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- /*
- * drivers/base/power/domain.c - Common code related to device power domains.
- *
- * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
- *
- * This file is released under the GPLv2.
- */
- #include <linux/delay.h>
- #include <linux/kernel.h>
- #include <linux/io.h>
- #include <linux/platform_device.h>
- #include <linux/pm_runtime.h>
- #include <linux/pm_domain.h>
- #include <linux/pm_qos.h>
- #include <linux/pm_clock.h>
- #include <linux/slab.h>
- #include <linux/err.h>
- #include <linux/sched.h>
- #include <linux/suspend.h>
- #include <linux/export.h>
- #define GENPD_RETRY_MAX_MS 250 /* Approximate */
- #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
- ({ \
- type (*__routine)(struct device *__d); \
- type __ret = (type)0; \
- \
- __routine = genpd->dev_ops.callback; \
- if (__routine) { \
- __ret = __routine(dev); \
- } \
- __ret; \
- })
- static LIST_HEAD(gpd_list);
- static DEFINE_MUTEX(gpd_list_lock);
- /*
- * Get the generic PM domain for a particular struct device.
- * This validates the struct device pointer, the PM domain pointer,
- * and checks that the PM domain pointer is a real generic PM domain.
- * Any failure results in NULL being returned.
- */
- struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
- {
- struct generic_pm_domain *genpd = NULL, *gpd;
- if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
- return NULL;
- mutex_lock(&gpd_list_lock);
- list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
- if (&gpd->domain == dev->pm_domain) {
- genpd = gpd;
- break;
- }
- }
- mutex_unlock(&gpd_list_lock);
- return genpd;
- }
- /*
- * This should only be used where we are certain that the pm_domain
- * attached to the device is a genpd domain.
- */
- static struct generic_pm_domain *dev_to_genpd(struct device *dev)
- {
- if (IS_ERR_OR_NULL(dev->pm_domain))
- return ERR_PTR(-EINVAL);
- return pd_to_genpd(dev->pm_domain);
- }
- static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev)
- {
- return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
- }
- static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev)
- {
- return GENPD_DEV_CALLBACK(genpd, int, start, dev);
- }
- static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
- {
- bool ret = false;
- if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
- ret = !!atomic_dec_and_test(&genpd->sd_count);
- return ret;
- }
- static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
- {
- atomic_inc(&genpd->sd_count);
- smp_mb__after_atomic();
- }
- static int genpd_power_on(struct generic_pm_domain *genpd, bool timed)
- {
- ktime_t time_start;
- s64 elapsed_ns;
- int ret;
- if (!genpd->power_on)
- return 0;
- if (!timed)
- return genpd->power_on(genpd);
- time_start = ktime_get();
- ret = genpd->power_on(genpd);
- if (ret)
- return ret;
- elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
- if (elapsed_ns <= genpd->power_on_latency_ns)
- return ret;
- genpd->power_on_latency_ns = elapsed_ns;
- genpd->max_off_time_changed = true;
- pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
- genpd->name, "on", elapsed_ns);
- return ret;
- }
- static int genpd_power_off(struct generic_pm_domain *genpd, bool timed)
- {
- ktime_t time_start;
- s64 elapsed_ns;
- int ret;
- if (!genpd->power_off)
- return 0;
- if (!timed)
- return genpd->power_off(genpd);
- time_start = ktime_get();
- ret = genpd->power_off(genpd);
- if (ret == -EBUSY)
- return ret;
- elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
- if (elapsed_ns <= genpd->power_off_latency_ns)
- return ret;
- genpd->power_off_latency_ns = elapsed_ns;
- genpd->max_off_time_changed = true;
- pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
- genpd->name, "off", elapsed_ns);
- return ret;
- }
- /**
- * genpd_queue_power_off_work - Queue up the execution of genpd_poweroff().
- * @genpd: PM domait to power off.
- *
- * Queue up the execution of genpd_poweroff() unless it's already been done
- * before.
- */
- static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
- {
- queue_work(pm_wq, &genpd->power_off_work);
- }
- static int genpd_poweron(struct generic_pm_domain *genpd);
- /**
- * __genpd_poweron - Restore power to a given PM domain and its masters.
- * @genpd: PM domain to power up.
- *
- * Restore power to @genpd and all of its masters so that it is possible to
- * resume a device belonging to it.
- */
- static int __genpd_poweron(struct generic_pm_domain *genpd)
- {
- struct gpd_link *link;
- int ret = 0;
- if (genpd->status == GPD_STATE_ACTIVE
- || (genpd->prepared_count > 0 && genpd->suspend_power_off))
- return 0;
- /*
- * The list is guaranteed not to change while the loop below is being
- * executed, unless one of the masters' .power_on() callbacks fiddles
- * with it.
- */
- list_for_each_entry(link, &genpd->slave_links, slave_node) {
- genpd_sd_counter_inc(link->master);
- ret = genpd_poweron(link->master);
- if (ret) {
- genpd_sd_counter_dec(link->master);
- goto err;
- }
- }
- ret = genpd_power_on(genpd, true);
- if (ret)
- goto err;
- genpd->status = GPD_STATE_ACTIVE;
- return 0;
- err:
- list_for_each_entry_continue_reverse(link,
- &genpd->slave_links,
- slave_node) {
- genpd_sd_counter_dec(link->master);
- genpd_queue_power_off_work(link->master);
- }
- return ret;
- }
- /**
- * genpd_poweron - Restore power to a given PM domain and its masters.
- * @genpd: PM domain to power up.
- */
- static int genpd_poweron(struct generic_pm_domain *genpd)
- {
- int ret;
- mutex_lock(&genpd->lock);
- ret = __genpd_poweron(genpd);
- mutex_unlock(&genpd->lock);
- return ret;
- }
- static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
- {
- return GENPD_DEV_CALLBACK(genpd, int, save_state, dev);
- }
- static int genpd_restore_dev(struct generic_pm_domain *genpd,
- struct device *dev)
- {
- return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev);
- }
- static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
- unsigned long val, void *ptr)
- {
- struct generic_pm_domain_data *gpd_data;
- struct device *dev;
- gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
- dev = gpd_data->base.dev;
- for (;;) {
- struct generic_pm_domain *genpd;
- struct pm_domain_data *pdd;
- spin_lock_irq(&dev->power.lock);
- pdd = dev->power.subsys_data ?
- dev->power.subsys_data->domain_data : NULL;
- if (pdd && pdd->dev) {
- to_gpd_data(pdd)->td.constraint_changed = true;
- genpd = dev_to_genpd(dev);
- } else {
- genpd = ERR_PTR(-ENODATA);
- }
- spin_unlock_irq(&dev->power.lock);
- if (!IS_ERR(genpd)) {
- mutex_lock(&genpd->lock);
- genpd->max_off_time_changed = true;
- mutex_unlock(&genpd->lock);
- }
- dev = dev->parent;
- if (!dev || dev->power.ignore_children)
- break;
- }
- return NOTIFY_DONE;
- }
- /**
- * genpd_poweroff - Remove power from a given PM domain.
- * @genpd: PM domain to power down.
- * @is_async: PM domain is powered down from a scheduled work
- *
- * If all of the @genpd's devices have been suspended and all of its subdomains
- * have been powered down, remove power from @genpd.
- */
- static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async)
- {
- struct pm_domain_data *pdd;
- struct gpd_link *link;
- unsigned int not_suspended = 0;
- /*
- * Do not try to power off the domain in the following situations:
- * (1) The domain is already in the "power off" state.
- * (2) System suspend is in progress.
- */
- if (genpd->status == GPD_STATE_POWER_OFF
- || genpd->prepared_count > 0)
- return 0;
- if (atomic_read(&genpd->sd_count) > 0)
- return -EBUSY;
- list_for_each_entry(pdd, &genpd->dev_list, list_node) {
- enum pm_qos_flags_status stat;
- stat = dev_pm_qos_flags(pdd->dev,
- PM_QOS_FLAG_NO_POWER_OFF
- | PM_QOS_FLAG_REMOTE_WAKEUP);
- if (stat > PM_QOS_FLAGS_NONE)
- return -EBUSY;
- if (!pm_runtime_suspended(pdd->dev) || pdd->dev->power.irq_safe)
- not_suspended++;
- }
- if (not_suspended > 1 || (not_suspended == 1 && is_async))
- return -EBUSY;
- if (genpd->gov && genpd->gov->power_down_ok) {
- if (!genpd->gov->power_down_ok(&genpd->domain))
- return -EAGAIN;
- }
- if (genpd->power_off) {
- int ret;
- if (atomic_read(&genpd->sd_count) > 0)
- return -EBUSY;
- /*
- * If sd_count > 0 at this point, one of the subdomains hasn't
- * managed to call genpd_poweron() for the master yet after
- * incrementing it. In that case genpd_poweron() will wait
- * for us to drop the lock, so we can call .power_off() and let
- * the genpd_poweron() restore power for us (this shouldn't
- * happen very often).
- */
- ret = genpd_power_off(genpd, true);
- if (ret)
- return ret;
- }
- genpd->status = GPD_STATE_POWER_OFF;
- list_for_each_entry(link, &genpd->slave_links, slave_node) {
- genpd_sd_counter_dec(link->master);
- genpd_queue_power_off_work(link->master);
- }
- return 0;
- }
- /**
- * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
- * @work: Work structure used for scheduling the execution of this function.
- */
- static void genpd_power_off_work_fn(struct work_struct *work)
- {
- struct generic_pm_domain *genpd;
- genpd = container_of(work, struct generic_pm_domain, power_off_work);
- mutex_lock(&genpd->lock);
- genpd_poweroff(genpd, true);
- mutex_unlock(&genpd->lock);
- }
- /**
- * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
- * @dev: Device to suspend.
- *
- * Carry out a runtime suspend of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a PM domain consisting of I/O devices.
- */
- static int pm_genpd_runtime_suspend(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- bool (*stop_ok)(struct device *__dev);
- struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
- bool runtime_pm = pm_runtime_enabled(dev);
- ktime_t time_start;
- s64 elapsed_ns;
- int ret;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- /*
- * A runtime PM centric subsystem/driver may re-use the runtime PM
- * callbacks for other purposes than runtime PM. In those scenarios
- * runtime PM is disabled. Under these circumstances, we shall skip
- * validating/measuring the PM QoS latency.
- */
- stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
- if (runtime_pm && stop_ok && !stop_ok(dev))
- return -EBUSY;
- /* Measure suspend latency. */
- if (runtime_pm)
- time_start = ktime_get();
- ret = genpd_save_dev(genpd, dev);
- if (ret)
- return ret;
- ret = genpd_stop_dev(genpd, dev);
- if (ret) {
- genpd_restore_dev(genpd, dev);
- return ret;
- }
- /* Update suspend latency value if the measured time exceeds it. */
- if (runtime_pm) {
- elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
- if (elapsed_ns > td->suspend_latency_ns) {
- td->suspend_latency_ns = elapsed_ns;
- dev_dbg(dev, "suspend latency exceeded, %lld ns\n",
- elapsed_ns);
- genpd->max_off_time_changed = true;
- td->constraint_changed = true;
- }
- }
- /*
- * If power.irq_safe is set, this routine will be run with interrupts
- * off, so it can't use mutexes.
- */
- if (dev->power.irq_safe)
- return 0;
- mutex_lock(&genpd->lock);
- genpd_poweroff(genpd, false);
- mutex_unlock(&genpd->lock);
- return 0;
- }
- /**
- * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
- * @dev: Device to resume.
- *
- * Carry out a runtime resume of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a PM domain consisting of I/O devices.
