diff options
Diffstat (limited to 'drivers/iommu/omap-iommu.c')
-rw-r--r-- | drivers/iommu/omap-iommu.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index ef62ac9057bb..ecf14001beed 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -939,6 +939,64 @@ static void omap_iommu_restore_tlb_entries(struct omap_iommu *obj) } /** + * omap_iommu_domain_deactivate - deactivate attached iommu devices + * @domain: iommu domain attached to the target iommu device + * + * This API allows the client devices of IOMMU devices to suspend + * the IOMMUs they control at runtime, after they are idled and + * suspended all activity. System Suspend will leverage the PM + * driver late callbacks. + **/ +int omap_iommu_domain_deactivate(struct iommu_domain *domain) +{ + struct omap_iommu_domain *omap_domain = to_omap_domain(domain); + struct omap_iommu_device *iommu; + struct omap_iommu *oiommu; + int i; + + if (!omap_domain->dev) + return 0; + + iommu = omap_domain->iommus; + iommu += (omap_domain->num_iommus - 1); + for (i = 0; i < omap_domain->num_iommus; i++, iommu--) { + oiommu = iommu->iommu_dev; + pm_runtime_put_sync(oiommu->dev); + } + + return 0; +} +EXPORT_SYMBOL_GPL(omap_iommu_domain_deactivate); + +/** + * omap_iommu_domain_activate - activate attached iommu devices + * @domain: iommu domain attached to the target iommu device + * + * This API allows the client devices of IOMMU devices to resume the + * IOMMUs they control at runtime, before they can resume operations. + * System Resume will leverage the PM driver late callbacks. + **/ +int omap_iommu_domain_activate(struct iommu_domain *domain) +{ + struct omap_iommu_domain *omap_domain = to_omap_domain(domain); + struct omap_iommu_device *iommu; + struct omap_iommu *oiommu; + int i; + + if (!omap_domain->dev) + return 0; + + iommu = omap_domain->iommus; + for (i = 0; i < omap_domain->num_iommus; i++, iommu++) { + oiommu = iommu->iommu_dev; + pm_runtime_get_sync(oiommu->dev); + } + + return 0; +} +EXPORT_SYMBOL_GPL(omap_iommu_domain_activate); + +/** * omap_iommu_runtime_suspend - disable an iommu device * @dev: iommu device * |