Commit | Line | Data |
---|---|---|
c781c06d KH |
1 | /* |
2 | * Device probing and sysfs code. | |
19a15b93 KH |
3 | * |
4 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software Foundation, | |
18 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
41f321c2 | 21 | #include <linux/ctype.h> |
19a15b93 | 22 | #include <linux/delay.h> |
41f321c2 SR |
23 | #include <linux/device.h> |
24 | #include <linux/errno.h> | |
a3aca3da | 25 | #include <linux/idr.h> |
3d36a0df | 26 | #include <linux/jiffies.h> |
41f321c2 SR |
27 | #include <linux/kobject.h> |
28 | #include <linux/list.h> | |
b3b29888 | 29 | #include <linux/mod_devicetable.h> |
d67cfb96 | 30 | #include <linux/mutex.h> |
6188e10d MW |
31 | #include <linux/rwsem.h> |
32 | #include <linux/semaphore.h> | |
cf417e54 | 33 | #include <linux/spinlock.h> |
41f321c2 SR |
34 | #include <linux/string.h> |
35 | #include <linux/workqueue.h> | |
36 | ||
b5d2a5e0 | 37 | #include <asm/system.h> |
41f321c2 | 38 | |
19a15b93 | 39 | #include "fw-device.h" |
41f321c2 SR |
40 | #include "fw-topology.h" |
41 | #include "fw-transaction.h" | |
19a15b93 KH |
42 | |
43 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
44 | { | |
45 | ci->p = p + 1; | |
46 | ci->end = ci->p + (p[0] >> 16); | |
47 | } | |
19a15b93 KH |
48 | EXPORT_SYMBOL(fw_csr_iterator_init); |
49 | ||
50 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
51 | { | |
52 | *key = *ci->p >> 24; | |
53 | *value = *ci->p & 0xffffff; | |
54 | ||
55 | return ci->p++ < ci->end; | |
56 | } | |
19a15b93 KH |
57 | EXPORT_SYMBOL(fw_csr_iterator_next); |
58 | ||
59 | static int is_fw_unit(struct device *dev); | |
60 | ||
b3b29888 SR |
61 | static int match_unit_directory(u32 *directory, |
62 | const struct ieee1394_device_id *id) | |
19a15b93 KH |
63 | { |
64 | struct fw_csr_iterator ci; | |
65 | int key, value, match; | |
66 | ||
67 | match = 0; | |
68 | fw_csr_iterator_init(&ci, directory); | |
69 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
b3b29888 SR |
70 | if (key == CSR_VENDOR && value == id->vendor_id) |
71 | match |= IEEE1394_MATCH_VENDOR_ID; | |
72 | if (key == CSR_MODEL && value == id->model_id) | |
73 | match |= IEEE1394_MATCH_MODEL_ID; | |
19a15b93 | 74 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) |
b3b29888 | 75 | match |= IEEE1394_MATCH_SPECIFIER_ID; |
19a15b93 | 76 | if (key == CSR_VERSION && value == id->version) |
b3b29888 | 77 | match |= IEEE1394_MATCH_VERSION; |
19a15b93 KH |
78 | } |
79 | ||
80 | return (match & id->match_flags) == id->match_flags; | |
81 | } | |
82 | ||
83 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
84 | { | |
85 | struct fw_unit *unit = fw_unit(dev); | |
86 | struct fw_driver *driver = fw_driver(drv); | |
87 | int i; | |
88 | ||
89 | /* We only allow binding to fw_units. */ | |
90 | if (!is_fw_unit(dev)) | |
91 | return 0; | |
92 | ||
93 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
94 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
95 | return 1; | |
96 | } | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
102 | { | |
103 | struct fw_device *device = fw_device(unit->device.parent); | |
104 | struct fw_csr_iterator ci; | |
105 | ||
106 | int key, value; | |
107 | int vendor = 0; | |
108 | int model = 0; | |
109 | int specifier_id = 0; | |
110 | int version = 0; | |
111 | ||
112 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
113 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
114 | switch (key) { | |
115 | case CSR_VENDOR: | |
116 | vendor = value; | |
117 | break; | |
118 | case CSR_MODEL: | |
119 | model = value; | |
120 | break; | |
121 | } | |
122 | } | |
123 | ||
124 | fw_csr_iterator_init(&ci, unit->directory); | |
125 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
126 | switch (key) { | |
127 | case CSR_SPECIFIER_ID: | |
128 | specifier_id = value; | |
129 | break; | |
130 | case CSR_VERSION: | |
131 | version = value; | |
132 | break; | |
133 | } | |
134 | } | |
135 | ||
136 | return snprintf(buffer, buffer_size, | |
137 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
138 | vendor, model, specifier_id, version); | |
139 | } | |
140 | ||
53dca511 | 141 | static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
142 | { |
143 | struct fw_unit *unit = fw_unit(dev); | |
144 | char modalias[64]; | |
19a15b93 | 145 | |
2d826cc5 | 146 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 147 | |
7eff2e7a | 148 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
149 | return -ENOMEM; |
150 | ||
19a15b93 KH |
151 | return 0; |
152 | } | |
153 | ||
154 | struct bus_type fw_bus_type = { | |
362c2c8c | 155 | .name = "firewire", |
19a15b93 | 156 | .match = fw_unit_match, |
19a15b93 | 157 | }; |
19a15b93 KH |
158 | EXPORT_SYMBOL(fw_bus_type); |
159 | ||
19a15b93 KH |
160 | int fw_device_enable_phys_dma(struct fw_device *device) |
161 | { | |
b5d2a5e0 SR |
162 | int generation = device->generation; |
163 | ||
164 | /* device->node_id, accessed below, must not be older than generation */ | |
165 | smp_rmb(); | |
166 | ||
19a15b93 KH |
167 | return device->card->driver->enable_phys_dma(device->card, |
168 | device->node_id, | |
b5d2a5e0 | 169 | generation); |
19a15b93 | 170 | } |
19a15b93 KH |
171 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
172 | ||
7feb9cce KH |
173 | struct config_rom_attribute { |
174 | struct device_attribute attr; | |
