drivers/mtd/nand/sharpsl.c - maze/linux - Git at Google

 /*
  * drivers/mtd/nand/sharpsl.c
  *
  *  Copyright (C) 2004 Richard Purdie
  *
  *  $Id: sharpsl.c,v 1.7 2005/11/07 11:14:31 gleixner 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 3

 static 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
  *	ctrl:
  *	NAND_CNE: bit 0 -> bit 0 & 4
  *	NAND_CLE: bit 1 -> bit 1
  *	NAND_ALE: bit 2 -> bit 2
  *
  */
 static void sharpsl_nand_hwcontrol(struct mtd_info *mtd, int cmd,
 				   unsigned int ctrl)
 {
 	struct nand_chip *chip = mtd->priv;

 	if (ctrl & NAND_CTRL_CHANGE) {
 		unsigned char bits = ctrl & 0x07;

 		bits |= (ctrl & 0x01) << 4;
 		writeb((readb(FLASHCTL) & 0x17) | bits, FLASHCTL);
 	}

 	if (cmd != NAND_CMD_NONE)
 		writeb(cmd, chip->IO_ADDR_W);
 }

 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 struct nand_bbt_descr sharpsl_akita_bbt = {
 	.options = 0,
 	.offs = 4,
 	.len = 1,
 	.pattern = scan_ff_pattern
 };

 static struct nand_ecclayout akita_oobinfo = {
 	.eccbytes = 24,
 	.eccpos = {
 		   0x5, 0x1, 0x2, 0x3, 0x6, 0x7, 0x15, 0x11,
 		   0x12, 0x13, 0x16, 0x17, 0x25, 0x21, 0x22, 0x23,
 		   0x26, 0x27, 0x35, 0x31, 0x32, 0x33, 0x36, 0x37},
 	.oobfree = {{0x08, 0x09}}
 };

 static int sharpsl_nand_dev_ready(struct mtd_info *mtd)
 {
 	return !((readb(FLASHCTL) & FLRYBY) == 0);
 }

 static void sharpsl_nand_enable_hwecc(struct mtd_info *mtd, int mode)
 {
 	writeb(0, ECCCLRR);
 }

 static int sharpsl_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_PARTITIONS
 const char *part_probes[] = { "cmdlinepart", NULL };
 #endif

 /*
  * Main initialization routine
  */
 static int __init sharpsl_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(sharpsl_mtd, 0, sizeof(struct mtd_info));
 	memset(this, 0, sizeof(struct nand_chip));

 	/* Link the private data with the MTD structure */
 	sharpsl_mtd->priv = this;
 	sharpsl_mtd->owner = THIS_MODULE;

 	/*
 	 * 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->cmd_ctrl = 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->ecc.mode = NAND_ECC_HW;
 	this->ecc.size = 256;
 	this->ecc.bytes = 3;
 	this->badblock_pattern = &sharpsl_bbt;
 	if (machine_is_akita() || machine_is_borzoi()) {
 		this->badblock_pattern = &sharpsl_akita_bbt;
 		this->ecc.layout = &akita_oobinfo;
 	}
 	this->ecc.hwctl = sharpsl_nand_enable_hwecc;
 	this->ecc.calculate = sharpsl_nand_calculate_ecc;
 	this->ecc.correct = nand_correct_data;

 	/* 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 = 22 * 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;
 		} else if (machine_is_spitz()) {
 			sharpsl_partition_info[1].size = 5 * 1024 * 1024;
 		} else if (machine_is_akita()) {
 			sharpsl_partition_info[1].size = 58 * 1024 * 1024;
 		} else if (machine_is_borzoi()) {
 			sharpsl_partition_info[1].size = 32 * 1024 * 1024;
 		}
 	}

 	add_mtd_partitions(sharpsl_mtd, sharpsl_partition_info, nr_partitions);

 	/* Return happy */
 	return 0;
 }

 module_init(sharpsl_nand_init);

