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 | ||
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 | 35 | #include <linux/rwsem.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 | 45 | |
13b302d0 | 46 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p) |
19a15b93 KH |
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 | ||
13b302d0 | 62 | static const u32 *search_leaf(const u32 *directory, int search_key) |
1f8fef7b CL |
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 | ||
13b302d0 | 79 | static int textual_leaf_to_string(const u32 *block, char *buf, size_t size) |
1f8fef7b | 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 | 118 | */ |
13b302d0 | 119 | int fw_csr_string(const u32 *directory, int key, char *buf, size_t size) |
1f8fef7b | 120 | { |
13b302d0 | 121 | const u32 *leaf = search_leaf(directory, key); |
1f8fef7b CL |
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 | ||
fe43d6d9 | 129 | static void get_ids(const u32 *directory, int *id) |
19a15b93 KH |
130 | { |
131 | struct fw_csr_iterator ci; | |
fe43d6d9 | 132 | int key, value; |
19a15b93 | 133 | |
19a15b93 KH |
134 | fw_csr_iterator_init(&ci, directory); |
135 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
fe43d6d9 SR |
136 | switch (key) { |
137 | case CSR_VENDOR: id[0] = value; break; | |
138 | case CSR_MODEL: id[1] = value; break; | |
139 | case CSR_SPECIFIER_ID: id[2] = value; break; | |
140 | case CSR_VERSION: id[3] = value; break; | |
141 | } | |
19a15b93 | 142 | } |
fe43d6d9 | 143 | } |
19a15b93 | 144 | |
fe43d6d9 SR |
145 | static void get_modalias_ids(struct fw_unit *unit, int *id) |
146 | { | |
147 | get_ids(&fw_parent_device(unit)->config_rom[5], id); | |
148 | get_ids(unit->directory, id); | |
149 | } | |
19a15b93 | 150 | |
fe43d6d9 SR |
151 | static bool match_ids(const struct ieee1394_device_id *id_table, int *id) |
152 | { | |
153 | int match = 0; | |
154 | ||
155 | if (id[0] == id_table->vendor_id) | |
156 | match |= IEEE1394_MATCH_VENDOR_ID; | |
157 | if (id[1] == id_table->model_id) | |
158 | match |= IEEE1394_MATCH_MODEL_ID; | |
159 | if (id[2] == id_table->specifier_id) | |
160 | match |= IEEE1394_MATCH_SPECIFIER_ID; | |
161 | if (id[3] == id_table->version) | |
162 | match |= IEEE1394_MATCH_VERSION; | |
163 | ||
164 | return (match & id_table->match_flags) == id_table->match_flags; | |
19a15b93 KH |
165 | } |
166 | ||
fe43d6d9 SR |
167 | static bool is_fw_unit(struct device *dev); |
168 | ||
19a15b93 KH |
169 | static int fw_unit_match(struct device *dev, struct device_driver *drv) |
170 | { | |
fe43d6d9 SR |
171 | const struct ieee1394_device_id *id_table = |
172 | container_of(drv, struct fw_driver, driver)->id_table; | |
173 | int id[] = {0, 0, 0, 0}; | |
19a15b93 KH |
174 | |
175 | /* We only allow binding to fw_units. */ | |
176 | if (!is_fw_unit(dev)) | |
177 | return 0; | |
178 | ||
fe43d6d9 | 179 | get_modalias_ids(fw_unit(dev), id); |
e41f8d70 | 180 | |
fe43d6d9 SR |
181 | for (; id_table->match_flags != 0; id_table++) |
182 | if (match_ids(id_table, id)) | |
19a15b93 | 183 | return 1; |
19a15b93 KH |
184 | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
189 | { | |
5ae73518 | 190 | int id[] = {0, 0, 0, 0}; |
19a15b93 | 191 | |
fe43d6d9 | 192 | get_modalias_ids(unit, id); |
19a15b93 KH |
193 | |
194 | return snprintf(buffer, buffer_size, | |
195 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
5ae73518 | 196 | id[0], id[1], id[2], id[3]); |
19a15b93 KH |
197 | } |
198 | ||
53dca511 | 199 | static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
200 | { |
201 | struct fw_unit *unit = fw_unit(dev); | |
202 | char modalias[64]; | |
19a15b93 | 203 | |
2d826cc5 | 204 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 205 | |
7eff2e7a | 206 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
207 | return -ENOMEM; |
208 | ||
19a15b93 KH |
209 | return 0; |
210 | } | |
211 | ||
212 | struct bus_type fw_bus_type = { | |
362c2c8c | 213 | .name = "firewire", |
19a15b93 | 214 | .match = fw_unit_match, |
19a15b93 | 215 | }; |
19a15b93 KH |
216 | EXPORT_SYMBOL(fw_bus_type); |
217 | ||
19a15b93 KH |
218 | int fw_device_enable_phys_dma(struct fw_device *device) |
219 | { | |
b5d2a5e0 SR |
220 | int generation = device->generation; |
221 | ||
222 | /* device->node_id, accessed below, must not be older than generation */ | |
223 | smp_rmb(); | |
224 | ||
19a15b93 KH |
225 | return device->card->driver->enable_phys_dma(device->card, |
226 | device->node_id, | |
b5d2a5e0 | 227 | generation); |
19a15b93 | 228 | } |
19a15b93 KH |
229 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
230 | ||
7feb9cce KH |
231 | struct config_rom_attribute { |
232 | struct device_attribute attr; | |
233 | u32 key; | |
234 | }; | |
235 | ||
53dca511 SR |
236 | static ssize_t show_immediate(struct device *dev, |
237 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
238 | { |
239 | struct config_rom_attribute *attr = | |
240 | container_of(dattr, struct config_rom_attribute, attr); | |
241 | struct fw_csr_iterator ci; | |
13b302d0 | 242 | const u32 *dir; |
c9755e14 SR |
243 | int key, value, ret = -ENOENT; |
244 | ||
245 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
246 | |
247 | if (is_fw_unit(dev)) | |
248 | dir = fw_unit(dev)->directory; | |
249 | else | |
250 | dir = fw_device(dev)->config_rom + 5; | |
251 | ||
252 | fw_csr_iterator_init(&ci, dir); | |
253 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
254 | if (attr->key == key) { |
