arch/sh/include/cpu-sh3/cpu/dma-register.h

Source file repositories/reference/linux-study-clean/arch/sh/include/cpu-sh3/cpu/dma-register.h

File Facts

System
Linux kernel
Corpus path
arch/sh/include/cpu-sh3/cpu/dma-register.h
Extension
.h
Size
855 bytes
Lines
39
Domain
Architecture Layer
Bucket
arch/sh
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

#ifndef CPU_DMA_REGISTER_H
#define CPU_DMA_REGISTER_H

#define CHCR_TS_LOW_MASK	0x18
#define CHCR_TS_LOW_SHIFT	3
#define CHCR_TS_HIGH_MASK	0
#define CHCR_TS_HIGH_SHIFT	0

#define DMAOR_INIT	DMAOR_DME

/*
 * The SuperH DMAC supports a number of transmit sizes, we list them here,
 * with their respective values as they appear in the CHCR registers.
 */
enum {
	XMIT_SZ_8BIT,
	XMIT_SZ_16BIT,
	XMIT_SZ_32BIT,
	XMIT_SZ_128BIT,
};

/* log2(size / 8) - used to calculate number of transfers */
#define TS_SHIFT {			\
	[XMIT_SZ_8BIT]		= 0,	\
	[XMIT_SZ_16BIT]		= 1,	\
	[XMIT_SZ_32BIT]		= 2,	\
	[XMIT_SZ_128BIT]	= 4,	\
}

#define TS_INDEX2VAL(i)	(((i) & 3) << CHCR_TS_LOW_SHIFT)

#endif

Annotation

Implementation Notes