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

/*
 * drivers/mtd/nand/orion_nand.c
 *
 * NAND support for Marvell Orion SoC platforms
 *
 * Tzachi Perelstein <tzachi@marvell.com>
 *
 * This file is licensed under  the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <asm/sizes.h>
#include <mach/hardware.h>
#include <plat/orion_nand.h>

static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
	struct nand_chip *nc = mtd->priv;
	struct orion_nand_data *board = nc->priv;
	u32 offs;

	if (cmd == NAND_CMD_NONE)
		return;

	if (ctrl & NAND_CLE)
		offs = (1 << board->cle);
	else if (ctrl & NAND_ALE)
		offs = (1 << board->ale);
	else
		return;

	if (nc->options & NAND_BUSWIDTH_16)
		offs <<= 1;

	writeb(cmd, nc->IO_ADDR_W + offs);
}

static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
	struct nand_chip *chip = mtd->priv;
	void __iomem *io_base = chip->IO_ADDR_R;
	uint64_t *buf64;
	int i = 0;

	while (len && (unsigned long)buf & 7) {
		*buf++ = readb(io_base);
		len--;
	}
	buf64 = (uint64_t *)buf;
	while (i < len/8) {
		/*
		 * Since GCC has no proper constraint (PR 43518)
		 * force x variable to r2/r3 registers as ldrd instruction
		 * requires first register to be even.
		 */
		register uint64_t x asm ("r2");

		asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
		buf64[i++] = x;
	}
	i *= 8;
	while (i < len)
		buf[i++] = readb(io_base);
}

static int __init orion_nand_probe(struct platform_device *pdev)
{
	struct mtd_info *mtd;
	struct nand_chip *nc;
	struct orion_nand_data *board;
	struct resource *res;
	void __iomem *io_base;
	int ret = 0;
	struct mtd_partition *partitions = NULL;
	int num_part = 0;

	nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
	if (!nc) {
		printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
		ret = -ENOMEM;
		goto no_res;
	}
	mtd = (struct mtd_info *)(nc + 1);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -ENODEV;
		goto no_res;
	}

	io_base = ioremap(res->start, resource_size(res));
	if (!io_base) {
		printk(KERN_ERR "orion_nand: ioremap failed\n");
		ret = -EIO;
		goto no_res;
	}

	board = pdev->dev.platform_data;

	mtd->priv = nc;
	mtd->owner = THIS_MODULE;

	nc->priv = board;
	nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
	nc->cmd_ctrl = orion_nand_cmd_ctrl;
	nc->read_buf = orion_nand_read_buf;
	nc->ecc.mode = NAND_ECC_SOFT;

	if (board->chip_delay)
		nc->chip_delay = board->chip_delay;

	if (board->width == 16)
		nc->options |= NAND_BUSWIDTH_16;

	if (board->dev_ready)
		nc->dev_ready = board->dev_ready;

	platform_set_drvdata(pdev, mtd);

	if (nand_scan(mtd, 1)) {
		ret = -ENXIO;
		goto no_dev;
	}

	mtd->name = "orion_nand";
	num_part = parse_mtd_partitions(mtd, NULL, &partitions, 0);
	/* If cmdline partitions have been passed, let them be used */
	if (num_part <= 0) {
		num_part = board->nr_parts;
		partitions = board->parts;
	}

	ret = mtd_device_register(mtd, partitions, num_part);
	if (ret) {
		nand_release(mtd);
		goto no_dev;
	}

	return 0;

no_dev:
	platform_set_drvdata(pdev, NULL);
	iounmap(io_base);
no_res:
	kfree(nc);

	return ret;
}

static int __devexit orion_nand_remove(struct platform_device *pdev)
{
	struct mtd_info *mtd = platform_get_drvdata(pdev);
	struct nand_chip *nc = mtd->priv;

	nand_release(mtd);

	iounmap(nc->IO_ADDR_W);

	kfree(nc);

	return 0;
}

static struct platform_driver orion_nand_driver = {
	.remove		= __devexit_p(orion_nand_remove),
	.driver		= {
		.name	= "orion_nand",
		.owner	= THIS_MODULE,
	},
};

static int __init orion_nand_init(void)
{
	return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
}

static void __exit orion_nand_exit(void)
{
	platform_driver_unregister(&orion_nand_driver);
}

