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 | ||
f2e5a244 HS |
26 | static const char *part_probe_types[] = { "cmdlinepart", NULL }; |
27 | ||
711fdf62 VW |
28 | /* |
29 | * Probe for the NAND device. | |
30 | */ | |
06f25510 | 31 | static int plat_nand_probe(struct platform_device *pdev) |
711fdf62 VW |
32 | { |
33 | struct platform_nand_data *pdata = pdev->dev.platform_data; | |
a4f20351 | 34 | struct mtd_part_parser_data ppdata; |
711fdf62 | 35 | struct plat_nand_data *data; |
2d098a72 | 36 | struct resource *res; |
f2e5a244 | 37 | const char **part_types; |
2d098a72 HS |
38 | int err = 0; |
39 | ||
da3888cb JC |
40 | if (!pdata) { |
41 | dev_err(&pdev->dev, "platform_nand_data is missing\n"); | |
42 | return -EINVAL; | |
43 | } | |
44 | ||
01cd2aba MV |
45 | if (pdata->chip.nr_chips < 1) { |
46 | dev_err(&pdev->dev, "invalid number of chips specified\n"); | |
47 | return -EINVAL; | |
48 | } | |
49 | ||
2d098a72 HS |
50 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
51 | if (!res) | |
52 | return -ENXIO; | |
711fdf62 VW |
53 | |
54 | /* Allocate memory for the device structure (and zero it) */ | |
55 | data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL); | |
56 | if (!data) { | |
57 | dev_err(&pdev->dev, "failed to allocate device structure.\n"); | |
58 | return -ENOMEM; | |
59 | } | |
60 | ||
2d098a72 HS |
61 | if (!request_mem_region(res->start, resource_size(res), |
62 | dev_name(&pdev->dev))) { | |
63 | dev_err(&pdev->dev, "request_mem_region failed\n"); | |
64 | err = -EBUSY; | |
65 | goto out_free; | |
66 | } | |
67 | ||
68 | data->io_base = ioremap(res->start, resource_size(res)); | |
711fdf62 VW |
69 | if (data->io_base == NULL) { |
70 | dev_err(&pdev->dev, "ioremap failed\n"); | |
2d098a72 HS |
71 | err = -EIO; |
72 | goto out_release_io; | |
711fdf62 VW |
73 | } |
74 | ||
75 | data->chip.priv = &data; | |
76 | data->mtd.priv = &data->chip; | |
77 | data->mtd.owner = THIS_MODULE; | |
475b44c1 | 78 | data->mtd.name = dev_name(&pdev->dev); |
711fdf62 VW |
79 | |
80 | data->chip.IO_ADDR_R = data->io_base; | |
81 | data->chip.IO_ADDR_W = data->io_base; | |
82 | data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl; | |
83 | data->chip.dev_ready = pdata->ctrl.dev_ready; | |
84 | data->chip.select_chip = pdata->ctrl.select_chip; | |
d6fed9e9 AC |
85 | data->chip.write_buf = pdata->ctrl.write_buf; |
86 | data->chip.read_buf = pdata->ctrl.read_buf; | |
b4f7aa84 | 87 | data->chip.read_byte = pdata->ctrl.read_byte; |
711fdf62 VW |
88 | data->chip.chip_delay = pdata->chip.chip_delay; |
89 | data->chip.options |= pdata->chip.options; | |
a40f7341 | 90 | data->chip.bbt_options |= pdata->chip.bbt_options; |
711fdf62 VW |
91 | |
92 | data->chip.ecc.hwctl = pdata->ctrl.hwcontrol; | |
93 | data->chip.ecc.layout = pdata->chip.ecclayout; | |
94 | data->chip.ecc.mode = NAND_ECC_SOFT; | |
95 | ||
96 | platform_set_drvdata(pdev, data); | |
97 | ||
bf95efd4 HS |
98 | /* Handle any platform specific setup */ |
99 | if (pdata->ctrl.probe) { | |
2d098a72 HS |
100 | err = pdata->ctrl.probe(pdev); |
101 | if (err) | |
bf95efd4 HS |
102 | goto out; |
103 | } | |
104 | ||
25985edc | 105 | /* Scan to find existence of the device */ |
81cbb0b1 | 106 | if (nand_scan(&data->mtd, pdata->chip.nr_chips)) { |
2d098a72 | 107 | err = -ENXIO; |
711fdf62 VW |
108 | goto out; |
109 | } | |
110 | ||
f2e5a244 HS |
111 | part_types = pdata->chip.part_probe_types ? : part_probe_types; |
112 | ||
a4f20351 JC |
113 | ppdata.of_node = pdev->dev.of_node; |
114 | err = mtd_device_parse_register(&data->mtd, part_types, &ppdata, | |
42d7fbe2 AB |
115 | pdata->chip.partitions, |
116 | pdata->chip.nr_partitions); | |
711fdf62 | 117 | |
2d098a72 HS |
118 | if (!err) |
119 | return err; | |
711fdf62 VW |
120 | |
121 | nand_release(&data->mtd); | |
122 | out: | |
bf95efd4 HS |
123 | if (pdata->ctrl.remove) |
124 | pdata->ctrl.remove(pdev); | |
711fdf62 VW |
125 | platform_set_drvdata(pdev, NULL); |
126 | iounmap(data->io_base); | |
2d098a72 HS |
127 | out_release_io: |
128 | release_mem_region(res->start, resource_size(res)); | |
129 | out_free: | |
711fdf62 | 130 | kfree(data); |
2d098a72 | 131 | return err; |
711fdf62 VW |
132 | } |
133 | ||
134 | /* | |
135 | * Remove a NAND device. | |
136 | */ | |
810b7e06 | 137 | static int plat_nand_remove(struct platform_device *pdev) |
711fdf62 VW |
138 | { |
139 | struct plat_nand_data *data = platform_get_drvdata(pdev); | |
140 | struct platform_nand_data *pdata = pdev->dev.platform_data; | |
2d098a72 HS |
141 | struct resource *res; |
142 | ||
143 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
711fdf62 VW |
144 | |
145 | nand_release(&data->mtd); | |
bf95efd4 HS |
146 | if (pdata->ctrl.remove) |
147 | pdata->ctrl.remove(pdev); | |
711fdf62 | 148 | iounmap(data->io_base); |
2d098a72 | 149 | release_mem_region(res->start, resource_size(res)); |
711fdf62 VW |
150 | kfree(data); |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
a4f20351 JC |
155 | static const struct of_device_id plat_nand_match[] = { |
156 | { .compatible = "gen_nand" }, | |
157 | {}, | |
158 | }; | |
159 | MODULE_DEVICE_TABLE(of, plat_nand_match); | |
160 | ||
711fdf62 | 161 | static struct platform_driver plat_nand_driver = { |
a4f20351 | 162 | .probe = plat_nand_probe, |
5153b88c | 163 | .remove = plat_nand_remove, |
a4f20351 JC |
164 | .driver = { |
165 | .name = "gen_nand", | |
166 | .owner = THIS_MODULE, | |
167 | .of_match_table = plat_nand_match, | |
711fdf62 VW |
168 | }, |
169 | }; | |
170 | ||
f99640de | 171 | module_platform_driver(plat_nand_driver); |
711fdf62 VW |
172 | |
173 | MODULE_LICENSE("GPL"); | |
174 | MODULE_AUTHOR("Vitaly Wool"); | |
175 | MODULE_DESCRIPTION("Simple generic NAND driver"); | |
1ff18422 | 176 | MODULE_ALIAS("platform:gen_nand"); |