Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1 | /* |
| 2 | * drivers/base/power/domain.c - Common code related to device power domains. |
| 3 | * |
| 4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. |
| 5 | * |
| 6 | * This file is released under the GPLv2. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/io.h> |
| 12 | #include <linux/pm_runtime.h> |
| 13 | #include <linux/pm_domain.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/err.h> |
| 16 | |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 17 | #ifdef CONFIG_PM |
| 18 | |
| 19 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) |
| 20 | { |
| 21 | if (IS_ERR_OR_NULL(dev->pm_domain)) |
| 22 | return ERR_PTR(-EINVAL); |
| 23 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 24 | return pd_to_genpd(dev->pm_domain); |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 25 | } |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 26 | |
| 27 | static void genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
| 28 | { |
| 29 | if (!WARN_ON(genpd->sd_count == 0)) |
| 30 | genpd->sd_count--; |
| 31 | } |
| 32 | |
| 33 | /** |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 34 | * pm_genpd_poweron - Restore power to a given PM domain and its parents. |
| 35 | * @genpd: PM domain to power up. |
| 36 | * |
| 37 | * Restore power to @genpd and all of its parents so that it is possible to |
| 38 | * resume a device belonging to it. |
| 39 | */ |
Magnus Damm | 18b4f3f | 2011-07-10 10:39:14 +0200 | [diff] [blame] | 40 | int pm_genpd_poweron(struct generic_pm_domain *genpd) |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 41 | { |
| 42 | int ret = 0; |
| 43 | |
| 44 | start: |
| 45 | if (genpd->parent) |
| 46 | mutex_lock(&genpd->parent->lock); |
| 47 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); |
| 48 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 49 | if (!genpd->power_is_off |
| 50 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 51 | goto out; |
| 52 | |
| 53 | if (genpd->parent && genpd->parent->power_is_off) { |
| 54 | mutex_unlock(&genpd->lock); |
| 55 | mutex_unlock(&genpd->parent->lock); |
| 56 | |
| 57 | ret = pm_genpd_poweron(genpd->parent); |
| 58 | if (ret) |
| 59 | return ret; |
| 60 | |
| 61 | goto start; |
| 62 | } |
| 63 | |
| 64 | if (genpd->power_on) { |
| 65 | int ret = genpd->power_on(genpd); |
| 66 | if (ret) |
| 67 | goto out; |
| 68 | } |
| 69 | |
| 70 | genpd->power_is_off = false; |
| 71 | if (genpd->parent) |
| 72 | genpd->parent->sd_count++; |
| 73 | |
| 74 | out: |
| 75 | mutex_unlock(&genpd->lock); |
| 76 | if (genpd->parent) |
| 77 | mutex_unlock(&genpd->parent->lock); |
| 78 | |
| 79 | return ret; |
| 80 | } |
| 81 | |
| 82 | #endif /* CONFIG_PM */ |
| 83 | |
| 84 | #ifdef CONFIG_PM_RUNTIME |
| 85 | |
| 86 | /** |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 87 | * __pm_genpd_save_device - Save the pre-suspend state of a device. |
| 88 | * @dle: Device list entry of the device to save the state of. |
| 89 | * @genpd: PM domain the device belongs to. |
| 90 | */ |
| 91 | static int __pm_genpd_save_device(struct dev_list_entry *dle, |
| 92 | struct generic_pm_domain *genpd) |
| 93 | { |
| 94 | struct device *dev = dle->dev; |
| 95 | struct device_driver *drv = dev->driver; |
| 96 | int ret = 0; |
| 97 | |
| 98 | if (dle->need_restore) |
| 99 | return 0; |
| 100 | |
| 101 | if (drv && drv->pm && drv->pm->runtime_suspend) { |
| 102 | if (genpd->start_device) |
| 103 | genpd->start_device(dev); |
| 104 | |
| 105 | ret = drv->pm->runtime_suspend(dev); |
| 106 | |
| 107 | if (genpd->stop_device) |
| 108 | genpd->stop_device(dev); |
| 109 | } |
| 110 | |
| 111 | if (!ret) |
| 112 | dle->need_restore = true; |
| 113 | |
| 114 | return ret; |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. |
| 119 | * @dle: Device list entry of the device to restore the state of. |
| 120 | * @genpd: PM domain the device belongs to. |
| 121 | */ |
| 122 | static void __pm_genpd_restore_device(struct dev_list_entry *dle, |
| 123 | struct generic_pm_domain *genpd) |
| 124 | { |
| 125 | struct device *dev = dle->dev; |
| 126 | struct device_driver *drv = dev->driver; |
| 127 | |
| 128 | if (!dle->need_restore) |
| 129 | return; |
| 130 | |
| 131 | if (drv && drv->pm && drv->pm->runtime_resume) { |
| 132 | if (genpd->start_device) |
| 133 | genpd->start_device(dev); |
| 134 | |
| 135 | drv->pm->runtime_resume(dev); |
| 136 | |
| 137 | if (genpd->stop_device) |
