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Commit | Line | Data |
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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> |
633c52dc SR |
28 | #include <linux/rwsem.h> |
29 | #include <asm/semaphore.h> | |
b5d2a5e0 | 30 | #include <asm/system.h> |
7feb9cce | 31 | #include <linux/ctype.h> |
19a15b93 KH |
32 | #include "fw-transaction.h" |
33 | #include "fw-topology.h" | |
34 | #include "fw-device.h" | |
35 | ||
36 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
37 | { | |
38 | ci->p = p + 1; | |
39 | ci->end = ci->p + (p[0] >> 16); | |
40 | } | |
19a15b93 KH |
41 | EXPORT_SYMBOL(fw_csr_iterator_init); |
42 | ||
43 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
44 | { | |
45 | *key = *ci->p >> 24; | |
46 | *value = *ci->p & 0xffffff; | |
47 | ||
48 | return ci->p++ < ci->end; | |
49 | } | |
19a15b93 KH |
50 | EXPORT_SYMBOL(fw_csr_iterator_next); |
51 | ||
52 | static int is_fw_unit(struct device *dev); | |
53 | ||
21ebcd12 | 54 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
19a15b93 KH |
55 | { |
56 | struct fw_csr_iterator ci; | |
57 | int key, value, match; | |
58 | ||
59 | match = 0; | |
60 | fw_csr_iterator_init(&ci, directory); | |
61 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
62 | if (key == CSR_VENDOR && value == id->vendor) | |
63 | match |= FW_MATCH_VENDOR; | |
64 | if (key == CSR_MODEL && value == id->model) | |
65 | match |= FW_MATCH_MODEL; | |
66 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
67 | match |= FW_MATCH_SPECIFIER_ID; | |
68 | if (key == CSR_VERSION && value == id->version) | |
69 | match |= FW_MATCH_VERSION; | |
70 | } | |
71 | ||
72 | return (match & id->match_flags) == id->match_flags; | |
73 | } | |
74 | ||
75 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
76 | { | |
77 | struct fw_unit *unit = fw_unit(dev); | |
78 | struct fw_driver *driver = fw_driver(drv); | |
79 | int i; | |
80 | ||
81 | /* We only allow binding to fw_units. */ | |
82 | if (!is_fw_unit(dev)) | |
83 | return 0; | |
84 | ||
85 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
86 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
87 | return 1; | |
88 | } | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
94 | { | |
95 | struct fw_device *device = fw_device(unit->device.parent); | |
96 | struct fw_csr_iterator ci; | |
97 | ||
98 | int key, value; | |
99 | int vendor = 0; | |
100 | int model = 0; | |
101 | int specifier_id = 0; | |
102 | int version = 0; | |
103 | ||
104 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
105 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
106 | switch (key) { | |
107 | case CSR_VENDOR: | |
108 | vendor = value; | |
109 | break; | |
110 | case CSR_MODEL: | |
111 | model = value; | |
112 | break; | |
113 | } | |
114 | } | |
115 | ||
116 | fw_csr_iterator_init(&ci, unit->directory); | |
117 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
118 | switch (key) { | |
119 | case CSR_SPECIFIER_ID: | |
120 | specifier_id = value; | |
121 | break; | |
122 | case CSR_VERSION: | |
123 | version = value; | |
124 | break; | |
125 | } | |
126 | } | |
127 | ||
128 | return snprintf(buffer, buffer_size, | |
129 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
130 | vendor, model, specifier_id, version); | |
131 | } | |
132 | ||
133 | static int | |
7eff2e7a | 134 | fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
135 | { |
136 | struct fw_unit *unit = fw_unit(dev); | |
137 | char modalias[64]; | |
19a15b93 | 138 | |
2d826cc5 | 139 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 140 | |
7eff2e7a | 141 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
142 | return -ENOMEM; |
143 | ||
19a15b93 KH |
144 | return 0; |
145 | } | |
146 | ||
147 | struct bus_type fw_bus_type = { | |
362c2c8c | 148 | .name = "firewire", |
19a15b93 | 149 | .match = fw_unit_match, |