 /*
  * Clean up routine
  */
 static void __exit sharpsl_nand_cleanup(void)
 {
 	/* 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);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 MODULE_DESCRIPTION("Device specific logic for NAND flash on Sharp SL-C7xx Series");
	/*
	* drivers/mtd/nand/sharpsl.c
	*
	* Copyright (C) 2004 Richard Purdie
	*
	* $Id: sharpsl.c,v 1.7 2005/11/07 11:14:31 gleixner 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 3

	static 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
	* ctrl:
	* NAND_CNE: bit 0 -> bit 0 & 4
	* NAND_CLE: bit 1 -> bit 1
	* NAND_ALE: bit 2 -> bit 2
	*
	*/
	static void sharpsl_nand_hwcontrol(struct mtd_info *mtd, int cmd,
	unsigned int ctrl)
	{
	struct nand_chip *chip = mtd->priv;

	if (ctrl & NAND_CTRL_CHANGE) {
	unsigned char bits = ctrl & 0x07;

	bits \|= (ctrl & 0x01) << 4;
	writeb((readb(FLASHCTL) & 0x17) \| bits, FLASHCTL);
	}

	if (cmd != NAND_CMD_NONE)
	writeb(cmd, chip->IO_ADDR_W);
	}

	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 struct nand_bbt_descr sharpsl_akita_bbt = {
	.options = 0,
	.offs = 4,
	.len = 1,
	.pattern = scan_ff_pattern
	};

	static struct nand_ecclayout akita_oobinfo = {
	.eccbytes = 24,
	.eccpos = {
	0x5, 0x1, 0x2, 0x3, 0x6, 0x7, 0x15, 0x11,
	0x12, 0x13, 0x16, 0x17, 0x25, 0x21, 0x22, 0x23,
	0x26, 0x27, 0x35, 0x31, 0x32, 0x33, 0x36, 0x37},
	.oobfree = {{0x08, 0x09}}
	};

	static int sharpsl_nand_dev_ready(struct mtd_info *mtd)
	{
	return !((readb(FLASHCTL) & FLRYBY) == 0);
	}

	static void sharpsl_nand_enable_hwecc(struct mtd_info *mtd, int mode)
	{
	writeb(0, ECCCLRR);
	}

	static int sharpsl_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_PARTITIONS
	const char *part_probes[] = { "cmdlinepart", NULL };
	#endif

	/*
	* Main initialization routine
	*/
	static int __init sharpsl_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(sharpsl_mtd, 0, sizeof(struct mtd_info));
	memset(this, 0, sizeof(struct nand_chip));

	/* Link the private data with the MTD structure */
	sharpsl_mtd->priv = this;
	sharpsl_mtd->owner = THIS_MODULE;

	/*
	* 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->cmd_ctrl = 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->ecc.mode = NAND_ECC_HW;
	this->ecc.size = 256;
	this->ecc.bytes = 3;
	this->badblock_pattern = &sharpsl_bbt;
	if (machine_is_akita() \|\| machine_is_borzoi()) {
	this->badblock_pattern = &sharpsl_akita_bbt;
	this->ecc.layout = &akita_oobinfo;
	}
	this->ecc.hwctl = sharpsl_nand_enable_hwecc;
	this->ecc.calculate = sharpsl_nand_calculate_ecc;
	this->ecc.correct = nand_correct_data;

	/* 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 = 22 * 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;
	} else if (machine_is_spitz()) {
	sharpsl_partition_info[1].size = 5 * 1024 * 1024;
	} else if (machine_is_akita()) {
	sharpsl_partition_info[1].size = 58 * 1024 * 1024;
	} else if (machine_is_borzoi()) {
	sharpsl_partition_info[1].size = 32 * 1024 * 1024;
	}
	}

	add_mtd_partitions(sharpsl_mtd, sharpsl_partition_info, nr_partitions);

	/* Return happy */
	return 0;
	}

	module_init(sharpsl_nand_init);

	/*
	* Clean up routine
	*/
	static void __exit sharpsl_nand_cleanup(void)
	{
	/* 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);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
	MODULE_DESCRIPTION("Device specific logic for NAND flash on Sharp SL-C7xx Series");