[deliverable/linux.git] / drivers / mtd / nand / ts7250.c

/*
 * drivers/mtd/nand/ts7250.c
 *
 * Copyright (C) 2004 Technologic Systems (support@embeddedARM.com)
 *
 * Derived from drivers/mtd/nand/edb7312.c
 *   Copyright (C) 2004 Marius Gröger (mag@sysgo.de)
 *
 * Derived from drivers/mtd/nand/autcpu12.c
 *   Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
 *
 * $Id: ts7250.c,v 1.4 2004/12/30 22:02:07 joff 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
 *   TS-7250 board which utilizes a Samsung 32 Mbyte part.
 */

#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>
#include <asm/sizes.h>
#include <asm/mach-types.h>

/*
 * MTD structure for TS7250 board
 */
static struct mtd_info *ts7250_mtd = NULL;

#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probes[] = { "cmdlinepart", NULL };

#define NUM_PARTITIONS 3

/*
 * Define static partitions for flash device
 */
static struct mtd_partition partition_info32[] = {
	{
		.name		= "TS-BOOTROM",
		.offset		= 0x00000000,
		.size		= 0x00004000,
	}, {
		.name		= "Linux",
		.offset		= 0x00004000,
		.size		= 0x01d00000,
	}, {
		.name		= "RedBoot",
		.offset		= 0x01d04000,
		.size		= 0x002fc000,
	},
};

/*
 * Define static partitions for flash device
 */
static struct mtd_partition partition_info128[] = {
	{
		.name		= "TS-BOOTROM",
		.offset		= 0x00000000,
		.size		= 0x00004000,
	}, {
		.name		= "Linux",
		.offset		= 0x00004000,
		.size		= 0x07d00000,
	}, {
		.name		= "RedBoot",
		.offset		= 0x07d04000,
		.size		= 0x002fc000,
	},
};
#endif


/*
 *	hardware specific access to control-lines
 */
static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd)
{
	unsigned long ctrl = TS72XX_NAND_CONTROL_VIRT_BASE;

	switch (cmd) {
	case NAND_CTL_SETCLE:
		__raw_writeb(__raw_readb(ctrl) | 0x2, ctrl);
		break;
	case NAND_CTL_CLRCLE:
		__raw_writeb(__raw_readb(ctrl) & ~0x2, ctrl);
		break;
	case NAND_CTL_SETALE:
		__raw_writeb(__raw_readb(ctrl) | 0x1, ctrl);
		break;
	case NAND_CTL_CLRALE:
		__raw_writeb(__raw_readb(ctrl) & ~0x1, ctrl);
		break;
	case NAND_CTL_SETNCE:
		__raw_writeb(__raw_readb(ctrl) | 0x4, ctrl);
		break;
	case NAND_CTL_CLRNCE:
		__raw_writeb(__raw_readb(ctrl) & ~0x4, ctrl);
		break;
	}
}

/*
 *	read device ready pin
 */
static int ts7250_device_ready(struct mtd_info *mtd)
{
	return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
}

/*
 * Main initialization routine
 */
static int __init ts7250_init(void)
{
	struct nand_chip *this;
	const char *part_type = 0;
	int mtd_parts_nb = 0;
	struct mtd_partition *mtd_parts = 0;

	if (!machine_is_ts72xx() || board_is_ts7200())
		return -ENXIO;

	/* Allocate memory for MTD device structure and private data */
	ts7250_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
	if (!ts7250_mtd) {
		printk("Unable to allocate TS7250 NAND MTD device structure.\n");
		return -ENOMEM;
	}

	/* Get pointer to private data */
	this = (struct nand_chip *)(&ts7250_mtd[1]);

	/* Initialize structures */
	memset(ts7250_mtd, 0, sizeof(struct mtd_info));
	memset(this, 0, sizeof(struct nand_chip));

	/* Link the private data with the MTD structure */
	ts7250_mtd->priv = this;
	ts7250_mtd->owner = THIS_MODULE;