| 138 | genpd->stop_device(dev); |
| 139 | } |
| 140 | |
| 141 | dle->need_restore = false; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * pm_genpd_poweroff - Remove power from a given PM domain. |
| 146 | * @genpd: PM domain to power down. |
| 147 | * |
| 148 | * If all of the @genpd's devices have been suspended and all of its subdomains |
| 149 | * have been powered down, run the runtime suspend callbacks provided by all of |
| 150 | * the @genpd's devices' drivers and remove power from @genpd. |
| 151 | */ |
| 152 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) |
| 153 | { |
| 154 | struct generic_pm_domain *parent; |
| 155 | struct dev_list_entry *dle; |
| 156 | unsigned int not_suspended; |
| 157 | int ret; |
| 158 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 159 | if (genpd->power_is_off || genpd->prepared_count > 0) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 160 | return 0; |
| 161 | |
| 162 | if (genpd->sd_count > 0) |
| 163 | return -EBUSY; |
| 164 | |
| 165 | not_suspended = 0; |
| 166 | list_for_each_entry(dle, &genpd->dev_list, node) |
| 167 | if (dle->dev->driver && !pm_runtime_suspended(dle->dev)) |
| 168 | not_suspended++; |
| 169 | |
| 170 | if (not_suspended > genpd->in_progress) |
| 171 | return -EBUSY; |
| 172 | |
| 173 | if (genpd->gov && genpd->gov->power_down_ok) { |
| 174 | if (!genpd->gov->power_down_ok(&genpd->domain)) |
| 175 | return -EAGAIN; |
| 176 | } |
| 177 | |
| 178 | list_for_each_entry_reverse(dle, &genpd->dev_list, node) { |
| 179 | ret = __pm_genpd_save_device(dle, genpd); |
| 180 | if (ret) |
| 181 | goto err_dev; |
| 182 | } |
| 183 | |
| 184 | if (genpd->power_off) |
| 185 | genpd->power_off(genpd); |
| 186 | |
| 187 | genpd->power_is_off = true; |
| 188 | |
| 189 | parent = genpd->parent; |
| 190 | if (parent) { |
| 191 | genpd_sd_counter_dec(parent); |
| 192 | if (parent->sd_count == 0) |
| 193 | queue_work(pm_wq, &parent->power_off_work); |
| 194 | } |
| 195 | |
| 196 | return 0; |
| 197 | |
| 198 | err_dev: |
| 199 | list_for_each_entry_continue(dle, &genpd->dev_list, node) |
| 200 | __pm_genpd_restore_device(dle, genpd); |
| 201 | |
| 202 | return ret; |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. |
| 207 | * @work: Work structure used for scheduling the execution of this function. |
| 208 | */ |
| 209 | static void genpd_power_off_work_fn(struct work_struct *work) |
| 210 | { |
| 211 | struct generic_pm_domain *genpd; |
| 212 | |
| 213 | genpd = container_of(work, struct generic_pm_domain, power_off_work); |
| 214 | |
| 215 | if (genpd->parent) |
| 216 | mutex_lock(&genpd->parent->lock); |
| 217 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); |
| 218 | pm_genpd_poweroff(genpd); |
| 219 | mutex_unlock(&genpd->lock); |
| 220 | if (genpd->parent) |
| 221 | mutex_unlock(&genpd->parent->lock); |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
| 226 | * @dev: Device to suspend. |
| 227 | * |
| 228 | * Carry out a runtime suspend of a device under the assumption that its |
| 229 | * pm_domain field points to the domain member of an object of type |
| 230 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
| 231 | */ |
| 232 | static int pm_genpd_runtime_suspend(struct device *dev) |
| 233 | { |
| 234 | struct generic_pm_domain *genpd; |
| 235 | |
| 236 | dev_dbg(dev, "%s()\n", __func__); |
| 237 | |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 238 | genpd = dev_to_genpd(dev); |
| 239 | if (IS_ERR(genpd)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 240 | return -EINVAL; |
| 241 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 242 | if (genpd->parent) |
| 243 | mutex_lock(&genpd->parent->lock); |
| 244 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); |
| 245 | |
| 246 | if (genpd->stop_device) { |
| 247 | int ret = genpd->stop_device(dev); |
| 248 | if (ret) |
| 249 | goto out; |
| 250 | } |
| 251 | genpd->in_progress++; |
| 252 | pm_genpd_poweroff(genpd); |
| 253 | genpd->in_progress--; |
| 254 | |
| 255 | out: |
| 256 | mutex_unlock(&genpd->lock); |
| 257 | if (genpd->parent) |
| 258 | mutex_unlock(&genpd->parent->lock); |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | /** |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 264 | * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
| 265 | * @dev: Device to resume. |
| 266 | * @genpd: PM domain the device belongs to. |
| 267 | */ |
| 268 | static void __pm_genpd_runtime_resume(struct device *dev, |
