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 | ||
e41f8d70 | 61 | static int match_unit_directory(u32 *directory, u32 match_flags, |
b3b29888 | 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 | ||
e41f8d70 | 80 | return (match & match_flags) == match_flags; |
19a15b93 KH |
81 | } |
82 | ||
83 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
84 | { | |
85 | struct fw_unit *unit = fw_unit(dev); | |
e41f8d70 SR |
86 | struct fw_device *device; |
87 | const struct ieee1394_device_id *id; | |
19a15b93 KH |
88 | |
89 | /* We only allow binding to fw_units. */ | |
90 | if (!is_fw_unit(dev)) | |
91 | return 0; | |
92 | ||
e41f8d70 SR |
93 | device = fw_device(unit->device.parent); |
94 | ||
95 | for (id = fw_driver(drv)->id_table; id->match_flags != 0; id++) { | |
96 | if (match_unit_directory(unit->directory, id->match_flags, id)) | |
97 | return 1; | |
98 | ||
99 | /* Also check vendor ID in the root directory. */ | |
100 | if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) && | |
101 | match_unit_directory(&device->config_rom[5], | |
102 | IEEE1394_MATCH_VENDOR_ID, id) && | |
103 | match_unit_directory(unit->directory, id->match_flags | |
104 | & ~IEEE1394_MATCH_VENDOR_ID, id)) | |
19a15b93 KH |
105 | return 1; |
106 | } | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
112 | { | |
113 | struct fw_device *device = fw_device(unit->device.parent); | |
114 | struct fw_csr_iterator ci; | |
115 | ||
116 | int key, value; | |
117 | int vendor = 0; | |
118 | int model = 0; | |
119 | int specifier_id = 0; | |
120 | int version = 0; | |
121 | ||
122 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
123 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
124 | switch (key) { | |
125 | case CSR_VENDOR: | |
126 | vendor = value; | |
127 | break; | |
128 | case CSR_MODEL: | |
129 | model = value; | |
130 | break; | |
131 | } | |
132 | } | |
133 | ||
134 | fw_csr_iterator_init(&ci, unit->directory); | |
135 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
136 | switch (key) { | |
137 | case CSR_SPECIFIER_ID: | |
138 | specifier_id = value; | |
139 | break; | |
140 | case CSR_VERSION: | |
141 | version = value; | |
142 | break; | |
143 | } | |
144 | } | |
145 | ||
146 | return snprintf(buffer, buffer_size, | |
147 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
148 | vendor, model, specifier_id, version); | |
149 | } | |
150 | ||
53dca511 | 151 | static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
152 | { |
153 | struct fw_unit *unit = fw_unit(dev); | |
154 | char modalias[64]; | |
19a15b93 | 155 | |
2d826cc5 | 156 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 157 | |
7eff2e7a | 158 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
159 | return -ENOMEM; |
160 | ||
19a15b93 KH |
161 | return 0; |
162 | } | |
163 | ||
164 | struct bus_type fw_bus_type = { | |
362c2c8c | 165 | .name = "firewire", |
19a15b93 | 166 | .match = fw_unit_match, |
19a15b93 | 167 | }; |
19a15b93 KH |
168 | EXPORT_SYMBOL(fw_bus_type); |
169 | ||
19a15b93 KH |
170 | int fw_device_enable_phys_dma(struct fw_device *device) |
171 | { | |
b5d2a5e0 SR |
172 | int generation = device->generation; |
173 | ||
174 | /* device->node_id, accessed below, must not be older than generation */ | |
175 | smp_rmb(); | |
176 | ||
19a15b93 KH |
177 | return device->card->driver->enable_phys_dma(device->card, |
178 | device->node_id, | |
b5d2a5e0 | 179 | generation); |
19a15b93 | 180 | } |
19a15b93 KH |
181 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
182 | ||
7feb9cce KH |
183 | struct config_rom_attribute { |
184 | struct device_attribute attr; | |
185 | u32 key; | |
186 | }; | |
187 | ||
53dca511 SR |
188 | static ssize_t show_immediate(struct device *dev, |
189 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
190 | { |
191 | struct config_rom_attribute *attr = | |
192 | container_of(dattr, struct config_rom_attribute, attr); | |
193 | struct fw_csr_iterator ci; | |
194 | u32 *dir; | |
c9755e14 SR |
195 | int key, value, ret = -ENOENT; |
196 | ||
197 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
198 | |
199 | if (is_fw_unit(dev)) | |
200 | dir = fw_unit(dev)->directory; | |
201 | else | |
202 | dir = fw_device(dev)->config_rom + 5; | |
203 | ||
204 | fw_csr_iterator_init(&ci, dir); | |
205 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
206 | if (attr->key == key) { |
207 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
208 | "0x%06x\n", value); | |
209 | break; | |
210 | } | |
211 | ||
212 | up_read(&fw_device_rwsem); | |
7feb9cce | 213 | |
c9755e14 | 214 | return ret; |
7feb9cce KH |
215 | } |
216 | ||
217 | #define IMMEDIATE_ATTR(name, key) \ | |
218 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
219 | ||
53dca511 SR |
220 | static ssize_t show_text_leaf(struct device *dev, |
221 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
222 | { |
223 | struct config_rom_attribute *attr = | |
224 | container_of(dattr, struct config_rom_attribute, attr); | |
225 | struct fw_csr_iterator ci; | |
226 | u32 *dir, *block = NULL, *p, *end; | |
c9755e14 | 227 | int length, key, value, last_key = 0, ret = -ENOENT; |
