Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 1 | /* -*- c-basic-offset: 8 -*- |
| 2 | * |
| 3 | * fw-device.c - Device probing and sysfs code. |
| 4 | * |
| 5 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software Foundation, |
| 19 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/wait.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/kthread.h> |
| 26 | #include <linux/device.h> |
| 27 | #include <linux/delay.h> |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 28 | #include <linux/idr.h> |
Stefan Richter | 633c52d | 2007-03-19 11:37:16 -0400 | [diff] [blame] | 29 | #include <linux/rwsem.h> |
| 30 | #include <asm/semaphore.h> |
Kristian Høgsberg | 7feb9cc | 2007-03-21 10:55:19 -0400 | [diff] [blame] | 31 | #include <linux/ctype.h> |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 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 | } |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 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 | } |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 50 | EXPORT_SYMBOL(fw_csr_iterator_next); |
| 51 | |
| 52 | static int is_fw_unit(struct device *dev); |
| 53 | |
Stefan Richter | 21ebcd1 | 2007-01-14 15:29:07 +0100 | [diff] [blame] | 54 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 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 |
| 134 | fw_unit_uevent(struct device *dev, char **envp, int num_envp, |
| 135 | char *buffer, int buffer_size) |
| 136 | { |
| 137 | struct fw_unit *unit = fw_unit(dev); |
| 138 | char modalias[64]; |
| 139 | int length = 0; |
| 140 | int i = 0; |
| 141 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 142 | get_modalias(unit, modalias, sizeof modalias); |
| 143 | |
| 144 | if (add_uevent_var(envp, num_envp, &i, |
| 145 | buffer, buffer_size, &length, |
| 146 | "MODALIAS=%s", modalias)) |
| 147 | return -ENOMEM; |
| 148 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 149 | envp[i] = NULL; |
| 150 | |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | struct bus_type fw_bus_type = { |
Kristian Høgsberg | 362c2c8 | 2007-02-06 14:49:37 -0500 | [diff] [blame] | 155 | .name = "firewire", |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 156 | .match = fw_unit_match, |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 157 | }; |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 158 | EXPORT_SYMBOL(fw_bus_type); |
| 159 | |
Randy Dunlap | 0b6aa3d | 2007-04-25 22:43:16 -0700 | [diff] [blame^] | 160 | struct fw_device *fw_device_get(struct fw_device *device) |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 161 | { |
| 162 | get_device(&device->device); |
| 163 | |
| 164 | return device; |
| 165 | } |
| 166 | |
Randy Dunlap | 0b6aa3d | 2007-04-25 22:43:16 -0700 | [diff] [blame^] | 167 | void fw_device_put(struct fw_device *device) |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 168 | { |
| 169 | put_device(&device->device); |
| 170 | } |
| 171 | |
| 172 | static void fw_device_release(struct device *dev) |
| 173 | { |
| 174 | struct fw_device *device = fw_device(dev); |
| 175 | unsigned long flags; |
| 176 | |
| 177 | /* Take the card lock so we don't set this to NULL while a |
| 178 | * FW_NODE_UPDATED callback is being handled. */ |
| 179 | spin_lock_irqsave(&device->card->lock, flags); |
| 180 | device->node->data = NULL; |
| 181 | spin_unlock_irqrestore(&device->card->lock, flags); |
| 182 | |
| 183 | fw_node_put(device->node); |
| 184 | fw_card_put(device->card); |
| 185 | kfree(device->config_rom); |
| 186 | kfree(device); |
| 187 | } |
| 188 | |
| 189 | int fw_device_enable_phys_dma(struct fw_device *device) |
| 190 | { |
| 191 | return device->card->driver->enable_phys_dma(device->card, |
| 192 | device->node_id, |
| 193 | device->generation); |
| 194 | } |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 195 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