	/* insert callbacks */
	this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
	this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
	this->hwcontrol = ts7250_hwcontrol;
	this->dev_ready = ts7250_device_ready;
	this->chip_delay = 15;
	this->ecc.mode = NAND_ECC_SOFT;

	printk("Searching for NAND flash...\n");
	/* Scan to find existence of the device */
	if (nand_scan(ts7250_mtd, 1)) {
		kfree(ts7250_mtd);
		return -ENXIO;
	}
#ifdef CONFIG_MTD_PARTITIONS
	ts7250_mtd->name = "ts7250-nand";
	mtd_parts_nb = parse_mtd_partitions(ts7250_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_info32;
		if (ts7250_mtd->size >= (128 * 0x100000))
			mtd_parts = partition_info128;
		mtd_parts_nb = NUM_PARTITIONS;
		part_type = "static";
	}

	/* Register the partitions */
	printk(KERN_NOTICE "Using %s partition definition\n", part_type);
	add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);

	/* Return happy */
	return 0;
}

module_init(ts7250_init);

/*
 * Clean up routine
 */
static void __exit ts7250_cleanup(void)
{
	/* Unregister the device */
	del_mtd_device(ts7250_mtd);

	/* Free the MTD device structure */
	kfree(ts7250_mtd);
}

module_exit(ts7250_cleanup);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");
MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");
Commit	Line	Data
7d532dd5 LB	1	/*
	2	* drivers/mtd/nand/ts7250.c
	3	*
	4	* Copyright (C) 2004 Technologic Systems (support@embeddedARM.com)
	5	*
	6	* Derived from drivers/mtd/nand/edb7312.c
151e7659	7	* Copyright (C) 2004 Marius Gröger (mag@sysgo.de)
7d532dd5 LB	8	*
	9	* Derived from drivers/mtd/nand/autcpu12.c
	10	* Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
	11	*
	12	* $Id: ts7250.c,v 1.4 2004/12/30 22:02:07 joff Exp $
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License version 2 as
	16	* published by the Free Software Foundation.
	17	*
	18	* Overview:
	19	* This is a device driver for the NAND flash device found on the
	20	* TS-7250 board which utilizes a Samsung 32 Mbyte part.
	21	*/
	22
	23	#include <linux/slab.h>
	24	#include <linux/module.h>
	25	#include <linux/init.h>
	26	#include <linux/mtd/mtd.h>
	27	#include <linux/mtd/nand.h>
	28	#include <linux/mtd/partitions.h>
	29	#include <asm/io.h>
	30	#include <asm/arch/hardware.h>
	31	#include <asm/sizes.h>
	32	#include <asm/mach-types.h>
	33
	34	/*
	35	* MTD structure for TS7250 board
	36	*/
	37	static struct mtd_info *ts7250_mtd = NULL;
	38
	39	#ifdef CONFIG_MTD_PARTITIONS
	40	static const char *part_probes[] = { "cmdlinepart", NULL };
	41
	42	#define NUM_PARTITIONS 3
	43
	44	/*
	45	* Define static partitions for flash device
	46	*/
	47	static struct mtd_partition partition_info32[] = {
	48	{
	49	.name = "TS-BOOTROM",
	50	.offset = 0x00000000,
	51	.size = 0x00004000,
	52	}, {
	53	.name = "Linux",
	54	.offset = 0x00004000,
	55	.size = 0x01d00000,
	56	}, {
	57	.name = "RedBoot",
	58	.offset = 0x01d04000,
	59	.size = 0x002fc000,
	60	},
	61	};
	62
	63	/*
	64	* Define static partitions for flash device
	65	*/
	66	static struct mtd_partition partition_info128[] = {
	67	{
	68	.name = "TS-BOOTROM",
	69	.offset = 0x00000000,
	70	.size = 0x00004000,
	71	}, {
72	.name = "Linux",
73	.offset = 0x00004000,
74	.size = 0x07d00000,
75	}, {
76	.name = "RedBoot",
77	.offset = 0x07d04000,
78	.size = 0x002fc000,
79	},
80	};
81	#endif
82
83
84	/*
85	* hardware specific access to control-lines
86	*/
87	static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd)
88	{
89	unsigned long ctrl = TS72XX_NAND_CONTROL_VIRT_BASE;
90
