70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
|
|
* 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/dma-mapping.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/module.h>
|
|
#include <asm/pgalloc.h>
|
|
|
|
static void *dma_alloc(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t gfp,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
void *ret;
|
|
|
|
/* ignore region specifiers */
|
|
gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
|
|
|
|
if (dev == NULL || (*dev->dma_mask < 0xffffffff))
|
|
gfp |= GFP_DMA;
|
|
ret = (void *)__get_free_pages(gfp, get_order(size));
|
|
|
|
if (ret != NULL) {
|
|
memset(ret, 0, size);
|
|
*dma_handle = virt_to_phys(ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void dma_free(struct device *dev, size_t size,
|
|
void *vaddr, dma_addr_t dma_handle,
|
|
struct dma_attrs *attrs)
|
|
|
|
{
|
|
free_pages((unsigned long)vaddr, get_order(size));
|
|
}
|
|
|
|
static dma_addr_t map_page(struct device *dev, struct page *page,
|
|
unsigned long offset, size_t size,
|
|
enum dma_data_direction direction,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
return page_to_phys(page) + offset;
|
|
}
|
|
|
|
static int map_sg(struct device *dev, struct scatterlist *sgl,
|
|
int nents, enum dma_data_direction direction,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
for_each_sg(sgl, sg, nents, i) {
|
|
sg->dma_address = sg_phys(sg);
|
|
}
|
|
|
|
return nents;
|
|
}
|
|
|
|
struct dma_map_ops h8300_dma_map_ops = {
|
|
.alloc = dma_alloc,
|
|
.free = dma_free,
|
|
.map_page = map_page,
|
|
.map_sg = map_sg,
|
|
};
|
|
EXPORT_SYMBOL(h8300_dma_map_ops);
|