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711fdf62 VW |
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 | ||
20 | struct 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 | */ | |
9d63287a | 33 | static int __devinit plat_nand_probe(struct platform_device *pdev) |
711fdf62 VW |
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; | |
475b44c1 | 57 | data->mtd.name = dev_name(&pdev->dev); |
711fdf62 VW |
58 | |
59 | data->chip.IO_ADDR_R = data->io_base; | |
60 | data->chip.IO_ADDR_W = data->io_base; | |
61 | data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl; | |
62 | data->chip.dev_ready = pdata->ctrl.dev_ready; | |
63 | data->chip.select_chip = pdata->ctrl.select_chip; | |
64 | data->chip.chip_delay = pdata->chip.chip_delay; | |
65 | data->chip.options |= pdata->chip.options; | |
66 | ||
67 | data->chip.ecc.hwctl = pdata->ctrl.hwcontrol; | |
68 | data->chip.ecc.layout = pdata->chip.ecclayout; | |
69 | data->chip.ecc.mode = NAND_ECC_SOFT; | |
70 | ||
71 | platform_set_drvdata(pdev, data); | |
72 | ||
73 | /* Scan to find existance of the device */ | |
74 | if (nand_scan(&data->mtd, 1)) { | |
75 | res = -ENXIO; | |
76 | goto out; | |
77 | } | |
78 | ||
79 | #ifdef CONFIG_MTD_PARTITIONS | |
80 | if (pdata->chip.part_probe_types) { | |
81 | res = parse_mtd_partitions(&data->mtd, | |
82 | pdata->chip.part_probe_types, | |
83 | &data->parts, 0); | |
84 | if (res > 0) { | |
85 | add_mtd_partitions(&data->mtd, data->parts, res); | |
86 | return 0; | |
87 | } | |
88 | } | |
89 | if (pdata->chip.partitions) { | |
90 | data->parts = pdata->chip.partitions; | |
91 | res = add_mtd_partitions(&data->mtd, data->parts, | |
92 | pdata->chip.nr_partitions); | |
93 | } else | |
94 | #endif | |
95 | res = add_mtd_device(&data->mtd); | |
96 | ||
97 | if (!res) | |
98 | return res; | |
99 | ||
100 | nand_release(&data->mtd); | |
101 | out: | |
102 | platform_set_drvdata(pdev, NULL); | |
103 | iounmap(data->io_base); | |
104 | kfree(data); | |
105 | return res; | |
106 | } | |
107 | ||
108 | /* | |
109 | * Remove a NAND device. | |
110 | */ | |
111 | static int __devexit plat_nand_remove(struct platform_device *pdev) | |
112 | { | |
113 | struct plat_nand_data *data = platform_get_drvdata(pdev); | |
a5036778 | 114 | #ifdef CONFIG_MTD_PARTITIONS |
711fdf62 | 115 | struct platform_nand_data *pdata = pdev->dev.platform_data; |
a5036778 | 116 | #endif |
711fdf62 VW |
117 | |
118 | nand_release(&data->mtd); | |
119 | #ifdef CONFIG_MTD_PARTITIONS | |
120 | if (data->parts && data->parts != pdata->chip.partitions) | |
121 | kfree(data->parts); | |
122 | #endif | |
123 | iounmap(data->io_base); | |
124 | kfree(data); | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static struct platform_driver plat_nand_driver = { | |
130 | .probe = plat_nand_probe, | |
131 | .remove = plat_nand_remove, | |
132 | .driver = { | |
133 | .name = "gen_nand", | |
134 | .owner = THIS_MODULE, | |
135 | }, | |
136 | }; | |
137 | ||
138 | static int __init plat_nand_init(void) | |
139 | { | |
140 | return platform_driver_register(&plat_nand_driver); | |
141 | } | |
142 | ||
143 | static void __exit plat_nand_exit(void) | |
144 | { | |
145 | platform_driver_unregister(&plat_nand_driver); | |
146 | } | |
147 | ||
148 | module_init(plat_nand_init); | |
149 | module_exit(plat_nand_exit); | |
150 | ||
151 | MODULE_LICENSE("GPL"); | |
152 | MODULE_AUTHOR("Vitaly Wool"); | |
153 | MODULE_DESCRIPTION("Simple generic NAND driver"); | |
1ff18422 | 154 | MODULE_ALIAS("platform:gen_nand"); |