_dma(device->card, |
250 | device->node_id, | |
b5d2a5e0 | 251 | generation); |
19a15b93 | 252 | } |
19a15b93 KH |
253 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
254 | ||
7feb9cce KH |
255 | struct config_rom_attribute { |
256 | struct device_attribute attr; | |
257 | u32 key; | |
258 | }; | |
259 | ||
53dca511 SR |
260 | static ssize_t show_immediate(struct device *dev, |
261 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
262 | { |
263 | struct config_rom_attribute *attr = | |
264 | container_of(dattr, struct config_rom_attribute, attr); | |
265 | struct fw_csr_iterator ci; | |
13b302d0 | 266 | const u32 *dir; |
c9755e14 SR |
267 | int key, value, ret = -ENOENT; |
268 | ||
269 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
270 | |
271 | if (is_fw_unit(dev)) | |
272 | dir = fw_unit(dev)->directory; | |
273 | else | |
274 | dir = fw_device(dev)->config_rom + 5; | |
275 | ||
276 | fw_csr_iterator_init(&ci, dir); | |
277 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
278 | if (attr->key == key) { |
279 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
280 | "0x%06x\n", value); | |
281 | break; | |
282 | } | |
283 | ||
284 | up_read(&fw_device_rwsem); | |
7feb9cce | 285 | |
c9755e14 | 286 | return ret; |
7feb9cce KH |
287 | } |
288 | ||
289 | #define IMMEDIATE_ATTR(name, key) \ | |
290 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
291 | ||
53dca511 SR |
292 | static ssize_t show_text_leaf(struct device *dev, |
293 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
294 | { |
295 | struct config_rom_attribute *attr = | |
296 | container_of(dattr, struct config_rom_attribute, attr); | |
13b302d0 | 297 | const u32 *dir; |
1f8fef7b CL |
298 | size_t bufsize; |
299 | char dummy_buf[2]; | |
300 | int ret; | |
7feb9cce | 301 | |
c9755e14 SR |
302 | down_read(&fw_device_rwsem); |
303 | ||
7feb9cce KH |
304 | if (is_fw_unit(dev)) |
305 | dir = fw_unit(dev)->directory; | |
306 | else | |
307 | dir = fw_device(dev)->config_rom + 5; | |
308 | ||
1f8fef7b CL |
309 | if (buf) { |
310 | bufsize = PAGE_SIZE - 1; | |
311 | } else { | |
312 | buf = dummy_buf; | |
313 | bufsize = 1; | |
7feb9cce KH |
314 | } |
315 | ||
1f8fef7b | 316 | ret = fw_csr_string(dir, attr->key, buf, bufsize); |
7feb9cce | 317 | |
1f8fef7b CL |
318 | if (ret >= 0) { |
319 | /* Strip trailing whitespace and add newline. */ | |
320 | while (ret > 0 && isspace(buf[ret - 1])) | |
321 | ret--; | |
322 | strcpy(buf + ret, "\n"); | |
323 | ret++; | |
c9755e14 | 324 | } |
7feb9cce | 325 | |
c9755e14 | 326 | up_read(&fw_device_rwsem); |
7feb9cce | 327 | |
c9755e14 | 328 | return ret; |
7feb9cce KH |
329 | } |
330 | ||
331 | #define TEXT_LEAF_ATTR(name, key) \ | |
332 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
333 | ||
334 | static struct config_rom_attribute config_rom_attributes[] = { | |
335 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
336 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
337 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
338 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
339 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
340 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
341 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
342 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
343 | }; | |
344 | ||
53dca511 SR |
345 | static void init_fw_attribute_group(struct device *dev, |
346 | struct device_attribute *attrs, | |
347 | struct fw_attribute_group *group) | |
7feb9cce KH |
348 | { |
349 | struct device_attribute *attr; | |
6f2e53d5 KH |
350 | int i, j; |
351 | ||
352 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
353 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
354 | |
355 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
356 | attr = &config_rom_attributes[i].attr; | |
357 | if (attr->show(dev, attr, NULL) < 0) | |
358 | continue; | |
6f2e53d5 | 359 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
360 | } |
361 | ||
e5333db9 | 362 | group->attrs[j] = NULL; |
6f2e53d5 KH |
363 | group->groups[0] = &group->group; |
364 | group->groups[1] = NULL; | |
365 | group->group.attrs = group->attrs; | |
a4dbd674 | 366 | dev->groups = (const struct attribute_group **) group->groups; |
7feb9cce KH |
367 | } |
368 | ||
53dca511 SR |
369 | static ssize_t modalias_show(struct device *dev, |
370 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
371 | { |
372 | struct fw_unit *unit = fw_unit(dev); | |
373 | int length; | |
374 | ||
375 | length = get_modalias(unit, buf, PAGE_SIZE); | |
376 | strcpy(buf + length, "\n"); | |
377 | ||
378 | return length + 1; | |
379 | } | |
380 | ||
53dca511 SR |
381 | static ssize_t rom_index_show(struct device *dev, |
382 | struct device_attribute *attr, char *buf) | |
19a15b93 | 383 | { |
21351dbe KH |
384 | struct fw_device *device = fw_device(dev->parent); |