| 269 | struct generic_pm_domain *genpd) |
| 270 | { |
| 271 | struct dev_list_entry *dle; |
| 272 | |
| 273 | list_for_each_entry(dle, &genpd->dev_list, node) { |
| 274 | if (dle->dev == dev) { |
| 275 | __pm_genpd_restore_device(dle, genpd); |
| 276 | break; |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | if (genpd->start_device) |
| 281 | genpd->start_device(dev); |
| 282 | } |
| 283 | |
| 284 | /** |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 285 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
| 286 | * @dev: Device to resume. |
| 287 | * |
| 288 | * Carry out a runtime resume of a device under the assumption that its |
| 289 | * pm_domain field points to the domain member of an object of type |
| 290 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
| 291 | */ |
| 292 | static int pm_genpd_runtime_resume(struct device *dev) |
| 293 | { |
| 294 | struct generic_pm_domain *genpd; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 295 | int ret; |
| 296 | |
| 297 | dev_dbg(dev, "%s()\n", __func__); |
| 298 | |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 299 | genpd = dev_to_genpd(dev); |
| 300 | if (IS_ERR(genpd)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 301 | return -EINVAL; |
| 302 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 303 | ret = pm_genpd_poweron(genpd); |
| 304 | if (ret) |
| 305 | return ret; |
| 306 | |
| 307 | mutex_lock(&genpd->lock); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 308 | __pm_genpd_runtime_resume(dev, genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 309 | mutex_unlock(&genpd->lock); |
| 310 | |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | #else |
| 315 | |
| 316 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 317 | static inline void __pm_genpd_runtime_resume(struct device *dev, |
| 318 | struct generic_pm_domain *genpd) {} |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 319 | |
| 320 | #define pm_genpd_runtime_suspend NULL |
| 321 | #define pm_genpd_runtime_resume NULL |
| 322 | |
| 323 | #endif /* CONFIG_PM_RUNTIME */ |
| 324 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 325 | #ifdef CONFIG_PM_SLEEP |
| 326 | |
| 327 | /** |
| 328 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents. |
| 329 | * @genpd: PM domain to power off, if possible. |
| 330 | * |
| 331 | * Check if the given PM domain can be powered off (during system suspend or |
| 332 | * hibernation) and do that if so. Also, in that case propagate to its parent. |
| 333 | * |
| 334 | * This function is only called in "noirq" stages of system power transitions, |
| 335 | * so it need not acquire locks (all of the "noirq" callbacks are executed |
| 336 | * sequentially, so it is guaranteed that it will never run twice in parallel). |
| 337 | */ |
| 338 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) |
| 339 | { |
| 340 | struct generic_pm_domain *parent = genpd->parent; |
| 341 | |
| 342 | if (genpd->power_is_off) |
| 343 | return; |
| 344 | |
| 345 | if (genpd->suspended_count != genpd->device_count || genpd->sd_count > 0) |
| 346 | return; |
| 347 | |
| 348 | if (genpd->power_off) |
| 349 | genpd->power_off(genpd); |
| 350 | |
| 351 | genpd->power_is_off = true; |
| 352 | if (parent) { |
| 353 | genpd_sd_counter_dec(parent); |
| 354 | pm_genpd_sync_poweroff(parent); |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | /** |
| 359 | * pm_genpd_prepare - Start power transition of a device in a PM domain. |
| 360 | * @dev: Device to start the transition of. |
| 361 | * |
| 362 | * Start a power transition of a device (during a system-wide power transition) |
| 363 | * under the assumption that its pm_domain field points to the domain member of |
| 364 | * an object of type struct generic_pm_domain representing a PM domain |
| 365 | * consisting of I/O devices. |
| 366 | */ |
| 367 | static int pm_genpd_prepare(struct device *dev) |
| 368 | { |
| 369 | struct generic_pm_domain *genpd; |
| 370 | |
| 371 | dev_dbg(dev, "%s()\n", __func__); |
| 372 | |
| 373 | genpd = dev_to_genpd(dev); |
| 374 | if (IS_ERR(genpd)) |
| 375 | return -EINVAL; |
| 376 | |
| 377 | mutex_lock(&genpd->lock); |
| 378 | |
| 379 | if (genpd->prepared_count++ == 0) |
| 380 | genpd->suspend_power_off = genpd->power_is_off; |
| 381 | |
| 382 | if (genpd->suspend_power_off) { |
| 383 | mutex_unlock(&genpd->lock); |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | * If the device is in the (runtime) "suspended" state, call |