7feb9cce KH |
228 | char *b; |
229 | ||
c9755e14 SR |
230 | down_read(&fw_device_rwsem); |
231 | ||
7feb9cce KH |
232 | if (is_fw_unit(dev)) |
233 | dir = fw_unit(dev)->directory; | |
234 | else | |
235 | dir = fw_device(dev)->config_rom + 5; | |
236 | ||
237 | fw_csr_iterator_init(&ci, dir); | |
238 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
239 | if (attr->key == last_key && | |
240 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
241 | block = ci.p - 1 + value; | |
242 | last_key = key; | |
243 | } | |
244 | ||
245 | if (block == NULL) | |
c9755e14 | 246 | goto out; |
7feb9cce KH |
247 | |
248 | length = min(block[0] >> 16, 256U); | |
249 | if (length < 3) | |
c9755e14 | 250 | goto out; |
7feb9cce KH |
251 | |
252 | if (block[1] != 0 || block[2] != 0) | |
253 | /* Unknown encoding. */ | |
c9755e14 | 254 | goto out; |
7feb9cce | 255 | |
c9755e14 SR |
256 | if (buf == NULL) { |
257 | ret = length * 4; | |
258 | goto out; | |
259 | } | |
7feb9cce KH |
260 | |
261 | b = buf; | |
262 | end = &block[length + 1]; | |
263 | for (p = &block[3]; p < end; p++, b += 4) | |
264 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
265 | ||
266 | /* Strip trailing whitespace and add newline. */ | |
267 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
268 | strcpy(b + 1, "\n"); | |
c9755e14 SR |
269 | ret = b + 2 - buf; |
270 | out: | |
271 | up_read(&fw_device_rwsem); | |
7feb9cce | 272 | |
c9755e14 | 273 | return ret; |
7feb9cce KH |
274 | } |
275 | ||
276 | #define TEXT_LEAF_ATTR(name, key) \ | |
277 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
278 | ||
279 | static struct config_rom_attribute config_rom_attributes[] = { | |
280 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
281 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
282 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
283 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
284 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
285 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
286 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
287 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
288 | }; | |
289 | ||
53dca511 SR |
290 | static void init_fw_attribute_group(struct device *dev, |
291 | struct device_attribute *attrs, | |
292 | struct fw_attribute_group *group) | |
7feb9cce KH |
293 | { |
294 | struct device_attribute *attr; | |
6f2e53d5 KH |
295 | int i, j; |
296 | ||
297 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
298 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
299 | |
300 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
301 | attr = &config_rom_attributes[i].attr; | |
302 | if (attr->show(dev, attr, NULL) < 0) | |
303 | continue; | |
6f2e53d5 | 304 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
305 | } |
306 | ||
e5333db9 | 307 | group->attrs[j] = NULL; |
6f2e53d5 KH |
308 | group->groups[0] = &group->group; |
309 | group->groups[1] = NULL; | |
310 | group->group.attrs = group->attrs; | |
311 | dev->groups = group->groups; | |
7feb9cce KH |
312 | } |
313 | ||
53dca511 SR |
314 | static ssize_t modalias_show(struct device *dev, |
315 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
316 | { |
317 | struct fw_unit *unit = fw_unit(dev); | |
318 | int length; | |
319 | ||
320 | length = get_modalias(unit, buf, PAGE_SIZE); | |
321 | strcpy(buf + length, "\n"); | |
322 | ||
323 | return length + 1; | |
324 | } | |
325 | ||
53dca511 SR |
326 | static ssize_t rom_index_show(struct device *dev, |
327 | struct device_attribute *attr, char *buf) | |
19a15b93 | 328 | { |
21351dbe KH |
329 | struct fw_device *device = fw_device(dev->parent); |
330 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 331 | |
21351dbe KH |
332 | return snprintf(buf, PAGE_SIZE, "%d\n", |
333 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
334 | } |
335 | ||
21351dbe KH |
336 | static struct device_attribute fw_unit_attributes[] = { |
337 | __ATTR_RO(modalias), | |
338 | __ATTR_RO(rom_index), | |
339 | __ATTR_NULL, | |
19a15b93 KH |
340 | }; |
341 | ||
53dca511 SR |
342 | static ssize_t config_rom_show(struct device *dev, |
343 | struct device_attribute *attr, char *buf) | |
048961ef | 344 | { |
21351dbe | 345 | struct fw_device *device = fw_device(dev); |
c9755e14 | 346 | size_t length; |
048961ef | 347 | |
c9755e14 SR |
348 | down_read(&fw_device_rwsem); |
349 | length = device->config_rom_length * 4; | |
350 | memcpy(buf, device->config_rom, length); | |
351 | up_read(&fw_device_rwsem); | |
21351dbe | 352 | |
c9755e14 | 353 | return length; |
048961ef KH |
354 | } |
355 | ||
53dca511 SR |
356 | static ssize_t guid_show(struct device *dev, |
357 | struct device_attribute *attr, char *buf) | |
bbd14945 KH |
358 | { |
359 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
360 | int ret; |
361 | ||
362 | down_read(&fw_device_rwsem); | |
363 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
364 | device->config_rom[3], device->config_rom[4]); | |
365 | up_read(&fw_device_rwsem); | |
bbd14945 | 366 | |
c9755e14 | 367 | return ret; |
bbd14945 KH |
368 | } |
369 | ||
0210b66d SR |