385 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 386 | |
21351dbe KH |
387 | return snprintf(buf, PAGE_SIZE, "%d\n", |
388 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
389 | } |
390 | ||
21351dbe KH |
391 | static struct device_attribute fw_unit_attributes[] = { |
392 | __ATTR_RO(modalias), | |
393 | __ATTR_RO(rom_index), | |
394 | __ATTR_NULL, | |
19a15b93 KH |
395 | }; |
396 | ||
53dca511 SR |
397 | static ssize_t config_rom_show(struct device *dev, |
398 | struct device_attribute *attr, char *buf) | |
048961ef | 399 | { |
21351dbe | 400 | struct fw_device *device = fw_device(dev); |
c9755e14 | 401 | size_t length; |
048961ef | 402 | |
c9755e14 SR |
403 | down_read(&fw_device_rwsem); |
404 | length = device->config_rom_length * 4; | |
405 | memcpy(buf, device->config_rom, length); | |
406 | up_read(&fw_device_rwsem); | |
21351dbe | 407 | |
c9755e14 | 408 | return length; |
048961ef KH |
409 | } |
410 | ||
53dca511 SR |
411 | static ssize_t guid_show(struct device *dev, |
412 | struct device_attribute *attr, char *buf) | |
bbd14945 KH |
413 | { |
414 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
415 | int ret; |
416 | ||
417 | down_read(&fw_device_rwsem); | |
418 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
419 | device->config_rom[3], device->config_rom[4]); | |
420 | up_read(&fw_device_rwsem); | |
bbd14945 | 421 | |
c9755e14 | 422 | return ret; |
bbd14945 KH |
423 | } |
424 | ||
13b302d0 | 425 | static int units_sprintf(char *buf, const u32 *directory) |
0210b66d SR |
426 | { |
427 | struct fw_csr_iterator ci; | |
428 | int key, value; | |
429 | int specifier_id = 0; | |
430 | int version = 0; | |
431 | ||
432 | fw_csr_iterator_init(&ci, directory); | |
433 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
434 | switch (key) { | |
435 | case CSR_SPECIFIER_ID: | |
436 | specifier_id = value; | |
437 | break; | |
438 | case CSR_VERSION: | |
439 | version = value; | |
440 | break; | |
441 | } | |
442 | } | |
443 | ||
444 | return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version); | |
445 | } | |
446 | ||
447 | static ssize_t units_show(struct device *dev, | |
448 | struct device_attribute *attr, char *buf) | |
449 | { | |
450 | struct fw_device *device = fw_device(dev); | |
451 | struct fw_csr_iterator ci; | |
452 | int key, value, i = 0; | |
453 | ||
454 | down_read(&fw_device_rwsem); | |
455 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
456 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
457 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
458 | continue; | |
459 | i += units_sprintf(&buf[i], ci.p + value - 1); | |
460 | if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) | |
461 | break; | |
462 | } | |
463 | up_read(&fw_device_rwsem); | |
464 | ||
465 | if (i) | |
466 | buf[i - 1] = '\n'; | |
467 | ||
468 | return i; | |
469 | } | |
470 | ||
21351dbe KH |
471 | static struct device_attribute fw_device_attributes[] = { |
472 | __ATTR_RO(config_rom), | |
bbd14945 | 473 | __ATTR_RO(guid), |
0210b66d | 474 | __ATTR_RO(units), |
21351dbe | 475 | __ATTR_NULL, |
048961ef KH |
476 | }; |
477 | ||
53dca511 SR |
478 | static int read_rom(struct fw_device *device, |
479 | int generation, int index, u32 *data) | |
19a15b93 | 480 | { |
1e119fa9 | 481 | int rcode; |
b5d2a5e0 SR |
482 | |
483 | /* device->node_id, accessed below, must not be older than generation */ | |
484 | smp_rmb(); | |
19a15b93 | 485 | |
1e119fa9 | 486 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 487 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
488 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
489 | data, 4); | |
490 | be32_to_cpus(data); | |
19a15b93 | 491 | |
1e119fa9 | 492 | return rcode; |
19a15b93 KH |
493 | } |
494 | ||
fd6e0c51 | 495 | #define MAX_CONFIG_ROM_SIZE 256 |
1dadff71 | 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 | |
fd6e0c51 | 500 | * generation changes under us, read_config_rom will fail and get retried. |
f8d2dc39 SR |
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 | */ | |
fd6e0c51 | 504 | static int read_config_rom(struct fw_device *device, int generation) |
19a15b93 | 505 | { |
13b302d0 SR |
506 | const u32 *old_rom, *new_rom; |
507 | u32 *rom, *stack; | |
1dadff71 SR |
508 | u32 sp, key; |
509 | int i, end, length, ret = -1; | |
510 | ||
fd6e0c51 SR |
511 | rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE + |
512 | sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL); | |
1dadff71 SR |
513 | if (rom == NULL) |
514 | return -ENOMEM; | |
515 | ||
fd6e0c51 SR |
516 | stack = &rom[MAX_CONFIG_ROM_SIZE]; |
517 | memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE); | |
19a15b93 | 518 | |
f1397490 SR |
519 | device->max_speed = SCODE_100; |
520 | ||
19a15b93 KH |
521 | /* First read the bus info block. */ |
522 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 523 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 524 | goto out; |
