flash.h

嵌入式linux下ARM4210板的bootloader

#ifndef __FLASH_H
#define __FLASH_H

#define MAX_CHIPS             6

#define DEVICE_TYPE_X8	(8 / 8)
#define DEVICE_TYPE_X16	(16 / 8)
#define DEVICE_TYPE_X32	(32 / 8)

/* Addresses */
#define ADDR_MANUFACTURER		0x0000
#define ADDR_DEVICE_ID			0x0001
#define ADDR_SECTOR_LOCK		0x0002
#define ADDR_HANDSHAKE			0x0003
#define ADDR_UNLOCK_1			0x5555
#define ADDR_UNLOCK_2			0x2AAA

/* Commands */
#define CMD_UNLOCK_DATA_1		0x00AA
#define CMD_UNLOCK_DATA_2		0x0055
#define CMD_MANUFACTURER_UNLOCK_DATA	0x0090
#define CMD_UNLOCK_BYPASS_MODE		0x0020
#define CMD_PROGRAM_UNLOCK_DATA		0x00A0
#define CMD_RESET_DATA			0x00F0
#define CMD_SECTOR_ERASE_UNLOCK_DATA	0x0080
#define CMD_SECTOR_ERASE_UNLOCK_DATA_2	0x0030

#define CMD_UNLOCK_SECTOR		0x0060

/* Manufacturers */
/* SST */
#define MANUFACTURER_SST                0x00BF
#define SST39VF040                      0x00D7
#define SST39VF080                      0x00D8
#define SST39VF016                      0x00D9

#define D6_MASK	                        0x40
#define NOCACHE_BIT                     0x04000000


struct flchip {
	unsigned long start; /* Offset within the map */
	unsigned long size;
	unsigned long erasesize;
};

struct mtd_info {
	unsigned long offset; /* Offset within the memory */
	int buswidth; /* in octets */
	unsigned long size;   /* Total size of the MTD */
	unsigned long erasesize;
	int numchips;	
	struct flchip chips[MAX_CHIPS];
};

struct flash_info {
	const unsigned short mfr_id;
	const unsigned short dev_id;
	const char *name;
	const unsigned long size;
	const unsigned long erasesize;
};


int flash_init(void);
int flash_read(unsigned long from,
	unsigned long len, unsigned long *retlen, unsigned char *buf);
int flash_write(unsigned long to,
	unsigned long len, unsigned long *retlen, const unsigned char *buf);
int flash_erase(unsigned long adr, unsigned long size);


#endif /* __FLASH_H */