19a15b93 | 150 | }; |
19a15b93 KH |
151 | EXPORT_SYMBOL(fw_bus_type); |
152 | ||
19a15b93 KH |
153 | static void fw_device_release(struct device *dev) |
154 | { | |
155 | struct fw_device *device = fw_device(dev); | |
855c603d | 156 | struct fw_card *card = device->card; |
19a15b93 KH |
157 | unsigned long flags; |
158 | ||
c781c06d KH |
159 | /* |
160 | * Take the card lock so we don't set this to NULL while a | |
161 | * FW_NODE_UPDATED callback is being handled. | |
162 | */ | |
19a15b93 KH |
163 | spin_lock_irqsave(&device->card->lock, flags); |
164 | device->node->data = NULL; | |
165 | spin_unlock_irqrestore(&device->card->lock, flags); | |
166 | ||
167 | fw_node_put(device->node); | |
19a15b93 KH |
168 | kfree(device->config_rom); |
169 | kfree(device); | |
855c603d | 170 | atomic_dec(&card->device_count); |
19a15b93 KH |
171 | } |
172 | ||
173 | int fw_device_enable_phys_dma(struct fw_device *device) | |
174 | { | |
b5d2a5e0 SR |
175 | int generation = device->generation; |
176 | ||
177 | /* device->node_id, accessed below, must not be older than generation */ | |
178 | smp_rmb(); | |
179 | ||
19a15b93 KH |
180 | return device->card->driver->enable_phys_dma(device->card, |
181 | device->node_id, | |
b5d2a5e0 | 182 | generation); |
19a15b93 | 183 | } |
19a15b93 KH |
184 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
185 | ||
7feb9cce KH |
186 | struct config_rom_attribute { |
187 | struct device_attribute attr; | |
188 | u32 key; | |
189 | }; | |
190 | ||
191 | static ssize_t | |
192 | show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) | |
193 | { | |
194 | struct config_rom_attribute *attr = | |
195 | container_of(dattr, struct config_rom_attribute, attr); | |
196 | struct fw_csr_iterator ci; | |
197 | u32 *dir; | |
198 | int key, value; | |
199 | ||
200 | if (is_fw_unit(dev)) | |
201 | dir = fw_unit(dev)->directory; | |
202 | else | |
203 | dir = fw_device(dev)->config_rom + 5; | |
204 | ||
205 | fw_csr_iterator_init(&ci, dir); | |
206 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
207 | if (attr->key == key) | |
208 | return snprintf(buf, buf ? PAGE_SIZE : 0, | |
209 | "0x%06x\n", value); | |
210 | ||
211 | return -ENOENT; | |
212 | } | |
213 | ||
214 | #define IMMEDIATE_ATTR(name, key) \ | |
215 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
216 | ||
217 | static ssize_t | |
218 | show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) | |
219 | { | |
220 | struct config_rom_attribute *attr = | |
221 | container_of(dattr, struct config_rom_attribute, attr); | |
222 | struct fw_csr_iterator ci; | |
223 | u32 *dir, *block = NULL, *p, *end; | |
224 | int length, key, value, last_key = 0; | |
225 | char *b; | |
226 | ||
227 | if (is_fw_unit(dev)) | |
228 | dir = fw_unit(dev)->directory; | |
229 | else | |
230 | dir = fw_device(dev)->config_rom + 5; | |
231 | ||
232 | fw_csr_iterator_init(&ci, dir); | |
233 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
234 | if (attr->key == last_key && | |
235 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
236 | block = ci.p - 1 + value; | |
237 | last_key = key; | |
238 | } | |
239 | ||
240 | if (block == NULL) | |
241 | return -ENOENT; | |
242 | ||
243 | length = min(block[0] >> 16, 256U); | |
244 | if (length < 3) | |
245 | return -ENOENT; | |
246 | ||
247 | if (block[1] != 0 || block[2] != 0) | |
248 | /* Unknown encoding. */ | |
249 | return -ENOENT; | |
250 | ||
251 | if (buf == NULL) | |
252 | return length * 4; | |
253 | ||
254 | b = buf; | |
255 | end = &block[length + 1]; | |
256 | for (p = &block[3]; p < end; p++, b += 4) | |
257 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
258 | ||
259 | /* Strip trailing whitespace and add newline. */ | |
260 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
261 | strcpy(b + 1, "\n"); | |
262 | ||
263 | return b + 2 - buf; | |
264 | } | |
265 | ||