| 196 | |
Kristian Høgsberg | 7feb9cc | 2007-03-21 10:55:19 -0400 | [diff] [blame] | 197 | struct config_rom_attribute { |
| 198 | struct device_attribute attr; |
| 199 | u32 key; |
| 200 | }; |
| 201 | |
| 202 | static ssize_t |
| 203 | show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) |
| 204 | { |
| 205 | struct config_rom_attribute *attr = |
| 206 | container_of(dattr, struct config_rom_attribute, attr); |
| 207 | struct fw_csr_iterator ci; |
| 208 | u32 *dir; |
| 209 | int key, value; |
| 210 | |
| 211 | if (is_fw_unit(dev)) |
| 212 | dir = fw_unit(dev)->directory; |
| 213 | else |
| 214 | dir = fw_device(dev)->config_rom + 5; |
| 215 | |
| 216 | fw_csr_iterator_init(&ci, dir); |
| 217 | while (fw_csr_iterator_next(&ci, &key, &value)) |
| 218 | if (attr->key == key) |
| 219 | return snprintf(buf, buf ? PAGE_SIZE : 0, |
| 220 | "0x%06x\n", value); |
| 221 | |
| 222 | return -ENOENT; |
| 223 | } |
| 224 | |
| 225 | #define IMMEDIATE_ATTR(name, key) \ |
| 226 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } |
| 227 | |
| 228 | static ssize_t |
| 229 | show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) |
| 230 | { |
| 231 | struct config_rom_attribute *attr = |
| 232 | container_of(dattr, struct config_rom_attribute, attr); |
| 233 | struct fw_csr_iterator ci; |
| 234 | u32 *dir, *block = NULL, *p, *end; |
| 235 | int length, key, value, last_key = 0; |
| 236 | char *b; |
| 237 | |
| 238 | if (is_fw_unit(dev)) |
| 239 | dir = fw_unit(dev)->directory; |
| 240 | else |
| 241 | dir = fw_device(dev)->config_rom + 5; |
| 242 | |
| 243 | fw_csr_iterator_init(&ci, dir); |
| 244 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
| 245 | if (attr->key == last_key && |
| 246 | key == (CSR_DESCRIPTOR | CSR_LEAF)) |
| 247 | block = ci.p - 1 + value; |
| 248 | last_key = key; |
| 249 | } |
| 250 | |
| 251 | if (block == NULL) |
| 252 | return -ENOENT; |
| 253 | |
| 254 | length = min(block[0] >> 16, 256U); |
| 255 | if (length < 3) |
| 256 | return -ENOENT; |
| 257 | |
| 258 | if (block[1] != 0 || block[2] != 0) |
| 259 | /* Unknown encoding. */ |
| 260 | return -ENOENT; |
| 261 | |
| 262 | if (buf == NULL) |
| 263 | return length * 4; |
| 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"); |
| 273 | |
| 274 | return b + 2 - buf; |
| 275 | } |
| 276 | |
| 277 | #define TEXT_LEAF_ATTR(name, key) \ |
| 278 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } |
| 279 | |
| 280 | static struct config_rom_attribute config_rom_attributes[] = { |
| 281 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), |
| 282 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), |
| 283 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), |
| 284 | IMMEDIATE_ATTR(version, CSR_VERSION), |
| 285 | IMMEDIATE_ATTR(model, CSR_MODEL), |
| 286 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), |
| 287 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), |
| 288 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), |
| 289 | }; |
| 290 | |
| 291 | static void |
Kristian Høgsberg | 6f2e53d | 2007-03-27 19:35:13 -0400 | [diff] [blame] | 292 | init_fw_attribute_group(struct device *dev, |
| 293 | struct device_attribute *attrs, |
| 294 | struct fw_attribute_group *group) |
Kristian Høgsberg | 7feb9cc | 2007-03-21 10:55:19 -0400 | [diff] [blame] | 295 | { |
| 296 | struct device_attribute *attr; |
Kristian Høgsberg | 6f2e53d | 2007-03-27 19:35:13 -0400 | [diff] [blame] | 297 | int i, j; |
| 298 | |
| 299 | for (j = 0; attrs[j].attr.name != NULL; j++) |
| 300 | group->attrs[j] = &attrs[j].attr; |
Kristian Høgsberg | 7feb9cc | 2007-03-21 10:55:19 -0400 | [diff] [blame] | 301 | |
| 302 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { |
| 303 | attr = &config_rom_attributes[i].attr; |
| 304 | if (attr->show(dev, attr, NULL) < 0) |
| 305 | continue; |
