84 lines
2 KiB
C
84 lines
2 KiB
C
/*
|
|
* Copyright (C) 2004 - 2007 Paul Mundt
|
|
*
|
|
* 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/mm.h>
|
|
#include <linux/init.h>
|
|
#include <linux/dma-noncoherent.h>
|
|
#include <linux/module.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/addrspace.h>
|
|
|
|
void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
|
|
gfp_t gfp, unsigned long attrs)
|
|
{
|
|
void *ret, *ret_nocache;
|
|
int order = get_order(size);
|
|
|
|
gfp |= __GFP_ZERO;
|
|
|
|
ret = (void *)__get_free_pages(gfp, order);
|
|
if (!ret)
|
|
return NULL;
|
|
|
|
/*
|
|
* Pages from the page allocator may have data present in
|
|
* cache. So flush the cache before using uncached memory.
|
|
*/
|
|
arch_sync_dma_for_device(dev, virt_to_phys(ret), size,
|
|
DMA_BIDIRECTIONAL);
|
|
|
|
ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size);
|
|
if (!ret_nocache) {
|
|
free_pages((unsigned long)ret, order);
|
|
return NULL;
|
|
}
|
|
|
|
split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
|
|
|
|
*dma_handle = virt_to_phys(ret);
|
|
if (!WARN_ON(!dev))
|
|
*dma_handle -= PFN_PHYS(dev->dma_pfn_offset);
|
|
|
|
return ret_nocache;
|
|
}
|
|
|
|
void arch_dma_free(struct device *dev, size_t size, void *vaddr,
|
|
dma_addr_t dma_handle, unsigned long attrs)
|
|
{
|
|
int order = get_order(size);
|
|
unsigned long pfn = (dma_handle >> PAGE_SHIFT);
|
|
int k;
|
|
|
|
if (!WARN_ON(!dev))
|
|
pfn += dev->dma_pfn_offset;
|
|
|
|
for (k = 0; k < (1 << order); k++)
|
|
__free_pages(pfn_to_page(pfn + k), 0);
|
|
|
|
iounmap(vaddr);
|
|
}
|
|
|
|
void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
void *addr = sh_cacheop_vaddr(phys_to_virt(paddr));
|
|
|
|
switch (dir) {
|
|
case DMA_FROM_DEVICE: /* invalidate only */
|
|
__flush_invalidate_region(addr, size);
|
|
break;
|
|
case DMA_TO_DEVICE: /* writeback only */
|
|
__flush_wback_region(addr, size);
|
|
break;
|
|
case DMA_BIDIRECTIONAL: /* writeback and invalidate */
|
|
__flush_purge_region(addr, size);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|