370 | static int units_sprintf(char *buf, u32 *directory) |
371 | { | |
372 | struct fw_csr_iterator ci; | |
373 | int key, value; | |
374 | int specifier_id = 0; | |
375 | int version = 0; | |
376 | ||
377 | fw_csr_iterator_init(&ci, directory); | |
378 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
379 | switch (key) { | |
380 | case CSR_SPECIFIER_ID: | |
381 | specifier_id = value; | |
382 | break; | |
383 | case CSR_VERSION: | |
384 | version = value; | |
385 | break; | |
386 | } | |
387 | } | |
388 | ||
389 | return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version); | |
390 | } | |
391 | ||
392 | static ssize_t units_show(struct device *dev, | |
393 | struct device_attribute *attr, char *buf) | |
394 | { | |
395 | struct fw_device *device = fw_device(dev); | |
396 | struct fw_csr_iterator ci; | |
397 | int key, value, i = 0; | |
398 | ||
399 | down_read(&fw_device_rwsem); | |
400 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
401 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
402 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
403 | continue; | |
404 | i += units_sprintf(&buf[i], ci.p + value - 1); | |
405 | if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) | |
406 | break; | |
407 | } | |
408 | up_read(&fw_device_rwsem); | |
409 | ||
410 | if (i) | |
411 | buf[i - 1] = '\n'; | |
412 | ||
413 | return i; | |
414 | } | |
415 | ||
21351dbe KH |
416 | static struct device_attribute fw_device_attributes[] = { |
417 | __ATTR_RO(config_rom), | |
bbd14945 | 418 | __ATTR_RO(guid), |
0210b66d | 419 | __ATTR_RO(units), |
21351dbe | 420 | __ATTR_NULL, |
048961ef KH |
421 | }; |
422 | ||
53dca511 SR |
423 | static int read_rom(struct fw_device *device, |
424 | int generation, int index, u32 *data) | |
19a15b93 | 425 | { |
1e119fa9 | 426 | int rcode; |
b5d2a5e0 SR |
427 | |
428 | /* device->node_id, accessed below, must not be older than generation */ | |
429 | smp_rmb(); | |
19a15b93 | 430 | |
1e119fa9 | 431 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 432 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
433 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
434 | data, 4); | |
435 | be32_to_cpus(data); | |
19a15b93 | 436 | |
1e119fa9 | 437 | return rcode; |
19a15b93 KH |
438 | } |
439 | ||
1dadff71 SR |
440 | #define READ_BIB_ROM_SIZE 256 |
441 | #define READ_BIB_STACK_SIZE 16 | |
442 | ||
f8d2dc39 SR |
443 | /* |
444 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
445 | * the config ROM. We do all this with a cached bus generation. If the bus | |
446 | * generation changes under us, read_bus_info_block will fail and get retried. | |
447 | * It's better to start all over in this case because the node from which we | |
448 | * are reading the ROM may have changed the ROM during the reset. | |
449 | */ | |
450 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 451 | { |
c9755e14 | 452 | u32 *rom, *stack, *old_rom, *new_rom; |
1dadff71 SR |
453 | u32 sp, key; |
454 | int i, end, length, ret = -1; | |
455 | ||
456 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
457 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
458 | if (rom == NULL) | |
459 | return -ENOMEM; | |
460 | ||
461 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 462 | |
f1397490 SR |
463 | device->max_speed = SCODE_100; |
464 | ||
19a15b93 KH |
465 | /* First read the bus info block. */ |
466 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 467 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 468 | goto out; |
c781c06d KH |
469 | /* |
470 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
471 | * reply with a 0 for the first quadlet of the config |
472 | * rom to indicate that they are booting (for example, | |
473 | * if the firmware is on the disk of a external | |
474 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
475 | * retry mechanism will try again later. |
476 | */ | |
19a15b93 | 477 | if (i == 0 && rom[i] == 0) |
1dadff71 | 478 | goto out; |
19a15b93 KH |
479 | } |
480 | ||
f1397490 SR |
481 | device->max_speed = device->node->max_speed; |
482 | ||
483 | /* | |
484 | * Determine the speed of | |
485 | * - devices with link speed less than PHY speed, | |
486 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
487 | * - all devices if there are 1394b repeaters. | |
488 | * Note, we cannot use the bus info block's link_spd as starting point | |
489 | * because some buggy firmwares set it lower than necessary and because | |
490 | * 1394-1995 nodes do not have the field. | |
491 | */ | |
492 | if ((rom[2] & 0x7) < device->max_speed || | |
493 | device->max_speed == SCODE_BETA || | |
494 | device->card->beta_repeaters_present) { | |
495 | u32 dummy; | |
496 | ||
497 | /* for S1600 and S3200 */ | |
498 | if (device->max_speed == SCODE_BETA) | |
499 | device->max_speed = device->card->link_speed; | |
500 | ||
501 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
502 | if (read_rom(device, generation, 0, &dummy) == |
503 | RCODE_COMPLETE) | |
f1397490 SR |
504 | break; |
505 | device->max_speed--; | |
506 | } | |
507 | } | |
508 | ||
c781c06d KH |
509 | /* |