Kristian Høgsberg | 6f2e53d | 2007-03-27 19:35:13 -0400 | [diff] [blame] | 306 | group->attrs[j++] = &attr->attr; |
Kristian Høgsberg | 7feb9cc | 2007-03-21 10:55:19 -0400 | [diff] [blame] | 307 | } |
| 308 | |
Kristian Høgsberg | 6f2e53d | 2007-03-27 19:35:13 -0400 | [diff] [blame] | 309 | BUG_ON(j >= ARRAY_SIZE(group->attrs)); |
| 310 | group->attrs[j++] = NULL; |
| 311 | group->groups[0] = &group->group; |
| 312 | group->groups[1] = NULL; |
| 313 | group->group.attrs = group->attrs; |
| 314 | dev->groups = group->groups; |
Kristian Høgsberg | 7feb9cc | 2007-03-21 10:55:19 -0400 | [diff] [blame] | 315 | } |
| 316 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 317 | static ssize_t |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 318 | modalias_show(struct device *dev, |
| 319 | struct device_attribute *attr, char *buf) |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 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 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 330 | static ssize_t |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 331 | rom_index_show(struct device *dev, |
| 332 | struct device_attribute *attr, char *buf) |
Kristian Høgsberg | 048961e | 2007-03-07 12:12:46 -0500 | [diff] [blame] | 333 | { |
| 334 | struct fw_device *device = fw_device(dev->parent); |
| 335 | struct fw_unit *unit = fw_unit(dev); |
| 336 | |
| 337 | return snprintf(buf, PAGE_SIZE, "%d\n", |
Stefan Richter | d84702a | 2007-03-20 19:42:15 +0100 | [diff] [blame] | 338 | (int)(unit->directory - device->config_rom)); |
Kristian Høgsberg | 048961e | 2007-03-07 12:12:46 -0500 | [diff] [blame] | 339 | } |
| 340 | |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 341 | static struct device_attribute fw_unit_attributes[] = { |
| 342 | __ATTR_RO(modalias), |
| 343 | __ATTR_RO(rom_index), |
| 344 | __ATTR_NULL, |
| 345 | }; |
| 346 | |
| 347 | static ssize_t |
Kristian Høgsberg | bbd1494 | 2007-03-20 20:58:35 -0400 | [diff] [blame] | 348 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 349 | { |
| 350 | struct fw_device *device = fw_device(dev); |
| 351 | |
| 352 | memcpy(buf, device->config_rom, device->config_rom_length * 4); |
| 353 | |
| 354 | return device->config_rom_length * 4; |
| 355 | } |
| 356 | |
Kristian Høgsberg | bbd1494 | 2007-03-20 20:58:35 -0400 | [diff] [blame] | 357 | static ssize_t |
| 358 | guid_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 359 | { |
| 360 | struct fw_device *device = fw_device(dev); |
| 361 | u64 guid; |
| 362 | |
| 363 | guid = ((u64)device->config_rom[3] << 32) | device->config_rom[4]; |
| 364 | |
Andrew Morton | 3e1dcb0 | 2007-04-26 00:16:04 -0700 | [diff] [blame] | 365 | return snprintf(buf, PAGE_SIZE, "0x%016llx\n", |
| 366 | (unsigned long long)guid); |
Kristian Høgsberg | bbd1494 | 2007-03-20 20:58:35 -0400 | [diff] [blame] | 367 | } |
| 368 | |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 369 | static struct device_attribute fw_device_attributes[] = { |
| 370 | __ATTR_RO(config_rom), |
Kristian Høgsberg | bbd1494 | 2007-03-20 20:58:35 -0400 | [diff] [blame] | 371 | __ATTR_RO(guid), |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 372 | __ATTR_NULL, |
Kristian Høgsberg | 048961e | 2007-03-07 12:12:46 -0500 | [diff] [blame] | 373 | }; |
| 374 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 375 | struct read_quadlet_callback_data { |
| 376 | struct completion done; |
| 377 | int rcode; |
| 378 | u32 data; |
| 379 | }; |
| 380 | |
| 381 | static void |
| 382 | complete_transaction(struct fw_card *card, int rcode, |
| 383 | void *payload, size_t length, void *data) |
| 384 | { |
| 385 | struct read_quadlet_callback_data *callback_data = data; |
| 386 | |
| 387 | if (rcode == RCODE_COMPLETE) |
| 388 | callback_data->data = be32_to_cpu(*(__be32 *)payload); |
| 389 | callback_data->rcode = rcode; |
| 390 | complete(&callback_data->done); |
| 391 | } |
