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 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/wait.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/kthread.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/delay.h> | |
a3aca3da | 27 | #include <linux/idr.h> |
c9755e14 | 28 | #include <linux/string.h> |
6188e10d MW |
29 | #include <linux/rwsem.h> |
30 | #include <linux/semaphore.h> | |
b5d2a5e0 | 31 | #include <asm/system.h> |
7feb9cce | 32 | #include <linux/ctype.h> |
19a15b93 KH |
33 | #include "fw-transaction.h" |
34 | #include "fw-topology.h" | |
35 | #include "fw-device.h" | |
36 | ||
37 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
38 | { | |
39 | ci->p = p + 1; | |
40 | ci->end = ci->p + (p[0] >> 16); | |
41 | } | |
19a15b93 KH |
42 | EXPORT_SYMBOL(fw_csr_iterator_init); |
43 | ||
44 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
45 | { | |
46 | *key = *ci->p >> 24; | |
47 | *value = *ci->p & 0xffffff; | |
48 | ||
49 | return ci->p++ < ci->end; | |
50 | } | |
19a15b93 KH |
51 | EXPORT_SYMBOL(fw_csr_iterator_next); |
52 | ||
53 | static int is_fw_unit(struct device *dev); | |
54 | ||
21ebcd12 | 55 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
19a15b93 KH |
56 | { |
57 | struct fw_csr_iterator ci; | |
58 | int key, value, match; | |
59 | ||
60 | match = 0; | |
61 | fw_csr_iterator_init(&ci, directory); | |
62 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
63 | if (key == CSR_VENDOR && value == id->vendor) | |
64 | match |= FW_MATCH_VENDOR; | |
65 | if (key == CSR_MODEL && value == id->model) | |
66 | match |= FW_MATCH_MODEL; | |
67 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
68 | match |= FW_MATCH_SPECIFIER_ID; | |
69 | if (key == CSR_VERSION && value == id->version) | |
70 | match |= FW_MATCH_VERSION; | |
71 | } | |
72 | ||
73 | return (match & id->match_flags) == id->match_flags; | |
74 | } | |
75 | ||
76 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
77 | { | |
78 | struct fw_unit *unit = fw_unit(dev); | |
79 | struct fw_driver *driver = fw_driver(drv); | |
80 | int i; | |
81 | ||
82 | /* We only allow binding to fw_units. */ | |
83 | if (!is_fw_unit(dev)) | |
84 | return 0; | |
85 | ||
86 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
87 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
88 | return 1; | |
89 | } | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
95 | { | |
96 | struct fw_device *device = fw_device(unit->device.parent); | |
97 | struct fw_csr_iterator ci; | |
98 | ||
99 | int key, value; | |
100 | int vendor = 0; | |
101 | int model = 0; | |
102 | int specifier_id = 0; | |
103 | int version = 0; | |
104 | ||
105 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
106 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
107 | switch (key) { | |
108 | case CSR_VENDOR: | |
109 | vendor = value; | |
110 | break; | |
111 | case CSR_MODEL: | |
112 | model = value; | |
113 | break; | |
114 | } | |
115 | } | |
116 | ||
117 | fw_csr_iterator_init(&ci, unit->directory); | |
118 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
119 | switch (key) { | |
120 | case CSR_SPECIFIER_ID: | |
121 | specifier_id = value; | |
122 | break; | |
123 | case CSR_VERSION: | |
124 | version = value; | |
125 | break; | |
126 | } | |
127 | } | |
128 | ||
129 | return snprintf(buffer, buffer_size, | |
130 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
131 | vendor, model, specifier_id, version); | |
132 | } | |
133 | ||
134 | static int | |
7eff2e7a | 135 | fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
136 | { |
137 | struct fw_unit *unit = fw_unit(dev); | |
138 | char modalias[64]; | |
19a15b93 | 139 | |
2d826cc5 | 140 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 141 | |
7eff2e7a | 142 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
143 | return -ENOMEM; |
144 | ||
19a15b93 KH |
145 | return 0; |
146 | } | |
147 | ||
148 | struct bus_type fw_bus_type = { | |
362c2c8c | 149 | .name = "firewire", |
19a15b93 | 150 | .match = fw_unit_match, |
19a15b93 | 151 | }; |
19a15b93 KH |
152 | EXPORT_SYMBOL(fw_bus_type); |
153 | ||
19a15b93 KH |
154 | static void fw_device_release(struct device *dev) |
155 | { | |
156 | struct fw_device *device = fw_device(dev); | |
855c603d | 157 | struct fw_card *card = device->card; |
19a15b93 KH |
158 | unsigned long flags; |
159 | ||
c781c06d KH |
160 | /* |
161 | * Take the card lock so we don't set this to NULL while a | |
62305823 SR |
