/*
* drivers/mtd/nand/toto.c
*
* Copyright (c) 2003 Texas Instruments
*
* Derived from drivers/mtd/autcpu12.c
*
* Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>
*
* 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
* TI fido board. It supports 32MiB and 64MiB cards
*
* $Id: toto.c,v 1.4 2004/10/05 13:50:20 gleixner Exp $
*/
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.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/toto.h>
#include <asm/arch-omap1510/hardware.h>
#include <asm/arch/gpio.h>
/*
* MTD structure for TOTO board
*/
static struct mtd_info *toto_mtd = NULL;
static unsigned long toto_io_base = OMAP_FLASH_1_BASE;
#define CONFIG_NAND_WORKAROUND 1
#define NAND_NCE 0x4000
#define NAND_CLE 0x1000
#define NAND_ALE 0x0002
#define NAND_MASK (NAND_CLE | NAND_ALE | NAND_NCE)
#define T_NAND_CTL_CLRALE(iob) gpiosetout(NAND_ALE, 0)
#define T_NAND_CTL_SETALE(iob) gpiosetout(NAND_ALE, NAND_ALE)
#ifdef CONFIG_NAND_WORKAROUND /* "some" dev boards busted, blue wired to rts2 :( */
#define T_NAND_CTL_CLRCLE(iob) gpiosetout(NAND_CLE, 0); rts2setout(2, 2)
#define T_NAND_CTL_SETCLE(iob) gpiosetout(NAND_CLE, NAND_CLE); rts2setout(2, 0)
#else
#define T_NAND_CTL_CLRCLE(iob) gpiosetout(NAND_CLE, 0)
#define T_NAND_CTL_SETCLE(iob) gpiosetout(NAND_CLE, NAND_CLE)
#endif
#define T_NAND_CTL_SETNCE(iob) gpiosetout(NAND_NCE, 0)
#define T_NAND_CTL_CLRNCE(iob) gpiosetout(NAND_NCE, NAND_NCE)
/*
* Define partitions for flash devices
*/
static struct mtd_partition partition_info64M[] = {
{ .name = "toto kernel partition 1",
.offset = 0,
.size = 2 * SZ_1M },
{ .name = "toto file sys partition 2",
.offset = 2 * SZ_1M,
.size = 14 * SZ_1M },
{ .name = "toto user partition 3",
.offset = 16 * SZ_1M,
.size = 16 * SZ_1M },
{ .name = "toto devboard extra partition 4",
.offset = 32 * SZ_1M,
.size = 32 * SZ_1M },
};
static struct mtd_partition partition_info32M[] = {
{ .name = "toto kernel partition 1",
.offset = 0,
.size = 2 * SZ_1M },
{ .name = "toto file sys partition 2",
.offset = 2 * SZ_1M,
.size = 14 * SZ_1M },
{ .name = "toto user partition 3",
.offset = 16 * SZ_1M,
.size = 16 * SZ_1M },
};
#define NUM_PARTITIONS32M 3
#define NUM_PARTITIONS64M 4
/*
* hardware specific access to control-lines
*/
static void toto_hwcontrol(struct mtd_info *mtd, int cmd)
{
udelay(1); /* hopefully enough time for tc make proceding write to clear */
switch(cmd){
case NAND_CTL_SETCLE: T_NAND_CTL_SETCLE(cmd); break;
case NAND_CTL_CLRCLE: T_NAND_CTL_CLRCLE(cmd); break;
case NAND_CTL_SETALE: T_NAND_CTL_SETALE(cmd); break;
case NAND_CTL_CLRALE: T_NAND_CTL_CLRALE(cmd); break;
case NAND_CTL_SETNCE: T_NAND_CTL_SETNCE(cmd); break;
case NAND_CTL_CLRNCE: T_NAND_CTL_CLRNCE(cmd); break;
}
udelay(1); /* allow time to ensure gpio state to over take memory write */
}
/*
* Main initialization routine
*/
int __init toto_init (void)
{
struct nand_chip *this;
int err = 0;
/* Allocate memory for MTD device structure and private data */
toto_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
GFP_KERNEL);
if (!toto_mtd) {
printk (KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n");
err = -ENOMEM;
goto out;
}
/* Get pointer to private data */
this = (struct nand_chip *) (&toto_mtd[1]);
/* Initialize structures */
memset((char *) toto_mtd, 0, sizeof(struct mtd_info));
memset((char *) this, 0, sizeof(struct nand_chip));
/* Link the private data with the MTD structure */
toto_mtd->priv = this;
/* Set address of NAND IO lines */
this->IO_ADDR_R = toto_io_base;
this->IO_ADDR_W = toto_io_base;
this->hwcontrol = toto_hwcontrol;
this->dev_ready = NULL;
/* 25 us command delay time */
this->chip_delay = 30;
this->eccmode = NAND_ECC_SOFT;
/* Scan to find existance of the device */
if (nand_scan (toto_mtd, 1)) {
err = -ENXIO;
goto out_mtd;
}
/* Register the partitions */
switch(toto_mtd->size){
case SZ_64M: add_mtd_partitions(toto_mtd, partition_info64M, NUM_PARTITIONS64M); break;
case SZ_32M: add_mtd_partitions(toto_mtd, partition_info32M, NUM_PARTITIONS32M); break;
default: {
printk (KERN_WARNING "Unsupported Nand device\n");
err = -ENXIO;
goto out_buf;
}
}
gpioreserve(NAND_MASK); /* claim our gpios */
archflashwp(0,0); /* open up flash for writing */
goto out;
out_buf:
kfree (this->data_buf);
out_mtd:
kfree (toto_mtd);
out:
return err;
}
module_init(toto_init);
/*
* Clean up routine
*/
static void __exit toto_cleanup (void)
{
/* Release resources, unregister device */
nand_release (toto_mtd);
/* Free the MTD device structure */
kfree (toto_mtd);
/* stop flash writes */
archflashwp(0,1);
/* release gpios to system */
gpiorelease(NAND_MASK);
}
module_exit(toto_cleanup);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>");
MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");
