210 lines
5.3 KiB
C
210 lines
5.3 KiB
C
/*
|
|
* 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 1.5 2005/11/07 11:14:31 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
|
|
*/
|
|
static 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(toto_mtd, 0, sizeof(struct mtd_info));
|
|
memset(this, 0, sizeof(struct nand_chip));
|
|
|
|
/* Link the private data with the MTD structure */
|
|
toto_mtd->priv = this;
|
|
toto_mtd->owner = THIS_MODULE;
|
|
|
|
/* 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->ecc.mode = 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");
|