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> |
5a0e3ad6 | 36 | #include <linux/slab.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 | /** | |
656b7afd SR |
110 | * fw_csr_string() - reads a string from the configuration ROM |
111 | * @directory: e.g. root directory or unit directory | |
112 | * @key: the key of the preceding directory entry | |
113 | * @buf: where to put the string | |
114 | * @size: size of @buf, in bytes | |
1f8fef7b | 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 | ||
fe43d6d9 | 130 | static void get_ids(const u32 *directory, int *id) |
19a15b93 KH |
131 | { |
132 | struct fw_csr_iterator ci; | |
fe43d6d9 | 133 | int key, value; |
19a15b93 | 134 | |
19a15b93 KH |
135 | fw_csr_iterator_init(&ci, directory); |
136 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
fe43d6d9 SR |
137 | switch (key) { |
138 | case CSR_VENDOR: id[0] = value; break; | |
139 | case CSR_MODEL: id[1] = value; break; | |
140 | case CSR_SPECIFIER_ID: id[2] = value; break; | |
141 | case CSR_VERSION: id[3] = value; break; | |
142 | } | |
19a15b93 | 143 | } |
fe43d6d9 | 144 | } |
19a15b93 | 145 | |
fe43d6d9 SR |
146 | static void get_modalias_ids(struct fw_unit *unit, int *id) |
147 | { | |
148 | get_ids(&fw_parent_device(unit)->config_rom[5], id); | |
149 | get_ids(unit->directory, id); | |
150 | } | |
19a15b93 | 151 | |
fe43d6d9 SR |
152 | static bool match_ids(const struct ieee1394_device_id *id_table, int *id) |
153 | { | |
154 | int match = 0; | |
155 | ||
156 | if (id[0] == id_table->vendor_id) | |
157 | match |= IEEE1394_MATCH_VENDOR_ID; | |
158 | if (id[1] == id_table->model_id) | |
159 | match |= IEEE1394_MATCH_MODEL_ID; | |
160 | if (id[2] == id_table->specifier_id) | |
161 | match |= IEEE1394_MATCH_SPECIFIER_ID; | |
162 | if (id[3] == id_table->version) | |
163 | match |= IEEE1394_MATCH_VERSION; | |
164 | ||
165 | return (match & id_table->match_flags) == id_table->match_flags; | |
19a15b93 KH |
166 | } |
167 | ||
fe43d6d9 SR |
168 | static bool is_fw_unit(struct device *dev); |
169 | ||
19a15b93 KH |
170 | static int fw_unit_match(struct device *dev, struct device_driver *drv) |
171 | { | |
fe43d6d9 SR |
172 | const struct ieee1394_device_id *id_table = |
173 | container_of(drv, struct fw_driver, driver)->id_table; | |
174 | int id[] = {0, 0, 0, 0}; | |
19a15b93 KH |
175 | |
176 | /* We only allow binding to fw_units. */ | |
177 | if (!is_fw_unit(dev)) | |
178 | return 0; | |
179 | ||
fe43d6d9 | 180 | get_modalias_ids(fw_unit(dev), id); |
e41f8d70 | 181 | |
fe43d6d9 SR |
182 | for (; id_table->match_flags != 0; id_table++) |
183 | if (match_ids(id_table, id)) | |
19a15b93 | 184 | return 1; |
19a15b93 KH |
185 | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
190 | { | |
5ae73518 | 191 | int id[] = {0, 0, 0, 0}; |
19a15b93 | 192 | |
fe43d6d9 | 193 | get_modalias_ids(unit, id); |
19a15b93 KH |
194 | |
195 | return snprintf(buffer, buffer_size, | |
196 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
5ae73518 | 197 | id[0], id[1], id[2], id[3]); |
19a15b93 KH |
198 | } |
199 | ||
53dca511 | 200 | static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
201 | { |
202 | struct fw_unit *unit = fw_unit(dev); | |
203 | char modalias[64]; | |
19a15b93 | 204 | |
2d826cc5 | 205 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 206 | |
7eff2e7a | 207 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
208 | return -ENOMEM; |
209 | ||
19a15b93 KH |
210 | return 0; |
211 | } | |
212 | ||
213 | struct bus_type fw_bus_type = { | |
362c2c8c | 214 | .name = "firewire", |
19a15b93 | 215 | .match = fw_unit_match, |
19a15b93 | 216 | }; |
19a15b93 KH |
217 | EXPORT_SYMBOL(fw_bus_type); |
218 | ||
19a15b93 KH |
219 | int fw_device_enable_phys_dma(struct fw_device *device) |
220 | { | |
b5d2a5e0 SR |
221 | int generation = device->generation; |
222 | ||
223 | /* device->node_id, accessed below, must not be older than generation */ | |
224 | smp_rmb(); | |
225 | ||
19a15b93 KH |
226 | return device->card->driver->enable_phys_dma(device->card, |
227 | device->node_id, | |
b5d2a5e0 | 228 | generation); |
19a15b93 | 229 | } |
19a15b93 KH |
230 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
231 | ||
7feb9cce KH |
232 | struct config_rom_attribute { |
233 | struct device_attribute attr; | |
234 | u32 key; | |
235 | }; | |
236 | ||
53dca511 SR |
237 | static ssize_t show_immediate(struct device *dev, |
238 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
239 | { |
240 | struct config_rom_attribute *attr = | |
241 | container_of(dattr, struct config_rom_attribute, attr); | |
242 | struct fw_csr_iterator ci; | |
13b302d0 | 243 | const u32 *dir; |
c9755e14 SR |
244 | int key, value, ret = -ENOENT; |
245 | ||
246 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
247 | |
248 | if (is_fw_unit(dev)) | |
249 | dir = fw_unit(dev)->directory; | |
250 | else | |
251 | dir = fw_device(dev)->config_rom + 5; | |
252 | ||
253 | fw_csr_iterator_init(&ci, dir); | |
254 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
255 | if (attr->key == key) { |
256 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
257 | "0x%06x\n", value); | |
258 | break; | |
259 | } | |
260 | ||
261 | up_read(&fw_device_rwsem); | |
7feb9cce | 262 | |
c9755e14 | 263 | return ret; |
7feb9cce KH |
264 | } |
265 | ||
266 | #define IMMEDIATE_ATTR(name, key) \ | |
267 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
268 | ||
53dca511 SR |
269 | static ssize_t show_text_leaf(struct device *dev, |
270 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
