dma-mapping.h File Reference

#include <linux/mm.h>
#include <linux/device.h>
#include <linux/scatterlist.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/io.h>

Go to the source code of this file.

Macros
#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)

Functions
void	dma_cache_sync (struct device *dev, void *vaddr, size_t size, int direction)
void *	dma_alloc_coherent (struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
void	dma_free_coherent (struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle)
void *	dma_alloc_writecombine (struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
void	dma_free_writecombine (struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle)

Macro Definition Documentation

#define dma_alloc_noncoherent	(		d,
			s,
			h,
			f
	)		dma_alloc_coherent(d, s, h, f)

Definition at line 336 of file dma-mapping.h.

#define dma_free_noncoherent	(		d,
			s,
			v,
			h
	)		dma_free_coherent(d, s, v, h)

Definition at line 337 of file dma-mapping.h.

Function Documentation

void* dma_alloc_coherent	(	struct device *	dev,
		size_t	size,
		dma_addr_t *	handle,
		gfp_t	gfp
	)

dma_alloc_coherent - allocate consistent memory for DMA : valid struct device pointer, or NULL for ISA and EISA-like devices : required memory size : bus-specific DMA address

Allocate some uncached, unbuffered memory for a device for performing DMA. This function allocates pages, and will return the CPU-viewed address, and sets to be the device-viewed address.

Definition at line 96 of file dma-coherent.c.

void* dma_alloc_writecombine	(	struct device *	dev,
		size_t	size,
		dma_addr_t *	handle,
		gfp_t	gfp
	)

dma_alloc_writecombine - allocate write-combining memory for DMA : valid struct device pointer, or NULL for ISA and EISA-like devices : required memory size : bus-specific DMA address

Allocate some uncached, buffered memory for a device for performing DMA. This function allocates pages, and will return the CPU-viewed address, and sets to be the device-viewed address.

Definition at line 124 of file dma-coherent.c.

void dma_cache_sync	(	struct device *	dev,
		void *	vaddr,
		size_t	size,
		int	direction
	)

Definition at line 16 of file dma-coherent.c.

void dma_free_coherent	(	struct device *	dev,
		size_t	size,
		void *	cpu_addr,
		dma_addr_t	handle
	)

dma_free_coherent - free memory allocated by dma_alloc_coherent : valid struct device pointer, or NULL for ISA and EISA-like devices : size of memory originally requested in dma_alloc_coherent : CPU-view address returned from dma_alloc_coherent : device-view address returned from dma_alloc_coherent

Free (and unmap) a DMA buffer previously allocated by dma_alloc_coherent().

References to memory and mappings associated with cpu_addr/handle during and after this call executing are illegal.

Definition at line 110 of file dma-coherent.c.

void dma_free_writecombine	(	struct device *	dev,
		size_t	size,
		void *	cpu_addr,
		dma_addr_t	handle
	)

dma_free_coherent - free memory allocated by dma_alloc_writecombine : valid struct device pointer, or NULL for ISA and EISA-like devices : size of memory originally requested in dma_alloc_writecombine : CPU-view address returned from dma_alloc_writecombine : device-view address returned from dma_alloc_writecombine

Free (and unmap) a DMA buffer previously allocated by dma_alloc_writecombine().

References to memory and mappings associated with cpu_addr/handle during and after this call executing are illegal.

Definition at line 142 of file dma-coherent.c.