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> | |
77c9a5da SR |
25 | #include <linux/firewire.h> |
26 | #include <linux/firewire-constants.h> | |
a3aca3da | 27 | #include <linux/idr.h> |
3d36a0df | 28 | #include <linux/jiffies.h> |
41f321c2 SR |
29 | #include <linux/kobject.h> |
30 | #include <linux/list.h> | |
b3b29888 | 31 | #include <linux/mod_devicetable.h> |
e8ca9702 | 32 | #include <linux/module.h> |
d67cfb96 | 33 | #include <linux/mutex.h> |
6188e10d MW |
34 | #include <linux/rwsem.h> |
35 | #include <linux/semaphore.h> | |
cf417e54 | 36 | #include <linux/spinlock.h> |
41f321c2 SR |
37 | #include <linux/string.h> |
38 | #include <linux/workqueue.h> | |
39 | ||
e8ca9702 SR |
40 | #include <asm/atomic.h> |
41 | #include <asm/byteorder.h> | |
b5d2a5e0 | 42 | #include <asm/system.h> |
41f321c2 | 43 | |
77c9a5da | 44 | #include "core.h" |
19a15b93 KH |
45 | |
46 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
47 | { | |
48 | ci->p = p + 1; | |
49 | ci->end = ci->p + (p[0] >> 16); | |
50 | } | |
19a15b93 KH |
51 | EXPORT_SYMBOL(fw_csr_iterator_init); |
52 | ||
53 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
54 | { | |
55 | *key = *ci->p >> 24; | |
56 | *value = *ci->p & 0xffffff; | |
57 | ||
58 | return ci->p++ < ci->end; | |
59 | } | |
19a15b93 KH |
60 | EXPORT_SYMBOL(fw_csr_iterator_next); |
61 | ||
099d5414 | 62 | static bool is_fw_unit(struct device *dev); |
19a15b93 | 63 | |
e41f8d70 | 64 | static int match_unit_directory(u32 *directory, u32 match_flags, |
b3b29888 | 65 | const struct ieee1394_device_id *id) |
19a15b93 KH |
66 | { |
67 | struct fw_csr_iterator ci; | |
68 | int key, value, match; | |
69 | ||
70 | match = 0; | |
71 | fw_csr_iterator_init(&ci, directory); | |
72 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
b3b29888 SR |
73 | if (key == CSR_VENDOR && value == id->vendor_id) |
74 | match |= IEEE1394_MATCH_VENDOR_ID; | |
75 | if (key == CSR_MODEL && value == id->model_id) | |
76 | match |= IEEE1394_MATCH_MODEL_ID; | |
19a15b93 | 77 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) |
b3b29888 | 78 | match |= IEEE1394_MATCH_SPECIFIER_ID; |
19a15b93 | 79 | if (key == CSR_VERSION && value == id->version) |
b3b29888 | 80 | match |= IEEE1394_MATCH_VERSION; |
19a15b93 KH |
81 | } |
82 | ||
e41f8d70 | 83 | return (match & match_flags) == match_flags; |
19a15b93 KH |
84 | } |
85 | ||
86 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
87 | { | |
88 | struct fw_unit *unit = fw_unit(dev); | |
e41f8d70 SR |
89 | struct fw_device *device; |
90 | const struct ieee1394_device_id *id; | |
19a15b93 KH |
91 | |
92 | /* We only allow binding to fw_units. */ | |
93 | if (!is_fw_unit(dev)) | |
94 | return 0; | |
95 | ||
e5110d01 | 96 | device = fw_parent_device(unit); |
77c9a5da | 97 | id = container_of(drv, struct fw_driver, driver)->id_table; |
e41f8d70 | 98 | |
77c9a5da | 99 | for (; id->match_flags != 0; id++) { |
e41f8d70 SR |
100 | if (match_unit_directory(unit->directory, id->match_flags, id)) |
101 | return 1; | |
102 | ||
103 | /* Also check vendor ID in the root directory. */ | |
104 | if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) && | |
105 | match_unit_directory(&device->config_rom[5], | |
106 | IEEE1394_MATCH_VENDOR_ID, id) && | |
107 | match_unit_directory(unit->directory, id->match_flags | |
108 | & ~IEEE1394_MATCH_VENDOR_ID, id)) | |
19a15b93 KH |
109 | return 1; |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
116 | { | |
e5110d01 | 117 | struct fw_device *device = fw_parent_device(unit); |
19a15b93 KH |
118 | struct fw_csr_iterator ci; |
119 | ||
120 | int key, value; | |
121 | int vendor = 0; | |
122 | int model = 0; | |
123 | int specifier_id = 0; | |
124 | int version = 0; | |
125 | ||
126 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
127 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
128 | switch (key) { | |
129 | case CSR_VENDOR: | |
130 | vendor = value; | |
131 | break; | |
132 | case CSR_MODEL: | |
133 | model = value; | |
134 | break; | |
135 | } | |
136 | } | |
137 | ||
138 | fw_csr_iterator_init(&ci, unit->directory); | |
139 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
140 | switch (key) { | |
141 | case CSR_SPECIFIER_ID: | |
142 | specifier_id = value; | |
143 | break; | |
144 | case CSR_VERSION: | |
145 | version = value; | |
146 | break; | |
147 | } | |
148 | } | |
149 | ||
150 | return snprintf(buffer, buffer_size, | |
151 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
152 | vendor, model, specifier_id, version); | |
153 | } | |
154 | ||
53dca511 | 155 | static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
156 | { |
157 | struct fw_unit *unit = fw_unit(dev); | |
158 | char modalias[64]; | |
19a15b93 | 159 | |
2d826cc5 | 160 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 161 | |
7eff2e7a | 162 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
163 | return -ENOMEM; |
164 | ||
19a15b93 KH |
165 | return 0; |
166 | } | |
167 | ||
168 | struct bus_type fw_bus_type = { | |
362c2c8c | 169 | .name = "firewire", |
19a15b93 | 170 | .match = fw_unit_match, |
19a15b93 | 171 | }; |
19a15b93 KH |
172 | EXPORT_SYMBOL(fw_bus_type); |
173 | ||
19a15b93 KH |
174 | int fw_device_enable_phys_dma(struct fw_device *device) |
175 | { | |
b5d2a5e0 SR |
176 | int generation = device->generation; |
177 | ||
178 | /* device->node_id, accessed below, must not be older than generation */ | |
179 | smp_rmb(); | |
180 | ||
19a15b93 KH |
181 | return device->card->driver->enable_phys_dma(device->card, |
182 | device->node_id, | |
b5d2a5e0 | 183 | generation); |
