linux/include/asm-generic/dma-mapping.h
Al Viro dd0fc66fb3 [PATCH] gfp flags annotations - part 1
- added typedef unsigned int __nocast gfp_t;

 - replaced __nocast uses for gfp flags with gfp_t - it gives exactly
   the same warnings as far as sparse is concerned, doesn't change
   generated code (from gcc point of view we replaced unsigned int with
   typedef) and documents what's going on far better.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-08 15:00:57 -07:00

310 lines
7.1 KiB
C

/* Copyright (C) 2002 by James.Bottomley@HansenPartnership.com
*
* Implements the generic device dma API via the existing pci_ one
* for unconverted architectures
*/
#ifndef _ASM_GENERIC_DMA_MAPPING_H
#define _ASM_GENERIC_DMA_MAPPING_H
#include <linux/config.h>
#ifdef CONFIG_PCI
/* we implement the API below in terms of the existing PCI one,
* so include it */
#include <linux/pci.h>
/* need struct page definitions */
#include <linux/mm.h>
static inline int
dma_supported(struct device *dev, u64 mask)
{
BUG_ON(dev->bus != &pci_bus_type);
return pci_dma_supported(to_pci_dev(dev), mask);
}
static inline int
dma_set_mask(struct device *dev, u64 dma_mask)
{
BUG_ON(dev->bus != &pci_bus_type);
return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
}
static inline void *
dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t flag)
{
BUG_ON(dev->bus != &pci_bus_type);
return pci_alloc_consistent(to_pci_dev(dev), size, dma_handle);
}
static inline void
dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_handle)
{
BUG_ON(dev->bus != &pci_bus_type);
pci_free_consistent(to_pci_dev(dev), size, cpu_addr, dma_handle);
}
static inline dma_addr_t
dma_map_single(struct device *dev, void *cpu_addr, size_t size,
enum dma_data_direction direction)
{
BUG_ON(dev->bus != &pci_bus_type);
return pci_map_single(to_pci_dev(dev), cpu_addr, size, (int)direction);
}
static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction)
{
BUG_ON(dev->bus != &pci_bus_type);
pci_unmap_single(to_pci_dev(dev), dma_addr, size, (int)direction);
}
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(dev->bus != &pci_bus_type);
return pci_map_page(to_pci_dev(dev), page, offset, size, (int)direction);
}
static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
enum dma_data_direction direction)
{
BUG_ON(dev->bus != &pci_bus_type);
pci_unmap_page(to_pci_dev(dev), dma_address, size, (int)direction);
}
static inline int
dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction direction)
{
BUG_ON(dev->bus != &pci_bus_type);
return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
}
static inline void
dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
enum dma_data_direction direction)
{
BUG_ON(dev->bus != &pci_bus_type);
pci_unmap_sg(to_pci_dev(dev), sg, nhwentries, (int)direction);
}
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(dev->bus != &pci_bus_type);
pci_dma_sync_single_for_cpu(to_pci_dev(dev), dma_handle,
size, (int)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(dev->bus != &pci_bus_type);
pci_dma_sync_single_for_device(to_pci_dev(dev), dma_handle,
size, (int)direction);
}
static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction direction)
{
BUG_ON(dev->bus != &pci_bus_type);
pci_dma_sync_sg_for_cpu(to_pci_dev(dev), sg, nelems, (int)direction);
}
static inline void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction direction)
{
BUG_ON(dev->bus != &pci_bus_type);
pci_dma_sync_sg_for_device(to_pci_dev(dev), sg, nelems, (int)direction);
}
static inline int
dma_mapping_error(dma_addr_t dma_addr)
{
return pci_dma_mapping_error(dma_addr);
}
#else
static inline int
dma_supported(struct device *dev, u64 mask)
{
return 0;
}
static inline int
dma_set_mask(struct device *dev, u64 dma_mask)
{
BUG();
return 0;
}
static inline void *
dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t flag)
{
BUG();
return NULL;
}
static inline void
dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_handle)
{
BUG();
}
static inline dma_addr_t
dma_map_single(struct device *dev, void *cpu_addr, size_t size,
enum dma_data_direction direction)
{
BUG();
return 0;
}
static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction)
{
BUG();
}
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();
return 0;
}
static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
enum dma_data_direction direction)
{
BUG();
}
static inline int
dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction direction)
{
BUG();
return 0;
}
static inline void
dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
enum dma_data_direction direction)
{
BUG();
}
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();
}
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();
}
static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction direction)
{
BUG();
}
static inline void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction direction)
{
BUG();
}
static inline int
dma_error(dma_addr_t dma_addr)
{
return 0;
}
#endif
/* Now for the API extensions over the pci_ one */
#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)
#define dma_is_consistent(d) (1)
static inline int
dma_get_cache_alignment(void)
{
/* no easy way to get cache size on all processors, so return
* the maximum possible, to be safe */
return (1 << L1_CACHE_SHIFT_MAX);
}
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, that's all the pci API can do */
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, that's all the pci API can do */
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)
{
/* could define this in terms of the dma_cache ... operations,
* but if you get this on a platform, you should convert the platform
* to using the generic device DMA API */
BUG();
}
#endif