56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/*
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* Copyright (C) 2006 Atmel Corporation
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __ASM_AVR32_DMA_MAPPING_H
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#define __ASM_AVR32_DMA_MAPPING_H
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#include <asm/io.h>
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#include <asm/arch/cacheflush.h>
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enum dma_data_direction {
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DMA_BIDIRECTIONAL = 0,
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DMA_TO_DEVICE = 1,
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DMA_FROM_DEVICE = 2,
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};
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static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
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{
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*handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len);
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return (void *)*handle;
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}
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static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
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enum dma_data_direction dir)
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{
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extern void __bad_dma_data_direction(void);
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switch (dir) {
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case DMA_BIDIRECTIONAL:
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flush_dcache_range((unsigned long)vaddr,
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(unsigned long)vaddr + len);
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break;
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case DMA_TO_DEVICE:
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dcache_clean_range(vaddr, len);
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break;
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case DMA_FROM_DEVICE:
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invalidate_dcache_range((unsigned long)vaddr,
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(unsigned long)vaddr + len);
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break;
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default:
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/* This will cause a linker error */
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__bad_dma_data_direction();
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}
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return virt_to_phys(vaddr);
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}
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static inline void dma_unmap_single(volatile void *vaddr, size_t len,
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unsigned long paddr)
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{
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}
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#endif /* __ASM_AVR32_DMA_MAPPING_H */
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