19a15b93 | 184 | } |
19a15b93 KH |
185 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
186 | ||
7feb9cce KH |
187 | struct config_rom_attribute { |
188 | struct device_attribute attr; | |
189 | u32 key; | |
190 | }; | |
191 | ||
53dca511 SR |
192 | static ssize_t show_immediate(struct device *dev, |
193 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
194 | { |
195 | struct config_rom_attribute *attr = | |
196 | container_of(dattr, struct config_rom_attribute, attr); | |
197 | struct fw_csr_iterator ci; | |
198 | u32 *dir; | |
c9755e14 SR |
199 | int key, value, ret = -ENOENT; |
200 | ||
201 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
202 | |
203 | if (is_fw_unit(dev)) | |
204 | dir = fw_unit(dev)->directory; | |
205 | else | |
206 | dir = fw_device(dev)->config_rom + 5; | |
207 | ||
208 | fw_csr_iterator_init(&ci, dir); | |
209 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
210 | if (attr->key == key) { |
211 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
212 | "0x%06x\n", value); | |
213 | break; | |
214 | } | |
215 | ||
216 | up_read(&fw_device_rwsem); | |
7feb9cce | 217 | |
c9755e14 | 218 | return ret; |
7feb9cce KH |
219 | } |
220 | ||
221 | #define IMMEDIATE_ATTR(name, key) \ | |
222 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
223 | ||
53dca511 SR |
224 | static ssize_t show_text_leaf(struct device *dev, |
225 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
226 | { |
227 | struct config_rom_attribute *attr = | |
228 | container_of(dattr, struct config_rom_attribute, attr); | |
229 | struct fw_csr_iterator ci; | |
230 | u32 *dir, *block = NULL, *p, *end; | |
c9755e14 | 231 | int length, key, value, last_key = 0, ret = -ENOENT; |
7feb9cce KH |
232 | char *b; |
233 | ||
c9755e14 SR |
234 | down_read(&fw_device_rwsem); |
235 | ||
7feb9cce KH |
236 | if (is_fw_unit(dev)) |
237 | dir = fw_unit(dev)->directory; | |
238 | else | |
239 | dir = fw_device(dev)->config_rom + 5; | |
240 | ||
241 | fw_csr_iterator_init(&ci, dir); | |
242 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
243 | if (attr->key == last_key && | |
244 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
245 | block = ci.p - 1 + value; | |
246 | last_key = key; | |
247 | } | |
248 | ||
249 | if (block == NULL) | |
c9755e14 | 250 | goto out; |
7feb9cce KH |
251 | |
252 | length = min(block[0] >> 16, 256U); | |
253 | if (length < 3) | |
c9755e14 | 254 | goto out; |
7feb9cce KH |
255 | |
256 | if (block[1] != 0 || block[2] != 0) | |
257 | /* Unknown encoding. */ | |
c9755e14 | 258 | goto out; |
7feb9cce | 259 | |
c9755e14 SR |
260 | if (buf == NULL) { |
261 | ret = length * 4; | |
262 | goto out; | |
263 | } | |
7feb9cce KH |
264 | |
265 | b = buf; | |
266 | end = &block[length + 1]; | |
267 | for (p = &block[3]; p < end; p++, b += 4) | |
268 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
269 | ||
270 | /* Strip trailing whitespace and add newline. */ | |
271 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
272 | strcpy(b + 1, "\n"); | |
c9755e14 SR |
273 | ret = b + 2 - buf; |
274 | out: | |
275 | up_read(&fw_device_rwsem); | |
7feb9cce | 276 | |
c9755e14 | 277 | return ret; |
7feb9cce KH |
278 | } |
279 | ||
280 | #define TEXT_LEAF_ATTR(name, key) \ | |
281 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
282 | ||
283 | static struct config_rom_attribute config_rom_attributes[] = { | |
284 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
285 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
286 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
287 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
288 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
289 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
290 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
291 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
292 | }; | |
293 | ||
53dca511 SR |
294 | static void init_fw_attribute_group(struct device *dev, |
295 | struct device_attribute *attrs, | |
296 | struct fw_attribute_group *group) | |
7feb9cce KH |
297 | { |
298 | struct device_attribute *attr; | |
6f2e53d5 KH |
299 | int i, j; |
300 | ||
301 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
302 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
303 | |
304 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
305 | attr = &config_rom_attributes[i].attr; | |
306 | if (attr->show(dev, attr, NULL) < 0) | |
307 | continue; | |
6f2e53d5 | 308 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
309 | } |
310 | ||
e5333db9 | 311 | group->attrs[j] = NULL; |
6f2e53d5 KH |
312 | group->groups[0] = &group->group; |
313 | group->groups[1] = NULL; | |
314 | group->group.attrs = group->attrs; | |
a4dbd674 | 315 | dev->groups = (const struct attribute_group **) group->groups; |
7feb9cce KH |
316 | } |
317 | ||
53dca511 SR |
318 | static ssize_t modalias_show(struct device *dev, |
319 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
320 | { |
321 | struct fw_unit *unit = fw_unit(dev); | |
322 | int length; | |
323 | ||
324 | length = get_modalias(unit, buf, PAGE_SIZE); | |
325 | strcpy(buf + length, "\n"); | |
326 | ||
327 | return length + 1; | |
328 | } | |
329 | ||
53dca511 SR |
330 | static ssize_t rom_index_show(struct device *dev, |
331 | struct device_attribute *attr, char *buf) | |
19a15b93 | 332 | { |
21351dbe KH |
333 | struct fw_device *device = fw_device(dev->parent); |
334 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 335 | |
21351dbe KH |
336 | return snprintf(buf, PAGE_SIZE, "%d\n", |
