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linux-next/arch/sh/kernel/dma-coherent.c
Christoph Hellwig 9f4df96b87 dma-mapping: merge <linux/dma-noncoherent.h> into <linux/dma-map-ops.h>
Move more nitty gritty DMA implementation details into the common
internal header.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-10-06 07:07:06 +02:00

34 lines
782 B
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2004 - 2007 Paul Mundt
*/
#include <linux/mm.h>
#include <linux/dma-map-ops.h>
#include <asm/cacheflush.h>
#include <asm/addrspace.h>
void arch_dma_prep_coherent(struct page *page, size_t size)
{
__flush_purge_region(page_address(page), size);
}
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
enum dma_data_direction dir)
{
void *addr = sh_cacheop_vaddr(phys_to_virt(paddr));
switch (dir) {
case DMA_FROM_DEVICE: /* invalidate only */
__flush_invalidate_region(addr, size);
break;
case DMA_TO_DEVICE: /* writeback only */
__flush_wback_region(addr, size);
break;
case DMA_BIDIRECTIONAL: /* writeback and invalidate */
__flush_purge_region(addr, size);
break;
default:
BUG();
}
}