271 | { |
272 | struct config_rom_attribute *attr = | |
273 | container_of(dattr, struct config_rom_attribute, attr); | |
13b302d0 | 274 | const u32 *dir; |
1f8fef7b CL |
275 | size_t bufsize; |
276 | char dummy_buf[2]; | |
277 | int ret; | |
7feb9cce | 278 | |
c9755e14 SR |
279 | down_read(&fw_device_rwsem); |
280 | ||
7feb9cce KH |
281 | if (is_fw_unit(dev)) |
282 | dir = fw_unit(dev)->directory; | |
283 | else | |
284 | dir = fw_device(dev)->config_rom + 5; | |
285 | ||
1f8fef7b CL |
286 | if (buf) { |
287 | bufsize = PAGE_SIZE - 1; | |
288 | } else { | |
289 | buf = dummy_buf; | |
290 | bufsize = 1; | |
7feb9cce KH |
291 | } |
292 | ||
1f8fef7b | 293 | ret = fw_csr_string(dir, attr->key, buf, bufsize); |
7feb9cce | 294 | |
1f8fef7b CL |
295 | if (ret >= 0) { |
296 | /* Strip trailing whitespace and add newline. */ | |
297 | while (ret > 0 && isspace(buf[ret - 1])) | |
298 | ret--; | |
299 | strcpy(buf + ret, "\n"); | |
300 | ret++; | |
c9755e14 | 301 | } |
7feb9cce | 302 | |
c9755e14 | 303 | up_read(&fw_device_rwsem); |
7feb9cce | 304 | |
c9755e14 | 305 | return ret; |
7feb9cce KH |
306 | } |
307 | ||
308 | #define TEXT_LEAF_ATTR(name, key) \ | |
309 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
310 | ||
311 | static struct config_rom_attribute config_rom_attributes[] = { | |
312 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
313 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
314 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
315 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
316 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
317 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
318 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
319 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
320 | }; | |
321 | ||
53dca511 SR |
322 | static void init_fw_attribute_group(struct device *dev, |
323 | struct device_attribute *attrs, | |
324 | struct fw_attribute_group *group) | |
7feb9cce KH |
325 | { |
326 | struct device_attribute *attr; | |
6f2e53d5 KH |
327 | int i, j; |
328 | ||
329 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
330 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
331 | |
332 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
333 | attr = &config_rom_attributes[i].attr; | |
334 | if (attr->show(dev, attr, NULL) < 0) | |
335 | continue; | |
6f2e53d5 | 336 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
337 | } |
338 | ||
e5333db9 | 339 | group->attrs[j] = NULL; |
6f2e53d5 KH |
340 | group->groups[0] = &group->group; |
341 | group->groups[1] = NULL; | |
342 | group->group.attrs = group->attrs; | |
a4dbd674 | 343 | dev->groups = (const struct attribute_group **) group->groups; |
7feb9cce KH |
344 | } |
345 | ||
53dca511 SR |
346 | static ssize_t modalias_show(struct device *dev, |
347 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
348 | { |
349 | struct fw_unit *unit = fw_unit(dev); | |
350 | int length; | |
351 | ||
352 | length = get_modalias(unit, buf, PAGE_SIZE); | |
353 | strcpy(buf + length, "\n"); | |
354 | ||
355 | return length + 1; | |
356 | } | |
357 | ||
53dca511 SR |
358 | static ssize_t rom_index_show(struct device *dev, |
359 | struct device_attribute *attr, char *buf) | |
19a15b93 | 360 | { |
21351dbe KH |
361 | struct fw_device *device = fw_device(dev->parent); |
362 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 363 | |
21351dbe KH |
364 | return snprintf(buf, PAGE_SIZE, "%d\n", |
365 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
366 | } |
367 | ||
21351dbe KH |
368 | static struct device_attribute fw_unit_attributes[] = { |
369 | __ATTR_RO(modalias), | |
370 | __ATTR_RO(rom_index), | |
371 | __ATTR_NULL, | |
19a15b93 KH |
372 | }; |
373 | ||
53dca511 SR |
374 | static ssize_t config_rom_show(struct device *dev, |
375 | struct device_attribute *attr, char *buf) | |
048961ef | 376 | { |
21351dbe | 377 | struct fw_device *device = fw_device(dev); |
c9755e14 | 378 | size_t length; |
048961ef | 379 | |
c9755e14 SR |
380 | down_read(&fw_device_rwsem); |
381 | length = device->config_rom_length * 4; | |
382 | memcpy(buf, device->config_rom, length); | |
383 | up_read(&fw_device_rwsem); | |
21351dbe | 384 | |
c9755e14 | 385 | return length; |
048961ef KH |
386 | } |
387 | ||
53dca511 SR |
388 | static ssize_t guid_show(struct device *dev, |
389 | struct device_attribute *attr, char *buf) | |
bbd14945 KH |
390 | { |
391 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
392 | int ret; |
393 | ||
394 | down_read(&fw_device_rwsem); | |
395 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
396 | device->config_rom[3], device->config_rom[4]); | |
397 | up_read(&fw_device_rwsem); | |
bbd14945 | 398 | |
c9755e14 | 399 | return ret; |
bbd14945 KH |
400 | } |
401 | ||
13b302d0 | 402 | static int units_sprintf(char *buf, const u32 *directory) |
0210b66d SR |
403 | { |
404 | struct fw_csr_iterator ci; | |
405 | int key, value; | |
406 | int specifier_id = 0; | |
407 | int version = 0; | |
408 | ||
409 | fw_csr_iterator_init(&ci, directory); | |
410 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
411 | switch (key) { | |
412 | case CSR_SPECIFIER_ID: | |
413 | specifier_id = value; | |
414 | break; | |
415 | case CSR_VERSION: | |
416 | version = value; | |
417 | break; | |
418 | } | |
419 | } | |
420 | ||
421 | return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version); | |
422 | } | |
423 | ||
424 | static ssize_t units_show(struct device *dev, | |
425 | struct device_attribute *attr, char *buf) | |
