Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux-2.6] / drivers / mtd / onenand / generic.c
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 device *dev)
40 {
41         struct onenand_info *info;
42         struct platform_device *pdev = to_platform_device(dev);
43         struct flash_platform_data *pdata = pdev->dev.platform_data;
44         struct resource *res = pdev->resource;
45         unsigned long size = res->end - res->start + 1;
46         int err;
47
48         info = kmalloc(sizeof(struct onenand_info), GFP_KERNEL);
49         if (!info)
50                 return -ENOMEM;
51
52         memset(info, 0, sizeof(struct onenand_info));
53
54         if (!request_mem_region(res->start, size, dev->driver->name)) {
55                 err = -EBUSY;
56                 goto out_free_info;
57         }
58
59         info->onenand.base = ioremap(res->start, size);
60         if (!info->onenand.base) {
61                 err = -ENOMEM;
62                 goto out_release_mem_region;
63         }
64
65         info->onenand.mmcontrol = pdata->mmcontrol;
66
67         info->mtd.name = pdev->dev.bus_id;
68         info->mtd.priv = &info->onenand;
69         info->mtd.owner = THIS_MODULE;
70
71         if (onenand_scan(&info->mtd, 1)) {
72                 err = -ENXIO;
73                 goto out_iounmap;
74         }
75
76 #ifdef CONFIG_MTD_PARTITIONS
77         err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
78         if (err > 0)
79                 add_mtd_partitions(&info->mtd, info->parts, err);
80         else if (err < 0 && pdata->parts)
81                 add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
82         else
83 #endif
84                 err = add_mtd_device(&info->mtd);
85
86         dev_set_drvdata(&pdev->dev, info);
87
88         return 0;
89
90 out_iounmap:
91         iounmap(info->onenand.base);
92 out_release_mem_region:
93         release_mem_region(res->start, size);
94 out_free_info:
95         kfree(info);
96
97         return err;
98 }
99
100 static int __devexit generic_onenand_remove(struct device *dev)
101 {
102         struct platform_device *pdev = to_platform_device(dev);
103         struct onenand_info *info = dev_get_drvdata(&pdev->dev);
104         struct resource *res = pdev->resource;
105         unsigned long size = res->end - res->start + 1;
106
107         dev_set_drvdata(&pdev->dev, NULL);
108
109         if (info) {
110                 if (info->parts)
111                         del_mtd_partitions(&info->mtd);
112                 else
113                         del_mtd_device(&info->mtd);
114
115                 onenand_release(&info->mtd);
116                 release_mem_region(res->start, size);
117                 iounmap(info->onenand.base);
118                 kfree(info);
119         }
120
121         return 0;
122 }
123
124 static struct device_driver generic_onenand_driver = {
125         .name           = DRIVER_NAME,
126         .bus            = &platform_bus_type,
127         .probe          = generic_onenand_probe,
128         .remove         = __devexit_p(generic_onenand_remove),
129 };
130
131 MODULE_ALIAS(DRIVER_NAME);
132
133 static int __init generic_onenand_init(void)
134 {
135         return driver_register(&generic_onenand_driver);
136 }
137
138 static void __exit generic_onenand_exit(void)
139 {
140         driver_unregister(&generic_onenand_driver);
141 }
142
143 module_init(generic_onenand_init);
144 module_exit(generic_onenand_exit);
145
146 MODULE_LICENSE("GPL");
147 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
148 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");