[U-Boot] [PATCH 1/3] riscv: Add asm/dma-mapping.h for DMA mappings
Anup Patel
anup at brainfault.org
Mon Dec 17 11:51:41 UTC 2018
From: Anup Patel <anup.patel at wdc.com>
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 at wdc.com>
---
arch/riscv/include/asm/dma-mapping.h | 37 ++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
create mode 100644 arch/riscv/include/asm/dma-mapping.h
diff --git a/arch/riscv/include/asm/dma-mapping.h b/arch/riscv/include/asm/dma-mapping.h
new file mode 100644
index 0000000000..9782b6f168
--- /dev/null
+++ b/arch/riscv/include/asm/dma-mapping.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2018 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ * Anup Patel <anup.patel at 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 */
--
2.17.1
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