255 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
256 | "0x%06x\n", value); | |
257 | break; | |
258 | } | |
259 | ||
260 | up_read(&fw_device_rwsem); | |
7feb9cce | 261 | |
c9755e14 | 262 | return ret; |
7feb9cce KH |
263 | } |
264 | ||
265 | #define IMMEDIATE_ATTR(name, key) \ | |
266 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
267 | ||
53dca511 SR |
268 | static ssize_t show_text_leaf(struct device *dev, |
269 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
270 | { |
271 | struct config_rom_attribute *attr = | |
272 | container_of(dattr, struct config_rom_attribute, attr); | |
13b302d0 | 273 | const u32 *dir; |
1f8fef7b CL |
274 | size_t bufsize; |
275 | char dummy_buf[2]; | |
276 | int ret; | |
7feb9cce | 277 | |
c9755e14 SR |
278 | down_read(&fw_device_rwsem); |
279 | ||
7feb9cce KH |
280 | if (is_fw_unit(dev)) |
281 | dir = fw_unit(dev)->directory; | |
282 | else | |
283 | dir = fw_device(dev)->config_rom + 5; | |
284 | ||
1f8fef7b CL |
285 | if (buf) { |
286 | bufsize = PAGE_SIZE - 1; | |
287 | } else { | |
288 | buf = dummy_buf; | |
289 | bufsize = 1; | |
7feb9cce KH |
290 | } |
291 | ||
1f8fef7b | 292 | ret = fw_csr_string(dir, attr->key, buf, bufsize); |
7feb9cce | 293 | |
1f8fef7b CL |
294 | if (ret >= 0) { |
295 | /* Strip trailing whitespace and add newline. */ | |
296 | while (ret > 0 && isspace(buf[ret - 1])) | |
297 | ret--; | |
298 | strcpy(buf + ret, "\n"); | |
299 | ret++; | |
c9755e14 | 300 | } |
7feb9cce | 301 | |
c9755e14 | 302 | up_read(&fw_device_rwsem); |
7feb9cce | 303 | |
c9755e14 | 304 | return ret; |
7feb9cce KH |
305 | } |
306 | ||
307 | #define TEXT_LEAF_ATTR(name, key) \ | |
308 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
309 | ||
310 | static struct config_rom_attribute config_rom_attributes[] = { | |
311 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
312 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
313 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
314 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
315 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
316 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
317 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
318 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
319 | }; | |
320 | ||
53dca511 SR |
321 | static void init_fw_attribute_group(struct device *dev, |
322 | struct device_attribute *attrs, | |
323 | struct fw_attribute_group *group) | |
7feb9cce KH |
324 | { |
325 | struct device_attribute *attr; | |
6f2e53d5 KH |
326 | int i, j; |
327 | ||
328 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
329 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
330 | |
331 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
332 | attr = &config_rom_attributes[i].attr; | |
333 | if (attr->show(dev, attr, NULL) < 0) | |
334 | continue; | |
6f2e53d5 | 335 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
336 | } |
337 | ||
e5333db9 | 338 | group->attrs[j] = NULL; |
6f2e53d5 KH |
339 | group->groups[0] = &group->group; |
340 | group->groups[1] = NULL; | |
341 | group->group.attrs = group->attrs; | |
a4dbd674 | 342 | dev->groups = (const struct attribute_group **) group->groups; |
7feb9cce KH |
343 | } |
344 | ||
53dca511 SR |
345 | static ssize_t modalias_show(struct device *dev, |
346 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
347 | { |
348 | struct fw_unit *unit = fw_unit(dev); | |
349 | int length; | |
350 | ||
351 | length = get_modalias(unit, buf, PAGE_SIZE); | |
352 | strcpy(buf + length, "\n"); | |
353 | ||
354 | return length + 1; | |
355 | } | |
356 | ||
53dca511 SR |
357 | static ssize_t rom_index_show(struct device *dev, |
358 | struct device_attribute *attr, char *buf) | |
19a15b93 | 359 | { |
21351dbe KH |
360 | struct fw_device *device = fw_device(dev->parent); |
361 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 362 | |
21351dbe KH |
363 | return snprintf(buf, PAGE_SIZE, "%d\n", |
364 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
365 | } |
366 | ||
21351dbe KH |
367 | static struct device_attribute fw_unit_attributes[] = { |
368 | __ATTR_RO(modalias), | |
369 | __ATTR_RO(rom_index), | |
370 | __ATTR_NULL, | |
19a15b93 KH |
371 | }; |
372 | ||
53dca511 SR |
373 | static ssize_t config_rom_show(struct device *dev, |
374 | struct device_attribute *attr, char *buf) | |
048961ef | 375 | { |
21351dbe | 376 | struct fw_device *device = fw_device(dev); |
c9755e14 | 377 | size_t length; |
048961ef | 378 | |
c9755e14 SR |
379 | down_read(&fw_device_rwsem); |
380 | length = device->config_rom_length * 4; | |
381 | memcpy(buf, device->config_rom, length); | |
382 | up_read(&fw_device_rwsem); | |
21351dbe | 383 | |
c9755e14 | 384 | return length; |
048961ef KH |
385 | } |
386 | ||
53dca511 SR |
387 | static ssize_t guid_show(struct device *dev, |
388 | struct device_attribute *attr, char *buf) | |
bbd14945 KH |
389 | { |
390 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
391 | int ret; |
392 | ||
393 | down_read(&fw_device_rwsem); | |
394 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
395 | device->config_rom[3], device->config_rom[4]); | |
396 | up_read(&fw_device_rwsem); | |
bbd14945 | 397 | |
c9755e14 | 398 | return ret; |
bbd14945 KH |
399 | } |
400 | ||
13b302d0 | 401 | static int units_sprintf(char *buf, const u32 *directory) |
0210b66d SR |
402 | { |
403 | struct fw_csr_iterator ci; | |
404 | int key, value; | |
405 | int specifier_id = 0; | |
406 | int version = 0; | |
