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#ifndef _LINUX_DMA_MAPPING_H
#define _LINUX_DMA_MAPPING_H
#include <linux/device.h>
#include <linux/err.h>
/* These definitions mirror those in pci.h, so they can be used
* interchangeably with their PCI_ counterparts */
enum dma_data_direction {
DMA_BIDIRECTIONAL = 0,
DMA_TO_DEVICE = 1,
DMA_FROM_DEVICE = 2,
DMA_NONE = 3,
};
#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
/*
* NOTE: do not use the below macros in new code and do not add new definitions
* here.
*
* Instead, just open-code DMA_BIT_MASK(n) within your driver
*/
#define DMA_64BIT_MASK DMA_BIT_MASK(64)
#define DMA_48BIT_MASK DMA_BIT_MASK(48)
#define DMA_47BIT_MASK DMA_BIT_MASK(47)
#define DMA_40BIT_MASK DMA_BIT_MASK(40)
#define DMA_39BIT_MASK DMA_BIT_MASK(39)
#define DMA_35BIT_MASK DMA_BIT_MASK(35)
#define DMA_32BIT_MASK DMA_BIT_MASK(32)
#define DMA_31BIT_MASK DMA_BIT_MASK(31)
#define DMA_30BIT_MASK DMA_BIT_MASK(30)
#define DMA_29BIT_MASK DMA_BIT_MASK(29)
#define DMA_28BIT_MASK DMA_BIT_MASK(28)
#define DMA_24BIT_MASK DMA_BIT_MASK(24)
#define DMA_MASK_NONE 0x0ULL
static inline int valid_dma_direction(int dma_direction)
{
return ((dma_direction == DMA_BIDIRECTIONAL) ||
(dma_direction == DMA_TO_DEVICE) ||
(dma_direction == DMA_FROM_DEVICE));
}
static inline int is_device_dma_capable(struct device *dev)
{
return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
}
static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size)
{
return addr + size <= mask;
}
#ifdef CONFIG_HAS_DMA
#include <asm/dma-mapping.h>
#else
#include <asm-generic/dma-mapping-broken.h>
#endif
/* Backwards compat, remove in 2.7.x */
#define dma_sync_single dma_sync_single_for_cpu
#define dma_sync_sg dma_sync_sg_for_cpu
static inline u64 dma_get_mask(struct device *dev)
{
if (dev->dma_mask && *dev->dma_mask)
return *dev->dma_mask;
return DMA_32BIT_MASK;
}
extern u64 dma_get_required_mask(struct device *dev);
static inline unsigned int dma_get_max_seg_size(struct device *dev)
{
return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
}
static inline unsigned int dma_set_max_seg_size(struct device *dev,
unsigned int size)
{
if (dev->dma_parms) {
dev->dma_parms->max_segment_size = size;
return 0;
} else
return -EIO;
}
static inline unsigned long dma_get_seg_boundary(struct device *dev)
{
return dev->dma_parms ?
dev->dma_parms->segment_boundary_mask : 0xffffffff;
}
static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
{
if (dev->dma_parms) {
dev->dma_parms->segment_boundary_mask = mask;
return 0;
} else
return -EIO;
}
/* flags for the coherent memory api */
#define DMA_MEMORY_MAP 0x01
#define DMA_MEMORY_IO 0x02
#define DMA_MEMORY_INCLUDES_CHILDREN 0x04
#define DMA_MEMORY_EXCLUSIVE 0x08
#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
static inline int
dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
dma_addr_t device_addr, size_t size, int flags)
{
return 0;
}
static inline void
dma_release_declared_memory(struct device *dev)
{
}
static inline void *
dma_mark_declared_memory_occupied(struct device *dev,
dma_addr_t device_addr, size_t size)
{
return ERR_PTR(-EBUSY);
}
#endif
/*
* Managed DMA API
*/
extern void *dmam_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle);
extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle);
#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
dma_addr_t device_addr, size_t size,
int flags);
extern void dmam_release_declared_memory(struct device *dev);
#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
static inline int dmam_declare_coherent_memory(struct device *dev,
dma_addr_t bus_addr, dma_addr_t device_addr,
size_t size, gfp_t gfp)
{
return 0;
}
static inline void dmam_release_declared_memory(struct device *dev)
{
}
#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
#ifndef CONFIG_HAVE_DMA_ATTRS
struct dma_attrs;
#define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
dma_map_single(dev, cpu_addr, size, dir)
#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
dma_unmap_single(dev, dma_addr, size, dir)
#define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
dma_map_sg(dev, sgl, nents, dir)
#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
dma_unmap_sg(dev, sgl, nents, dir)
#endif /* CONFIG_HAVE_DMA_ATTRS */
#endif
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