162 | * FW_NODE_UPDATED callback is being handled or while the |
163 | * bus manager work looks at this node. | |
c781c06d | 164 | */ |
c9755e14 | 165 | spin_lock_irqsave(&card->lock, flags); |
19a15b93 | 166 | device->node->data = NULL; |
c9755e14 | 167 | spin_unlock_irqrestore(&card->lock, flags); |
19a15b93 KH |
168 | |
169 | fw_node_put(device->node); | |
19a15b93 KH |
170 | kfree(device->config_rom); |
171 | kfree(device); | |
459f7923 | 172 | fw_card_put(card); |
19a15b93 KH |
173 | } |
174 | ||
175 | int fw_device_enable_phys_dma(struct fw_device *device) | |
176 | { | |
b5d2a5e0 SR |
177 | int generation = device->generation; |
178 | ||
179 | /* device->node_id, accessed below, must not be older than generation */ | |
180 | smp_rmb(); | |
181 | ||
19a15b93 KH |
182 | return device->card->driver->enable_phys_dma(device->card, |
183 | device->node_id, | |
b5d2a5e0 | 184 | generation); |
19a15b93 | 185 | } |
19a15b93 KH |
186 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
187 | ||
7feb9cce KH |
188 | struct config_rom_attribute { |
189 | struct device_attribute attr; | |
190 | u32 key; | |
191 | }; | |
192 | ||
193 | static ssize_t | |
194 | show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) | |
195 | { | |
196 | struct config_rom_attribute *attr = | |
197 | container_of(dattr, struct config_rom_attribute, attr); | |
198 | struct fw_csr_iterator ci; | |
199 | u32 *dir; | |
c9755e14 SR |
200 | int key, value, ret = -ENOENT; |
201 | ||
202 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
203 | |
204 | if (is_fw_unit(dev)) | |
205 | dir = fw_unit(dev)->directory; | |
206 | else | |
207 | dir = fw_device(dev)->config_rom + 5; | |
208 | ||
209 | fw_csr_iterator_init(&ci, dir); | |
210 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
211 | if (attr->key == key) { |
212 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
213 | "0x%06x\n", value); | |
214 | break; | |
215 | } | |
216 | ||
217 | up_read(&fw_device_rwsem); | |
7feb9cce | 218 | |
c9755e14 | 219 | return ret; |
7feb9cce KH |
220 | } |
221 | ||
222 | #define IMMEDIATE_ATTR(name, key) \ | |
223 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
224 | ||
225 | static ssize_t | |
226 | show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) | |
227 | { | |
228 | struct config_rom_attribute *attr = | |
229 | container_of(dattr, struct config_rom_attribute, attr); | |
230 | struct fw_csr_iterator ci; | |
231 | u32 *dir, *block = NULL, *p, *end; | |
c9755e14 | 232 | int length, key, value, last_key = 0, ret = -ENOENT; |
7feb9cce KH |
233 | char *b; |
234 | ||
c9755e14 SR |
235 | down_read(&fw_device_rwsem); |
236 | ||
7feb9cce KH |
237 | if (is_fw_unit(dev)) |
238 | dir = fw_unit(dev)->directory; | |
239 | else | |
240 | dir = fw_device(dev)->config_rom + 5; | |
241 | ||
242 | fw_csr_iterator_init(&ci, dir); | |
243 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
244 | if (attr->key == last_key && | |
245 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
246 | block = ci.p - 1 + value; | |
247 | last_key = key; | |
248 | } | |
249 | ||
250 | if (block == NULL) | |
c9755e14 | 251 | goto out; |
7feb9cce KH |
252 | |
253 | length = min(block[0] >> 16, 256U); | |
254 | if (length < 3) | |
c9755e14 | 255 | goto out; |
7feb9cce KH |
256 | |
257 | if (block[1] != 0 || block[2] != 0) | |
258 | /* Unknown encoding. */ | |
c9755e14 | 259 | goto out; |
7feb9cce | 260 | |
c9755e14 SR |
261 | if (buf == NULL) { |
262 | ret = length * 4; | |
263 | goto out; | |
264 | } | |
7feb9cce KH |
265 | |
266 | b = buf; | |
267 | end = &block[length + 1]; | |
268 | for (p = &block[3]; p < end; p++, b += 4) | |
269 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
270 | ||
271 | /* Strip trailing whitespace and add newline. */ | |
272 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
273 | strcpy(b + 1, "\n"); | |
c9755e14 SR |
274 | ret = b + 2 - buf; |
275 | out: | |
276 | up_read(&fw_device_rwsem); | |
7feb9cce | 277 | |
c9755e14 | 278 | return ret; |
7feb9cce KH |
279 | } |
280 | ||
281 | #define TEXT_LEAF_ATTR(name, key) \ | |
282 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
283 | ||
284 | static struct config_rom_attribute config_rom_attributes[] = { | |
285 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
286 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
287 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
288 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
