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7e812f2e9c
This function return cache-line aligned allocation which is mapped to uncached io region. Signed-off-by: Thomas Chou <thomas@wytron.com.tw> Signed-off-by: Scott McNutt <smcnutt@psyent.com>
24 lines
734 B
C
24 lines
734 B
C
#ifndef __ASM_NIOS2_DMA_MAPPING_H
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#define __ASM_NIOS2_DMA_MAPPING_H
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/* dma_alloc_coherent() return cache-line aligned allocation which is mapped
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* to uncached io region.
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*
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* IO_REGION_BASE should be defined in board config header file
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* 0x80000000 for nommu, 0xe0000000 for mmu
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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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void *addr = malloc(len + CONFIG_SYS_DCACHELINE_SIZE);
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if (!addr)
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return 0;
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flush_dcache((unsigned long)addr, len + CONFIG_SYS_DCACHELINE_SIZE);
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*handle = ((unsigned long)addr +
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(CONFIG_SYS_DCACHELINE_SIZE - 1)) &
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~(CONFIG_SYS_DCACHELINE_SIZE - 1) & ~(IO_REGION_BASE);
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return (void *)(*handle | IO_REGION_BASE);
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}
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#endif /* __ASM_NIOS2_DMA_MAPPING_H */
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