Commit | Line | Data |
---|---|---|
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 | ||
ffdac7cd | 12 | #include <linux/err.h> |
711fdf62 VW |
13 | #include <linux/io.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/mtd/mtd.h> | |
18 | #include <linux/mtd/nand.h> | |
19 | #include <linux/mtd/partitions.h> | |
20 | ||
21 | struct plat_nand_data { | |
22 | struct nand_chip chip; | |
711fdf62 | 23 | void __iomem *io_base; |
711fdf62 VW |
24 | }; |
25 | ||
26 | /* | |
27 | * Probe for the NAND device. | |
28 | */ | |
06f25510 | 29 | static int plat_nand_probe(struct platform_device *pdev) |
711fdf62 | 30 | { |
453810b7 | 31 | struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev); |
711fdf62 | 32 | struct plat_nand_data *data; |
a0260d21 | 33 | struct mtd_info *mtd; |
2d098a72 | 34 | struct resource *res; |
f2e5a244 | 35 | const char **part_types; |
2d098a72 HS |
36 | int err = 0; |
37 | ||
da3888cb JC |
38 | if (!pdata) { |
39 | dev_err(&pdev->dev, "platform_nand_data is missing\n"); | |
40 | return -EINVAL; | |
41 | } | |
42 | ||
01cd2aba MV |
43 | if (pdata->chip.nr_chips < 1) { |
44 | dev_err(&pdev->dev, "invalid number of chips specified\n"); | |
45 | return -EINVAL; | |
46 | } | |
47 | ||
711fdf62 | 48 | /* Allocate memory for the device structure (and zero it) */ |
ffdac7cd JH |
49 | data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data), |
50 | GFP_KERNEL); | |
a01eb204 | 51 | if (!data) |
711fdf62 | 52 | return -ENOMEM; |
711fdf62 | 53 | |
840f53c3 | 54 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
ffdac7cd JH |
55 | data->io_base = devm_ioremap_resource(&pdev->dev, res); |
56 | if (IS_ERR(data->io_base)) | |
57 | return PTR_ERR(data->io_base); | |
711fdf62 | 58 | |
a61ae81a | 59 | nand_set_flash_node(&data->chip, pdev->dev.of_node); |
a0260d21 | 60 | mtd = nand_to_mtd(&data->chip); |
a0260d21 | 61 | mtd->dev.parent = &pdev->dev; |
711fdf62 VW |
62 | |
63 | data->chip.IO_ADDR_R = data->io_base; | |
64 | data->chip.IO_ADDR_W = data->io_base; | |
65 | data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl; | |
66 | data->chip.dev_ready = pdata->ctrl.dev_ready; | |
67 | data->chip.select_chip = pdata->ctrl.select_chip; | |
d6fed9e9 AC |
68 | data->chip.write_buf = pdata->ctrl.write_buf; |
69 | data->chip.read_buf = pdata->ctrl.read_buf; | |
b4f7aa84 | 70 | data->chip.read_byte = pdata->ctrl.read_byte; |
711fdf62 VW |
71 | data->chip.chip_delay = pdata->chip.chip_delay; |
72 | data->chip.options |= pdata->chip.options; | |
a40f7341 | 73 | data->chip.bbt_options |= pdata->chip.bbt_options; |
711fdf62 VW |
74 | |
75 | data->chip.ecc.hwctl = pdata->ctrl.hwcontrol; | |
711fdf62 | 76 | data->chip.ecc.mode = NAND_ECC_SOFT; |
41ccb49e | 77 | data->chip.ecc.algo = NAND_ECC_HAMMING; |
711fdf62 VW |
78 | |
79 | platform_set_drvdata(pdev, data); | |
80 | ||
bf95efd4 HS |
81 | /* Handle any platform specific setup */ |
82 | if (pdata->ctrl.probe) { | |
2d098a72 HS |
83 | err = pdata->ctrl.probe(pdev); |
84 | if (err) | |
bf95efd4 HS |
85 | goto out; |
86 | } | |
87 | ||
25985edc | 88 | /* Scan to find existence of the device */ |
a0260d21 | 89 | if (nand_scan(mtd, pdata->chip.nr_chips)) { |
2d098a72 | 90 | err = -ENXIO; |
711fdf62 VW |
91 | goto out; |
92 | } | |
93 | ||
8bf57b0d | 94 | part_types = pdata->chip.part_probe_types; |
f2e5a244 | 95 | |
a0260d21 | 96 | err = mtd_device_parse_register(mtd, part_types, NULL, |
42d7fbe2 AB |
97 | pdata->chip.partitions, |
98 | pdata->chip.nr_partitions); | |
711fdf62 | 99 | |
2d098a72 HS |
100 | if (!err) |
101 | return err; | |
711fdf62 | 102 | |
a0260d21 | 103 | nand_release(mtd); |
711fdf62 | 104 | out: |
bf95efd4 HS |
105 | if (pdata->ctrl.remove) |
106 | pdata->ctrl.remove(pdev); | |
2d098a72 | 107 | return err; |
711fdf62 VW |
108 | } |
109 | ||
110 | /* | |
111 | * Remove a NAND device. | |
112 | */ | |
810b7e06 | 113 | static int plat_nand_remove(struct platform_device *pdev) |
711fdf62 VW |
114 | { |
115 | struct plat_nand_data *data = platform_get_drvdata(pdev); | |
453810b7 | 116 | struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev); |
711fdf62 | 117 | |
a0260d21 | 118 | nand_release(nand_to_mtd(&data->chip)); |
bf95efd4 HS |
119 | if (pdata->ctrl.remove) |
120 | pdata->ctrl.remove(pdev); | |
711fdf62 VW |
121 | |
122 | return 0; | |
123 | } | |
124 | ||
a4f20351 JC |
125 | static const struct of_device_id plat_nand_match[] = { |
126 | { .compatible = "gen_nand" }, | |
127 | {}, | |
128 | }; | |
129 | MODULE_DEVICE_TABLE(of, plat_nand_match); | |
130 | ||
711fdf62 | 131 | static struct platform_driver plat_nand_driver = { |
a4f20351 | 132 | .probe = plat_nand_probe, |
5153b88c | 133 | .remove = plat_nand_remove, |
a4f20351 JC |
134 | .driver = { |
135 | .name = "gen_nand", | |
a4f20351 | 136 | .of_match_table = plat_nand_match, |
711fdf62 VW |
137 | }, |
138 | }; | |
139 | ||
f99640de | 140 | module_platform_driver(plat_nand_driver); |
711fdf62 VW |
141 | |
142 | MODULE_LICENSE("GPL"); | |
143 | MODULE_AUTHOR("Vitaly Wool"); | |
144 | MODULE_DESCRIPTION("Simple generic NAND driver"); | |
1ff18422 | 145 | MODULE_ALIAS("platform:gen_nand"); |