/* *  drivers/mtd/nand/edb7312.c * *  Copyright (C) 2002 Marius Gr鰃er (mag@sysgo.de) * *  Derived from drivers/mtd/nand/autcpu12.c *       Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de) * * $Id: edb7312.c,v 1.12 2005/11/07 11:14:30 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 *   CLEP7312 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/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> /* for CLPS7111_VIRT_BASE */#include <asm/sizes.h>#include <asm/hardware/clps7111.h>/* * MTD structure for EDB7312 board */static struct mtd_info *ep7312_mtd = NULL;/* * Values specific to the EDB7312 board (used with EP7312 processor) */#define EP7312_FIO_PBASE 0x10000000	/* Phys address of flash */#define EP7312_PXDR	0x0001	/*				 * IO offset to Port B data register				 * where the CLE, ALE and NCE pins				 * are wired to.				 */#define EP7312_PXDDR	0x0041	/*				 * IO offset to Port B data direction				 * register so we can control the IO				 * lines.				 *//* * Module stuff */static unsigned long ep7312_fio_pbase = EP7312_FIO_PBASE;static void __iomem * ep7312_pxdr = (void __iomem *) EP7312_PXDR;static void __iomem * ep7312_pxddr = (void __iomem *) EP7312_PXDDR;#ifdef CONFIG_MTD_PARTITIONS/* * Define static partitions for flash device */static struct mtd_partition partition_info[] = {	{ .name = "EP7312 Nand Flash",		  .offset = 0,		  .size = 8*1024*1024 }};#define NUM_PARTITIONS 1#endif/* *	hardware specific access to control-lines */static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd){	switch(cmd) {	case NAND_CTL_SETCLE:		clps_writeb(clps_readb(ep7312_pxdr) | 0x10, ep7312_pxdr);		break;	case NAND_CTL_CLRCLE:		clps_writeb(clps_readb(ep7312_pxdr) & ~0x10, ep7312_pxdr);		break;	case NAND_CTL_SETALE:		clps_writeb(clps_readb(ep7312_pxdr) | 0x20, ep7312_pxdr);		break;	case NAND_CTL_CLRALE:		clps_writeb(clps_readb(ep7312_pxdr) & ~0x20, ep7312_pxdr);		break;	case NAND_CTL_SETNCE:		clps_writeb((clps_readb(ep7312_pxdr) | 0x80) & ~0x40, ep7312_pxdr);		break;	case NAND_CTL_CLRNCE:		clps_writeb((clps_readb(ep7312_pxdr) | 0x80) | 0x40, ep7312_pxdr);		break;	}}/* *	read device ready pin */static int ep7312_device_ready(struct mtd_info *mtd){	return 1;}#ifdef CONFIG_MTD_PARTITIONSconst char *part_probes[] = { "cmdlinepart", NULL };#endif/* * Main initialization routine */static int __init ep7312_init (void){	struct nand_chip *this;	const char *part_type = 0;	int mtd_parts_nb = 0;	struct mtd_partition *mtd_parts = 0;	void __iomem * ep7312_fio_base;	/* Allocate memory for MTD device structure and private data */	ep7312_mtd = kmalloc(sizeof(struct mtd_info) +			     sizeof(struct nand_chip),			     GFP_KERNEL);	if (!ep7312_mtd) {		printk("Unable to allocate EDB7312 NAND MTD device structure.\n");		return -ENOMEM;	}	/* map physical adress */	ep7312_fio_base = ioremap(ep7312_fio_pbase, SZ_1K);	if(!ep7312_fio_base) {		printk("ioremap EDB7312 NAND flash failed\n");		kfree(ep7312_mtd);		return -EIO;	}	/* Get pointer to private data */	this = (struct nand_chip *) (&ep7312_mtd[1]);	/* Initialize structures */	memset((char *) ep7312_mtd, 0, sizeof(struct mtd_info));	memset((char *) this, 0, sizeof(struct nand_chip));	/* Link the private data with the MTD structure */	ep7312_mtd->priv = this;	/*	 * Set GPIO Port B control register so that the pins are configured	 * to be outputs for controlling the NAND flash.	 */	clps_writeb(0xf0, ep7312_pxddr);	/* insert callbacks */	this->IO_ADDR_R = ep7312_fio_base;	this->IO_ADDR_W = ep7312_fio_base;	this->hwcontrol = ep7312_hwcontrol;	this->dev_ready = ep7312_device_ready;	/* 15 us command delay time */	this->chip_delay = 15;	/* Scan to find existence of the device */	if (nand_scan (ep7312_mtd, 1)) {		iounmap((void *)ep7312_fio_base);		kfree (ep7312_mtd);		return -ENXIO;	}#ifdef CONFIG_MTD_PARTITIONS	ep7312_mtd->name = "edb7312-nand";	mtd_parts_nb = parse_mtd_partitions(ep7312_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_info;		mtd_parts_nb = NUM_PARTITIONS;		part_type = "static";	}	/* Register the partitions */	printk(KERN_NOTICE "Using %s partition definition\n", part_type);	add_mtd_partitions(ep7312_mtd, mtd_parts, mtd_parts_nb);	/* Return happy */	return 0;}module_init(ep7312_init);/* * Clean up routine */static void __exit ep7312_cleanup (void){	struct nand_chip *this = (struct nand_chip *) &ep7312_mtd[1];	/* Release resources, unregister device */	nand_release (ap7312_mtd);	/* Free internal data buffer */	kfree (this->data_buf);	/* Free the MTD device structure */	kfree (ep7312_mtd);}module_exit(ep7312_cleanup);MODULE_LICENSE("GPL");MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");