175 | u32 key; | |
176 | }; | |
177 | ||
53dca511 SR |
178 | static ssize_t show_immediate(struct device *dev, |
179 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
180 | { |
181 | struct config_rom_attribute *attr = | |
182 | container_of(dattr, struct config_rom_attribute, attr); | |
183 | struct fw_csr_iterator ci; | |
184 | u32 *dir; | |
c9755e14 SR |
185 | int key, value, ret = -ENOENT; |
186 | ||
187 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
188 | |
189 | if (is_fw_unit(dev)) | |
190 | dir = fw_unit(dev)->directory; | |
191 | else | |
192 | dir = fw_device(dev)->config_rom + 5; | |
193 | ||
194 | fw_csr_iterator_init(&ci, dir); | |
195 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
196 | if (attr->key == key) { |
197 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
198 | "0x%06x\n", value); | |
199 | break; | |
200 | } | |
201 | ||
202 | up_read(&fw_device_rwsem); | |
7feb9cce | 203 | |
c9755e14 | 204 | return ret; |
7feb9cce KH |
205 | } |
206 | ||
207 | #define IMMEDIATE_ATTR(name, key) \ | |
208 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
209 | ||
53dca511 SR |
210 | static ssize_t show_text_leaf(struct device *dev, |
211 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
212 | { |
213 | struct config_rom_attribute *attr = | |
214 | container_of(dattr, struct config_rom_attribute, attr); | |
215 | struct fw_csr_iterator ci; | |
216 | u32 *dir, *block = NULL, *p, *end; | |
c9755e14 | 217 | int length, key, value, last_key = 0, ret = -ENOENT; |
7feb9cce KH |
218 | char *b; |
219 | ||
c9755e14 SR |
220 | down_read(&fw_device_rwsem); |
221 | ||
7feb9cce KH |
222 | if (is_fw_unit(dev)) |
223 | dir = fw_unit(dev)->directory; | |
224 | else | |
225 | dir = fw_device(dev)->config_rom + 5; | |
226 | ||
227 | fw_csr_iterator_init(&ci, dir); | |
228 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
229 | if (attr->key == last_key && | |
230 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
231 | block = ci.p - 1 + value; | |
232 | last_key = key; | |
233 | } | |
234 | ||
235 | if (block == NULL) | |
c9755e14 | 236 | goto out; |
7feb9cce KH |
237 | |
238 | length = min(block[0] >> 16, 256U); | |
239 | if (length < 3) | |
c9755e14 | 240 | goto out; |
7feb9cce KH |
241 | |
242 | if (block[1] != 0 || block[2] != 0) | |
243 | /* Unknown encoding. */ | |
c9755e14 | 244 | goto out; |
7feb9cce | 245 | |
c9755e14 SR |
246 | if (buf == NULL) { |
247 | ret = length * 4; | |
248 | goto out; | |
249 | } | |
7feb9cce KH |
250 | |
251 | b = buf; | |
252 | end = &block[length + 1]; | |
253 | for (p = &block[3]; p < end; p++, b += 4) | |
254 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
255 | ||
256 | /* Strip trailing whitespace and add newline. */ | |
257 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
258 | strcpy(b + 1, "\n"); | |
c9755e14 SR |
259 | ret = b + 2 - buf; |
260 | out: | |
261 | up_read(&fw_device_rwsem); | |
7feb9cce | 262 | |
c9755e14 | 263 | return ret; |
7feb9cce KH |
264 | } |
265 | ||
266 | #define TEXT_LEAF_ATTR(name, key) \ | |
267 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
268 | ||
269 | static struct config_rom_attribute config_rom_attributes[] = { | |
270 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
271 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
272 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
273 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
274 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
275 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
276 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
277 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
278 | }; | |
279 | ||
53dca511 SR |
280 | static void init_fw_attribute_group(struct device *dev, |
281 | struct device_attribute *attrs, | |
282 | struct fw_attribute_group *group) | |
7feb9cce KH |
283 | { |
284 | struct device_attribute *attr; | |
6f2e53d5 KH |
285 | int i, j; |
286 | ||
287 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
288 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
289 | |
290 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
291 | attr = &config_rom_attributes[i].attr; | |
292 | if (attr->show(dev, attr, NULL) < 0) | |
293 | continue; | |
6f2e53d5 | 294 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
295 | } |
296 | ||
e5333db9 | 297 | group->attrs[j] = NULL; |
6f2e53d5 KH |
298 | group->groups[0] = &group->group; |
299 | group->groups[1] = NULL; | |
300 | group->group.attrs = group->attrs; | |
301 | dev->groups = group->groups; | |
7feb9cce KH |
302 | } |
303 | ||
53dca511 SR |
304 | static ssize_t modalias_show(struct device *dev, |
305 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
306 | { |
307 | struct fw_unit *unit = fw_unit(dev); | |
308 | int length; | |
309 | ||
310 | length = get_modalias(unit, buf, PAGE_SIZE); | |
311 | strcpy(buf + length, "\n"); | |
312 | ||
313 | return length + 1; | |
314 | } | |
315 | ||
53dca511 SR |
316 | static ssize_t rom_index_show(struct device *dev, |
317 | struct device_attribute *attr, char *buf) | |
19a15b93 | 318 | { |
21351dbe KH |
319 | struct fw_device *device = fw_device(dev->parent); |
320 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 321 | |
21351dbe KH |
322 | return snprintf(buf, PAGE_SIZE, "%d\n", |
323 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
