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irqchip: exynos-combiner: Save IRQ enable set on suspend 

The Exynos interrupt combiner IP loses its state when the SoC enters
into a low power state during a Suspend-to-RAM. This means that if a
IRQ is used as a source, the interrupts for the devices are disabled
when the system is resumed from a sleep state so are not triggered.

Save the interrupt enable set register for each combiner group and
restore it after resume to make sure that the interrupts are enabled.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Tomasz Figa <tomasz.figa@gmail.com>
Cc: Doug Anderson <dianders@chromium.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Peter Chubb <peter.chubb@nicta.com.au>
Cc: Shuah Khan <shuahkhan@gmail.com>
Cc: Chanho Park <parkch98@gmail.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Link: http://lkml.kernel.org/r/1434087795-13990-1-git-send-email-javier.martinez@collabora.co.uk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Javier Martinez Canillas 2015-06-12 07:43:15 +02:00 committed by Thomas Gleixner
parent 55963c9f20
commit 6fd4899a54
1 changed files with 59 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
drivers/irqchip/exynos-combiner.c
View File

@ -13,6 +13,7 @@
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/syscore_ops.h>
#include <linux/irqdomain.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/interrupt.h>
@ -34,9 +35,14 @@ struct combiner_chip_data {
unsigned int irq_mask;
void __iomem *base;
unsigned int parent_irq;
#ifdef CONFIG_PM
u32 pm_save;
#endif
};
static struct combiner_chip_data *combiner_data;
static struct irq_domain *combiner_irq_domain;
static unsigned int max_nr = 20;
static inline void __iomem *combiner_base(struct irq_data *data)
{
@ -170,12 +176,10 @@ static const struct irq_domain_ops combiner_irq_domain_ops = {
};
static void __init combiner_init(void __iomem *combiner_base,
struct device_node *np,
unsigned int max_nr)
struct device_node *np)
{
int i, irq;
unsigned int nr_irq;
struct combiner_chip_data *combiner_data;
nr_irq = max_nr * IRQ_IN_COMBINER;
@ -201,11 +205,59 @@ static void __init combiner_init(void __iomem *combiner_base,
}
}
#ifdef CONFIG_PM
/**
* combiner_suspend - save interrupt combiner state before suspend
*
* Save the interrupt enable set register for all combiner groups since
* the state is lost when the system enters into a sleep state.
*
*/
static int combiner_suspend(void)
{
int i;
for (i = 0; i < max_nr; i++)
combiner_data[i].pm_save =
__raw_readl(combiner_data[i].base + COMBINER_ENABLE_SET);
return 0;
}
/**
* combiner_resume - restore interrupt combiner state after resume
*
* Restore the interrupt enable set register for all combiner groups since
* the state is lost when the system enters into a sleep state on suspend.
*
*/
static void combiner_resume(void)
{
int i;
for (i = 0; i < max_nr; i++) {
__raw_writel(combiner_data[i].irq_mask,
combiner_data[i].base + COMBINER_ENABLE_CLEAR);
__raw_writel(combiner_data[i].pm_save,
combiner_data[i].base + COMBINER_ENABLE_SET);
}
}
#else
#define combiner_suspend NULL
#define combiner_resume NULL
#endif
static struct syscore_ops combiner_syscore_ops = {
.suspend = combiner_suspend,
.resume = combiner_resume,
};
static int __init combiner_of_init(struct device_node *np,
struct device_node *parent)
{
void __iomem *combiner_base;
unsigned int max_nr = 20;
combiner_base = of_iomap(np, 0);
if (!combiner_base) {
@ -219,7 +271,9 @@ static int __init combiner_of_init(struct device_node *np,
__func__, max_nr);
}
combiner_init(combiner_base, np, max_nr);
combiner_init(combiner_base, np);
register_syscore_ops(&combiner_syscore_ops);
return 0;
}