- */
- static int pm_genpd_runtime_resume(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
- bool runtime_pm = pm_runtime_enabled(dev);
- ktime_t time_start;
- s64 elapsed_ns;
- int ret;
- bool timed = true;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- /* If power.irq_safe, the PM domain is never powered off. */
- if (dev->power.irq_safe) {
- timed = false;
- goto out;
- }
- mutex_lock(&genpd->lock);
- ret = __genpd_poweron(genpd);
- mutex_unlock(&genpd->lock);
- if (ret)
- return ret;
- out:
- /* Measure resume latency. */
- if (timed && runtime_pm)
- time_start = ktime_get();
- genpd_start_dev(genpd, dev);
- genpd_restore_dev(genpd, dev);
- /* Update resume latency value if the measured time exceeds it. */
- if (timed && runtime_pm) {
- elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
- if (elapsed_ns > td->resume_latency_ns) {
- td->resume_latency_ns = elapsed_ns;
- dev_dbg(dev, "resume latency exceeded, %lld ns\n",
- elapsed_ns);
- genpd->max_off_time_changed = true;
- td->constraint_changed = true;
- }
- }
- return 0;
- }
- static bool pd_ignore_unused;
- static int __init pd_ignore_unused_setup(char *__unused)
- {
- pd_ignore_unused = true;
- return 1;
- }
- __setup("pd_ignore_unused", pd_ignore_unused_setup);
- /**
- * genpd_poweroff_unused - Power off all PM domains with no devices in use.
- */
- static int __init genpd_poweroff_unused(void)
- {
- struct generic_pm_domain *genpd;
- if (pd_ignore_unused) {
- pr_warn("genpd: Not disabling unused power domains\n");
- return 0;
- }
- mutex_lock(&gpd_list_lock);
- list_for_each_entry(genpd, &gpd_list, gpd_list_node)
- genpd_queue_power_off_work(genpd);
- mutex_unlock(&gpd_list_lock);
- return 0;
- }
- late_initcall(genpd_poweroff_unused);
- #ifdef CONFIG_PM_SLEEP
- /**
- * pm_genpd_present - Check if the given PM domain has been initialized.
- * @genpd: PM domain to check.
- */
- static bool pm_genpd_present(const struct generic_pm_domain *genpd)
- {
- const struct generic_pm_domain *gpd;
- if (IS_ERR_OR_NULL(genpd))
- return false;
- list_for_each_entry(gpd, &gpd_list, gpd_list_node)
- if (gpd == genpd)
- return true;
- return false;
- }
- static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,
- struct device *dev)
- {
- return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev);
- }
- /**
- * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters.
- * @genpd: PM domain to power off, if possible.
- * @timed: True if latency measurements are allowed.
- *
- * Check if the given PM domain can be powered off (during system suspend or
- * hibernation) and do that if so. Also, in that case propagate to its masters.
- *
- * This function is only called in "noirq" and "syscore" stages of system power
- * transitions, so it need not acquire locks (all of the "noirq" callbacks are
- * executed sequentially, so it is guaranteed that it will never run twice in
- * parallel).
- */
- static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd,
- bool timed)
- {
- struct gpd_link *link;
- if (genpd->status == GPD_STATE_POWER_OFF)
- return;
- if (genpd->suspended_count != genpd->device_count
- || atomic_read(&genpd->sd_count) > 0)
- return;
- genpd_power_off(genpd, timed);
- genpd->status = GPD_STATE_POWER_OFF;
- list_for_each_entry(link, &genpd->slave_links, slave_node) {
- genpd_sd_counter_dec(link->master);
- pm_genpd_sync_poweroff(link->master, timed);
- }
- }
- /**
- * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters.
- * @genpd: PM domain to power on.
- * @timed: True if latency measurements are allowed.
- *
- * This function is only called in "noirq" and "syscore" stages of system power
- * transitions, so it need not acquire locks (all of the "noirq" callbacks are
- * executed sequentially, so it is guaranteed that it will never run twice in
- * parallel).
- */
- static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd,
- bool timed)
- {
- struct gpd_link *link;
- if (genpd->status == GPD_STATE_ACTIVE)
- return;
- list_for_each_entry(link, &genpd->slave_links, slave_node) {
- pm_genpd_sync_poweron(link->master, timed);
- genpd_sd_counter_inc(link->master);
- }
- genpd_power_on(genpd, timed);
- genpd->status = GPD_STATE_ACTIVE;
- }
- /**
- * resume_needed - Check whether to resume a device before system suspend.
- * @dev: Device to check.
- * @genpd: PM domain the device belongs to.
- *
- * There are two cases in which a device that can wake up the system from sleep
- * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled
- * to wake up the system and it has to remain active for this purpose while the
- * system is in the sleep state and (2) if the device is not enabled to wake up
- * the system from sleep states and it generally doesn't generate wakeup signals
- * by itself (those signals are generated on its behalf by other parts of the
- * system). In the latter case it may be necessary to reconfigure the device's
- * wakeup settings during system suspend, because it may have been set up to
- * signal remote wakeup from the system's working state as needed by runtime PM.
- * Return 'true' in either of the above cases.
- */
- static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd)
- {
- bool active_wakeup;
- if (!device_can_wakeup(dev))
- return false;
- active_wakeup = genpd_dev_active_wakeup(genpd, dev);
- return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
- }
- /**
- * pm_genpd_prepare - Start power transition of a device in a PM domain.
- * @dev: Device to start the transition of.
- *
- * Start a power transition of a device (during a system-wide power transition)
- * under the assumption that its pm_domain field points to the domain member of
- * an object of type struct generic_pm_domain representing a PM domain
- * consisting of I/O devices.
- */
- static int pm_genpd_prepare(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- int ret;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- /*
- * If a wakeup request is pending for the device, it should be woken up
- * at this point and a system wakeup event should be reported if it's
- * set up to wake up the system from sleep states.
- */
- pm_runtime_get_noresume(dev);
- if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
- pm_wakeup_event(dev, 0);
- if (pm_wakeup_pending()) {
- pm_runtime_put(dev);
- return -EBUSY;
- }
- if (resume_needed(dev, genpd))
- pm_runtime_resume(dev);
- mutex_lock(&genpd->lock);
- if (genpd->prepared_count++ == 0) {
- genpd->suspended_count = 0;
- genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
- }
- mutex_unlock(&genpd->lock);
- if (genpd->suspend_power_off) {
- pm_runtime_put_noidle(dev);
- return 0;
- }
- /*
- * The PM domain must be in the GPD_STATE_ACTIVE state at this point,
- * so genpd_poweron() will return immediately, but if the device
- * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need
- * to make it operational.
- */
- pm_runtime_resume(dev);
- __pm_runtime_disable(dev, false);
- ret = pm_generic_prepare(dev);
- if (ret) {
- mutex_lock(&genpd->lock);
- if (--genpd->prepared_count == 0)
- genpd->suspend_power_off = false;
- mutex_unlock(&genpd->lock);
- pm_runtime_enable(dev);
- }
- pm_runtime_put(dev);
- return ret;
- }
- /**
- * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
- * @dev: Device to suspend.