426 | { | |
427 | struct fw_device *device = fw_device(dev); | |
428 | struct fw_csr_iterator ci; | |
429 | int key, value, i = 0; | |
430 | ||
431 | down_read(&fw_device_rwsem); | |
432 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
433 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
434 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
435 | continue; | |
436 | i += units_sprintf(&buf[i], ci.p + value - 1); | |
437 | if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) | |
438 | break; | |
439 | } | |
440 | up_read(&fw_device_rwsem); | |
441 | ||
442 | if (i) | |
443 | buf[i - 1] = '\n'; | |
444 | ||
445 | return i; | |
446 | } | |
447 | ||
21351dbe KH |
448 | static struct device_attribute fw_device_attributes[] = { |
449 | __ATTR_RO(config_rom), | |
bbd14945 | 450 | __ATTR_RO(guid), |
0210b66d | 451 | __ATTR_RO(units), |
21351dbe | 452 | __ATTR_NULL, |
048961ef KH |
453 | }; |
454 | ||
53dca511 SR |
455 | static int read_rom(struct fw_device *device, |
456 | int generation, int index, u32 *data) | |
19a15b93 | 457 | { |
1e119fa9 | 458 | int rcode; |
b5d2a5e0 SR |
459 | |
460 | /* device->node_id, accessed below, must not be older than generation */ | |
461 | smp_rmb(); | |
19a15b93 | 462 | |
1e119fa9 | 463 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 464 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
465 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
466 | data, 4); | |
467 | be32_to_cpus(data); | |
19a15b93 | 468 | |
1e119fa9 | 469 | return rcode; |
19a15b93 KH |
470 | } |
471 | ||
fd6e0c51 | 472 | #define MAX_CONFIG_ROM_SIZE 256 |
1dadff71 | 473 | |
f8d2dc39 SR |
474 | /* |
475 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
476 | * the config ROM. We do all this with a cached bus generation. If the bus | |
fd6e0c51 | 477 | * generation changes under us, read_config_rom will fail and get retried. |
f8d2dc39 SR |
478 | * It's better to start all over in this case because the node from which we |
479 | * are reading the ROM may have changed the ROM during the reset. | |
480 | */ | |
fd6e0c51 | 481 | static int read_config_rom(struct fw_device *device, int generation) |
19a15b93 | 482 | { |
13b302d0 SR |
483 | const u32 *old_rom, *new_rom; |
484 | u32 *rom, *stack; | |
1dadff71 SR |
485 | u32 sp, key; |
486 | int i, end, length, ret = -1; | |
487 | ||
fd6e0c51 SR |
488 | rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE + |
489 | sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL); | |
1dadff71 SR |
490 | if (rom == NULL) |
491 | return -ENOMEM; | |
492 | ||
fd6e0c51 SR |
493 | stack = &rom[MAX_CONFIG_ROM_SIZE]; |
494 | memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE); | |
19a15b93 | 495 | |
f1397490 SR |
496 | device->max_speed = SCODE_100; |
497 | ||
19a15b93 KH |
498 | /* First read the bus info block. */ |
499 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 500 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 501 | goto out; |
c781c06d KH |
502 | /* |
503 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
504 | * reply with a 0 for the first quadlet of the config |
505 | * rom to indicate that they are booting (for example, | |
506 | * if the firmware is on the disk of a external | |
507 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
508 | * retry mechanism will try again later. |
509 | */ | |
19a15b93 | 510 | if (i == 0 && rom[i] == 0) |
1dadff71 | 511 | goto out; |
19a15b93 KH |
512 | } |
513 | ||
f1397490 SR |
514 | device->max_speed = device->node->max_speed; |
515 | ||
516 | /* | |
517 | * Determine the speed of | |
518 | * - devices with link speed less than PHY speed, | |
519 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
520 | * - all devices if there are 1394b repeaters. | |
521 | * Note, we cannot use the bus info block's link_spd as starting point | |
522 | * because some buggy firmwares set it lower than necessary and because | |
523 | * 1394-1995 nodes do not have the field. | |
524 | */ | |
525 | if ((rom[2] & 0x7) < device->max_speed || | |
526 | device->max_speed == SCODE_BETA || | |
527 | device->card->beta_repeaters_present) { | |
528 | u32 dummy; | |
529 | ||
530 | /* for S1600 and S3200 */ | |
531 | if (device->max_speed == SCODE_BETA) | |
532 | device->max_speed = device->card->link_speed; | |
533 | ||
534 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
535 | if (read_rom(device, generation, 0, &dummy) == |
536 | RCODE_COMPLETE) | |
f1397490 SR |
537 | break; |
538 | device->max_speed--; | |
539 | } | |
540 | } | |
541 | ||
c781c06d KH |
542 | /* |
543 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
544 | * directory structure so we parse it using a stack of |
545 | * references to the blocks that make up the structure. We | |
546 | * push a reference to the root directory on the stack to | |
c781c06d KH |
547 | * start things off. |
548 | */ | |
19a15b93 KH |
549 | length = i; |
550 | sp = 0; | |
551 | stack[sp++] = 0xc0000005; | |
552 | while (sp > 0) { | |
c781c06d KH |
553 | /* |
554 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
555 | * lower 24 bits is the offset into the config rom, |
556 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
557 | * block. |
558 | */ | |
19a15b93 KH |
559 | key = stack[--sp]; |
560 | i = key & 0xffffff; | |
fd6e0c51 | 561 | if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) |
1dadff71 | 562 | goto out; |
19a15b93 KH |
563 | |
564 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 565 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 566 | goto out; |