289 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
290 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
291 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
292 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
293 | }; | |
294 | ||
295 | static void | |
6f2e53d5 KH |
296 | init_fw_attribute_group(struct device *dev, |
297 | struct device_attribute *attrs, | |
298 | struct fw_attribute_group *group) | |
7feb9cce KH |
299 | { |
300 | struct device_attribute *attr; | |
6f2e53d5 KH |
301 | int i, j; |
302 | ||
303 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
304 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
305 | |
306 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
307 | attr = &config_rom_attributes[i].attr; | |
308 | if (attr->show(dev, attr, NULL) < 0) | |
309 | continue; | |
6f2e53d5 | 310 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
311 | } |
312 | ||
6f2e53d5 KH |
313 | BUG_ON(j >= ARRAY_SIZE(group->attrs)); |
314 | group->attrs[j++] = NULL; | |
315 | group->groups[0] = &group->group; | |
316 | group->groups[1] = NULL; | |
317 | group->group.attrs = group->attrs; | |
318 | dev->groups = group->groups; | |
7feb9cce KH |
319 | } |
320 | ||
19a15b93 | 321 | static ssize_t |
21351dbe KH |
322 | modalias_show(struct device *dev, |
323 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
324 | { |
325 | struct fw_unit *unit = fw_unit(dev); | |
326 | int length; | |
327 | ||
328 | length = get_modalias(unit, buf, PAGE_SIZE); | |
329 | strcpy(buf + length, "\n"); | |
330 | ||
331 | return length + 1; | |
332 | } | |
333 | ||
19a15b93 | 334 | static ssize_t |
21351dbe KH |
335 | rom_index_show(struct device *dev, |
336 | struct device_attribute *attr, char *buf) | |
19a15b93 | 337 | { |
21351dbe KH |
338 | struct fw_device *device = fw_device(dev->parent); |
339 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 340 | |
21351dbe KH |
341 | return snprintf(buf, PAGE_SIZE, "%d\n", |
342 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
343 | } |
344 | ||
21351dbe KH |
345 | static struct device_attribute fw_unit_attributes[] = { |
346 | __ATTR_RO(modalias), | |
347 | __ATTR_RO(rom_index), | |
348 | __ATTR_NULL, | |
19a15b93 KH |
349 | }; |
350 | ||
048961ef | 351 | static ssize_t |
bbd14945 | 352 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
048961ef | 353 | { |
21351dbe | 354 | struct fw_device *device = fw_device(dev); |
c9755e14 | 355 | size_t length; |
048961ef | 356 | |
c9755e14 SR |
357 | down_read(&fw_device_rwsem); |
358 | length = device->config_rom_length * 4; | |
359 | memcpy(buf, device->config_rom, length); | |
360 | up_read(&fw_device_rwsem); | |
21351dbe | 361 | |
c9755e14 | 362 | return length; |
048961ef KH |
363 | } |
364 | ||
bbd14945 KH |
365 | static ssize_t |
366 | guid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
367 | { | |
368 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
369 | int ret; |
370 | ||
371 | down_read(&fw_device_rwsem); | |
372 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
373 | device->config_rom[3], device->config_rom[4]); | |
374 | up_read(&fw_device_rwsem); | |
bbd14945 | 375 | |
c9755e14 | 376 | return ret; |
bbd14945 KH |
377 | } |
378 | ||
21351dbe KH |
379 | static struct device_attribute fw_device_attributes[] = { |
380 | __ATTR_RO(config_rom), | |
bbd14945 | 381 | __ATTR_RO(guid), |
21351dbe | 382 | __ATTR_NULL, |
048961ef KH |
383 | }; |
384 | ||
f8d2dc39 SR |
385 | static int |
386 | read_rom(struct fw_device *device, int generation, int index, u32 *data) | |
19a15b93 | 387 | { |
1e119fa9 | 388 | int rcode; |
b5d2a5e0 SR |
389 | |
390 | /* device->node_id, accessed below, must not be older than generation */ | |
391 | smp_rmb(); | |
19a15b93 | 392 | |
1e119fa9 | 393 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 394 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
395 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
396 | data, 4); | |
397 | be32_to_cpus(data); | |
19a15b93 | 398 | |
1e119fa9 | 399 | return rcode; |
19a15b93 KH |
400 | } |
401 | ||
1dadff71 SR |
402 | #define READ_BIB_ROM_SIZE 256 |
403 | #define READ_BIB_STACK_SIZE 16 | |
404 | ||
f8d2dc39 SR |
405 | /* |
406 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
407 | * the config ROM. We do all this with a cached bus generation. If the bus | |
408 | * generation changes under us, read_bus_info_block will fail and get retried. | |
