/* *  drivers/mtd/nand/toto.c * *  Copyright (c) 2003 Texas Instruments * *  Derived from drivers/mtd/autcpu12.c * *  Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de> * * 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 *   TI fido board. It supports 32MiB and 64MiB cards * * $Id: toto.c,v 1.5 2005/11/07 11:14:31 gleixner Exp $ */#include <linux/slab.h>#include <linux/init.h>#include <linux/module.h>#include <linux/delay.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>#include <asm/sizes.h>#include <asm/arch/toto.h>#include <asm/arch-omap1510/hardware.h>#include <asm/arch/gpio.h>/* * MTD structure for TOTO board */static struct mtd_info *toto_mtd = NULL;static unsigned long toto_io_base = OMAP_FLASH_1_BASE;#define CONFIG_NAND_WORKAROUND 1#define NAND_NCE 0x4000#define NAND_CLE 0x1000#define NAND_ALE 0x0002#define NAND_MASK (NAND_CLE | NAND_ALE | NAND_NCE)#define T_NAND_CTL_CLRALE(iob)  gpiosetout(NAND_ALE, 0)#define T_NAND_CTL_SETALE(iob)  gpiosetout(NAND_ALE, NAND_ALE)#ifdef CONFIG_NAND_WORKAROUND     /* "some" dev boards busted, blue wired to rts2 :( */#define T_NAND_CTL_CLRCLE(iob)  gpiosetout(NAND_CLE, 0); rts2setout(2, 2)#define T_NAND_CTL_SETCLE(iob)  gpiosetout(NAND_CLE, NAND_CLE); rts2setout(2, 0)#else#define T_NAND_CTL_CLRCLE(iob)  gpiosetout(NAND_CLE, 0)#define T_NAND_CTL_SETCLE(iob)  gpiosetout(NAND_CLE, NAND_CLE)#endif#define T_NAND_CTL_SETNCE(iob)  gpiosetout(NAND_NCE, 0)#define T_NAND_CTL_CLRNCE(iob)  gpiosetout(NAND_NCE, NAND_NCE)/* * Define partitions for flash devices */static struct mtd_partition partition_info64M[] = {	{ .name =	"toto kernel partition 1",	  .offset =	0,	  .size	=	2 * SZ_1M },	{ .name =	"toto file sys partition 2",	  .offset =	2 * SZ_1M,	  .size =	14 * SZ_1M },	{ .name =	"toto user partition 3",	  .offset =	16 * SZ_1M,	  .size =	16 * SZ_1M },	{ .name =	"toto devboard extra partition 4",	  .offset =	32 * SZ_1M,	  .size =	32 * SZ_1M },};static struct mtd_partition partition_info32M[] = {	{ .name =	"toto kernel partition 1",	  .offset =	0,	  .size =	2 * SZ_1M },	{ .name =	"toto file sys partition 2",	  .offset =	2 * SZ_1M,	  .size =	14 * SZ_1M },	{ .name =	"toto user partition 3",	  .offset =	16 * SZ_1M,	  .size =	16 * SZ_1M },};#define NUM_PARTITIONS32M 3#define NUM_PARTITIONS64M 4/* *	hardware specific access to control-lines*/static void toto_hwcontrol(struct mtd_info *mtd, int cmd){	udelay(1); /* hopefully enough time for tc make proceding write to clear */	switch(cmd){		case NAND_CTL_SETCLE: T_NAND_CTL_SETCLE(cmd); break;		case NAND_CTL_CLRCLE: T_NAND_CTL_CLRCLE(cmd); break;		case NAND_CTL_SETALE: T_NAND_CTL_SETALE(cmd); break;		case NAND_CTL_CLRALE: T_NAND_CTL_CLRALE(cmd); break;		case NAND_CTL_SETNCE: T_NAND_CTL_SETNCE(cmd); break;		case NAND_CTL_CLRNCE: T_NAND_CTL_CLRNCE(cmd); break;	}	udelay(1); /* allow time to ensure gpio state to over take memory write */}/* * Main initialization routine */int __init toto_init (void){	struct nand_chip *this;	int err = 0;	/* Allocate memory for MTD device structure and private data */	toto_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),				GFP_KERNEL);	if (!toto_mtd) {		printk (KERN_WARNING "Unable to allocate toto NAND MTD device structure.\n");		err = -ENOMEM;		goto out;	}	/* Get pointer to private data */	this = (struct nand_chip *) (&toto_mtd[1]);	/* Initialize structures */	memset((char *) toto_mtd, 0, sizeof(struct mtd_info));	memset((char *) this, 0, sizeof(struct nand_chip));	/* Link the private data with the MTD structure */	toto_mtd->priv = this;	/* Set address of NAND IO lines */	this->IO_ADDR_R = toto_io_base;	this->IO_ADDR_W = toto_io_base;	this->hwcontrol = toto_hwcontrol;	this->dev_ready = NULL;	/* 25 us command delay time */	this->chip_delay = 30;	this->eccmode = NAND_ECC_SOFT;        /* Scan to find existance of the device */	if (nand_scan (toto_mtd, 1)) {		err = -ENXIO;		goto out_mtd;	}	/* Register the partitions */	switch(toto_mtd->size){		case SZ_64M: add_mtd_partitions(toto_mtd, partition_info64M, NUM_PARTITIONS64M); break;		case SZ_32M: add_mtd_partitions(toto_mtd, partition_info32M, NUM_PARTITIONS32M); break;		default: {			printk (KERN_WARNING "Unsupported Nand device\n");			err = -ENXIO;			goto out_buf;		}	}    	gpioreserve(NAND_MASK);  /* claim our gpios */    	archflashwp(0,0);	 /* open up flash for writing */	goto out;out_buf:	kfree (this->data_buf);out_mtd:	kfree (toto_mtd);out:	return err;}module_init(toto_init);/* * Clean up routine */static void __exit toto_cleanup (void){	/* Release resources, unregister device */	nand_release (toto_mtd);	/* Free the MTD device structure */	kfree (toto_mtd);	/* stop flash writes */	 archflashwp(0,1);	/* release gpios to system */	 gpiorelease(NAND_MASK);}module_exit(toto_cleanup);MODULE_LICENSE("GPL");MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>");MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");