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PM: Introduce struct pm_subsys_data

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Introduce struct pm_subsys_data that may be subclassed by subsystems
to store subsystem-specific information related to the device.  Move
the clock management fields accessed through the power.subsys_data
pointer in struct device to the new strucutre.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki
2011-08-25 15:33:50 +02:00
parent 111058c3ff
commit 5c095a0e0d
5 changed files with 84 additions and 62 deletions
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122
drivers/base/power/clock_ops.c
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@@ -17,11 +17,6 @@
#ifdef CONFIG_PM
struct pm_clk_data {
struct list_head clock_list;
spinlock_t lock;
};
enum pce_status {
PCE_STATUS_NONE = 0,
PCE_STATUS_ACQUIRED,
@@ -36,11 +31,6 @@ struct pm_clock_entry {
enum pce_status status;
};
static struct pm_clk_data *__to_pcd(struct device *dev)
{
return dev ? dev->power.subsys_data : NULL;
}
/**
* pm_clk_add - Start using a device clock for power management.
* @dev: Device whose clock is going to be used for power management.
@@ -51,10 +41,10 @@ static struct pm_clk_data *__to_pcd(struct device *dev)
*/
int pm_clk_add(struct device *dev, const char *con_id)
{
struct pm_clk_data *pcd = __to_pcd(dev);
struct pm_subsys_data *psd = dev_to_psd(dev);
struct pm_clock_entry *ce;
if (!pcd)
if (!psd)
return -EINVAL;
ce = kzalloc(sizeof(*ce), GFP_KERNEL);
@@ -73,9 +63,9 @@ int pm_clk_add(struct device *dev, const char *con_id)
}
}
spin_lock_irq(&pcd->lock);
list_add_tail(&ce->node, &pcd->clock_list);
spin_unlock_irq(&pcd->lock);
spin_lock_irq(&psd->lock);
list_add_tail(&ce->node, &psd->clock_list);
spin_unlock_irq(&psd->lock);
return 0;
}
@@ -117,15 +107,15 @@ static void __pm_clk_remove(struct pm_clock_entry *ce)
*/
void pm_clk_remove(struct device *dev, const char *con_id)
{
struct pm_clk_data *pcd = __to_pcd(dev);
struct pm_subsys_data *psd = dev_to_psd(dev);
struct pm_clock_entry *ce;
if (!pcd)
if (!psd)
return;
spin_lock_irq(&pcd->lock);
spin_lock_irq(&psd->lock);
list_for_each_entry(ce, &pcd->clock_list, node) {
list_for_each_entry(ce, &psd->clock_list, node) {
if (!con_id && !ce->con_id) {
__pm_clk_remove(ce);
break;
@@ -137,29 +127,45 @@ void pm_clk_remove(struct device *dev, const char *con_id)
}
}
spin_unlock_irq(&pcd->lock);
spin_unlock_irq(&psd->lock);
}
/**
* pm_clk_init - Initialize a device's list of power management clocks.
* @dev: Device to initialize the list of PM clocks for.
*
* Allocate a struct pm_clk_data object, initialize its lock member and
* make the @dev's power.subsys_data field point to it.
* Initialize the lock and clock_list members of the device's pm_subsys_data
* object.
*/
int pm_clk_init(struct device *dev)
void pm_clk_init(struct device *dev)
{
struct pm_clk_data *pcd;
struct pm_subsys_data *psd = dev_to_psd(dev);
pcd = kzalloc(sizeof(*pcd), GFP_KERNEL);
if (!pcd) {
if (!psd)
return;
INIT_LIST_HEAD(&psd->clock_list);
spin_lock_init(&psd->lock);
}
/**
* pm_clk_create - Create and initialize a device's list of PM clocks.
* @dev: Device to create and initialize the list of PM clocks for.
*
* Allocate a struct pm_subsys_data object, initialize its lock and clock_list
* members and make the @dev's power.subsys_data field point to it.
*/
int pm_clk_create(struct device *dev)
{
struct pm_subsys_data *psd;
psd = kzalloc(sizeof(*psd), GFP_KERNEL);
if (!psd) {
dev_err(dev, "Not enough memory for PM clock data.\n");
return -ENOMEM;
}
INIT_LIST_HEAD(&pcd->clock_list);
spin_lock_init(&pcd->lock);
dev->power.subsys_data = pcd;
dev->power.subsys_data = psd;
pm_clk_init(dev);
return 0;
}
@@ -168,27 +174,27 @@ int pm_clk_init(struct device *dev)
* @dev: Device to destroy the list of PM clocks for.
*
* Clear the @dev's power.subsys_data field, remove the list of clock entries
* from the struct pm_clk_data object pointed to by it before and free
* from the struct pm_subsys_data object pointed to by it before and free
* that object.