409 | * It's better to start all over in this case because the node from which we | |
410 | * are reading the ROM may have changed the ROM during the reset. | |
411 | */ | |
412 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 413 | { |
c9755e14 | 414 | u32 *rom, *stack, *old_rom, *new_rom; |
1dadff71 SR |
415 | u32 sp, key; |
416 | int i, end, length, ret = -1; | |
417 | ||
418 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
419 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
420 | if (rom == NULL) | |
421 | return -ENOMEM; | |
422 | ||
423 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 424 | |
f1397490 SR |
425 | device->max_speed = SCODE_100; |
426 | ||
19a15b93 KH |
427 | /* First read the bus info block. */ |
428 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 429 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 430 | goto out; |
c781c06d KH |
431 | /* |
432 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
433 | * reply with a 0 for the first quadlet of the config |
434 | * rom to indicate that they are booting (for example, | |
435 | * if the firmware is on the disk of a external | |
436 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
437 | * retry mechanism will try again later. |
438 | */ | |
19a15b93 | 439 | if (i == 0 && rom[i] == 0) |
1dadff71 | 440 | goto out; |
19a15b93 KH |
441 | } |
442 | ||
f1397490 SR |
443 | device->max_speed = device->node->max_speed; |
444 | ||
445 | /* | |
446 | * Determine the speed of | |
447 | * - devices with link speed less than PHY speed, | |
448 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
449 | * - all devices if there are 1394b repeaters. | |
450 | * Note, we cannot use the bus info block's link_spd as starting point | |
451 | * because some buggy firmwares set it lower than necessary and because | |
452 | * 1394-1995 nodes do not have the field. | |
453 | */ | |
454 | if ((rom[2] & 0x7) < device->max_speed || | |
455 | device->max_speed == SCODE_BETA || | |
456 | device->card->beta_repeaters_present) { | |
457 | u32 dummy; | |
458 | ||
459 | /* for S1600 and S3200 */ | |
460 | if (device->max_speed == SCODE_BETA) | |
461 | device->max_speed = device->card->link_speed; | |
462 | ||
463 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
464 | if (read_rom(device, generation, 0, &dummy) == |
465 | RCODE_COMPLETE) | |
f1397490 SR |
466 | break; |
467 | device->max_speed--; | |
468 | } | |
469 | } | |
470 | ||
c781c06d KH |
471 | /* |
472 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
473 | * directory structure so we parse it using a stack of |
474 | * references to the blocks that make up the structure. We | |
475 | * push a reference to the root directory on the stack to | |
c781c06d KH |
476 | * start things off. |
477 | */ | |
19a15b93 KH |
478 | length = i; |
479 | sp = 0; | |
480 | stack[sp++] = 0xc0000005; | |
481 | while (sp > 0) { | |
c781c06d KH |
482 | /* |
483 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
484 | * lower 24 bits is the offset into the config rom, |
485 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
486 | * block. |
487 | */ | |
19a15b93 KH |
488 | key = stack[--sp]; |
489 | i = key & 0xffffff; | |
1dadff71 | 490 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
491 | /* |
492 | * The reference points outside the standard | |
493 | * config rom area, something's fishy. | |
494 | */ | |
1dadff71 | 495 | goto out; |
19a15b93 KH |
496 | |
497 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 498 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 499 | goto out; |
19a15b93 KH |
500 | end = i + (rom[i] >> 16) + 1; |
501 | i++; | |
1dadff71 | 502 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
503 | /* |
504 | * This block extends outside standard config | |
19a15b93 KH |
505 | * area (and the array we're reading it |
506 | * into). That's broken, so ignore this | |
c781c06d KH |
507 | * device. |
508 | */ | |
1dadff71 | 509 | goto out; |
19a15b93 | 510 | |
c781c06d KH |
511 | /* |
512 | * Now read in the block. If this is a directory | |
19a15b93 | 513 | * block, check the entries as we read them to see if |
c781c06d KH |
514 | * it references another block, and push it in that case. |
515 | */ | |
19a15b93 | 516 | while (i < end) { |
f8d2dc39 SR |
517 | if (read_rom(device, generation, i, &rom[i]) != |
518 | RCODE_COMPLETE) | |
1dadff71 | 519 | goto out; |
19a15b93 | 520 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 521 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
