dma.h File Reference

Public APIs for the DMA drivers. More...

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/syscalls/dma.h>

Go to the source code of this file.

Data Structures
struct	dma_block_config
	DMA block configuration structure. More...
struct	dma_config
	DMA configuration structure. More...
struct	dma_status
	DMA runtime status structure. More...
struct	dma_context
	DMA context structure Note: the dma_context shall be the first member of DMA client driver Data, got by dev->data. More...

Macros
#define	DMA_STATUS_COMPLETE   0
	The DMA callback event has occurred at the completion of a transfer list.
#define	DMA_STATUS_BLOCK   1
	The DMA callback has occurred at the completion of a single transfer block in a transfer list.
#define	DMA_MAGIC   0x47494749
	Magic code to identify context content.
#define	DMA_BUF_ADDR_ALIGNMENT(node)   DT_PROP(node, dma_buf_addr_alignment)
	Get the device tree property describing the buffer address alignment.
#define	DMA_BUF_SIZE_ALIGNMENT(node)   DT_PROP(node, dma_buf_size_alignment)
	Get the device tree property describing the buffer size alignment.
#define	DMA_COPY_ALIGNMENT(node)   DT_PROP(node, dma_copy_alignment)
	Get the device tree property describing the minimal chunk of data possible to be copied.

Typedefs
typedef void(*	dma_callback_t) (const struct device *dev, void *user_data, uint32_t channel, int status)
	Callback function for DMA transfer completion.

Enumerations
enum	dma_channel_direction {   MEMORY_TO_MEMORY = 0x0 , MEMORY_TO_PERIPHERAL , PERIPHERAL_TO_MEMORY , PERIPHERAL_TO_PERIPHERAL ,   HOST_TO_MEMORY , MEMORY_TO_HOST , DMA_CHANNEL_DIRECTION_COMMON_COUNT , DMA_CHANNEL_DIRECTION_PRIV_START = DMA_CHANNEL_DIRECTION_COMMON_COUNT ,   DMA_CHANNEL_DIRECTION_MAX = 0x7 }
	DMA channel direction. More...
enum	dma_addr_adj { DMA_ADDR_ADJ_INCREMENT , DMA_ADDR_ADJ_DECREMENT , DMA_ADDR_ADJ_NO_CHANGE }
	DMA address adjustment. More...
enum	dma_channel_filter { DMA_CHANNEL_NORMAL , DMA_CHANNEL_PERIODIC }
	DMA channel attributes. More...
enum	dma_attribute_type { DMA_ATTR_BUFFER_ADDRESS_ALIGNMENT , DMA_ATTR_BUFFER_SIZE_ALIGNMENT , DMA_ATTR_COPY_ALIGNMENT , DMA_ATTR_MAX_BLOCK_COUNT }
	DMA attributes. More...

Functions
static int	dma_config (const struct device *dev, uint32_t channel, struct dma_config *config)
	Configure individual channel for DMA transfer.
static int	dma_reload (const struct device *dev, uint32_t channel, uint32_t src, uint32_t dst, size_t size)
	Reload buffer(s) for a DMA channel.
int	dma_start (const struct device *dev, uint32_t channel)
	Enables DMA channel and starts the transfer, the channel must be configured beforehand.
int	dma_stop (const struct device *dev, uint32_t channel)
	Stops the DMA transfer and disables the channel.
int	dma_suspend (const struct device *dev, uint32_t channel)
	Suspend a DMA channel transfer.
int	dma_resume (const struct device *dev, uint32_t channel)
	Resume a DMA channel transfer.
int	dma_request_channel (const struct device *dev, void *filter_param)
	request DMA channel.
void	dma_release_channel (const struct device *dev, uint32_t channel)
	release DMA channel.
int	dma_chan_filter (const struct device *dev, int channel, void *filter_param)
	DMA channel filter.
static int	dma_get_status (const struct device *dev, uint32_t channel, struct dma_status *stat)
	get current runtime status of DMA transfer
static int	dma_get_attribute (const struct device *dev, uint32_t type, uint32_t *value)
	get attribute of a dma controller
static uint32_t	dma_width_index (uint32_t size)
	Look-up generic width index to be used in registers.
static uint32_t	dma_burst_index (uint32_t burst)
	Look-up generic burst index to be used in registers.

Detailed Description

Public APIs for the DMA drivers.