c781c06d KH |
525 | /* |
526 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
527 | * reply with a 0 for the first quadlet of the config |
528 | * rom to indicate that they are booting (for example, | |
529 | * if the firmware is on the disk of a external | |
530 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
531 | * retry mechanism will try again later. |
532 | */ | |
19a15b93 | 533 | if (i == 0 && rom[i] == 0) |
1dadff71 | 534 | goto out; |
19a15b93 KH |
535 | } |
536 | ||
f1397490 SR |
537 | device->max_speed = device->node->max_speed; |
538 | ||
539 | /* | |
540 | * Determine the speed of | |
541 | * - devices with link speed less than PHY speed, | |
542 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
543 | * - all devices if there are 1394b repeaters. | |
544 | * Note, we cannot use the bus info block's link_spd as starting point | |
545 | * because some buggy firmwares set it lower than necessary and because | |
546 | * 1394-1995 nodes do not have the field. | |
547 | */ | |
548 | if ((rom[2] & 0x7) < device->max_speed || | |
549 | device->max_speed == SCODE_BETA || | |
550 | device->card->beta_repeaters_present) { | |
551 | u32 dummy; | |
552 | ||
553 | /* for S1600 and S3200 */ | |
554 | if (device->max_speed == SCODE_BETA) | |
555 | device->max_speed = device->card->link_speed; | |
556 | ||
557 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
558 | if (read_rom(device, generation, 0, &dummy) == |
559 | RCODE_COMPLETE) | |
f1397490 SR |
560 | break; |
561 | device->max_speed--; | |
562 | } | |
563 | } | |
564 | ||
c781c06d KH |
565 | /* |
566 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
567 | * directory structure so we parse it using a stack of |
568 | * references to the blocks that make up the structure. We | |
569 | * push a reference to the root directory on the stack to | |
c781c06d KH |
570 | * start things off. |
571 | */ | |
19a15b93 KH |
572 | length = i; |
573 | sp = 0; | |
574 | stack[sp++] = 0xc0000005; | |
575 | while (sp > 0) { | |
c781c06d KH |
576 | /* |
577 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
578 | * lower 24 bits is the offset into the config rom, |
579 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
580 | * block. |
581 | */ | |
19a15b93 KH |
582 | key = stack[--sp]; |
583 | i = key & 0xffffff; | |
fd6e0c51 | 584 | if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) |
1dadff71 | 585 | goto out; |
19a15b93 KH |
586 | |
587 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 588 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 589 | goto out; |
19a15b93 | 590 | end = i + (rom[i] >> 16) + 1; |
fd6e0c51 | 591 | if (end > MAX_CONFIG_ROM_SIZE) { |
c781c06d | 592 | /* |
2799d5c5 SR |
593 | * This block extends outside the config ROM which is |
594 | * a firmware bug. Ignore this whole block, i.e. | |
595 | * simply set a fake block length of 0. | |
c781c06d | 596 | */ |
2799d5c5 SR |
597 | fw_error("skipped invalid ROM block %x at %llx\n", |
598 | rom[i], | |
599 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); | |
600 | rom[i] = 0; | |
601 | end = i; | |
602 | } | |
603 | i++; | |
19a15b93 | 604 | |
c781c06d KH |
605 | /* |
606 | * Now read in the block. If this is a directory | |
19a15b93 | 607 | * block, check the entries as we read them to see if |
c781c06d KH |
608 | * it references another block, and push it in that case. |
609 | */ | |
d54423c6 | 610 | for (; i < end; i++) { |
f8d2dc39 SR |
611 | if (read_rom(device, generation, i, &rom[i]) != |
612 | RCODE_COMPLETE) | |
1dadff71 | 613 | goto out; |
d54423c6 | 614 | |
58aaa542 | 615 | if ((key >> 30) != 3 || (rom[i] >> 30) < 2) |
d54423c6 SR |
616 | continue; |
617 | /* | |
618 | * Offset points outside the ROM. May be a firmware | |
619 | * bug or an Extended ROM entry (IEEE 1212-2001 clause | |
620 | * 7.7.18). Simply overwrite this pointer here by a | |
621 | * fake immediate entry so that later iterators over | |
622 | * the ROM don't have to check offsets all the time. | |
623 | */ | |
fd6e0c51 | 624 | if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) { |
d54423c6 SR |
625 | fw_error("skipped unsupported ROM entry %x at %llx\n", |
626 | rom[i], | |
627 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); | |
628 | rom[i] = 0; | |
629 | continue; | |
630 | } | |
631 | stack[sp++] = i + rom[i]; | |
19a15b93 KH |
632 | } |
633 | if (length < i) | |
634 | length = i; | |
635 | } | |
636 | ||
c9755e14 SR |
637 | old_rom = device->config_rom; |
638 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
639 | if (new_rom == NULL) | |
1dadff71 | 640 | goto out; |
c9755e14 SR |
641 | |
642 | down_write(&fw_device_rwsem); | |
643 | device->config_rom = new_rom; | |
19a15b93 | 644 | device->config_rom_length = length; |
c9755e14 SR |
645 | up_write(&fw_device_rwsem); |
646 | ||
647 | kfree(old_rom); | |
1dadff71 | 648 | ret = 0; |