| 392 | |
| 393 | static int read_rom(struct fw_device *device, int index, u32 * data) |
| 394 | { |
| 395 | struct read_quadlet_callback_data callback_data; |
| 396 | struct fw_transaction t; |
| 397 | u64 offset; |
| 398 | |
| 399 | init_completion(&callback_data.done); |
| 400 | |
| 401 | offset = 0xfffff0000400ULL + index * 4; |
| 402 | fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST, |
Stefan Richter | 907293d | 2007-01-23 21:11:43 +0100 | [diff] [blame] | 403 | device->node_id, |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 404 | device->generation, SCODE_100, |
| 405 | offset, NULL, 4, complete_transaction, &callback_data); |
| 406 | |
| 407 | wait_for_completion(&callback_data.done); |
| 408 | |
| 409 | *data = callback_data.data; |
| 410 | |
| 411 | return callback_data.rcode; |
| 412 | } |
| 413 | |
| 414 | static int read_bus_info_block(struct fw_device *device) |
| 415 | { |
| 416 | static u32 rom[256]; |
| 417 | u32 stack[16], sp, key; |
| 418 | int i, end, length; |
| 419 | |
| 420 | /* First read the bus info block. */ |
| 421 | for (i = 0; i < 5; i++) { |
| 422 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) |
| 423 | return -1; |
| 424 | /* As per IEEE1212 7.2, during power-up, devices can |
| 425 | * reply with a 0 for the first quadlet of the config |
| 426 | * rom to indicate that they are booting (for example, |
| 427 | * if the firmware is on the disk of a external |
| 428 | * harddisk). In that case we just fail, and the |
| 429 | * retry mechanism will try again later. */ |
| 430 | if (i == 0 && rom[i] == 0) |
| 431 | return -1; |
| 432 | } |
| 433 | |
| 434 | /* Now parse the config rom. The config rom is a recursive |
| 435 | * directory structure so we parse it using a stack of |
| 436 | * references to the blocks that make up the structure. We |
| 437 | * push a reference to the root directory on the stack to |
| 438 | * start things off. */ |
| 439 | length = i; |
| 440 | sp = 0; |
| 441 | stack[sp++] = 0xc0000005; |
| 442 | while (sp > 0) { |
| 443 | /* Pop the next block reference of the stack. The |
| 444 | * lower 24 bits is the offset into the config rom, |
| 445 | * the upper 8 bits are the type of the reference the |
| 446 | * block. */ |
| 447 | key = stack[--sp]; |
| 448 | i = key & 0xffffff; |
| 449 | if (i >= ARRAY_SIZE(rom)) |
| 450 | /* The reference points outside the standard |
| 451 | * config rom area, something's fishy. */ |
| 452 | return -1; |
| 453 | |
| 454 | /* Read header quadlet for the block to get the length. */ |
| 455 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) |
| 456 | return -1; |
| 457 | end = i + (rom[i] >> 16) + 1; |
| 458 | i++; |
| 459 | if (end > ARRAY_SIZE(rom)) |
| 460 | /* This block extends outside standard config |
| 461 | * area (and the array we're reading it |
| 462 | * into). That's broken, so ignore this |
| 463 | * device. */ |
| 464 | return -1; |
| 465 | |
| 466 | /* Now read in the block. If this is a directory |
| 467 | * block, check the entries as we read them to see if |
| 468 | * it references another block, and push it in that case. */ |
| 469 | while (i < end) { |
| 470 | if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) |
| 471 | return -1; |
| 472 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
| 473 | sp < ARRAY_SIZE(stack)) |
| 474 | stack[sp++] = i + rom[i]; |
| 475 | i++; |
| 476 | } |
| 477 | if (length < i) |
| 478 | length = i; |
| 479 | } |
| 480 | |
| 481 | device->config_rom = kmalloc(length * 4, GFP_KERNEL); |
| 482 | if (device->config_rom == NULL) |
| 483 | return -1; |
| 484 | memcpy(device->config_rom, rom, length * 4); |
| 485 | device->config_rom_length = length; |
| 486 | |
| 487 | return 0; |
| 488 | } |
| 489 | |
| 490 | static void fw_unit_release(struct device *dev) |
| 491 | { |
| 492 | struct fw_unit *unit = fw_unit(dev); |
| 493 | |