- *
- * Suspend a device under the assumption that its pm_domain field points to the
- * domain member of an object of type struct generic_pm_domain representing
- * a PM domain consisting of I/O devices.
- */
- static int pm_genpd_suspend(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev);
- }
- /**
- * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain.
- * @dev: Device to suspend.
- *
- * Carry out a late suspend of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a PM domain consisting of I/O devices.
- */
- static int pm_genpd_suspend_late(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev);
- }
- /**
- * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
- * @dev: Device to suspend.
- *
- * Stop the device and remove power from the domain if all devices in it have
- * been stopped.
- */
- static int pm_genpd_suspend_noirq(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- if (genpd->suspend_power_off
- || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
- return 0;
- genpd_stop_dev(genpd, dev);
- /*
- * Since all of the "noirq" callbacks are executed sequentially, it is
- * guaranteed that this function will never run twice in parallel for
- * the same PM domain, so it is not necessary to use locking here.
- */
- genpd->suspended_count++;
- pm_genpd_sync_poweroff(genpd, true);
- return 0;
- }
- /**
- * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain.
- * @dev: Device to resume.
- *
- * Restore power to the device's PM domain, if necessary, and start the device.
- */
- static int pm_genpd_resume_noirq(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- if (genpd->suspend_power_off
- || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
- return 0;
- /*
- * Since all of the "noirq" callbacks are executed sequentially, it is
- * guaranteed that this function will never run twice in parallel for
- * the same PM domain, so it is not necessary to use locking here.
- */
- pm_genpd_sync_poweron(genpd, true);
- genpd->suspended_count--;
- return genpd_start_dev(genpd, dev);
- }
- /**
- * pm_genpd_resume_early - Early resume of a device in an I/O PM domain.
- * @dev: Device to resume.
- *
- * Carry out an early resume of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a power domain consisting of I/O
- * devices.
- */
- static int pm_genpd_resume_early(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev);
- }
- /**
- * pm_genpd_resume - Resume of device in an I/O PM domain.
- * @dev: Device to resume.
- *
- * Resume a device under the assumption that its pm_domain field points to the
- * domain member of an object of type struct generic_pm_domain representing
- * a power domain consisting of I/O devices.
- */
- static int pm_genpd_resume(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- return genpd->suspend_power_off ? 0 : pm_generic_resume(dev);
- }
- /**
- * pm_genpd_freeze - Freezing a device in an I/O PM domain.
- * @dev: Device to freeze.
- *
- * Freeze a device under the assumption that its pm_domain field points to the
- * domain member of an object of type struct generic_pm_domain representing
- * a power domain consisting of I/O devices.
- */
- static int pm_genpd_freeze(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev);
- }
- /**
- * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain.
- * @dev: Device to freeze.
- *
- * Carry out a late freeze of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a power domain consisting of I/O
- * devices.
- */
- static int pm_genpd_freeze_late(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev);
- }
- /**
- * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
- * @dev: Device to freeze.
- *
- * Carry out a late freeze of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a power domain consisting of I/O
- * devices.
- */
- static int pm_genpd_freeze_noirq(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev);
- }
- /**
- * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
- * @dev: Device to thaw.
- *
- * Start the device, unless power has been removed from the domain already
- * before the system transition.
- */
- static int pm_genpd_thaw_noirq(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- return genpd->suspend_power_off ?
- 0 : genpd_start_dev(genpd, dev);
- }
- /**
- * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain.
- * @dev: Device to thaw.
- *
- * Carry out an early thaw of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a power domain consisting of I/O
- * devices.
- */
- static int pm_genpd_thaw_early(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev);
- }
- /**
- * pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
- * @dev: Device to thaw.
- *
- * Thaw a device under the assumption that its pm_domain field points to the
- * domain member of an object of type struct generic_pm_domain representing
- * a power domain consisting of I/O devices.
- */
- static int pm_genpd_thaw(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev);
- }
- /**
- * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
- * @dev: Device to resume.
- *
- * Make sure the domain will be in the same power state as before the
- * hibernation the system is resuming from and start the device if necessary.
- */
- static int pm_genpd_restore_noirq(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return -EINVAL;
- /*
- * Since all of the "noirq" callbacks are executed sequentially, it is
- * guaranteed that this function will never run twice in parallel for
- * the same PM domain, so it is not necessary to use locking here.
- *
- * At this point suspended_count == 0 means we are being run for the
- * first time for the given domain in the present cycle.
- */
- if (genpd->suspended_count++ == 0) {
- /*
- * The boot kernel might put the domain into arbitrary state,
- * so make it appear as powered off to pm_genpd_sync_poweron(),
- * so that it tries to power it on in case it was really off.
- */
- genpd->status = GPD_STATE_POWER_OFF;
- if (genpd->suspend_power_off) {
- /*
- * If the domain was off before the hibernation, make
- * sure it will be off going forward.
- */
- genpd_power_off(genpd, true);
- return 0;
- }
- }
- if (genpd->suspend_power_off)
- return 0;
- pm_genpd_sync_poweron(genpd, true);
- return genpd_start_dev(genpd, dev);
- }
- /**
- * pm_genpd_complete - Complete power transition of a device in a power domain.
- * @dev: Device to complete the transition of.
- *
- * Complete a power transition of a device (during a system-wide power
- * transition) under the assumption that its pm_domain field points to the
- * domain member of an object of type struct generic_pm_domain representing
- * a power domain consisting of I/O devices.
- */
- static void pm_genpd_complete(struct device *dev)
- {
- struct generic_pm_domain *genpd;
- bool run_complete;
- dev_dbg(dev, "%s()\n", __func__);
- genpd = dev_to_genpd(dev);
- if (IS_ERR(genpd))
- return;
- mutex_lock(&genpd->lock);
- run_complete = !genpd->suspend_power_off;
- if (--genpd->prepared_count == 0)
- genpd->suspend_power_off = false;
- mutex_unlock(&genpd->lock);
- if (run_complete) {
- pm_generic_complete(dev);
- pm_runtime_set_active(dev);
- pm_runtime_enable(dev);
- pm_request_idle(dev);
- }
- }
- /**
- * genpd_syscore_switch - Switch power during system core suspend or resume.
