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/*
* 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-mapping.h>
#include <linux/device.h>
#include <linux/kernel.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)
static void *m68k_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;
}
static void m68k_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>
static void *m68k_dma_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long 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 m68k_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 */
static void m68k_dma_sync_single_for_device(struct device *dev,
dma_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;
}
}
static void m68k_dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sglist, int nents, enum dma_data_direction dir)
{
int i;
struct scatterlist *sg;
for_each_sg(sglist, sg, nents, i) {
dma_sync_single_for_device(dev, sg->dma_address, sg->length,
dir);
}
}
static dma_addr_t m68k_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
dma_addr_t handle = page_to_phys(page) + offset;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
dma_sync_single_for_device(dev, handle, size, dir);
return handle;
}
static int m68k_dma_map_sg(struct device *dev, struct scatterlist *sglist,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
int i;
struct scatterlist *sg;
for_each_sg(sglist, sg, nents, i) {
sg->dma_address = sg_phys(sg);
if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
continue;
dma_sync_single_for_device(dev, sg->dma_address, sg->length,
dir);
}
return nents;
}
const struct dma_map_ops m68k_dma_ops = {
.alloc = m68k_dma_alloc,
.free = m68k_dma_free,
.map_page = m68k_dma_map_page,
.map_sg = m68k_dma_map_sg,
.sync_single_for_device = m68k_dma_sync_single_for_device,
.sync_sg_for_device = m68k_dma_sync_sg_for_device,
};
EXPORT_SYMBOL(m68k_dma_ops);
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