837ec787 SR |
649 | device->max_rec = rom[2] >> 12 & 0xf; |
650 | device->cmc = rom[2] >> 30 & 1; | |
651 | device->irmc = rom[2] >> 31 & 1; | |
1dadff71 SR |
652 | out: |
653 | kfree(rom); | |
19a15b93 | 654 | |
1dadff71 | 655 | return ret; |
19a15b93 KH |
656 | } |
657 | ||
658 | static void fw_unit_release(struct device *dev) | |
659 | { | |
660 | struct fw_unit *unit = fw_unit(dev); | |
661 | ||
662 | kfree(unit); | |
663 | } | |
664 | ||
21351dbe | 665 | static struct device_type fw_unit_type = { |
21351dbe KH |
666 | .uevent = fw_unit_uevent, |
667 | .release = fw_unit_release, | |
668 | }; | |
669 | ||
099d5414 | 670 | static bool is_fw_unit(struct device *dev) |
19a15b93 | 671 | { |
21351dbe | 672 | return dev->type == &fw_unit_type; |
19a15b93 KH |
673 | } |
674 | ||
675 | static void create_units(struct fw_device *device) | |
676 | { | |
677 | struct fw_csr_iterator ci; | |
678 | struct fw_unit *unit; | |
679 | int key, value, i; | |
680 | ||
681 | i = 0; | |
682 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
683 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
684 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
685 | continue; | |
686 | ||
c781c06d KH |
687 | /* |
688 | * Get the address of the unit directory and try to | |
689 | * match the drivers id_tables against it. | |
690 | */ | |
2d826cc5 | 691 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
692 | if (unit == NULL) { |
693 | fw_error("failed to allocate memory for unit\n"); | |
694 | continue; | |
695 | } | |
696 | ||
697 | unit->directory = ci.p + value - 1; | |
698 | unit->device.bus = &fw_bus_type; | |
21351dbe | 699 | unit->device.type = &fw_unit_type; |
19a15b93 | 700 | unit->device.parent = &device->device; |
a1f64819 | 701 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 702 | |
e5333db9 SR |
703 | BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) < |
704 | ARRAY_SIZE(fw_unit_attributes) + | |
705 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
706 | init_fw_attribute_group(&unit->device, |
707 | fw_unit_attributes, | |
708 | &unit->attribute_group); | |
e5333db9 | 709 | |
7feb9cce KH |
710 | if (device_register(&unit->device) < 0) |
711 | goto skip_unit; | |
712 | ||
7feb9cce KH |
713 | continue; |
714 | ||
7feb9cce KH |
715 | skip_unit: |
716 | kfree(unit); | |
19a15b93 KH |
717 | } |
718 | } | |
719 | ||
720 | static int shutdown_unit(struct device *device, void *data) | |
721 | { | |
21351dbe | 722 | device_unregister(device); |
19a15b93 KH |
723 | |
724 | return 0; | |
725 | } | |
726 | ||
c9755e14 SR |
727 | /* |
728 | * fw_device_rwsem acts as dual purpose mutex: | |
729 | * - serializes accesses to fw_device_idr, | |
730 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
731 | * fw_unit.directory, unless those accesses happen at safe occasions | |
732 | */ | |
733 | DECLARE_RWSEM(fw_device_rwsem); | |
734 | ||
d6053e08 | 735 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
736 | int fw_cdev_major; |
737 | ||
96b19062 | 738 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
739 | { |
740 | struct fw_device *device; | |
741 | ||
c9755e14 | 742 | down_read(&fw_device_rwsem); |
a3aca3da | 743 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
744 | if (device) |
745 | fw_device_get(device); | |
c9755e14 | 746 | up_read(&fw_device_rwsem); |
a3aca3da KH |
747 | |
748 | return device; | |
749 | } | |
750 | ||
3d36a0df SR |
751 | /* |
752 | * These defines control the retry behavior for reading the config | |
753 | * rom. It shouldn't be necessary to tweak these; if the device | |
754 | * doesn't respond to a config rom read within 10 seconds, it's not | |
755 | * going to respond at all. As for the initial delay, a lot of | |
756 | * devices will be able to respond within half a second after bus | |
757 | * reset. On the other hand, it's not really worth being more | |
758 | * aggressive than that, since it scales pretty well; if 10 devices | |
759 | * are plugged in, they're all getting read within one second. | |
760 | */ | |
761 | ||
762 | #define MAX_RETRIES 10 | |
763 | #define RETRY_DELAY (3 * HZ) | |
764 | #define INITIAL_DELAY (HZ / 2) | |
765 | #define SHUTDOWN_DELAY (2 * HZ) | |
766 | ||
19a15b93 KH |
767 | static void fw_device_shutdown(struct work_struct *work) |
768 | { | |
769 | struct fw_device *device = | |
770 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
771 | int minor = MINOR(device->device.devt); |
772 | ||
e747a5c0 SR |
773 | if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) |
774 | && !list_empty(&device->card->link)) { | |
3d36a0df SR |
775 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); |
776 | return; | |
777 | } | |
778 | ||
779 | if (atomic_cmpxchg(&device->state, | |
780 | FW_DEVICE_GONE, | |
781 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
782 | return; | |
783 | ||
2603bf21 | 784 | fw_device_cdev_remove(device); |