19a15b93 | 567 | end = i + (rom[i] >> 16) + 1; |
fd6e0c51 | 568 | if (end > MAX_CONFIG_ROM_SIZE) { |
c781c06d | 569 | /* |
2799d5c5 SR |
570 | * This block extends outside the config ROM which is |
571 | * a firmware bug. Ignore this whole block, i.e. | |
572 | * simply set a fake block length of 0. | |
c781c06d | 573 | */ |
2799d5c5 SR |
574 | fw_error("skipped invalid ROM block %x at %llx\n", |
575 | rom[i], | |
576 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); | |
577 | rom[i] = 0; | |
578 | end = i; | |
579 | } | |
580 | i++; | |
19a15b93 | 581 | |
c781c06d KH |
582 | /* |
583 | * Now read in the block. If this is a directory | |
19a15b93 | 584 | * block, check the entries as we read them to see if |
c781c06d KH |
585 | * it references another block, and push it in that case. |
586 | */ | |
d54423c6 | 587 | for (; i < end; i++) { |
f8d2dc39 SR |
588 | if (read_rom(device, generation, i, &rom[i]) != |
589 | RCODE_COMPLETE) | |
1dadff71 | 590 | goto out; |
d54423c6 | 591 | |
58aaa542 | 592 | if ((key >> 30) != 3 || (rom[i] >> 30) < 2) |
d54423c6 SR |
593 | continue; |
594 | /* | |
595 | * Offset points outside the ROM. May be a firmware | |
596 | * bug or an Extended ROM entry (IEEE 1212-2001 clause | |
597 | * 7.7.18). Simply overwrite this pointer here by a | |
598 | * fake immediate entry so that later iterators over | |
599 | * the ROM don't have to check offsets all the time. | |
600 | */ | |
fd6e0c51 | 601 | if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) { |
d54423c6 SR |
602 | fw_error("skipped unsupported ROM entry %x at %llx\n", |
603 | rom[i], | |
604 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); | |
605 | rom[i] = 0; | |
606 | continue; | |
607 | } | |
608 | stack[sp++] = i + rom[i]; | |
19a15b93 KH |
609 | } |
610 | if (length < i) | |
611 | length = i; | |
612 | } | |
613 | ||
c9755e14 SR |
614 | old_rom = device->config_rom; |
615 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
616 | if (new_rom == NULL) | |
1dadff71 | 617 | goto out; |
c9755e14 SR |
618 | |
619 | down_write(&fw_device_rwsem); | |
620 | device->config_rom = new_rom; | |
19a15b93 | 621 | device->config_rom_length = length; |
c9755e14 SR |
622 | up_write(&fw_device_rwsem); |
623 | ||
624 | kfree(old_rom); | |
1dadff71 | 625 | ret = 0; |
837ec787 SR |
626 | device->max_rec = rom[2] >> 12 & 0xf; |
627 | device->cmc = rom[2] >> 30 & 1; | |
628 | device->irmc = rom[2] >> 31 & 1; | |
1dadff71 SR |
629 | out: |
630 | kfree(rom); | |
19a15b93 | 631 | |
1dadff71 | 632 | return ret; |
19a15b93 KH |
633 | } |
634 | ||
635 | static void fw_unit_release(struct device *dev) | |
636 | { | |
637 | struct fw_unit *unit = fw_unit(dev); | |
638 | ||
639 | kfree(unit); | |
640 | } | |
641 | ||
21351dbe | 642 | static struct device_type fw_unit_type = { |
21351dbe KH |
643 | .uevent = fw_unit_uevent, |
644 | .release = fw_unit_release, | |
645 | }; | |
646 | ||
099d5414 | 647 | static bool is_fw_unit(struct device *dev) |
19a15b93 | 648 | { |
21351dbe | 649 | return dev->type == &fw_unit_type; |
19a15b93 KH |
650 | } |
651 | ||
652 | static void create_units(struct fw_device *device) | |
653 | { | |
654 | struct fw_csr_iterator ci; | |
655 | struct fw_unit *unit; | |
656 | int key, value, i; | |
657 | ||
658 | i = 0; | |
659 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
660 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
661 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
662 | continue; | |
663 | ||
c781c06d KH |
664 | /* |
665 | * Get the address of the unit directory and try to | |
666 | * match the drivers id_tables against it. | |
667 | */ | |
2d826cc5 | 668 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
669 | if (unit == NULL) { |
670 | fw_error("failed to allocate memory for unit\n"); | |
671 | continue; | |
672 | } | |
673 | ||
674 | unit->directory = ci.p + value - 1; | |
675 | unit->device.bus = &fw_bus_type; | |
21351dbe | 676 | unit->device.type = &fw_unit_type; |
19a15b93 | 677 | unit->device.parent = &device->device; |
a1f64819 | 678 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 679 | |
e5333db9 SR |
680 | BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) < |
681 | ARRAY_SIZE(fw_unit_attributes) + | |
682 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
683 | init_fw_attribute_group(&unit->device, |
684 | fw_unit_attributes, | |
685 | &unit->attribute_group); | |
e5333db9 | 686 | |
7feb9cce KH |
687 | if (device_register(&unit->device) < 0) |
688 | goto skip_unit; | |
689 | ||
7feb9cce KH |
690 | continue; |
691 | ||
7feb9cce KH |
692 | skip_unit: |
693 | kfree(unit); | |
19a15b93 KH |
694 | } |
695 | } | |
696 | ||
697 | static int shutdown_unit(struct device *device, void *data) | |
698 | { | |
21351dbe | 699 | device_unregister(device); |
19a15b93 KH |
700 | |
701 | return 0; | |
702 | } | |
703 | ||
c9755e14 SR |
704 | /* |
705 | * fw_device_rwsem acts as dual purpose mutex: | |
706 | * - serializes accesses to fw_device_idr, | |
707 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
708 | * fw_unit.directory, unless those accesses happen at safe occasions | |
709 | */ | |
710 | DECLARE_RWSEM(fw_device_rwsem); | |
711 | ||
d6053e08 | 712 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
713 | int fw_cdev_major; |
714 | ||
96b19062 | 715 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
716 | { |
717 | struct fw_device *device; | |
718 | ||
c9755e14 | 719 | down_read(&fw_device_rwsem); |
a3aca3da | 720 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