| 494 | kfree(unit); |
| 495 | } |
| 496 | |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 497 | static struct device_type fw_unit_type = { |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 498 | .uevent = fw_unit_uevent, |
| 499 | .release = fw_unit_release, |
| 500 | }; |
| 501 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 502 | static int is_fw_unit(struct device *dev) |
| 503 | { |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 504 | return dev->type == &fw_unit_type; |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 505 | } |
| 506 | |
| 507 | static void create_units(struct fw_device *device) |
| 508 | { |
| 509 | struct fw_csr_iterator ci; |
| 510 | struct fw_unit *unit; |
| 511 | int key, value, i; |
| 512 | |
| 513 | i = 0; |
| 514 | fw_csr_iterator_init(&ci, &device->config_rom[5]); |
| 515 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
| 516 | if (key != (CSR_UNIT | CSR_DIRECTORY)) |
| 517 | continue; |
| 518 | |
| 519 | /* Get the address of the unit directory and try to |
| 520 | * match the drivers id_tables against it. */ |
| 521 | unit = kzalloc(sizeof *unit, GFP_KERNEL); |
| 522 | if (unit == NULL) { |
| 523 | fw_error("failed to allocate memory for unit\n"); |
| 524 | continue; |
| 525 | } |
| 526 | |
| 527 | unit->directory = ci.p + value - 1; |
| 528 | unit->device.bus = &fw_bus_type; |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 529 | unit->device.type = &fw_unit_type; |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 530 | unit->device.parent = &device->device; |
| 531 | snprintf(unit->device.bus_id, sizeof unit->device.bus_id, |
| 532 | "%s.%d", device->device.bus_id, i++); |
| 533 | |
Kristian Høgsberg | 6f2e53d | 2007-03-27 19:35:13 -0400 | [diff] [blame] | 534 | init_fw_attribute_group(&unit->device, |
| 535 | fw_unit_attributes, |
| 536 | &unit->attribute_group); |
Kristian Høgsberg | 7feb9cc | 2007-03-21 10:55:19 -0400 | [diff] [blame] | 537 | if (device_register(&unit->device) < 0) |
| 538 | goto skip_unit; |
| 539 | |
Kristian Høgsberg | 7feb9cc | 2007-03-21 10:55:19 -0400 | [diff] [blame] | 540 | continue; |
| 541 | |
Kristian Høgsberg | 7feb9cc | 2007-03-21 10:55:19 -0400 | [diff] [blame] | 542 | skip_unit: |
| 543 | kfree(unit); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 544 | } |
| 545 | } |
| 546 | |
| 547 | static int shutdown_unit(struct device *device, void *data) |
| 548 | { |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 549 | device_unregister(device); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 550 | |
| 551 | return 0; |
| 552 | } |
| 553 | |
Kristian Høgsberg | dde2b95 | 2007-04-17 11:51:57 -0400 | [diff] [blame] | 554 | static DECLARE_RWSEM(idr_rwsem); |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 555 | static DEFINE_IDR(fw_device_idr); |
| 556 | int fw_cdev_major; |
| 557 | |
| 558 | struct fw_device *fw_device_from_devt(dev_t devt) |
| 559 | { |
| 560 | struct fw_device *device; |
| 561 | |
Kristian Høgsberg | dde2b95 | 2007-04-17 11:51:57 -0400 | [diff] [blame] | 562 | down_read(&idr_rwsem); |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 563 | device = idr_find(&fw_device_idr, MINOR(devt)); |
Kristian Høgsberg | dde2b95 | 2007-04-17 11:51:57 -0400 | [diff] [blame] | 564 | up_read(&idr_rwsem); |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 565 | |
| 566 | return device; |
| 567 | } |
| 568 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 569 | static void fw_device_shutdown(struct work_struct *work) |
| 570 | { |
| 571 | struct fw_device *device = |
| 572 | container_of(work, struct fw_device, work.work); |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 573 | int minor = MINOR(device->device.devt); |
| 574 | |
Kristian Høgsberg | dde2b95 | 2007-04-17 11:51:57 -0400 | [diff] [blame] | 575 | down_write(&idr_rwsem); |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 576 | idr_remove(&fw_device_idr, minor); |