- * @dev: Device that normally is marked as "always on" to switch power for.
- *
- * This routine may only be called during the system core (syscore) suspend or
- * resume phase for devices whose "always on" flags are set.
- */
- static void genpd_syscore_switch(struct device *dev, bool suspend)
- {
- struct generic_pm_domain *genpd;
- genpd = dev_to_genpd(dev);
- if (!pm_genpd_present(genpd))
- return;
- if (suspend) {
- genpd->suspended_count++;
- pm_genpd_sync_poweroff(genpd, false);
- } else {
- pm_genpd_sync_poweron(genpd, false);
- genpd->suspended_count--;
- }
- }
- void pm_genpd_syscore_poweroff(struct device *dev)
- {
- genpd_syscore_switch(dev, true);
- }
- EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff);
- void pm_genpd_syscore_poweron(struct device *dev)
- {
- genpd_syscore_switch(dev, false);
- }
- EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
- #else /* !CONFIG_PM_SLEEP */
- #define pm_genpd_prepare NULL
- #define pm_genpd_suspend NULL
- #define pm_genpd_suspend_late NULL
- #define pm_genpd_suspend_noirq NULL
- #define pm_genpd_resume_early NULL
- #define pm_genpd_resume_noirq NULL
- #define pm_genpd_resume NULL
- #define pm_genpd_freeze NULL
- #define pm_genpd_freeze_late NULL
- #define pm_genpd_freeze_noirq NULL
- #define pm_genpd_thaw_early NULL
- #define pm_genpd_thaw_noirq NULL
- #define pm_genpd_thaw NULL
- #define pm_genpd_restore_noirq NULL
- #define pm_genpd_complete NULL
- #endif /* CONFIG_PM_SLEEP */
- static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
- struct generic_pm_domain *genpd,
- struct gpd_timing_data *td)
- {
- struct generic_pm_domain_data *gpd_data;
- int ret;
- ret = dev_pm_get_subsys_data(dev);
- if (ret)
- return ERR_PTR(ret);
- gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
- if (!gpd_data) {
- ret = -ENOMEM;
- goto err_put;
- }
- if (td)
- gpd_data->td = *td;
- gpd_data->base.dev = dev;
- gpd_data->td.constraint_changed = true;
- gpd_data->td.effective_constraint_ns = -1;
- gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
- spin_lock_irq(&dev->power.lock);
- if (dev->power.subsys_data->domain_data) {
- ret = -EINVAL;
- goto err_free;
- }
- dev->power.subsys_data->domain_data = &gpd_data->base;
- spin_unlock_irq(&dev->power.lock);
- return gpd_data;
- err_free:
- spin_unlock_irq(&dev->power.lock);
- kfree(gpd_data);
- err_put:
- dev_pm_put_subsys_data(dev);
- return ERR_PTR(ret);
- }
- static void genpd_free_dev_data(struct device *dev,
- struct generic_pm_domain_data *gpd_data)
- {
- spin_lock_irq(&dev->power.lock);
- dev->power.subsys_data->domain_data = NULL;
- spin_unlock_irq(&dev->power.lock);
- kfree(gpd_data);
- dev_pm_put_subsys_data(dev);
- }
- /**
- * __pm_genpd_add_device - Add a device to an I/O PM domain.
- * @genpd: PM domain to add the device to.
- * @dev: Device to be added.
- * @td: Set of PM QoS timing parameters to attach to the device.
- */
- int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
- struct gpd_timing_data *td)
- {
- struct generic_pm_domain_data *gpd_data;
- int ret = 0;
- dev_dbg(dev, "%s()\n", __func__);
- if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
- return -EINVAL;
- gpd_data = genpd_alloc_dev_data(dev, genpd, td);
- if (IS_ERR(gpd_data))
- return PTR_ERR(gpd_data);
- mutex_lock(&genpd->lock);
- if (genpd->prepared_count > 0) {
- ret = -EAGAIN;
- goto out;
- }
- ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
- if (ret)
- goto out;
- dev->pm_domain = &genpd->domain;
- genpd->device_count++;
- genpd->max_off_time_changed = true;
- list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
- out:
- mutex_unlock(&genpd->lock);
- if (ret)
- genpd_free_dev_data(dev, gpd_data);
- else
- dev_pm_qos_add_notifier(dev, &gpd_data->nb);
- return ret;
- }
- /**
- * pm_genpd_remove_device - Remove a device from an I/O PM domain.
- * @genpd: PM domain to remove the device from.
- * @dev: Device to be removed.
- */
- int pm_genpd_remove_device(struct generic_pm_domain *genpd,
- struct device *dev)
- {
- struct generic_pm_domain_data *gpd_data;
- struct pm_domain_data *pdd;
- int ret = 0;
- dev_dbg(dev, "%s()\n", __func__);
- if (!genpd || genpd != pm_genpd_lookup_dev(dev))
- return -EINVAL;
- /* The above validation also means we have existing domain_data. */
- pdd = dev->power.subsys_data->domain_data;
- gpd_data = to_gpd_data(pdd);
- dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
- mutex_lock(&genpd->lock);
- if (genpd->prepared_count > 0) {
- ret = -EAGAIN;
- goto out;
- }
- genpd->device_count--;
- genpd->max_off_time_changed = true;
- if (genpd->detach_dev)
- genpd->detach_dev(genpd, dev);
- dev->pm_domain = NULL;
- list_del_init(&pdd->list_node);
- mutex_unlock(&genpd->lock);
- genpd_free_dev_data(dev, gpd_data);
- return 0;
- out:
- mutex_unlock(&genpd->lock);
- dev_pm_qos_add_notifier(dev, &gpd_data->nb);
- return ret;
- }
- /**
- * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
- * @genpd: Master PM domain to add the subdomain to.
- * @subdomain: Subdomain to be added.
