126 строки
2.8 KiB
C
126 строки
2.8 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_alloc(struct device *dev, size_t size, dma_addr_t *handle,
|
|
gfp_t flag, unsigned long attrs)
|
|
{
|
|
struct page *page, **map;
|
|
pgprot_t pgprot;
|
|
void *addr;
|
|
int i, order;
|
|
|
|
pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
|
|
|
|
size = PAGE_ALIGN(size);
|
|
order = get_order(size);
|
|
|
|
page = alloc_pages(flag, order);
|
|
if (!page)
|
|
return NULL;
|
|
|
|
*handle = page_to_phys(page);
|
|
map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
|
|
if (!map) {
|
|
__free_pages(page, order);
|
|
return NULL;
|
|
}
|
|
split_page(page, order);
|
|
|
|
order = 1 << order;
|
|
size >>= PAGE_SHIFT;
|
|
map[0] = page;
|
|
for (i = 1; i < size; i++)
|
|
map[i] = page + i;
|
|
for (; i < order; i++)
|
|
__free_page(page + i);
|
|
pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
|
|
if (CPU_IS_040_OR_060)
|
|
pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
|
|
else
|
|
pgprot_val(pgprot) |= _PAGE_NOCACHE030;
|
|
addr = vmap(map, size, VM_MAP, pgprot);
|
|
kfree(map);
|
|
|
|
return addr;
|
|
}
|
|
|
|
void arch_dma_free(struct device *dev, size_t size, void *addr,
|
|
dma_addr_t handle, unsigned long attrs)
|
|
{
|
|
pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
|
|
vfree(addr);
|
|
}
|
|
|
|
#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(struct device *dev, 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;
|
|
}
|
|
}
|
|
|
|
void arch_setup_pdev_archdata(struct platform_device *pdev)
|
|
{
|
|
if (pdev->dev.coherent_dma_mask == DMA_MASK_NONE &&
|
|
pdev->dev.dma_mask == NULL) {
|
|
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
|
|
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
|
|
}
|
|
}
|