209 lines
4.8 KiB
C
209 lines
4.8 KiB
C
/*
|
|
* drivers/mtd/nand/ts7250.c
|
|
*
|
|
* Copyright (C) 2004 Technologic Systems (support@embeddedARM.com)
|
|
*
|
|
* Derived from drivers/mtd/nand/edb7312.c
|
|
* Copyright (C) 2004 Marius Gröger (mag@sysgo.de)
|
|
*
|
|
* Derived from drivers/mtd/nand/autcpu12.c
|
|
* Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
|
|
*
|
|
* $Id: ts7250.c,v 1.4 2004/12/30 22:02:07 joff 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
|
|
* TS-7250 board which utilizes a Samsung 32 Mbyte part.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.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/mach-types.h>
|
|
|
|
/*
|
|
* MTD structure for TS7250 board
|
|
*/
|
|
static struct mtd_info *ts7250_mtd = NULL;
|
|
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
static const char *part_probes[] = { "cmdlinepart", NULL };
|
|
|
|
#define NUM_PARTITIONS 3
|
|
|
|
/*
|
|
* Define static partitions for flash device
|
|
*/
|
|
static struct mtd_partition partition_info32[] = {
|
|
{
|
|
.name = "TS-BOOTROM",
|
|
.offset = 0x00000000,
|
|
.size = 0x00004000,
|
|
}, {
|
|
.name = "Linux",
|
|
.offset = 0x00004000,
|
|
.size = 0x01d00000,
|
|
}, {
|
|
.name = "RedBoot",
|
|
.offset = 0x01d04000,
|
|
.size = 0x002fc000,
|
|
},
|
|
};
|
|
|
|
/*
|
|
* Define static partitions for flash device
|
|
*/
|
|
static struct mtd_partition partition_info128[] = {
|
|
{
|
|
.name = "TS-BOOTROM",
|
|
.offset = 0x00000000,
|
|
.size = 0x00004000,
|
|
}, {
|
|
.name = "Linux",
|
|
.offset = 0x00004000,
|
|
.size = 0x07d00000,
|
|
}, {
|
|
.name = "RedBoot",
|
|
.offset = 0x07d04000,
|
|
.size = 0x002fc000,
|
|
},
|
|
};
|
|
#endif
|
|
|
|
|
|
/*
|
|
* hardware specific access to control-lines
|
|
*/
|
|
static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd)
|
|
{
|
|
unsigned long ctrl = TS72XX_NAND_CONTROL_VIRT_BASE;
|
|
|
|
switch (cmd) {
|
|
case NAND_CTL_SETCLE:
|
|
__raw_writeb(__raw_readb(ctrl) | 0x2, ctrl);
|
|
break;
|
|
case NAND_CTL_CLRCLE:
|
|
__raw_writeb(__raw_readb(ctrl) & ~0x2, ctrl);
|
|
break;
|
|
case NAND_CTL_SETALE:
|
|
__raw_writeb(__raw_readb(ctrl) | 0x1, ctrl);
|
|
break;
|
|
case NAND_CTL_CLRALE:
|
|
__raw_writeb(__raw_readb(ctrl) & ~0x1, ctrl);
|
|
break;
|
|
case NAND_CTL_SETNCE:
|
|
__raw_writeb(__raw_readb(ctrl) | 0x4, ctrl);
|
|
break;
|
|
case NAND_CTL_CLRNCE:
|
|
__raw_writeb(__raw_readb(ctrl) & ~0x4, ctrl);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* read device ready pin
|
|
*/
|
|
static int ts7250_device_ready(struct mtd_info *mtd)
|
|
{
|
|
return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
|
|
}
|
|
|
|
/*
|
|
* Main initialization routine
|
|
*/
|
|
static int __init ts7250_init(void)
|
|
{
|
|
struct nand_chip *this;
|
|
const char *part_type = 0;
|
|
int mtd_parts_nb = 0;
|
|
struct mtd_partition *mtd_parts = 0;
|
|
|
|
if (!machine_is_ts72xx() || board_is_ts7200())
|
|
return -ENXIO;
|
|
|
|
/* Allocate memory for MTD device structure and private data */
|
|
ts7250_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
|
|
if (!ts7250_mtd) {
|
|
printk("Unable to allocate TS7250 NAND MTD device structure.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Get pointer to private data */
|
|
this = (struct nand_chip *)(&ts7250_mtd[1]);
|
|
|
|
/* Initialize structures */
|
|
memset(ts7250_mtd, 0, sizeof(struct mtd_info));
|
|
memset(this, 0, sizeof(struct nand_chip));
|
|
|
|
/* Link the private data with the MTD structure */
|
|
ts7250_mtd->priv = this;
|
|
ts7250_mtd->owner = THIS_MODULE;
|
|
|
|
/* insert callbacks */
|
|
this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
|
|
this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
|
|
this->hwcontrol = ts7250_hwcontrol;
|
|
this->dev_ready = ts7250_device_ready;
|
|
this->chip_delay = 15;
|
|
this->eccmode = NAND_ECC_SOFT;
|
|
|
|
printk("Searching for NAND flash...\n");
|
|
/* Scan to find existence of the device */
|
|
if (nand_scan(ts7250_mtd, 1)) {
|
|
kfree(ts7250_mtd);
|
|
return -ENXIO;
|
|
}
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
ts7250_mtd->name = "ts7250-nand";
|
|
mtd_parts_nb = parse_mtd_partitions(ts7250_mtd, part_probes, &mtd_parts, 0);
|
|
if (mtd_parts_nb > 0)
|
|
part_type = "command line";
|
|
else
|
|
mtd_parts_nb = 0;
|
|
#endif
|
|
if (mtd_parts_nb == 0) {
|
|
mtd_parts = partition_info32;
|
|
if (ts7250_mtd->size >= (128 * 0x100000))
|
|
mtd_parts = partition_info128;
|
|
mtd_parts_nb = NUM_PARTITIONS;
|
|
part_type = "static";
|
|
}
|
|
|
|
/* Register the partitions */
|
|
printk(KERN_NOTICE "Using %s partition definition\n", part_type);
|
|
add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);
|
|
|
|
/* Return happy */
|
|
return 0;
|
|
}
|
|
|
|
module_init(ts7250_init);
|
|
|
|
/*
|
|
* Clean up routine
|
|
*/
|
|
static void __exit ts7250_cleanup(void)
|
|
{
|
|
/* Unregister the device */
|
|
del_mtd_device(ts7250_mtd);
|
|
|
|
/* Free the MTD device structure */
|
|
kfree(ts7250_mtd);
|
|
}
|
|
|
|
module_exit(ts7250_cleanup);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");
|
|
MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");
|