266 | #define TEXT_LEAF_ATTR(name, key) \ | |
267 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
268 | ||
269 | static struct config_rom_attribute config_rom_attributes[] = { | |
270 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
271 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
272 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
273 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
274 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
275 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
276 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
277 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
278 | }; | |
279 | ||
280 | static void | |
6f2e53d5 KH |
281 | init_fw_attribute_group(struct device *dev, |
282 | struct device_attribute *attrs, | |
283 | struct fw_attribute_group *group) | |
7feb9cce KH |
284 | { |
285 | struct device_attribute *attr; | |
6f2e53d5 KH |
286 | int i, j; |
287 | ||
288 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
289 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
290 | |
291 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
292 | attr = &config_rom_attributes[i].attr; | |
293 | if (attr->show(dev, attr, NULL) < 0) | |
294 | continue; | |
6f2e53d5 | 295 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
296 | } |
297 | ||
6f2e53d5 KH |
298 | BUG_ON(j >= ARRAY_SIZE(group->attrs)); |
299 | group->attrs[j++] = NULL; | |
300 | group->groups[0] = &group->group; | |
301 | group->groups[1] = NULL; | |
302 | group->group.attrs = group->attrs; | |
303 | dev->groups = group->groups; | |
7feb9cce KH |
304 | } |
305 | ||
19a15b93 | 306 | static ssize_t |
21351dbe KH |
307 | modalias_show(struct device *dev, |
308 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
309 | { |
310 | struct fw_unit *unit = fw_unit(dev); | |
311 | int length; | |
312 | ||
313 | length = get_modalias(unit, buf, PAGE_SIZE); | |
314 | strcpy(buf + length, "\n"); | |
315 | ||
316 | return length + 1; | |
317 | } | |
318 | ||
19a15b93 | 319 | static ssize_t |
21351dbe KH |
320 | rom_index_show(struct device *dev, |
321 | struct device_attribute *attr, char *buf) | |
19a15b93 | 322 | { |
21351dbe KH |
323 | struct fw_device *device = fw_device(dev->parent); |
324 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 325 | |
21351dbe KH |
326 | return snprintf(buf, PAGE_SIZE, "%d\n", |
327 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
328 | } |
329 | ||
21351dbe KH |
330 | static struct device_attribute fw_unit_attributes[] = { |
331 | __ATTR_RO(modalias), | |
332 | __ATTR_RO(rom_index), | |
333 | __ATTR_NULL, | |
19a15b93 KH |
334 | }; |
335 | ||
048961ef | 336 | static ssize_t |
bbd14945 | 337 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
048961ef | 338 | { |
21351dbe | 339 | struct fw_device *device = fw_device(dev); |
048961ef | 340 | |
21351dbe KH |
341 | memcpy(buf, device->config_rom, device->config_rom_length * 4); |
342 | ||
343 | return device->config_rom_length * 4; | |
048961ef KH |
344 | } |
345 | ||
bbd14945 KH |
346 | static ssize_t |
347 | guid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
348 | { | |
349 | struct fw_device *device = fw_device(dev); | |
bbd14945 | 350 | |
fa6e697b SR |
351 | return snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", |
352 | device->config_rom[3], device->config_rom[4]); | |
bbd14945 KH |
353 | } |
354 | ||
21351dbe KH |
355 | static struct device_attribute fw_device_attributes[] = { |
356 | __ATTR_RO(config_rom), | |
bbd14945 | 357 | __ATTR_RO(guid), |
21351dbe | 358 | __ATTR_NULL, |
048961ef KH |
359 | }; |
360 | ||
19a15b93 KH |
361 | struct read_quadlet_callback_data { |
362 | struct completion done; | |
363 | int rcode; | |
364 | u32 data; | |
365 | }; | |
366 | ||
367 | static void | |
368 | complete_transaction(struct fw_card *card, int rcode, | |
369 | void *payload, size_t length, void *data) | |