337 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
338 | } |
339 | ||
21351dbe KH |
340 | static struct device_attribute fw_unit_attributes[] = { |
341 | __ATTR_RO(modalias), | |
342 | __ATTR_RO(rom_index), | |
343 | __ATTR_NULL, | |
19a15b93 KH |
344 | }; |
345 | ||
53dca511 SR |
346 | static ssize_t config_rom_show(struct device *dev, |
347 | struct device_attribute *attr, char *buf) | |
048961ef | 348 | { |
21351dbe | 349 | struct fw_device *device = fw_device(dev); |
c9755e14 | 350 | size_t length; |
048961ef | 351 | |
c9755e14 SR |
352 | down_read(&fw_device_rwsem); |
353 | length = device->config_rom_length * 4; | |
354 | memcpy(buf, device->config_rom, length); | |
355 | up_read(&fw_device_rwsem); | |
21351dbe | 356 | |
c9755e14 | 357 | return length; |
048961ef KH |
358 | } |
359 | ||
53dca511 SR |
360 | static ssize_t guid_show(struct device *dev, |
361 | struct device_attribute *attr, char *buf) | |
bbd14945 KH |
362 | { |
363 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
364 | int ret; |
365 | ||
366 | down_read(&fw_device_rwsem); | |
367 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
368 | device->config_rom[3], device->config_rom[4]); | |
369 | up_read(&fw_device_rwsem); | |
bbd14945 | 370 | |
c9755e14 | 371 | return ret; |
bbd14945 KH |
372 | } |
373 | ||
0210b66d SR |
374 | static int units_sprintf(char *buf, u32 *directory) |
375 | { | |
376 | struct fw_csr_iterator ci; | |
377 | int key, value; | |
378 | int specifier_id = 0; | |
379 | int version = 0; | |
380 | ||
381 | fw_csr_iterator_init(&ci, directory); | |
382 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
383 | switch (key) { | |
384 | case CSR_SPECIFIER_ID: | |
385 | specifier_id = value; | |
386 | break; | |
387 | case CSR_VERSION: | |
388 | version = value; | |
389 | break; | |
390 | } | |
391 | } | |
392 | ||
393 | return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version); | |
394 | } | |
395 | ||
396 | static ssize_t units_show(struct device *dev, | |
397 | struct device_attribute *attr, char *buf) | |
398 | { | |
399 | struct fw_device *device = fw_device(dev); | |
400 | struct fw_csr_iterator ci; | |
401 | int key, value, i = 0; | |
402 | ||
403 | down_read(&fw_device_rwsem); | |
404 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
405 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
406 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
407 | continue; | |
408 | i += units_sprintf(&buf[i], ci.p + value - 1); | |
409 | if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) | |
410 | break; | |
411 | } | |
412 | up_read(&fw_device_rwsem); | |
413 | ||
414 | if (i) | |
415 | buf[i - 1] = '\n'; | |
416 | ||
417 | return i; | |
418 | } | |
419 | ||
21351dbe KH |
420 | static struct device_attribute fw_device_attributes[] = { |
421 | __ATTR_RO(config_rom), | |
bbd14945 | 422 | __ATTR_RO(guid), |
0210b66d | 423 | __ATTR_RO(units), |
21351dbe | 424 | __ATTR_NULL, |
048961ef KH |
425 | }; |
426 | ||
53dca511 SR |
427 | static int read_rom(struct fw_device *device, |
428 | int generation, int index, u32 *data) | |
19a15b93 | 429 | { |
1e119fa9 | 430 | int rcode; |
b5d2a5e0 SR |
431 | |
432 | /* device->node_id, accessed below, must not be older than generation */ | |
433 | smp_rmb(); | |
19a15b93 | 434 | |
1e119fa9 | 435 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 436 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
437 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
438 | data, 4); | |
439 | be32_to_cpus(data); | |
19a15b93 | 440 | |
1e119fa9 | 441 | return rcode; |
19a15b93 KH |
442 | } |
443 | ||
1dadff71 SR |
444 | #define READ_BIB_ROM_SIZE 256 |
445 | #define READ_BIB_STACK_SIZE 16 | |
446 | ||
f8d2dc39 SR |
447 | /* |
448 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
449 | * the config ROM. We do all this with a cached bus generation. If the bus | |
450 | * generation changes under us, read_bus_info_block will fail and get retried. | |
451 | * It's better to start all over in this case because the node from which we | |
452 | * are reading the ROM may have changed the ROM during the reset. | |
453 | */ | |
454 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 455 | { |
c9755e14 | 456 | u32 *rom, *stack, *old_rom, *new_rom; |
1dadff71 SR |
457 | u32 sp, key; |
458 | int i, end, length, ret = -1; | |
459 | ||
460 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
461 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
462 | if (rom == NULL) | |
463 | return -ENOMEM; | |
464 | ||
465 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 466 | |
f1397490 SR |
467 | device->max_speed = SCODE_100; |
468 | ||
19a15b93 KH |
469 | /* First read the bus info block. */ |
470 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 471 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 472 | goto out; |
c781c06d KH |
473 | /* |
474 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
475 | * reply with a 0 for the first quadlet of the config |
476 | * rom to indicate that they are booting (for example, | |
477 | * if the firmware is on the disk of a external | |
478 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
479 | * retry mechanism will try again later. |
480 | */ | |
19a15b93 | 481 | if (i == 0 && rom[i] == 0) |
1dadff71 | 482 | goto out; |
19a15b93 KH |
483 | } |
484 | ||
f1397490 SR |
485 | device->max_speed = device->node->max_speed; |
486 | ||
487 | /* | |
488 | * Determine the speed of | |
489 | * - devices with link speed less than PHY speed, | |
490 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
