This patch introduces IOMMU_OF_DECLARE-based initialization to the driver, which replaces subsys_initcall-based procedure. exynos_iommu_of_setup ensures that each sysmmu controller is probed before its master device.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com --- drivers/iommu/exynos-iommu.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index c53cc8f..ff169ce 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -13,16 +13,21 @@ #endif
#include <linux/clk.h> +#include <linux/dma-mapping.h> #include <linux/err.h> #include <linux/io.h> #include <linux/iommu.h> #include <linux/interrupt.h> #include <linux/list.h> +#include <linux/of.h> +#include <linux/of_iommu.h> +#include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/slab.h>
#include <asm/cacheflush.h> +#include <asm/dma-iommu.h> #include <asm/pgtable.h>
typedef u32 sysmmu_iova_t; @@ -1072,7 +1077,7 @@ static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *iommu_domain, return phys; }
-static const struct iommu_ops exynos_iommu_ops = { +static struct iommu_ops exynos_iommu_ops = { .domain_init = exynos_iommu_domain_init, .domain_destroy = exynos_iommu_domain_destroy, .attach_dev = exynos_iommu_attach_device, @@ -1084,6 +1089,8 @@ static const struct iommu_ops exynos_iommu_ops = { .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE, };
+static int init_done; + static int __init exynos_iommu_init(void) { int ret; @@ -1116,6 +1123,8 @@ static int __init exynos_iommu_init(void) goto err_set_iommu; }
+ init_done = true; + return 0; err_set_iommu: kmem_cache_free(lv2table_kmem_cache, zero_lv2_table); @@ -1125,4 +1134,21 @@ err_reg_driver: kmem_cache_destroy(lv2table_kmem_cache); return ret; } -subsys_initcall(exynos_iommu_init); + +static int __init exynos_iommu_of_setup(struct device_node *np) +{ + struct platform_device *pdev; + + if (!init_done) + exynos_iommu_init(); + + pdev = of_platform_device_create(np, NULL, platform_bus_type.dev_root); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + of_iommu_set_ops(np, &exynos_iommu_ops); + return 0; +} + +IOMMU_OF_DECLARE(exynos_iommu_of, "samsung,exynos-sysmmu", + exynos_iommu_of_setup);