rt_dma_controller Struct Reference

#include <dma.h>

Public Member Functions
	RT_BITMAP_DECLARE (dir_cap, RT_DMA_DIR_MAX)

Data Fields
rt_list_t	list
struct rt_device *	dev
rt_uint64_t	addr_mask
const struct rt_dma_controller_ops *	ops
rt_list_t	channels_nodes
struct rt_mutex	mutex

Detailed Description

DMA controller descriptor.

Represents a single DMA controller instance. Each controller has a set of operations (ops), supported transfer directions (dir_cap), an address mask for validating transfer addresses, and a list of currently allocated channels.

Member Function Documentation

RT_BITMAP_DECLARE()

rt_dma_controller::RT_BITMAP_DECLARE	(	dir_cap	,
		RT_DMA_DIR_MAX
	)

Bitmap of supported transfer directions

Field Documentation

list

rt_list_t rt_dma_controller::list

Node in the global controller list

dev

struct rt_device* rt_dma_controller::dev

Owning platform device

addr_mask

rt_uint64_t rt_dma_controller::addr_mask

Compute DMA address mask from bit width (e.g., RT_DMA_ADDR_MASK(32) = 0xFFFFFFFF)

Address mask: bits outside this mask are invalid for DMA

ops

const struct rt_dma_controller_ops* rt_dma_controller::ops

Controller-specific operations

channels_nodes

rt_list_t rt_dma_controller::channels_nodes

List of currently allocated channels

mutex

struct rt_mutex rt_dma_controller::mutex

Mutex for controller-level operations