19a15b93 KH |
785 | device_for_each_child(&device->device, NULL, shutdown_unit); |
786 | device_unregister(&device->device); | |
96b19062 | 787 | |
c9755e14 | 788 | down_write(&fw_device_rwsem); |
96b19062 | 789 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 790 | up_write(&fw_device_rwsem); |
3d36a0df | 791 | |
96b19062 | 792 | fw_device_put(device); |
19a15b93 KH |
793 | } |
794 | ||
aed80892 SR |
795 | static void fw_device_release(struct device *dev) |
796 | { | |
797 | struct fw_device *device = fw_device(dev); | |
798 | struct fw_card *card = device->card; | |
799 | unsigned long flags; | |
800 | ||
801 | /* | |
802 | * Take the card lock so we don't set this to NULL while a | |
803 | * FW_NODE_UPDATED callback is being handled or while the | |
804 | * bus manager work looks at this node. | |
805 | */ | |
806 | spin_lock_irqsave(&card->lock, flags); | |
807 | device->node->data = NULL; | |
808 | spin_unlock_irqrestore(&card->lock, flags); | |
809 | ||
810 | fw_node_put(device->node); | |
811 | kfree(device->config_rom); | |
812 | kfree(device); | |
813 | fw_card_put(card); | |
814 | } | |
815 | ||
21351dbe | 816 | static struct device_type fw_device_type = { |
aed80892 | 817 | .release = fw_device_release, |
21351dbe KH |
818 | }; |
819 | ||
099d5414 SR |
820 | static bool is_fw_device(struct device *dev) |
821 | { | |
822 | return dev->type == &fw_device_type; | |
823 | } | |
824 | ||
aed80892 SR |
825 | static int update_unit(struct device *dev, void *data) |
826 | { | |
827 | struct fw_unit *unit = fw_unit(dev); | |
828 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
829 | ||
830 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { | |
831 | down(&dev->sem); | |
832 | driver->update(unit); | |
833 | up(&dev->sem); | |
834 | } | |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
839 | static void fw_device_update(struct work_struct *work) | |
840 | { | |
841 | struct fw_device *device = | |
842 | container_of(work, struct fw_device, work.work); | |
843 | ||
844 | fw_device_cdev_update(device); | |
845 | device_for_each_child(&device->device, NULL, update_unit); | |
846 | } | |
3d36a0df | 847 | |
c781c06d | 848 | /* |
3d36a0df SR |
849 | * If a device was pending for deletion because its node went away but its |
850 | * bus info block and root directory header matches that of a newly discovered | |
851 | * device, revive the existing fw_device. | |
852 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 853 | */ |
3d36a0df SR |
854 | static int lookup_existing_device(struct device *dev, void *data) |
855 | { | |
856 | struct fw_device *old = fw_device(dev); | |
857 | struct fw_device *new = data; | |
858 | struct fw_card *card = new->card; | |
859 | int match = 0; | |
860 | ||
099d5414 SR |
861 | if (!is_fw_device(dev)) |
862 | return 0; | |
863 | ||
3d36a0df SR |
864 | down_read(&fw_device_rwsem); /* serialize config_rom access */ |
865 | spin_lock_irq(&card->lock); /* serialize node access */ | |
866 | ||
867 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
868 | atomic_cmpxchg(&old->state, | |
869 | FW_DEVICE_GONE, | |
870 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
871 | struct fw_node *current_node = new->node; | |
872 | struct fw_node *obsolete_node = old->node; | |
873 | ||
874 | new->node = obsolete_node; | |
875 | new->node->data = new; | |
876 | old->node = current_node; | |
877 | old->node->data = old; | |
878 | ||
879 | old->max_speed = new->max_speed; | |
880 | old->node_id = current_node->node_id; | |
881 | smp_wmb(); /* update node_id before generation */ | |
882 | old->generation = card->generation; | |
883 | old->config_rom_retries = 0; | |
884 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 885 | |
3d36a0df SR |
886 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
887 | schedule_delayed_work(&old->work, 0); | |
888 | ||
889 | if (current_node == card->root_node) | |
890 | fw_schedule_bm_work(card, 0); | |
891 | ||
892 | match = 1; | |
893 | } | |
894 | ||
895 | spin_unlock_irq(&card->lock); | |
896 | up_read(&fw_device_rwsem); | |
897 | ||
898 | return match; | |
899 | } | |
19a15b93 | 900 | |
7889b60e SR |
901 | enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; |
902 | ||
099d5414 | 903 | static void set_broadcast_channel(struct fw_device *device, int generation) |
7889b60e SR |
904 | { |
905 | struct fw_card *card = device->card; | |
906 | __be32 data; | |
907 | int rcode; | |
908 | ||
909 | if (!card->broadcast_channel_allocated) | |
910 | return; | |
911 | ||
837ec787 SR |
912 | /* |
913 | * The Broadcast_Channel Valid bit is required by nodes which want to | |
914 | * transmit on this channel. Such transmissions are practically | |
915 | * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required | |
916 | * to be IRM capable and have a max_rec of 8 or more. We use this fact | |
