path: root/drivers/mtd/nand/nandsim.c

/*
 * NAND flash simulator.
 *
 * Author: Artem B. Bityuckiy <dedekind@oktetlabs.ru>, <dedekind@infradead.org>
 *
 * Copyright (C) 2004 Nokia Corporation
 *
 * Note: NS means "NAND Simulator".
 * Note: Input means input TO flash chip, output means output FROM chip.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
 *
 * $Id: nandsim.c,v 1.8 2005/03/19 15:33:56 dedekind Exp $
 */

#include <linux/config.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/delay.h>
#ifdef CONFIG_NS_ABS_POS
#include <asm/io.h>
#endif


/* Default simulator parameters values */
#if !defined(CONFIG_NANDSIM_FIRST_ID_BYTE)  || \
    !defined(CONFIG_NANDSIM_SECOND_ID_BYTE) || \
    !defined(CONFIG_NANDSIM_THIRD_ID_BYTE)  || \
    !defined(CONFIG_NANDSIM_FOURTH_ID_BYTE)
#define CONFIG_NANDSIM_FIRST_ID_BYTE  0x98
#define CONFIG_NANDSIM_SECOND_ID_BYTE 0x39
#define CONFIG_NANDSIM_THIRD_ID_BYTE  0xFF /* No byte */
#define CONFIG_NANDSIM_FOURTH_ID_BYTE 0xFF /* No byte */
#endif

#ifndef CONFIG_NANDSIM_ACCESS_DELAY
#define CONFIG_NANDSIM_ACCESS_DELAY 25
#endif
#ifndef CONFIG_NANDSIM_PROGRAMM_DELAY
#define CONFIG_NANDSIM_PROGRAMM_DELAY 200
#endif
#ifndef CONFIG_NANDSIM_ERASE_DELAY
#define CONFIG_NANDSIM_ERASE_DELAY 2
#endif
#ifndef CONFIG_NANDSIM_OUTPUT_CYCLE
#define CONFIG_NANDSIM_OUTPUT_CYCLE 40
#endif
#ifndef CONFIG_NANDSIM_INPUT_CYCLE
#define CONFIG_NANDSIM_INPUT_CYCLE  50
#endif
#ifndef CONFIG_NANDSIM_BUS_WIDTH
#define CONFIG_NANDSIM_BUS_WIDTH  8
#endif
#ifndef CONFIG_NANDSIM_DO_DELAYS
#define CONFIG_NANDSIM_DO_DELAYS  0
#endif
#ifndef CONFIG_NANDSIM_LOG
#define CONFIG_NANDSIM_LOG        0
#endif
#ifndef CONFIG_NANDSIM_DBG
#define CONFIG_NANDSIM_DBG        0
#endif

static uint first_id_byte  = CONFIG_NANDSIM_FIRST_ID_BYTE;
static uint second_id_byte = CONFIG_NANDSIM_SECOND_ID_BYTE;
static uint third_id_byte  = CONFIG_NANDSIM_THIRD_ID_BYTE;
static uint fourth_id_byte = CONFIG_NANDSIM_FOURTH_ID_BYTE;
static uint access_delay   = CONFIG_NANDSIM_ACCESS_DELAY;
static uint programm_delay = CONFIG_NANDSIM_PROGRAMM_DELAY;
static uint erase_delay    = CONFIG_NANDSIM_ERASE_DELAY;
static uint output_cycle   = CONFIG_NANDSIM_OUTPUT_CYCLE;
static uint input_cycle    = CONFIG_NANDSIM_INPUT_CYCLE;
static uint bus_width      = CONFIG_NANDSIM_BUS_WIDTH;
static uint do_delays      = CONFIG_NANDSIM_DO_DELAYS;
static uint log            = CONFIG_NANDSIM_LOG;
static uint dbg            = CONFIG_NANDSIM_DBG;

module_param(first_id_byte,  uint, 0400);
module_param(second_id_byte, uint, 0400);
module_param(third_id_byte,  uint, 0400);
module_param(fourth_id_byte, uint, 0400);
module_param(access_delay,   uint, 0400);
module_param(programm_delay, uint, 0400);
module_param(erase_delay,    uint, 0400);
module_param(output_cycle,   uint, 0400);
module_param(input_cycle,    uint, 0400);
module_param(bus_width,      uint, 0400);
module_param(do_delays,      uint, 0400);
module_param(log,            uint, 0400);
module_param(dbg,            uint, 0400);

MODULE_PARM_DESC(first_id_byte,  "The fist byte returned by NAND Flash 'read ID' command (manufaturer ID)");
MODULE_PARM_DESC(second_id_byte, "The second byte returned by NAND Flash 'read ID' command (chip ID)");
MODULE_PARM_DESC(third_id_byte,  "The third byte returned by NAND Flash 'read ID' command");
MODULE_PARM_DESC(fourth_id_byte, "The fourth byte returned by NAND Flash 'read ID' command");
MODULE_PARM_DESC(access_delay,   "Initial page access delay (microiseconds)");
MODULE_PARM_DESC(programm_delay, "Page programm delay (microseconds");
MODULE_PARM_D