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/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
* Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
* Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
*
* UX500 common part of Power domain regulators (atomic regulators)
*/
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/regulator/driver.h>
/*
* power state reference count
*/
static int power_state_active_cnt; /* will initialize to zero */
static DEFINE_SPINLOCK(power_state_active_lock);
void power_state_active_enable(void)
{
unsigned long flags;
spin_lock_irqsave(&power_state_active_lock, flags);
power_state_active_cnt++;
spin_unlock_irqrestore(&power_state_active_lock, flags);
}
EXPORT_SYMBOL_GPL(power_state_active_enable);
int power_state_active_disable(void)
{
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&power_state_active_lock, flags);
if (power_state_active_cnt <= 0) {
pr_err("power state: unbalanced enable/disable calls\n");
ret = -EINVAL;
goto out;
}
power_state_active_cnt--;
out:
spin_unlock_irqrestore(&power_state_active_lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(power_state_active_disable);
/*
* Exported interface for CPUIdle only. This function is called when interrupts
* are turned off. Hence, no locking.
*/
int power_state_active_is_enabled(void)
{
return (power_state_active_cnt > 0);
}
EXPORT_SYMBOL_GPL(power_state_active_is_enabled);
struct ux500_regulator {
char *name;
void (*enable)(void);
int (*disable)(void);
};
/*
* Don't add any clients to this struct without checking with regulator
* responsible!
*/
static struct ux500_regulator ux500_atomic_regulators[] = {
{
.name = "dma40.0",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "ssp0",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "ssp1",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "spi0",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "spi1",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "spi2",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "spi3",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "cryp1",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
{
.name = "hash1",
.enable = power_state_active_enable,
.disable = power_state_active_disable,
},
};
struct ux500_regulator *__must_check ux500_regulator_get(struct device *dev)
{
int i;
for (i = 0; i < ARRAY_SIZE(ux500_atomic_regulators); i++) {
if (!strcmp(dev_name(dev), ux500_atomic_regulators[i].name))
return &ux500_atomic_regulators[i];
}
return ERR_PTR(-EINVAL);
}
EXPORT_SYMBOL_GPL(ux500_regulator_get);
int ux500_regulator_atomic_enable(struct ux500_regulator *regulator)
{
if (regulator) {
regulator->enable();
return 0;
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(ux500_regulator_atomic_enable);
int ux500_regulator_atomic_disable(struct ux500_regulator *regulator)
{
if (regulator)
return regulator->disable();
else
return -EINVAL;
}
EXPORT_SYMBOL_GPL(ux500_regulator_atomic_disable);
void ux500_regulator_put(struct ux500_regulator *regulator)
{
/* Here for symetric reasons and for possible future use */
}
EXPORT_SYMBOL_GPL(ux500_regulator_put);
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