blob: cd725fc5e813e7b11f03207944fbb14be33229a6 [file] [log] [blame]
Vitaly Wool711fdf62007-05-06 19:31:18 +04001/*
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");