491 | * - all devices if there are 1394b repeaters. | |
492 | * Note, we cannot use the bus info block's link_spd as starting point | |
493 | * because some buggy firmwares set it lower than necessary and because | |
494 | * 1394-1995 nodes do not have the field. | |
495 | */ | |
496 | if ((rom[2] & 0x7) < device->max_speed || | |
497 | device->max_speed == SCODE_BETA || | |
498 | device->card->beta_repeaters_present) { | |
499 | u32 dummy; | |
500 | ||
501 | /* for S1600 and S3200 */ | |
502 | if (device->max_speed == SCODE_BETA) | |
503 | device->max_speed = device->card->link_speed; | |
504 | ||
505 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
506 | if (read_rom(device, generation, 0, &dummy) == |
507 | RCODE_COMPLETE) | |
f1397490 SR |
508 | break; |
509 | device->max_speed--; | |
510 | } | |
511 | } | |
512 | ||
c781c06d KH |
513 | /* |
514 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
515 | * directory structure so we parse it using a stack of |
516 | * references to the blocks that make up the structure. We | |
517 | * push a reference to the root directory on the stack to | |
c781c06d KH |
518 | * start things off. |
519 | */ | |
19a15b93 KH |
520 | length = i; |
521 | sp = 0; | |
522 | stack[sp++] = 0xc0000005; | |
523 | while (sp > 0) { | |
c781c06d KH |
524 | /* |
525 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
526 | * lower 24 bits is the offset into the config rom, |
527 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
528 | * block. |
529 | */ | |
19a15b93 KH |
530 | key = stack[--sp]; |
531 | i = key & 0xffffff; | |
1dadff71 | 532 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
533 | /* |
534 | * The reference points outside the standard | |
535 | * config rom area, something's fishy. | |
536 | */ | |
1dadff71 | 537 | goto out; |
19a15b93 KH |
538 | |
539 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 540 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 541 | goto out; |
19a15b93 KH |
542 | end = i + (rom[i] >> 16) + 1; |
543 | i++; | |
1dadff71 | 544 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
545 | /* |
546 | * This block extends outside standard config | |
19a15b93 KH |
547 | * area (and the array we're reading it |
548 | * into). That's broken, so ignore this | |
c781c06d KH |
549 | * device. |
550 | */ | |
1dadff71 | 551 | goto out; |
19a15b93 | 552 | |
c781c06d KH |
553 | /* |
554 | * Now read in the block. If this is a directory | |
19a15b93 | 555 | * block, check the entries as we read them to see if |
c781c06d KH |
556 | * it references another block, and push it in that case. |
557 | */ | |
19a15b93 | 558 | while (i < end) { |
f8d2dc39 SR |
559 | if (read_rom(device, generation, i, &rom[i]) != |
560 | RCODE_COMPLETE) | |
1dadff71 | 561 | goto out; |
19a15b93 | 562 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 563 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
564 | stack[sp++] = i + rom[i]; |
565 | i++; | |
566 | } | |
567 | if (length < i) | |
568 | length = i; | |
569 | } | |
570 | ||
c9755e14 SR |
571 | old_rom = device->config_rom; |
572 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
573 | if (new_rom == NULL) | |
1dadff71 | 574 | goto out; |
c9755e14 SR |
575 | |
576 | down_write(&fw_device_rwsem); | |
577 | device->config_rom = new_rom; | |
19a15b93 | 578 | device->config_rom_length = length; |
c9755e14 SR |
579 | up_write(&fw_device_rwsem); |
580 | ||
581 | kfree(old_rom); | |
1dadff71 | 582 | ret = 0; |
837ec787 SR |
583 | device->max_rec = rom[2] >> 12 & 0xf; |
584 | device->cmc = rom[2] >> 30 & 1; | |
585 | device->irmc = rom[2] >> 31 & 1; | |
1dadff71 SR |
586 | out: |
587 | kfree(rom); | |
19a15b93 | 588 | |
1dadff71 | 589 | return ret; |
19a15b93 KH |
590 | } |
591 | ||
592 | static void fw_unit_release(struct device *dev) | |
593 | { | |
594 | struct fw_unit *unit = fw_unit(dev); | |
595 | ||
596 | kfree(unit); | |
597 | } | |
598 | ||
21351dbe | 599 | static struct device_type fw_unit_type = { |
21351dbe KH |
600 | .uevent = fw_unit_uevent, |
601 | .release = fw_unit_release, | |
602 | }; | |
603 | ||
099d5414 | 604 | static bool is_fw_unit(struct device *dev) |
19a15b93 | 605 | { |
21351dbe | 606 | return dev->type == &fw_unit_type; |
19a15b93 KH |
607 | } |
608 | ||
609 | static void create_units(struct fw_device *device) | |
610 | { | |
611 | struct fw_csr_iterator ci; | |
612 | struct fw_unit *unit; | |
613 | int key, value, i; | |
614 | ||
615 | i = 0; | |
616 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
617 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
618 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
619 | continue; | |
620 | ||
c781c06d KH |
621 | /* |
622 | * Get the address of the unit directory and try to | |
623 | * match the drivers id_tables against it. | |
624 | */ | |
2d826cc5 | 625 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
626 | if (unit == NULL) { |
627 | fw_error("failed to allocate memory for unit\n"); | |
628 | continue; | |
629 | } | |
630 | ||
631 | unit->directory = ci.p + value - 1; | |
632 | unit->device.bus = &fw_bus_type; | |
21351dbe | 633 | unit->device.type = &fw_unit_type; |
19a15b93 | 634 | unit->device.parent = &device->device; |
a1f64819 | 635 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 636 | |
e5333db9 SR |
637 | BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) < |
638 | ARRAY_SIZE(fw_unit_attributes) + | |
639 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
640 | init_fw_attribute_group(&unit->device, |
641 | fw_unit_attributes, | |