| 389 | * .start_device() for it, if defined. |
| 390 | */ |
| 391 | if (pm_runtime_suspended(dev)) |
| 392 | __pm_genpd_runtime_resume(dev, genpd); |
| 393 | |
| 394 | /* |
| 395 | * Do not check if runtime resume is pending at this point, because it |
| 396 | * has been taken care of already and if pm_genpd_poweron() ran at this |
| 397 | * point as a result of the check, it would deadlock. |
| 398 | */ |
| 399 | __pm_runtime_disable(dev, false); |
| 400 | |
| 401 | mutex_unlock(&genpd->lock); |
| 402 | |
| 403 | return pm_generic_prepare(dev); |
| 404 | } |
| 405 | |
| 406 | /** |
| 407 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. |
| 408 | * @dev: Device to suspend. |
| 409 | * |
| 410 | * Suspend a device under the assumption that its pm_domain field points to the |
| 411 | * domain member of an object of type struct generic_pm_domain representing |
| 412 | * a PM domain consisting of I/O devices. |
| 413 | */ |
| 414 | static int pm_genpd_suspend(struct device *dev) |
| 415 | { |
| 416 | struct generic_pm_domain *genpd; |
| 417 | |
| 418 | dev_dbg(dev, "%s()\n", __func__); |
| 419 | |
| 420 | genpd = dev_to_genpd(dev); |
| 421 | if (IS_ERR(genpd)) |
| 422 | return -EINVAL; |
| 423 | |
| 424 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. |
| 429 | * @dev: Device to suspend. |
| 430 | * |
| 431 | * Carry out a late suspend of a device under the assumption that its |
| 432 | * pm_domain field points to the domain member of an object of type |
| 433 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
| 434 | */ |
| 435 | static int pm_genpd_suspend_noirq(struct device *dev) |
| 436 | { |
| 437 | struct generic_pm_domain *genpd; |
| 438 | int ret; |
| 439 | |
| 440 | dev_dbg(dev, "%s()\n", __func__); |
| 441 | |
| 442 | genpd = dev_to_genpd(dev); |
| 443 | if (IS_ERR(genpd)) |
| 444 | return -EINVAL; |
| 445 | |
| 446 | if (genpd->suspend_power_off) |
| 447 | return 0; |
| 448 | |
| 449 | ret = pm_generic_suspend_noirq(dev); |
| 450 | if (ret) |
| 451 | return ret; |
| 452 | |
Rafael J. Wysocki | d4f2d87 | 2011-07-01 22:13:29 +0200 | [diff] [blame] | 453 | if (device_may_wakeup(dev) |
| 454 | && genpd->active_wakeup && genpd->active_wakeup(dev)) |
| 455 | return 0; |
| 456 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 457 | if (genpd->stop_device) |
| 458 | genpd->stop_device(dev); |
| 459 | |
| 460 | /* |
| 461 | * Since all of the "noirq" callbacks are executed sequentially, it is |
| 462 | * guaranteed that this function will never run twice in parallel for |
| 463 | * the same PM domain, so it is not necessary to use locking here. |
| 464 | */ |
| 465 | genpd->suspended_count++; |
| 466 | pm_genpd_sync_poweroff(genpd); |
| 467 | |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | /** |
| 472 | * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. |
| 473 | * @dev: Device to resume. |
| 474 | * |
| 475 | * Carry out an early resume of a device under the assumption that its |
| 476 | * pm_domain field points to the domain member of an object of type |
| 477 | * struct generic_pm_domain representing a power domain consisting of I/O |
| 478 | * devices. |
| 479 | */ |
| 480 | static int pm_genpd_resume_noirq(struct device *dev) |
| 481 | { |
| 482 | struct generic_pm_domain *genpd; |
| 483 | |
| 484 | dev_dbg(dev, "%s()\n", __func__); |
| 485 | |
| 486 | genpd = dev_to_genpd(dev); |
| 487 | if (IS_ERR(genpd)) |
| 488 | return -EINVAL; |
| 489 | |
| 490 | if (genpd->suspend_power_off) |
| 491 | return 0; |
| 492 | |
| 493 | /* |
| 494 | * Since all of the "noirq" callbacks are executed sequentially, it is |
| 495 | * guaranteed that this function will never run twice in parallel for |
| 496 | * the same PM domain, so it is not necessary to use locking here. |
| 497 | */ |
| 498 | pm_genpd_poweron(genpd); |
| 499 | genpd->suspended_count--; |
| 500 | if (genpd->start_device) |
| 501 | genpd->start_device(dev); |
| 502 | |
| 503 | return pm_generic_resume_noirq(dev); |
| 504 | } |
| 505 | |
| 506 | /** |
| 507 | * pm_genpd_resume - Resume a device belonging to an I/O power domain. |
| 508 | * @dev: Device to resume. |
| 509 | * |
| 510 | * Resume a device under the assumption that its pm_domain field points to the |
| 511 | * domain member of an object of type struct generic_pm_domain representing |
| 512 | * a power domain consisting of I/O devices. |
| 513 | */ |
| 514 | static int pm_genpd_resume(struct device *dev) |
