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iommu/exynos: Add system suspend/resume support 

When system goes into suspend state, iommu should save it's state and
restore after system resume. This is handled by 'late' pm ops to ensure
that sysmmu will be suspended after its master devices and restored
before them.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Marek Szyprowski 2015-05-19 15:20:35 +02:00 committed by Joerg Roedel
parent ce70ca562b
commit 622015e407
1 changed files with 31 additions and 0 deletions
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31
drivers/iommu/exynos-iommu.c
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@ -601,6 +601,36 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int exynos_sysmmu_suspend(struct device *dev)
{
struct sysmmu_drvdata *data = dev_get_drvdata(dev);
dev_dbg(dev, "suspend\n");
if (is_sysmmu_active(data)) {
__sysmmu_disable_nocount(data);
pm_runtime_put(dev);
}
return 0;
}
static int exynos_sysmmu_resume(struct device *dev)
{
struct sysmmu_drvdata *data = dev_get_drvdata(dev);
dev_dbg(dev, "resume\n");
if (is_sysmmu_active(data)) {
pm_runtime_get_sync(dev);
__sysmmu_enable_nocount(data);
}
return 0;
}
#endif
static const struct dev_pm_ops sysmmu_pm_ops = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume)
};
static const struct of_device_id sysmmu_of_match[] __initconst = {
{ .compatible = "samsung,exynos-sysmmu", },
{ },
@ -611,6 +641,7 @@ static struct platform_driver exynos_sysmmu_driver __refdata = {
.driver = {
.name = "exynos-sysmmu",
.of_match_table = sysmmu_of_match,
.pm = &sysmmu_pm_ops,
}
};