510 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
511 | * directory structure so we parse it using a stack of |
512 | * references to the blocks that make up the structure. We | |
513 | * push a reference to the root directory on the stack to | |
c781c06d KH |
514 | * start things off. |
515 | */ | |
19a15b93 KH |
516 | length = i; |
517 | sp = 0; | |
518 | stack[sp++] = 0xc0000005; | |
519 | while (sp > 0) { | |
c781c06d KH |
520 | /* |
521 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
522 | * lower 24 bits is the offset into the config rom, |
523 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
524 | * block. |
525 | */ | |
19a15b93 KH |
526 | key = stack[--sp]; |
527 | i = key & 0xffffff; | |
1dadff71 | 528 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
529 | /* |
530 | * The reference points outside the standard | |
531 | * config rom area, something's fishy. | |
532 | */ | |
1dadff71 | 533 | goto out; |
19a15b93 KH |
534 | |
535 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 536 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 537 | goto out; |
19a15b93 KH |
538 | end = i + (rom[i] >> 16) + 1; |
539 | i++; | |
1dadff71 | 540 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
541 | /* |
542 | * This block extends outside standard config | |
19a15b93 KH |
543 | * area (and the array we're reading it |
544 | * into). That's broken, so ignore this | |
c781c06d KH |
545 | * device. |
546 | */ | |
1dadff71 | 547 | goto out; |
19a15b93 | 548 | |
c781c06d KH |
549 | /* |
550 | * Now read in the block. If this is a directory | |
19a15b93 | 551 | * block, check the entries as we read them to see if |
c781c06d KH |
552 | * it references another block, and push it in that case. |
553 | */ | |
19a15b93 | 554 | while (i < end) { |
f8d2dc39 SR |
555 | if (read_rom(device, generation, i, &rom[i]) != |
556 | RCODE_COMPLETE) | |
1dadff71 | 557 | goto out; |
19a15b93 | 558 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 559 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
560 | stack[sp++] = i + rom[i]; |
561 | i++; | |
562 | } | |
563 | if (length < i) | |
564 | length = i; | |
565 | } | |
566 | ||
c9755e14 SR |
567 | old_rom = device->config_rom; |
568 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
569 | if (new_rom == NULL) | |
1dadff71 | 570 | goto out; |
c9755e14 SR |
571 | |
572 | down_write(&fw_device_rwsem); | |
573 | device->config_rom = new_rom; | |
19a15b93 | 574 | device->config_rom_length = length; |
c9755e14 SR |
575 | up_write(&fw_device_rwsem); |
576 | ||
577 | kfree(old_rom); | |
1dadff71 | 578 | ret = 0; |
7889b60e | 579 | device->cmc = rom[2] >> 30 & 1; |
1dadff71 SR |
580 | out: |
581 | kfree(rom); | |
19a15b93 | 582 | |
1dadff71 | 583 | return ret; |
19a15b93 KH |
584 | } |
585 | ||
586 | static void fw_unit_release(struct device *dev) | |
587 | { | |
588 | struct fw_unit *unit = fw_unit(dev); | |
589 | ||
590 | kfree(unit); | |
591 | } | |
592 | ||
21351dbe | 593 | static struct device_type fw_unit_type = { |
21351dbe KH |
594 | .uevent = fw_unit_uevent, |
595 | .release = fw_unit_release, | |
596 | }; | |
597 | ||
19a15b93 KH |
598 | static int is_fw_unit(struct device *dev) |
599 | { | |
21351dbe | 600 | return dev->type == &fw_unit_type; |
19a15b93 KH |
601 | } |
602 | ||
603 | static void create_units(struct fw_device *device) | |
604 | { | |
605 | struct fw_csr_iterator ci; | |
606 | struct fw_unit *unit; | |
607 | int key, value, i; | |
608 | ||
609 | i = 0; | |
610 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
611 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
612 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
613 | continue; | |
614 | ||
c781c06d KH |
615 | /* |
616 | * Get the address of the unit directory and try to | |
617 | * match the drivers id_tables against it. | |
618 | */ | |
2d826cc5 | 619 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
620 | if (unit == NULL) { |
621 | fw_error("failed to allocate memory for unit\n"); | |
622 | continue; | |
623 | } | |
624 | ||
625 | unit->directory = ci.p + value - 1; | |
626 | unit->device.bus = &fw_bus_type; | |
21351dbe | 627 | unit->device.type = &fw_unit_type; |
19a15b93 | 628 | unit->device.parent = &device->device; |
a1f64819 | 629 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 630 | |
e5333db9 SR |
631 | BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) < |
632 | ARRAY_SIZE(fw_unit_attributes) + | |
633 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
634 | init_fw_attribute_group(&unit->device, |
635 | fw_unit_attributes, | |
636 | &unit->attribute_group); | |
e5333db9 | 637 | |
7feb9cce KH |
638 | if (device_register(&unit->device) < 0) |
639 | goto skip_unit; | |
640 | ||
7feb9cce KH |
641 | continue; |
642 | ||
7feb9cce KH |
643 | skip_unit: |
644 | kfree(unit); | |
19a15b93 KH |
645 | } |
646 | } | |
647 | ||
648 | static int shutdown_unit(struct device *device, void *data) | |
649 | { | |
21351dbe | 650 | device_unregister(device); |
19a15b93 KH |
651 | |
652 | return 0; | |
653 | } | |
654 | ||
c9755e14 SR |
655 | /* |
656 | * fw_device_rwsem acts as dual purpose mutex: | |
