/*
* drivers/mtd/autcpu12.c
*
* Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>
*
* Derived from drivers/mtd/spia.c
* Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
*
* 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
* autronix autcpu12 board, which is a SmartMediaCard. It supports
* 16MiB, 32MiB and 64MiB cards.
*
*
* 02-12-2002 TG Cleanup of module params
*
* 02-20-2002 TG adjusted for different rd/wr address support
* added support for read device ready/busy line
* added page_cache
*
* 10-06-2002 TG 128K card support added
*/
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <mach/hardware.h>
#include <asm/sizes.h>
#include <mach/autcpu12.h>
/*
* MTD structure for AUTCPU12 board
*/
static struct mtd_info *autcpu12_mtd = NULL;
static void __iomem *autcpu12_fio_base;
/*
* Define partitions for flash devices
*/
static struct mtd_partition partition_info16k[] = {
{ .name = "AUTCPU12 flash partition 1",
.offset = 0,
.size = 8 * SZ_1M },
{ .name = "AUTCPU12 flash partition 2",
.offset = 8 * SZ_1M,
.size = 8 * SZ_1M },
};
static struct mtd_partition partition_info32k[] = {
{ .name = "AUTCPU12 flash partition 1",
.offset = 0,
.size = 8 * SZ_1M },
{ .name = "AUTCPU12 flash partition 2",
.offset = 8 * SZ_1M,
.size = 24 * SZ_1M },
};
static struct mtd_partition partition_info64k[] = {
{ .name = "AUTCPU12 flash partition 1",
.offset = 0,
.size = 16 * SZ_1M },
{ .name = "AUTCPU12 flash partition 2",
.offset = 16 * SZ_1M,
.size = 48 * SZ_1M },
};
static struct mtd_partition partition_info128k[] = {
{ .name = "AUTCPU12 flash partition 1",
.offset = 0,
.size = 16 * SZ_1M },
{ .name = "AUTCPU12 flash partition 2",
.offset = 16 * SZ_1M,
.size = 112 * SZ_1M },
};
#define NUM_PARTITIONS16K 2
#define NUM_PARTITIONS32K 2
#define NUM_PARTITIONS64K 2
#define NUM_PARTITIONS128K 2
/*
* hardware specific access to control-lines
*
* ALE bit 4 autcpu12_pedr
* CLE bit 5 autcpu12_pedr
* NCE bit 0 fio_ctrl
*
*/
static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd,
unsigned int ctrl)
{
struct nand_chip *chip = mtd->priv;
if (ctrl & NAND_CTRL_CHANGE) {
void __iomem *addr;
unsigned char bits;
addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;
bits = (ctrl & NAND_CLE) << 4;
bits |= (ctrl & NAND_ALE) << 2;
writeb((readb(addr) & ~0x30) | bits, addr);
addr = autcpu12_fio_base + AUTCPU12_SMC_SELECT_OFFSET;
writeb((readb(addr) & ~0x1) | (ctrl & NAND_NCE), addr);
}
if (cmd != NAND_CMD_NONE)
writeb(cmd, chip->IO_ADDR_W);
}
/*
* read device ready pin
*/
int autcpu12_device_ready(struct mtd_info *mtd)
{
void __iomem *addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;
return readb(addr) & AUTCPU12_SMC_RDY;
}
/*
* Main initialization routine
*/
static int __init autcpu12_init(void)
{
struct nand_chip *this;
int err = 0;
/* Allocate memory for MTD device structure and private data */
autcpu12_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),
GFP_KERNEL);
if (!autcpu12_mtd) {
printk("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
err = -ENOMEM;
goto out;
}
/* map physical address */
autcpu12_fio_base = ioremap(AUTCPU12_PHYS_SMC, SZ_1K);
if (!autcpu12_fio_base) {
printk("Ioremap autcpu12 SmartMedia Card failed\n");
err = -EIO;
goto out_mtd;
}
/* Get pointer to private data */
this = (struct nand_chip *)(&autcpu12_mtd[1]);
/* Initialize structures */
memset(autcpu12_mtd, 0, sizeof(struct mtd_info));
memset(this, 0, sizeof(struct nand_chip));
/* Link the private data with the MTD structure */
autcpu12_mtd->priv = this;
autcpu12_mtd->owner = THIS_MODULE;
/* Set address of NAND IO lines */
this->IO_ADDR_R = autcpu12_fio_base;
this->IO_ADDR_W = autcpu12_fio_base;
this->cmd_ctrl = autcpu12_hwcontrol;
this->dev_ready = autcpu12_device_ready;
/* 20 us command delay time */
this->chip_delay = 20;
this->ecc.mode = NAND_ECC_SOFT;
/* Enable the following for a flash based bad block table */
/*
this->options = NAND_USE_FLASH_BBT;
*/
this->options = NAND_USE_FLASH_BBT;
/* Scan to find existance of the device */
if (nand_scan(autcpu12_mtd, 1)) {
err = -ENXIO;
goto out_ior;
}
/* Register the partitions */
switch (autcpu12_mtd->size) {
case SZ_16M:
add_mtd_partitions(autcpu12_mtd, partition_info16k,
NUM_PARTITIONS16K);
break;
case SZ_32M:
add_mtd_partitions(autcpu12_mtd, partition_info32k,
NUM_PARTITIONS32K);
break;
case SZ_64M:
add_mtd_partitions(autcpu12_mtd, partition_info64k,
NUM_PARTITIONS64K);
break;
case SZ_128M:
add_mtd_partitions(autcpu12_mtd, partition_info128k,
NUM_PARTITIONS128K);
break;
default:
printk("Unsupported SmartMedia device\n");
err = -ENXIO;
goto out_ior;
}
goto out;
out_ior:
iounmap(autcpu12_fio_base);
out_mtd:
kfree(autcpu12_mtd);
out:
return err;
}
module_init(autcpu12_init);
/*
* Clean up routine
*/
static void __exit autcpu12_cleanup(void)
{
/* Release resources, unregister device */
nand_release(autcpu12_mtd);
/* unmap physical address */
iounmap(autcpu12_fio_base);
/* Free the MTD device structure */
kfree(autcpu12_mtd);
}
module_exit(autcpu12_cleanup);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");