- */
- int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
- struct generic_pm_domain *subdomain)
- {
- struct gpd_link *link, *itr;
- int ret = 0;
- if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
- || genpd == subdomain)
- return -EINVAL;
- link = kzalloc(sizeof(*link), GFP_KERNEL);
- if (!link)
- return -ENOMEM;
- mutex_lock(&genpd->lock);
- mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
- if (genpd->status == GPD_STATE_POWER_OFF
- && subdomain->status != GPD_STATE_POWER_OFF) {
- ret = -EINVAL;
- goto out;
- }
- list_for_each_entry(itr, &genpd->master_links, master_node) {
- if (itr->slave == subdomain && itr->master == genpd) {
- ret = -EINVAL;
- goto out;
- }
- }
- link->master = genpd;
- list_add_tail(&link->master_node, &genpd->master_links);
- link->slave = subdomain;
- list_add_tail(&link->slave_node, &subdomain->slave_links);
- if (subdomain->status != GPD_STATE_POWER_OFF)
- genpd_sd_counter_inc(genpd);
- out:
- mutex_unlock(&subdomain->lock);
- mutex_unlock(&genpd->lock);
- if (ret)
- kfree(link);
- return ret;
- }
- EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
- /**
- * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
- * @genpd: Master PM domain to remove the subdomain from.
- * @subdomain: Subdomain to be removed.
- */
- int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
- struct generic_pm_domain *subdomain)
- {
- struct gpd_link *l, *link;
- int ret = -EINVAL;
- if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
- return -EINVAL;
- mutex_lock(&genpd->lock);
- if (!list_empty(&subdomain->master_links) || subdomain->device_count) {
- pr_warn("%s: unable to remove subdomain %s\n", genpd->name,
- subdomain->name);
- ret = -EBUSY;
- goto out;
- }
- list_for_each_entry_safe(link, l, &genpd->master_links, master_node) {
- if (link->slave != subdomain)
- continue;
- mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
- list_del(&link->master_node);
- list_del(&link->slave_node);
- kfree(link);
- if (subdomain->status != GPD_STATE_POWER_OFF)
- genpd_sd_counter_dec(genpd);
- mutex_unlock(&subdomain->lock);
- ret = 0;
- break;
- }
- out:
- mutex_unlock(&genpd->lock);
- return ret;
- }
- EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
- /* Default device callbacks for generic PM domains. */
- /**
- * pm_genpd_default_save_state - Default "save device state" for PM domains.
- * @dev: Device to handle.
- */
- static int pm_genpd_default_save_state(struct device *dev)
- {
- int (*cb)(struct device *__dev);
- if (dev->type && dev->type->pm)
- cb = dev->type->pm->runtime_suspend;
- else if (dev->class && dev->class->pm)
- cb = dev->class->pm->runtime_suspend;
- else if (dev->bus && dev->bus->pm)
- cb = dev->bus->pm->runtime_suspend;
- else
- cb = NULL;
- if (!cb && dev->driver && dev->driver->pm)
- cb = dev->driver->pm->runtime_suspend;
- return cb ? cb(dev) : 0;
- }
- /**
- * pm_genpd_default_restore_state - Default PM domains "restore device state".
- * @dev: Device to handle.
- */
- static int pm_genpd_default_restore_state(struct device *dev)
- {
- int (*cb)(struct device *__dev);
- if (dev->type && dev->type->pm)
- cb = dev->type->pm->runtime_resume;
- else if (dev->class && dev->class->pm)
- cb = dev->class->pm->runtime_resume;
- else if (dev->bus && dev->bus->pm)
- cb = dev->bus->pm->runtime_resume;
- else
- cb = NULL;
- if (!cb && dev->driver && dev->driver->pm)
- cb = dev->driver->pm->runtime_resume;
- return cb ? cb(dev) : 0;
- }
- /**
- * pm_genpd_init - Initialize a generic I/O PM domain object.
- * @genpd: PM domain object to initialize.
- * @gov: PM domain governor to associate with the domain (may be NULL).
- * @is_off: Initial value of the domain's power_is_off field.
- */
- void pm_genpd_init(struct generic_pm_domain *genpd,
- struct dev_power_governor *gov, bool is_off)
- {
- if (IS_ERR_OR_NULL(genpd))
- return;
- INIT_LIST_HEAD(&genpd->master_links);
- INIT_LIST_HEAD(&genpd->slave_links);
- INIT_LIST_HEAD(&genpd->dev_list);
- mutex_init(&genpd->lock);
- genpd->gov = gov;
- INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
- atomic_set(&genpd->sd_count, 0);
- genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
- genpd->device_count = 0;
- genpd->max_off_time_ns = -1;
- genpd->max_off_time_changed = true;
- genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
- genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
- genpd->domain.ops.prepare = pm_genpd_prepare;
- genpd->domain.ops.suspend = pm_genpd_suspend;
- genpd->domain.ops.suspend_late = pm_genpd_suspend_late;
- genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
- genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
- genpd->domain.ops.resume_early = pm_genpd_resume_early;
- genpd->domain.ops.resume = pm_genpd_resume;
- genpd->domain.ops.freeze = pm_genpd_freeze;
- genpd->domain.ops.freeze_late = pm_genpd_freeze_late;
- genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
- genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
- genpd->domain.ops.thaw_early = pm_genpd_thaw_early;
- genpd->domain.ops.thaw = pm_genpd_thaw;
- genpd->domain.ops.poweroff = pm_genpd_suspend;
- genpd->domain.ops.poweroff_late = pm_genpd_suspend_late;
- genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq;
- genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
- genpd->domain.ops.restore_early = pm_genpd_resume_early;
- genpd->domain.ops.restore = pm_genpd_resume;
- genpd->domain.ops.complete = pm_genpd_complete;
- genpd->dev_ops.save_state = pm_genpd_default_save_state;
- genpd->dev_ops.restore_state = pm_genpd_default_restore_state;
- if (genpd->flags & GENPD_FLAG_PM_CLK) {
- genpd->dev_ops.stop = pm_clk_suspend;
- genpd->dev_ops.start = pm_clk_resume;
- }
- mutex_lock(&gpd_list_lock);
- list_add(&genpd->gpd_list_node, &gpd_list);
- mutex_unlock(&gpd_list_lock);
- }
- EXPORT_SYMBOL_GPL(pm_genpd_init);
- #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
- /*
- * Device Tree based PM domain providers.
- *
- * The code below implements generic device tree based PM domain providers that
- * bind device tree nodes with generic PM domains registered in the system.
