nandflash.h

针对at91系列的arm的启动代码的编写有一个整体的说明

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support  -  ROUSSET  -
 * ----------------------------------------------------------------------------
 * Copyright (c) 2006, Atmel Corporation

 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the disclaimer below in the documentation and/or
 * other materials provided with the distribution.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ----------------------------------------------------------------------------
 * File Name           : nandflash.h
 * Object              :
 * Creation            : NLe Sep 28th 2006
 *-----------------------------------------------------------------------------
 */
#ifndef _NANDFLASH_H
#define _NANDFLASH_H

typedef struct SNandInitInfo
{
	unsigned int uNandID		; /* Nand Chip ID */
	unsigned int uNandNbBlocks	;	
	unsigned int uNandBlockSize	;
	unsigned int uNandSectorSize	;
	unsigned int uNandSpareSize	;
	unsigned int uNandBusWidth	;
	char 	     name[40]		; /* Nand Name */
} SNandInitInfo, *PSNandInitInfo;

/* Group all usefull sizes for the nandflash chip */
typedef struct _NandInfo
{
	unsigned int uDataNbBytes	;	/* Nb of bytes in data section */
	unsigned int uSpareNbBytes	;	/* Nb of bytes in spare section */
	unsigned int uSectorNbBytes	;	/* Total nb of bytes in a sector */

	unsigned int uBlockNbSectors	;	/* Nb of sector in a block */
	unsigned int uBlockNbData	;	/* Nb of DataBytes in a block */
	unsigned int uBlockNbSpares	;	/* Nb of SpareBytes in a block */
	unsigned int uBlockNbBytes	;	/* Total nb of bytes in a block */

	unsigned int uNbBlocks		;	/* Nb of blocks in device */
	unsigned int uNbSectors		;	/* Total nb of sectors in device */
	unsigned int uNbData		;	/* Nb of DataBytes in device */
	unsigned int uNbSpares		;	/* Nb of SpareBytes in device */
	unsigned int uNbBytes		;	/* Total nb of bytes in device */
	unsigned int uOffset		;

	unsigned int uDataBusWidth	;	/* Data Bus Width (8/16 bits) */

} SNandInfo, *PSNandInfo;

/* Sector Info Structure */
typedef struct  __attribute__((__packed__)) _SectorInfo
{
    unsigned int dwReserved1;       /* Reserved - used by FAL */
    char  bOEMReserved;             /* For use by OEM */
    char  bBadBlock;	            /* Indicates if block is BAD */
    short wReserved2;               /* Reserved - used by FAL */
}SSectorInfo, *PSSectorInfo;


/* Wait mode */
#define WAIT_POOL			POOL_ON_READYBUSY		/* Default pool mode */
#define WAIT_INTERRUPT			INTERRUPT_ON_READYBUSY		/* Default interrupt mode */
#define	ERASE_TIMEOUT			10				/* erase maximum time in ms */
#define RESET_TIMEOUT			10				/* reset maximum time in ms */
#define READ_TIMEOUT			10				/* read maximum time in ms */
#define WRITE_TIMEOUT			10				/* write maximum time in ms */

#define POOL_ON_READYBUSY		0x01				/* Pool on ReadyBusy PIO */
#define INTERRUPT_ON_READYBUSY		0x02				/* Interrupt on ReadyBusy PIO */
#define POOL_ON_STATUS			0x04				/* Pool on Status byte */

/* Sector zones */
#define SPARE_VALUE			0xFF

#define ZONE_DATA			0x01	/* Sector data zone */
#define ZONE_INFO			0x02	/* Sector info zone */

/* Nand flash chip status codes */
#define STATUS_READY                (0x01<<6)	/* Status code for Ready */
#define STATUS_ERROR                (0x01<<0)	/* Status code for Error */

/* Nand flash commands */
#define CMD_READ_1			0x00
#define CMD_READ_2			0x30

#define CMD_READID			0x90

#define CMD_WRITE_1			0x80
#define CMD_WRITE_2			0x10

#define CMD_ERASE_1			0x60
#define CMD_ERASE_2			0xD0

#define CMD_STATUS			0x70
#define CMD_RESET			0xFF

/* Nand flash commands (small blocks) */
#define CMD_READ_A			0x00
#define CMD_READ_C			0x50

#define CMD_WRITE_A			0x00
#define CMD_WRITE_C			0x50

#define NAND_BUS_WIDTH_8BITS		0x0
#define NAND_BUS_WIDTH_16BITS		0x1

/* NandFlash functions */
extern void nandflash_hw_init(void);
extern void nandflash_cfg_16bits_dbw_init(void);
extern int load_nandflash(unsigned int img_addr, unsigned int img_size, unsigned int img_dest);
extern BOOL AT91F_NandEraseBlock0(void);
#endif