/* * drivers/mtd/nand/sharpsl.c * *  Copyright (C) 2004 Richard Purdie * *  $Id: sharpsl.c,v 1.4 2005/01/23 11:09:19 rpurdie Exp $ * *  Based on Sharp's NAND driver sharp_sl.c * * 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. * */#include <linux/genhd.h>#include <linux/slab.h>#include <linux/module.h>#include <linux/delay.h>#include <linux/mtd/mtd.h>#include <linux/mtd/nand.h>#include <linux/mtd/nand_ecc.h>#include <linux/mtd/partitions.h>#include <linux/interrupt.h>#include <asm/io.h>#include <asm/hardware.h>#include <asm/mach-types.h>static void __iomem *sharpsl_io_base;static int sharpsl_phys_base = 0x0C000000;/* register offset */#define ECCLPLB	 	sharpsl_io_base+0x00	/* line parity 7 - 0 bit */#define ECCLPUB	 	sharpsl_io_base+0x04	/* line parity 15 - 8 bit */#define ECCCP	   	sharpsl_io_base+0x08	/* column parity 5 - 0 bit */#define ECCCNTR	 	sharpsl_io_base+0x0C	/* ECC byte counter */#define ECCCLRR	 	sharpsl_io_base+0x10	/* cleare ECC */#define FLASHIO	 	sharpsl_io_base+0x14	/* Flash I/O */#define FLASHCTL	sharpsl_io_base+0x18	/* Flash Control *//* Flash control bit */#define FLRYBY		(1 << 5)#define FLCE1		(1 << 4)#define FLWP		(1 << 3)#define FLALE		(1 << 2)#define FLCLE		(1 << 1)#define FLCE0		(1 << 0)/* * MTD structure for SharpSL */static struct mtd_info *sharpsl_mtd = NULL;/* * Define partitions for flash device */#define DEFAULT_NUM_PARTITIONS 3static int nr_partitions;static struct mtd_partition sharpsl_nand_default_partition_info[] = {	{	.name = "System Area",	.offset = 0,	.size = 7 * 1024 * 1024,	},	{	.name = "Root Filesystem",	.offset = 7 * 1024 * 1024,	.size = 30 * 1024 * 1024,	},	{	.name = "Home Filesystem",	.offset = MTDPART_OFS_APPEND ,	.size = MTDPART_SIZ_FULL ,	},};/*  *	hardware specific access to control-lines */static voidsharpsl_nand_hwcontrol(struct mtd_info* mtd, int cmd){	switch (cmd) {	case NAND_CTL_SETCLE: 		writeb(readb(FLASHCTL) | FLCLE, FLASHCTL);		break;	case NAND_CTL_CLRCLE:		writeb(readb(FLASHCTL) & ~FLCLE, FLASHCTL);		break;	case NAND_CTL_SETALE:		writeb(readb(FLASHCTL) | FLALE, FLASHCTL);		break;	case NAND_CTL_CLRALE:		writeb(readb(FLASHCTL) & ~FLALE, FLASHCTL);		break;	case NAND_CTL_SETNCE: 		writeb(readb(FLASHCTL) & ~(FLCE0|FLCE1), FLASHCTL);		break;	case NAND_CTL_CLRNCE: 		writeb(readb(FLASHCTL) | (FLCE0|FLCE1), FLASHCTL);		break;	}}static uint8_t scan_ff_pattern[] = { 0xff, 0xff };static struct nand_bbt_descr sharpsl_bbt = {	.options = 0,	.offs = 4,	.len = 2,	.pattern = scan_ff_pattern};static intsharpsl_nand_dev_ready(struct mtd_info* mtd){	return !((readb(FLASHCTL) & FLRYBY) == 0);}static voidsharpsl_nand_enable_hwecc(struct mtd_info* mtd, int mode){	writeb(0 ,ECCCLRR);}static intsharpsl_nand_calculate_ecc(struct mtd_info* mtd, const u_char* dat,				u_char* ecc_code){	ecc_code[0] = ~readb(ECCLPUB);	ecc_code[1] = ~readb(ECCLPLB);	ecc_code[2] = (~readb(ECCCP) << 2) | 0x03;	return readb(ECCCNTR) != 0;}#ifdef CONFIG_MTD_PARTITIONSconst char *part_probes[] = { "cmdlinepart", NULL };#endif/* * Main initialization routine */int __initsharpsl_nand_init(void){	struct nand_chip *this;	struct mtd_partition* sharpsl_partition_info;	int err = 0;	/* Allocate memory for MTD device structure and private data */	sharpsl_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),				GFP_KERNEL);	if (!sharpsl_mtd) {		printk ("Unable to allocate SharpSL NAND MTD device structure.