cpu/uc3/include/cpu/dma.h File Reference

DMA mapping for AVR32 UC3. More...

#include <types.h>

Include dependency graph for dma.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures
union	buffer_addr_t
	A physical/virtual address pair used in struct buffer. More...
Defines
#define	CPU_DMA_ALIGN   2
	log2 of the minimum alignment of DMA-able objects
Functions
static void	dma_sync_for_device (void *vaddr, size_t size, enum dma_direction direction)
	Synchronize a DMA buffer before transfer.
static void	dma_sync_for_cpu (void *vaddr, size_t size, enum dma_direction direction)
	Synchronize a DMA buffer after transfer.
static phys_addr_t	dma_map_single (void *vaddr, size_t size, enum dma_direction direction)
	Map a single contiguous buffer for DMA transfer.
static void	dma_unmap_single (void *vaddr, size_t size, enum dma_direction direction)
	Unmap a single contiguous buffer after a DMA transfer.

---

Detailed Description

DMA mapping for AVR32 UC3.

• Compiler: IAR EWAVR32 and GNU GCC for AVR32
• Supported devices: All AVR32 UC3 devices
• AppNote:

Author:

Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

Definition in file dma.h.

---

Define Documentation

#define CPU_DMA_ALIGN   2

log2 of the minimum alignment of DMA-able objects

Definition at line 47 of file dma.h.

---

Function Documentation

static phys_addr_t dma_map_single	(	void *	vaddr,
		size_t	size,
		enum dma_direction	direction
	)			[inline, static]

Map a single contiguous buffer for DMA transfer.

After this function has been called, the device can access the buffer, but the CPU must not.

Parameters:

	vaddr	The virtual address of the buffer
	size	The length of the buffer in bytes
	direction	The direction of the transfer

Returns:

The physical address of the buffer

Definition at line 104 of file dma.h.

Referenced by buffer_init_rx(), and buffer_init_tx().

static void dma_sync_for_cpu	(	void *	vaddr,
		size_t	size,
		enum dma_direction	direction
	)			[inline, static]

Synchronize a DMA buffer after transfer.

After this function has been called, the CPU can access the buffer, but the device must not.

Parameters:

	vaddr	The virtual address of the buffer
	size	The length of the buffer in bytes
	direction	The direction of the transfer

Definition at line 86 of file dma.h.

static void dma_sync_for_device	(	void *	vaddr,
		size_t	size,
		enum dma_direction	direction
	)			[inline, static]

Synchronize a DMA buffer before transfer.

After this function has been called, the device can access the buffer, but the CPU must not.

Parameters:

	vaddr	The virtual address of the buffer
	size	The length of the buffer in bytes
	direction	The direction of the transfer

Definition at line 70 of file dma.h.

static void dma_unmap_single	(	void *	vaddr,
		size_t	size,
		enum dma_direction	direction
	)			[inline, static]

Unmap a single contiguous buffer after a DMA transfer.

After this function has been called, the CPU can access the buffer, but the device must not.

Parameters:

	vaddr	The virtual address of the buffer
	size	The length of the buffer in bytes
	direction	The direction of the transfer

Returns:

The physical address of the buffer

Definition at line 122 of file dma.h.