721 | if (device) |
722 | fw_device_get(device); | |
c9755e14 | 723 | up_read(&fw_device_rwsem); |
a3aca3da KH |
724 | |
725 | return device; | |
726 | } | |
727 | ||
105e53f8 SR |
728 | struct workqueue_struct *fw_workqueue; |
729 | EXPORT_SYMBOL(fw_workqueue); | |
6ea9e7bb SR |
730 | |
731 | static void fw_schedule_device_work(struct fw_device *device, | |
732 | unsigned long delay) | |
733 | { | |
105e53f8 | 734 | queue_delayed_work(fw_workqueue, &device->work, delay); |
6ea9e7bb SR |
735 | } |
736 | ||
3d36a0df SR |
737 | /* |
738 | * These defines control the retry behavior for reading the config | |
739 | * rom. It shouldn't be necessary to tweak these; if the device | |
740 | * doesn't respond to a config rom read within 10 seconds, it's not | |
741 | * going to respond at all. As for the initial delay, a lot of | |
742 | * devices will be able to respond within half a second after bus | |
743 | * reset. On the other hand, it's not really worth being more | |
744 | * aggressive than that, since it scales pretty well; if 10 devices | |
745 | * are plugged in, they're all getting read within one second. | |
746 | */ | |
747 | ||
748 | #define MAX_RETRIES 10 | |
749 | #define RETRY_DELAY (3 * HZ) | |
750 | #define INITIAL_DELAY (HZ / 2) | |
751 | #define SHUTDOWN_DELAY (2 * HZ) | |
752 | ||
19a15b93 KH |
753 | static void fw_device_shutdown(struct work_struct *work) |
754 | { | |
755 | struct fw_device *device = | |
756 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
757 | int minor = MINOR(device->device.devt); |
758 | ||
e71084af CL |
759 | if (time_before64(get_jiffies_64(), |
760 | device->card->reset_jiffies + SHUTDOWN_DELAY) | |
e747a5c0 | 761 | && !list_empty(&device->card->link)) { |
6ea9e7bb | 762 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
3d36a0df SR |
763 | return; |
764 | } | |
765 | ||
766 | if (atomic_cmpxchg(&device->state, | |
767 | FW_DEVICE_GONE, | |
768 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
769 | return; | |
770 | ||
2603bf21 | 771 | fw_device_cdev_remove(device); |
19a15b93 KH |
772 | device_for_each_child(&device->device, NULL, shutdown_unit); |
773 | device_unregister(&device->device); | |
96b19062 | 774 | |
c9755e14 | 775 | down_write(&fw_device_rwsem); |
96b19062 | 776 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 777 | up_write(&fw_device_rwsem); |
3d36a0df | 778 | |
96b19062 | 779 | fw_device_put(device); |
19a15b93 KH |
780 | } |
781 | ||
aed80892 SR |
782 | static void fw_device_release(struct device *dev) |
783 | { | |
784 | struct fw_device *device = fw_device(dev); | |
785 | struct fw_card *card = device->card; | |
786 | unsigned long flags; | |
787 | ||
788 | /* | |
789 | * Take the card lock so we don't set this to NULL while a | |
790 | * FW_NODE_UPDATED callback is being handled or while the | |
791 | * bus manager work looks at this node. | |
792 | */ | |
793 | spin_lock_irqsave(&card->lock, flags); | |
794 | device->node->data = NULL; | |
795 | spin_unlock_irqrestore(&card->lock, flags); | |
796 | ||
797 | fw_node_put(device->node); | |
798 | kfree(device->config_rom); | |
799 | kfree(device); | |
800 | fw_card_put(card); | |
801 | } | |
802 | ||
21351dbe | 803 | static struct device_type fw_device_type = { |
aed80892 | 804 | .release = fw_device_release, |
21351dbe KH |
805 | }; |
806 | ||
099d5414 SR |
807 | static bool is_fw_device(struct device *dev) |
808 | { | |
809 | return dev->type == &fw_device_type; | |
810 | } | |
811 | ||
aed80892 SR |
812 | static int update_unit(struct device *dev, void *data) |
813 | { | |
814 | struct fw_unit *unit = fw_unit(dev); | |
815 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
816 | ||
817 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { | |
8e9394ce | 818 | device_lock(dev); |
aed80892 | 819 | driver->update(unit); |
8e9394ce | 820 | device_unlock(dev); |
aed80892 SR |
821 | } |
822 | ||
823 | return 0; | |
824 | } | |
825 | ||
826 | static void fw_device_update(struct work_struct *work) | |
827 | { | |
828 | struct fw_device *device = | |
829 | container_of(work, struct fw_device, work.work); | |
830 | ||
831 | fw_device_cdev_update(device); | |
832 | device_for_each_child(&device->device, NULL, update_unit); | |
833 | } | |
3d36a0df | 834 | |
c781c06d | 835 | /* |
3d36a0df SR |
836 | * If a device was pending for deletion because its node went away but its |
837 | * bus info block and root directory header matches that of a newly discovered | |
838 | * device, revive the existing fw_device. | |
839 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 840 | */ |
3d36a0df SR |
841 | static int lookup_existing_device(struct device *dev, void *data) |
842 | { | |
843 | struct fw_device *old = fw_device(dev); | |
844 | struct fw_device *new = data; | |
845 | struct fw_card *card = new->card; | |
846 | int match = 0; | |
847 | ||
099d5414 SR |
848 | if (!is_fw_device(dev)) |
849 | return 0; | |
850 | ||
3d36a0df SR |
851 | down_read(&fw_device_rwsem); /* serialize config_rom access */ |
852 | spin_lock_irq(&card->lock); /* serialize node access */ | |
853 | ||
854 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
855 | atomic_cmpxchg(&old->state, | |
856 | FW_DEVICE_GONE, | |
857 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
858 | struct fw_node *current_node = new->node; | |
859 | struct fw_node *obsolete_node = old->node; | |
860 | ||
861 | new->node = obsolete_node; | |
862 | new->node->data = new; | |
863 | old->node = current_node; | |
864 | old->node->data = old; | |
865 | ||