657 | * - serializes accesses to fw_device_idr, | |
658 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
659 | * fw_unit.directory, unless those accesses happen at safe occasions | |
660 | */ | |
661 | DECLARE_RWSEM(fw_device_rwsem); | |
662 | ||
d6053e08 | 663 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
664 | int fw_cdev_major; |
665 | ||
96b19062 | 666 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
667 | { |
668 | struct fw_device *device; | |
669 | ||
c9755e14 | 670 | down_read(&fw_device_rwsem); |
a3aca3da | 671 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
672 | if (device) |
673 | fw_device_get(device); | |
c9755e14 | 674 | up_read(&fw_device_rwsem); |
a3aca3da KH |
675 | |
676 | return device; | |
677 | } | |
678 | ||
3d36a0df SR |
679 | /* |
680 | * These defines control the retry behavior for reading the config | |
681 | * rom. It shouldn't be necessary to tweak these; if the device | |
682 | * doesn't respond to a config rom read within 10 seconds, it's not | |
683 | * going to respond at all. As for the initial delay, a lot of | |
684 | * devices will be able to respond within half a second after bus | |
685 | * reset. On the other hand, it's not really worth being more | |
686 | * aggressive than that, since it scales pretty well; if 10 devices | |
687 | * are plugged in, they're all getting read within one second. | |
688 | */ | |
689 | ||
690 | #define MAX_RETRIES 10 | |
691 | #define RETRY_DELAY (3 * HZ) | |
692 | #define INITIAL_DELAY (HZ / 2) | |
693 | #define SHUTDOWN_DELAY (2 * HZ) | |
694 | ||
19a15b93 KH |
695 | static void fw_device_shutdown(struct work_struct *work) |
696 | { | |
697 | struct fw_device *device = | |
698 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
699 | int minor = MINOR(device->device.devt); |
700 | ||
e747a5c0 SR |
701 | if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) |
702 | && !list_empty(&device->card->link)) { | |
3d36a0df SR |
703 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); |
704 | return; | |
705 | } | |
706 | ||
707 | if (atomic_cmpxchg(&device->state, | |
708 | FW_DEVICE_GONE, | |
709 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
710 | return; | |
711 | ||
2603bf21 | 712 | fw_device_cdev_remove(device); |
19a15b93 KH |
713 | device_for_each_child(&device->device, NULL, shutdown_unit); |
714 | device_unregister(&device->device); | |
96b19062 | 715 | |
c9755e14 | 716 | down_write(&fw_device_rwsem); |
96b19062 | 717 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 718 | up_write(&fw_device_rwsem); |
3d36a0df | 719 | |
96b19062 | 720 | fw_device_put(device); |
19a15b93 KH |
721 | } |
722 | ||
aed80892 SR |
723 | static void fw_device_release(struct device *dev) |
724 | { | |
725 | struct fw_device *device = fw_device(dev); | |
726 | struct fw_card *card = device->card; | |
727 | unsigned long flags; | |
728 | ||
729 | /* | |
730 | * Take the card lock so we don't set this to NULL while a | |
731 | * FW_NODE_UPDATED callback is being handled or while the | |
732 | * bus manager work looks at this node. | |
733 | */ | |
734 | spin_lock_irqsave(&card->lock, flags); | |
735 | device->node->data = NULL; | |
736 | spin_unlock_irqrestore(&card->lock, flags); | |
737 | ||
738 | fw_node_put(device->node); | |
739 | kfree(device->config_rom); | |
740 | kfree(device); | |
741 | fw_card_put(card); | |
742 | } | |
743 | ||
21351dbe | 744 | static struct device_type fw_device_type = { |
aed80892 | 745 | .release = fw_device_release, |
21351dbe KH |
746 | }; |
747 | ||
aed80892 SR |
748 | static int update_unit(struct device *dev, void *data) |
749 | { | |
750 | struct fw_unit *unit = fw_unit(dev); | |
751 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
752 | ||
753 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { | |
754 | down(&dev->sem); | |
755 | driver->update(unit); | |
756 | up(&dev->sem); | |
757 | } | |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
762 | static void fw_device_update(struct work_struct *work) | |
763 | { | |
764 | struct fw_device *device = | |
765 | container_of(work, struct fw_device, work.work); | |
766 | ||
767 | fw_device_cdev_update(device); | |
768 | device_for_each_child(&device->device, NULL, update_unit); | |
769 | } | |
3d36a0df | 770 | |
c781c06d | 771 | /* |
3d36a0df SR |
772 | * If a device was pending for deletion because its node went away but its |
773 | * bus info block and root directory header matches that of a newly discovered | |
774 | * device, revive the existing fw_device. | |
775 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 776 | */ |
3d36a0df SR |
777 | static int lookup_existing_device(struct device *dev, void *data) |
778 | { | |
779 | struct fw_device *old = fw_device(dev); | |
780 | struct fw_device *new = data; | |
781 | struct fw_card *card = new->card; | |
782 | int match = 0; | |
783 | ||
784 | down_read(&fw_device_rwsem); /* serialize config_rom access */ | |
785 | spin_lock_irq(&card->lock); /* serialize node access */ | |
786 | ||
787 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
788 | atomic_cmpxchg(&old->state, | |