917 | * to narrow down to which nodes we send Broadcast_Channel updates. | |
918 | */ | |
919 | if (!device->irmc || device->max_rec < 8) | |
920 | return; | |
921 | ||
922 | /* | |
923 | * Some 1394-1995 nodes crash if this 1394a-2000 register is written. | |
924 | * Perform a read test first. | |
925 | */ | |
7889b60e SR |
926 | if (device->bc_implemented == BC_UNKNOWN) { |
927 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, | |
928 | device->node_id, generation, device->max_speed, | |
929 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
930 | &data, 4); | |
931 | switch (rcode) { | |
932 | case RCODE_COMPLETE: | |
933 | if (data & cpu_to_be32(1 << 31)) { | |
934 | device->bc_implemented = BC_IMPLEMENTED; | |
935 | break; | |
936 | } | |
937 | /* else fall through to case address error */ | |
938 | case RCODE_ADDRESS_ERROR: | |
939 | device->bc_implemented = BC_UNIMPLEMENTED; | |
940 | } | |
941 | } | |
942 | ||
943 | if (device->bc_implemented == BC_IMPLEMENTED) { | |
944 | data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | | |
945 | BROADCAST_CHANNEL_VALID); | |
946 | fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, | |
947 | device->node_id, generation, device->max_speed, | |
948 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
949 | &data, 4); | |
950 | } | |
951 | } | |
952 | ||
099d5414 SR |
953 | int fw_device_set_broadcast_channel(struct device *dev, void *gen) |
954 | { | |
955 | if (is_fw_device(dev)) | |
956 | set_broadcast_channel(fw_device(dev), (long)gen); | |
957 | ||
958 | return 0; | |
959 | } | |
960 | ||
19a15b93 KH |
961 | static void fw_device_init(struct work_struct *work) |
962 | { | |
19a15b93 KH |
963 | struct fw_device *device = |
964 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 965 | struct device *revived_dev; |
e1eff7a3 | 966 | int minor, ret; |
19a15b93 | 967 | |
c781c06d KH |
968 | /* |
969 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 970 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
971 | * device. |
972 | */ | |
19a15b93 | 973 | |
fd6e0c51 | 974 | if (read_config_rom(device, device->generation) < 0) { |
855c603d SR |
975 | if (device->config_rom_retries < MAX_RETRIES && |
976 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
977 | device->config_rom_retries++; |
978 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
979 | } else { | |
907293d7 | 980 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 981 | device->node_id); |
931c4834 | 982 | if (device->node == device->card->root_node) |
0fa1986f | 983 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
984 | fw_device_release(&device->device); |
985 | } | |
986 | return; | |
987 | } | |
988 | ||
3d36a0df SR |
989 | revived_dev = device_find_child(device->card->device, |
990 | device, lookup_existing_device); | |
991 | if (revived_dev) { | |
992 | put_device(revived_dev); | |
993 | fw_device_release(&device->device); | |
994 | ||
995 | return; | |
996 | } | |
997 | ||
62305823 | 998 | device_initialize(&device->device); |
96b19062 SR |
999 | |
1000 | fw_device_get(device); | |
c9755e14 | 1001 | down_write(&fw_device_rwsem); |
e1eff7a3 | 1002 | ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
62305823 SR |
1003 | idr_get_new(&fw_device_idr, device, &minor) : |
1004 | -ENOMEM; | |
c9755e14 | 1005 | up_write(&fw_device_rwsem); |
96b19062 | 1006 | |
e1eff7a3 | 1007 | if (ret < 0) |
a3aca3da KH |
1008 | goto error; |
1009 | ||
19a15b93 | 1010 | device->device.bus = &fw_bus_type; |
21351dbe | 1011 | device->device.type = &fw_device_type; |
19a15b93 | 1012 | device->device.parent = device->card->device; |
a3aca3da | 1013 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 1014 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 1015 | |
e5333db9 SR |
1016 | BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) < |
1017 | ARRAY_SIZE(fw_device_attributes) + | |
1018 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
1019 | init_fw_attribute_group(&device->device, |
1020 | fw_device_attributes, | |
1021 | &device->attribute_group); | |
e5333db9 | 1022 | |
19a15b93 KH |
1023 | if (device_add(&device->device)) { |
1024 | fw_error("Failed to add device.\n"); | |
a3aca3da | 1025 | goto error_with_cdev; |
19a15b93 KH |
1026 | } |
1027 | ||
19a15b93 KH |
1028 | create_units(device); |
1029 | ||
c781c06d KH |
1030 | /* |
1031 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
1032 | * out from under us while we did the intialization work, we |
1033 | * have to shut down the device again here. Normally, though, | |
1034 | * fw_node_event will be responsible for shutting it down when | |
1035 | * necessary. We have to use the atomic cmpxchg here to avoid | |
1036 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
1037 | * fw_node_event(). |
1038 | */ | |
641f8791 | 1039 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1040 | FW_DEVICE_INITIALIZING, |
