mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-22 02:24:57 +08:00
9f4df96b87
Move more nitty gritty DMA implementation details into the common internal header. Signed-off-by: Christoph Hellwig <hch@lst.de>
44 lines
972 B
C
44 lines
972 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2009-2010 PetaLogix
|
|
* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
|
|
*
|
|
* Provide default implementations of the DMA mapping callbacks for
|
|
* directly mapped busses.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/dma-map-ops.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/export.h>
|
|
#include <linux/bug.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
static void __dma_sync(phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
switch (direction) {
|
|
case DMA_TO_DEVICE:
|
|
case DMA_BIDIRECTIONAL:
|
|
flush_dcache_range(paddr, paddr + size);
|
|
break;
|
|
case DMA_FROM_DEVICE:
|
|
invalidate_dcache_range(paddr, paddr + size);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
__dma_sync(paddr, size, dir);
|
|
}
|
|
|
|
void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
__dma_sync(paddr, size, dir);
|
|
}
|