370 | { | |
371 | struct read_quadlet_callback_data *callback_data = data; | |
372 | ||
373 | if (rcode == RCODE_COMPLETE) | |
374 | callback_data->data = be32_to_cpu(*(__be32 *)payload); | |
375 | callback_data->rcode = rcode; | |
376 | complete(&callback_data->done); | |
377 | } | |
378 | ||
f8d2dc39 SR |
379 | static int |
380 | read_rom(struct fw_device *device, int generation, int index, u32 *data) | |
19a15b93 KH |
381 | { |
382 | struct read_quadlet_callback_data callback_data; | |
383 | struct fw_transaction t; | |
384 | u64 offset; | |
b5d2a5e0 SR |
385 | |
386 | /* device->node_id, accessed below, must not be older than generation */ | |
387 | smp_rmb(); | |
19a15b93 KH |
388 | |
389 | init_completion(&callback_data.done); | |
390 | ||
391 | offset = 0xfffff0000400ULL + index * 4; | |
392 | fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST, | |
b5d2a5e0 | 393 | device->node_id, generation, device->max_speed, |
19a15b93 KH |
394 | offset, NULL, 4, complete_transaction, &callback_data); |
395 | ||
396 | wait_for_completion(&callback_data.done); | |
397 | ||
398 | *data = callback_data.data; | |
399 | ||
400 | return callback_data.rcode; | |
401 | } | |
402 | ||
1dadff71 SR |
403 | #define READ_BIB_ROM_SIZE 256 |
404 | #define READ_BIB_STACK_SIZE 16 | |
405 | ||
f8d2dc39 SR |
406 | /* |
407 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
408 | * the config ROM. We do all this with a cached bus generation. If the bus | |
409 | * generation changes under us, read_bus_info_block will fail and get retried. | |
410 | * It's better to start all over in this case because the node from which we | |
411 | * are reading the ROM may have changed the ROM during the reset. | |
412 | */ | |
413 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 414 | { |
1dadff71 SR |
415 | u32 *rom, *stack; |
416 | u32 sp, key; | |
417 | int i, end, length, ret = -1; | |
418 | ||
419 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
420 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
421 | if (rom == NULL) | |
422 | return -ENOMEM; | |
423 | ||
424 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 425 | |
f1397490 SR |
426 | device->max_speed = SCODE_100; |
427 | ||
19a15b93 KH |
428 | /* First read the bus info block. */ |
429 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 430 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 431 | goto out; |
c781c06d KH |
432 | /* |
433 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
434 | * reply with a 0 for the first quadlet of the config |
435 | * rom to indicate that they are booting (for example, | |
436 | * if the firmware is on the disk of a external | |
437 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
438 | * retry mechanism will try again later. |
439 | */ | |
19a15b93 | 440 | if (i == 0 && rom[i] == 0) |
1dadff71 | 441 | goto out; |
19a15b93 KH |
442 | } |
443 | ||
f1397490 SR |
444 | device->max_speed = device->node->max_speed; |
445 | ||
446 | /* | |
447 | * Determine the speed of | |
448 | * - devices with link speed less than PHY speed, | |
449 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
450 | * - all devices if there are 1394b repeaters. | |
451 | * Note, we cannot use the bus info block's link_spd as starting point | |
452 | * because some buggy firmwares set it lower than necessary and because | |
453 | * 1394-1995 nodes do not have the field. | |
454 | */ | |
455 | if ((rom[2] & 0x7) < device->max_speed || | |
456 | device->max_speed == SCODE_BETA || | |
457 | device->card->beta_repeaters_present) { | |
458 | u32 dummy; | |
459 | ||
460 | /* for S1600 and S3200 */ | |
461 | if (device->max_speed == SCODE_BETA) | |
462 | device->max_speed = device->card->link_speed; | |
463 | ||
464 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
465 | if (read_rom(device, generation, 0, &dummy) == |