407 | ||
408 | fw_csr_iterator_init(&ci, directory); | |
409 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
410 | switch (key) { | |
411 | case CSR_SPECIFIER_ID: | |
412 | specifier_id = value; | |
413 | break; | |
414 | case CSR_VERSION: | |
415 | version = value; | |
416 | break; | |
417 | } | |
418 | } | |
419 | ||
420 | return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version); | |
421 | } | |
422 | ||
423 | static ssize_t units_show(struct device *dev, | |
424 | struct device_attribute *attr, char *buf) | |
425 | { | |
426 | struct fw_device *device = fw_device(dev); | |
427 | struct fw_csr_iterator ci; | |
428 | int key, value, i = 0; | |
429 | ||
430 | down_read(&fw_device_rwsem); | |
431 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
432 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
433 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
434 | continue; | |
435 | i += units_sprintf(&buf[i], ci.p + value - 1); | |
436 | if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) | |
437 | break; | |
438 | } | |
439 | up_read(&fw_device_rwsem); | |
440 | ||
441 | if (i) | |
442 | buf[i - 1] = '\n'; | |
443 | ||
444 | return i; | |
445 | } | |
446 | ||
21351dbe KH |
447 | static struct device_attribute fw_device_attributes[] = { |
448 | __ATTR_RO(config_rom), | |
bbd14945 | 449 | __ATTR_RO(guid), |
0210b66d | 450 | __ATTR_RO(units), |
21351dbe | 451 | __ATTR_NULL, |
048961ef KH |
452 | }; |
453 | ||
53dca511 SR |
454 | static int read_rom(struct fw_device *device, |
455 | int generation, int index, u32 *data) | |
19a15b93 | 456 | { |
1e119fa9 | 457 | int rcode; |
b5d2a5e0 SR |
458 | |
459 | /* device->node_id, accessed below, must not be older than generation */ | |
460 | smp_rmb(); | |
19a15b93 | 461 | |
1e119fa9 | 462 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 463 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
464 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
465 | data, 4); | |
466 | be32_to_cpus(data); | |
19a15b93 | 467 | |
1e119fa9 | 468 | return rcode; |
19a15b93 KH |
469 | } |
470 | ||
fd6e0c51 | 471 | #define MAX_CONFIG_ROM_SIZE 256 |
1dadff71 | 472 | |
f8d2dc39 SR |
473 | /* |
474 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
475 | * the config ROM. We do all this with a cached bus generation. If the bus | |
fd6e0c51 | 476 | * generation changes under us, read_config_rom will fail and get retried. |
f8d2dc39 SR |
477 | * It's better to start all over in this case because the node from which we |
478 | * are reading the ROM may have changed the ROM during the reset. | |
479 | */ | |
fd6e0c51 | 480 | static int read_config_rom(struct fw_device *device, int generation) |
19a15b93 | 481 | { |
13b302d0 SR |
482 | const u32 *old_rom, *new_rom; |
483 | u32 *rom, *stack; | |
1dadff71 SR |
484 | u32 sp, key; |
485 | int i, end, length, ret = -1; | |
486 | ||
fd6e0c51 SR |
487 | rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE + |
488 | sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL); | |
1dadff71 SR |
489 | if (rom == NULL) |
490 | return -ENOMEM; | |
491 | ||
fd6e0c51 SR |
492 | stack = &rom[MAX_CONFIG_ROM_SIZE]; |
493 | memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE); | |
19a15b93 | 494 | |
f1397490 SR |
495 | device->max_speed = SCODE_100; |
496 | ||
19a15b93 KH |
497 | /* First read the bus info block. */ |
498 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 499 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 500 | goto out; |
c781c06d KH |
501 | /* |
502 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
503 | * reply with a 0 for the first quadlet of the config |
504 | * rom to indicate that they are booting (for example, | |
505 | * if the firmware is on the disk of a external | |
506 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
507 | * retry mechanism will try again later. |
508 | */ | |
19a15b93 | 509 | if (i == 0 && rom[i] == 0) |
1dadff71 | 510 | goto out; |
19a15b93 KH |
511 | } |
512 | ||
f1397490 SR |
513 | device->max_speed = device->node->max_speed; |
514 | ||
515 | /* | |
516 | * Determine the speed of | |
517 | * - devices with link speed less than PHY speed, | |
518 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
519 | * - all devices if there are 1394b repeaters. | |
520 | * Note, we cannot use the bus info block's link_spd as starting point | |
521 | * because some buggy firmwares set it lower than necessary and because | |
522 | * 1394-1995 nodes do not have the field. | |
523 | */ | |
524 | if ((rom[2] & 0x7) < device->max_speed || | |
525 | device->max_speed == SCODE_BETA || | |
526 | device->card->beta_repeaters_present) { | |
527 | u32 dummy; | |
528 | ||
529 | /* for S1600 and S3200 */ | |
530 | if (device->max_speed == SCODE_BETA) | |
531 | device->max_speed = device->card->link_speed; | |
532 | ||
533 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
534 | if (read_rom(device, generation, 0, &dummy) == |
535 | RCODE_COMPLETE) | |
f1397490 SR |
536 | break; |
537 | device->max_speed--; | |
538 | } | |
539 | } | |
540 | ||
c781c06d KH |
541 | /* |
542 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
543 | * directory structure so we parse it using a stack of |
544 | * references to the blocks that make up the structure. We | |
545 | * push a reference to the root directory on the stack to | |
c781c06d KH |
546 | * start things off. |
547 | */ | |
19a15b93 KH |
548 | length = i; |
549 | sp = 0; | |
