[mirror_ubuntu-hirsute-kernel.git] / drivers / mtd / nand / cmx270_nand.c

/*
 *  linux/drivers/mtd/nand/cmx270-nand.c
 *
 *  Copyright (C) 2006 Compulab, Ltd.
 *  Mike Rapoport <mike@compulab.co.il>
 *
 *  Derived from drivers/mtd/nand/h1910.c
 *       Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
 *       Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.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
 *   CM-X270 board.
 */

#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/gpio.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach-types.h>

#include <mach/pxa2xx-regs.h>

#define GPIO_NAND_CS	(11)
#define GPIO_NAND_RB	(89)

/* MTD structure for CM-X270 board */
static struct mtd_info *cmx270_nand_mtd;

/* remaped IO address of the device */
static void __iomem *cmx270_nand_io;

/*
 * Define static partitions for flash device
 */
static struct mtd_partition partition_info[] = {
	[0] = {
		.name	= "cmx270-0",
		.offset	= 0,
		.size	= MTDPART_SIZ_FULL
	}
};
#define NUM_PARTITIONS (ARRAY_SIZE(partition_info))

const char *part_probes[] = { "cmdlinepart", NULL };

static u_char cmx270_read_byte(struct mtd_info *mtd)
{
	struct nand_chip *this = mtd->priv;

	return (readl(this->IO_ADDR_R) >> 16);
}

static void cmx270_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
{
	int i;
	struct nand_chip *this = mtd->priv;

	for (i=0; i<len; i++)
		writel((*buf++ << 16), this->IO_ADDR_W);
}

static void cmx270_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
	int i;
	struct nand_chip *this = mtd->priv;

	for (i=0; i<len; i++)
		*buf++ = readl(this->IO_ADDR_R) >> 16;
}

static int cmx270_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
{
	int i;
	struct nand_chip *this = mtd->priv;

	for (i=0; i<len; i++)
		if (buf[i] != (u_char)(readl(this->IO_ADDR_R) >> 16))
			return -EFAULT;

	return 0;
}

static inline void nand_cs_on(void)
{
	gpio_set_value(GPIO_NAND_CS, 0);
}

static void nand_cs_off(void)
{
	dsb();

	gpio_set_value(GPIO_NAND_CS, 1);
}

/*
 *	hardware specific access to control-lines
 */
static void cmx270_hwcontrol(struct mtd_info *mtd, int dat,
			     unsigned int ctrl)
{
	struct nand_chip* this = mtd->priv;
	unsigned int nandaddr = (unsigned int)this->IO_ADDR_W;

	dsb();

	if (ctrl & NAND_CTRL_CHANGE) {
		if ( ctrl & NAND_ALE )
			nandaddr |=  (1 << 3);
		else
			nandaddr &= ~(1 << 3);
		if ( ctrl & NAND_CLE )
			nandaddr |=  (1 << 2);
		else
			nandaddr &= ~(1 << 2);
		if ( ctrl & NAND_NCE )
			nand_cs_on();
		else
			nand_cs_off();
	}

	dsb();
	this->IO_ADDR_W = (void __iomem*)nandaddr;
	if (dat != NAND_CMD_NONE)
		writel((dat << 16), this->IO_ADDR_W);

	dsb();
}

/*
 *	read device ready pin
 */
static int cmx270_device_ready(struct mtd_info *mtd)
{
	dsb();

	return (gpio_get_value(GPIO_NAND_RB));
}

/*
 * Main initialization routine
 */
static int __init cmx270_init(void)
{
	struct nand_chip *this;
	const char *part_type;
	struct mtd_partition *mtd_parts;
	int mtd_parts_nb = 0;
	int ret;

	if (!(machine_is_armcore() && cpu_is_pxa27x()))
		return -ENODEV;

	ret = gpio_request(GPIO_NAND_CS, "NAND CS");
	if (ret) {
		pr_warning("CM-X270: failed to request NAND CS gpio\n");
		return ret;
	}

	gpio_direction_output(GPIO_NAND_CS, 1);

	ret = gpio_request(GPIO_NAND_RB, "NAND R/B");
	if (ret) {
		pr_warning("CM-X270: failed to request NAND R/B gpio\n");
		goto err_gpio_request;
	}

	gpio_direction_input(GPIO_NAND_RB);

