xdma_channel_i.h

Uboot源码,非常通用的bootloader.适用于各种平台的Linux系统引导.

/******************************************************************************
*
*     Author: Xilinx, Inc.
*
*
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*     (c) Copyright 2002-2004 Xilinx Inc.
*     All rights reserved.
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*     You should have received a copy of the GNU General Public License along
*     with this program; if not, write to the Free Software Foundation, Inc.,
*     675 Mass Ave, Cambridge, MA 02139, USA.
*
* FILENAME:
*
* xdma_channel_i.h
*
* DESCRIPTION:
*
* This file contains data which is shared internal data for the DMA channel
* component. It is also shared with the buffer descriptor component which is
* very tightly coupled with the DMA channel component.
*
* NOTES:
*
* The last buffer descriptor constants must be located here to prevent a
* circular dependency between the DMA channel component and the buffer
* descriptor component.
*
******************************************************************************/

#ifndef XDMA_CHANNEL_I_H	/* prevent circular inclusions */
#define XDMA_CHANNEL_I_H	/* by using protection macros */

/***************************** Include Files *********************************/

#include "xbasic_types.h"
#include "xstatus.h"
#include "xversion.h"

/************************** Constant Definitions *****************************/

#define XDC_DMA_CHANNEL_V1_00_A		"1.00a"

/* the following constant provides access to the bit fields of the DMA control
 * register (DMACR) which must be shared between the DMA channel component
 * and the buffer descriptor component
 */
#define XDC_CONTROL_LAST_BD_MASK	0x02000000UL	/* last buffer descriptor */

/* the following constant provides access to the bit fields of the DMA status
 * register (DMASR) which must be shared between the DMA channel component
 * and the buffer descriptor component
 */
#define XDC_STATUS_LAST_BD_MASK		0x10000000UL	/* last buffer descriptor */

/* the following constants provide access to each of the registers of a DMA
 * channel
 */
#define XDC_RST_REG_OFFSET	0	/* reset register */
#define XDC_MI_REG_OFFSET	0	/* module information register */
#define XDC_DMAC_REG_OFFSET	4	/* DMA control register */
#define XDC_SA_REG_OFFSET	8	/* source address register */
#define XDC_DA_REG_OFFSET	12	/* destination address register */
#define XDC_LEN_REG_OFFSET	16	/* length register */
#define XDC_DMAS_REG_OFFSET	20	/* DMA status register */
#define XDC_BDA_REG_OFFSET	24	/* buffer descriptor address register */
#define XDC_SWCR_REG_OFFSET 28	/* software control register */
#define XDC_UPC_REG_OFFSET	32	/* unserviced packet count register */
#define	XDC_PCT_REG_OFFSET	36	/* packet count threshold register */
#define XDC_PWB_REG_OFFSET	40	/* packet wait bound register */
#define XDC_IS_REG_OFFSET	44	/* interrupt status register */
#define XDC_IE_REG_OFFSET	48	/* interrupt enable register */

/* the following constant is written to the reset register to reset the
 * DMA channel
 */
#define XDC_RESET_MASK				0x0000000AUL

/**************************** Type Definitions *******************************/

/***************** Macros (Inline Functions) Definitions *********************/

/************************** Function Prototypes ******************************/

#endif				/* end of protection macro */