- *
- * Any driver that registers generic PM domains and needs to support binding of
- * devices to these domains is supposed to register a PM domain provider, which
- * maps a PM domain specifier retrieved from the device tree to a PM domain.
- *
- * Two simple mapping functions have been provided for convenience:
- * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
- * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by
- * index.
- */
- /**
- * struct of_genpd_provider - PM domain provider registration structure
- * @link: Entry in global list of PM domain providers
- * @node: Pointer to device tree node of PM domain provider
- * @xlate: Provider-specific xlate callback mapping a set of specifier cells
- * into a PM domain.
- * @data: context pointer to be passed into @xlate callback
- */
- struct of_genpd_provider {
- struct list_head link;
- struct device_node *node;
- genpd_xlate_t xlate;
- void *data;
- };
- /* List of registered PM domain providers. */
- static LIST_HEAD(of_genpd_providers);
- /* Mutex to protect the list above. */
- static DEFINE_MUTEX(of_genpd_mutex);
- /**
- * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping
- * @genpdspec: OF phandle args to map into a PM domain
- * @data: xlate function private data - pointer to struct generic_pm_domain
- *
- * This is a generic xlate function that can be used to model PM domains that
- * have their own device tree nodes. The private data of xlate function needs
- * to be a valid pointer to struct generic_pm_domain.
- */
- struct generic_pm_domain *__of_genpd_xlate_simple(
- struct of_phandle_args *genpdspec,
- void *data)
- {
- if (genpdspec->args_count != 0)
- return ERR_PTR(-EINVAL);
- return data;
- }
- EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple);
- /**
- * __of_genpd_xlate_onecell() - Xlate function using a single index.
- * @genpdspec: OF phandle args to map into a PM domain
- * @data: xlate function private data - pointer to struct genpd_onecell_data
- *
- * This is a generic xlate function that can be used to model simple PM domain
- * controllers that have one device tree node and provide multiple PM domains.
- * A single cell is used as an index into an array of PM domains specified in
- * the genpd_onecell_data struct when registering the provider.
- */
- struct generic_pm_domain *__of_genpd_xlate_onecell(
- struct of_phandle_args *genpdspec,
- void *data)
- {
- struct genpd_onecell_data *genpd_data = data;
- unsigned int idx = genpdspec->args[0];
- if (genpdspec->args_count != 1)
- return ERR_PTR(-EINVAL);
- if (idx >= genpd_data->num_domains) {
- pr_err("%s: invalid domain index %u\n", __func__, idx);
- return ERR_PTR(-EINVAL);
- }
- if (!genpd_data->domains[idx])
- return ERR_PTR(-ENOENT);
- return genpd_data->domains[idx];
- }
- EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell);
- /**
- * __of_genpd_add_provider() - Register a PM domain provider for a node
- * @np: Device node pointer associated with the PM domain provider.
- * @xlate: Callback for decoding PM domain from phandle arguments.
- * @data: Context pointer for @xlate callback.
- */
- int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
- void *data)
- {
- struct of_genpd_provider *cp;
- cp = kzalloc(sizeof(*cp), GFP_KERNEL);
- if (!cp)
- return -ENOMEM;
- cp->node = of_node_get(np);
- cp->data = data;
- cp->xlate = xlate;
- mutex_lock(&of_genpd_mutex);
- list_add(&cp->link, &of_genpd_providers);
- mutex_unlock(&of_genpd_mutex);
- pr_debug("Added domain provider from %s\n", np->full_name);
- return 0;
- }
- EXPORT_SYMBOL_GPL(__of_genpd_add_provider);
- /**
- * of_genpd_del_provider() - Remove a previously registered PM domain provider
- * @np: Device node pointer associated with the PM domain provider
- */
- void of_genpd_del_provider(struct device_node *np)
- {
- struct of_genpd_provider *cp, *tmp;
- mutex_lock(&of_genpd_mutex);
- list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) {
- if (cp->node == np) {
- list_del(&cp->link);
- of_node_put(cp->node);
- kfree(cp);
- break;
- }
- }
- mutex_unlock(&of_genpd_mutex);
- }
- EXPORT_SYMBOL_GPL(of_genpd_del_provider);
- /**
- * of_genpd_get_from_provider() - Look-up PM domain
- * @genpdspec: OF phandle args to use for look-up
- *
- * Looks for a PM domain provider under the node specified by @genpdspec and if
- * found, uses xlate function of the provider to map phandle args to a PM
- * domain.
- *
- * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
- * on failure.
- */
- struct generic_pm_domain *of_genpd_get_from_provider(
- struct of_phandle_args *genpdspec)
- {
- struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
- struct of_genpd_provider *provider;
- mutex_lock(&of_genpd_mutex);
- /* Check if we have such a provider in our array */
- list_for_each_entry(provider, &of_genpd_providers, link) {
- if (provider->node == genpdspec->np)
- genpd = provider->xlate(genpdspec, provider->data);
- if (!IS_ERR(genpd))
- break;
- }
- mutex_unlock(&of_genpd_mutex);
- return genpd;
- }
- EXPORT_SYMBOL_GPL(of_genpd_get_from_provider);
- /**
- * genpd_dev_pm_detach - Detach a device from its PM domain.
- * @dev: Device to detach.
- * @power_off: Currently not used
- *
- * Try to locate a corresponding generic PM domain, which the device was
- * attached to previously. If such is found, the device is detached from it.
- */
- static void genpd_dev_pm_detach(struct device *dev, bool power_off)
- {
- struct generic_pm_domain *pd;
- unsigned int i;
- int ret = 0;
- pd = pm_genpd_lookup_dev(dev);
- if (!pd)
- return;
- dev_dbg(dev, "removing from PM domain %s\n", pd->name);
- for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
- ret = pm_genpd_remove_device(pd, dev);
- if (ret != -EAGAIN)
- break;
- mdelay(i);
- cond_resched();
- }
- if (ret < 0) {
- dev_err(dev, "failed to remove from PM domain %s: %d",
- pd->name, ret);
- return;
- }
- /* Check if PM domain can be powered off after removing this device. */
- genpd_queue_power_off_work(pd);
- }
- static void genpd_dev_pm_sync(struct device *dev)
- {
- struct generic_pm_domain *pd;
- pd = dev_to_genpd(dev);
- if (IS_ERR(pd))
- return;
- genpd_queue_power_off_work(pd);
- }
- /**
- * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
- * @dev: Device to attach.