789 | FW_DEVICE_GONE, | |
790 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
791 | struct fw_node *current_node = new->node; | |
792 | struct fw_node *obsolete_node = old->node; | |
793 | ||
794 | new->node = obsolete_node; | |
795 | new->node->data = new; | |
796 | old->node = current_node; | |
797 | old->node->data = old; | |
798 | ||
799 | old->max_speed = new->max_speed; | |
800 | old->node_id = current_node->node_id; | |
801 | smp_wmb(); /* update node_id before generation */ | |
802 | old->generation = card->generation; | |
803 | old->config_rom_retries = 0; | |
804 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 805 | |
3d36a0df SR |
806 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
807 | schedule_delayed_work(&old->work, 0); | |
808 | ||
809 | if (current_node == card->root_node) | |
810 | fw_schedule_bm_work(card, 0); | |
811 | ||
812 | match = 1; | |
813 | } | |
814 | ||
815 | spin_unlock_irq(&card->lock); | |
816 | up_read(&fw_device_rwsem); | |
817 | ||
818 | return match; | |
819 | } | |
19a15b93 | 820 | |
7889b60e SR |
821 | enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; |
822 | ||
823 | void fw_device_set_broadcast_channel(struct fw_device *device, int generation) | |
824 | { | |
825 | struct fw_card *card = device->card; | |
826 | __be32 data; | |
827 | int rcode; | |
828 | ||
829 | if (!card->broadcast_channel_allocated) | |
830 | return; | |
831 | ||
832 | if (device->bc_implemented == BC_UNKNOWN) { | |
833 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, | |
834 | device->node_id, generation, device->max_speed, | |
835 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
836 | &data, 4); | |
837 | switch (rcode) { | |
838 | case RCODE_COMPLETE: | |
839 | if (data & cpu_to_be32(1 << 31)) { | |
840 | device->bc_implemented = BC_IMPLEMENTED; | |
841 | break; | |
842 | } | |
843 | /* else fall through to case address error */ | |
844 | case RCODE_ADDRESS_ERROR: | |
845 | device->bc_implemented = BC_UNIMPLEMENTED; | |
846 | } | |
847 | } | |
848 | ||
849 | if (device->bc_implemented == BC_IMPLEMENTED) { | |
850 | data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | | |
851 | BROADCAST_CHANNEL_VALID); | |
852 | fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, | |
853 | device->node_id, generation, device->max_speed, | |
854 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
855 | &data, 4); | |
856 | } | |
857 | } | |
858 | ||
19a15b93 KH |
859 | static void fw_device_init(struct work_struct *work) |
860 | { | |
19a15b93 KH |
861 | struct fw_device *device = |
862 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 863 | struct device *revived_dev; |
e1eff7a3 | 864 | int minor, ret; |
19a15b93 | 865 | |
c781c06d KH |
866 | /* |
867 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 868 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
869 | * device. |
870 | */ | |
19a15b93 | 871 | |
f8d2dc39 | 872 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
873 | if (device->config_rom_retries < MAX_RETRIES && |
874 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
875 | device->config_rom_retries++; |
876 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
877 | } else { | |
907293d7 | 878 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 879 | device->node_id); |
931c4834 | 880 | if (device->node == device->card->root_node) |
0fa1986f | 881 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
882 | fw_device_release(&device->device); |
883 | } | |
884 | return; | |
885 | } | |
886 | ||
3d36a0df SR |
887 | revived_dev = device_find_child(device->card->device, |
888 | device, lookup_existing_device); | |
889 | if (revived_dev) { | |
890 | put_device(revived_dev); | |
891 | fw_device_release(&device->device); | |
892 | ||
893 | return; | |
894 | } | |
895 | ||
62305823 | 896 | device_initialize(&device->device); |
96b19062 SR |
897 | |
898 | fw_device_get(device); | |
c9755e14 | 899 | down_write(&fw_device_rwsem); |
e1eff7a3 | 900 | ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
62305823 SR |
901 | idr_get_new(&fw_device_idr, device, &minor) : |
902 | -ENOMEM; | |
c9755e14 | 903 | up_write(&fw_device_rwsem); |
96b19062 | 904 | |
e1eff7a3 | 905 | if (ret < 0) |
a3aca3da KH |
906 | goto error; |
907 | ||
19a15b93 | 908 | device->device.bus = &fw_bus_type; |
21351dbe | 909 | device->device.type = &fw_device_type; |
19a15b93 | 910 | device->device.parent = device->card->device; |
a3aca3da | 911 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 912 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 913 | |
e5333db9 SR |
914 | BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) < |
915 | ARRAY_SIZE(fw_device_attributes) + | |
916 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
917 | init_fw_attribute_group(&device->device, |
918 | fw_device_attributes, | |
919 | &device->attribute_group); | |
e5333db9 | 920 | |
19a15b93 KH |
921 | if (device_add(&device->device)) { |
922 | fw_error("Failed to add device.\n"); | |
a3aca3da | 923 | goto error_with_cdev; |
19a15b93 KH |
924 | } |
925 | ||
19a15b93 KH |
926 | create_units(device); |
927 | ||