*/
void pm_clk_destroy(struct device *dev)
{
struct pm_clk_data *pcd = __to_pcd(dev);
struct pm_subsys_data *psd = dev_to_psd(dev);
struct pm_clock_entry *ce, *c;
if (!pcd)
if (!psd)
return;
dev->power.subsys_data = NULL;
spin_lock_irq(&pcd->lock);
spin_lock_irq(&psd->lock);
list_for_each_entry_safe_reverse(ce, c, &pcd->clock_list, node)
list_for_each_entry_safe_reverse(ce, c, &psd->clock_list, node)
__pm_clk_remove(ce);
spin_unlock_irq(&pcd->lock);
spin_unlock_irq(&psd->lock);
kfree(pcd);
kfree(psd);
}
#endif /* CONFIG_PM */
@@ -218,18 +224,18 @@ static void pm_clk_acquire(struct device *dev,
*/
int pm_clk_suspend(struct device *dev)
{
struct pm_clk_data *pcd = __to_pcd(dev);
struct pm_subsys_data *psd = dev_to_psd(dev);
struct pm_clock_entry *ce;
unsigned long flags;
dev_dbg(dev, "%s()\n", __func__);
if (!pcd)
if (!psd)
return 0;
spin_lock_irqsave(&pcd->lock, flags);
spin_lock_irqsave(&psd->lock, flags);
list_for_each_entry_reverse(ce, &pcd->clock_list, node) {
list_for_each_entry_reverse(ce, &psd->clock_list, node) {
if (ce->status == PCE_STATUS_NONE)
pm_clk_acquire(dev, ce);
@@ -239,7 +245,7 @@ int pm_clk_suspend(struct device *dev)
}
}
spin_unlock_irqrestore(&pcd->lock, flags);
spin_unlock_irqrestore(&psd->lock, flags);
return 0;
}
@@ -250,18 +256,18 @@ int pm_clk_suspend(struct device *dev)
*/
int pm_clk_resume(struct device *dev)
{
struct pm_clk_data *pcd = __to_pcd(dev);
struct pm_subsys_data *psd = dev_to_psd(dev);
struct pm_clock_entry *ce;
unsigned long flags;
dev_dbg(dev, "%s()\n", __func__);
if (!pcd)
if (!psd)
return 0;
spin_lock_irqsave(&pcd->lock, flags);
spin_lock_irqsave(&psd->lock, flags);
list_for_each_entry(ce, &pcd->clock_list, node) {
list_for_each_entry(ce, &psd->clock_list, node) {
if (ce->status == PCE_STATUS_NONE)
pm_clk_acquire(dev, ce);
@@ -271,7 +277,7 @@ int pm_clk_resume(struct device *dev)
}
}
spin_unlock_irqrestore(&pcd->lock, flags);
spin_unlock_irqrestore(&psd->lock, flags);
return 0;
}
@@ -309,7 +315,7 @@ static int pm_clk_notify(struct notifier_block *nb,
if (dev->pm_domain)
break;
error = pm_clk_init(dev);
error = pm_clk_create(dev);
if (error)
break;
@@ -344,22 +350,22 @@ static int pm_clk_notify(struct notifier_block *nb,
*/
int pm_clk_suspend(struct device *dev)
{
struct pm_clk_data *pcd = __to_pcd(dev);
struct pm_subsys_data *psd = dev_to_psd(dev);
struct pm_clock_entry *ce;
unsigned long flags;
dev_dbg(dev, "%s()\n", __func__);
/* If there is no driver, the clocks are already disabled. */
if (!pcd || !dev->driver)
if (!psd || !dev->driver)
return 0;
spin_lock_irqsave(&pcd->lock, flags);
spin_lock_irqsave(&psd->lock, flags);
list_for_each_entry_reverse(ce, &pcd->clock_list, node)
list_for_each_entry_reverse(ce, &psd->clock_list, node)
clk_disable(ce->clk);
spin_unlock_irqrestore(&pcd->lock, flags);
spin_unlock_irqrestore(&psd->lock, flags);
return 0;
}
@@ -370,22 +376,22 @@ int pm_clk_suspend(struct device *dev)
*/
int pm_clk_resume(struct device *dev)
{
struct pm_clk_data *pcd = __to_pcd(dev);
struct pm_subsys_data *psd = dev_to_psd(dev);
struct pm_clock_entry *ce;
unsigned long flags;
dev_dbg(dev, "%s()\n", __func__);
/* If there is no driver, the clocks should remain disabled. */
if (!pcd || !dev->driver)
if (!psd || !dev->driver)
return 0;
spin_lock_irqsave(&pcd->lock, flags);
spin_lock_irqsave(&psd->lock, flags);
list_for_each_entry(ce, &pcd->clock_list, node)
list_for_each_entry(ce, &psd->clock_list, node)
clk_enable(ce->clk);
spin_unlock_irqrestore(&pcd->lock, flags);
spin_unlock_irqrestore(&psd->lock, flags);
return 0;
}