324 | } |
325 | ||
21351dbe KH |
326 | static struct device_attribute fw_unit_attributes[] = { |
327 | __ATTR_RO(modalias), | |
328 | __ATTR_RO(rom_index), | |
329 | __ATTR_NULL, | |
19a15b93 KH |
330 | }; |
331 | ||
53dca511 SR |
332 | static ssize_t config_rom_show(struct device *dev, |
333 | struct device_attribute *attr, char *buf) | |
048961ef | 334 | { |
21351dbe | 335 | struct fw_device *device = fw_device(dev); |
c9755e14 | 336 | size_t length; |
048961ef | 337 | |
c9755e14 SR |
338 | down_read(&fw_device_rwsem); |
339 | length = device->config_rom_length * 4; | |
340 | memcpy(buf, device->config_rom, length); | |
341 | up_read(&fw_device_rwsem); | |
21351dbe | 342 | |
c9755e14 | 343 | return length; |
048961ef KH |
344 | } |
345 | ||
53dca511 SR |
346 | static ssize_t guid_show(struct device *dev, |
347 | struct device_attribute *attr, char *buf) | |
bbd14945 KH |
348 | { |
349 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
350 | int ret; |
351 | ||
352 | down_read(&fw_device_rwsem); | |
353 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
354 | device->config_rom[3], device->config_rom[4]); | |
355 | up_read(&fw_device_rwsem); | |
bbd14945 | 356 | |
c9755e14 | 357 | return ret; |
bbd14945 KH |
358 | } |
359 | ||
0210b66d SR |
360 | static int units_sprintf(char *buf, u32 *directory) |
361 | { | |
362 | struct fw_csr_iterator ci; | |
363 | int key, value; | |
364 | int specifier_id = 0; | |
365 | int version = 0; | |
366 | ||
367 | fw_csr_iterator_init(&ci, directory); | |
368 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
369 | switch (key) { | |
370 | case CSR_SPECIFIER_ID: | |
371 | specifier_id = value; | |
372 | break; | |
373 | case CSR_VERSION: | |
374 | version = value; | |
375 | break; | |
376 | } | |
377 | } | |
378 | ||
379 | return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version); | |
380 | } | |
381 | ||
382 | static ssize_t units_show(struct device *dev, | |
383 | struct device_attribute *attr, char *buf) | |
384 | { | |
385 | struct fw_device *device = fw_device(dev); | |
386 | struct fw_csr_iterator ci; | |
387 | int key, value, i = 0; | |
388 | ||
389 | down_read(&fw_device_rwsem); | |
390 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
391 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
392 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
393 | continue; | |
394 | i += units_sprintf(&buf[i], ci.p + value - 1); | |
395 | if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) | |
396 | break; | |
397 | } | |
398 | up_read(&fw_device_rwsem); | |
399 | ||
400 | if (i) | |
401 | buf[i - 1] = '\n'; | |
402 | ||
403 | return i; | |
404 | } | |
405 | ||
21351dbe KH |
406 | static struct device_attribute fw_device_attributes[] = { |
407 | __ATTR_RO(config_rom), | |
bbd14945 | 408 | __ATTR_RO(guid), |
0210b66d | 409 | __ATTR_RO(units), |
21351dbe | 410 | __ATTR_NULL, |
048961ef KH |
411 | }; |
412 | ||
53dca511 SR |
413 | static int read_rom(struct fw_device *device, |
414 | int generation, int index, u32 *data) | |
19a15b93 | 415 | { |
1e119fa9 | 416 | int rcode; |
b5d2a5e0 SR |
417 | |
418 | /* device->node_id, accessed below, must not be older than generation */ | |
419 | smp_rmb(); | |
19a15b93 | 420 | |
1e119fa9 | 421 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 422 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
423 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
424 | data, 4); | |
425 | be32_to_cpus(data); | |
19a15b93 | 426 | |
1e119fa9 | 427 | return rcode; |
19a15b93 KH |
428 | } |
429 | ||
1dadff71 SR |
430 | #define READ_BIB_ROM_SIZE 256 |
431 | #define READ_BIB_STACK_SIZE 16 | |
432 | ||
f8d2dc39 SR |
433 | /* |
434 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
435 | * the config ROM. We do all this with a cached bus generation. If the bus | |
436 | * generation changes under us, read_bus_info_block will fail and get retried. | |
437 | * It's better to start all over in this case because the node from which we | |
438 | * are reading the ROM may have changed the ROM during the reset. | |
439 | */ | |
440 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 441 | { |
c9755e14 | 442 | u32 *rom, *stack, *old_rom, *new_rom; |
1dadff71 SR |
443 | u32 sp, key; |
444 | int i, end, length, ret = -1; | |
445 | ||
446 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
447 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
448 | if (rom == NULL) | |
449 | return -ENOMEM; | |
450 | ||
451 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 452 | |
f1397490 SR |
453 | device->max_speed = SCODE_100; |
454 | ||
19a15b93 KH |
455 | /* First read the bus info block. */ |
456 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 457 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 458 | goto out; |
c781c06d KH |
459 | /* |
460 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
461 | * reply with a 0 for the first quadlet of the config |
462 | * rom to indicate that they are booting (for example, | |
463 | * if the firmware is on the disk of a external | |
464 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
465 | * retry mechanism will try again later. |
466 | */ | |
19a15b93 | 467 | if (i == 0 && rom[i] == 0) |
1dadff71 | 468 | goto out; |
19a15b93 KH |
469 | } |
470 | ||
f1397490 SR |