550 | stack[sp++] = 0xc0000005; | |
551 | while (sp > 0) { | |
c781c06d KH |
552 | /* |
553 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
554 | * lower 24 bits is the offset into the config rom, |
555 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
556 | * block. |
557 | */ | |
19a15b93 KH |
558 | key = stack[--sp]; |
559 | i = key & 0xffffff; | |
fd6e0c51 | 560 | if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) |
1dadff71 | 561 | goto out; |
19a15b93 KH |
562 | |
563 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 564 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 565 | goto out; |
19a15b93 | 566 | end = i + (rom[i] >> 16) + 1; |
fd6e0c51 | 567 | if (end > MAX_CONFIG_ROM_SIZE) { |
c781c06d | 568 | /* |
2799d5c5 SR |
569 | * This block extends outside the config ROM which is |
570 | * a firmware bug. Ignore this whole block, i.e. | |
571 | * simply set a fake block length of 0. | |
c781c06d | 572 | */ |
2799d5c5 SR |
573 | fw_error("skipped invalid ROM block %x at %llx\n", |
574 | rom[i], | |
575 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); | |
576 | rom[i] = 0; | |
577 | end = i; | |
578 | } | |
579 | i++; | |
19a15b93 | 580 | |
c781c06d KH |
581 | /* |
582 | * Now read in the block. If this is a directory | |
19a15b93 | 583 | * block, check the entries as we read them to see if |
c781c06d KH |
584 | * it references another block, and push it in that case. |
585 | */ | |
d54423c6 | 586 | for (; i < end; i++) { |
f8d2dc39 SR |
587 | if (read_rom(device, generation, i, &rom[i]) != |
588 | RCODE_COMPLETE) | |
1dadff71 | 589 | goto out; |
d54423c6 | 590 | |
58aaa542 | 591 | if ((key >> 30) != 3 || (rom[i] >> 30) < 2) |
d54423c6 SR |
592 | continue; |
593 | /* | |
594 | * Offset points outside the ROM. May be a firmware | |
595 | * bug or an Extended ROM entry (IEEE 1212-2001 clause | |
596 | * 7.7.18). Simply overwrite this pointer here by a | |
597 | * fake immediate entry so that later iterators over | |
598 | * the ROM don't have to check offsets all the time. | |
599 | */ | |
fd6e0c51 | 600 | if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) { |
d54423c6 SR |
601 | fw_error("skipped unsupported ROM entry %x at %llx\n", |
602 | rom[i], | |
603 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); | |
604 | rom[i] = 0; | |
605 | continue; | |
606 | } | |
607 | stack[sp++] = i + rom[i]; | |
19a15b93 KH |
608 | } |
609 | if (length < i) | |
610 | length = i; | |
611 | } | |
612 | ||
c9755e14 SR |
613 | old_rom = device->config_rom; |
614 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
615 | if (new_rom == NULL) | |
1dadff71 | 616 | goto out; |
c9755e14 SR |
617 | |
618 | down_write(&fw_device_rwsem); | |
619 | device->config_rom = new_rom; | |
19a15b93 | 620 | device->config_rom_length = length; |
c9755e14 SR |
621 | up_write(&fw_device_rwsem); |
622 | ||
623 | kfree(old_rom); | |
1dadff71 | 624 | ret = 0; |
837ec787 SR |
625 | device->max_rec = rom[2] >> 12 & 0xf; |
626 | device->cmc = rom[2] >> 30 & 1; | |
627 | device->irmc = rom[2] >> 31 & 1; | |
1dadff71 SR |
628 | out: |
629 | kfree(rom); | |
19a15b93 | 630 | |
1dadff71 | 631 | return ret; |
19a15b93 KH |
632 | } |
633 | ||
634 | static void fw_unit_release(struct device *dev) | |
635 | { | |
636 | struct fw_unit *unit = fw_unit(dev); | |
637 | ||
638 | kfree(unit); | |
639 | } | |
640 | ||
21351dbe | 641 | static struct device_type fw_unit_type = { |
21351dbe KH |
642 | .uevent = fw_unit_uevent, |
643 | .release = fw_unit_release, | |
644 | }; | |
645 | ||
099d5414 | 646 | static bool is_fw_unit(struct device *dev) |
19a15b93 | 647 | { |
21351dbe | 648 | return dev->type == &fw_unit_type; |
19a15b93 KH |
649 | } |
650 | ||
651 | static void create_units(struct fw_device *device) | |
652 | { | |
653 | struct fw_csr_iterator ci; | |
654 | struct fw_unit *unit; | |
655 | int key, value, i; | |
656 | ||
657 | i = 0; | |
658 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
659 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
660 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
661 | continue; | |
662 | ||
c781c06d KH |
663 | /* |
664 | * Get the address of the unit directory and try to | |
665 | * match the drivers id_tables against it. | |
666 | */ | |
2d826cc5 | 667 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
668 | if (unit == NULL) { |
669 | fw_error("failed to allocate memory for unit\n"); | |
670 | continue; | |
671 | } | |
672 | ||
673 | unit->directory = ci.p + value - 1; | |
674 | unit->device.bus = &fw_bus_type; | |
21351dbe | 675 | unit->device.type = &fw_unit_type; |
19a15b93 | 676 | unit->device.parent = &device->device; |
a1f64819 | 677 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 678 | |
e5333db9 SR |
679 | BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) < |
680 | ARRAY_SIZE(fw_unit_attributes) + | |
681 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
682 | init_fw_attribute_group(&unit->device, |
683 | fw_unit_attributes, | |
684 | &unit->attribute_group); | |
e5333db9 | 685 | |
7feb9cce KH |
686 | if (device_register(&unit->device) < 0) |
687 | goto skip_unit; | |
688 | ||
7feb9cce KH |
689 | continue; |
690 | ||
7feb9cce KH |
691 | skip_unit: |
692 | kfree(unit); | |
19a15b93 KH |
693 | } |
694 | } | |
695 | ||
696 | static int shutdown_unit(struct device *device, void *data) | |
697 | { | |
21351dbe | 698 | device_unregister(device); |
19a15b93 KH |
699 | |
700 | return 0; | |
701 | } | |
702 | ||
c9755e14 SR |
