dma.h File Reference

#include <stddef.h>
#include <stdint.h>
#include <pbl/device.h>

Data Structures
struct	pbl_dma_slave_config
	Peripheral side of a channel. More...
struct	pbl_dma_chan
	A channel, as used by a consumer. More...
struct	pbl_dma_controller_ops
	DMA controller driver operations. More...
struct	pbl_dma_chan_state
	Runtime state of a channel. More...
struct	pbl_dma_controller
	A DMA controller. More...

Macros
#define	PBL_DMA_CHAN(_ctrl, _channel, _request, _config)    {.ctrl = (_ctrl), .channel = (_channel), .request = (_request), .config = (_config)}
	Initializer for a struct pbl_dma_chan.
#define	PBL_DMA_CONTROLLER_STATE_DEFINE(sym, _num_channels)
	Define the class state of DMA controller sym, for the driver's define macro.
#define	PBL_DMA_CONTROLLER_INIT(sym, _name, _init, _ops)
	Initializer for the struct pbl_dma_controller of controller sym.

Typedefs
typedef void(*	pbl_dma_callback_t) (void *arg, int status)
	Transfer end callback, called from interrupt context.

Enumerations
enum	pbl_dma_dir { PBL_DMA_MEM_TO_DEV , PBL_DMA_DEV_TO_MEM }
	Transfer direction. More...
enum	pbl_dma_slave_buswidth { PBL_DMA_SLAVE_BUSWIDTH_1_BYTE = 1 , PBL_DMA_SLAVE_BUSWIDTH_2_BYTES = 2 , PBL_DMA_SLAVE_BUSWIDTH_4_BYTES = 4 }
	Peripheral register width, in bytes. More...

Functions
int	pbl_dma_slave_config (const struct pbl_dma_chan *chan, const struct pbl_dma_slave_config *cfg)
	Set the peripheral side of a stopped channel up.
int	pbl_dma_prep_slave_single (const struct pbl_dma_chan *chan, void *buf, size_t len, enum pbl_dma_dir dir, pbl_dma_callback_t callback, void *arg)
	Start a transfer between a buffer and the peripheral.
int	pbl_dma_terminate (const struct pbl_dma_chan *chan)
	Stop a channel.
int	pbl_dma_tx_status (const struct pbl_dma_chan *chan, size_t *residue)
	Read the bytes left of a channel's transfer.
void	pbl_dma_complete (const struct pbl_dma_controller *ctrl, uint8_t channel, int status)
	Report the end of a channel's transfer, calling its callback.

Variables
const struct pbl_device_class	pbl_dma_class
	Class of the DMA controllers.