c781c06d KH |
928 | /* |
929 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
930 | * out from under us while we did the intialization work, we |
931 | * have to shut down the device again here. Normally, though, | |
932 | * fw_node_event will be responsible for shutting it down when | |
933 | * necessary. We have to use the atomic cmpxchg here to avoid | |
934 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
935 | * fw_node_event(). |
936 | */ | |
641f8791 | 937 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
938 | FW_DEVICE_INITIALIZING, |
939 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
940 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
941 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
fa6e697b SR |
942 | } else { |
943 | if (device->config_rom_retries) | |
944 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
945 | "%d config ROM retries\n", | |
a1f64819 | 946 | dev_name(&device->device), |
fa6e697b SR |
947 | device->config_rom[3], device->config_rom[4], |
948 | 1 << device->max_speed, | |
949 | device->config_rom_retries); | |
950 | else | |
951 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 952 | dev_name(&device->device), |
fa6e697b SR |
953 | device->config_rom[3], device->config_rom[4], |
954 | 1 << device->max_speed); | |
c9755e14 | 955 | device->config_rom_retries = 0; |
7889b60e SR |
956 | |
957 | fw_device_set_broadcast_channel(device, device->generation); | |
fa6e697b | 958 | } |
19a15b93 | 959 | |
c781c06d KH |
960 | /* |
961 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
962 | * root node config rom. If this races with a bus reset we |
963 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
964 | * pretty harmless. |
965 | */ | |
19a15b93 | 966 | if (device->node == device->card->root_node) |
0fa1986f | 967 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
968 | |
969 | return; | |
970 | ||
a3aca3da | 971 | error_with_cdev: |
c9755e14 | 972 | down_write(&fw_device_rwsem); |
a3aca3da | 973 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 974 | up_write(&fw_device_rwsem); |
373b2edd | 975 | error: |
96b19062 SR |
976 | fw_device_put(device); /* fw_device_idr's reference */ |
977 | ||
978 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
979 | } |
980 | ||
c9755e14 SR |
981 | enum { |
982 | REREAD_BIB_ERROR, | |
983 | REREAD_BIB_GONE, | |
984 | REREAD_BIB_UNCHANGED, | |
985 | REREAD_BIB_CHANGED, | |
986 | }; | |
987 | ||
988 | /* Reread and compare bus info block and header of root directory */ | |
989 | static int reread_bus_info_block(struct fw_device *device, int generation) | |
990 | { | |
991 | u32 q; | |
992 | int i; | |
993 | ||
994 | for (i = 0; i < 6; i++) { | |
995 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
996 | return REREAD_BIB_ERROR; | |
997 | ||
998 | if (i == 0 && q == 0) | |
999 | return REREAD_BIB_GONE; | |
1000 | ||
d01b0178 | 1001 | if (q != device->config_rom[i]) |
c9755e14 SR |
1002 | return REREAD_BIB_CHANGED; |
1003 | } | |
1004 | ||
1005 | return REREAD_BIB_UNCHANGED; | |
1006 | } | |
1007 | ||
1008 | static void fw_device_refresh(struct work_struct *work) | |
1009 | { | |
1010 | struct fw_device *device = | |
1011 | container_of(work, struct fw_device, work.work); | |
1012 | struct fw_card *card = device->card; | |
1013 | int node_id = device->node_id; | |
1014 | ||
1015 | switch (reread_bus_info_block(device, device->generation)) { | |
1016 | case REREAD_BIB_ERROR: | |
1017 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
1018 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1019 | device->config_rom_retries++; | |
1020 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
1021 | ||
1022 | return; | |
1023 | } | |
1024 | goto give_up; | |
1025 | ||
1026 | case REREAD_BIB_GONE: | |
1027 | goto gone; | |
1028 | ||
1029 | case REREAD_BIB_UNCHANGED: | |
1030 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
1031 | FW_DEVICE_INITIALIZING, |
1032 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1033 | goto gone; |
1034 | ||
1035 | fw_device_update(work); | |
1036 | device->config_rom_retries = 0; | |
1037 | goto out; | |
1038 | ||
1039 | case REREAD_BIB_CHANGED: | |
1040 | break; | |
1041 | } | |
1042 | ||
1043 | /* | |
1044 | * Something changed. We keep things simple and don't investigate | |
1045 | * further. We just destroy all previous units and create new ones. | |
1046 | */ | |
1047 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
1048 | ||
1049 | if (read_bus_info_block(device, device->generation) < 0) { | |
1050 | if (device->config_rom_retries < MAX_RETRIES && | |
1051 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1052 | device->config_rom_retries++; | |
1053 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
1054 | ||
1055 | return; | |
1056 | } | |
1057 | goto give_up; | |
1058 | } | |
1059 | ||
1060 | create_units(device); | |
1061 | ||
0210b66d SR |
1062 | /* Userspace may want to re-read attributes. */ |
1063 | kobject_uevent(&device->device.kobj, KOBJ_CHANGE); | |
1064 | ||
c9755e14 | 1065 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1066 | FW_DEVICE_INITIALIZING, |