471 | device->max_speed = device->node->max_speed; |
472 | ||
473 | /* | |
474 | * Determine the speed of | |
475 | * - devices with link speed less than PHY speed, | |
476 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
477 | * - all devices if there are 1394b repeaters. | |
478 | * Note, we cannot use the bus info block's link_spd as starting point | |
479 | * because some buggy firmwares set it lower than necessary and because | |
480 | * 1394-1995 nodes do not have the field. | |
481 | */ | |
482 | if ((rom[2] & 0x7) < device->max_speed || | |
483 | device->max_speed == SCODE_BETA || | |
484 | device->card->beta_repeaters_present) { | |
485 | u32 dummy; | |
486 | ||
487 | /* for S1600 and S3200 */ | |
488 | if (device->max_speed == SCODE_BETA) | |
489 | device->max_speed = device->card->link_speed; | |
490 | ||
491 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
492 | if (read_rom(device, generation, 0, &dummy) == |
493 | RCODE_COMPLETE) | |
f1397490 SR |
494 | break; |
495 | device->max_speed--; | |
496 | } | |
497 | } | |
498 | ||
c781c06d KH |
499 | /* |
500 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
501 | * directory structure so we parse it using a stack of |
502 | * references to the blocks that make up the structure. We | |
503 | * push a reference to the root directory on the stack to | |
c781c06d KH |
504 | * start things off. |
505 | */ | |
19a15b93 KH |
506 | length = i; |
507 | sp = 0; | |
508 | stack[sp++] = 0xc0000005; | |
509 | while (sp > 0) { | |
c781c06d KH |
510 | /* |
511 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
512 | * lower 24 bits is the offset into the config rom, |
513 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
514 | * block. |
515 | */ | |
19a15b93 KH |
516 | key = stack[--sp]; |
517 | i = key & 0xffffff; | |
1dadff71 | 518 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
519 | /* |
520 | * The reference points outside the standard | |
521 | * config rom area, something's fishy. | |
522 | */ | |
1dadff71 | 523 | goto out; |
19a15b93 KH |
524 | |
525 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 526 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 527 | goto out; |
19a15b93 KH |
528 | end = i + (rom[i] >> 16) + 1; |
529 | i++; | |
1dadff71 | 530 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
531 | /* |
532 | * This block extends outside standard config | |
19a15b93 KH |
533 | * area (and the array we're reading it |
534 | * into). That's broken, so ignore this | |
c781c06d KH |
535 | * device. |
536 | */ | |
1dadff71 | 537 | goto out; |
19a15b93 | 538 | |
c781c06d KH |
539 | /* |
540 | * Now read in the block. If this is a directory | |
19a15b93 | 541 | * block, check the entries as we read them to see if |
c781c06d KH |
542 | * it references another block, and push it in that case. |
543 | */ | |
19a15b93 | 544 | while (i < end) { |
f8d2dc39 SR |
545 | if (read_rom(device, generation, i, &rom[i]) != |
546 | RCODE_COMPLETE) | |
1dadff71 | 547 | goto out; |
19a15b93 | 548 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 549 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
550 | stack[sp++] = i + rom[i]; |
551 | i++; | |
552 | } | |
553 | if (length < i) | |
554 | length = i; | |
555 | } | |
556 | ||
c9755e14 SR |
557 | old_rom = device->config_rom; |
558 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
559 | if (new_rom == NULL) | |
1dadff71 | 560 | goto out; |
c9755e14 SR |
561 | |
562 | down_write(&fw_device_rwsem); | |
563 | device->config_rom = new_rom; | |
19a15b93 | 564 | device->config_rom_length = length; |
c9755e14 SR |
565 | up_write(&fw_device_rwsem); |
566 | ||
567 | kfree(old_rom); | |
1dadff71 | 568 | ret = 0; |
7889b60e | 569 | device->cmc = rom[2] >> 30 & 1; |
1dadff71 SR |
570 | out: |
571 | kfree(rom); | |
19a15b93 | 572 | |
1dadff71 | 573 | return ret; |
19a15b93 KH |
574 | } |
575 | ||
576 | static void fw_unit_release(struct device *dev) | |
577 | { | |
578 | struct fw_unit *unit = fw_unit(dev); | |
579 | ||
580 | kfree(unit); | |
581 | } | |
582 | ||
21351dbe | 583 | static struct device_type fw_unit_type = { |
21351dbe KH |
584 | .uevent = fw_unit_uevent, |
585 | .release = fw_unit_release, | |
586 | }; | |
587 | ||
19a15b93 KH |
588 | static int is_fw_unit(struct device *dev) |
589 | { | |
21351dbe | 590 | return dev->type == &fw_unit_type; |
19a15b93 KH |
591 | } |
592 | ||
593 | static void create_units(struct fw_device *device) | |
594 | { | |
595 | struct fw_csr_iterator ci; | |
596 | struct fw_unit *unit; | |
597 | int key, value, i; | |
598 | ||
599 | i = 0; | |
600 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
601 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
602 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
603 | continue; | |
604 | ||
c781c06d KH |
605 | /* |
606 | * Get the address of the unit directory and try to | |
607 | * match the drivers id_tables against it. | |
608 | */ | |
2d826cc5 | 609 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
610 | if (unit == NULL) { |
611 | fw_error("failed to allocate memory for unit\n"); | |
612 | continue; | |
613 | } | |
614 | ||
615 | unit->directory = ci.p + value - 1; | |
616 | unit->device.bus = &fw_bus_type; | |
21351dbe | 617 | unit->device.type = &fw_unit_type; |
19a15b93 | 618 | unit->device.parent = &device->device; |