642 | &unit->attribute_group); | |
e5333db9 | 643 | |
7feb9cce KH |
644 | if (device_register(&unit->device) < 0) |
645 | goto skip_unit; | |
646 | ||
7feb9cce KH |
647 | continue; |
648 | ||
7feb9cce KH |
649 | skip_unit: |
650 | kfree(unit); | |
19a15b93 KH |
651 | } |
652 | } | |
653 | ||
654 | static int shutdown_unit(struct device *device, void *data) | |
655 | { | |
21351dbe | 656 | device_unregister(device); |
19a15b93 KH |
657 | |
658 | return 0; | |
659 | } | |
660 | ||
c9755e14 SR |
661 | /* |
662 | * fw_device_rwsem acts as dual purpose mutex: | |
663 | * - serializes accesses to fw_device_idr, | |
664 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
665 | * fw_unit.directory, unless those accesses happen at safe occasions | |
666 | */ | |
667 | DECLARE_RWSEM(fw_device_rwsem); | |
668 | ||
d6053e08 | 669 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
670 | int fw_cdev_major; |
671 | ||
96b19062 | 672 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
673 | { |
674 | struct fw_device *device; | |
675 | ||
c9755e14 | 676 | down_read(&fw_device_rwsem); |
a3aca3da | 677 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
678 | if (device) |
679 | fw_device_get(device); | |
c9755e14 | 680 | up_read(&fw_device_rwsem); |
a3aca3da KH |
681 | |
682 | return device; | |
683 | } | |
684 | ||
3d36a0df SR |
685 | /* |
686 | * These defines control the retry behavior for reading the config | |
687 | * rom. It shouldn't be necessary to tweak these; if the device | |
688 | * doesn't respond to a config rom read within 10 seconds, it's not | |
689 | * going to respond at all. As for the initial delay, a lot of | |
690 | * devices will be able to respond within half a second after bus | |
691 | * reset. On the other hand, it's not really worth being more | |
692 | * aggressive than that, since it scales pretty well; if 10 devices | |
693 | * are plugged in, they're all getting read within one second. | |
694 | */ | |
695 | ||
696 | #define MAX_RETRIES 10 | |
697 | #define RETRY_DELAY (3 * HZ) | |
698 | #define INITIAL_DELAY (HZ / 2) | |
699 | #define SHUTDOWN_DELAY (2 * HZ) | |
700 | ||
19a15b93 KH |
701 | static void fw_device_shutdown(struct work_struct *work) |
702 | { | |
703 | struct fw_device *device = | |
704 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
705 | int minor = MINOR(device->device.devt); |
706 | ||
e747a5c0 SR |
707 | if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) |
708 | && !list_empty(&device->card->link)) { | |
3d36a0df SR |
709 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); |
710 | return; | |
711 | } | |
712 | ||
713 | if (atomic_cmpxchg(&device->state, | |
714 | FW_DEVICE_GONE, | |
715 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
716 | return; | |
717 | ||
2603bf21 | 718 | fw_device_cdev_remove(device); |
19a15b93 KH |
719 | device_for_each_child(&device->device, NULL, shutdown_unit); |
720 | device_unregister(&device->device); | |
96b19062 | 721 | |
c9755e14 | 722 | down_write(&fw_device_rwsem); |
96b19062 | 723 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 724 | up_write(&fw_device_rwsem); |
3d36a0df | 725 | |
96b19062 | 726 | fw_device_put(device); |
19a15b93 KH |
727 | } |
728 | ||
aed80892 SR |
729 | static void fw_device_release(struct device *dev) |
730 | { | |
731 | struct fw_device *device = fw_device(dev); | |
732 | struct fw_card *card = device->card; | |
733 | unsigned long flags; | |
734 | ||
735 | /* | |
736 | * Take the card lock so we don't set this to NULL while a | |
737 | * FW_NODE_UPDATED callback is being handled or while the | |
738 | * bus manager work looks at this node. | |
739 | */ | |
740 | spin_lock_irqsave(&card->lock, flags); | |
741 | device->node->data = NULL; | |
742 | spin_unlock_irqrestore(&card->lock, flags); | |
743 | ||
744 | fw_node_put(device->node); | |
745 | kfree(device->config_rom); | |
746 | kfree(device); | |
747 | fw_card_put(card); | |
748 | } | |
749 | ||
21351dbe | 750 | static struct device_type fw_device_type = { |
aed80892 | 751 | .release = fw_device_release, |
21351dbe KH |
752 | }; |
753 | ||
099d5414 SR |
754 | static bool is_fw_device(struct device *dev) |
755 | { | |
756 | return dev->type == &fw_device_type; | |
757 | } | |
758 | ||
aed80892 SR |
759 | static int update_unit(struct device *dev, void *data) |
760 | { | |
761 | struct fw_unit *unit = fw_unit(dev); | |
762 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
763 | ||
764 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { | |
765 | down(&dev->sem); | |
766 | driver->update(unit); | |
767 | up(&dev->sem); | |
768 | } | |
769 | ||
770 | return 0; | |
771 | } | |
772 | ||
773 | static void fw_device_update(struct work_struct *work) | |
774 | { | |
775 | struct fw_device *device = | |
776 | container_of(work, struct fw_device, work.work); | |
777 | ||
778 | fw_device_cdev_update(device); | |
779 | device_for_each_child(&device->device, NULL, update_unit); | |
780 | } | |
3d36a0df | 781 | |
c781c06d | 782 | /* |
3d36a0df SR |
783 | * If a device was pending for deletion because its node went away but its |
784 | * bus info block and root directory header matches that of a newly discovered | |
785 | * device, revive the existing fw_device. | |
786 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 787 | */ |
3d36a0df SR |
788 | static int lookup_existing_device(struct device *dev, void *data) |
789 | { | |
790 | struct fw_device *old = fw_device(dev); | |
791 | struct fw_device *new = data; | |
792 | struct fw_card *card = new->card; | |
793 | int match = 0; | |