466 | RCODE_COMPLETE) | |
f1397490 SR |
467 | break; |
468 | device->max_speed--; | |
469 | } | |
470 | } | |
471 | ||
c781c06d KH |
472 | /* |
473 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
474 | * directory structure so we parse it using a stack of |
475 | * references to the blocks that make up the structure. We | |
476 | * push a reference to the root directory on the stack to | |
c781c06d KH |
477 | * start things off. |
478 | */ | |
19a15b93 KH |
479 | length = i; |
480 | sp = 0; | |
481 | stack[sp++] = 0xc0000005; | |
482 | while (sp > 0) { | |
c781c06d KH |
483 | /* |
484 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
485 | * lower 24 bits is the offset into the config rom, |
486 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
487 | * block. |
488 | */ | |
19a15b93 KH |
489 | key = stack[--sp]; |
490 | i = key & 0xffffff; | |
1dadff71 | 491 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
492 | /* |
493 | * The reference points outside the standard | |
494 | * config rom area, something's fishy. | |
495 | */ | |
1dadff71 | 496 | goto out; |
19a15b93 KH |
497 | |
498 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 499 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 500 | goto out; |
19a15b93 KH |
501 | end = i + (rom[i] >> 16) + 1; |
502 | i++; | |
1dadff71 | 503 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
504 | /* |
505 | * This block extends outside standard config | |
19a15b93 KH |
506 | * area (and the array we're reading it |
507 | * into). That's broken, so ignore this | |
c781c06d KH |
508 | * device. |
509 | */ | |
1dadff71 | 510 | goto out; |
19a15b93 | 511 | |
c781c06d KH |
512 | /* |
513 | * Now read in the block. If this is a directory | |
19a15b93 | 514 | * block, check the entries as we read them to see if |
c781c06d KH |
515 | * it references another block, and push it in that case. |
516 | */ | |
19a15b93 | 517 | while (i < end) { |
f8d2dc39 SR |
518 | if (read_rom(device, generation, i, &rom[i]) != |
519 | RCODE_COMPLETE) | |
1dadff71 | 520 | goto out; |
19a15b93 | 521 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 522 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
523 | stack[sp++] = i + rom[i]; |
524 | i++; | |
525 | } | |
526 | if (length < i) | |
527 | length = i; | |
528 | } | |
529 | ||
530 | device->config_rom = kmalloc(length * 4, GFP_KERNEL); | |
531 | if (device->config_rom == NULL) | |
1dadff71 | 532 | goto out; |
19a15b93 KH |
533 | memcpy(device->config_rom, rom, length * 4); |
534 | device->config_rom_length = length; | |
1dadff71 SR |
535 | ret = 0; |
536 | out: | |
537 | kfree(rom); | |
19a15b93 | 538 | |
1dadff71 | 539 | return ret; |
19a15b93 KH |
540 | } |
541 | ||
542 | static void fw_unit_release(struct device *dev) | |
543 | { | |
544 | struct fw_unit *unit = fw_unit(dev); | |
545 | ||
546 | kfree(unit); | |
547 | } | |
548 | ||
21351dbe | 549 | static struct device_type fw_unit_type = { |
21351dbe KH |
550 | .uevent = fw_unit_uevent, |
551 | .release = fw_unit_release, | |
552 | }; | |
553 | ||
19a15b93 KH |
554 | static int is_fw_unit(struct device *dev) |
555 | { | |
21351dbe | 556 | return dev->type == &fw_unit_type; |
19a15b93 KH |
557 | } |
558 | ||
559 | static void create_units(struct fw_device *device) | |
560 | { | |
561 | struct fw_csr_iterator ci; | |
562 | struct fw_unit *unit; | |
563 | int key, value, i; | |
564 | ||
565 | i = 0; | |
566 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
567 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
568 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
569 | continue; | |
570 | ||
c781c06d KH |
571 | /* |
572 | * Get the address of the unit directory and try to | |
573 | * match the drivers id_tables against it. | |
574 | */ | |
2d826cc5 | 575 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
576 | if (unit == NULL) { |