module_init(orion_nand_init);
module_exit(orion_nand_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Tzachi Perelstein");
MODULE_DESCRIPTION("NAND glue for Orion platforms");
MODULE_ALIAS("platform:orion_nand");
Commit	Line	Data
2a1dba29 TP	1	/*
	2	* drivers/mtd/nand/orion_nand.c
	3	*
	4	* NAND support for Marvell Orion SoC platforms
	5	*
	6	* Tzachi Perelstein <tzachi@marvell.com>
	7	*
	8	* This file is licensed under the terms of the GNU General Public
	9	* License version 2. This program is licensed "as is" without any
	10	* warranty of any kind, whether express or implied.
	11	*/
	12
	13	#include <linux/slab.h>
	14	#include <linux/module.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/mtd/mtd.h>
	17	#include <linux/mtd/nand.h>
	18	#include <linux/mtd/partitions.h>
	19	#include <asm/io.h>
	20	#include <asm/sizes.h>
a09e64fb	21	#include <mach/hardware.h>
6f088f1d	22	#include <plat/orion_nand.h>
2a1dba29	23
2a1dba29 TP	24	static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
	25	{
	26	struct nand_chip *nc = mtd->priv;
	27	struct orion_nand_data *board = nc->priv;
	28	u32 offs;
	29
	30	if (cmd == NAND_CMD_NONE)
	31	return;
	32
	33	if (ctrl & NAND_CLE)
	34	offs = (1 << board->cle);
	35	else if (ctrl & NAND_ALE)
	36	offs = (1 << board->ale);
	37	else
	38	return;
	39
	40	if (nc->options & NAND_BUSWIDTH_16)
	41	offs <<= 1;
	42
	43	writeb(cmd, nc->IO_ADDR_W + offs);
	44	}
	45
bfee1a43 NP	46	static void orion_nand_read_buf(struct mtd_info mtd, uint8_t buf, int len)
	47	{
	48	struct nand_chip *chip = mtd->priv;
	49	void __iomem *io_base = chip->IO_ADDR_R;
	50	uint64_t *buf64;
	51	int i = 0;
	52
	53	while (len && (unsigned long)buf & 7) {
	54	*buf++ = readb(io_base);
	55	len--;
	56	}
	57	buf64 = (uint64_t *)buf;
	58	while (i < len/8) {
a88a2b88 PZ	59	/*
	60	* Since GCC has no proper constraint (PR 43518)
	61	* force x variable to r2/r3 registers as ldrd instruction
	62	* requires first register to be even.
	63	*/
	64	register uint64_t x asm ("r2");
	65
94da210a	66	asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
bfee1a43 NP	67	buf64[i++] = x;
	68	}
	69	i *= 8;
	70	while (i < len)
	71	buf[i++] = readb(io_base);
	72	}
	73
2a1dba29 TP	74	static int __init orion_nand_probe(struct platform_device *pdev)
	75	{
	76	struct mtd_info *mtd;
	77	struct nand_chip *nc;
	78	struct orion_nand_data *board;
e9903060	79	struct resource *res;
2a1dba29 TP	80	void __iomem *io_base;
2a1dba29 TP	81	int ret = 0;
2a1dba29 TP	82	struct mtd_partition *partitions = NULL;
2a1dba29 TP	83	int num_part = 0;
2a1dba29 TP	84
	85	nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
	86	if (!nc) {
	87	printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
	88	ret = -ENOMEM;
	89	goto no_res;
	90	}
	91	mtd = (struct mtd_info *)(nc + 1);
	92
e9903060 HS	93	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
e9903060 HS	94	if (!res) {
2d6bfc26	95	ret = -ENODEV;
e9903060 HS	96	goto no_res;
	97	}
	98
	99	io_base = ioremap(res->start, resource_size(res));
2a1dba29 TP	100	if (!io_base) {
	101	printk(KERN_ERR "orion_nand: ioremap failed\n");
	102	ret = -EIO;
	103	goto no_res;
	104	}
	105
	106	board = pdev->dev.platform_data;
	107
	108	mtd->priv = nc;
	109	mtd->owner = THIS_MODULE;
	110
	111	nc->priv = board;
	112	nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
	113	nc->cmd_ctrl = orion_nand_cmd_ctrl;
bfee1a43	114	nc->read_buf = orion_nand_read_buf;
2a1dba29 TP	115	nc->ecc.mode = NAND_ECC_SOFT;
2a1dba29 TP	116
f4db56ff SB	117	if (board->chip_delay)
	118	nc->chip_delay = board->chip_delay;
	119
2a1dba29 TP	120	if (board->width == 16)
	121	nc->options \|= NAND_BUSWIDTH_16;
	122
eedfea25 BD	123	if (board->dev_ready)
	124	nc->dev_ready = board->dev_ready;
	125
2a1dba29 TP	126	platform_set_drvdata(pdev, mtd);
	127
	128	if (nand_scan(mtd, 1)) {
	129	ret = -ENXIO;
	130	goto no_dev;
	131	}
	132
2a1dba29	133	mtd->name = "orion_nand";
4ac6b3ef	134	num_part = parse_mtd_partitions(mtd, NULL, &partitions, 0);
2a1dba29 TP	135	/* If cmdline partitions have been passed, let them be used */
	136	if (num_part <= 0) {
	137	num_part = board->nr_parts;
	138	partitions = board->parts;
	139	}
	140
55c0689c	141	ret = mtd_device_register(mtd, partitions, num_part);
2a1dba29 TP	142	if (ret) {
	143	nand_release(mtd);
	144	goto no_dev;
	145	}
	146
	147	return 0;
	148
	149	no_dev:
	150	platform_set_drvdata(pdev, NULL);
	151	iounmap(io_base);
	152	no_res:
	153	kfree(nc);
	154
	155	return ret;
	156	}
	157
	158	static int __devexit orion_nand_remove(struct platform_device *pdev)
	159	{
	160	struct mtd_info *mtd = platform_get_drvdata(pdev);
	161	struct nand_chip *nc = mtd->priv;
	162
	163	nand_release(mtd);
	164
	165	iounmap(nc->IO_ADDR_W);
	166
	167	kfree(nc);
	168
	169	return 0;
	170	}
	171
	172	static struct platform_driver orion_nand_driver = {
bdf602bd	173	.remove = __devexit_p(orion_nand_remove),
2a1dba29 TP	174	.driver = {
	175	.name = "orion_nand",
	176	.owner = THIS_MODULE,
	177	},
	178	};
	179
	180	static int __init orion_nand_init(void)
	181	{
f33dabbe	182	return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
2a1dba29 TP	183	}
	184
	185	static void __exit orion_nand_exit(void)
	186	{
	187	platform_driver_unregister(&orion_nand_driver);
	188	}
	189
	190	module_init(orion_nand_init);
	191	module_exit(orion_nand_exit);
	192
	193	MODULE_LICENSE("GPL");
	194	MODULE_AUTHOR("Tzachi Perelstein");
	195	MODULE_DESCRIPTION("NAND glue for Orion platforms");
1ff18422	196	MODULE_ALIAS("platform:orion_nand");