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irqchip/stm32: Add suspend/resume support for hierarchy domain 

This patch adds suspend/resume feature for exti hierarchy domain.
-suspend function sets wake_active into imr of each banks
-resume function restores the mask_cache interrupt into
 imr of each banks

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
hifive-unleashed-5.1
Ludovic Barre 2018-04-26 18:18:31 +02:00 committed by Marc Zyngier
parent 927abfc446
commit 73958b31c1
1 changed files with 49 additions and 0 deletions
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49
drivers/irqchip/irq-stm32-exti.c
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@ -14,6 +14,7 @@
#include <linux/irqdomain.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/syscore_ops.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
@ -59,6 +60,8 @@ struct stm32_exti_host_data {
const struct stm32_exti_drv_data *drv_data;
};
static struct stm32_exti_host_data *stm32_host_data;
static const struct stm32_exti_bank stm32f4xx_exti_b1 = {
.imr_ofst = 0x00,
.emr_ofst = 0x04,
@ -498,6 +501,48 @@ static int stm32_exti_h_set_affinity(struct irq_data *d,
return -EINVAL;
}
#ifdef CONFIG_PM
static int stm32_exti_h_suspend(void)
{
struct stm32_exti_chip_data *chip_data;
int i;
for (i = 0; i < stm32_host_data->drv_data->bank_nr; i++) {
chip_data = &stm32_host_data->chips_data[i];
raw_spin_lock(&chip_data->rlock);
stm32_chip_suspend(chip_data, chip_data->wake_active);
raw_spin_unlock(&chip_data->rlock);
}
return 0;
}
static void stm32_exti_h_resume(void)
{
struct stm32_exti_chip_data *chip_data;
int i;
for (i = 0; i < stm32_host_data->drv_data->bank_nr; i++) {
chip_data = &stm32_host_data->chips_data[i];
raw_spin_lock(&chip_data->rlock);
stm32_chip_resume(chip_data, chip_data->mask_cache);
raw_spin_unlock(&chip_data->rlock);
}
}
static struct syscore_ops stm32_exti_h_syscore_ops = {
.suspend = stm32_exti_h_suspend,
.resume = stm32_exti_h_resume,
};
static void stm32_exti_h_syscore_init(void)
{
register_syscore_ops(&stm32_exti_h_syscore_ops);
}
#else
static inline void stm32_exti_h_syscore_init(void) {}
#endif
static struct irq_chip stm32_exti_h_chip = {
.name = "stm32-exti-h",
.irq_eoi = stm32_exti_h_eoi,
@ -567,6 +612,8 @@ stm32_exti_host_data *stm32_exti_host_init(const struct stm32_exti_drv_data *dd,
return NULL;
}
stm32_host_data = host_data;
return host_data;
}
@ -725,6 +772,8 @@ __init stm32_exti_hierarchy_init(const struct stm32_exti_drv_data *drv_data,
goto out_unmap;
}
stm32_exti_h_syscore_init();
return 0;
out_unmap: