1/*
2 * Generic NAND driver
3 *
4 * Author: Vitaly Wool <vitalywool@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12#include <linux/io.h>
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/slab.h>
16#include <linux/mtd/mtd.h>
17#include <linux/mtd/nand.h>
18#include <linux/mtd/partitions.h>
19
20struct plat_nand_data {
21	struct nand_chip	chip;
22	struct mtd_info		mtd;
23	void __iomem		*io_base;
24#ifdef CONFIG_MTD_PARTITIONS
25	int			nr_parts;
26	struct mtd_partition	*parts;
27#endif
28};
29
30/*
31 * Probe for the NAND device.
32 */
33static int __init plat_nand_probe(struct platform_device *pdev)
34{
35	struct platform_nand_data *pdata = pdev->dev.platform_data;
36	struct plat_nand_data *data;
37	int res = 0;
38
39	/* Allocate memory for the device structure (and zero it) */
40	data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
41	if (!data) {
42		dev_err(&pdev->dev, "failed to allocate device structure.\n");
43		return -ENOMEM;
44	}
45
46	data->io_base = ioremap(pdev->resource[0].start,
47				pdev->resource[0].end - pdev->resource[0].start + 1);
48	if (data->io_base == NULL) {
49		dev_err(&pdev->dev, "ioremap failed\n");
50		kfree(data);
51		return -EIO;
52	}
53
54	data->chip.priv = &data;
55	data->mtd.priv = &data->chip;
56	data->mtd.owner = THIS_MODULE;
57
58	data->chip.IO_ADDR_R = data->io_base;
59	data->chip.IO_ADDR_W = data->io_base;
60	data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
61	data->chip.dev_ready = pdata->ctrl.dev_ready;
62	data->chip.select_chip = pdata->ctrl.select_chip;
63	data->chip.chip_delay = pdata->chip.chip_delay;
64	data->chip.options |= pdata->chip.options;
65
66	data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
67	data->chip.ecc.layout = pdata->chip.ecclayout;
68	data->chip.ecc.mode = NAND_ECC_SOFT;
69
70	platform_set_drvdata(pdev, data);
71
72	/* Scan to find existance of the device */
73	if (nand_scan(&data->mtd, 1)) {
74		res = -ENXIO;
75		goto out;
76	}
77
78#ifdef CONFIG_MTD_PARTITIONS
79	if (pdata->chip.part_probe_types) {
80		res = parse_mtd_partitions(&data->mtd,
81					pdata->chip.part_probe_types,
82					&data->parts, 0);
83		if (res > 0) {
84			add_mtd_partitions(&data->mtd, data->parts, res);
85			return 0;
86		}
87	}
88	if (pdata->chip.partitions) {
89		data->parts = pdata->chip.partitions;
90		res = add_mtd_partitions(&data->mtd, data->parts,
91			pdata->chip.nr_partitions);
92	} else
93#endif
94	res = add_mtd_device(&data->mtd);
95
96	if (!res)
97		return res;
98
99	nand_release(&data->mtd);
100out:
101	platform_set_drvdata(pdev, NULL);
102	iounmap(data->io_base);
103	kfree(data);
104	return res;
105}
106
107/*
108 * Remove a NAND device.
109 */
110static int __devexit plat_nand_remove(struct platform_device *pdev)
111{
112	struct plat_nand_data *data = platform_get_drvdata(pdev);
113	struct platform_nand_data *pdata = pdev->dev.platform_data;
114
115	nand_release(&data->mtd);
116#ifdef CONFIG_MTD_PARTITIONS
117	if (data->parts && data->parts != pdata->chip.partitions)
118		kfree(data->parts);
119#endif
120	iounmap(data->io_base);
121	kfree(data);
122
123	return 0;
124}
125
126static struct platform_driver plat_nand_driver = {
127	.probe		= plat_nand_probe,
128	.remove		= plat_nand_remove,
129	.driver		= {
130		.name	= "gen_nand",
131		.owner	= THIS_MODULE,
132	},
133};
134
135static int __init plat_nand_init(void)
136{
137	return platform_driver_register(&plat_nand_driver);
138}
139
140static void __exit plat_nand_exit(void)
141{
142	platform_driver_unregister(&plat_nand_driver);
143}
144
145module_init(plat_nand_init);
146module_exit(plat_nand_exit);
147
148MODULE_LICENSE("GPL");
149MODULE_AUTHOR("Vitaly Wool");
150MODULE_DESCRIPTION("Simple generic NAND driver");
151