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/*
* drivers/mtd/nand/spia.c
*
* Copyright (C) 2000 Steven J. Hill (sjhill@cotw.com)
*
* $Id: spia.c,v 1.12 2001/10/02 15:05:14 dwmw2 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
* SPIA board which utilizes the Toshiba TC58V64AFT part. This is
* a 64Mibit (8MiB x 8 bits) NAND flash device.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
/*
* MTD structure for SPIA board
*/
static struct mtd_info *spia_mtd = NULL;
/*
* Values specific to the SPIA board (used with EP7212 processor)
*/
#define SPIA_IO_ADDR = 0xd0000000 /* Start of EP7212 IO address space */
#define SPIA_FIO_ADDR = 0xf0000000 /* Address where flash is mapped */
#define SPIA_PEDR = 0x0080 /*
* IO offset to Port E data register
* where the CLE, ALE and NCE pins
* are wired to.
*/
#define SPIA_PEDDR = 0x00c0 /*
* IO offset to Port E data direction
* register so we can control the IO
* lines.
*/
/*
* Module stuff
*/
static int spia_io_base = SPIA_IO_BASE;
static int spia_fio_base = SPIA_FIO_BASE;
static int spia_pedr = SPIA_PEDR;
static int spia_peddr = SPIA_PEDDR;
MODULE_PARM(spia_io_base, "i");
MODULE_PARM(spia_fio_base, "i");
MODULE_PARM(spia_pedr, "i");
MODULE_PARM(spia_peddr, "i");
__setup("spia_io_base=",spia_io_base);
__setup("spia_fio_base=",spia_fio_base);
__setup("spia_pedr=",spia_pedr);
__setup("spia_peddr=",spia_peddr);
/*
* Define partitions for flash device
*/
const static struct mtd_partition partition_info[] = {
{ name: "SPIA flash partition 1",
offset: 0,
size: 2*1024*1024 },
{ name: "SPIA flash partition 2",
offset: 2*1024*1024,
size: 6*1024*1024 }
};
#define NUM_PARTITIONS 2
/*
* Main initialization routine
*/
int __init spia_init (void)
{
struct nand_chip *this;
/* Allocate memory for MTD device structure and private data */
spia_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
GFP_KERNEL);
if (!spia_mtd) {
printk ("Unable to allocate SPIA NAND MTD device structure.\n");
return -ENOMEM;
}
/* Get pointer to private data */
this = (struct nand_chip *) (&spia_mtd[1]);
/* Initialize structures */
memset((char *) spia_mtd, 0, sizeof(struct mtd_info));
memset((char *) this, 0, sizeof(struct nand_chip));
/* Link the private data with the MTD structure */
spia_mtd->priv = this;
/*
* Set GPIO Port E control register so that the pins are configured
* to be outputs for controlling the NAND flash.
*/
(*(volatile unsigned char *) (spia_io_base + spia_peddr)) = 0x07;
/* Set address of NAND IO lines */
this->IO_ADDR = spia_fio_base;
this->CTRL_ADDR = spia_io_base + spia_pedr;
this->CLE = 0x01;
this->ALE = 0x02;
this->NCE = 0x04;
/* Scan to find existence of the device */
if (nand_scan (spia_mtd)) {
kfree (spia_mtd);
return -ENXIO;
}
/* Allocate memory for internal data buffer */
this->data_buf = kmalloc (sizeof(u_char) * (spia_mtd->oobblock + spia_mtd->oobsize), GFP_KERNEL);
if (!this->data_buf) {
printk ("Unable to allocate NAND data buffer for SPIA.\n");
kfree (spia_mtd);
return -ENOMEM;
}
/* Register the partitions */
add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS);
/* Return happy */
return 0;
}
module_init(spia_init);
/*
* Clean up routine
*/
#ifdef MODULE
static void __exit spia_cleanup (void)
{
struct nand_chip *this = (struct nand_chip *) &spia_mtd[1];
/* Unregister the device */
del_mtd_device (spia_mtd);
/* Free internal data buffer */
kfree (this->data_buf);
/* Free the MTD device structure */
kfree (spia_mtd);
}
module_exit(spia_cleanup);
#endif
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steven J. Hill <sjhill@cotw.com");
MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");
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