522 | stack[sp++] = i + rom[i]; |
523 | i++; | |
524 | } | |
525 | if (length < i) | |
526 | length = i; | |
527 | } | |
528 | ||
c9755e14 SR |
529 | old_rom = device->config_rom; |
530 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
531 | if (new_rom == NULL) | |
1dadff71 | 532 | goto out; |
c9755e14 SR |
533 | |
534 | down_write(&fw_device_rwsem); | |
535 | device->config_rom = new_rom; | |
19a15b93 | 536 | device->config_rom_length = length; |
c9755e14 SR |
537 | up_write(&fw_device_rwsem); |
538 | ||
539 | kfree(old_rom); | |
1dadff71 | 540 | ret = 0; |
c9755e14 | 541 | device->cmc = rom[2] & 1 << 30; |
1dadff71 SR |
542 | out: |
543 | kfree(rom); | |
19a15b93 | 544 | |
1dadff71 | 545 | return ret; |
19a15b93 KH |
546 | } |
547 | ||
548 | static void fw_unit_release(struct device *dev) | |
549 | { | |
550 | struct fw_unit *unit = fw_unit(dev); | |
551 | ||
552 | kfree(unit); | |
553 | } | |
554 | ||
21351dbe | 555 | static struct device_type fw_unit_type = { |
21351dbe KH |
556 | .uevent = fw_unit_uevent, |
557 | .release = fw_unit_release, | |
558 | }; | |
559 | ||
19a15b93 KH |
560 | static int is_fw_unit(struct device *dev) |
561 | { | |
21351dbe | 562 | return dev->type == &fw_unit_type; |
19a15b93 KH |
563 | } |
564 | ||
565 | static void create_units(struct fw_device *device) | |
566 | { | |
567 | struct fw_csr_iterator ci; | |
568 | struct fw_unit *unit; | |
569 | int key, value, i; | |
570 | ||
571 | i = 0; | |
572 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
573 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
574 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
575 | continue; | |
576 | ||
c781c06d KH |
577 | /* |
578 | * Get the address of the unit directory and try to | |
579 | * match the drivers id_tables against it. | |
580 | */ | |
2d826cc5 | 581 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
582 | if (unit == NULL) { |
583 | fw_error("failed to allocate memory for unit\n"); | |
584 | continue; | |
585 | } | |
586 | ||
587 | unit->directory = ci.p + value - 1; | |
588 | unit->device.bus = &fw_bus_type; | |
21351dbe | 589 | unit->device.type = &fw_unit_type; |
19a15b93 | 590 | unit->device.parent = &device->device; |
a1f64819 | 591 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 592 | |
6f2e53d5 KH |
593 | init_fw_attribute_group(&unit->device, |
594 | fw_unit_attributes, | |
595 | &unit->attribute_group); | |
7feb9cce KH |
596 | if (device_register(&unit->device) < 0) |
597 | goto skip_unit; | |
598 | ||
7feb9cce KH |
599 | continue; |
600 | ||
7feb9cce KH |
601 | skip_unit: |
602 | kfree(unit); | |
19a15b93 KH |
603 | } |
604 | } | |
605 | ||
606 | static int shutdown_unit(struct device *device, void *data) | |
607 | { | |
21351dbe | 608 | device_unregister(device); |
19a15b93 KH |
609 | |
610 | return 0; | |
611 | } | |
612 | ||
c9755e14 SR |
613 | /* |
614 | * fw_device_rwsem acts as dual purpose mutex: | |
615 | * - serializes accesses to fw_device_idr, | |
616 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
617 | * fw_unit.directory, unless those accesses happen at safe occasions | |
618 | */ | |
619 | DECLARE_RWSEM(fw_device_rwsem); | |
620 | ||
d6053e08 | 621 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
622 | int fw_cdev_major; |
623 | ||
96b19062 | 624 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
625 | { |
626 | struct fw_device *device; | |
627 | ||
c9755e14 | 628 | down_read(&fw_device_rwsem); |
a3aca3da | 629 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
630 | if (device) |
631 | fw_device_get(device); | |
c9755e14 | 632 | up_read(&fw_device_rwsem); |
a3aca3da KH |
633 | |
634 | return device; | |
635 | } | |
636 | ||
19a15b93 KH |
637 | static void fw_device_shutdown(struct work_struct *work) |
638 | { | |
639 | struct fw_device *device = | |
640 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
641 | int minor = MINOR(device->device.devt); |
642 | ||
2603bf21 | 643 | fw_device_cdev_remove(device); |
19a15b93 KH |
644 | device_for_each_child(&device->device, NULL, shutdown_unit); |
645 | device_unregister(&device->device); | |
96b19062 | 646 | |
c9755e14 | 647 | down_write(&fw_device_rwsem); |
96b19062 | 648 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 649 | up_write(&fw_device_rwsem); |
96b19062 | 650 | fw_device_put(device); |
19a15b93 KH |
651 | } |
652 | ||
21351dbe | 653 | static struct device_type fw_device_type = { |