Kristian Høgsberg | dde2b95 | 2007-04-17 11:51:57 -0400 | [diff] [blame] | 577 | up_write(&idr_rwsem); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 578 | |
Kristian Høgsberg | 2603bf2 | 2007-03-07 12:12:48 -0500 | [diff] [blame] | 579 | fw_device_cdev_remove(device); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 580 | device_for_each_child(&device->device, NULL, shutdown_unit); |
| 581 | device_unregister(&device->device); |
| 582 | } |
| 583 | |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 584 | static struct device_type fw_device_type = { |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 585 | .release = fw_device_release, |
| 586 | }; |
| 587 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 588 | /* These defines control the retry behavior for reading the config |
| 589 | * rom. It shouldn't be necessary to tweak these; if the device |
| 590 | * doesn't respond to a config rom read within 10 seconds, it's not |
| 591 | * going to respond at all. As for the initial delay, a lot of |
| 592 | * devices will be able to respond within half a second after bus |
| 593 | * reset. On the other hand, it's not really worth being more |
| 594 | * aggressive than that, since it scales pretty well; if 10 devices |
| 595 | * are plugged in, they're all getting read within one second. */ |
| 596 | |
Kristian Høgsberg | c5dfd0a | 2007-03-27 01:43:43 -0400 | [diff] [blame] | 597 | #define MAX_RETRIES 10 |
| 598 | #define RETRY_DELAY (3 * HZ) |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 599 | #define INITIAL_DELAY (HZ / 2) |
| 600 | |
| 601 | static void fw_device_init(struct work_struct *work) |
| 602 | { |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 603 | struct fw_device *device = |
| 604 | container_of(work, struct fw_device, work.work); |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 605 | int minor, err; |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 606 | |
| 607 | /* All failure paths here set node->data to NULL, so that we |
| 608 | * don't try to do device_for_each_child() on a kfree()'d |
| 609 | * device. */ |
| 610 | |
| 611 | if (read_bus_info_block(device) < 0) { |
| 612 | if (device->config_rom_retries < MAX_RETRIES) { |
| 613 | device->config_rom_retries++; |
| 614 | schedule_delayed_work(&device->work, RETRY_DELAY); |
| 615 | } else { |
Stefan Richter | 907293d | 2007-01-23 21:11:43 +0100 | [diff] [blame] | 616 | fw_notify("giving up on config rom for node id %x\n", |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 617 | device->node_id); |
Kristian Høgsberg | 931c483 | 2007-01-26 00:38:45 -0500 | [diff] [blame] | 618 | if (device->node == device->card->root_node) |
| 619 | schedule_delayed_work(&device->card->work, 0); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 620 | fw_device_release(&device->device); |
| 621 | } |
| 622 | return; |
| 623 | } |
| 624 | |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 625 | err = -ENOMEM; |
Kristian Høgsberg | dde2b95 | 2007-04-17 11:51:57 -0400 | [diff] [blame] | 626 | down_write(&idr_rwsem); |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 627 | if (idr_pre_get(&fw_device_idr, GFP_KERNEL)) |
| 628 | err = idr_get_new(&fw_device_idr, device, &minor); |
Kristian Høgsberg | dde2b95 | 2007-04-17 11:51:57 -0400 | [diff] [blame] | 629 | up_write(&idr_rwsem); |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 630 | if (err < 0) |
| 631 | goto error; |
| 632 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 633 | device->device.bus = &fw_bus_type; |