a1f64819 | 619 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 620 | |
e5333db9 SR |
621 | BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) < |
622 | ARRAY_SIZE(fw_unit_attributes) + | |
623 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
624 | init_fw_attribute_group(&unit->device, |
625 | fw_unit_attributes, | |
626 | &unit->attribute_group); | |
e5333db9 | 627 | |
7feb9cce KH |
628 | if (device_register(&unit->device) < 0) |
629 | goto skip_unit; | |
630 | ||
7feb9cce KH |
631 | continue; |
632 | ||
7feb9cce KH |
633 | skip_unit: |
634 | kfree(unit); | |
19a15b93 KH |
635 | } |
636 | } | |
637 | ||
638 | static int shutdown_unit(struct device *device, void *data) | |
639 | { | |
21351dbe | 640 | device_unregister(device); |
19a15b93 KH |
641 | |
642 | return 0; | |
643 | } | |
644 | ||
c9755e14 SR |
645 | /* |
646 | * fw_device_rwsem acts as dual purpose mutex: | |
647 | * - serializes accesses to fw_device_idr, | |
648 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
649 | * fw_unit.directory, unless those accesses happen at safe occasions | |
650 | */ | |
651 | DECLARE_RWSEM(fw_device_rwsem); | |
652 | ||
d6053e08 | 653 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
654 | int fw_cdev_major; |
655 | ||
96b19062 | 656 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
657 | { |
658 | struct fw_device *device; | |
659 | ||
c9755e14 | 660 | down_read(&fw_device_rwsem); |
a3aca3da | 661 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
662 | if (device) |
663 | fw_device_get(device); | |
c9755e14 | 664 | up_read(&fw_device_rwsem); |
a3aca3da KH |
665 | |
666 | return device; | |
667 | } | |
668 | ||
3d36a0df SR |
669 | /* |
670 | * These defines control the retry behavior for reading the config | |
671 | * rom. It shouldn't be necessary to tweak these; if the device | |
672 | * doesn't respond to a config rom read within 10 seconds, it's not | |
673 | * going to respond at all. As for the initial delay, a lot of | |
674 | * devices will be able to respond within half a second after bus | |
675 | * reset. On the other hand, it's not really worth being more | |
676 | * aggressive than that, since it scales pretty well; if 10 devices | |
677 | * are plugged in, they're all getting read within one second. | |
678 | */ | |
679 | ||
680 | #define MAX_RETRIES 10 | |
681 | #define RETRY_DELAY (3 * HZ) | |
682 | #define INITIAL_DELAY (HZ / 2) | |
683 | #define SHUTDOWN_DELAY (2 * HZ) | |
684 | ||
19a15b93 KH |
685 | static void fw_device_shutdown(struct work_struct *work) |
686 | { | |
687 | struct fw_device *device = | |
688 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
689 | int minor = MINOR(device->device.devt); |
690 | ||
e747a5c0 SR |
691 | if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) |
692 | && !list_empty(&device->card->link)) { | |
3d36a0df SR |
693 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); |
694 | return; | |
695 | } | |
696 | ||
697 | if (atomic_cmpxchg(&device->state, | |
698 | FW_DEVICE_GONE, | |
699 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
700 | return; | |
701 | ||
2603bf21 | 702 | fw_device_cdev_remove(device); |
19a15b93 KH |
703 | device_for_each_child(&device->device, NULL, shutdown_unit); |
704 | device_unregister(&device->device); | |
96b19062 | 705 | |
c9755e14 | 706 | down_write(&fw_device_rwsem); |
96b19062 | 707 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 708 | up_write(&fw_device_rwsem); |
3d36a0df | 709 | |
96b19062 | 710 | fw_device_put(device); |
19a15b93 KH |
711 | } |
712 | ||
aed80892 SR |
713 | static void fw_device_release(struct device *dev) |
714 | { | |
715 | struct fw_device *device = fw_device(dev); | |
716 | struct fw_card *card = device->card; | |
717 | unsigned long flags; | |
718 | ||
719 | /* | |
720 | * Take the card lock so we don't set this to NULL while a | |
721 | * FW_NODE_UPDATED callback is being handled or while the | |
722 | * bus manager work looks at this node. | |
723 | */ | |
724 | spin_lock_irqsave(&card->lock, flags); | |
725 | device->node->data = NULL; | |
726 | spin_unlock_irqrestore(&card->lock, flags); | |
727 | ||
728 | fw_node_put(device->node); | |
729 | kfree(device->config_rom); | |
730 | kfree(device); | |
731 | fw_card_put(card); | |
732 | } | |
733 | ||
21351dbe | 734 | static struct device_type fw_device_type = { |
aed80892 | 735 | .release = fw_device_release, |
21351dbe KH |
736 | }; |
737 | ||
aed80892 SR |
738 | static int update_unit(struct device *dev, void *data) |
739 | { | |
740 | struct fw_unit *unit = fw_unit(dev); | |
741 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
742 | ||
743 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { | |
744 | down(&dev->sem); | |
745 | driver->update(unit); | |
746 | up(&dev->sem); | |
747 | } | |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
752 | static void fw_device_update(struct work_struct *work) | |
753 | { | |
754 | struct fw_device *device = | |
755 | container_of(work, struct fw_device, work.work); | |
756 | ||
757 | fw_device_cdev_update(device); | |
758 | device_for_each_child(&device->device, NULL, update_unit); | |
759 | } | |
3d36a0df | 760 | |
c781c06d | 761 | /* |
3d36a0df SR |
762 | * If a device was pending for deletion because its node went away but its |
763 | * bus info block and root directory header matches that of a newly discovered | |
