dma-mapping.h File Reference

#include <linux/device.h>
#include <asm/cache.h>
#include <asm/cacheflush.h>
#include <asm/scatterlist.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_alloc_coherent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp)
void	dma_free_coherent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle)
dma_addr_t	dma_map_single (struct device *dev, void *ptr, size_t size, enum dma_data_direction direction)
int	dma_map_sg (struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction)
dma_addr_t	dma_map_page (struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction)

Variables
unsigned long __nongprelbss	dma_coherent_mem_start
unsigned long __nongprelbss	dma_coherent_mem_end

Macro Definition Documentation

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

Definition at line 15 of file dma-mapping.h.

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

Definition at line 16 of file dma-mapping.h.

Function Documentation

void* dma_alloc_coherent	(	struct device *	dev,
		size_t	size,
		dma_addr_t *	dma_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_free_coherent	(	struct device *	dev,
		size_t	size,
		void *	vaddr,
		dma_addr_t	dma_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.

dma_addr_t dma_map_page	(	struct device *	dev,
		struct page *	page,
		unsigned long	offset,
		size_t	size,
		enum dma_data_direction	direction
	)

Definition at line 138 of file pci-dma-nommu.c.

int dma_map_sg	(	struct device *	dev,
		struct scatterlist *	sg,
		int	nents,
		enum dma_data_direction	direction
	)

Definition at line 125 of file dma-mapping.c.

dma_addr_t dma_map_single	(	struct device *	dev,
		void *	ptr,
		size_t	size,
		enum dma_data_direction	direction
	)

Definition at line 39 of file dma.c.

Variable Documentation

unsigned long __nongprelbss dma_coherent_mem_end

Definition at line 102 of file setup.c.

unsigned long __nongprelbss dma_coherent_mem_start

Definition at line 101 of file setup.c.