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 */
33 static int __devinit plat_nand_probe(struct platform_device *pdev)
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;
57 data->mtd.name = dev_name(&pdev->dev);
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.write_buf = pdata->ctrl.write_buf;
65 data->chip.read_buf = pdata->ctrl.read_buf;
66 data->chip.chip_delay = pdata->chip.chip_delay;
67 data->chip.options |= pdata->chip.options;
68
69 data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
70 data->chip.ecc.layout = pdata->chip.ecclayout;
71 data->chip.ecc.mode = NAND_ECC_SOFT;
72
73 platform_set_drvdata(pdev, data);
74
75 /* Handle any platform specific setup */
76 if (pdata->ctrl.probe) {
77 res = pdata->ctrl.probe(pdev);
78 if (res)
79 goto out;
80 }
81
82 /* Scan to find existance of the device */
83 if (nand_scan(&data->mtd, 1)) {
84 res = -ENXIO;
85 goto out;
86 }
87
88 #ifdef CONFIG_MTD_PARTITIONS
89 if (pdata->chip.part_probe_types) {
90 res = parse_mtd_partitions(&data->mtd,
91 pdata->chip.part_probe_types,
92 &data->parts, 0);
93 if (res > 0) {
94 add_mtd_partitions(&data->mtd, data->parts, res);
95 return 0;
96 }
97 }
98 if (pdata->chip.set_parts)
99 pdata->chip.set_parts(data->mtd.size, &pdata->chip);
100 if (pdata->chip.partitions) {
101 data->parts = pdata->chip.partitions;
102 res = add_mtd_partitions(&data->mtd, data->parts,
103 pdata->chip.nr_partitions);
104 } else
105 #endif
106 res = add_mtd_device(&data->mtd);
107
108 if (!res)
109 return res;
110
111 nand_release(&data->mtd);
112 out:
113 if (pdata->ctrl.remove)
114 pdata->ctrl.remove(pdev);
115 platform_set_drvdata(pdev, NULL);
116 iounmap(data->io_base);
117 kfree(data);
118 return res;
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;
128
129 nand_release(&data->mtd);
130 #ifdef CONFIG_MTD_PARTITIONS
131 if (data->parts && data->parts != pdata->chip.partitions)
132 kfree(data->parts);
133 #endif
134 if (pdata->ctrl.remove)
135 pdata->ctrl.remove(pdev);
136 iounmap(data->io_base);
137 kfree(data);
138
139 return 0;
140 }
141
142 static struct platform_driver plat_nand_driver = {
143 .probe = plat_nand_probe,
144 .remove = __devexit_p(plat_nand_remove),
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");
167 MODULE_ALIAS("platform:gen_nand");
168
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