	/* Allocate memory for MTD device structure and private data */
	cmx270_nand_mtd = kzalloc(sizeof(struct mtd_info) +
				  sizeof(struct nand_chip),
				  GFP_KERNEL);
	if (!cmx270_nand_mtd) {
		pr_debug("Unable to allocate CM-X270 NAND MTD device structure.\n");
		ret = -ENOMEM;
		goto err_kzalloc;
	}

	cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12);
	if (!cmx270_nand_io) {
		pr_debug("Unable to ioremap NAND device\n");
		ret = -EINVAL;
		goto err_ioremap;
	}

	/* Get pointer to private data */
	this = (struct nand_chip *)(&cmx270_nand_mtd[1]);

	/* Link the private data with the MTD structure */
	cmx270_nand_mtd->owner = THIS_MODULE;
	cmx270_nand_mtd->priv = this;

	/* insert callbacks */
	this->IO_ADDR_R = cmx270_nand_io;
	this->IO_ADDR_W = cmx270_nand_io;
	this->cmd_ctrl = cmx270_hwcontrol;
	this->dev_ready = cmx270_device_ready;

	/* 15 us command delay time */
	this->chip_delay = 20;
	this->ecc.mode = NAND_ECC_SOFT;

	/* read/write functions */
	this->read_byte = cmx270_read_byte;
	this->read_buf = cmx270_read_buf;
	this->write_buf = cmx270_write_buf;
	this->verify_buf = cmx270_verify_buf;

	/* Scan to find existence of the device */
	if (nand_scan (cmx270_nand_mtd, 1)) {
		pr_notice("No NAND device\n");
		ret = -ENXIO;
		goto err_scan;
	}

#ifdef CONFIG_MTD_CMDLINE_PARTS
	mtd_parts_nb = parse_mtd_partitions(cmx270_nand_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) {
		mtd_parts = partition_info;
		mtd_parts_nb = NUM_PARTITIONS;
		part_type = "static";
	}

	/* Register the partitions */
	pr_notice("Using %s partition definition\n", part_type);
	ret = add_mtd_partitions(cmx270_nand_mtd, mtd_parts, mtd_parts_nb);
	if (ret)
		goto err_scan;

	/* Return happy */
	return 0;

err_scan:
	iounmap(cmx270_nand_io);
err_ioremap:
	kfree(cmx270_nand_mtd);
err_kzalloc:
	gpio_free(GPIO_NAND_RB);
err_gpio_request:
	gpio_free(GPIO_NAND_CS);

	return ret;

}
module_init(cmx270_init);

/*
 * Clean up routine
 */
static void __exit cmx270_cleanup(void)
{
	/* Release resources, unregister device */
	nand_release(cmx270_nand_mtd);

	gpio_free(GPIO_NAND_RB);
	gpio_free(GPIO_NAND_CS);

	iounmap(cmx270_nand_io);