1067 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1068 | goto gone; |
1069 | ||
a1f64819 | 1070 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
1071 | device->config_rom_retries = 0; |
1072 | goto out; | |
1073 | ||
1074 | give_up: | |
a1f64819 | 1075 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 1076 | gone: |
3d36a0df SR |
1077 | atomic_set(&device->state, FW_DEVICE_GONE); |
1078 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
1079 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
c9755e14 SR |
1080 | out: |
1081 | if (node_id == card->root_node->node_id) | |
0fa1986f | 1082 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
1083 | } |
1084 | ||
19a15b93 KH |
1085 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
1086 | { | |
1087 | struct fw_device *device; | |
1088 | ||
19a15b93 KH |
1089 | switch (event) { |
1090 | case FW_NODE_CREATED: | |
1091 | case FW_NODE_LINK_ON: | |
1092 | if (!node->link_on) | |
1093 | break; | |
c9755e14 | 1094 | create: |
19a15b93 KH |
1095 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
1096 | if (device == NULL) | |
1097 | break; | |
1098 | ||
c781c06d KH |
1099 | /* |
1100 | * Do minimal intialization of the device here, the | |
62305823 SR |
1101 | * rest will happen in fw_device_init(). |
1102 | * | |
1103 | * Attention: A lot of things, even fw_device_get(), | |
1104 | * cannot be done before fw_device_init() finished! | |
1105 | * You can basically just check device->state and | |
1106 | * schedule work until then, but only while holding | |
1107 | * card->lock. | |
c781c06d | 1108 | */ |
641f8791 | 1109 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1110 | device->card = fw_card_get(card); |
19a15b93 KH |
1111 | device->node = fw_node_get(node); |
1112 | device->node_id = node->node_id; | |
1113 | device->generation = card->generation; | |
92368890 | 1114 | device->is_local = node == card->local_node; |
d67cfb96 | 1115 | mutex_init(&device->client_list_mutex); |
97bd9efa | 1116 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1117 | |
c781c06d KH |
1118 | /* |
1119 | * Set the node data to point back to this device so | |
19a15b93 | 1120 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1121 | * and generation for the device. |
1122 | */ | |
19a15b93 KH |
1123 | node->data = device; |
1124 | ||
c781c06d KH |
1125 | /* |
1126 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1127 | * especially if they are bus powered and go through |
1128 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1129 | * first config rom scan half a second after bus reset. |
1130 | */ | |
19a15b93 KH |
1131 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1132 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
1133 | break; | |
1134 | ||
c9755e14 SR |
1135 | case FW_NODE_INITIATED_RESET: |
1136 | device = node->data; | |
1137 | if (device == NULL) | |
1138 | goto create; | |
1139 | ||
1140 | device->node_id = node->node_id; | |
1141 | smp_wmb(); /* update node_id before generation */ | |
1142 | device->generation = card->generation; | |
1143 | if (atomic_cmpxchg(&device->state, | |
1144 | FW_DEVICE_RUNNING, | |
1145 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1146 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
1147 | schedule_delayed_work(&device->work, | |
92368890 | 1148 | device->is_local ? 0 : INITIAL_DELAY); |
c9755e14 SR |
1149 | } |
1150 | break; | |
1151 | ||
19a15b93 KH |
1152 | case FW_NODE_UPDATED: |
1153 | if (!node->link_on || node->data == NULL) | |
1154 | break; | |
1155 | ||
1156 | device = node->data; | |
1157 | device->node_id = node->node_id; | |
b5d2a5e0 | 1158 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1159 | device->generation = card->generation; |
5f480477 KH |
1160 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1161 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
1162 | schedule_delayed_work(&device->work, 0); | |
1163 | } | |
19a15b93 KH |
1164 | break; |
1165 | ||
1166 | case FW_NODE_DESTROYED: | |
1167 | case FW_NODE_LINK_OFF: | |
1168 | if (!node->data) | |
1169 | break; | |
1170 | ||
c781c06d KH |
1171 | /* |
1172 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1173 | * are two cases here: either the device is fully |
1174 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1175 | * process of reading its config rom | |
1176 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1177 | * initialized we can reuse device->work to schedule a | |
1178 | * full fw_device_shutdown(). If not, there's work | |
1179 | * scheduled to read it's config rom, and we just put | |
1180 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1181 | * to create the device. |
1182 | */ | |
19a15b93 | 1183 | device = node->data; |
641f8791 | 1184 | if (atomic_xchg(&device->state, |
3d36a0df | 1185 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1186 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
e747a5c0 SR |
1187 | schedule_delayed_work(&device->work, |
1188 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); | |
19a15b93 KH |
1189 | } |
1190 | break; | |
1191 | } | |
1192 | } |