[MTD] replace kmalloc+memset with kzalloc
[linux-2.6.git] / 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 = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
49         if (!info)
50                 return -ENOMEM;
51
52         if (!request_mem_region(res->start, size, dev->driver->name)) {
53                 err = -EBUSY;
54                 goto out_free_info;
55         }
56
57         info->onenand.base = ioremap(res->start, size);
58         if (!info->onenand.base) {
59                 err = -ENOMEM;
60                 goto out_release_mem_region;
61         }
62
63         info->onenand.mmcontrol = pdata->mmcontrol;
64
65         info->mtd.name = pdev->dev.bus_id;
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         dev_set_drvdata(&pdev->dev, 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 device *dev)
99 {
100         struct platform_device *pdev = to_platform_device(dev);
101         struct onenand_info *info = dev_get_drvdata(&pdev->dev);
102         struct resource *res = pdev->resource;
103         unsigned long size = res->end - res->start + 1;
104
105         dev_set_drvdata(&pdev->dev, NULL);
106
107         if (info) {
108                 if (info->parts)
109                         del_mtd_partitions(&info->mtd);
110                 else
111                         del_mtd_device(&info->mtd);
112
113                 onenand_release(&info->mtd);
114                 release_mem_region(res->start, size);
115                 iounmap(info->onenand.base);
116                 kfree(info);
117         }
118
119         return 0;
120 }
121
122 static struct device_driver generic_onenand_driver = {
123         .name           = DRIVER_NAME,
124         .bus            = &platform_bus_type,
125         .probe          = generic_onenand_probe,
126         .remove         = __devexit_p(generic_onenand_remove),
127 };
128
129 MODULE_ALIAS(DRIVER_NAME);
130
131 static int __init generic_onenand_init(void)
132 {
133         return driver_register(&generic_onenand_driver);
134 }
135
136 static void __exit generic_onenand_exit(void)
137 {
138         driver_unregister(&generic_onenand_driver);
139 }
140
141 module_init(generic_onenand_init);
142 module_exit(generic_onenand_exit);
143
144 MODULE_LICENSE("GPL");
145 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
146 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");