703 | /* |
704 | * fw_device_rwsem acts as dual purpose mutex: | |
705 | * - serializes accesses to fw_device_idr, | |
706 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
707 | * fw_unit.directory, unless those accesses happen at safe occasions | |
708 | */ | |
709 | DECLARE_RWSEM(fw_device_rwsem); | |
710 | ||
d6053e08 | 711 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
712 | int fw_cdev_major; |
713 | ||
96b19062 | 714 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
715 | { |
716 | struct fw_device *device; | |
717 | ||
c9755e14 | 718 | down_read(&fw_device_rwsem); |
a3aca3da | 719 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
720 | if (device) |
721 | fw_device_get(device); | |
c9755e14 | 722 | up_read(&fw_device_rwsem); |
a3aca3da KH |
723 | |
724 | return device; | |
725 | } | |
726 | ||
3d36a0df SR |
727 | /* |
728 | * These defines control the retry behavior for reading the config | |
729 | * rom. It shouldn't be necessary to tweak these; if the device | |
730 | * doesn't respond to a config rom read within 10 seconds, it's not | |
731 | * going to respond at all. As for the initial delay, a lot of | |
732 | * devices will be able to respond within half a second after bus | |
733 | * reset. On the other hand, it's not really worth being more | |
734 | * aggressive than that, since it scales pretty well; if 10 devices | |
735 | * are plugged in, they're all getting read within one second. | |
736 | */ | |
737 | ||
738 | #define MAX_RETRIES 10 | |
739 | #define RETRY_DELAY (3 * HZ) | |
740 | #define INITIAL_DELAY (HZ / 2) | |
741 | #define SHUTDOWN_DELAY (2 * HZ) | |
742 | ||
19a15b93 KH |
743 | static void fw_device_shutdown(struct work_struct *work) |
744 | { | |
745 | struct fw_device *device = | |
746 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
747 | int minor = MINOR(device->device.devt); |
748 | ||
e747a5c0 SR |
749 | if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) |
750 | && !list_empty(&device->card->link)) { | |
3d36a0df SR |
751 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); |
752 | return; | |
753 | } | |
754 | ||
755 | if (atomic_cmpxchg(&device->state, | |
756 | FW_DEVICE_GONE, | |
757 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
758 | return; | |
759 | ||
2603bf21 | 760 | fw_device_cdev_remove(device); |
19a15b93 KH |
761 | device_for_each_child(&device->device, NULL, shutdown_unit); |
762 | device_unregister(&device->device); | |
96b19062 | 763 | |
c9755e14 | 764 | down_write(&fw_device_rwsem); |
96b19062 | 765 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 766 | up_write(&fw_device_rwsem); |
3d36a0df | 767 | |
96b19062 | 768 | fw_device_put(device); |
19a15b93 KH |
769 | } |
770 | ||
aed80892 SR |
771 | static void fw_device_release(struct device *dev) |
772 | { | |
773 | struct fw_device *device = fw_device(dev); | |
774 | struct fw_card *card = device->card; | |
775 | unsigned long flags; | |
776 | ||
777 | /* | |
778 | * Take the card lock so we don't set this to NULL while a | |
779 | * FW_NODE_UPDATED callback is being handled or while the | |
780 | * bus manager work looks at this node. | |
781 | */ | |
782 | spin_lock_irqsave(&card->lock, flags); | |
783 | device->node->data = NULL; | |
784 | spin_unlock_irqrestore(&card->lock, flags); | |
785 | ||
786 | fw_node_put(device->node); | |
787 | kfree(device->config_rom); | |
788 | kfree(device); | |
789 | fw_card_put(card); | |
790 | } | |
791 | ||
21351dbe | 792 | static struct device_type fw_device_type = { |
aed80892 | 793 | .release = fw_device_release, |
21351dbe KH |
794 | }; |
795 | ||
099d5414 SR |
796 | static bool is_fw_device(struct device *dev) |
797 | { | |
798 | return dev->type == &fw_device_type; | |
799 | } | |
800 | ||
aed80892 SR |
801 | static int update_unit(struct device *dev, void *data) |
802 | { | |
803 | struct fw_unit *unit = fw_unit(dev); | |
804 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
805 | ||
806 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { | |
8e9394ce | 807 | device_lock(dev); |
aed80892 | 808 | driver->update(unit); |
8e9394ce | 809 | device_unlock(dev); |
aed80892 SR |
810 | } |
811 | ||
812 | return 0; | |
813 | } | |
814 | ||
815 | static void fw_device_update(struct work_struct *work) | |
816 | { | |
817 | struct fw_device *device = | |
818 | container_of(work, struct fw_device, work.work); | |
819 | ||
820 | fw_device_cdev_update(device); | |
821 | device_for_each_child(&device->device, NULL, update_unit); | |
822 | } | |
3d36a0df | 823 | |
c781c06d | 824 | /* |
3d36a0df SR |
825 | * If a device was pending for deletion because its node went away but its |
826 | * bus info block and root directory header matches that of a newly discovered | |
827 | * device, revive the existing fw_device. | |
828 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 829 | */ |
3d36a0df SR |
830 | static int lookup_existing_device(struct device *dev, void *data) |
831 | { | |
832 | struct fw_device *old = fw_device(dev); | |
833 | struct fw_device *new = data; | |
834 | struct fw_card *card = new->card; | |
835 | int match = 0; | |
836 | ||
099d5414 SR |
837 | if (!is_fw_device(dev)) |
838 | return 0; | |
839 | ||
3d36a0df SR |
840 | down_read(&fw_device_rwsem); /* serialize config_rom access */ |
841 | spin_lock_irq(&card->lock); /* serialize node access */ | |
842 | ||
843 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
844 | atomic_cmpxchg(&old->state, | |
845 | FW_DEVICE_GONE, | |