e0c7d767	91	switch (cmd) {
7d532dd5 LB	92	case NAND_CTL_SETCLE:
	93	__raw_writeb(__raw_readb(ctrl) \| 0x2, ctrl);
	94	break;
	95	case NAND_CTL_CLRCLE:
	96	__raw_writeb(__raw_readb(ctrl) & ~0x2, ctrl);
	97	break;
	98	case NAND_CTL_SETALE:
	99	__raw_writeb(__raw_readb(ctrl) \| 0x1, ctrl);
	100	break;
	101	case NAND_CTL_CLRALE:
	102	__raw_writeb(__raw_readb(ctrl) & ~0x1, ctrl);
	103	break;
	104	case NAND_CTL_SETNCE:
	105	__raw_writeb(__raw_readb(ctrl) \| 0x4, ctrl);
	106	break;
	107	case NAND_CTL_CLRNCE:
	108	__raw_writeb(__raw_readb(ctrl) & ~0x4, ctrl);
	109	break;
	110	}
	111	}
	112
	113	/*
	114	* read device ready pin
	115	*/
	116	static int ts7250_device_ready(struct mtd_info *mtd)
	117	{
	118	return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
	119	}
	120
	121	/*
	122	* Main initialization routine
	123	*/
	124	static int __init ts7250_init(void)
	125	{
	126	struct nand_chip *this;
	127	const char *part_type = 0;
	128	int mtd_parts_nb = 0;
	129	struct mtd_partition *mtd_parts = 0;
	130
	131	if (!machine_is_ts72xx() \|\| board_is_ts7200())
	132	return -ENXIO;
	133
	134	/* Allocate memory for MTD device structure and private data */
e0c7d767	135	ts7250_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
7d532dd5 LB	136	if (!ts7250_mtd) {
	137	printk("Unable to allocate TS7250 NAND MTD device structure.\n");
	138	return -ENOMEM;
	139	}
	140
	141	/* Get pointer to private data */
	142	this = (struct nand_chip *)(&ts7250_mtd[1]);
	143
	144	/* Initialize structures */
	145	memset(ts7250_mtd, 0, sizeof(struct mtd_info));
	146	memset(this, 0, sizeof(struct nand_chip));
	147
	148	/* Link the private data with the MTD structure */
	149	ts7250_mtd->priv = this;
552d9205	150	ts7250_mtd->owner = THIS_MODULE;
7d532dd5 LB	151
	152	/* insert callbacks */
	153	this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
	154	this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
	155	this->hwcontrol = ts7250_hwcontrol;
	156	this->dev_ready = ts7250_device_ready;
	157	this->chip_delay = 15;
6dfc6d25	158	this->ecc.mode = NAND_ECC_SOFT;
7d532dd5 LB	159
	160	printk("Searching for NAND flash...\n");
	161	/* Scan to find existence of the device */
	162	if (nand_scan(ts7250_mtd, 1)) {
	163	kfree(ts7250_mtd);
	164	return -ENXIO;
	165	}
7d532dd5 LB	166	#ifdef CONFIG_MTD_PARTITIONS
7d532dd5 LB	167	ts7250_mtd->name = "ts7250-nand";
e0c7d767	168	mtd_parts_nb = parse_mtd_partitions(ts7250_mtd, part_probes, &mtd_parts, 0);
7d532dd5 LB	169	if (mtd_parts_nb > 0)
	170	part_type = "command line";
	171	else
	172	mtd_parts_nb = 0;
	173	#endif
	174	if (mtd_parts_nb == 0) {
	175	mtd_parts = partition_info32;
	176	if (ts7250_mtd->size >= (128 * 0x100000))
	177	mtd_parts = partition_info128;
	178	mtd_parts_nb = NUM_PARTITIONS;
	179	part_type = "static";
	180	}
	181
	182	/* Register the partitions */
	183	printk(KERN_NOTICE "Using %s partition definition\n", part_type);
	184	add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);
	185
	186	/* Return happy */
	187	return 0;
	188	}
e0c7d767	189
7d532dd5 LB	190	module_init(ts7250_init);
	191
	192	/*
	193	* Clean up routine
	194	*/
	195	static void __exit ts7250_cleanup(void)
	196	{
	197	/* Unregister the device */
	198	del_mtd_device(ts7250_mtd);
	199
	200	/* Free the MTD device structure */
	201	kfree(ts7250_mtd);
	202	}
e0c7d767	203
7d532dd5 LB	204	module_exit(ts7250_cleanup);
	205
	206	MODULE_LICENSE("GPL");
	207	MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");
	208	MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");