225 lines
6.1 KiB
C
225 lines
6.1 KiB
C
/*
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* drivers/mtd/autcpu12.c
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*
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* Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>
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*
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* Derived from drivers/mtd/spia.c
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* Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
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*
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* $Id: autcpu12.c,v 1.23 2005/11/07 11:14:30 gleixner Exp $
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Overview:
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* This is a device driver for the NAND flash device found on the
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* autronix autcpu12 board, which is a SmartMediaCard. It supports
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* 16MiB, 32MiB and 64MiB cards.
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*
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*
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* 02-12-2002 TG Cleanup of module params
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*
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* 02-20-2002 TG adjusted for different rd/wr adress support
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* added support for read device ready/busy line
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* added page_cache
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*
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* 10-06-2002 TG 128K card support added
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*/
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <asm/arch/hardware.h>
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#include <asm/sizes.h>
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#include <asm/arch/autcpu12.h>
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/*
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* MTD structure for AUTCPU12 board
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*/
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static struct mtd_info *autcpu12_mtd = NULL;
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static int autcpu12_io_base = CS89712_VIRT_BASE;
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static int autcpu12_fio_pbase = AUTCPU12_PHYS_SMC;
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static int autcpu12_fio_ctrl = AUTCPU12_SMC_SELECT_OFFSET;
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static int autcpu12_pedr = AUTCPU12_SMC_PORT_OFFSET;
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static void __iomem * autcpu12_fio_base;
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/*
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* Define partitions for flash devices
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*/
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static struct mtd_partition partition_info16k[] = {
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{ .name = "AUTCPU12 flash partition 1",
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.offset = 0,
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.size = 8 * SZ_1M },
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{ .name = "AUTCPU12 flash partition 2",
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.offset = 8 * SZ_1M,
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.size = 8 * SZ_1M },
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};
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static struct mtd_partition partition_info32k[] = {
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{ .name = "AUTCPU12 flash partition 1",
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.offset = 0,
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.size = 8 * SZ_1M },
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{ .name = "AUTCPU12 flash partition 2",
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.offset = 8 * SZ_1M,
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.size = 24 * SZ_1M },
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};
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static struct mtd_partition partition_info64k[] = {
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{ .name = "AUTCPU12 flash partition 1",
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.offset = 0,
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.size = 16 * SZ_1M },
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{ .name = "AUTCPU12 flash partition 2",
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.offset = 16 * SZ_1M,
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.size = 48 * SZ_1M },
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};
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static struct mtd_partition partition_info128k[] = {
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{ .name = "AUTCPU12 flash partition 1",
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.offset = 0,
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.size = 16 * SZ_1M },
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{ .name = "AUTCPU12 flash partition 2",
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.offset = 16 * SZ_1M,
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.size = 112 * SZ_1M },
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};
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#define NUM_PARTITIONS16K 2
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#define NUM_PARTITIONS32K 2
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#define NUM_PARTITIONS64K 2
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#define NUM_PARTITIONS128K 2
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/*
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* hardware specific access to control-lines
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*/
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static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd)
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{
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switch(cmd){
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case NAND_CTL_SETCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |= AUTCPU12_SMC_CLE; break;
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case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_CLE; break;
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case NAND_CTL_SETALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |= AUTCPU12_SMC_ALE; break;
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case NAND_CTL_CLRALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_ALE; break;
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case NAND_CTL_SETNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x01; break;
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case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x00; break;
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}
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}
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/*
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* read device ready pin
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*/
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int autcpu12_device_ready(struct mtd_info *mtd)
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{
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return ( (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) & AUTCPU12_SMC_RDY) ? 1 : 0;
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}
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/*
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* Main initialization routine
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*/
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int __init autcpu12_init (void)
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{
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struct nand_chip *this;
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int err = 0;
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/* Allocate memory for MTD device structure and private data */
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autcpu12_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
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GFP_KERNEL);
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if (!autcpu12_mtd) {
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printk ("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
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err = -ENOMEM;
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goto out;
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}
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/* map physical adress */
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autcpu12_fio_base = ioremap(autcpu12_fio_pbase,SZ_1K);
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if(!autcpu12_fio_base){
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printk("Ioremap autcpu12 SmartMedia Card failed\n");
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err = -EIO;
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goto out_mtd;
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}
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/* Get pointer to private data */
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this = (struct nand_chip *) (&autcpu12_mtd[1]);
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/* Initialize structures */
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memset((char *) autcpu12_mtd, 0, sizeof(struct mtd_info));
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memset((char *) this, 0, sizeof(struct nand_chip));
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/* Link the private data with the MTD structure */
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autcpu12_mtd->priv = this;
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/* Set address of NAND IO lines */
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this->IO_ADDR_R = autcpu12_fio_base;
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this->IO_ADDR_W = autcpu12_fio_base;
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this->hwcontrol = autcpu12_hwcontrol;
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this->dev_ready = autcpu12_device_ready;
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/* 20 us command delay time */
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this->chip_delay = 20;
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this->eccmode = NAND_ECC_SOFT;
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/* Enable the following for a flash based bad block table */
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/*
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this->options = NAND_USE_FLASH_BBT;
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*/
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this->options = NAND_USE_FLASH_BBT;
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/* Scan to find existance of the device */
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if (nand_scan (autcpu12_mtd, 1)) {
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err = -ENXIO;
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goto out_ior;
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}
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/* Register the partitions */
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switch(autcpu12_mtd->size){
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case SZ_16M: add_mtd_partitions(autcpu12_mtd, partition_info16k, NUM_PARTITIONS16K); break;
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case SZ_32M: add_mtd_partitions(autcpu12_mtd, partition_info32k, NUM_PARTITIONS32K); break;
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case SZ_64M: add_mtd_partitions(autcpu12_mtd, partition_info64k, NUM_PARTITIONS64K); break;
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case SZ_128M: add_mtd_partitions(autcpu12_mtd, partition_info128k, NUM_PARTITIONS128K); break;
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default: {
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printk ("Unsupported SmartMedia device\n");
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err = -ENXIO;
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goto out_ior;
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}
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}
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goto out;
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out_ior:
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iounmap((void *)autcpu12_fio_base);
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out_mtd:
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kfree (autcpu12_mtd);
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out:
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return err;
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}
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module_init(autcpu12_init);
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/*
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* Clean up routine
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*/
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#ifdef MODULE
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static void __exit autcpu12_cleanup (void)
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{
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/* Release resources, unregister device */
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nand_release (autcpu12_mtd);
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/* unmap physical adress */
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iounmap((void *)autcpu12_fio_base);
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/* Free the MTD device structure */
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kfree (autcpu12_mtd);
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}
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module_exit(autcpu12_cleanup);
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#endif
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
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MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");
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