| 515 | { |
| 516 | struct generic_pm_domain *genpd; |
| 517 | |
| 518 | dev_dbg(dev, "%s()\n", __func__); |
| 519 | |
| 520 | genpd = dev_to_genpd(dev); |
| 521 | if (IS_ERR(genpd)) |
| 522 | return -EINVAL; |
| 523 | |
| 524 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
| 525 | } |
| 526 | |
| 527 | /** |
| 528 | * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. |
| 529 | * @dev: Device to freeze. |
| 530 | * |
| 531 | * Freeze a device under the assumption that its pm_domain field points to the |
| 532 | * domain member of an object of type struct generic_pm_domain representing |
| 533 | * a power domain consisting of I/O devices. |
| 534 | */ |
| 535 | static int pm_genpd_freeze(struct device *dev) |
| 536 | { |
| 537 | struct generic_pm_domain *genpd; |
| 538 | |
| 539 | dev_dbg(dev, "%s()\n", __func__); |
| 540 | |
| 541 | genpd = dev_to_genpd(dev); |
| 542 | if (IS_ERR(genpd)) |
| 543 | return -EINVAL; |
| 544 | |
| 545 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
| 546 | } |
| 547 | |
| 548 | /** |
| 549 | * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. |
| 550 | * @dev: Device to freeze. |
| 551 | * |
| 552 | * Carry out a late freeze of a device under the assumption that its |
| 553 | * pm_domain field points to the domain member of an object of type |
| 554 | * struct generic_pm_domain representing a power domain consisting of I/O |
| 555 | * devices. |
| 556 | */ |
| 557 | static int pm_genpd_freeze_noirq(struct device *dev) |
| 558 | { |
| 559 | struct generic_pm_domain *genpd; |
| 560 | int ret; |
| 561 | |
| 562 | dev_dbg(dev, "%s()\n", __func__); |
| 563 | |
| 564 | genpd = dev_to_genpd(dev); |
| 565 | if (IS_ERR(genpd)) |
| 566 | return -EINVAL; |
| 567 | |
| 568 | if (genpd->suspend_power_off) |
| 569 | return 0; |
| 570 | |
| 571 | ret = pm_generic_freeze_noirq(dev); |
| 572 | if (ret) |
| 573 | return ret; |
| 574 | |
| 575 | if (genpd->stop_device) |
| 576 | genpd->stop_device(dev); |
| 577 | |
| 578 | return 0; |
| 579 | } |
| 580 | |
| 581 | /** |
| 582 | * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. |
| 583 | * @dev: Device to thaw. |
| 584 | * |
| 585 | * Carry out an early thaw of a device under the assumption that its |
| 586 | * pm_domain field points to the domain member of an object of type |
| 587 | * struct generic_pm_domain representing a power domain consisting of I/O |
| 588 | * devices. |
| 589 | */ |
| 590 | static int pm_genpd_thaw_noirq(struct device *dev) |
| 591 | { |
| 592 | struct generic_pm_domain *genpd; |
| 593 | |
| 594 | dev_dbg(dev, "%s()\n", __func__); |
| 595 | |
| 596 | genpd = dev_to_genpd(dev); |
| 597 | if (IS_ERR(genpd)) |
| 598 | return -EINVAL; |
| 599 | |
| 600 | if (genpd->suspend_power_off) |
| 601 | return 0; |
| 602 | |
| 603 | if (genpd->start_device) |
| 604 | genpd->start_device(dev); |
| 605 | |
| 606 | return pm_generic_thaw_noirq(dev); |
| 607 | } |
| 608 | |
| 609 | /** |
| 610 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. |
| 611 | * @dev: Device to thaw. |
| 612 | * |
| 613 | * Thaw a device under the assumption that its pm_domain field points to the |
| 614 | * domain member of an object of type struct generic_pm_domain representing |
| 615 | * a power domain consisting of I/O devices. |
| 616 | */ |
| 617 | static int pm_genpd_thaw(struct device *dev) |
| 618 | { |
| 619 | struct generic_pm_domain *genpd; |
| 620 | |
| 621 | dev_dbg(dev, "%s()\n", __func__); |
| 622 | |
| 623 | genpd = dev_to_genpd(dev); |
| 624 | if (IS_ERR(genpd)) |
| 625 | return -EINVAL; |
| 626 | |
| 627 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
| 628 | } |
| 629 | |
| 630 | /** |
| 631 | * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain. |
| 632 | * @dev: Device to suspend. |
| 633 | * |
| 634 | * Power off a device under the assumption that its pm_domain field points to |
| 635 | * the domain member of an object of type struct generic_pm_domain representing |
| 636 | * a PM domain consisting of I/O devices. |
| 637 | */ |
| 638 | static int pm_genpd_dev_poweroff(struct device *dev) |
| 639 | { |
| 640 | struct generic_pm_domain *genpd; |
| 641 | |
| 642 | dev_dbg(dev, "%s()\n", __func__); |
| 643 | |
| 644 | genpd = dev_to_genpd(dev); |
| 645 | if (IS_ERR(genpd)) |
| 646 | return -EINVAL; |
| 647 | |
| 648 | return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev); |
| 649 | } |
| 650 | |
| 651 | /** |
| 652 | * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain. |