1041 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
1042 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
1043 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
fa6e697b SR |
1044 | } else { |
1045 | if (device->config_rom_retries) | |
1046 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
1047 | "%d config ROM retries\n", | |
a1f64819 | 1048 | dev_name(&device->device), |
fa6e697b SR |
1049 | device->config_rom[3], device->config_rom[4], |
1050 | 1 << device->max_speed, | |
1051 | device->config_rom_retries); | |
1052 | else | |
1053 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 1054 | dev_name(&device->device), |
fa6e697b SR |
1055 | device->config_rom[3], device->config_rom[4], |
1056 | 1 << device->max_speed); | |
c9755e14 | 1057 | device->config_rom_retries = 0; |
7889b60e | 1058 | |
099d5414 | 1059 | set_broadcast_channel(device, device->generation); |
fa6e697b | 1060 | } |
19a15b93 | 1061 | |
c781c06d KH |
1062 | /* |
1063 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
1064 | * root node config rom. If this races with a bus reset we |
1065 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
1066 | * pretty harmless. |
1067 | */ | |
19a15b93 | 1068 | if (device->node == device->card->root_node) |
0fa1986f | 1069 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
1070 | |
1071 | return; | |
1072 | ||
a3aca3da | 1073 | error_with_cdev: |
c9755e14 | 1074 | down_write(&fw_device_rwsem); |
a3aca3da | 1075 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 1076 | up_write(&fw_device_rwsem); |
373b2edd | 1077 | error: |
96b19062 SR |
1078 | fw_device_put(device); /* fw_device_idr's reference */ |
1079 | ||
1080 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
1081 | } |
1082 | ||
c9755e14 SR |
1083 | enum { |
1084 | REREAD_BIB_ERROR, | |
1085 | REREAD_BIB_GONE, | |
1086 | REREAD_BIB_UNCHANGED, | |
1087 | REREAD_BIB_CHANGED, | |
1088 | }; | |
1089 | ||
1090 | /* Reread and compare bus info block and header of root directory */ | |
fd6e0c51 | 1091 | static int reread_config_rom(struct fw_device *device, int generation) |
c9755e14 SR |
1092 | { |
1093 | u32 q; | |
1094 | int i; | |
1095 | ||
1096 | for (i = 0; i < 6; i++) { | |
1097 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
1098 | return REREAD_BIB_ERROR; | |
1099 | ||
1100 | if (i == 0 && q == 0) | |
1101 | return REREAD_BIB_GONE; | |
1102 | ||
d01b0178 | 1103 | if (q != device->config_rom[i]) |
c9755e14 SR |
1104 | return REREAD_BIB_CHANGED; |
1105 | } | |
1106 | ||
1107 | return REREAD_BIB_UNCHANGED; | |
1108 | } | |
1109 | ||
1110 | static void fw_device_refresh(struct work_struct *work) | |
1111 | { | |
1112 | struct fw_device *device = | |
1113 | container_of(work, struct fw_device, work.work); | |
1114 | struct fw_card *card = device->card; | |
1115 | int node_id = device->node_id; | |
1116 | ||
fd6e0c51 | 1117 | switch (reread_config_rom(device, device->generation)) { |
c9755e14 SR |
1118 | case REREAD_BIB_ERROR: |
1119 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
1120 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1121 | device->config_rom_retries++; | |
1122 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
1123 | ||
1124 | return; | |
1125 | } | |
1126 | goto give_up; | |
1127 | ||
1128 | case REREAD_BIB_GONE: | |
1129 | goto gone; | |
1130 | ||
1131 | case REREAD_BIB_UNCHANGED: | |
1132 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
1133 | FW_DEVICE_INITIALIZING, |
1134 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1135 | goto gone; |
1136 | ||
1137 | fw_device_update(work); | |
1138 | device->config_rom_retries = 0; | |
1139 | goto out; | |
1140 | ||
1141 | case REREAD_BIB_CHANGED: | |
1142 | break; | |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * Something changed. We keep things simple and don't investigate | |
1147 | * further. We just destroy all previous units and create new ones. | |
1148 | */ | |
1149 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
1150 | ||
fd6e0c51 | 1151 | if (read_config_rom(device, device->generation) < 0) { |
c9755e14 SR |
1152 | if (device->config_rom_retries < MAX_RETRIES && |
1153 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1154 | device->config_rom_retries++; | |
1155 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
1156 | ||
1157 | return; | |
1158 | } | |
1159 | goto give_up; | |
1160 | } | |
1161 | ||
1162 | create_units(device); | |
1163 | ||
0210b66d SR |
1164 | /* Userspace may want to re-read attributes. */ |
1165 | kobject_uevent(&device->device.kobj, KOBJ_CHANGE); | |
1166 | ||
c9755e14 | 1167 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1168 | FW_DEVICE_INITIALIZING, |
1169 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1170 | goto gone; |
1171 | ||
a1f64819 | 1172 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
1173 | device->config_rom_retries = 0; |
1174 | goto out; | |
1175 | ||
