238 lines
6.1 KiB
C
238 lines
6.1 KiB
C
/*
|
|
* This is based on both include/asm-sh/dma-mapping.h and
|
|
* include/asm-ppc/pci.h
|
|
*/
|
|
#ifndef __ASM_PPC_DMA_MAPPING_H
|
|
#define __ASM_PPC_DMA_MAPPING_H
|
|
|
|
#include <linux/config.h>
|
|
/* need struct page definitions */
|
|
#include <linux/mm.h>
|
|
#include <asm/scatterlist.h>
|
|
#include <asm/io.h>
|
|
|
|
#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
/*
|
|
* DMA-consistent mapping functions for PowerPCs that don't support
|
|
* cache snooping. These allocate/free a region of uncached mapped
|
|
* memory space for use with DMA devices. Alternatively, you could
|
|
* allocate the space "normally" and use the cache management functions
|
|
* to ensure it is consistent.
|
|
*/
|
|
extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, int gfp);
|
|
extern void __dma_free_coherent(size_t size, void *vaddr);
|
|
extern void __dma_sync(void *vaddr, size_t size, int direction);
|
|
extern void __dma_sync_page(struct page *page, unsigned long offset,
|
|
size_t size, int direction);
|
|
#define dma_cache_inv(_start,_size) \
|
|
invalidate_dcache_range(_start, (_start + _size))
|
|
#define dma_cache_wback(_start,_size) \
|
|
clean_dcache_range(_start, (_start + _size))
|
|
#define dma_cache_wback_inv(_start,_size) \
|
|
flush_dcache_range(_start, (_start + _size))
|
|
|
|
#else /* ! CONFIG_NOT_COHERENT_CACHE */
|
|
/*
|
|
* Cache coherent cores.
|
|
*/
|
|
|
|
#define dma_cache_inv(_start,_size) do { } while (0)
|
|
#define dma_cache_wback(_start,_size) do { } while (0)
|
|
#define dma_cache_wback_inv(_start,_size) do { } while (0)
|
|
|
|
#define __dma_alloc_coherent(gfp, size, handle) NULL
|
|
#define __dma_free_coherent(size, addr) do { } while (0)
|
|
#define __dma_sync(addr, size, rw) do { } while (0)
|
|
#define __dma_sync_page(pg, off, sz, rw) do { } while (0)
|
|
|
|
#endif /* ! CONFIG_NOT_COHERENT_CACHE */
|
|
|
|
#define dma_supported(dev, mask) (1)
|
|
|
|
static inline int dma_set_mask(struct device *dev, u64 dma_mask)
|
|
{
|
|
if (!dev->dma_mask || !dma_supported(dev, mask))
|
|
return -EIO;
|
|
|
|
*dev->dma_mask = dma_mask;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void *dma_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t * dma_handle,
|
|
gfp_t gfp)
|
|
{
|
|
#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
return __dma_alloc_coherent(size, dma_handle, gfp);
|
|
#else
|
|
void *ret;
|
|
/* ignore region specifiers */
|
|
gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
|
|
|
|
if (dev == NULL || dev->coherent_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_bus(ret);
|
|
}
|
|
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
static inline void
|
|
dma_free_coherent(struct device *dev, size_t size, void *vaddr,
|
|
dma_addr_t dma_handle)
|
|
{
|
|
#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
__dma_free_coherent(size, vaddr);
|
|
#else
|
|
free_pages((unsigned long)vaddr, get_order(size));
|
|
#endif
|
|
}
|
|
|
|
static inline dma_addr_t
|
|
dma_map_single(struct device *dev, void *ptr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
__dma_sync(ptr, size, direction);
|
|
|
|
return virt_to_bus(ptr);
|
|
}
|
|
|
|
/* We do nothing. */
|
|
#define dma_unmap_single(dev, addr, size, dir) do { } while (0)
|
|
|
|
static inline dma_addr_t
|
|
dma_map_page(struct device *dev, struct page *page,
|
|
unsigned long offset, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
__dma_sync_page(page, offset, size, direction);
|
|
|
|
return page_to_bus(page) + offset;
|
|
}
|
|
|
|
/* We do nothing. */
|
|
#define dma_unmap_page(dev, handle, size, dir) do { } while (0)
|
|
|
|
static inline int
|
|
dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
|
|
enum dma_data_direction direction)
|
|
{
|
|
int i;
|
|
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
for (i = 0; i < nents; i++, sg++) {
|
|
BUG_ON(!sg->page);
|
|
__dma_sync_page(sg->page, sg->offset, sg->length, direction);
|
|
sg->dma_address = page_to_bus(sg->page) + sg->offset;
|
|
}
|
|
|
|
return nents;
|
|
}
|
|
|
|
/* We don't do anything here. */
|
|
#define dma_unmap_sg(dev, sg, nents, dir) do { } while (0)
|
|
|
|
static inline void
|
|
dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
|
|
size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
__dma_sync(bus_to_virt(dma_handle), size, direction);
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
|
|
size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
__dma_sync(bus_to_virt(dma_handle), size, direction);
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
|
|
enum dma_data_direction direction)
|
|
{
|
|
int i;
|
|
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
for (i = 0; i < nents; i++, sg++)
|
|
__dma_sync_page(sg->page, sg->offset, sg->length, direction);
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
|
|
enum dma_data_direction direction)
|
|
{
|
|
int i;
|
|
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
for (i = 0; i < nents; i++, sg++)
|
|
__dma_sync_page(sg->page, sg->offset, sg->length, direction);
|
|
}
|
|
|
|
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
|
|
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
|
|
#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
#define dma_is_consistent(d) (0)
|
|
#else
|
|
#define dma_is_consistent(d) (1)
|
|
#endif
|
|
|
|
static inline int dma_get_cache_alignment(void)
|
|
{
|
|
/*
|
|
* Each processor family will define its own L1_CACHE_SHIFT,
|
|
* L1_CACHE_BYTES wraps to this, so this is always safe.
|
|
*/
|
|
return L1_CACHE_BYTES;
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
|
|
unsigned long offset, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
/* just sync everything for now */
|
|
dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
|
|
}
|
|
|
|
static inline void
|
|
dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
|
|
unsigned long offset, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
/* just sync everything for now */
|
|
dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
|
|
}
|
|
|
|
static inline void dma_cache_sync(void *vaddr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
__dma_sync(vaddr, size, (int)direction);
|
|
}
|
|
|
|
static inline int dma_mapping_error(dma_addr_t dma_addr)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* __ASM_PPC_DMA_MAPPING_H */
|