Kristian Høgsberg | 21351db | 2007-03-20 20:58:33 -0400 | [diff] [blame] | 634 | device->device.type = &fw_device_type; |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 635 | device->device.parent = device->card->device; |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 636 | device->device.devt = MKDEV(fw_cdev_major, minor); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 637 | snprintf(device->device.bus_id, sizeof device->device.bus_id, |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 638 | "fw%d", minor); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 639 | |
Kristian Høgsberg | 6f2e53d | 2007-03-27 19:35:13 -0400 | [diff] [blame] | 640 | init_fw_attribute_group(&device->device, |
| 641 | fw_device_attributes, |
| 642 | &device->attribute_group); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 643 | if (device_add(&device->device)) { |
| 644 | fw_error("Failed to add device.\n"); |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 645 | goto error_with_cdev; |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 646 | } |
| 647 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 648 | create_units(device); |
| 649 | |
| 650 | /* Transition the device to running state. If it got pulled |
| 651 | * out from under us while we did the intialization work, we |
| 652 | * have to shut down the device again here. Normally, though, |
| 653 | * fw_node_event will be responsible for shutting it down when |
| 654 | * necessary. We have to use the atomic cmpxchg here to avoid |
| 655 | * racing with the FW_NODE_DESTROYED case in |
| 656 | * fw_node_event(). */ |
Stefan Richter | 641f879 | 2007-01-27 10:34:55 +0100 | [diff] [blame] | 657 | if (atomic_cmpxchg(&device->state, |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 658 | FW_DEVICE_INITIALIZING, |
| 659 | FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) |
| 660 | fw_device_shutdown(&device->work.work); |
| 661 | else |
| 662 | fw_notify("created new fw device %s (%d config rom retries)\n", |
| 663 | device->device.bus_id, device->config_rom_retries); |
| 664 | |
| 665 | /* Reschedule the IRM work if we just finished reading the |
| 666 | * root node config rom. If this races with a bus reset we |
| 667 | * just end up running the IRM work a couple of extra times - |
| 668 | * pretty harmless. */ |
| 669 | if (device->node == device->card->root_node) |
| 670 | schedule_delayed_work(&device->card->work, 0); |
| 671 | |
| 672 | return; |
| 673 | |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 674 | error_with_cdev: |
Kristian Høgsberg | dde2b95 | 2007-04-17 11:51:57 -0400 | [diff] [blame] | 675 | down_write(&idr_rwsem); |
Kristian Høgsberg | a3aca3d | 2007-03-07 12:12:44 -0500 | [diff] [blame] | 676 | idr_remove(&fw_device_idr, minor); |
Kristian Høgsberg | dde2b95 | 2007-04-17 11:51:57 -0400 | [diff] [blame] | 677 | up_write(&idr_rwsem); |
Stefan Richter | 373b2ed | 2007-03-04 14:45:18 +0100 | [diff] [blame] | 678 | error: |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 679 | put_device(&device->device); |
| 680 | } |
| 681 | |
| 682 | static int update_unit(struct device *dev, void *data) |
| 683 | { |
| 684 | struct fw_unit *unit = fw_unit(dev); |
| 685 | struct fw_driver *driver = (struct fw_driver *)dev->driver; |
| 686 | |
Kristian Høgsberg | 015b066 | 2007-03-19 11:37:16 -0400 | [diff] [blame] | 687 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
| 688 | down(&dev->sem); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 689 | driver->update(unit); |
Kristian Høgsberg | 015b066 | 2007-03-19 11:37:16 -0400 | [diff] [blame] | 690 | up(&dev->sem); |
| 691 | } |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 692 | |
| 693 | return 0; |
| 694 | } |
| 695 | |
Kristian Høgsberg | 5f48047 | 2007-03-07 12:12:39 -0500 | [diff] [blame] | 696 | static void fw_device_update(struct work_struct *work) |
| 697 | { |
| 698 | struct fw_device *device = |
| 699 | container_of(work, struct fw_device, work.work); |
| 700 | |
Kristian Høgsberg | 97bd9ef | 2007-03-07 12:12:41 -0500 | [diff] [blame] | 701 | fw_device_cdev_update(device); |