1176 | give_up: | |
a1f64819 | 1177 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 1178 | gone: |
3d36a0df SR |
1179 | atomic_set(&device->state, FW_DEVICE_GONE); |
1180 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
1181 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
c9755e14 SR |
1182 | out: |
1183 | if (node_id == card->root_node->node_id) | |
0fa1986f | 1184 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
1185 | } |
1186 | ||
19a15b93 KH |
1187 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
1188 | { | |
1189 | struct fw_device *device; | |
1190 | ||
19a15b93 KH |
1191 | switch (event) { |
1192 | case FW_NODE_CREATED: | |
1193 | case FW_NODE_LINK_ON: | |
1194 | if (!node->link_on) | |
1195 | break; | |
c9755e14 | 1196 | create: |
19a15b93 KH |
1197 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
1198 | if (device == NULL) | |
1199 | break; | |
1200 | ||
c781c06d KH |
1201 | /* |
1202 | * Do minimal intialization of the device here, the | |
62305823 SR |
1203 | * rest will happen in fw_device_init(). |
1204 | * | |
1205 | * Attention: A lot of things, even fw_device_get(), | |
1206 | * cannot be done before fw_device_init() finished! | |
1207 | * You can basically just check device->state and | |
1208 | * schedule work until then, but only while holding | |
1209 | * card->lock. | |
c781c06d | 1210 | */ |
641f8791 | 1211 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1212 | device->card = fw_card_get(card); |
19a15b93 KH |
1213 | device->node = fw_node_get(node); |
1214 | device->node_id = node->node_id; | |
1215 | device->generation = card->generation; | |
92368890 | 1216 | device->is_local = node == card->local_node; |
d67cfb96 | 1217 | mutex_init(&device->client_list_mutex); |
97bd9efa | 1218 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1219 | |
c781c06d KH |
1220 | /* |
1221 | * Set the node data to point back to this device so | |
19a15b93 | 1222 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1223 | * and generation for the device. |
1224 | */ | |
19a15b93 KH |
1225 | node->data = device; |
1226 | ||
c781c06d KH |
1227 | /* |
1228 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1229 | * especially if they are bus powered and go through |
1230 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1231 | * first config rom scan half a second after bus reset. |
1232 | */ | |
19a15b93 KH |
1233 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1234 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
1235 | break; | |
1236 | ||
c9755e14 SR |
1237 | case FW_NODE_INITIATED_RESET: |
1238 | device = node->data; | |
1239 | if (device == NULL) | |
1240 | goto create; | |
1241 | ||
1242 | device->node_id = node->node_id; | |
1243 | smp_wmb(); /* update node_id before generation */ | |
1244 | device->generation = card->generation; | |
1245 | if (atomic_cmpxchg(&device->state, | |
1246 | FW_DEVICE_RUNNING, | |
1247 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1248 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
1249 | schedule_delayed_work(&device->work, | |
92368890 | 1250 | device->is_local ? 0 : INITIAL_DELAY); |
c9755e14 SR |
1251 | } |
1252 | break; | |
1253 | ||
19a15b93 KH |
1254 | case FW_NODE_UPDATED: |
1255 | if (!node->link_on || node->data == NULL) | |
1256 | break; | |
1257 | ||
1258 | device = node->data; | |
1259 | device->node_id = node->node_id; | |
b5d2a5e0 | 1260 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1261 | device->generation = card->generation; |
5f480477 KH |
1262 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1263 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
1264 | schedule_delayed_work(&device->work, 0); | |
1265 | } | |
19a15b93 KH |
1266 | break; |
1267 | ||
1268 | case FW_NODE_DESTROYED: | |
1269 | case FW_NODE_LINK_OFF: | |
1270 | if (!node->data) | |
1271 | break; | |
1272 | ||
c781c06d KH |
1273 | /* |
1274 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1275 | * are two cases here: either the device is fully |
1276 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1277 | * process of reading its config rom | |
1278 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1279 | * initialized we can reuse device->work to schedule a | |
1280 | * full fw_device_shutdown(). If not, there's work | |
1281 | * scheduled to read it's config rom, and we just put | |
1282 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1283 | * to create the device. |
1284 | */ | |
19a15b93 | 1285 | device = node->data; |
641f8791 | 1286 | if (atomic_xchg(&device->state, |
3d36a0df | 1287 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1288 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
e747a5c0 SR |
1289 | schedule_delayed_work(&device->work, |
1290 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); | |
19a15b93 KH |
1291 | } |
1292 | break; | |
1293 | } | |
1294 | } |