dma.h

LINUX 2.6.17.4的源码

#ifndef __ASM_CPU_SH4_DMA_H
#define __ASM_CPU_SH4_DMA_H

#ifdef CONFIG_CPU_SH4A
#define SH_DMAC_BASE	0xfc808020
#else
#define SH_DMAC_BASE	0xffa00000
#endif

/* Definitions for the SuperH DMAC */
#define TM_BURST	0x0000080
#define TS_8		0x00000010
#define TS_16		0x00000020
#define TS_32		0x00000030
#define TS_64		0x00000000

#define CHCR_TS_MASK	0x30
#define CHCR_TS_SHIFT	4

#define DMAOR_COD	0x00000008

#define DMAOR_INIT	( 0x8000 | 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.
 *
 * Defaults to a 64-bit transfer size.
 */
enum {
	XMIT_SZ_64BIT,
	XMIT_SZ_8BIT,
	XMIT_SZ_16BIT,
	XMIT_SZ_32BIT,
	XMIT_SZ_256BIT,
};

/*
 * The DMA count is defined as the number of bytes to transfer.
 */
static unsigned int ts_shift[] __attribute__ ((used)) = {
	[XMIT_SZ_64BIT]		= 3,
	[XMIT_SZ_8BIT]		= 0,
	[XMIT_SZ_16BIT]		= 1,
	[XMIT_SZ_32BIT]		= 2,
	[XMIT_SZ_256BIT]	= 5,
};

#endif /* __ASM_CPU_SH4_DMA_H */