577 | fw_error("failed to allocate memory for unit\n"); | |
578 | continue; | |
579 | } | |
580 | ||
581 | unit->directory = ci.p + value - 1; | |
582 | unit->device.bus = &fw_bus_type; | |
21351dbe | 583 | unit->device.type = &fw_unit_type; |
19a15b93 | 584 | unit->device.parent = &device->device; |
2d826cc5 | 585 | snprintf(unit->device.bus_id, sizeof(unit->device.bus_id), |
19a15b93 KH |
586 | "%s.%d", device->device.bus_id, i++); |
587 | ||
6f2e53d5 KH |
588 | init_fw_attribute_group(&unit->device, |
589 | fw_unit_attributes, | |
590 | &unit->attribute_group); | |
7feb9cce KH |
591 | if (device_register(&unit->device) < 0) |
592 | goto skip_unit; | |
593 | ||
7feb9cce KH |
594 | continue; |
595 | ||
7feb9cce KH |
596 | skip_unit: |
597 | kfree(unit); | |
19a15b93 KH |
598 | } |
599 | } | |
600 | ||
601 | static int shutdown_unit(struct device *device, void *data) | |
602 | { | |
21351dbe | 603 | device_unregister(device); |
19a15b93 KH |
604 | |
605 | return 0; | |
606 | } | |
607 | ||
dde2b954 | 608 | static DECLARE_RWSEM(idr_rwsem); |
a3aca3da KH |
609 | static DEFINE_IDR(fw_device_idr); |
610 | int fw_cdev_major; | |
611 | ||
96b19062 | 612 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
613 | { |
614 | struct fw_device *device; | |
615 | ||
dde2b954 | 616 | down_read(&idr_rwsem); |
a3aca3da | 617 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
618 | if (device) |
619 | fw_device_get(device); | |
dde2b954 | 620 | up_read(&idr_rwsem); |
a3aca3da KH |
621 | |
622 | return device; | |
623 | } | |
624 | ||
19a15b93 KH |
625 | static void fw_device_shutdown(struct work_struct *work) |
626 | { | |
627 | struct fw_device *device = | |
628 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
629 | int minor = MINOR(device->device.devt); |
630 | ||
2603bf21 | 631 | fw_device_cdev_remove(device); |
19a15b93 KH |
632 | device_for_each_child(&device->device, NULL, shutdown_unit); |
633 | device_unregister(&device->device); | |
96b19062 SR |
634 | |
635 | down_write(&idr_rwsem); | |
636 | idr_remove(&fw_device_idr, minor); | |
637 | up_write(&idr_rwsem); | |
638 | fw_device_put(device); | |
19a15b93 KH |
639 | } |
640 | ||
21351dbe | 641 | static struct device_type fw_device_type = { |
21351dbe KH |
642 | .release = fw_device_release, |
643 | }; | |
644 | ||
c781c06d KH |
645 | /* |
646 | * These defines control the retry behavior for reading the config | |
19a15b93 KH |
647 | * rom. It shouldn't be necessary to tweak these; if the device |
648 | * doesn't respond to a config rom read within 10 seconds, it's not | |
649 | * going to respond at all. As for the initial delay, a lot of | |
650 | * devices will be able to respond within half a second after bus | |
651 | * reset. On the other hand, it's not really worth being more | |
652 | * aggressive than that, since it scales pretty well; if 10 devices | |
c781c06d KH |
653 | * are plugged in, they're all getting read within one second. |
654 | */ | |
19a15b93 | 655 | |
c5dfd0a5 KH |
656 | #define MAX_RETRIES 10 |
657 | #define RETRY_DELAY (3 * HZ) | |
19a15b93 KH |
658 | #define INITIAL_DELAY (HZ / 2) |
659 | ||
660 | static void fw_device_init(struct work_struct *work) | |
661 | { | |
19a15b93 KH |
662 | struct fw_device *device = |
663 | container_of(work, struct fw_device, work.work); | |
a3aca3da | 664 | int minor, err; |
19a15b93 | 665 | |
c781c06d KH |
666 | /* |
667 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 668 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
669 | * device. |
670 | */ | |
19a15b93 | 671 | |
f8d2dc39 | 672 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
673 | if (device->config_rom_retries < MAX_RETRIES && |
674 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
675 | device->config_rom_retries++; |
676 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
677 | } else { | |