846 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
847 | struct fw_node *current_node = new->node; | |
848 | struct fw_node *obsolete_node = old->node; | |
849 | ||
850 | new->node = obsolete_node; | |
851 | new->node->data = new; | |
852 | old->node = current_node; | |
853 | old->node->data = old; | |
854 | ||
855 | old->max_speed = new->max_speed; | |
856 | old->node_id = current_node->node_id; | |
857 | smp_wmb(); /* update node_id before generation */ | |
858 | old->generation = card->generation; | |
859 | old->config_rom_retries = 0; | |
860 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 861 | |
3d36a0df SR |
862 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
863 | schedule_delayed_work(&old->work, 0); | |
864 | ||
865 | if (current_node == card->root_node) | |
866 | fw_schedule_bm_work(card, 0); | |
867 | ||
868 | match = 1; | |
869 | } | |
870 | ||
871 | spin_unlock_irq(&card->lock); | |
872 | up_read(&fw_device_rwsem); | |
873 | ||
874 | return match; | |
875 | } | |
19a15b93 | 876 | |
7889b60e SR |
877 | enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; |
878 | ||
099d5414 | 879 | static void set_broadcast_channel(struct fw_device *device, int generation) |
7889b60e SR |
880 | { |
881 | struct fw_card *card = device->card; | |
882 | __be32 data; | |
883 | int rcode; | |
884 | ||
885 | if (!card->broadcast_channel_allocated) | |
886 | return; | |
887 | ||
837ec787 SR |
888 | /* |
889 | * The Broadcast_Channel Valid bit is required by nodes which want to | |
890 | * transmit on this channel. Such transmissions are practically | |
891 | * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required | |
892 | * to be IRM capable and have a max_rec of 8 or more. We use this fact | |
893 | * to narrow down to which nodes we send Broadcast_Channel updates. | |
894 | */ | |
895 | if (!device->irmc || device->max_rec < 8) | |
896 | return; | |
897 | ||
898 | /* | |
899 | * Some 1394-1995 nodes crash if this 1394a-2000 register is written. | |
900 | * Perform a read test first. | |
901 | */ | |
7889b60e SR |
902 | if (device->bc_implemented == BC_UNKNOWN) { |
903 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, | |
904 | device->node_id, generation, device->max_speed, | |
905 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
906 | &data, 4); | |
907 | switch (rcode) { | |
908 | case RCODE_COMPLETE: | |
909 | if (data & cpu_to_be32(1 << 31)) { | |
910 | device->bc_implemented = BC_IMPLEMENTED; | |
911 | break; | |
912 | } | |
913 | /* else fall through to case address error */ | |
914 | case RCODE_ADDRESS_ERROR: | |
915 | device->bc_implemented = BC_UNIMPLEMENTED; | |
916 | } | |
917 | } | |
918 | ||
919 | if (device->bc_implemented == BC_IMPLEMENTED) { | |
920 | data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | | |
921 | BROADCAST_CHANNEL_VALID); | |
922 | fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, | |
923 | device->node_id, generation, device->max_speed, | |
924 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
925 | &data, 4); | |
926 | } | |
927 | } | |
928 | ||
099d5414 SR |
929 | int fw_device_set_broadcast_channel(struct device *dev, void *gen) |
930 | { | |
931 | if (is_fw_device(dev)) | |
932 | set_broadcast_channel(fw_device(dev), (long)gen); | |
933 | ||
934 | return 0; | |
935 | } | |
936 | ||
19a15b93 KH |
937 | static void fw_device_init(struct work_struct *work) |
938 | { | |
19a15b93 KH |
939 | struct fw_device *device = |
940 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 941 | struct device *revived_dev; |
e1eff7a3 | 942 | int minor, ret; |
19a15b93 | 943 | |
c781c06d KH |
944 | /* |
945 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 946 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
947 | * device. |
948 | */ | |
19a15b93 | 949 | |
fd6e0c51 | 950 | if (read_config_rom(device, device->generation) < 0) { |
855c603d SR |
951 | if (device->config_rom_retries < MAX_RETRIES && |
952 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
953 | device->config_rom_retries++; |
954 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
955 | } else { | |
907293d7 | 956 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 957 | device->node_id); |
931c4834 | 958 | if (device->node == device->card->root_node) |
0fa1986f | 959 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
960 | fw_device_release(&device->device); |
961 | } | |
962 | return; | |
963 | } | |
964 | ||
3d36a0df SR |
965 | revived_dev = device_find_child(device->card->device, |
966 | device, lookup_existing_device); | |
967 | if (revived_dev) { | |
968 | put_device(revived_dev); | |
969 | fw_device_release(&device->device); | |
970 | ||
971 | return; | |
972 | } | |
973 | ||
62305823 | 974 | device_initialize(&device->device); |
96b19062 SR |
975 | |
976 | fw_device_get(device); | |
c9755e14 | 977 | down_write(&fw_device_rwsem); |
e1eff7a3 | 978 | ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
62305823 SR |
979 | idr_get_new(&fw_device_idr, device, &minor) : |
980 | -ENOMEM; | |
c9755e14 | 981 | up_write(&fw_device_rwsem); |
96b19062 | 982 | |
e1eff7a3 | 983 | if (ret < 0) |
a3aca3da KH |
984 | goto error; |
985 | ||
19a15b93 | 986 | device->device.bus = &fw_bus_type; |
21351dbe | 987 | device->device.type = &fw_device_type; |
19a15b93 | 988 | device->device.parent = device->card->device; |
a3aca3da | 989 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 990 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 991 | |