764 | * device, revive the existing fw_device. | |
765 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 766 | */ |
3d36a0df SR |
767 | static int lookup_existing_device(struct device *dev, void *data) |
768 | { | |
769 | struct fw_device *old = fw_device(dev); | |
770 | struct fw_device *new = data; | |
771 | struct fw_card *card = new->card; | |
772 | int match = 0; | |
773 | ||
774 | down_read(&fw_device_rwsem); /* serialize config_rom access */ | |
775 | spin_lock_irq(&card->lock); /* serialize node access */ | |
776 | ||
777 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
778 | atomic_cmpxchg(&old->state, | |
779 | FW_DEVICE_GONE, | |
780 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
781 | struct fw_node *current_node = new->node; | |
782 | struct fw_node *obsolete_node = old->node; | |
783 | ||
784 | new->node = obsolete_node; | |
785 | new->node->data = new; | |
786 | old->node = current_node; | |
787 | old->node->data = old; | |
788 | ||
789 | old->max_speed = new->max_speed; | |
790 | old->node_id = current_node->node_id; | |
791 | smp_wmb(); /* update node_id before generation */ | |
792 | old->generation = card->generation; | |
793 | old->config_rom_retries = 0; | |
794 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 795 | |
3d36a0df SR |
796 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
797 | schedule_delayed_work(&old->work, 0); | |
798 | ||
799 | if (current_node == card->root_node) | |
800 | fw_schedule_bm_work(card, 0); | |
801 | ||
802 | match = 1; | |
803 | } | |
804 | ||
805 | spin_unlock_irq(&card->lock); | |
806 | up_read(&fw_device_rwsem); | |
807 | ||
808 | return match; | |
809 | } | |
19a15b93 | 810 | |
7889b60e SR |
811 | enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; |
812 | ||
813 | void fw_device_set_broadcast_channel(struct fw_device *device, int generation) | |
814 | { | |
815 | struct fw_card *card = device->card; | |
816 | __be32 data; | |
817 | int rcode; | |
818 | ||
819 | if (!card->broadcast_channel_allocated) | |
820 | return; | |
821 | ||
822 | if (device->bc_implemented == BC_UNKNOWN) { | |
823 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, | |
824 | device->node_id, generation, device->max_speed, | |
825 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
826 | &data, 4); | |
827 | switch (rcode) { | |
828 | case RCODE_COMPLETE: | |
829 | if (data & cpu_to_be32(1 << 31)) { | |
830 | device->bc_implemented = BC_IMPLEMENTED; | |
831 | break; | |
832 | } | |
833 | /* else fall through to case address error */ | |
834 | case RCODE_ADDRESS_ERROR: | |
835 | device->bc_implemented = BC_UNIMPLEMENTED; | |
836 | } | |
837 | } | |
838 | ||
839 | if (device->bc_implemented == BC_IMPLEMENTED) { | |
840 | data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | | |
841 | BROADCAST_CHANNEL_VALID); | |
842 | fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, | |
843 | device->node_id, generation, device->max_speed, | |
844 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
845 | &data, 4); | |
846 | } | |
847 | } | |
848 | ||
19a15b93 KH |
849 | static void fw_device_init(struct work_struct *work) |
850 | { | |
19a15b93 KH |
851 | struct fw_device *device = |
852 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 853 | struct device *revived_dev; |
e1eff7a3 | 854 | int minor, ret; |
19a15b93 | 855 | |
c781c06d KH |
856 | /* |
857 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 858 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
859 | * device. |
860 | */ | |
19a15b93 | 861 | |
f8d2dc39 | 862 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
863 | if (device->config_rom_retries < MAX_RETRIES && |
864 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
865 | device->config_rom_retries++; |
866 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
867 | } else { | |
907293d7 | 868 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 869 | device->node_id); |
931c4834 | 870 | if (device->node == device->card->root_node) |
0fa1986f | 871 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
872 | fw_device_release(&device->device); |
873 | } | |
874 | return; | |
875 | } | |
876 | ||
3d36a0df SR |
877 | revived_dev = device_find_child(device->card->device, |
878 | device, lookup_existing_device); | |
879 | if (revived_dev) { | |
880 | put_device(revived_dev); | |
881 | fw_device_release(&device->device); | |
882 | ||
883 | return; | |
884 | } | |
885 | ||
62305823 | 886 | device_initialize(&device->device); |
96b19062 SR |
887 | |
888 | fw_device_get(device); | |
c9755e14 | 889 | down_write(&fw_device_rwsem); |
e1eff7a3 | 890 | ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
62305823 SR |
891 | idr_get_new(&fw_device_idr, device, &minor) : |
892 | -ENOMEM; | |
c9755e14 | 893 | up_write(&fw_device_rwsem); |
96b19062 | 894 | |
e1eff7a3 | 895 | if (ret < 0) |
a3aca3da KH |
896 | goto error; |
897 | ||
19a15b93 | 898 | device->device.bus = &fw_bus_type; |
21351dbe | 899 | device->device.type = &fw_device_type; |
19a15b93 | 900 | device->device.parent = device->card->device; |
a3aca3da | 901 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 902 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 903 | |
e5333db9 SR |
904 | BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) < |
905 | ARRAY_SIZE(fw_device_attributes) + | |