907293d7 | 678 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 679 | device->node_id); |
931c4834 KH |
680 | if (device->node == device->card->root_node) |
681 | schedule_delayed_work(&device->card->work, 0); | |
19a15b93 KH |
682 | fw_device_release(&device->device); |
683 | } | |
684 | return; | |
685 | } | |
686 | ||
a3aca3da | 687 | err = -ENOMEM; |
96b19062 SR |
688 | |
689 | fw_device_get(device); | |
dde2b954 | 690 | down_write(&idr_rwsem); |
a3aca3da KH |
691 | if (idr_pre_get(&fw_device_idr, GFP_KERNEL)) |
692 | err = idr_get_new(&fw_device_idr, device, &minor); | |
dde2b954 | 693 | up_write(&idr_rwsem); |
96b19062 | 694 | |
a3aca3da KH |
695 | if (err < 0) |
696 | goto error; | |
697 | ||
19a15b93 | 698 | device->device.bus = &fw_bus_type; |
21351dbe | 699 | device->device.type = &fw_device_type; |
19a15b93 | 700 | device->device.parent = device->card->device; |
a3aca3da | 701 | device->device.devt = MKDEV(fw_cdev_major, minor); |
2d826cc5 | 702 | snprintf(device->device.bus_id, sizeof(device->device.bus_id), |
a3aca3da | 703 | "fw%d", minor); |
19a15b93 | 704 | |
6f2e53d5 KH |
705 | init_fw_attribute_group(&device->device, |
706 | fw_device_attributes, | |
707 | &device->attribute_group); | |
19a15b93 KH |
708 | if (device_add(&device->device)) { |
709 | fw_error("Failed to add device.\n"); | |
a3aca3da | 710 | goto error_with_cdev; |
19a15b93 KH |
711 | } |
712 | ||
19a15b93 KH |
713 | create_units(device); |
714 | ||
c781c06d KH |
715 | /* |
716 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
717 | * out from under us while we did the intialization work, we |
718 | * have to shut down the device again here. Normally, though, | |
719 | * fw_node_event will be responsible for shutting it down when | |
720 | * necessary. We have to use the atomic cmpxchg here to avoid | |
721 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
722 | * fw_node_event(). |
723 | */ | |
641f8791 | 724 | if (atomic_cmpxchg(&device->state, |
19a15b93 | 725 | FW_DEVICE_INITIALIZING, |
fa6e697b | 726 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) { |
19a15b93 | 727 | fw_device_shutdown(&device->work.work); |
fa6e697b SR |
728 | } else { |
729 | if (device->config_rom_retries) | |
730 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
731 | "%d config ROM retries\n", | |
732 | device->device.bus_id, | |
733 | device->config_rom[3], device->config_rom[4], | |
734 | 1 << device->max_speed, | |
735 | device->config_rom_retries); | |
736 | else | |
737 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
738 | device->device.bus_id, | |
739 | device->config_rom[3], device->config_rom[4], | |
740 | 1 << device->max_speed); | |
741 | } | |
19a15b93 | 742 | |
c781c06d KH |
743 | /* |
744 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
745 | * root node config rom. If this races with a bus reset we |
746 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
747 | * pretty harmless. |
748 | */ | |
19a15b93 KH |
749 | if (device->node == device->card->root_node) |
750 | schedule_delayed_work(&device->card->work, 0); | |
751 | ||
752 | return; | |
753 | ||
a3aca3da | 754 | error_with_cdev: |
dde2b954 | 755 | down_write(&idr_rwsem); |
a3aca3da | 756 | idr_remove(&fw_device_idr, minor); |
dde2b954 | 757 | up_write(&idr_rwsem); |
373b2edd | 758 | error: |
96b19062 SR |
759 | fw_device_put(device); /* fw_device_idr's reference */ |
760 | ||
761 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
762 | } |
763 | ||
764 | static int update_unit(struct device *dev, void *data) | |
765 | { | |
766 | struct fw_unit *unit = fw_unit(dev); | |
767 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
768 | ||
015b066f KH |
769 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
770 | down(&dev->sem); | |
19a15b93 | 771 | driver->update(unit); |
015b066f KH |
772 | up(&dev->sem); |
773 | } | |
19a15b93 KH |
774 | |
775 | return 0; | |
776 | } | |
777 | ||