e5333db9 SR |
992 | BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) < |
993 | ARRAY_SIZE(fw_device_attributes) + | |
994 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
995 | init_fw_attribute_group(&device->device, |
996 | fw_device_attributes, | |
997 | &device->attribute_group); | |
e5333db9 | 998 | |
19a15b93 KH |
999 | if (device_add(&device->device)) { |
1000 | fw_error("Failed to add device.\n"); | |
a3aca3da | 1001 | goto error_with_cdev; |
19a15b93 KH |
1002 | } |
1003 | ||
19a15b93 KH |
1004 | create_units(device); |
1005 | ||
c781c06d KH |
1006 | /* |
1007 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
1008 | * out from under us while we did the intialization work, we |
1009 | * have to shut down the device again here. Normally, though, | |
1010 | * fw_node_event will be responsible for shutting it down when | |
1011 | * necessary. We have to use the atomic cmpxchg here to avoid | |
1012 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
1013 | * fw_node_event(). |
1014 | */ | |
641f8791 | 1015 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1016 | FW_DEVICE_INITIALIZING, |
1017 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
1018 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
1019 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
fa6e697b SR |
1020 | } else { |
1021 | if (device->config_rom_retries) | |
1022 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
1023 | "%d config ROM retries\n", | |
a1f64819 | 1024 | dev_name(&device->device), |
fa6e697b SR |
1025 | device->config_rom[3], device->config_rom[4], |
1026 | 1 << device->max_speed, | |
1027 | device->config_rom_retries); | |
1028 | else | |
1029 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 1030 | dev_name(&device->device), |
fa6e697b SR |
1031 | device->config_rom[3], device->config_rom[4], |
1032 | 1 << device->max_speed); | |
c9755e14 | 1033 | device->config_rom_retries = 0; |
7889b60e | 1034 | |
099d5414 | 1035 | set_broadcast_channel(device, device->generation); |
fa6e697b | 1036 | } |
19a15b93 | 1037 | |
c781c06d KH |
1038 | /* |
1039 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
1040 | * root node config rom. If this races with a bus reset we |
1041 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
1042 | * pretty harmless. |
1043 | */ | |
19a15b93 | 1044 | if (device->node == device->card->root_node) |
0fa1986f | 1045 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
1046 | |
1047 | return; | |
1048 | ||
a3aca3da | 1049 | error_with_cdev: |
c9755e14 | 1050 | down_write(&fw_device_rwsem); |
a3aca3da | 1051 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 1052 | up_write(&fw_device_rwsem); |
373b2edd | 1053 | error: |
96b19062 SR |
1054 | fw_device_put(device); /* fw_device_idr's reference */ |
1055 | ||
1056 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
1057 | } |
1058 | ||
c9755e14 SR |
1059 | enum { |
1060 | REREAD_BIB_ERROR, | |
1061 | REREAD_BIB_GONE, | |
1062 | REREAD_BIB_UNCHANGED, | |
1063 | REREAD_BIB_CHANGED, | |
1064 | }; | |
1065 | ||
1066 | /* Reread and compare bus info block and header of root directory */ | |
fd6e0c51 | 1067 | static int reread_config_rom(struct fw_device *device, int generation) |
c9755e14 SR |
1068 | { |
1069 | u32 q; | |
1070 | int i; | |
1071 | ||
1072 | for (i = 0; i < 6; i++) { | |
1073 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
1074 | return REREAD_BIB_ERROR; | |
1075 | ||
1076 | if (i == 0 && q == 0) | |
1077 | return REREAD_BIB_GONE; | |
1078 | ||
d01b0178 | 1079 | if (q != device->config_rom[i]) |
c9755e14 SR |
1080 | return REREAD_BIB_CHANGED; |
1081 | } | |
1082 | ||
1083 | return REREAD_BIB_UNCHANGED; | |
1084 | } | |
1085 | ||
1086 | static void fw_device_refresh(struct work_struct *work) | |
1087 | { | |
1088 | struct fw_device *device = | |
1089 | container_of(work, struct fw_device, work.work); | |
1090 | struct fw_card *card = device->card; | |
1091 | int node_id = device->node_id; | |
1092 | ||
fd6e0c51 | 1093 | switch (reread_config_rom(device, device->generation)) { |
c9755e14 SR |
1094 | case REREAD_BIB_ERROR: |
1095 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
1096 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1097 | device->config_rom_retries++; | |
1098 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
1099 | ||
1100 | return; | |
1101 | } | |
1102 | goto give_up; | |
1103 | ||
1104 | case REREAD_BIB_GONE: | |
1105 | goto gone; | |
1106 | ||
1107 | case REREAD_BIB_UNCHANGED: | |
1108 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
1109 | FW_DEVICE_INITIALIZING, |
1110 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1111 | goto gone; |
1112 | ||
1113 | fw_device_update(work); | |
1114 | device->config_rom_retries = 0; | |
1115 | goto out; | |
1116 | ||
1117 | case REREAD_BIB_CHANGED: | |
1118 | break; | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Something changed. We keep things simple and don't investigate | |
1123 | * further. We just destroy all previous units and create new ones. | |
1124 | */ | |
1125 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
1126 | ||
fd6e0c51 | 1127 | if (read_config_rom(device, device->generation) < 0) { |
c9755e14 SR |
1128 | if (device->config_rom_retries < MAX_RETRIES && |
1129 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1130 | device->config_rom_retries++; | |
1131 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
1132 | ||
1133 | return; | |