| 653 | * @dev: Device to suspend. |
| 654 | * |
| 655 | * Carry out a late powering off of a device under the assumption that its |
| 656 | * pm_domain field points to the domain member of an object of type |
| 657 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
| 658 | */ |
| 659 | static int pm_genpd_dev_poweroff_noirq(struct device *dev) |
| 660 | { |
| 661 | struct generic_pm_domain *genpd; |
| 662 | int ret; |
| 663 | |
| 664 | dev_dbg(dev, "%s()\n", __func__); |
| 665 | |
| 666 | genpd = dev_to_genpd(dev); |
| 667 | if (IS_ERR(genpd)) |
| 668 | return -EINVAL; |
| 669 | |
| 670 | if (genpd->suspend_power_off) |
| 671 | return 0; |
| 672 | |
| 673 | ret = pm_generic_poweroff_noirq(dev); |
| 674 | if (ret) |
| 675 | return ret; |
| 676 | |
Rafael J. Wysocki | d4f2d87 | 2011-07-01 22:13:29 +0200 | [diff] [blame] | 677 | if (device_may_wakeup(dev) |
| 678 | && genpd->active_wakeup && genpd->active_wakeup(dev)) |
| 679 | return 0; |
| 680 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 681 | if (genpd->stop_device) |
| 682 | genpd->stop_device(dev); |
| 683 | |
| 684 | /* |
| 685 | * Since all of the "noirq" callbacks are executed sequentially, it is |
| 686 | * guaranteed that this function will never run twice in parallel for |
| 687 | * the same PM domain, so it is not necessary to use locking here. |
| 688 | */ |
| 689 | genpd->suspended_count++; |
| 690 | pm_genpd_sync_poweroff(genpd); |
| 691 | |
| 692 | return 0; |
| 693 | } |
| 694 | |
| 695 | /** |
| 696 | * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. |
| 697 | * @dev: Device to resume. |
| 698 | * |
| 699 | * Carry out an early restore of a device under the assumption that its |
| 700 | * pm_domain field points to the domain member of an object of type |
| 701 | * struct generic_pm_domain representing a power domain consisting of I/O |
| 702 | * devices. |
| 703 | */ |
| 704 | static int pm_genpd_restore_noirq(struct device *dev) |
| 705 | { |
| 706 | struct generic_pm_domain *genpd; |
| 707 | |
| 708 | dev_dbg(dev, "%s()\n", __func__); |
| 709 | |
| 710 | genpd = dev_to_genpd(dev); |
| 711 | if (IS_ERR(genpd)) |
| 712 | return -EINVAL; |
| 713 | |
| 714 | /* |
| 715 | * Since all of the "noirq" callbacks are executed sequentially, it is |
| 716 | * guaranteed that this function will never run twice in parallel for |
| 717 | * the same PM domain, so it is not necessary to use locking here. |
| 718 | */ |
| 719 | genpd->power_is_off = true; |
| 720 | if (genpd->suspend_power_off) { |
| 721 | /* |
| 722 | * The boot kernel might put the domain into the power on state, |
| 723 | * so make sure it really is powered off. |
| 724 | */ |
| 725 | if (genpd->power_off) |
| 726 | genpd->power_off(genpd); |
| 727 | return 0; |
| 728 | } |
| 729 | |
| 730 | pm_genpd_poweron(genpd); |
| 731 | genpd->suspended_count--; |
| 732 | if (genpd->start_device) |
| 733 | genpd->start_device(dev); |
| 734 | |
| 735 | return pm_generic_restore_noirq(dev); |
| 736 | } |
| 737 | |
| 738 | /** |
| 739 | * pm_genpd_restore - Restore a device belonging to an I/O power domain. |
| 740 | * @dev: Device to resume. |
| 741 | * |
| 742 | * Restore a device under the assumption that its pm_domain field points to the |
| 743 | * domain member of an object of type struct generic_pm_domain representing |
| 744 | * a power domain consisting of I/O devices. |
| 745 | */ |
| 746 | static int pm_genpd_restore(struct device *dev) |
| 747 | { |
| 748 | struct generic_pm_domain *genpd; |
| 749 | |
| 750 | dev_dbg(dev, "%s()\n", __func__); |
| 751 | |
| 752 | genpd = dev_to_genpd(dev); |
| 753 | if (IS_ERR(genpd)) |
| 754 | return -EINVAL; |
| 755 | |
| 756 | return genpd->suspend_power_off ? 0 : pm_generic_restore(dev); |
| 757 | } |
| 758 | |
| 759 | /** |
| 760 | * pm_genpd_complete - Complete power transition of a device in a power domain. |
| 761 | * @dev: Device to complete the transition of. |
| 762 | * |
| 763 | * Complete a power transition of a device (during a system-wide power |
| 764 | * transition) under the assumption that its pm_domain field points to the |
| 765 | * domain member of an object of type struct generic_pm_domain representing |
| 766 | * a power domain consisting of I/O devices. |
| 767 | */ |
| 768 | static void pm_genpd_complete(struct device *dev) |
| 769 | { |
| 770 | struct generic_pm_domain *genpd; |
| 771 | bool run_complete; |
| 772 | |
| 773 | dev_dbg(dev, "%s()\n", __func__); |
| 774 | |