- *
- * Parse device's OF node to find a PM domain specifier. If such is found,
- * attaches the device to retrieved pm_domain ops.
- *
- * Both generic and legacy Samsung-specific DT bindings are supported to keep
- * backwards compatibility with existing DTBs.
- *
- * Returns 0 on successfully attached PM domain or negative error code. Note
- * that if a power-domain exists for the device, but it cannot be found or
- * turned on, then return -EPROBE_DEFER to ensure that the device is not
- * probed and to re-try again later.
- */
- int genpd_dev_pm_attach(struct device *dev)
- {
- struct of_phandle_args pd_args;
- struct generic_pm_domain *pd;
- unsigned int i;
- int ret;
- if (!dev->of_node)
- return -ENODEV;
- if (dev->pm_domain)
- return -EEXIST;
- ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
- "#power-domain-cells", 0, &pd_args);
- if (ret < 0) {
- if (ret != -ENOENT)
- return ret;
- /*
- * Try legacy Samsung-specific bindings
- * (for backwards compatibility of DT ABI)
- */
- pd_args.args_count = 0;
- pd_args.np = of_parse_phandle(dev->of_node,
- "samsung,power-domain", 0);
- if (!pd_args.np)
- return -ENOENT;
- }
- pd = of_genpd_get_from_provider(&pd_args);
- of_node_put(pd_args.np);
- if (IS_ERR(pd)) {
- dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
- __func__, PTR_ERR(pd));
- return -EPROBE_DEFER;
- }
- dev_dbg(dev, "adding to PM domain %s\n", pd->name);
- for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
- ret = pm_genpd_add_device(pd, dev);
- if (ret != -EAGAIN)
- break;
- mdelay(i);
- cond_resched();
- }
- if (ret < 0) {
- dev_err(dev, "failed to add to PM domain %s: %d",
- pd->name, ret);
- goto out;
- }
- dev->pm_domain->detach = genpd_dev_pm_detach;
- dev->pm_domain->sync = genpd_dev_pm_sync;
- ret = genpd_poweron(pd);
- out:
- return ret ? -EPROBE_DEFER : 0;
- }
- EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
- #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
- /*** debugfs support ***/
- #ifdef CONFIG_PM_ADVANCED_DEBUG
- #include <linux/pm.h>
- #include <linux/device.h>
- #include <linux/debugfs.h>
- #include <linux/seq_file.h>
- #include <linux/init.h>
- #include <linux/kobject.h>
- static struct dentry *pm_genpd_debugfs_dir;
- /*
- * TODO: This function is a slightly modified version of rtpm_status_show
- * from sysfs.c, so generalize it.
- */
- static void rtpm_status_str(struct seq_file *s, struct device *dev)
- {
- static const char * const status_lookup[] = {
- [RPM_ACTIVE] = "active",
- [RPM_RESUMING] = "resuming",
- [RPM_SUSPENDED] = "suspended",
- [RPM_SUSPENDING] = "suspending"
- };
- const char *p = "";
- if (dev->power.runtime_error)
- p = "error";
- else if (dev->power.disable_depth)
- p = "unsupported";
- else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
- p = status_lookup[dev->power.runtime_status];
- else
- WARN_ON(1);
- seq_puts(s, p);
- }
- static int pm_genpd_summary_one(struct seq_file *s,
- struct generic_pm_domain *genpd)
- {
- static const char * const status_lookup[] = {
- [GPD_STATE_ACTIVE] = "on",
- [GPD_STATE_POWER_OFF] = "off"
- };
- struct pm_domain_data *pm_data;
- const char *kobj_path;
- struct gpd_link *link;
- int ret;
- ret = mutex_lock_interruptible(&genpd->lock);
- if (ret)
- return -ERESTARTSYS;
- if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
- goto exit;
- seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]);
- /*
- * Modifications on the list require holding locks on both
- * master and slave, so we are safe.
- * Also genpd->name is immutable.
- */
- list_for_each_entry(link, &genpd->master_links, master_node) {
- seq_printf(s, "%s", link->slave->name);
- if (!list_is_last(&link->master_node, &genpd->master_links))
- seq_puts(s, ", ");
- }
- list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
- kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL);
- if (kobj_path == NULL)
- continue;
- seq_printf(s, "\n %-50s ", kobj_path);
- rtpm_status_str(s, pm_data->dev);
- kfree(kobj_path);
- }
- seq_puts(s, "\n");
- exit:
- mutex_unlock(&genpd->lock);
- return 0;
- }
- static int pm_genpd_summary_show(struct seq_file *s, void *data)
- {
- struct generic_pm_domain *genpd;
- int ret = 0;
- seq_puts(s, "domain status slaves\n");
- seq_puts(s, " /device runtime status\n");
- seq_puts(s, "----------------------------------------------------------------------\n");
- ret = mutex_lock_interruptible(&gpd_list_lock);
- if (ret)
- return -ERESTARTSYS;
- list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
- ret = pm_genpd_summary_one(s, genpd);
- if (ret)
- break;
- }
- mutex_unlock(&gpd_list_lock);
- return ret;
- }
- static int pm_genpd_summary_open(struct inode *inode, struct file *file)
- {
- return single_open(file, pm_genpd_summary_show, NULL);
- }
- static const struct file_operations pm_genpd_summary_fops = {
- .open = pm_genpd_summary_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
- };
- static int __init pm_genpd_debug_init(void)
- {
- struct dentry *d;
- pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
- if (!pm_genpd_debugfs_dir)
- return -ENOMEM;
- d = debugfs_create_file("pm_genpd_summary", S_IRUGO,
- pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops);
- if (!d)
- return -ENOMEM;
- return 0;
- }
- late_initcall(pm_genpd_debug_init);
- static void __exit pm_genpd_debug_exit(void)
- {
- debugfs_remove_recursive(pm_genpd_debugfs_dir);
- }
- __exitcall(pm_genpd_debug_exit);
- #endif /* CONFIG_PM_ADVANCED_DEBUG */
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