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/*
* drivers/mtd/nand/spia.c
*
* Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
*
*
* 10-29-2001 TG change to support hardwarespecific access
* to controllines (due to change in nand.c)
* page_cache added
*
* $Id: spia.c,v 1.25 2005/11/07 11:14:31 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
* SPIA board which utilizes the Toshiba TC58V64AFT part. This is
* a 64Mibit (8MiB x 8 bits) NAND flash device.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#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_BASE 0xd0000000 /* Start of EP7212 IO address space */
#define SPIA_FIO_BASE 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_param(spia_io_base, int, 0);
module_param(spia_fio_base, int, 0);
module_param(spia_pedr, int, 0);
module_param(spia_peddr, int, 0);
/*
* Define partitions for flash device
*/
static const 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
/*
* hardware specific access to control-lines
*/
static void spia_hwcontrol(struct mtd_info *mtd, int cmd)
{
switch (cmd) {
case NAND_CTL_SETCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x01; break;
case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x01; break;
case NAND_CTL_SETALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x02; break;
case NAND_CTL_CLRALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x02; break;
case NAND_CTL_SETNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x04; break;
case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x04; break;
}
}
/*
* 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(spia_mtd, 0, sizeof(struct mtd_info));
memset(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_R = (void __iomem *)spia_fio_base;
this->IO_ADDR_W = (void __iomem *)spia_fio_base;
/* Set address of hardware control function */
this->hwcontrol = spia_hwcontrol;
/* 15 us command delay time */
this->chip_delay = 15;
/* Scan to find existence of the device */
if (nand_scan(spia_mtd, 1)) {
kfree(spia_mtd);
return -ENXIO;
}
/* 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)
{
/* Release resources, unregister device */
nand_release(spia_mtd);
/* Free the MTD device structure */
kfree(spia_mtd);
}
module_exit(spia_cleanup);
#endif
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com");
MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");
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