Commit | Line | Data |
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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; | |
711fdf62 VW |
24 | }; |
25 | ||
26 | /* | |
27 | * Probe for the NAND device. | |
28 | */ | |
9d63287a | 29 | static int __devinit plat_nand_probe(struct platform_device *pdev) |
711fdf62 VW |
30 | { |
31 | struct platform_nand_data *pdata = pdev->dev.platform_data; | |
32 | struct plat_nand_data *data; | |
2d098a72 HS |
33 | struct resource *res; |
34 | int err = 0; | |
35 | ||
01cd2aba MV |
36 | if (pdata->chip.nr_chips < 1) { |
37 | dev_err(&pdev->dev, "invalid number of chips specified\n"); | |
38 | return -EINVAL; | |
39 | } | |
40 | ||
2d098a72 HS |
41 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
42 | if (!res) | |
43 | return -ENXIO; | |
711fdf62 VW |
44 | |
45 | /* Allocate memory for the device structure (and zero it) */ | |
46 | data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL); | |
47 | if (!data) { | |
48 | dev_err(&pdev->dev, "failed to allocate device structure.\n"); | |
49 | return -ENOMEM; | |
50 | } | |
51 | ||
2d098a72 HS |
52 | if (!request_mem_region(res->start, resource_size(res), |
53 | dev_name(&pdev->dev))) { | |
54 | dev_err(&pdev->dev, "request_mem_region failed\n"); | |
55 | err = -EBUSY; | |
56 | goto out_free; | |
57 | } | |
58 | ||
59 | data->io_base = ioremap(res->start, resource_size(res)); | |
711fdf62 VW |
60 | if (data->io_base == NULL) { |
61 | dev_err(&pdev->dev, "ioremap failed\n"); | |
2d098a72 HS |
62 | err = -EIO; |
63 | goto out_release_io; | |
711fdf62 VW |
64 | } |
65 | ||
66 | data->chip.priv = &data; | |
67 | data->mtd.priv = &data->chip; | |
68 | data->mtd.owner = THIS_MODULE; | |
475b44c1 | 69 | data->mtd.name = dev_name(&pdev->dev); |
711fdf62 VW |
70 | |
71 | data->chip.IO_ADDR_R = data->io_base; | |
72 | data->chip.IO_ADDR_W = data->io_base; | |
73 | data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl; | |
74 | data->chip.dev_ready = pdata->ctrl.dev_ready; | |
75 | data->chip.select_chip = pdata->ctrl.select_chip; | |
d6fed9e9 AC |
76 | data->chip.write_buf = pdata->ctrl.write_buf; |
77 | data->chip.read_buf = pdata->ctrl.read_buf; | |
711fdf62 VW |
78 | data->chip.chip_delay = pdata->chip.chip_delay; |
79 | data->chip.options |= pdata->chip.options; | |
a40f7341 | 80 | data->chip.bbt_options |= pdata->chip.bbt_options; |
711fdf62 VW |
81 | |
82 | data->chip.ecc.hwctl = pdata->ctrl.hwcontrol; | |
83 | data->chip.ecc.layout = pdata->chip.ecclayout; | |
84 | data->chip.ecc.mode = NAND_ECC_SOFT; | |
85 | ||
86 | platform_set_drvdata(pdev, data); | |
87 | ||
bf95efd4 HS |
88 | /* Handle any platform specific setup */ |
89 | if (pdata->ctrl.probe) { | |
2d098a72 HS |
90 | err = pdata->ctrl.probe(pdev); |
91 | if (err) | |
bf95efd4 HS |
92 | goto out; |
93 | } | |
94 | ||
25985edc | 95 | /* Scan to find existence of the device */ |
81cbb0b1 | 96 | if (nand_scan(&data->mtd, pdata->chip.nr_chips)) { |
2d098a72 | 97 | err = -ENXIO; |
711fdf62 VW |
98 | goto out; |
99 | } | |
100 | ||
009c8407 DES |
101 | err = mtd_device_parse_register(&data->mtd, |
102 | pdata->chip.part_probe_types, 0, | |
103 | pdata->chip.partitions, pdata->chip.nr_partitions); | |
711fdf62 | 104 | |
2d098a72 HS |
105 | if (!err) |
106 | return err; | |
711fdf62 VW |
107 | |
108 | nand_release(&data->mtd); | |
109 | out: | |
bf95efd4 HS |
110 | if (pdata->ctrl.remove) |
111 | pdata->ctrl.remove(pdev); | |
711fdf62 VW |
112 | platform_set_drvdata(pdev, NULL); |
113 | iounmap(data->io_base); | |
2d098a72 HS |
114 | out_release_io: |
115 | release_mem_region(res->start, resource_size(res)); | |
116 | out_free: | |
711fdf62 | 117 | kfree(data); |
2d098a72 | 118 | return err; |
711fdf62 VW |
119 | } |
120 | ||
121 | /* | |
122 | * Remove a NAND device. | |
123 | */ | |
124 | static int __devexit plat_nand_remove(struct platform_device *pdev) | |
125 | { | |
126 | struct plat_nand_data *data = platform_get_drvdata(pdev); | |
127 | struct platform_nand_data *pdata = pdev->dev.platform_data; | |
2d098a72 HS |
128 | struct resource *res; |
129 | ||
130 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
711fdf62 VW |
131 | |
132 | nand_release(&data->mtd); | |
bf95efd4 HS |
133 | if (pdata->ctrl.remove) |
134 | pdata->ctrl.remove(pdev); | |
711fdf62 | 135 | iounmap(data->io_base); |
2d098a72 | 136 | release_mem_region(res->start, resource_size(res)); |
711fdf62 VW |
137 | kfree(data); |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static struct platform_driver plat_nand_driver = { | |
143 | .probe = plat_nand_probe, | |
24b5ce20 | 144 | .remove = __devexit_p(plat_nand_remove), |
711fdf62 VW |
145 | .driver = { |
146 | .name = "gen_nand", | |
147 | .owner = THIS_MODULE, | |
148 | }, | |
149 | }; | |
150 | ||
151 | static int __init plat_nand_init(void) | |
152 | { | |
153 | return platform_driver_register(&plat_nand_driver); | |
154 | } | |
155 | ||
156 | static void __exit plat_nand_exit(void) | |
157 | { | |
158 | platform_driver_unregister(&plat_nand_driver); | |
159 | } | |
160 | ||
161 | module_init(plat_nand_init); | |
162 | module_exit(plat_nand_exit); | |
163 | ||
164 | MODULE_LICENSE("GPL"); | |
165 | MODULE_AUTHOR("Vitaly Wool"); | |
166 | MODULE_DESCRIPTION("Simple generic NAND driver"); | |
1ff18422 | 167 | MODULE_ALIAS("platform:gen_nand"); |