mirror of https://gitee.com/openkylin/linux.git
92 lines
2.2 KiB
C
92 lines
2.2 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(struct device *dev, 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(struct device *dev, 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_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
|
|
gfp_t gfp, unsigned long attrs)
|
|
{
|
|
void *ret;
|
|
|
|
/* optimized page clearing */
|
|
gfp |= __GFP_ZERO;
|
|
|
|
if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
|
|
gfp |= GFP_DMA;
|
|
|
|
ret = (void *) __get_free_pages(gfp, get_order(size));
|
|
if (ret != NULL) {
|
|
*dma_handle = virt_to_phys(ret);
|
|
flush_dcache_range((unsigned long) ret,
|
|
(unsigned long) ret + size);
|
|
ret = UNCAC_ADDR(ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void arch_dma_free(struct device *dev, size_t size, void *vaddr,
|
|
dma_addr_t dma_handle, unsigned long attrs)
|
|
{
|
|
unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);
|
|
|
|
free_pages(addr, get_order(size));
|
|
}
|