866 | old->max_speed = new->max_speed; | |
867 | old->node_id = current_node->node_id; | |
868 | smp_wmb(); /* update node_id before generation */ | |
869 | old->generation = card->generation; | |
870 | old->config_rom_retries = 0; | |
871 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 872 | |
3d36a0df | 873 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
6ea9e7bb | 874 | fw_schedule_device_work(old, 0); |
3d36a0df SR |
875 | |
876 | if (current_node == card->root_node) | |
877 | fw_schedule_bm_work(card, 0); | |
878 | ||
879 | match = 1; | |
880 | } | |
881 | ||
882 | spin_unlock_irq(&card->lock); | |
883 | up_read(&fw_device_rwsem); | |
884 | ||
885 | return match; | |
886 | } | |
19a15b93 | 887 | |
7889b60e SR |
888 | enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; |
889 | ||
099d5414 | 890 | static void set_broadcast_channel(struct fw_device *device, int generation) |
7889b60e SR |
891 | { |
892 | struct fw_card *card = device->card; | |
893 | __be32 data; | |
894 | int rcode; | |
895 | ||
896 | if (!card->broadcast_channel_allocated) | |
897 | return; | |
898 | ||
837ec787 SR |
899 | /* |
900 | * The Broadcast_Channel Valid bit is required by nodes which want to | |
901 | * transmit on this channel. Such transmissions are practically | |
902 | * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required | |
903 | * to be IRM capable and have a max_rec of 8 or more. We use this fact | |
904 | * to narrow down to which nodes we send Broadcast_Channel updates. | |
905 | */ | |
906 | if (!device->irmc || device->max_rec < 8) | |
907 | return; | |
908 | ||
909 | /* | |
910 | * Some 1394-1995 nodes crash if this 1394a-2000 register is written. | |
911 | * Perform a read test first. | |
912 | */ | |
7889b60e SR |
913 | if (device->bc_implemented == BC_UNKNOWN) { |
914 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, | |
915 | device->node_id, generation, device->max_speed, | |
916 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
917 | &data, 4); | |
918 | switch (rcode) { | |
919 | case RCODE_COMPLETE: | |
920 | if (data & cpu_to_be32(1 << 31)) { | |
921 | device->bc_implemented = BC_IMPLEMENTED; | |
922 | break; | |
923 | } | |
924 | /* else fall through to case address error */ | |
925 | case RCODE_ADDRESS_ERROR: | |
926 | device->bc_implemented = BC_UNIMPLEMENTED; | |
927 | } | |
928 | } | |
929 | ||
930 | if (device->bc_implemented == BC_IMPLEMENTED) { | |
931 | data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | | |
932 | BROADCAST_CHANNEL_VALID); | |
933 | fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, | |
934 | device->node_id, generation, device->max_speed, | |
935 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
936 | &data, 4); | |
937 | } | |
938 | } | |
939 | ||
099d5414 SR |
940 | int fw_device_set_broadcast_channel(struct device *dev, void *gen) |
941 | { | |
942 | if (is_fw_device(dev)) | |
943 | set_broadcast_channel(fw_device(dev), (long)gen); | |
944 | ||
945 | return 0; | |
946 | } | |
947 | ||
19a15b93 KH |
948 | static void fw_device_init(struct work_struct *work) |
949 | { | |
19a15b93 KH |
950 | struct fw_device *device = |
951 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 952 | struct device *revived_dev; |
e1eff7a3 | 953 | int minor, ret; |
19a15b93 | 954 | |
c781c06d KH |
955 | /* |
956 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 957 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
958 | * device. |
959 | */ | |
19a15b93 | 960 | |
fd6e0c51 | 961 | if (read_config_rom(device, device->generation) < 0) { |
855c603d SR |
962 | if (device->config_rom_retries < MAX_RETRIES && |
963 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 | 964 | device->config_rom_retries++; |
6ea9e7bb | 965 | fw_schedule_device_work(device, RETRY_DELAY); |
19a15b93 | 966 | } else { |
115881d3 SR |
967 | if (device->node->link_on) |
968 | fw_notify("giving up on config rom for node id %x\n", | |
969 | device->node_id); | |
931c4834 | 970 | if (device->node == device->card->root_node) |
0fa1986f | 971 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
972 | fw_device_release(&device->device); |
973 | } | |
974 | return; | |
975 | } | |
976 | ||
3d36a0df SR |
977 | revived_dev = device_find_child(device->card->device, |
978 | device, lookup_existing_device); | |
979 | if (revived_dev) { | |
980 | put_device(revived_dev); | |
981 | fw_device_release(&device->device); | |
982 | ||
983 | return; | |
984 | } | |
985 | ||
62305823 | 986 | device_initialize(&device->device); |
96b19062 SR |
987 | |
988 | fw_device_get(device); | |
c9755e14 | 989 | down_write(&fw_device_rwsem); |
e1eff7a3 | 990 | ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
62305823 SR |
991 | idr_get_new(&fw_device_idr, device, &minor) : |
992 | -ENOMEM; | |
c9755e14 | 993 | up_write(&fw_device_rwsem); |
96b19062 | 994 | |
e1eff7a3 | 995 | if (ret < 0) |
a3aca3da KH |
996 | goto error; |
997 | ||
19a15b93 | 998 | device->device.bus = &fw_bus_type; |
21351dbe | 999 | device->device.type = &fw_device_type; |
19a15b93 | 1000 | device->device.parent = device->card->device; |
a3aca3da | 1001 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 1002 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 1003 | |
e5333db9 SR |
1004 | BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) < |
1005 | ARRAY_SIZE(fw_device_attributes) + | |
1006 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
1007 | init_fw_attribute_group(&device->device, |
1008 | fw_device_attributes, | |
1009 | &device->attribute_group); | |
