81 lines
1.8 KiB
C
81 lines
1.8 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.
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/dma-noncoherent.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/export.h>
|
|
|
|
#include <asm/pgalloc.h>
|
|
|
|
#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
|
|
void arch_dma_prep_coherent(struct page *page, size_t size)
|
|
{
|
|
cache_push(page_to_phys(page), size);
|
|
}
|
|
|
|
pgprot_t pgprot_dmacoherent(pgprot_t prot)
|
|
{
|
|
if (CPU_IS_040_OR_060) {
|
|
pgprot_val(prot) &= ~_PAGE_CACHE040;
|
|
pgprot_val(prot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
|
|
} else {
|
|
pgprot_val(prot) |= _PAGE_NOCACHE030;
|
|
}
|
|
return prot;
|
|
}
|
|
#else
|
|
|
|
#include <asm/cacheflush.h>
|
|
|
|
void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
|
|
gfp_t gfp, unsigned long attrs)
|
|
{
|
|
void *ret;
|
|
|
|
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;
|
|
}
|
|
|
|
void arch_dma_free(struct device *dev, size_t size, void *vaddr,
|
|
dma_addr_t dma_handle, unsigned long attrs)
|
|
{
|
|
free_pages((unsigned long)vaddr, get_order(size));
|
|
}
|
|
|
|
#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
|
|
|
|
void arch_sync_dma_for_device(phys_addr_t handle, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
switch (dir) {
|
|
case DMA_BIDIRECTIONAL:
|
|
case DMA_TO_DEVICE:
|
|
cache_push(handle, size);
|
|
break;
|
|
case DMA_FROM_DEVICE:
|
|
cache_clear(handle, size);
|
|
break;
|
|
default:
|
|
pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n",
|
|
dir);
|
|
break;
|
|
}
|
|
}
|