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microblaze: Implement __dma_sync_page

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There is necessary to do some cache handling for dma operations.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2010-01-20 14:36:24 +01:00
parent ccfe27d700
commit 2549edd353
2 changed files with 23 additions and 4 deletions
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1
arch/microblaze/include/asm/dma-mapping.h
View file

@ -34,7 +34,6 @@
#define __dma_alloc_coherent(dev, gfp, size, handle) NULL
#define __dma_free_coherent(size, addr) ((void)0)
#define __dma_sync(addr, size, rw) ((void)0)
#define __dma_sync_page(pg, off, sz, rw) ((void)0)
static inline unsigned long device_to_mask(struct device *dev)
{

26
arch/microblaze/kernel/dma.c
View file

@ -10,6 +10,7 @@
#include <linux/dma-mapping.h>
#include <linux/dma-debug.h>
#include <asm/bug.h>
#include <asm/cacheflush.h>
/*
* Generic direct DMA implementation
@ -20,6 +21,23 @@
* default the offset is PCI_DRAM_OFFSET.
*/
static inline void __dma_sync_page(void *vaddr, unsigned long offset,
size_t size, enum dma_data_direction direction)
{
unsigned long start = virt_to_phys(vaddr);
switch (direction) {
case DMA_TO_DEVICE:
flush_dcache_range(start + offset, start + offset + size);
break;
case DMA_FROM_DEVICE:
invalidate_dcache_range(start + offset, start + offset + size);
break;
default:
BUG();
}
}
static unsigned long get_dma_direct_offset(struct device *dev)
{
if (dev)
@ -85,11 +103,11 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev,
struct page *page,
unsigned long offset,
size_t size,
enum dma_data_direction dir,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
BUG_ON(dir == DMA_NONE);
__dma_sync_page(page, offset, size, dir);
BUG_ON(direction == DMA_NONE);
__dma_sync_page(page, offset, size, direction);
return page_to_phys(page) + offset + get_dma_direct_offset(dev);
}
@ -99,6 +117,8 @@ static inline void dma_direct_unmap_page(struct device *dev,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
/* There is not necessary to do cache cleanup */
/* __dma_sync_page(dma_address, 0 , size, direction); */
}
struct dma_map_ops dma_direct_ops = {