e5333db9 | 1010 | |
19a15b93 KH |
1011 | if (device_add(&device->device)) { |
1012 | fw_error("Failed to add device.\n"); | |
a3aca3da | 1013 | goto error_with_cdev; |
19a15b93 KH |
1014 | } |
1015 | ||
19a15b93 KH |
1016 | create_units(device); |
1017 | ||
c781c06d KH |
1018 | /* |
1019 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
1020 | * out from under us while we did the intialization work, we |
1021 | * have to shut down the device again here. Normally, though, | |
1022 | * fw_node_event will be responsible for shutting it down when | |
1023 | * necessary. We have to use the atomic cmpxchg here to avoid | |
1024 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
1025 | * fw_node_event(). |
1026 | */ | |
641f8791 | 1027 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1028 | FW_DEVICE_INITIALIZING, |
1029 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
1030 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
6ea9e7bb | 1031 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
fa6e697b SR |
1032 | } else { |
1033 | if (device->config_rom_retries) | |
1034 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
1035 | "%d config ROM retries\n", | |
a1f64819 | 1036 | dev_name(&device->device), |
fa6e697b SR |
1037 | device->config_rom[3], device->config_rom[4], |
1038 | 1 << device->max_speed, | |
1039 | device->config_rom_retries); | |
1040 | else | |
1041 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 1042 | dev_name(&device->device), |
fa6e697b SR |
1043 | device->config_rom[3], device->config_rom[4], |
1044 | 1 << device->max_speed); | |
c9755e14 | 1045 | device->config_rom_retries = 0; |
7889b60e | 1046 | |
099d5414 | 1047 | set_broadcast_channel(device, device->generation); |
fa6e697b | 1048 | } |
19a15b93 | 1049 | |
c781c06d KH |
1050 | /* |
1051 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
1052 | * root node config rom. If this races with a bus reset we |
1053 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
1054 | * pretty harmless. |
1055 | */ | |
19a15b93 | 1056 | if (device->node == device->card->root_node) |
0fa1986f | 1057 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
1058 | |
1059 | return; | |
1060 | ||
a3aca3da | 1061 | error_with_cdev: |
c9755e14 | 1062 | down_write(&fw_device_rwsem); |
a3aca3da | 1063 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 1064 | up_write(&fw_device_rwsem); |
373b2edd | 1065 | error: |
96b19062 SR |
1066 | fw_device_put(device); /* fw_device_idr's reference */ |
1067 | ||
1068 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
1069 | } |
1070 | ||
c9755e14 SR |
1071 | enum { |
1072 | REREAD_BIB_ERROR, | |
1073 | REREAD_BIB_GONE, | |
1074 | REREAD_BIB_UNCHANGED, | |
1075 | REREAD_BIB_CHANGED, | |
1076 | }; | |
1077 | ||
1078 | /* Reread and compare bus info block and header of root directory */ | |
fd6e0c51 | 1079 | static int reread_config_rom(struct fw_device *device, int generation) |
c9755e14 SR |
1080 | { |
1081 | u32 q; | |
1082 | int i; | |
1083 | ||
1084 | for (i = 0; i < 6; i++) { | |
1085 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
1086 | return REREAD_BIB_ERROR; | |
1087 | ||
1088 | if (i == 0 && q == 0) | |
1089 | return REREAD_BIB_GONE; | |
1090 | ||
d01b0178 | 1091 | if (q != device->config_rom[i]) |
c9755e14 SR |
1092 | return REREAD_BIB_CHANGED; |
1093 | } | |
1094 | ||
1095 | return REREAD_BIB_UNCHANGED; | |
1096 | } | |
1097 | ||
1098 | static void fw_device_refresh(struct work_struct *work) | |
1099 | { | |
1100 | struct fw_device *device = | |
1101 | container_of(work, struct fw_device, work.work); | |
1102 | struct fw_card *card = device->card; | |
1103 | int node_id = device->node_id; | |
1104 | ||
fd6e0c51 | 1105 | switch (reread_config_rom(device, device->generation)) { |
c9755e14 SR |
1106 | case REREAD_BIB_ERROR: |
1107 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
1108 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1109 | device->config_rom_retries++; | |
6ea9e7bb | 1110 | fw_schedule_device_work(device, RETRY_DELAY / 2); |
c9755e14 SR |
1111 | |
1112 | return; | |
1113 | } | |
1114 | goto give_up; | |
1115 | ||
1116 | case REREAD_BIB_GONE: | |
1117 | goto gone; | |
1118 | ||
1119 | case REREAD_BIB_UNCHANGED: | |
1120 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
1121 | FW_DEVICE_INITIALIZING, |
1122 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1123 | goto gone; |
1124 | ||
1125 | fw_device_update(work); | |
1126 | device->config_rom_retries = 0; | |
1127 | goto out; | |
1128 | ||
1129 | case REREAD_BIB_CHANGED: | |
1130 | break; | |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | * Something changed. We keep things simple and don't investigate | |
1135 | * further. We just destroy all previous units and create new ones. | |
1136 | */ | |
1137 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
1138 | ||
fd6e0c51 | 1139 | if (read_config_rom(device, device->generation) < 0) { |
c9755e14 SR |
1140 | if (device->config_rom_retries < MAX_RETRIES && |
1141 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1142 | device->config_rom_retries++; | |
6ea9e7bb | 1143 | fw_schedule_device_work(device, RETRY_DELAY); |
c9755e14 SR |
1144 | |
1145 | return; | |
1146 | } | |
1147 | goto give_up; | |
1148 | } | |
1149 | ||
8b4f70ba | 1150 | fw_device_cdev_update(device); |
c9755e14 SR |
1151 | create_units(device); |
1152 | ||
0210b66d SR |
1153 | /* Userspace may want to re-read attributes. */ |
1154 | kobject_uevent(&device->device.kobj, KOBJ_CHANGE); | |
1155 | ||
