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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; | |
2d098a72 HS |
37 | struct resource *res; |
38 | int err = 0; | |
39 | ||
01cd2aba MV |
40 | if (pdata->chip.nr_chips < 1) { |
41 | dev_err(&pdev->dev, "invalid number of chips specified\n"); | |
42 | return -EINVAL; | |
43 | } | |
44 | ||
2d098a72 HS |
45 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
46 | if (!res) | |
47 | return -ENXIO; | |
711fdf62 VW |
48 | |
49 | /* Allocate memory for the device structure (and zero it) */ | |
50 | data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL); | |
51 | if (!data) { | |
52 | dev_err(&pdev->dev, "failed to allocate device structure.\n"); | |
53 | return -ENOMEM; | |
54 | } | |
55 | ||
2d098a72 HS |
56 | if (!request_mem_region(res->start, resource_size(res), |
57 | dev_name(&pdev->dev))) { | |
58 | dev_err(&pdev->dev, "request_mem_region failed\n"); | |
59 | err = -EBUSY; | |
60 | goto out_free; | |
61 | } | |
62 | ||
63 | data->io_base = ioremap(res->start, resource_size(res)); | |
711fdf62 VW |
64 | if (data->io_base == NULL) { |
65 | dev_err(&pdev->dev, "ioremap failed\n"); | |
2d098a72 HS |
66 | err = -EIO; |
67 | goto out_release_io; | |
711fdf62 VW |
68 | } |
69 | ||
70 | data->chip.priv = &data; | |
71 | data->mtd.priv = &data->chip; | |
72 | data->mtd.owner = THIS_MODULE; | |
475b44c1 | 73 | data->mtd.name = dev_name(&pdev->dev); |
711fdf62 VW |
74 | |
75 | data->chip.IO_ADDR_R = data->io_base; | |
76 | data->chip.IO_ADDR_W = data->io_base; | |
77 | data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl; | |
78 | data->chip.dev_ready = pdata->ctrl.dev_ready; | |
79 | data->chip.select_chip = pdata->ctrl.select_chip; | |
d6fed9e9 AC |
80 | data->chip.write_buf = pdata->ctrl.write_buf; |
81 | data->chip.read_buf = pdata->ctrl.read_buf; | |
711fdf62 VW |
82 | data->chip.chip_delay = pdata->chip.chip_delay; |
83 | data->chip.options |= pdata->chip.options; | |
84 | ||
85 | data->chip.ecc.hwctl = pdata->ctrl.hwcontrol; | |
86 | data->chip.ecc.layout = pdata->chip.ecclayout; | |
87 | data->chip.ecc.mode = NAND_ECC_SOFT; | |
88 | ||
89 | platform_set_drvdata(pdev, data); | |
90 | ||
bf95efd4 HS |
91 | /* Handle any platform specific setup */ |
92 | if (pdata->ctrl.probe) { | |
2d098a72 HS |
93 | err = pdata->ctrl.probe(pdev); |
94 | if (err) | |
bf95efd4 HS |
95 | goto out; |
96 | } | |
97 | ||
25985edc | 98 | /* Scan to find existence of the device */ |
81cbb0b1 | 99 | if (nand_scan(&data->mtd, pdata->chip.nr_chips)) { |
2d098a72 | 100 | err = -ENXIO; |
711fdf62 VW |
101 | goto out; |
102 | } | |
103 | ||
104 | #ifdef CONFIG_MTD_PARTITIONS | |
105 | if (pdata->chip.part_probe_types) { | |
2d098a72 | 106 | err = parse_mtd_partitions(&data->mtd, |
711fdf62 VW |
107 | pdata->chip.part_probe_types, |
108 | &data->parts, 0); | |
2d098a72 HS |
109 | if (err > 0) { |
110 | add_mtd_partitions(&data->mtd, data->parts, err); | |
711fdf62 VW |
111 | return 0; |
112 | } | |
113 | } | |
f36e20c0 HS |
114 | if (pdata->chip.set_parts) |
115 | pdata->chip.set_parts(data->mtd.size, &pdata->chip); | |
711fdf62 VW |
116 | if (pdata->chip.partitions) { |
117 | data->parts = pdata->chip.partitions; | |
2d098a72 | 118 | err = add_mtd_partitions(&data->mtd, data->parts, |
711fdf62 VW |
119 | pdata->chip.nr_partitions); |
120 | } else | |
121 | #endif | |
2d098a72 | 122 | err = add_mtd_device(&data->mtd); |
711fdf62 | 123 | |
2d098a72 HS |
124 | if (!err) |
125 | return err; | |
711fdf62 VW |
126 | |
127 | nand_release(&data->mtd); | |
128 | out: | |
bf95efd4 HS |
129 | if (pdata->ctrl.remove) |
130 | pdata->ctrl.remove(pdev); | |
711fdf62 VW |
131 | platform_set_drvdata(pdev, NULL); |
132 | iounmap(data->io_base); | |
2d098a72 HS |
133 | out_release_io: |
134 | release_mem_region(res->start, resource_size(res)); | |
135 | out_free: | |
711fdf62 | 136 | kfree(data); |
2d098a72 | 137 | return err; |
711fdf62 VW |
138 | } |
139 | ||
140 | /* | |
141 | * Remove a NAND device. | |
142 | */ | |
143 | static int __devexit plat_nand_remove(struct platform_device *pdev) | |
144 | { | |
145 | struct plat_nand_data *data = platform_get_drvdata(pdev); | |
146 | struct platform_nand_data *pdata = pdev->dev.platform_data; | |
2d098a72 HS |
147 | struct resource *res; |
148 | ||
149 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
711fdf62 VW |
150 | |
151 | nand_release(&data->mtd); | |
152 | #ifdef CONFIG_MTD_PARTITIONS | |
153 | if (data->parts && data->parts != pdata->chip.partitions) | |
154 | kfree(data->parts); | |
155 | #endif | |
bf95efd4 HS |
156 | if (pdata->ctrl.remove) |
157 | pdata->ctrl.remove(pdev); | |
711fdf62 | 158 | iounmap(data->io_base); |
2d098a72 | 159 | release_mem_region(res->start, resource_size(res)); |
711fdf62 VW |
160 | kfree(data); |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static struct platform_driver plat_nand_driver = { | |
166 | .probe = plat_nand_probe, | |
24b5ce20 | 167 | .remove = __devexit_p(plat_nand_remove), |
711fdf62 VW |
168 | .driver = { |
169 | .name = "gen_nand", | |
170 | .owner = THIS_MODULE, | |
171 | }, | |
172 | }; | |
173 | ||
174 | static int __init plat_nand_init(void) | |
175 | { | |
176 | return platform_driver_register(&plat_nand_driver); | |
177 | } | |
178 | ||
179 | static void __exit plat_nand_exit(void) | |
180 | { | |
181 | platform_driver_unregister(&plat_nand_driver); | |
182 | } | |
183 | ||
184 | module_init(plat_nand_init); | |
185 | module_exit(plat_nand_exit); | |
186 | ||
187 | MODULE_LICENSE("GPL"); | |
188 | MODULE_AUTHOR("Vitaly Wool"); | |
189 | MODULE_DESCRIPTION("Simple generic NAND driver"); | |
1ff18422 | 190 | MODULE_ALIAS("platform:gen_nand"); |