21351dbe KH |
654 | .release = fw_device_release, |
655 | }; | |
656 | ||
c781c06d KH |
657 | /* |
658 | * These defines control the retry behavior for reading the config | |
19a15b93 KH |
659 | * rom. It shouldn't be necessary to tweak these; if the device |
660 | * doesn't respond to a config rom read within 10 seconds, it's not | |
661 | * going to respond at all. As for the initial delay, a lot of | |
662 | * devices will be able to respond within half a second after bus | |
663 | * reset. On the other hand, it's not really worth being more | |
664 | * aggressive than that, since it scales pretty well; if 10 devices | |
c781c06d KH |
665 | * are plugged in, they're all getting read within one second. |
666 | */ | |
19a15b93 | 667 | |
c5dfd0a5 KH |
668 | #define MAX_RETRIES 10 |
669 | #define RETRY_DELAY (3 * HZ) | |
19a15b93 KH |
670 | #define INITIAL_DELAY (HZ / 2) |
671 | ||
672 | static void fw_device_init(struct work_struct *work) | |
673 | { | |
19a15b93 KH |
674 | struct fw_device *device = |
675 | container_of(work, struct fw_device, work.work); | |
a3aca3da | 676 | int minor, err; |
19a15b93 | 677 | |
c781c06d KH |
678 | /* |
679 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 680 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
681 | * device. |
682 | */ | |
19a15b93 | 683 | |
f8d2dc39 | 684 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
685 | if (device->config_rom_retries < MAX_RETRIES && |
686 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
687 | device->config_rom_retries++; |
688 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
689 | } else { | |
907293d7 | 690 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 691 | device->node_id); |
931c4834 | 692 | if (device->node == device->card->root_node) |
0fa1986f | 693 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
694 | fw_device_release(&device->device); |
695 | } | |
696 | return; | |
697 | } | |
698 | ||
62305823 | 699 | device_initialize(&device->device); |
96b19062 SR |
700 | |
701 | fw_device_get(device); | |
c9755e14 | 702 | down_write(&fw_device_rwsem); |
62305823 SR |
703 | err = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
704 | idr_get_new(&fw_device_idr, device, &minor) : | |
705 | -ENOMEM; | |
c9755e14 | 706 | up_write(&fw_device_rwsem); |
96b19062 | 707 | |
a3aca3da KH |
708 | if (err < 0) |
709 | goto error; | |
710 | ||
19a15b93 | 711 | device->device.bus = &fw_bus_type; |
21351dbe | 712 | device->device.type = &fw_device_type; |
19a15b93 | 713 | device->device.parent = device->card->device; |
a3aca3da | 714 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 715 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 716 | |
6f2e53d5 KH |
717 | init_fw_attribute_group(&device->device, |
718 | fw_device_attributes, | |
719 | &device->attribute_group); | |
19a15b93 KH |
720 | if (device_add(&device->device)) { |
721 | fw_error("Failed to add device.\n"); | |
a3aca3da | 722 | goto error_with_cdev; |
19a15b93 KH |
723 | } |
724 | ||
19a15b93 KH |
725 | create_units(device); |
726 | ||
c781c06d KH |
727 | /* |
728 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
729 | * out from under us while we did the intialization work, we |
730 | * have to shut down the device again here. Normally, though, | |
731 | * fw_node_event will be responsible for shutting it down when | |
732 | * necessary. We have to use the atomic cmpxchg here to avoid | |
733 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
734 | * fw_node_event(). |
735 | */ | |
641f8791 | 736 | if (atomic_cmpxchg(&device->state, |
19a15b93 | 737 | FW_DEVICE_INITIALIZING, |
fa6e697b | 738 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) { |
c9755e14 | 739 | fw_device_shutdown(work); |
fa6e697b SR |
740 | } else { |
741 | if (device->config_rom_retries) | |
742 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
743 | "%d config ROM retries\n", | |
a1f64819 | 744 | dev_name(&device->device), |
fa6e697b SR |
745 | device->config_rom[3], device->config_rom[4], |
746 | 1 << device->max_speed, | |
747 | device->config_rom_retries); | |
748 | else | |
749 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 750 | dev_name(&device->device), |
fa6e697b SR |
751 | device->config_rom[3], device->config_rom[4], |
752 | 1 << device->max_speed); | |
c9755e14 | 753 | device->config_rom_retries = 0; |
fa6e697b | 754 | } |
19a15b93 | 755 | |
c781c06d KH |
756 | /* |
757 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
