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/*
* linux/include/linux/mtd/nand.h
*
* Copyright (c) 2000 David Woodhouse <dwmw2@mvhi.com>
* Steven J. Hill <sjhill@cotw.com>
*
* $Id: nand.h,v 1.8 2000/10/30 17:16:17 sjhill Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Info:
* Contains standard defines and IDs for NAND flash devices
*
* Changelog:
* 01-31-2000 DMW Created
* 09-18-2000 SJH Moved structure out of the Disk-On-Chip drivers
* so it can be used by other NAND flash device
* drivers. I also changed the copyright since none
* of the original contents of this file are specific
* to DoC devices. David can whack me with a baseball
* bat later if I did something naughty.
* 10-11-2000 SJH Added private NAND flash structure for driver
* 10-24-2000 SJH Added prototype for 'nand_scan' function
*/
#ifndef __LINUX_MTD_NAND_H
#define __LINUX_MTD_NAND_H
#include <linux/config.h>
#include <linux/sched.h>
/*
* Searches for a NAND device
*/
extern int nand_scan (struct mtd_info *mtd);
/*
* Standard NAND flash commands
*/
#define NAND_CMD_READ0 0
#define NAND_CMD_READ1 1
#define NAND_CMD_PAGEPROG 0x10
#define NAND_CMD_READOOB 0x50
#define NAND_CMD_ERASE1 0x60
#define NAND_CMD_STATUS 0x70
#define NAND_CMD_SEQIN 0x80
#define NAND_CMD_READID 0x90
#define NAND_CMD_ERASE2 0xd0
#define NAND_CMD_RESET 0xff
/*
* Enumeration for NAND flash chip state
*/
typedef enum {
FL_READY,
FL_READING,
FL_WRITING,
FL_ERASING,
FL_SYNCING
} nand_state_t;
/*
* NAND Private Flash Chip Data
*
* Structure overview:
*
* IO_ADDR - address to access the 8 I/O lines to the flash device
*
* CTRL_ADDR - address where ALE, CLE and CE control bits are accessed
*
* CLE - location in control word for Command Latch Enable bit
*
* ALE - location in control word for Address Latch Enable bit
*
* NCE - location in control word for nChip Enable bit
*
* chip_lock - spinlock used to protect access to this structure
*
* wq - wait queue to sleep on if a NAND operation is in progress
*
* state - give the current state of the NAND device
*
* page_shift - number of address bits in a page (column address bits)
*
* data_buf - data buffer passed to/from MTD user modules
*
* ecc_code_buf - used only for holding calculated or read ECCs for
* a page read or written when ECC is in use
*
* reserved - padding to make structure fall on word boundary if
* when ECC is in use
*/
struct nand_chip {
unsigned long IO_ADDR;
unsigned long CTRL_ADDR;
unsigned int CLE;
unsigned int ALE;
unsigned int NCE;
spinlock_t chip_lock;
wait_queue_head_t wq;
nand_state_t state;
int page_shift;
u_char *data_buf;
#ifdef CONFIG_MTD_NAND_ECC
u_char ecc_code_buf[6];
u_char reserved[2];
#endif
};
/*
* NAND Flash Manufacturer ID Codes
*/
#define NAND_MFR_TOSHIBA 0x98
#define NAND_MFR_SAMSUNG 0xec
/*
* NAND Flash Device ID Structure
*
* Structure overview:
*
* name - Complete name of device
*
* manufacture_id - manufacturer ID code of device.
*
* model_id - model ID code of device.
*
* chipshift - total number of address bits for the device which
* is used to calculate address offsets and the total
* number of bytes the device is capable of.
*
* page256 - denotes if flash device has 256 byte pages or not.
*
* pageadrlen - number of bytes minus one needed to hold the
* complete address into the flash array. Keep in
* mind that when a read or write is done to a
* specific address, the address is input serially
* 8 bits at a time. This structure member is used
* by the read/write routines as a loop index for
* shifting the address out 8 bits at a time.
*
* erasesize - size of an erase block in the flash device.
*/
struct nand_flash_dev {
char * name;
int manufacture_id;
int model_id;
int chipshift;
char page256;
char pageadrlen;
unsigned long erasesize;
};
#endif /* __LINUX_MTD_NAND_H */
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