This patch adds support for ARM 64bit architecture with IOMMU-DMA glue
code, so Exynos DRM can be now used on Exynos 5433 with IOMMU enabled.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/gpu/drm/exynos/Kconfig | 2 +-
drivers/gpu/drm/exynos/exynos_drm_drv.c | 7 +---
drivers/gpu/drm/exynos/exynos_drm_iommu.h | 55 +++++++++++++++++++++++++++++++
3 files changed, 57 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
index d814b3048ee5..343813a5fbc8 100644
--- a/drivers/gpu/drm/exynos/Kconfig
+++ b/drivers/gpu/drm/exynos/Kconfig
@@ -15,7 +15,7 @@ if DRM_EXYNOS
config DRM_EXYNOS_IOMMU
bool
- depends on EXYNOS_IOMMU && ARM_DMA_USE_IOMMU
+ depends on EXYNOS_IOMMU
default y
comment "CRTCs"
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 2dd820e23b0c..062fa9fea0f2 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -159,12 +159,7 @@ static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n",
dev_name(private->dma_dev));
- /*
- * create mapping to manage iommu table and set a pointer to iommu
- * mapping structure to iommu_mapping of private data.
- * also this iommu_mapping can be used to check if iommu is supported
- * or not.
- */
+ /* create common IOMMU mapping for all devices attached to Exynos DRM */
ret = drm_create_iommu_mapping(dev);
if (ret < 0) {
DRM_ERROR("failed to create iommu mapping.\n");
diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.h b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
index 22e1df2ac62e..c8de4913fdbe 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
@@ -49,6 +49,61 @@ static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
arm_iommu_detach_device(dev);
}
+#elif defined(CONFIG_IOMMU_DMA)
+#include <linux/dma-iommu.h>
+
+static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv,
+ unsigned long start, unsigned long size)
+{
+ struct iommu_domain *domain;
+ int ret;
+
+ domain = iommu_domain_alloc(priv->dma_dev->bus);
+ if (!domain)
+ return -ENOMEM;
+
+ ret = iommu_get_dma_cookie(domain);
+ if (ret)
+ goto free_domain;
+
+ ret = iommu_dma_init_domain(domain, start, size);
+ if (ret)
+ goto put_cookie;
+
+ priv->mapping = domain;
+ return 0;
+
+put_cookie:
+ iommu_put_dma_cookie(domain);
+free_domain:
+ iommu_domain_free(domain);
+ return ret;
+}
+
+static inline void __exynos_iommu_release_mapping(struct exynos_drm_private *priv)
+{
+ struct iommu_domain *domain = priv->mapping;
+
+ iommu_put_dma_cookie(domain);
+ iommu_domain_free(domain);
+ priv->mapping = NULL;
+}
+
+static inline int __exynos_iommu_attach(struct exynos_drm_private *priv,
+ struct device *dev)
+{
+ struct iommu_domain *domain = priv->mapping;
+
+ return iommu_attach_device(domain, dev);
+}
+
+static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
+ struct device *dev)
+{
+ struct iommu_domain *domain = priv->mapping;
+
+ iommu_detach_device(domain, dev);
+}
#else
#error Unsupported architecture and IOMMU/DMA-mapping glue code
#endif
--
1.9.1
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