758 | * root node config rom. If this races with a bus reset we |
759 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
760 | * pretty harmless. |
761 | */ | |
19a15b93 | 762 | if (device->node == device->card->root_node) |
0fa1986f | 763 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
764 | |
765 | return; | |
766 | ||
a3aca3da | 767 | error_with_cdev: |
c9755e14 | 768 | down_write(&fw_device_rwsem); |
a3aca3da | 769 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 770 | up_write(&fw_device_rwsem); |
373b2edd | 771 | error: |
96b19062 SR |
772 | fw_device_put(device); /* fw_device_idr's reference */ |
773 | ||
774 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
775 | } |
776 | ||
777 | static int update_unit(struct device *dev, void *data) | |
778 | { | |
779 | struct fw_unit *unit = fw_unit(dev); | |
780 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
781 | ||
015b066f KH |
782 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
783 | down(&dev->sem); | |
19a15b93 | 784 | driver->update(unit); |
015b066f KH |
785 | up(&dev->sem); |
786 | } | |
19a15b93 KH |
787 | |
788 | return 0; | |
789 | } | |
790 | ||
5f480477 KH |
791 | static void fw_device_update(struct work_struct *work) |
792 | { | |
793 | struct fw_device *device = | |
794 | container_of(work, struct fw_device, work.work); | |
795 | ||
97bd9efa | 796 | fw_device_cdev_update(device); |
5f480477 KH |
797 | device_for_each_child(&device->device, NULL, update_unit); |
798 | } | |
799 | ||
c9755e14 SR |
800 | enum { |
801 | REREAD_BIB_ERROR, | |
802 | REREAD_BIB_GONE, | |
803 | REREAD_BIB_UNCHANGED, | |
804 | REREAD_BIB_CHANGED, | |
805 | }; | |
806 | ||
807 | /* Reread and compare bus info block and header of root directory */ | |
808 | static int reread_bus_info_block(struct fw_device *device, int generation) | |
809 | { | |
810 | u32 q; | |
811 | int i; | |
812 | ||
813 | for (i = 0; i < 6; i++) { | |
814 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
815 | return REREAD_BIB_ERROR; | |
816 | ||
817 | if (i == 0 && q == 0) | |
818 | return REREAD_BIB_GONE; | |
819 | ||
820 | if (i > device->config_rom_length || q != device->config_rom[i]) | |
821 | return REREAD_BIB_CHANGED; | |
822 | } | |
823 | ||
824 | return REREAD_BIB_UNCHANGED; | |
825 | } | |
826 | ||
827 | static void fw_device_refresh(struct work_struct *work) | |
828 | { | |
829 | struct fw_device *device = | |
830 | container_of(work, struct fw_device, work.work); | |
831 | struct fw_card *card = device->card; | |
832 | int node_id = device->node_id; | |
833 | ||
834 | switch (reread_bus_info_block(device, device->generation)) { | |
835 | case REREAD_BIB_ERROR: | |
836 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
837 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
838 | device->config_rom_retries++; | |
839 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
840 | ||
841 | return; | |
842 | } | |
843 | goto give_up; | |
844 | ||
845 | case REREAD_BIB_GONE: | |
846 | goto gone; | |
847 | ||
848 | case REREAD_BIB_UNCHANGED: | |
849 | if (atomic_cmpxchg(&device->state, | |
850 | FW_DEVICE_INITIALIZING, | |
851 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) | |
852 | goto gone; | |
853 | ||
854 | fw_device_update(work); | |
855 | device->config_rom_retries = 0; | |
856 | goto out; | |
857 | ||
858 | case REREAD_BIB_CHANGED: | |
859 | break; | |
860 | } | |
861 | ||
862 | /* | |
863 | * Something changed. We keep things simple and don't investigate | |
864 | * further. We just destroy all previous units and create new ones. | |
865 | */ | |
866 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
867 | ||
868 | if (read_bus_info_block(device, device->generation) < 0) { | |
869 | if (device->config_rom_retries < MAX_RETRIES && | |
870 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
871 | device->config_rom_retries++; | |
872 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
873 | ||
874 | return; | |
875 | } | |
876 | goto give_up; | |
877 | } | |
878 | ||
879 | create_units(device); | |
880 | ||
881 | if (atomic_cmpxchg(&device->state, | |
882 | FW_DEVICE_INITIALIZING, | |
883 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) | |
884 | goto gone; | |
885 | ||
a1f64819 | 886 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
887 | device->config_rom_retries = 0; |
888 | goto out; | |
889 | ||
890 | give_up: | |
a1f64819 | 891 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 SR |
