[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 <asm/arch/hardware.h>
#include <asm/plat-orion/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 int __init orion_nand_probe(struct platform_device *pdev)
{
	struct mtd_info *mtd;
	struct nand_chip *nc;
	struct orion_nand_data *board;
	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);

	io_base = ioremap(pdev->resource[0].start,
			pdev->resource[0].end - pdev->resource[0].start + 1);
	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->ecc.mode = NAND_ECC_SOFT;

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

	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 = {
	.probe		= orion_nand_probe,
	.remove		= orion_nand_remove,
	.driver		= {
		.name	= "orion_nand",
		.owner	= THIS_MODULE,
	},
};

static int __init orion_nand_init(void)
{
	return platform_driver_register(&orion_nand_driver);
}

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>
2a1dba29	21	#include <asm/arch/hardware.h>
5d4294c5	22	#include <asm/plat-orion/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
	50	static int __init orion_nand_probe(struct platform_device *pdev)
	51	{
	52	struct mtd_info *mtd;
	53	struct nand_chip *nc;
	54	struct orion_nand_data *board;
	55	void __iomem *io_base;
	56	int ret = 0;
	57	#ifdef CONFIG_MTD_PARTITIONS
	58	struct mtd_partition *partitions = NULL;
	59	int num_part = 0;
	60	#endif
	61
	62	nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
	63	if (!nc) {
	64	printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
	65	ret = -ENOMEM;
	66	goto no_res;
	67	}
	68	mtd = (struct mtd_info *)(nc + 1);
	69
	70	io_base = ioremap(pdev->resource[0].start,
	71	pdev->resource[0].end - pdev->resource[0].start + 1);
	72	if (!io_base) {
	73	printk(KERN_ERR "orion_nand: ioremap failed\n");
	74	ret = -EIO;
	75	goto no_res;
	76	}
	77
	78	board = pdev->dev.platform_data;
	79
	80	mtd->priv = nc;
	81	mtd->owner = THIS_MODULE;
	82
	83	nc->priv = board;
	84	nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
	85	nc->cmd_ctrl = orion_nand_cmd_ctrl;
	86	nc->ecc.mode = NAND_ECC_SOFT;
87
88	if (board->width == 16)
89	nc->options \|= NAND_BUSWIDTH_16;
90
91	platform_set_drvdata(pdev, mtd);
92
93	if (nand_scan(mtd, 1)) {
94	ret = -ENXIO;
95	goto no_dev;
96	}
97
98	#ifdef CONFIG_MTD_PARTITIONS
99	#ifdef CONFIG_MTD_CMDLINE_PARTS
100	mtd->name = "orion_nand";
101	num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
102	#endif
103	/* If cmdline partitions have been passed, let them be used */
104	if (num_part <= 0) {
105	num_part = board->nr_parts;
106	partitions = board->parts;
107	}
108
109	if (partitions && num_part > 0)
110	ret = add_mtd_partitions(mtd, partitions, num_part);
111	else
112	ret = add_mtd_device(mtd);
113	#else
114	ret = add_mtd_device(mtd);
115	#endif
116
117	if (ret) {
118	nand_release(mtd);
119	goto no_dev;
120	}
121
122	return 0;
123
124	no_dev:
125	platform_set_drvdata(pdev, NULL);
126	iounmap(io_base);
127	no_res:
128	kfree(nc);
129
130	return ret;
131	}
132
133	static int __devexit orion_nand_remove(struct platform_device *pdev)
134	{
135	struct mtd_info *mtd = platform_get_drvdata(pdev);
136	struct nand_chip *nc = mtd->priv;
137
138	nand_release(mtd);
139
140	iounmap(nc->IO_ADDR_W);
141
142	kfree(nc);
143
144	return 0;
145	}
146
147	static struct platform_driver orion_nand_driver = {
148	.probe = orion_nand_probe,
149	.remove = orion_nand_remove,
150	.driver = {
151	.name = "orion_nand",
152	.owner = THIS_MODULE,
153	},
154	};
155
156	static int __init orion_nand_init(void)
157	{
158	return platform_driver_register(&orion_nand_driver);
159	}
160
161	static void __exit orion_nand_exit(void)
162	{
163	platform_driver_unregister(&orion_nand_driver);
164	}
165
166	module_init(orion_nand_init);
167	module_exit(orion_nand_exit);
168
169	MODULE_LICENSE("GPL");
170	MODULE_AUTHOR("Tzachi Perelstein");
171	MODULE_DESCRIPTION("NAND glue for Orion platforms");
1ff18422	172	MODULE_ALIAS("platform:orion_nand");