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authorAnup Patel <Anup.Patel@wdc.com>2019-02-25 08:14:17 +0000
committerAndes <uboot@andestech.com>2019-02-27 09:12:33 +0800
commit70b8562dcf03461cd01bcacab7520c7d1485176c (patch)
tree23409e24b386153100d54af5c92a1653ff431c02 /arch
parentfdff1f96a6505bccb258f5b52e6c94c7e0b29512 (diff)
riscv: Add asm/dma-mapping.h for DMA mappings
This patch adds asm/dma-mapping.h for Linux-like DMA mappings APIs required by some of the drivers (such as, Cadance MACB Ethernet driver). Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Alexander Graf <agraf@suse.de> Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/riscv/include/asm/dma-mapping.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/dma-mapping.h b/arch/riscv/include/asm/dma-mapping.h
new file mode 100644
index 0000000000..3d930c90ec
--- /dev/null
+++ b/arch/riscv/include/asm/dma-mapping.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2018 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ * Anup Patel <anup.patel@wdc.com>
+ */
+
+#ifndef __ASM_RISCV_DMA_MAPPING_H
+#define __ASM_RISCV_DMA_MAPPING_H
+
+#include <linux/dma-direction.h>
+
+#define dma_mapping_error(x, y) 0
+
+static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
+{
+ *handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len);
+ return (void *)*handle;
+}
+
+static inline void dma_free_coherent(void *addr)
+{
+ free(addr);
+}
+
+static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
+ enum dma_data_direction dir)
+{
+ return (unsigned long)vaddr;
+}
+
+static inline void dma_unmap_single(volatile void *vaddr, size_t len,
+ unsigned long paddr)
+{
+}
+
+#endif /* __ASM_RISCV_DMA_MAPPING_H */