[PATCH v2 17/18] iommu: exynos: init from dt-specific callback instead of initcall

[Marek Szyprowski]

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.szyprow...@samsung.com>
---
 drivers/iommu/exynos-iommu.c | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 5eb999d7653a..0d304c62956e 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;
@@ -1083,6 +1088,8 @@ 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;
@@ -1115,6 +1122,8 @@ 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);
@@ -1124,4 +1133,25 @@ err_reg_driver:
        kmem_cache_destroy(lv2table_kmem_cache);
        return ret;
 }
-subsys_initcall(exynos_iommu_init);
+
+static struct iommu_data exynos_of_data = {
+       .ops = &exynos_iommu_ops,
+};
+
+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_data(np, &exynos_of_data);
+       return 0;
+}
+
+IOMMU_OF_DECLARE(exynos_iommu_of, "samsung,exynos-sysmmu",
+                exynos_iommu_of_setup);
-- 
1.9.2

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