/*
* drivers/mtd/autcpu12.c
*
* Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>
*
* Derived from drivers/mtd/spia.c
* Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
*
* $Id: autcpu12.c,v 1.23 2005/11/07 11:14:30 gleixner 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.
*
* Overview:
* This is a device driver for the NAND flash device found on the
* autronix autcpu12 board, which is a SmartMediaCard. It supports
* 16MiB, 32MiB and 64MiB cards.
*
*
* 02-12-2002 TG Cleanup of module params
*
* 02-20-2002 TG adjusted for different rd/wr adress support
* added support for read device ready/busy line
* added page_cache
*
* 10-06-2002 TG 128K card support added
*/
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>
#include <asm/sizes.h>
#include <asm/arch/autcpu12.h>
/*
* MTD structure for AUTCPU12 board
*/
static struct mtd_info *autcpu12_mtd = NULL;
static int autcpu12_io_base = CS89712_VIRT_BASE;
static int autcpu12_fio_pbase = AUTCPU12_PHYS_SMC;
static int autcpu12_fio_ctrl = AUTCPU12_SMC_SELECT_OFFSET;
static int autcpu12_pedr = AUTCPU12_SMC_PORT_OFFSET;
static void __iomem *autcpu12_fio_base;
/*
* Define partitions for flash devices
*/
static struct mtd_partition partition_info16k[] = {
{ .name = "AUTCPU12 flash partition 1",
.offset = 0,
.size = 8 * SZ_1M },
{ .name = "AUTCPU12 flash partition 2",
.offset = 8 * SZ_1M,
.size = 8 * SZ_1M },
};
static struct mtd_partition partition_info32k[] = {
{ .name = "AUTCPU12 flash partition 1",
.offset = 0,
.size = 8 * SZ_1M },
{ .name = "AUTCPU12 flash partition 2",
.offset = 8 * SZ_1M,
.size = 24 * SZ_1M },
};
static struct mtd_partition partition_info64k[] = {
{ .name = "AUTCPU12 flash partition 1",
.offset = 0,
.size = 16 * SZ_1M },
{ .name = "AUTCPU12 flash partition 2",
.offset = 16 * SZ_1M,
.size = 48 * SZ_1M },
};
static struct mtd_partition partition_info128k[] = {
{ .name = "AUTCPU12 flash partition 1",
.offset = 0,
.size = 16 * SZ_1M },
{ .name = "AUTCPU12 flash partition 2",
.offset = 16 * SZ_1M,
.size = 112 * SZ_1M },
};
#define NUM_PARTITIONS16K 2
#define NUM_PARTITIONS32K 2
#define NUM_PARTITIONS64K 2
#define NUM_PARTITIONS128K 2
/*
* hardware specific access to control-lines
*/
static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd)
{
switch (cmd) {
case NAND_CTL_SETCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |= AUTCPU12_SMC_CLE; break;
case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_CLE; break;
case NAND_CTL_SETALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |= AUTCPU12_SMC_ALE; break;
case NAND_CTL_CLRALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_ALE; break;
case NAND_CTL_SETNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x01; break;
case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x00; break;
}
}
/*
* read device ready pin
*/
int autcpu12_device_ready(struct mtd_info *mtd)
{
return ((*(volatile unsigned char *)(autcpu12_io_base + autcpu12_pedr)) & AUTCPU12_SMC_RDY) ? 1 : 0;
}
/*
* Main initialization routine
*/
static int __init autcpu12_init(void)
{
struct nand_chip *this;
int err = 0;
/* Allocate memory for MTD device structure and private data */
autcpu12_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
if (!autcpu12_mtd) {
printk("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
err = -ENOMEM;
goto out;
}
/* map physical adress */
autcpu12_fio_base = ioremap(autcpu12_fio_pbase, SZ_1K);
if (!autcpu12_fio_base) {
printk("Ioremap autcpu12 SmartMedia Card failed\n");
err = -EIO;
goto out_mtd;
}
/* Get pointer to private data */
this = (struct nand_chip *)(&autcpu12_mtd[1]);
/* Initialize structures */
memset(autcpu12_mtd, 0, sizeof(struct mtd_info));
memset(this, 0, sizeof(struct nand_chip));
/* Link the private data with the MTD structure */
autcpu12_mtd->priv = this;
autcpu12_mtd->owner = THIS_MODULE;
/* Set address of NAND IO lines */
this->IO_ADDR_R = autcpu12_fio_base;
this->IO_ADDR_W = autcpu12_fio_base;
this->hwcontrol = autcpu12_hwcontrol;
this->dev_ready = autcpu12_device_ready;
/* 20 us command delay time */
this->chip_delay = 20;
this->eccmode = NAND_ECC_SOFT;
/* Enable the following for a flash based bad block table */
/*
this->options = NAND_USE_FLASH_BBT;
*/
this->options = NAND_USE_FLASH_BBT;
/* Scan to find existance of the device */
if (nand_scan(autcpu12_mtd, 1)) {
err = -ENXIO;
goto out_ior;
}
/* Register the partitions */
switch (autcpu12_mtd->size) {
case SZ_16M: add_mtd_partitions(autcpu12_mtd, partition_info16k, NUM_PARTITIONS16K); break;
case SZ_32M: add_mtd_partitions(autcpu12_mtd, partition_info32k, NUM_PARTITIONS32K); break;
case SZ_64M: add_mtd_partitions(autcpu12_mtd, partition_info64k, NUM_PARTITIONS64K); break;
case SZ_128M: add_mtd_partitions(autcpu12_mtd, partition_info128k, NUM_PARTITIONS128K); break;
default:
printk("Unsupported SmartMedia device\n");
err = -ENXIO;
goto out_ior;
}
goto out;
out_ior:
iounmap((void *)autcpu12_fio_base);
out_mtd:
kfree(autcpu12_mtd);
out:
return err;
}
module_init(autcpu12_init);
/*
* Clean up routine
*/
static void __exit autcpu12_cleanup(void)
{
/* Release resources, unregister device */
nand_release(autcpu12_mtd);
/* unmap physical adress */
iounmap((void *)autcpu12_fio_base);
/* Free the MTD device structure */
kfree(autcpu12_mtd);
}
module_exit(autcpu12_cleanup);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");