906 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
907 | init_fw_attribute_group(&device->device, |
908 | fw_device_attributes, | |
909 | &device->attribute_group); | |
e5333db9 | 910 | |
19a15b93 KH |
911 | if (device_add(&device->device)) { |
912 | fw_error("Failed to add device.\n"); | |
a3aca3da | 913 | goto error_with_cdev; |
19a15b93 KH |
914 | } |
915 | ||
19a15b93 KH |
916 | create_units(device); |
917 | ||
c781c06d KH |
918 | /* |
919 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
920 | * out from under us while we did the intialization work, we |
921 | * have to shut down the device again here. Normally, though, | |
922 | * fw_node_event will be responsible for shutting it down when | |
923 | * necessary. We have to use the atomic cmpxchg here to avoid | |
924 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
925 | * fw_node_event(). |
926 | */ | |
641f8791 | 927 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
928 | FW_DEVICE_INITIALIZING, |
929 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
930 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
931 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
fa6e697b SR |
932 | } else { |
933 | if (device->config_rom_retries) | |
934 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
935 | "%d config ROM retries\n", | |
a1f64819 | 936 | dev_name(&device->device), |
fa6e697b SR |
937 | device->config_rom[3], device->config_rom[4], |
938 | 1 << device->max_speed, | |
939 | device->config_rom_retries); | |
940 | else | |
941 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 942 | dev_name(&device->device), |
fa6e697b SR |
943 | device->config_rom[3], device->config_rom[4], |
944 | 1 << device->max_speed); | |
c9755e14 | 945 | device->config_rom_retries = 0; |
7889b60e SR |
946 | |
947 | fw_device_set_broadcast_channel(device, device->generation); | |
fa6e697b | 948 | } |
19a15b93 | 949 | |
c781c06d KH |
950 | /* |
951 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
952 | * root node config rom. If this races with a bus reset we |
953 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
954 | * pretty harmless. |
955 | */ | |
19a15b93 | 956 | if (device->node == device->card->root_node) |
0fa1986f | 957 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
958 | |
959 | return; | |
960 | ||
a3aca3da | 961 | error_with_cdev: |
c9755e14 | 962 | down_write(&fw_device_rwsem); |
a3aca3da | 963 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 964 | up_write(&fw_device_rwsem); |
373b2edd | 965 | error: |
96b19062 SR |
966 | fw_device_put(device); /* fw_device_idr's reference */ |
967 | ||
968 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
969 | } |
970 | ||
c9755e14 SR |
971 | enum { |
972 | REREAD_BIB_ERROR, | |
973 | REREAD_BIB_GONE, | |
974 | REREAD_BIB_UNCHANGED, | |
975 | REREAD_BIB_CHANGED, | |
976 | }; | |
977 | ||
978 | /* Reread and compare bus info block and header of root directory */ | |
979 | static int reread_bus_info_block(struct fw_device *device, int generation) | |
980 | { | |
981 | u32 q; | |
982 | int i; | |
983 | ||
984 | for (i = 0; i < 6; i++) { | |
985 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
986 | return REREAD_BIB_ERROR; | |
987 | ||
988 | if (i == 0 && q == 0) | |
989 | return REREAD_BIB_GONE; | |
990 | ||
d01b0178 | 991 | if (q != device->config_rom[i]) |
c9755e14 SR |
992 | return REREAD_BIB_CHANGED; |
993 | } | |
994 | ||
995 | return REREAD_BIB_UNCHANGED; | |
996 | } | |
997 | ||
998 | static void fw_device_refresh(struct work_struct *work) | |
999 | { | |
1000 | struct fw_device *device = | |
1001 | container_of(work, struct fw_device, work.work); | |
1002 | struct fw_card *card = device->card; | |
1003 | int node_id = device->node_id; | |
1004 | ||
1005 | switch (reread_bus_info_block(device, device->generation)) { | |
1006 | case REREAD_BIB_ERROR: | |
1007 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
1008 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1009 | device->config_rom_retries++; | |
1010 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
1011 | ||
1012 | return; | |
1013 | } | |
1014 | goto give_up; | |
1015 | ||
1016 | case REREAD_BIB_GONE: | |
1017 | goto gone; | |
1018 | ||
1019 | case REREAD_BIB_UNCHANGED: | |
1020 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
1021 | FW_DEVICE_INITIALIZING, |
1022 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1023 | goto gone; |
1024 | ||
1025 | fw_device_update(work); | |
1026 | device->config_rom_retries = 0; | |
1027 | goto out; | |
1028 | ||
1029 | case REREAD_BIB_CHANGED: | |
1030 | break; | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * Something changed. We keep things simple and don't investigate | |
1035 | * further. We just destroy all previous units and create new ones. | |
1036 | */ | |
1037 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
1038 | ||
1039 | if (read_bus_info_block(device, device->generation) < 0) { | |
1040 | if (device->config_rom_retries < MAX_RETRIES && | |
1041 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1042 | device->config_rom_retries++; | |
1043 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
1044 | ||
1045 | return; | |
1046 | } | |
1047 | goto give_up; | |
1048 | } | |
1049 | ||
1050 | create_units(device); | |
1051 | ||
0210b66d SR |
