arch/mips/include/asm/mach-rc32434/dma.h

Source file repositories/reference/linux-study-clean/arch/mips/include/asm/mach-rc32434/dma.h

File Facts

System
Linux kernel
Corpus path
arch/mips/include/asm/mach-rc32434/dma.h
Extension
.h
Size
2667 bytes
Lines
105
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct dma_desc {
	u32 control;			/* Control. use DMAD_* */
	u32 ca;				/* Current Address. */
	u32 devcs;			/* Device control and status. */
	u32 link;			/* Next descriptor in chain. */
};

#define DMA_DESC_SIZ			sizeof(struct dma_desc)
#define DMA_DESC_COUNT_BIT		0
#define DMA_DESC_COUNT_MSK		0x0003ffff
#define DMA_DESC_DS_BIT			20
#define DMA_DESC_DS_MSK			0x00300000

#define DMA_DESC_DEV_CMD_BIT		22
#define DMA_DESC_DEV_CMD_MSK		0x01c00000

/* DMA command sizes */
#define DMA_DESC_DEV_CMD_BYTE		0
#define DMA_DESC_DEV_CMD_HLF_WD		1
#define DMA_DESC_DEV_CMD_WORD		2
#define DMA_DESC_DEV_CMD_2WORDS		3
#define DMA_DESC_DEV_CMD_4WORDS		4
#define DMA_DESC_DEV_CMD_6WORDS		5
#define DMA_DESC_DEV_CMD_8WORDS		6
#define DMA_DESC_DEV_CMD_16WORDS	7

/* DMA descriptors interrupts */
#define DMA_DESC_COF			(1 << 25) /* Chain on finished */
#define DMA_DESC_COD			(1 << 26) /* Chain on done */
#define DMA_DESC_IOF			(1 << 27) /* Interrupt on finished */
#define DMA_DESC_IOD			(1 << 28) /* Interrupt on done */
#define DMA_DESC_TERM			(1 << 29) /* Terminated */
#define DMA_DESC_DONE			(1 << 30) /* Done */
#define DMA_DESC_FINI			(1 << 31) /* Finished */

/*
 * DMA register (within Internal Register Map).
 */

struct dma_reg {
	u32 dmac;		/* Control. */
	u32 dmas;		/* Status. */
	u32 dmasm;		/* Mask. */
	u32 dmadptr;		/* Descriptor pointer. */
	u32 dmandptr;		/* Next descriptor pointer. */
};

/* DMA channels specific registers */
#define DMA_CHAN_RUN_BIT		(1 << 0)
#define DMA_CHAN_DONE_BIT		(1 << 1)
#define DMA_CHAN_MODE_BIT		(1 << 2)
#define DMA_CHAN_MODE_MSK		0x0000000c
#define	 DMA_CHAN_MODE_AUTO		0
#define	 DMA_CHAN_MODE_BURST		1
#define	 DMA_CHAN_MODE_XFRT		2
#define	 DMA_CHAN_MODE_RSVD		3
#define DMA_CHAN_ACT_BIT		(1 << 4)

/* DMA status registers */
#define DMA_STAT_FINI			(1 << 0)
#define DMA_STAT_DONE			(1 << 1)
#define DMA_STAT_CHAIN			(1 << 2)
#define DMA_STAT_ERR			(1 << 3)
#define DMA_STAT_HALT			(1 << 4)

/*
 * DMA channel definitions
 */

#define DMA_CHAN_ETH_RCV		0
#define DMA_CHAN_ETH_XMT		1
#define DMA_CHAN_MEM_TO_FIFO		2
#define DMA_CHAN_FIFO_TO_MEM		3
#define DMA_CHAN_PCI_TO_MEM		4
#define DMA_CHAN_MEM_TO_PCI		5
#define DMA_CHAN_COUNT			6

struct dma_channel {
	struct dma_reg ch[DMA_CHAN_COUNT];
};

#endif	/* __ASM_RC32434_DMA_H */

Annotation

Implementation Notes