	/* Free the MTD device structure */
	kfree (cmx270_nand_mtd);
}
module_exit(cmx270_cleanup);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module");
Commit	Line	Data
54d33c4c MR	1	/*
	2	* linux/drivers/mtd/nand/cmx270-nand.c
	3	*
	4	* Copyright (C) 2006 Compulab, Ltd.
	5	* Mike Rapoport <mike@compulab.co.il>
	6	*
	7	* Derived from drivers/mtd/nand/h1910.c
	8	* Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
	9	* Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
	10	*
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License version 2 as
	14	* published by the Free Software Foundation.
	15	*
	16	* Overview:
	17	* This is a device driver for the NAND flash device found on the
	18	* CM-X270 board.
	19	*/
	20
	21	#include <linux/mtd/nand.h>
	22	#include <linux/mtd/partitions.h>
70eb33d6	23	#include <linux/gpio.h>
54d33c4c MR	24
	25	#include <asm/io.h>
	26	#include <asm/irq.h>
70eb33d6	27	#include <asm/mach-types.h>
54d33c4c	28
b74d1969	29	#include <mach/pxa2xx-regs.h>
54d33c4c MR	30
	31	#define GPIO_NAND_CS (11)
	32	#define GPIO_NAND_RB (89)
	33
54d33c4c MR	34	/* MTD structure for CM-X270 board */
	35	static struct mtd_info *cmx270_nand_mtd;
	36
	37	/* remaped IO address of the device */
	38	static void __iomem *cmx270_nand_io;
	39
	40	/*
	41	* Define static partitions for flash device
	42	*/
	43	static struct mtd_partition partition_info[] = {
	44	[0] = {
	45	.name = "cmx270-0",
	46	.offset = 0,
	47	.size = MTDPART_SIZ_FULL
	48	}
	49	};
	50	#define NUM_PARTITIONS (ARRAY_SIZE(partition_info))
	51
	52	const char *part_probes[] = { "cmdlinepart", NULL };
	53
	54	static u_char cmx270_read_byte(struct mtd_info *mtd)
	55	{
	56	struct nand_chip *this = mtd->priv;
	57
	58	return (readl(this->IO_ADDR_R) >> 16);
	59	}
	60
	61	static void cmx270_write_buf(struct mtd_info mtd, const u_char buf, int len)
	62	{
	63	int i;
	64	struct nand_chip *this = mtd->priv;
	65
	66	for (i=0; i<len; i++)
	67	writel((*buf++ << 16), this->IO_ADDR_W);
	68	}
	69
	70	static void cmx270_read_buf(struct mtd_info mtd, u_char buf, int len)
	71	{
	72	int i;
	73	struct nand_chip *this = mtd->priv;
	74
	75	for (i=0; i<len; i++)
	76	*buf++ = readl(this->IO_ADDR_R) >> 16;
	77	}
	78
	79	static int cmx270_verify_buf(struct mtd_info mtd, const u_char buf, int len)
	80	{
	81	int i;
	82	struct nand_chip *this = mtd->priv;
	83
	84	for (i=0; i<len; i++)
	85	if (buf[i] != (u_char)(readl(this->IO_ADDR_R) >> 16))
	86	return -EFAULT;
	87
	88	return 0;
	89	}
	90
	91	static inline void nand_cs_on(void)
	92	{
70eb33d6	93	gpio_set_value(GPIO_NAND_CS, 0);
54d33c4c MR	94	}
	95
	96	static void nand_cs_off(void)
	97	{
70eb33d6	98	dsb();
54d33c4c	99
70eb33d6	100	gpio_set_value(GPIO_NAND_CS, 1);
54d33c4c MR	101	}
	102
	103	/*
	104	* hardware specific access to control-lines
	105	*/
	106	static void cmx270_hwcontrol(struct mtd_info *mtd, int dat,
	107	unsigned int ctrl)
	108	{
	109	struct nand_chip* this = mtd->priv;
	110	unsigned int nandaddr = (unsigned int)this->IO_ADDR_W;
	111
70eb33d6	112	dsb();
54d33c4c MR	113
	114	if (ctrl & NAND_CTRL_CHANGE) {
	115	if ( ctrl & NAND_ALE )
	116	nandaddr \|= (1 << 3);
	117	else
	118	nandaddr &= ~(1 << 3);
	119	if ( ctrl & NAND_CLE )
	120	nandaddr \|= (1 << 2);
	121	else
	122	nandaddr &= ~(1 << 2);
	123	if ( ctrl & NAND_NCE )
	124	nand_cs_on();
	125	else
	126	nand_cs_off();
	127	}
	128
70eb33d6	129	dsb();
54d33c4c MR	130	this->IO_ADDR_W = (void __iomem*)nandaddr;
	131	if (dat != NAND_CMD_NONE)
	132	writel((dat << 16), this->IO_ADDR_W);
	133
70eb33d6	134	dsb();
54d33c4c MR	135	}
	136
	137	/*
	138	* read device ready pin
	139	*/
	140	static int cmx270_device_ready(struct mtd_info *mtd)
	141	{
70eb33d6	142	dsb();
54d33c4c	143
70eb33d6	144	return (gpio_get_value(GPIO_NAND_RB));
54d33c4c MR	145	}
	146
	147	/*
	148	* Main initialization routine
	149	*/
627df23c	150	static int __init cmx270_init(void)