5f480477 KH |
778 | static void fw_device_update(struct work_struct *work) |
779 | { | |
780 | struct fw_device *device = | |
781 | container_of(work, struct fw_device, work.work); | |
782 | ||
97bd9efa | 783 | fw_device_cdev_update(device); |
5f480477 KH |
784 | device_for_each_child(&device->device, NULL, update_unit); |
785 | } | |
786 | ||
19a15b93 KH |
787 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
788 | { | |
789 | struct fw_device *device; | |
790 | ||
19a15b93 KH |
791 | switch (event) { |
792 | case FW_NODE_CREATED: | |
793 | case FW_NODE_LINK_ON: | |
794 | if (!node->link_on) | |
795 | break; | |
796 | ||
797 | device = kzalloc(sizeof(*device), GFP_ATOMIC); | |
798 | if (device == NULL) | |
799 | break; | |
800 | ||
c781c06d KH |
801 | /* |
802 | * Do minimal intialization of the device here, the | |
19a15b93 KH |
803 | * rest will happen in fw_device_init(). We need the |
804 | * card and node so we can read the config rom and we | |
805 | * need to do device_initialize() now so | |
806 | * device_for_each_child() in FW_NODE_UPDATED is | |
c781c06d KH |
807 | * doesn't freak out. |
808 | */ | |
19a15b93 | 809 | device_initialize(&device->device); |
641f8791 | 810 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
855c603d SR |
811 | atomic_inc(&card->device_count); |
812 | device->card = card; | |
19a15b93 KH |
813 | device->node = fw_node_get(node); |
814 | device->node_id = node->node_id; | |
815 | device->generation = card->generation; | |
97bd9efa | 816 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 817 | |
c781c06d KH |
818 | /* |
819 | * Set the node data to point back to this device so | |
19a15b93 | 820 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
821 | * and generation for the device. |
822 | */ | |
19a15b93 KH |
823 | node->data = device; |
824 | ||
c781c06d KH |
825 | /* |
826 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
827 | * especially if they are bus powered and go through |
828 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
829 | * first config rom scan half a second after bus reset. |
830 | */ | |
19a15b93 KH |
831 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
832 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
833 | break; | |
834 | ||
835 | case FW_NODE_UPDATED: | |
836 | if (!node->link_on || node->data == NULL) | |
837 | break; | |
838 | ||
839 | device = node->data; | |
840 | device->node_id = node->node_id; | |
b5d2a5e0 | 841 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 842 | device->generation = card->generation; |
5f480477 KH |
843 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
844 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
845 | schedule_delayed_work(&device->work, 0); | |
846 | } | |
19a15b93 KH |
847 | break; |
848 | ||
849 | case FW_NODE_DESTROYED: | |
850 | case FW_NODE_LINK_OFF: | |
851 | if (!node->data) | |
852 | break; | |
853 | ||
c781c06d KH |
854 | /* |
855 | * Destroy the device associated with the node. There | |
19a15b93 KH |
856 | * are two cases here: either the device is fully |
857 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
858 | * process of reading its config rom | |
859 | * (FW_DEVICE_INITIALIZING). If it is fully | |
860 | * initialized we can reuse device->work to schedule a | |
861 | * full fw_device_shutdown(). If not, there's work | |
862 | * scheduled to read it's config rom, and we just put | |
863 | * the device in shutdown state to have that code fail | |
c781c06d KH |
864 | * to create the device. |
865 | */ | |
19a15b93 | 866 | device = node->data; |
641f8791 | 867 | if (atomic_xchg(&device->state, |
5f480477 KH |
868 | FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { |
869 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
19a15b93 KH |
870 | schedule_delayed_work(&device->work, 0); |
871 | } | |
872 | break; | |
873 | } | |
874 | } |