From 5f736c61d64cd5efb1c9cc4bc4d5f45e73f4f59c Mon Sep 17 00:00:00 2001
From: KangNam Park <kn0710.park@samsung.com>
Date: Wed, 30 Jul 2014 23:38:57 +0900
Subject: [PATCH] arch64: dma: add the dma interface for audio

Change-Id: I8037f12b582668ed6c7fb3031dca768685a909db
Signed-off-by: KangNam Park <kn0710.park@samsung.com>
Signed-off-by: Seokju Yoon <sukju.yoon@samsung.com>
---
 arch/arm64/include/asm/dma-mapping.h |  7 +++++++
 arch/arm64/mm/dma-mapping.c          | 30 ++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index 0df756b24863..5398d2dad0eb 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -20,11 +20,18 @@
 
 #include <linux/types.h>
 #include <linux/vmalloc.h>
+#include <linux/dma-debug.h>
 
 #include <xen/xen.h>
 #include <asm/xen/hypervisor.h>
 
+#define DMA_ERROR_CODE	(~(dma_addr_t)0)
+
 extern const struct dma_map_ops dummy_dma_ops;
+extern struct dma_map_ops *dma_ops;
+extern struct dma_map_ops coherent_swiotlb_dma_ops;
+extern struct dma_map_ops noncoherent_swiotlb_dma_ops;
+extern struct dma_map_ops arm_exynos_dma_mcode_ops;
 
 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 115b32639a3c..6d245950491a 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -386,6 +386,36 @@ static const struct dma_map_ops swiotlb_dma_ops = {
 	.mapping_error = __swiotlb_dma_mapping_error,
 };
 
+static void *arm_exynos_dma_mcode_alloc(struct device *dev, size_t size,
+	dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs);
+static void arm_exynos_dma_mcode_free(struct device *dev, size_t size, void *cpu_addr,
+				  dma_addr_t handle, struct dma_attrs *attrs);
+
+struct dma_map_ops arm_exynos_dma_mcode_ops = {
+	.alloc			= arm_exynos_dma_mcode_alloc,
+	.free			= arm_exynos_dma_mcode_free,
+};
+EXPORT_SYMBOL(arm_exynos_dma_mcode_ops);
+
+static void *arm_exynos_dma_mcode_alloc(struct device *dev, size_t size,
+	dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs)
+{
+	void *addr;
+
+	if (!*handle)
+		return NULL;
+
+	addr = ioremap(*handle, size);
+
+	return addr;
+}
+
+static void arm_exynos_dma_mcode_free(struct device *dev, size_t size, void *cpu_addr,
+				  dma_addr_t handle, struct dma_attrs *attrs)
+{
+	iounmap(cpu_addr);
+}
+
 static int __init atomic_pool_init(void)
 {
 	pgprot_t prot = __pgprot(PROT_NORMAL_NC);
-- 
2.20.1