| 775 | genpd = dev_to_genpd(dev); |
| 776 | if (IS_ERR(genpd)) |
| 777 | return; |
| 778 | |
| 779 | mutex_lock(&genpd->lock); |
| 780 | |
| 781 | run_complete = !genpd->suspend_power_off; |
| 782 | if (--genpd->prepared_count == 0) |
| 783 | genpd->suspend_power_off = false; |
| 784 | |
| 785 | mutex_unlock(&genpd->lock); |
| 786 | |
| 787 | if (run_complete) { |
| 788 | pm_generic_complete(dev); |
| 789 | pm_runtime_enable(dev); |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | #else |
| 794 | |
| 795 | #define pm_genpd_prepare NULL |
| 796 | #define pm_genpd_suspend NULL |
| 797 | #define pm_genpd_suspend_noirq NULL |
| 798 | #define pm_genpd_resume_noirq NULL |
| 799 | #define pm_genpd_resume NULL |
| 800 | #define pm_genpd_freeze NULL |
| 801 | #define pm_genpd_freeze_noirq NULL |
| 802 | #define pm_genpd_thaw_noirq NULL |
| 803 | #define pm_genpd_thaw NULL |
| 804 | #define pm_genpd_dev_poweroff_noirq NULL |
| 805 | #define pm_genpd_dev_poweroff NULL |
| 806 | #define pm_genpd_restore_noirq NULL |
| 807 | #define pm_genpd_restore NULL |
| 808 | #define pm_genpd_complete NULL |
| 809 | |
| 810 | #endif /* CONFIG_PM_SLEEP */ |
| 811 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 812 | /** |
| 813 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
| 814 | * @genpd: PM domain to add the device to. |
| 815 | * @dev: Device to be added. |
| 816 | */ |
| 817 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
| 818 | { |
| 819 | struct dev_list_entry *dle; |
| 820 | int ret = 0; |
| 821 | |
| 822 | dev_dbg(dev, "%s()\n", __func__); |
| 823 | |
| 824 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) |
| 825 | return -EINVAL; |
| 826 | |
| 827 | mutex_lock(&genpd->lock); |
| 828 | |
| 829 | if (genpd->power_is_off) { |
| 830 | ret = -EINVAL; |
| 831 | goto out; |
| 832 | } |
| 833 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 834 | if (genpd->prepared_count > 0) { |
| 835 | ret = -EAGAIN; |
| 836 | goto out; |
| 837 | } |
| 838 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 839 | list_for_each_entry(dle, &genpd->dev_list, node) |
| 840 | if (dle->dev == dev) { |
| 841 | ret = -EINVAL; |
| 842 | goto out; |
| 843 | } |
| 844 | |
| 845 | dle = kzalloc(sizeof(*dle), GFP_KERNEL); |
| 846 | if (!dle) { |
| 847 | ret = -ENOMEM; |
| 848 | goto out; |
| 849 | } |
| 850 | |
| 851 | dle->dev = dev; |
| 852 | dle->need_restore = false; |
| 853 | list_add_tail(&dle->node, &genpd->dev_list); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 854 | genpd->device_count++; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 855 | |
| 856 | spin_lock_irq(&dev->power.lock); |
| 857 | dev->pm_domain = &genpd->domain; |
| 858 | spin_unlock_irq(&dev->power.lock); |
| 859 | |
| 860 | out: |
| 861 | mutex_unlock(&genpd->lock); |
| 862 | |
| 863 | return ret; |
| 864 | } |
| 865 | |
| 866 | /** |
| 867 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. |
| 868 | * @genpd: PM domain to remove the device from. |
| 869 | * @dev: Device to be removed. |
| 870 | */ |
| 871 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, |
| 872 | struct device *dev) |
| 873 | { |
| 874 | struct dev_list_entry *dle; |
| 875 | int ret = -EINVAL; |
| 876 | |
| 877 | dev_dbg(dev, "%s()\n", __func__); |
| 878 | |
| 879 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) |
| 880 | return -EINVAL; |
| 881 | |
| 882 | mutex_lock(&genpd->lock); |
| 883 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 884 | if (genpd->prepared_count > 0) { |
| 885 | ret = -EAGAIN; |
| 886 | goto out; |
| 887 | } |
| 888 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 889 | list_for_each_entry(dle, &genpd->dev_list, node) { |
| 890 | if (dle->dev != dev) |
| 891 | continue; |
| 892 | |
| 893 | spin_lock_irq(&dev->power.lock); |
| 894 | dev->pm_domain = NULL; |
| 895 | spin_unlock_irq(&dev->power.lock); |
| 896 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 897 | genpd->device_count--; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 898 | list_del(&dle->node); |
| 899 | kfree(dle); |
| 900 | |
| 901 | ret = 0; |
| 902 | break; |
| 903 | } |
| 904 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 905 | out: |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 906 | mutex_unlock(&genpd->lock); |
| 907 | |
| 908 | return ret; |
| 909 | } |
| 910 | |
| 911 | /** |
| 912 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. |
| 913 | * @genpd: Master PM domain to add the subdomain to. |
