include/linux/platform_data/dma-dw.h

Source file repositories/reference/linux-study-clean/include/linux/platform_data/dma-dw.h

File Facts

System
Linux kernel
Corpus path
include/linux/platform_data/dma-dw.h
Extension
.h
Size
2633 bytes
Lines
80
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct dw_dma_slave {
	struct device		*dma_dev;
	u8			src_id;
	u8			dst_id;
	u8			m_master;
	u8			p_master;
	u8			channels;
	bool			hs_polarity;
};

/**
 * struct dw_dma_platform_data - Controller configuration parameters
 * @nr_masters: Number of AHB masters supported by the controller
 * @nr_channels: Number of channels supported by hardware (max 8)
 * @chan_allocation_order: Allocate channels starting from 0 or 7
 * @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0.
 * @block_size: Maximum block size supported by the controller
 * @data_width: Maximum data width supported by hardware per AHB master
 *		(in bytes, power of 2)
 * @multi_block: Multi block transfers supported by hardware per channel.
 * @max_burst: Maximum value of burst transaction size supported by hardware
 *	       per channel (in units of CTL.SRC_TR_WIDTH/CTL.DST_TR_WIDTH).
 * @protctl: Protection control signals setting per channel.
 * @quirks: Optional platform quirks.
 */
struct dw_dma_platform_data {
	u32		nr_masters;
	u32		nr_channels;
#define CHAN_ALLOCATION_ASCENDING	0	/* zero to seven */
#define CHAN_ALLOCATION_DESCENDING	1	/* seven to zero */
	u32		chan_allocation_order;
#define CHAN_PRIORITY_ASCENDING		0	/* chan0 highest */
#define CHAN_PRIORITY_DESCENDING	1	/* chan7 highest */
	u32		chan_priority;
	u32		block_size;
	u32		data_width[DW_DMA_MAX_NR_MASTERS];
	u32		multi_block[DW_DMA_MAX_NR_CHANNELS];
	u32		max_burst[DW_DMA_MAX_NR_CHANNELS];
#define CHAN_PROTCTL_PRIVILEGED		BIT(0)
#define CHAN_PROTCTL_BUFFERABLE		BIT(1)
#define CHAN_PROTCTL_CACHEABLE		BIT(2)
#define CHAN_PROTCTL_MASK		GENMASK(2, 0)
	u32		protctl;
#define DW_DMA_QUIRK_XBAR_PRESENT	BIT(0)
	u32		quirks;
};

#endif /* _PLATFORM_DATA_DMA_DW_H */

Annotation

Implementation Notes