1 /*
2 * linux/drivers/mtd/onenand/generic.c
3 *
4 * Copyright (c) 2005 Samsung Electronics
5 * Kyungmin Park <kyungmin.park@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Overview:
12 * This is a device driver for the OneNAND flash for generic boards.
13 */
14
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/platform_device.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/mtd/onenand.h>
21 #include <linux/mtd/partitions.h>
22
23 #include <asm/io.h>
24 #include <asm/mach/flash.h>
25
26 #define DRIVER_NAME "onenand"
27
28
29 #ifdef CONFIG_MTD_PARTITIONS
30 static const char *part_probes[] = { "cmdlinepart", NULL, };
31 #endif
32
33 struct onenand_info {
34 struct mtd_info mtd;
35 struct mtd_partition *parts;
36 struct onenand_chip onenand;
37 };
38
39 static int __devinit generic_onenand_probe(struct platform_device *pdev)
40 {
41 struct onenand_info *info;
42 struct flash_platform_data *pdata = pdev->dev.platform_data;
43 struct resource *res = pdev->resource;
44 unsigned long size = res->end - res->start + 1;
45 int err;
46
47 info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
48 if (!info)
49 return -ENOMEM;
50
51 if (!request_mem_region(res->start, size, pdev->dev.driver->name)) {
52 err = -EBUSY;
53 goto out_free_info;
54 }
55
56 info->onenand.base = ioremap(res->start, size);
57 if (!info->onenand.base) {
58 err = -ENOMEM;
59 goto out_release_mem_region;
60 }
61
62 info->onenand.mmcontrol = pdata->mmcontrol;
63 info->onenand.irq = platform_get_irq(pdev, 0);
64
65 info->mtd.name = dev_name(&pdev->dev);
66 info->mtd.priv = &info->onenand;
67 info->mtd.owner = THIS_MODULE;
68
69 if (onenand_scan(&info->mtd, 1)) {
70 err = -ENXIO;
71 goto out_iounmap;
72 }
73
74 #ifdef CONFIG_MTD_PARTITIONS
75 err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
76 if (err > 0)
77 add_mtd_partitions(&info->mtd, info->parts, err);
78 else if (err <= 0 && pdata->parts)
79 add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
80 else
81 #endif
82 err = add_mtd_device(&info->mtd);
83
84 platform_set_drvdata(pdev, info);
85
86 return 0;
87
88 out_iounmap:
89 iounmap(info->onenand.base);
90 out_release_mem_region:
91 release_mem_region(res->start, size);
92 out_free_info:
93 kfree(info);
94
95 return err;
96 }
97
98 static int __devexit generic_onenand_remove(struct platform_device *pdev)
99 {
100 struct onenand_info *info = platform_get_drvdata(pdev);
101 struct resource *res = pdev->resource;
102 unsigned long size = res->end - res->start + 1;
103
104 platform_set_drvdata(pdev, NULL);
105
106 if (info) {
107 if (info->parts)
108 del_mtd_partitions(&info->mtd);
109 else
110 del_mtd_device(&info->mtd);
111
112 onenand_release(&info->mtd);
113 release_mem_region(res->start, size);
114 iounmap(info->onenand.base);
115 kfree(info);
116 }
117
118 return 0;
119 }
120
121 static struct platform_driver generic_onenand_driver = {
122 .driver = {
123 .name = DRIVER_NAME,
124 .owner = THIS_MODULE,
125 },
126 .probe = generic_onenand_probe,
127 .remove = __devexit_p(generic_onenand_remove),
128 };
129
130 MODULE_ALIAS(DRIVER_NAME);
131
132 static int __init generic_onenand_init(void)
133 {
134 return platform_driver_register(&generic_onenand_driver);
135 }
136
137 static void __exit generic_onenand_exit(void)
138 {
139 platform_driver_unregister(&generic_onenand_driver);
140 }
141
142 module_init(generic_onenand_init);
143 module_exit(generic_onenand_exit);
144
145 MODULE_LICENSE("GPL");
146 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
147 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
148
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