892 | gone: |
893 | atomic_set(&device->state, FW_DEVICE_SHUTDOWN); | |
894 | fw_device_shutdown(work); | |
895 | out: | |
896 | if (node_id == card->root_node->node_id) | |
0fa1986f | 897 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
898 | } |
899 | ||
19a15b93 KH |
900 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
901 | { | |
902 | struct fw_device *device; | |
903 | ||
19a15b93 KH |
904 | switch (event) { |
905 | case FW_NODE_CREATED: | |
906 | case FW_NODE_LINK_ON: | |
907 | if (!node->link_on) | |
908 | break; | |
c9755e14 | 909 | create: |
19a15b93 KH |
910 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
911 | if (device == NULL) | |
912 | break; | |
913 | ||
c781c06d KH |
914 | /* |
915 | * Do minimal intialization of the device here, the | |
62305823 SR |
916 | * rest will happen in fw_device_init(). |
917 | * | |
918 | * Attention: A lot of things, even fw_device_get(), | |
919 | * cannot be done before fw_device_init() finished! | |
920 | * You can basically just check device->state and | |
921 | * schedule work until then, but only while holding | |
922 | * card->lock. | |
c781c06d | 923 | */ |
641f8791 | 924 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 925 | device->card = fw_card_get(card); |
19a15b93 KH |
926 | device->node = fw_node_get(node); |
927 | device->node_id = node->node_id; | |
928 | device->generation = card->generation; | |
97bd9efa | 929 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 930 | |
c781c06d KH |
931 | /* |
932 | * Set the node data to point back to this device so | |
19a15b93 | 933 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
934 | * and generation for the device. |
935 | */ | |
19a15b93 KH |
936 | node->data = device; |
937 | ||
c781c06d KH |
938 | /* |
939 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
940 | * especially if they are bus powered and go through |
941 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
942 | * first config rom scan half a second after bus reset. |
943 | */ | |
19a15b93 KH |
944 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
945 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
946 | break; | |
947 | ||
c9755e14 SR |
948 | case FW_NODE_INITIATED_RESET: |
949 | device = node->data; | |
950 | if (device == NULL) | |
951 | goto create; | |
952 | ||
953 | device->node_id = node->node_id; | |
954 | smp_wmb(); /* update node_id before generation */ | |
955 | device->generation = card->generation; | |
956 | if (atomic_cmpxchg(&device->state, | |
957 | FW_DEVICE_RUNNING, | |
958 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
959 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
960 | schedule_delayed_work(&device->work, | |
961 | node == card->local_node ? 0 : INITIAL_DELAY); | |
962 | } | |
963 | break; | |
964 | ||
19a15b93 KH |
965 | case FW_NODE_UPDATED: |
966 | if (!node->link_on || node->data == NULL) | |
967 | break; | |
968 | ||
969 | device = node->data; | |
970 | device->node_id = node->node_id; | |
b5d2a5e0 | 971 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 972 | device->generation = card->generation; |
5f480477 KH |
973 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
974 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
975 | schedule_delayed_work(&device->work, 0); | |
976 | } | |
19a15b93 KH |
977 | break; |
978 | ||
979 | case FW_NODE_DESTROYED: | |
980 | case FW_NODE_LINK_OFF: | |
981 | if (!node->data) | |
982 | break; | |
983 | ||
c781c06d KH |
984 | /* |
985 | * Destroy the device associated with the node. There | |
19a15b93 KH |
986 | * are two cases here: either the device is fully |
987 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
988 | * process of reading its config rom | |
989 | * (FW_DEVICE_INITIALIZING). If it is fully | |
990 | * initialized we can reuse device->work to schedule a | |
991 | * full fw_device_shutdown(). If not, there's work | |
992 | * scheduled to read it's config rom, and we just put | |
993 | * the device in shutdown state to have that code fail | |
c781c06d KH |
994 | * to create the device. |
995 | */ | |
19a15b93 | 996 | device = node->data; |
641f8791 | 997 | if (atomic_xchg(&device->state, |
5f480477 KH |
998 | FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { |
999 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
19a15b93 KH |
1000 | schedule_delayed_work(&device->work, 0); |
1001 | } | |
1002 | break; | |
1003 | } | |
1004 | } |