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 */
plat_nand_probe(struct platform_device * pdev)33 static int __init 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.chip_delay = pdata->chip.chip_delay;
65 data->chip.options |= pdata->chip.options;
66
67 data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
68 data->chip.ecc.layout = pdata->chip.ecclayout;
69 data->chip.ecc.mode = NAND_ECC_SOFT;
70
71 platform_set_drvdata(pdev, data);
72
73 /* Scan to find existance of the device */
74 if (nand_scan(&data->mtd, 1)) {
75 res = -ENXIO;
76 goto out;
77 }
78
79 #ifdef CONFIG_MTD_PARTITIONS
80 if (pdata->chip.part_probe_types) {
81 res = parse_mtd_partitions(&data->mtd,
82 pdata->chip.part_probe_types,
83 &data->parts, 0);
84 if (res > 0) {
85 add_mtd_partitions(&data->mtd, data->parts, res);
86 return 0;
87 }
88 }
89 if (pdata->chip.partitions) {
90 data->parts = pdata->chip.partitions;
91 res = add_mtd_partitions(&data->mtd, data->parts,
92 pdata->chip.nr_partitions);
93 } else
94 #endif
95 res = add_mtd_device(&data->mtd);
96
97 if (!res)
98 return res;
99
100 nand_release(&data->mtd);
101 out:
102 platform_set_drvdata(pdev, NULL);
103 iounmap(data->io_base);
104 kfree(data);
105 return res;
106 }
107
108 /*
109 * Remove a NAND device.
110 */
plat_nand_remove(struct platform_device * pdev)111 static int __devexit plat_nand_remove(struct platform_device *pdev)
112 {
113 struct plat_nand_data *data = platform_get_drvdata(pdev);
114 #ifdef CONFIG_MTD_PARTITIONS
115 struct platform_nand_data *pdata = pdev->dev.platform_data;
116 #endif
117
118 nand_release(&data->mtd);
119 #ifdef CONFIG_MTD_PARTITIONS
120 if (data->parts && data->parts != pdata->chip.partitions)
121 kfree(data->parts);
122 #endif
123 iounmap(data->io_base);
124 kfree(data);
125
126 return 0;
127 }
128
129 static struct platform_driver plat_nand_driver = {
130 .probe = plat_nand_probe,
131 .remove = plat_nand_remove,
132 .driver = {
133 .name = "gen_nand",
134 .owner = THIS_MODULE,
135 },
136 };
137
plat_nand_init(void)138 static int __init plat_nand_init(void)
139 {
140 return platform_driver_register(&plat_nand_driver);
141 }
142
plat_nand_exit(void)143 static void __exit plat_nand_exit(void)
144 {
145 platform_driver_unregister(&plat_nand_driver);
146 }
147
148 module_init(plat_nand_init);
149 module_exit(plat_nand_exit);
150
151 MODULE_LICENSE("GPL");
152 MODULE_AUTHOR("Vitaly Wool");
153 MODULE_DESCRIPTION("Simple generic NAND driver");
154 MODULE_ALIAS("platform:gen_nand");
155