1052 | /* Userspace may want to re-read attributes. */ |
1053 | kobject_uevent(&device->device.kobj, KOBJ_CHANGE); | |
1054 | ||
c9755e14 | 1055 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1056 | FW_DEVICE_INITIALIZING, |
1057 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1058 | goto gone; |
1059 | ||
a1f64819 | 1060 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
1061 | device->config_rom_retries = 0; |
1062 | goto out; | |
1063 | ||
1064 | give_up: | |
a1f64819 | 1065 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 1066 | gone: |
3d36a0df SR |
1067 | atomic_set(&device->state, FW_DEVICE_GONE); |
1068 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
1069 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
c9755e14 SR |
1070 | out: |
1071 | if (node_id == card->root_node->node_id) | |
0fa1986f | 1072 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
1073 | } |
1074 | ||
19a15b93 KH |
1075 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
1076 | { | |
1077 | struct fw_device *device; | |
1078 | ||
19a15b93 KH |
1079 | switch (event) { |
1080 | case FW_NODE_CREATED: | |
1081 | case FW_NODE_LINK_ON: | |
1082 | if (!node->link_on) | |
1083 | break; | |
c9755e14 | 1084 | create: |
19a15b93 KH |
1085 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
1086 | if (device == NULL) | |
1087 | break; | |
1088 | ||
c781c06d KH |
1089 | /* |
1090 | * Do minimal intialization of the device here, the | |
62305823 SR |
1091 | * rest will happen in fw_device_init(). |
1092 | * | |
1093 | * Attention: A lot of things, even fw_device_get(), | |
1094 | * cannot be done before fw_device_init() finished! | |
1095 | * You can basically just check device->state and | |
1096 | * schedule work until then, but only while holding | |
1097 | * card->lock. | |
c781c06d | 1098 | */ |
641f8791 | 1099 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1100 | device->card = fw_card_get(card); |
19a15b93 KH |
1101 | device->node = fw_node_get(node); |
1102 | device->node_id = node->node_id; | |
1103 | device->generation = card->generation; | |
92368890 | 1104 | device->is_local = node == card->local_node; |
d67cfb96 | 1105 | mutex_init(&device->client_list_mutex); |
97bd9efa | 1106 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1107 | |
c781c06d KH |
1108 | /* |
1109 | * Set the node data to point back to this device so | |
19a15b93 | 1110 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1111 | * and generation for the device. |
1112 | */ | |
19a15b93 KH |
1113 | node->data = device; |
1114 | ||
c781c06d KH |
1115 | /* |
1116 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1117 | * especially if they are bus powered and go through |
1118 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1119 | * first config rom scan half a second after bus reset. |
1120 | */ | |
19a15b93 KH |
1121 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1122 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
1123 | break; | |
1124 | ||
c9755e14 SR |
1125 | case FW_NODE_INITIATED_RESET: |
1126 | device = node->data; | |
1127 | if (device == NULL) | |
1128 | goto create; | |
1129 | ||
1130 | device->node_id = node->node_id; | |
1131 | smp_wmb(); /* update node_id before generation */ | |
1132 | device->generation = card->generation; | |
1133 | if (atomic_cmpxchg(&device->state, | |
1134 | FW_DEVICE_RUNNING, | |
1135 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1136 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
1137 | schedule_delayed_work(&device->work, | |
92368890 | 1138 | device->is_local ? 0 : INITIAL_DELAY); |
c9755e14 SR |
1139 | } |
1140 | break; | |
1141 | ||
19a15b93 KH |
1142 | case FW_NODE_UPDATED: |
1143 | if (!node->link_on || node->data == NULL) | |
1144 | break; | |
1145 | ||
1146 | device = node->data; | |
1147 | device->node_id = node->node_id; | |
b5d2a5e0 | 1148 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1149 | device->generation = card->generation; |
5f480477 KH |
1150 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1151 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
1152 | schedule_delayed_work(&device->work, 0); | |
1153 | } | |
19a15b93 KH |
1154 | break; |
1155 | ||
1156 | case FW_NODE_DESTROYED: | |
1157 | case FW_NODE_LINK_OFF: | |
1158 | if (!node->data) | |
1159 | break; | |
1160 | ||
c781c06d KH |
1161 | /* |
1162 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1163 | * are two cases here: either the device is fully |
1164 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1165 | * process of reading its config rom | |
1166 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1167 | * initialized we can reuse device->work to schedule a | |
1168 | * full fw_device_shutdown(). If not, there's work | |
1169 | * scheduled to read it's config rom, and we just put | |
1170 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1171 | * to create the device. |
1172 | */ | |
19a15b93 | 1173 | device = node->data; |
641f8791 | 1174 | if (atomic_xchg(&device->state, |
3d36a0df | 1175 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1176 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
e747a5c0 SR |
1177 | schedule_delayed_work(&device->work, |
1178 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); | |
19a15b93 KH |
1179 | } |
1180 | break; | |
1181 | } | |
1182 | } |