54d33c4c MR	151	{
	152	struct nand_chip *this;
	153	const char *part_type;
	154	struct mtd_partition *mtd_parts;
	155	int mtd_parts_nb = 0;
	156	int ret;
	157
a7f3f030	158	if (!(machine_is_armcore() && cpu_is_pxa27x()))
70eb33d6 MR	159	return -ENODEV;
	160
	161	ret = gpio_request(GPIO_NAND_CS, "NAND CS");
	162	if (ret) {
	163	pr_warning("CM-X270: failed to request NAND CS gpio\n");
	164	return ret;
	165	}
	166
	167	gpio_direction_output(GPIO_NAND_CS, 1);
	168
	169	ret = gpio_request(GPIO_NAND_RB, "NAND R/B");
	170	if (ret) {
	171	pr_warning("CM-X270: failed to request NAND R/B gpio\n");
	172	goto err_gpio_request;
	173	}
	174
	175	gpio_direction_input(GPIO_NAND_RB);
	176
54d33c4c MR	177	/* Allocate memory for MTD device structure and private data */
	178	cmx270_nand_mtd = kzalloc(sizeof(struct mtd_info) +
	179	sizeof(struct nand_chip),
	180	GFP_KERNEL);
	181	if (!cmx270_nand_mtd) {
70eb33d6 MR	182	pr_debug("Unable to allocate CM-X270 NAND MTD device structure.\n");
	183	ret = -ENOMEM;
	184	goto err_kzalloc;
54d33c4c MR	185	}
	186
	187	cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12);
	188	if (!cmx270_nand_io) {
70eb33d6	189	pr_debug("Unable to ioremap NAND device\n");
54d33c4c	190	ret = -EINVAL;
70eb33d6	191	goto err_ioremap;
54d33c4c MR	192	}
	193
	194	/* Get pointer to private data */
	195	this = (struct nand_chip *)(&cmx270_nand_mtd[1]);
	196
	197	/* Link the private data with the MTD structure */
	198	cmx270_nand_mtd->owner = THIS_MODULE;
	199	cmx270_nand_mtd->priv = this;
	200
	201	/* insert callbacks */
	202	this->IO_ADDR_R = cmx270_nand_io;
	203	this->IO_ADDR_W = cmx270_nand_io;
	204	this->cmd_ctrl = cmx270_hwcontrol;
	205	this->dev_ready = cmx270_device_ready;
	206
	207	/* 15 us command delay time */
	208	this->chip_delay = 20;
	209	this->ecc.mode = NAND_ECC_SOFT;
	210
	211	/* read/write functions */
	212	this->read_byte = cmx270_read_byte;
	213	this->read_buf = cmx270_read_buf;
	214	this->write_buf = cmx270_write_buf;
	215	this->verify_buf = cmx270_verify_buf;
	216
	217	/* Scan to find existence of the device */
	218	if (nand_scan (cmx270_nand_mtd, 1)) {
70eb33d6	219	pr_notice("No NAND device\n");
54d33c4c	220	ret = -ENXIO;
70eb33d6	221	goto err_scan;
54d33c4c MR	222	}
	223
	224	#ifdef CONFIG_MTD_CMDLINE_PARTS
	225	mtd_parts_nb = parse_mtd_partitions(cmx270_nand_mtd, part_probes,
	226	&mtd_parts, 0);
	227	if (mtd_parts_nb > 0)
	228	part_type = "command line";
	229	else
	230	mtd_parts_nb = 0;
	231	#endif
	232	if (!mtd_parts_nb) {
	233	mtd_parts = partition_info;
	234	mtd_parts_nb = NUM_PARTITIONS;
	235	part_type = "static";
	236	}
	237
	238	/* Register the partitions */
70eb33d6	239	pr_notice("Using %s partition definition\n", part_type);
54d33c4c MR	240	ret = add_mtd_partitions(cmx270_nand_mtd, mtd_parts, mtd_parts_nb);
54d33c4c MR	241	if (ret)
70eb33d6	242	goto err_scan;
54d33c4c MR	243
	244	/* Return happy */
	245	return 0;
	246
70eb33d6	247	err_scan:
54d33c4c	248	iounmap(cmx270_nand_io);
70eb33d6	249	err_ioremap:
54d33c4c	250	kfree(cmx270_nand_mtd);
70eb33d6 MR	251	err_kzalloc:
	252	gpio_free(GPIO_NAND_RB);
	253	err_gpio_request:
	254	gpio_free(GPIO_NAND_CS);
54d33c4c MR	255
	256	return ret;
	257
	258	}
	259	module_init(cmx270_init);
	260
	261	/*
	262	* Clean up routine
	263	*/
627df23c	264	static void __exit cmx270_cleanup(void)
54d33c4c MR	265	{
	266	/* Release resources, unregister device */
	267	nand_release(cmx270_nand_mtd);
	268
70eb33d6 MR	269	gpio_free(GPIO_NAND_RB);
	270	gpio_free(GPIO_NAND_CS);
	271
54d33c4c MR	272	iounmap(cmx270_nand_io);
	273
	274	/* Free the MTD device structure */
	275	kfree (cmx270_nand_mtd);
	276	}
	277	module_exit(cmx270_cleanup);
	278
	279	MODULE_LICENSE("GPL");
	280	MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
	281	MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module");