\n");		return -ENOMEM;	}		/* map physical adress */	sharpsl_io_base = ioremap(sharpsl_phys_base, 0x1000);	if(!sharpsl_io_base){		printk("ioremap to access Sharp SL NAND chip failed\n");		kfree(sharpsl_mtd);		return -EIO;	}		/* Get pointer to private data */	this = (struct nand_chip *) (&sharpsl_mtd[1]);	/* Initialize structures */	memset((char *) sharpsl_mtd, 0, sizeof(struct mtd_info));	memset((char *) this, 0, sizeof(struct nand_chip));	/* Link the private data with the MTD structure */	sharpsl_mtd->priv = this;	/*	 * PXA initialize	 */	writeb(readb(FLASHCTL) | FLWP, FLASHCTL);	/* Set address of NAND IO lines */	this->IO_ADDR_R = FLASHIO;	this->IO_ADDR_W = FLASHIO;	/* Set address of hardware control function */	this->hwcontrol = sharpsl_nand_hwcontrol;	this->dev_ready = sharpsl_nand_dev_ready;	/* 15 us command delay time */	this->chip_delay = 15;	/* set eccmode using hardware ECC */	this->eccmode = NAND_ECC_HW3_256;	this->enable_hwecc = sharpsl_nand_enable_hwecc;	this->calculate_ecc = sharpsl_nand_calculate_ecc;	this->correct_data = nand_correct_data;	this->badblock_pattern = &sharpsl_bbt;	/* Scan to find existence of the device */	err=nand_scan(sharpsl_mtd,1);	if (err) {		iounmap(sharpsl_io_base);		kfree(sharpsl_mtd);		return err;	}	/* Register the partitions */	sharpsl_mtd->name = "sharpsl-nand";	nr_partitions = parse_mtd_partitions(sharpsl_mtd, part_probes,						&sharpsl_partition_info, 0);						 	if (nr_partitions <= 0) {		nr_partitions = DEFAULT_NUM_PARTITIONS;		sharpsl_partition_info = sharpsl_nand_default_partition_info;		if (machine_is_poodle()) {			sharpsl_partition_info[1].size=30 * 1024 * 1024;		} else if (machine_is_corgi() || machine_is_shepherd()) {			sharpsl_partition_info[1].size=25 * 1024 * 1024;		} else if (machine_is_husky()) {			sharpsl_partition_info[1].size=53 * 1024 * 1024;		} 			}	if (machine_is_husky()) {		/* Need to use small eraseblock size for backward compatibility */		sharpsl_mtd->flags |= MTD_NO_VIRTBLOCKS;	}	add_mtd_partitions(sharpsl_mtd, sharpsl_partition_info, nr_partitions);	/* Return happy */	return 0;}module_init(sharpsl_nand_init);/* * Clean up routine */#ifdef MODULEstatic void __exit sharpsl_nand_cleanup(void){	struct nand_chip *this = (struct nand_chip *) &sharpsl_mtd[1];	/* Release resources, unregister device */	nand_release(sharpsl_mtd);	iounmap(sharpsl_io_base);	/* Free the MTD device structure */	kfree(sharpsl_mtd);}module_exit(sharpsl_nand_cleanup);#endifMODULE_LICENSE("GPL");MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");MODULE_DESCRIPTION("Device specific logic for NAND flash on Sharp SL-C7xx Series");