c9755e14 | 1156 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1157 | FW_DEVICE_INITIALIZING, |
1158 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1159 | goto gone; |
1160 | ||
a1f64819 | 1161 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
1162 | device->config_rom_retries = 0; |
1163 | goto out; | |
1164 | ||
1165 | give_up: | |
a1f64819 | 1166 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 1167 | gone: |
3d36a0df SR |
1168 | atomic_set(&device->state, FW_DEVICE_GONE); |
1169 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
6ea9e7bb | 1170 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
c9755e14 SR |
1171 | out: |
1172 | if (node_id == card->root_node->node_id) | |
0fa1986f | 1173 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
1174 | } |
1175 | ||
19a15b93 KH |
1176 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
1177 | { | |
1178 | struct fw_device *device; | |
1179 | ||
19a15b93 KH |
1180 | switch (event) { |
1181 | case FW_NODE_CREATED: | |
115881d3 SR |
1182 | /* |
1183 | * Attempt to scan the node, regardless whether its self ID has | |
1184 | * the L (link active) flag set or not. Some broken devices | |
1185 | * send L=0 but have an up-and-running link; others send L=1 | |
1186 | * without actually having a link. | |
1187 | */ | |
c9755e14 | 1188 | create: |
19a15b93 KH |
1189 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
1190 | if (device == NULL) | |
1191 | break; | |
1192 | ||
c781c06d KH |
1193 | /* |
1194 | * Do minimal intialization of the device here, the | |
62305823 SR |
1195 | * rest will happen in fw_device_init(). |
1196 | * | |
1197 | * Attention: A lot of things, even fw_device_get(), | |
1198 | * cannot be done before fw_device_init() finished! | |
1199 | * You can basically just check device->state and | |
1200 | * schedule work until then, but only while holding | |
1201 | * card->lock. | |
c781c06d | 1202 | */ |
641f8791 | 1203 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1204 | device->card = fw_card_get(card); |
19a15b93 KH |
1205 | device->node = fw_node_get(node); |
1206 | device->node_id = node->node_id; | |
1207 | device->generation = card->generation; | |
92368890 | 1208 | device->is_local = node == card->local_node; |
d67cfb96 | 1209 | mutex_init(&device->client_list_mutex); |
97bd9efa | 1210 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1211 | |
c781c06d KH |
1212 | /* |
1213 | * Set the node data to point back to this device so | |
19a15b93 | 1214 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1215 | * and generation for the device. |
1216 | */ | |
19a15b93 KH |
1217 | node->data = device; |
1218 | ||
c781c06d KH |
1219 | /* |
1220 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1221 | * especially if they are bus powered and go through |
1222 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1223 | * first config rom scan half a second after bus reset. |
1224 | */ | |
19a15b93 | 1225 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
6ea9e7bb | 1226 | fw_schedule_device_work(device, INITIAL_DELAY); |
19a15b93 KH |
1227 | break; |
1228 | ||
c9755e14 | 1229 | case FW_NODE_INITIATED_RESET: |
115881d3 | 1230 | case FW_NODE_LINK_ON: |
c9755e14 SR |
1231 | device = node->data; |
1232 | if (device == NULL) | |
1233 | goto create; | |
1234 | ||
1235 | device->node_id = node->node_id; | |
1236 | smp_wmb(); /* update node_id before generation */ | |
1237 | device->generation = card->generation; | |
1238 | if (atomic_cmpxchg(&device->state, | |
1239 | FW_DEVICE_RUNNING, | |
1240 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1241 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
6ea9e7bb | 1242 | fw_schedule_device_work(device, |
92368890 | 1243 | device->is_local ? 0 : INITIAL_DELAY); |
c9755e14 SR |
1244 | } |
1245 | break; | |
1246 | ||
19a15b93 | 1247 | case FW_NODE_UPDATED: |
115881d3 SR |
1248 | device = node->data; |
1249 | if (device == NULL) | |
19a15b93 KH |
1250 | break; |
1251 | ||
19a15b93 | 1252 | device->node_id = node->node_id; |
b5d2a5e0 | 1253 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1254 | device->generation = card->generation; |
5f480477 KH |
1255 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1256 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
6ea9e7bb | 1257 | fw_schedule_device_work(device, 0); |
5f480477 | 1258 | } |
19a15b93 KH |
1259 | break; |
1260 | ||
1261 | case FW_NODE_DESTROYED: | |
1262 | case FW_NODE_LINK_OFF: | |
1263 | if (!node->data) | |
1264 | break; | |
1265 | ||
c781c06d KH |
1266 | /* |
1267 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1268 | * are two cases here: either the device is fully |
1269 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1270 | * process of reading its config rom | |
1271 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1272 | * initialized we can reuse device->work to schedule a | |
1273 | * full fw_device_shutdown(). If not, there's work | |
1274 | * scheduled to read it's config rom, and we just put | |
1275 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1276 | * to create the device. |
1277 | */ | |
19a15b93 | 1278 | device = node->data; |
641f8791 | 1279 | if (atomic_xchg(&device->state, |
3d36a0df | 1280 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1281 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
6ea9e7bb | 1282 | fw_schedule_device_work(device, |
e747a5c0 | 1283 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); |
19a15b93 KH |
1284 | } |
1285 | break; | |
1286 | } | |
1287 | } |