794 | ||
099d5414 SR |
795 | if (!is_fw_device(dev)) |
796 | return 0; | |
797 | ||
3d36a0df SR |
798 | down_read(&fw_device_rwsem); /* serialize config_rom access */ |
799 | spin_lock_irq(&card->lock); /* serialize node access */ | |
800 | ||
801 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
802 | atomic_cmpxchg(&old->state, | |
803 | FW_DEVICE_GONE, | |
804 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
805 | struct fw_node *current_node = new->node; | |
806 | struct fw_node *obsolete_node = old->node; | |
807 | ||
808 | new->node = obsolete_node; | |
809 | new->node->data = new; | |
810 | old->node = current_node; | |
811 | old->node->data = old; | |
812 | ||
813 | old->max_speed = new->max_speed; | |
814 | old->node_id = current_node->node_id; | |
815 | smp_wmb(); /* update node_id before generation */ | |
816 | old->generation = card->generation; | |
817 | old->config_rom_retries = 0; | |
818 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 819 | |
3d36a0df SR |
820 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
821 | schedule_delayed_work(&old->work, 0); | |
822 | ||
823 | if (current_node == card->root_node) | |
824 | fw_schedule_bm_work(card, 0); | |
825 | ||
826 | match = 1; | |
827 | } | |
828 | ||
829 | spin_unlock_irq(&card->lock); | |
830 | up_read(&fw_device_rwsem); | |
831 | ||
832 | return match; | |
833 | } | |
19a15b93 | 834 | |
7889b60e SR |
835 | enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; |
836 | ||
099d5414 | 837 | static void set_broadcast_channel(struct fw_device *device, int generation) |
7889b60e SR |
838 | { |
839 | struct fw_card *card = device->card; | |
840 | __be32 data; | |
841 | int rcode; | |
842 | ||
843 | if (!card->broadcast_channel_allocated) | |
844 | return; | |
845 | ||
837ec787 SR |
846 | /* |
847 | * The Broadcast_Channel Valid bit is required by nodes which want to | |
848 | * transmit on this channel. Such transmissions are practically | |
849 | * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required | |
850 | * to be IRM capable and have a max_rec of 8 or more. We use this fact | |
851 | * to narrow down to which nodes we send Broadcast_Channel updates. | |
852 | */ | |
853 | if (!device->irmc || device->max_rec < 8) | |
854 | return; | |
855 | ||
856 | /* | |
857 | * Some 1394-1995 nodes crash if this 1394a-2000 register is written. | |
858 | * Perform a read test first. | |
859 | */ | |
7889b60e SR |
860 | if (device->bc_implemented == BC_UNKNOWN) { |
861 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, | |
862 | device->node_id, generation, device->max_speed, | |
863 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
864 | &data, 4); | |
865 | switch (rcode) { | |
866 | case RCODE_COMPLETE: | |
867 | if (data & cpu_to_be32(1 << 31)) { | |
868 | device->bc_implemented = BC_IMPLEMENTED; | |
869 | break; | |
870 | } | |
871 | /* else fall through to case address error */ | |
872 | case RCODE_ADDRESS_ERROR: | |
873 | device->bc_implemented = BC_UNIMPLEMENTED; | |
874 | } | |
875 | } | |
876 | ||
877 | if (device->bc_implemented == BC_IMPLEMENTED) { | |
878 | data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | | |
879 | BROADCAST_CHANNEL_VALID); | |
880 | fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, | |
881 | device->node_id, generation, device->max_speed, | |
882 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
883 | &data, 4); | |
884 | } | |
885 | } | |
886 | ||
099d5414 SR |
887 | int fw_device_set_broadcast_channel(struct device *dev, void *gen) |
888 | { | |
889 | if (is_fw_device(dev)) | |
890 | set_broadcast_channel(fw_device(dev), (long)gen); | |
891 | ||
892 | return 0; | |
893 | } | |
894 | ||
19a15b93 KH |
895 | static void fw_device_init(struct work_struct *work) |
896 | { | |
19a15b93 KH |
897 | struct fw_device *device = |
898 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 899 | struct device *revived_dev; |
e1eff7a3 | 900 | int minor, ret; |
19a15b93 | 901 | |
c781c06d KH |
902 | /* |
903 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 904 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
905 | * device. |
906 | */ | |
19a15b93 | 907 | |
f8d2dc39 | 908 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
909 | if (device->config_rom_retries < MAX_RETRIES && |
910 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
911 | device->config_rom_retries++; |
912 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
913 | } else { | |
907293d7 | 914 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 915 | device->node_id); |
931c4834 | 916 | if (device->node == device->card->root_node) |
0fa1986f | 917 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
918 | fw_device_release(&device->device); |
919 | } | |
920 | return; | |
921 | } | |
922 | ||
3d36a0df SR |
923 | revived_dev = device_find_child(device->card->device, |
924 | device, lookup_existing_device); | |
925 | if (revived_dev) { | |
926 | put_device(revived_dev); | |
927 | fw_device_release(&device->device); | |
928 | ||
929 | return; | |
930 | } | |
931 | ||
62305823 | 932 | device_initialize(&device->device); |
96b19062 SR |
933 | |
934 | fw_device_get(device); | |
c9755e14 | 935 | down_write(&fw_device_rwsem); |
e1eff7a3 | 936 | ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
62305823 SR |
937 | idr_get_new(&fw_device_idr, device, &minor) : |
938 | -ENOMEM; | |
c9755e14 | 939 | up_write(&fw_device_rwsem); |
96b19062 | 940 | |
e1eff7a3 | 941 | if (ret < 0) |
a3aca3da KH |
942 | goto error; |
943 | ||
19a15b93 | 944 | device->device.bus = &fw_bus_type; |
