linux/arch/xtensa/include/asm/dma-mapping.h
FUJITA Tomonori 3b9c6c11f5 dma-mapping: remove dma_is_consistent API
Architectures implement dma_is_consistent() in different ways (some
misinterpret the definition of API in DMA-API.txt).  So it hasn't been so
useful for drivers.  We have only one user of the API in tree.  Unlikely
out-of-tree drivers use the API.

Even if we fix dma_is_consistent() in some architectures, it doesn't look
useful at all.  It was invented long ago for some old systems that can't
allocate coherent memory at all.  It's better to export only APIs that are
definitely necessary for drivers.

Let's remove this API.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11 08:59:21 -07:00

172 lines
4.2 KiB
C

/*
* include/asm-xtensa/dma-mapping.h
*
* 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.
*
* Copyright (C) 2003 - 2005 Tensilica Inc.
*/
#ifndef _XTENSA_DMA_MAPPING_H
#define _XTENSA_DMA_MAPPING_H
#include <asm/cache.h>
#include <asm/io.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
/*
* DMA-consistent mapping functions.
*/
extern void *consistent_alloc(int, size_t, dma_addr_t, unsigned long);
extern void consistent_free(void*, size_t, dma_addr_t);
extern void consistent_sync(void*, size_t, int);
#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)
void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag);
void dma_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle);
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);
consistent_sync(ptr, size, direction);
return virt_to_phys(ptr);
}
static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
}
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(sg));
sg->dma_address = sg_phys(sg);
consistent_sync(sg_virt(sg), sg->length, direction);
}
return nents;
}
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);
return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset;
}
static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
}
static inline void
dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
}
static inline void
dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
enum dma_data_direction direction)
{
consistent_sync((void *)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)
{
consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
}
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)
{
consistent_sync((void *)bus_to_virt(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)
{
consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
}
static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction dir)
{
int i;
for (i = 0; i < nelems; i++, sg++)
consistent_sync(sg_virt(sg), sg->length, dir);
}
static inline void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction dir)
{
int i;
for (i = 0; i < nelems; i++, sg++)
consistent_sync(sg_virt(sg), sg->length, dir);
}
static inline int
dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return 0;
}
static inline int
dma_supported(struct device *dev, u64 mask)
{
return 1;
}
static inline int
dma_set_mask(struct device *dev, u64 mask)
{
if(!dev->dma_mask || !dma_supported(dev, mask))
return -EIO;
*dev->dma_mask = mask;
return 0;
}
static inline void
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction)
{
consistent_sync(vaddr, size, direction);
}
#endif /* _XTENSA_DMA_MAPPING_H */