mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-25 05:04:09 +08:00
fa7e2247c5
Rename the symbol to arch_dma_set_uncached, and pass a size to it as well as allow an error return. That will allow reusing this hook for in-place pagetable remapping. As the in-place remap doesn't always require an explicit cache flush, also detangle ARCH_HAS_DMA_PREP_COHERENT from ARCH_HAS_DMA_SET_UNCACHED. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Robin Murphy <robin.murphy@arm.com>
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/*
|
|
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
|
|
* Copyright (C) 2009 Wind River Systems Inc
|
|
* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
|
|
*
|
|
* Based on DMA code from MIPS.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/string.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/io.h>
|
|
#include <linux/cache.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
void *vaddr = phys_to_virt(paddr);
|
|
|
|
switch (dir) {
|
|
case DMA_FROM_DEVICE:
|
|
invalidate_dcache_range((unsigned long)vaddr,
|
|
(unsigned long)(vaddr + size));
|
|
break;
|
|
case DMA_TO_DEVICE:
|
|
/*
|
|
* We just need to flush the caches here , but Nios2 flush
|
|
* instruction will do both writeback and invalidate.
|
|
*/
|
|
case DMA_BIDIRECTIONAL: /* flush and invalidate */
|
|
flush_dcache_range((unsigned long)vaddr,
|
|
(unsigned long)(vaddr + size));
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
void *vaddr = phys_to_virt(paddr);
|
|
|
|
switch (dir) {
|
|
case DMA_BIDIRECTIONAL:
|
|
case DMA_FROM_DEVICE:
|
|
invalidate_dcache_range((unsigned long)vaddr,
|
|
(unsigned long)(vaddr + size));
|
|
break;
|
|
case DMA_TO_DEVICE:
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
void arch_dma_prep_coherent(struct page *page, size_t size)
|
|
{
|
|
unsigned long start = (unsigned long)page_address(page);
|
|
|
|
flush_dcache_range(start, start + size);
|
|
}
|
|
|
|
void *arch_dma_set_uncached(void *ptr, size_t size)
|
|
{
|
|
unsigned long addr = (unsigned long)ptr;
|
|
|
|
addr |= CONFIG_NIOS2_IO_REGION_BASE;
|
|
|
|
return (void *)ptr;
|
|
}
|