21351dbe | 945 | device->device.type = &fw_device_type; |
19a15b93 | 946 | device->device.parent = device->card->device; |
a3aca3da | 947 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 948 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 949 | |
e5333db9 SR |
950 | BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) < |
951 | ARRAY_SIZE(fw_device_attributes) + | |
952 | ARRAY_SIZE(config_rom_attributes)); | |
6f2e53d5 KH |
953 | init_fw_attribute_group(&device->device, |
954 | fw_device_attributes, | |
955 | &device->attribute_group); | |
e5333db9 | 956 | |
19a15b93 KH |
957 | if (device_add(&device->device)) { |
958 | fw_error("Failed to add device.\n"); | |
a3aca3da | 959 | goto error_with_cdev; |
19a15b93 KH |
960 | } |
961 | ||
19a15b93 KH |
962 | create_units(device); |
963 | ||
c781c06d KH |
964 | /* |
965 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
966 | * out from under us while we did the intialization work, we |
967 | * have to shut down the device again here. Normally, though, | |
968 | * fw_node_event will be responsible for shutting it down when | |
969 | * necessary. We have to use the atomic cmpxchg here to avoid | |
970 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
971 | * fw_node_event(). |
972 | */ | |
641f8791 | 973 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
974 | FW_DEVICE_INITIALIZING, |
975 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
976 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
977 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
fa6e697b SR |
978 | } else { |
979 | if (device->config_rom_retries) | |
980 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
981 | "%d config ROM retries\n", | |
a1f64819 | 982 | dev_name(&device->device), |
fa6e697b SR |
983 | device->config_rom[3], device->config_rom[4], |
984 | 1 << device->max_speed, | |
985 | device->config_rom_retries); | |
986 | else | |
987 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 988 | dev_name(&device->device), |
fa6e697b SR |
989 | device->config_rom[3], device->config_rom[4], |
990 | 1 << device->max_speed); | |
c9755e14 | 991 | device->config_rom_retries = 0; |
7889b60e | 992 | |
099d5414 | 993 | set_broadcast_channel(device, device->generation); |
fa6e697b | 994 | } |
19a15b93 | 995 | |
c781c06d KH |
996 | /* |
997 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
998 | * root node config rom. If this races with a bus reset we |
999 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
1000 | * pretty harmless. |
1001 | */ | |
19a15b93 | 1002 | if (device->node == device->card->root_node) |
0fa1986f | 1003 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
1004 | |
1005 | return; | |
1006 | ||
a3aca3da | 1007 | error_with_cdev: |
c9755e14 | 1008 | down_write(&fw_device_rwsem); |
a3aca3da | 1009 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 1010 | up_write(&fw_device_rwsem); |
373b2edd | 1011 | error: |
96b19062 SR |
1012 | fw_device_put(device); /* fw_device_idr's reference */ |
1013 | ||
1014 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
1015 | } |
1016 | ||
c9755e14 SR |
1017 | enum { |
1018 | REREAD_BIB_ERROR, | |
1019 | REREAD_BIB_GONE, | |
1020 | REREAD_BIB_UNCHANGED, | |
1021 | REREAD_BIB_CHANGED, | |
1022 | }; | |
1023 | ||
1024 | /* Reread and compare bus info block and header of root directory */ | |
1025 | static int reread_bus_info_block(struct fw_device *device, int generation) | |
1026 | { | |
1027 | u32 q; | |
1028 | int i; | |
1029 | ||
1030 | for (i = 0; i < 6; i++) { | |
1031 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
1032 | return REREAD_BIB_ERROR; | |
1033 | ||
1034 | if (i == 0 && q == 0) | |
1035 | return REREAD_BIB_GONE; | |
1036 | ||
d01b0178 | 1037 | if (q != device->config_rom[i]) |
c9755e14 SR |
1038 | return REREAD_BIB_CHANGED; |
1039 | } | |
1040 | ||
1041 | return REREAD_BIB_UNCHANGED; | |
1042 | } | |
1043 | ||
1044 | static void fw_device_refresh(struct work_struct *work) | |
1045 | { | |
1046 | struct fw_device *device = | |
1047 | container_of(work, struct fw_device, work.work); | |
1048 | struct fw_card *card = device->card; | |
1049 | int node_id = device->node_id; | |
1050 | ||
1051 | switch (reread_bus_info_block(device, device->generation)) { | |
1052 | case REREAD_BIB_ERROR: | |
1053 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
1054 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1055 | device->config_rom_retries++; | |
1056 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
1057 | ||
1058 | return; | |
1059 | } | |
1060 | goto give_up; | |
1061 | ||
1062 | case REREAD_BIB_GONE: | |
1063 | goto gone; | |
1064 | ||
1065 | case REREAD_BIB_UNCHANGED: | |
1066 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
1067 | FW_DEVICE_INITIALIZING, |
1068 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1069 | goto gone; |
1070 | ||
1071 | fw_device_update(work); | |
1072 | device->config_rom_retries = 0; | |
1073 | goto out; | |
1074 | ||
1075 | case REREAD_BIB_CHANGED: | |
1076 | break; | |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * Something changed. We keep things simple and don't investigate | |
1081 | * further. We just destroy all previous units and create new ones. | |
1082 | */ | |
1083 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
1084 | ||
1085 | if (read_bus_info_block(device, device->generation) < 0) { | |
1086 | if (device->config_rom_retries < MAX_RETRIES && | |
1087 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
1088 | device->config_rom_retries++; | |
