[net-next-2.6.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>

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

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;
#ifdef CONFIG_MTD_PARTITIONS
	struct mtd_partition *partitions = NULL;
	int num_part = 0;
#endif

	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;
	}

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

	if (partitions && num_part > 0)
		ret = add_mtd_partitions(mtd, partitions, num_part);
	else
		ret = add_mtd_device(mtd);
#else
	ret = add_mtd_device(mtd);
#endif

	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 TP	23
	24	#ifdef CONFIG_MTD_CMDLINE_PARTS
	25	static const char *part_probes[] = { "cmdlinepart", NULL };
	26	#endif
	27
	28	static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
	29	{
	30	struct nand_chip *nc = mtd->priv;
	31	struct orion_nand_data *board = nc->priv;
	32	u32 offs;
	33
	34	if (cmd == NAND_CMD_NONE)
	35	return;
	36
	37	if (ctrl & NAND_CLE)
	38	offs = (1 << board->cle);
	39	else if (ctrl & NAND_ALE)
	40	offs = (1 << board->ale);
	41	else
	42	return;
	43
	44	if (nc->options & NAND_BUSWIDTH_16)
	45	offs <<= 1;
	46
	47	writeb(cmd, nc->IO_ADDR_W + offs);
	48	}
	49
bfee1a43 NP	50	static void orion_nand_read_buf(struct mtd_info mtd, uint8_t buf, int len)
	51	{
	52	struct nand_chip *chip = mtd->priv;
	53	void __iomem *io_base = chip->IO_ADDR_R;
	54	uint64_t *buf64;
	55	int i = 0;
	56
	57	while (len && (unsigned long)buf & 7) {
	58	*buf++ = readb(io_base);
	59	len--;
	60	}
	61	buf64 = (uint64_t *)buf;
	62	while (i < len/8) {
a88a2b88 PZ	63	/*
	64	* Since GCC has no proper constraint (PR 43518)
	65	* force x variable to r2/r3 registers as ldrd instruction
	66	* requires first register to be even.
	67	*/
	68	register uint64_t x asm ("r2");
	69
94da210a	70	asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
bfee1a43 NP	71	buf64[i++] = x;
	72	}
	73	i *= 8;
	74	while (i < len)
	75	buf[i++] = readb(io_base);
	76	}
	77
2a1dba29 TP	78	static int __init orion_nand_probe(struct platform_device *pdev)
	79	{
	80	struct mtd_info *mtd;
	81	struct nand_chip *nc;
	82	struct orion_nand_data *board;
e9903060	83	struct resource *res;
2a1dba29 TP	84	void __iomem *io_base;
	85	int ret = 0;
	86	#ifdef CONFIG_MTD_PARTITIONS
	87	struct mtd_partition *partitions = NULL;
	88	int num_part = 0;
	89	#endif
	90
	91	nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
	92	if (!nc) {
	93	printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
	94	ret = -ENOMEM;
	95	goto no_res;
	96	}
	97	mtd = (struct mtd_info *)(nc + 1);
	98
e9903060 HS	99	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
e9903060 HS	100	if (!res) {
2d6bfc26	101	ret = -ENODEV;
e9903060 HS	102	goto no_res;
	103	}
	104
	105	io_base = ioremap(res->start, resource_size(res));
2a1dba29 TP	106	if (!io_base) {
	107	printk(KERN_ERR "orion_nand: ioremap failed\n");
	108	ret = -EIO;
	109	goto no_res;
	110	}
	111
	112	board = pdev->dev.platform_data;
	113
	114	mtd->priv = nc;
	115	mtd->owner = THIS_MODULE;
	116
	117	nc->priv = board;
	118	nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
	119	nc->cmd_ctrl = orion_nand_cmd_ctrl;
bfee1a43	120	nc->read_buf = orion_nand_read_buf;
2a1dba29 TP	121	nc->ecc.mode = NAND_ECC_SOFT;
2a1dba29 TP	122
f4db56ff SB	123	if (board->chip_delay)
	124	nc->chip_delay = board->chip_delay;
	125
2a1dba29 TP	126	if (board->width == 16)
	127	nc->options \|= NAND_BUSWIDTH_16;
	128
eedfea25 BD	129	if (board->dev_ready)
	130	nc->dev_ready = board->dev_ready;
	131
2a1dba29 TP	132	platform_set_drvdata(pdev, mtd);
	133
	134	if (nand_scan(mtd, 1)) {
	135	ret = -ENXIO;
	136	goto no_dev;
	137	}
	138
	139	#ifdef CONFIG_MTD_PARTITIONS
	140	#ifdef CONFIG_MTD_CMDLINE_PARTS
	141	mtd->name = "orion_nand";
	142	num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
	143	#endif
	144	/* If cmdline partitions have been passed, let them be used */
	145	if (num_part <= 0) {
	146	num_part = board->nr_parts;
	147	partitions = board->parts;
	148	}
	149
	150	if (partitions && num_part > 0)
	151	ret = add_mtd_partitions(mtd, partitions, num_part);
	152	else
	153	ret = add_mtd_device(mtd);
	154	#else
	155	ret = add_mtd_device(mtd);
	156	#endif
	157
	158	if (ret) {
	159	nand_release(mtd);
	160	goto no_dev;
	161	}
	162
	163	return 0;
	164
	165	no_dev:
	166	platform_set_drvdata(pdev, NULL);
	167	iounmap(io_base);
	168	no_res:
	169	kfree(nc);
	170
	171	return ret;
	172	}
	173
	174	static int __devexit orion_nand_remove(struct platform_device *pdev)
	175	{
	176	struct mtd_info *mtd = platform_get_drvdata(pdev);
	177	struct nand_chip *nc = mtd->priv;
	178
	179	nand_release(mtd);
	180
	181	iounmap(nc->IO_ADDR_W);
	182
	183	kfree(nc);
	184
	185	return 0;
	186	}
	187
	188	static struct platform_driver orion_nand_driver = {
bdf602bd	189	.remove = __devexit_p(orion_nand_remove),
2a1dba29 TP	190	.driver = {
	191	.name = "orion_nand",
	192	.owner = THIS_MODULE,
	193	},
	194	};
	195
	196	static int __init orion_nand_init(void)
	197	{
f33dabbe	198	return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
2a1dba29 TP	199	}
	200
	201	static void __exit orion_nand_exit(void)
	202	{
	203	platform_driver_unregister(&orion_nand_driver);
	204	}
	205
	206	module_init(orion_nand_init);
	207	module_exit(orion_nand_exit);
	208
	209	MODULE_LICENSE("GPL");
	210	MODULE_AUTHOR("Tzachi Perelstein");
	211	MODULE_DESCRIPTION("NAND glue for Orion platforms");
1ff18422	212	MODULE_ALIAS("platform:orion_nand");