1134 | } | |
1135 | goto give_up; | |
1136 | } | |
1137 | ||
1138 | create_units(device); | |
1139 | ||
0210b66d SR |
1140 | /* Userspace may want to re-read attributes. */ |
1141 | kobject_uevent(&device->device.kobj, KOBJ_CHANGE); | |
1142 | ||
c9755e14 | 1143 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1144 | FW_DEVICE_INITIALIZING, |
1145 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1146 | goto gone; |
1147 | ||
a1f64819 | 1148 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
1149 | device->config_rom_retries = 0; |
1150 | goto out; | |
1151 | ||
1152 | give_up: | |
a1f64819 | 1153 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 1154 | gone: |
3d36a0df SR |
1155 | atomic_set(&device->state, FW_DEVICE_GONE); |
1156 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
1157 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
c9755e14 SR |
1158 | out: |
1159 | if (node_id == card->root_node->node_id) | |
0fa1986f | 1160 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
1161 | } |
1162 | ||
19a15b93 KH |
1163 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
1164 | { | |
1165 | struct fw_device *device; | |
1166 | ||
19a15b93 KH |
1167 | switch (event) { |
1168 | case FW_NODE_CREATED: | |
1169 | case FW_NODE_LINK_ON: | |
1170 | if (!node->link_on) | |
1171 | break; | |
c9755e14 | 1172 | create: |
19a15b93 KH |
1173 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
1174 | if (device == NULL) | |
1175 | break; | |
1176 | ||
c781c06d KH |
1177 | /* |
1178 | * Do minimal intialization of the device here, the | |
62305823 SR |
1179 | * rest will happen in fw_device_init(). |
1180 | * | |
1181 | * Attention: A lot of things, even fw_device_get(), | |
1182 | * cannot be done before fw_device_init() finished! | |
1183 | * You can basically just check device->state and | |
1184 | * schedule work until then, but only while holding | |
1185 | * card->lock. | |
c781c06d | 1186 | */ |
641f8791 | 1187 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1188 | device->card = fw_card_get(card); |
19a15b93 KH |
1189 | device->node = fw_node_get(node); |
1190 | device->node_id = node->node_id; | |
1191 | device->generation = card->generation; | |
92368890 | 1192 | device->is_local = node == card->local_node; |
d67cfb96 | 1193 | mutex_init(&device->client_list_mutex); |
97bd9efa | 1194 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1195 | |
c781c06d KH |
1196 | /* |
1197 | * Set the node data to point back to this device so | |
19a15b93 | 1198 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1199 | * and generation for the device. |
1200 | */ | |
19a15b93 KH |
1201 | node->data = device; |
1202 | ||
c781c06d KH |
1203 | /* |
1204 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1205 | * especially if they are bus powered and go through |
1206 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1207 | * first config rom scan half a second after bus reset. |
1208 | */ | |
19a15b93 KH |
1209 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1210 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
1211 | break; | |
1212 | ||
c9755e14 SR |
1213 | case FW_NODE_INITIATED_RESET: |
1214 | device = node->data; | |
1215 | if (device == NULL) | |
1216 | goto create; | |
1217 | ||
1218 | device->node_id = node->node_id; | |
1219 | smp_wmb(); /* update node_id before generation */ | |
1220 | device->generation = card->generation; | |
1221 | if (atomic_cmpxchg(&device->state, | |
1222 | FW_DEVICE_RUNNING, | |
1223 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1224 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
1225 | schedule_delayed_work(&device->work, | |
92368890 | 1226 | device->is_local ? 0 : INITIAL_DELAY); |
c9755e14 SR |
1227 | } |
1228 | break; | |
1229 | ||
19a15b93 KH |
1230 | case FW_NODE_UPDATED: |
1231 | if (!node->link_on || node->data == NULL) | |
1232 | break; | |
1233 | ||
1234 | device = node->data; | |
1235 | device->node_id = node->node_id; | |
b5d2a5e0 | 1236 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1237 | device->generation = card->generation; |
5f480477 KH |
1238 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1239 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
1240 | schedule_delayed_work(&device->work, 0); | |
1241 | } | |
19a15b93 KH |
1242 | break; |
1243 | ||
1244 | case FW_NODE_DESTROYED: | |
1245 | case FW_NODE_LINK_OFF: | |
1246 | if (!node->data) | |
1247 | break; | |
1248 | ||
c781c06d KH |
1249 | /* |
1250 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1251 | * are two cases here: either the device is fully |
1252 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1253 | * process of reading its config rom | |
1254 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1255 | * initialized we can reuse device->work to schedule a | |
1256 | * full fw_device_shutdown(). If not, there's work | |
1257 | * scheduled to read it's config rom, and we just put | |
1258 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1259 | * to create the device. |
1260 | */ | |
19a15b93 | 1261 | device = node->data; |
641f8791 | 1262 | if (atomic_xchg(&device->state, |
3d36a0df | 1263 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1264 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
e747a5c0 SR |
1265 | schedule_delayed_work(&device->work, |
1266 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); | |
19a15b93 KH |
1267 | } |
1268 | break; | |
1269 | } | |
1270 | } |