| 914 | * @new_subdomain: Subdomain to be added. |
| 915 | */ |
| 916 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, |
| 917 | struct generic_pm_domain *new_subdomain) |
| 918 | { |
| 919 | struct generic_pm_domain *subdomain; |
| 920 | int ret = 0; |
| 921 | |
| 922 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain)) |
| 923 | return -EINVAL; |
| 924 | |
| 925 | mutex_lock(&genpd->lock); |
| 926 | |
| 927 | if (genpd->power_is_off && !new_subdomain->power_is_off) { |
| 928 | ret = -EINVAL; |
| 929 | goto out; |
| 930 | } |
| 931 | |
| 932 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { |
| 933 | if (subdomain == new_subdomain) { |
| 934 | ret = -EINVAL; |
| 935 | goto out; |
| 936 | } |
| 937 | } |
| 938 | |
| 939 | mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING); |
| 940 | |
| 941 | list_add_tail(&new_subdomain->sd_node, &genpd->sd_list); |
| 942 | new_subdomain->parent = genpd; |
| 943 | if (!subdomain->power_is_off) |
| 944 | genpd->sd_count++; |
| 945 | |
| 946 | mutex_unlock(&new_subdomain->lock); |
| 947 | |
| 948 | out: |
| 949 | mutex_unlock(&genpd->lock); |
| 950 | |
| 951 | return ret; |
| 952 | } |
| 953 | |
| 954 | /** |
| 955 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. |
| 956 | * @genpd: Master PM domain to remove the subdomain from. |
| 957 | * @target: Subdomain to be removed. |
| 958 | */ |
| 959 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, |
| 960 | struct generic_pm_domain *target) |
| 961 | { |
| 962 | struct generic_pm_domain *subdomain; |
| 963 | int ret = -EINVAL; |
| 964 | |
| 965 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target)) |
| 966 | return -EINVAL; |
| 967 | |
| 968 | mutex_lock(&genpd->lock); |
| 969 | |
| 970 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { |
| 971 | if (subdomain != target) |
| 972 | continue; |
| 973 | |
| 974 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
| 975 | |
| 976 | list_del(&subdomain->sd_node); |
| 977 | subdomain->parent = NULL; |
| 978 | if (!subdomain->power_is_off) |
| 979 | genpd_sd_counter_dec(genpd); |
| 980 | |
| 981 | mutex_unlock(&subdomain->lock); |
| 982 | |
| 983 | ret = 0; |
| 984 | break; |
| 985 | } |
| 986 | |
| 987 | mutex_unlock(&genpd->lock); |
| 988 | |
| 989 | return ret; |
| 990 | } |
| 991 | |
| 992 | /** |
| 993 | * pm_genpd_init - Initialize a generic I/O PM domain object. |
| 994 | * @genpd: PM domain object to initialize. |
| 995 | * @gov: PM domain governor to associate with the domain (may be NULL). |
| 996 | * @is_off: Initial value of the domain's power_is_off field. |
| 997 | */ |
| 998 | void pm_genpd_init(struct generic_pm_domain *genpd, |
| 999 | struct dev_power_governor *gov, bool is_off) |
| 1000 | { |
| 1001 | if (IS_ERR_OR_NULL(genpd)) |
| 1002 | return; |
| 1003 | |
| 1004 | INIT_LIST_HEAD(&genpd->sd_node); |
| 1005 | genpd->parent = NULL; |
| 1006 | INIT_LIST_HEAD(&genpd->dev_list); |
| 1007 | INIT_LIST_HEAD(&genpd->sd_list); |
| 1008 | mutex_init(&genpd->lock); |
| 1009 | genpd->gov = gov; |
| 1010 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); |
| 1011 | genpd->in_progress = 0; |
| 1012 | genpd->sd_count = 0; |
| 1013 | genpd->power_is_off = is_off; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1014 | genpd->device_count = 0; |
| 1015 | genpd->suspended_count = 0; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1016 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
| 1017 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; |
| 1018 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1019 | genpd->domain.ops.prepare = pm_genpd_prepare; |
| 1020 | genpd->domain.ops.suspend = pm_genpd_suspend; |
| 1021 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
| 1022 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; |
| 1023 | genpd->domain.ops.resume = pm_genpd_resume; |
| 1024 | genpd->domain.ops.freeze = pm_genpd_freeze; |
| 1025 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
| 1026 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; |
| 1027 | genpd->domain.ops.thaw = pm_genpd_thaw; |
| 1028 | genpd->domain.ops.poweroff = pm_genpd_dev_poweroff; |
| 1029 | genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq; |
| 1030 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
| 1031 | genpd->domain.ops.restore = pm_genpd_restore; |
| 1032 | genpd->domain.ops.complete = pm_genpd_complete; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1033 | } |