Kristian Høgsberg | 5f48047 | 2007-03-07 12:12:39 -0500 | [diff] [blame] | 702 | device_for_each_child(&device->device, NULL, update_unit); |
| 703 | } |
| 704 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 705 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
| 706 | { |
| 707 | struct fw_device *device; |
| 708 | |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 709 | switch (event) { |
| 710 | case FW_NODE_CREATED: |
| 711 | case FW_NODE_LINK_ON: |
| 712 | if (!node->link_on) |
| 713 | break; |
| 714 | |
| 715 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
| 716 | if (device == NULL) |
| 717 | break; |
| 718 | |
| 719 | /* Do minimal intialization of the device here, the |
| 720 | * rest will happen in fw_device_init(). We need the |
| 721 | * card and node so we can read the config rom and we |
| 722 | * need to do device_initialize() now so |
| 723 | * device_for_each_child() in FW_NODE_UPDATED is |
| 724 | * doesn't freak out. */ |
| 725 | device_initialize(&device->device); |
Stefan Richter | 641f879 | 2007-01-27 10:34:55 +0100 | [diff] [blame] | 726 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 727 | device->card = fw_card_get(card); |
| 728 | device->node = fw_node_get(node); |
| 729 | device->node_id = node->node_id; |
| 730 | device->generation = card->generation; |
Kristian Høgsberg | 97bd9ef | 2007-03-07 12:12:41 -0500 | [diff] [blame] | 731 | INIT_LIST_HEAD(&device->client_list); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 732 | |
| 733 | /* Set the node data to point back to this device so |
| 734 | * FW_NODE_UPDATED callbacks can update the node_id |
| 735 | * and generation for the device. */ |
| 736 | node->data = device; |
| 737 | |
| 738 | /* Many devices are slow to respond after bus resets, |
| 739 | * especially if they are bus powered and go through |
| 740 | * power-up after getting plugged in. We schedule the |
| 741 | * first config rom scan half a second after bus reset. */ |
| 742 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
| 743 | schedule_delayed_work(&device->work, INITIAL_DELAY); |
| 744 | break; |
| 745 | |
| 746 | case FW_NODE_UPDATED: |
| 747 | if (!node->link_on || node->data == NULL) |
| 748 | break; |
| 749 | |
| 750 | device = node->data; |
| 751 | device->node_id = node->node_id; |
| 752 | device->generation = card->generation; |
Kristian Høgsberg | 5f48047 | 2007-03-07 12:12:39 -0500 | [diff] [blame] | 753 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
| 754 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); |
| 755 | schedule_delayed_work(&device->work, 0); |
| 756 | } |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 757 | break; |
| 758 | |
| 759 | case FW_NODE_DESTROYED: |
| 760 | case FW_NODE_LINK_OFF: |
| 761 | if (!node->data) |
| 762 | break; |
| 763 | |
| 764 | /* Destroy the device associated with the node. There |
| 765 | * are two cases here: either the device is fully |
| 766 | * initialized (FW_DEVICE_RUNNING) or we're in the |
| 767 | * process of reading its config rom |
| 768 | * (FW_DEVICE_INITIALIZING). If it is fully |
| 769 | * initialized we can reuse device->work to schedule a |
| 770 | * full fw_device_shutdown(). If not, there's work |
| 771 | * scheduled to read it's config rom, and we just put |
| 772 | * the device in shutdown state to have that code fail |
| 773 | * to create the device. */ |
| 774 | device = node->data; |
Stefan Richter | 641f879 | 2007-01-27 10:34:55 +0100 | [diff] [blame] | 775 | if (atomic_xchg(&device->state, |
Kristian Høgsberg | 5f48047 | 2007-03-07 12:12:39 -0500 | [diff] [blame] | 776 | FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { |
| 777 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
Kristian Høgsberg | 19a15b9 | 2006-12-19 19:58:31 -0500 | [diff] [blame] | 778 | schedule_delayed_work(&device->work, 0); |
| 779 | } |
| 780 | break; |
| 781 | } |
| 782 | } |