1089 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
1090 | ||
1091 | return; | |
1092 | } | |
1093 | goto give_up; | |
1094 | } | |
1095 | ||
1096 | create_units(device); | |
1097 | ||
0210b66d SR |
1098 | /* Userspace may want to re-read attributes. */ |
1099 | kobject_uevent(&device->device.kobj, KOBJ_CHANGE); | |
1100 | ||
c9755e14 | 1101 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
1102 | FW_DEVICE_INITIALIZING, |
1103 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
1104 | goto gone; |
1105 | ||
a1f64819 | 1106 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
1107 | device->config_rom_retries = 0; |
1108 | goto out; | |
1109 | ||
1110 | give_up: | |
a1f64819 | 1111 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 1112 | gone: |
3d36a0df SR |
1113 | atomic_set(&device->state, FW_DEVICE_GONE); |
1114 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
1115 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
c9755e14 SR |
1116 | out: |
1117 | if (node_id == card->root_node->node_id) | |
0fa1986f | 1118 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
1119 | } |
1120 | ||
19a15b93 KH |
1121 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
1122 | { | |
1123 | struct fw_device *device; | |
1124 | ||
19a15b93 KH |
1125 | switch (event) { |
1126 | case FW_NODE_CREATED: | |
1127 | case FW_NODE_LINK_ON: | |
1128 | if (!node->link_on) | |
1129 | break; | |
c9755e14 | 1130 | create: |
19a15b93 KH |
1131 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
1132 | if (device == NULL) | |
1133 | break; | |
1134 | ||
c781c06d KH |
1135 | /* |
1136 | * Do minimal intialization of the device here, the | |
62305823 SR |
1137 | * rest will happen in fw_device_init(). |
1138 | * | |
1139 | * Attention: A lot of things, even fw_device_get(), | |
1140 | * cannot be done before fw_device_init() finished! | |
1141 | * You can basically just check device->state and | |
1142 | * schedule work until then, but only while holding | |
1143 | * card->lock. | |
c781c06d | 1144 | */ |
641f8791 | 1145 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1146 | device->card = fw_card_get(card); |
19a15b93 KH |
1147 | device->node = fw_node_get(node); |
1148 | device->node_id = node->node_id; | |
1149 | device->generation = card->generation; | |
92368890 | 1150 | device->is_local = node == card->local_node; |
d67cfb96 | 1151 | mutex_init(&device->client_list_mutex); |
97bd9efa | 1152 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1153 | |
c781c06d KH |
1154 | /* |
1155 | * Set the node data to point back to this device so | |
19a15b93 | 1156 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1157 | * and generation for the device. |
1158 | */ | |
19a15b93 KH |
1159 | node->data = device; |
1160 | ||
c781c06d KH |
1161 | /* |
1162 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1163 | * especially if they are bus powered and go through |
1164 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1165 | * first config rom scan half a second after bus reset. |
1166 | */ | |
19a15b93 KH |
1167 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1168 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
1169 | break; | |
1170 | ||
c9755e14 SR |
1171 | case FW_NODE_INITIATED_RESET: |
1172 | device = node->data; | |
1173 | if (device == NULL) | |
1174 | goto create; | |
1175 | ||
1176 | device->node_id = node->node_id; | |
1177 | smp_wmb(); /* update node_id before generation */ | |
1178 | device->generation = card->generation; | |
1179 | if (atomic_cmpxchg(&device->state, | |
1180 | FW_DEVICE_RUNNING, | |
1181 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1182 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
1183 | schedule_delayed_work(&device->work, | |
92368890 | 1184 | device->is_local ? 0 : INITIAL_DELAY); |
c9755e14 SR |
1185 | } |
1186 | break; | |
1187 | ||
19a15b93 KH |
1188 | case FW_NODE_UPDATED: |
1189 | if (!node->link_on || node->data == NULL) | |
1190 | break; | |
1191 | ||
1192 | device = node->data; | |
1193 | device->node_id = node->node_id; | |
b5d2a5e0 | 1194 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1195 | device->generation = card->generation; |
5f480477 KH |
1196 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1197 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
1198 | schedule_delayed_work(&device->work, 0); | |
1199 | } | |
19a15b93 KH |
1200 | break; |
1201 | ||
1202 | case FW_NODE_DESTROYED: | |
1203 | case FW_NODE_LINK_OFF: | |
1204 | if (!node->data) | |
1205 | break; | |
1206 | ||
c781c06d KH |
1207 | /* |
1208 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1209 | * are two cases here: either the device is fully |
1210 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1211 | * process of reading its config rom | |
1212 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1213 | * initialized we can reuse device->work to schedule a | |
1214 | * full fw_device_shutdown(). If not, there's work | |
1215 | * scheduled to read it's config rom, and we just put | |
1216 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1217 | * to create the device. |
1218 | */ | |
19a15b93 | 1219 | device = node->data; |
641f8791 | 1220 | if (atomic_xchg(&device->state, |
3d36a0df | 1221 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1222 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
e747a5c0 SR |
1223 | schedule_delayed_work(&device->work, |
1224 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); | |
19a15b93 KH |
1225 | } |
1226 | break; | |
1227 | } | |
1228 | } |