Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
30static const char *part_probes[] = { "cmdlinepart", NULL, };
31#endif
32
33struct onenand_info {
34 struct mtd_info mtd;
35 struct mtd_partition *parts;
36 struct onenand_chip onenand;
37};
38
39static 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 info->onenand.irq = platform_get_irq(pdev, 0);
65
66 info->mtd.name = pdev->dev.bus_id;
67 info->mtd.priv = &info->onenand;
68 info->mtd.owner = THIS_MODULE;
69
70 if (onenand_scan(&info->mtd, 1)) {
71 err = -ENXIO;
72 goto out_iounmap;
73 }
74
75#ifdef CONFIG_MTD_PARTITIONS
76 err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
77 if (err > 0)
78 add_mtd_partitions(&info->mtd, info->parts, err);
79 else if (err < 0 && pdata->parts)
80 add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
81 else
82#endif
83 err = add_mtd_device(&info->mtd);
84
85 dev_set_drvdata(&pdev->dev, info);
86
87 return 0;
88
89out_iounmap:
90 iounmap(info->onenand.base);
91out_release_mem_region:
92 release_mem_region(res->start, size);
93out_free_info:
94 kfree(info);
95
96 return err;
97}
98
99static int __devexit generic_onenand_remove(struct device *dev)
100{
101 struct platform_device *pdev = to_platform_device(dev);
102 struct onenand_info *info = dev_get_drvdata(&pdev->dev);
103 struct resource *res = pdev->resource;
104 unsigned long size = res->end - res->start + 1;
105
106 dev_set_drvdata(&pdev->dev, NULL);
107
108 if (info) {
109 if (info->parts)
110 del_mtd_partitions(&info->mtd);
111 else
112 del_mtd_device(&info->mtd);
113
114 onenand_release(&info->mtd);
115 release_mem_region(res->start, size);
116 iounmap(info->onenand.base);
117 kfree(info);
118 }
119
120 return 0;
121}
122
123static struct device_driver generic_onenand_driver = {
124 .name = DRIVER_NAME,
125 .bus = &platform_bus_type,
126 .probe = generic_onenand_probe,
127 .remove = __devexit_p(generic_onenand_remove),
128};
129
130MODULE_ALIAS(DRIVER_NAME);
131
132static int __init generic_onenand_init(void)
133{
134 return driver_register(&generic_onenand_driver);
135}
136
137static void __exit generic_onenand_exit(void)
138{
139 driver_unregister(&generic_onenand_driver);
140}
141
142module_init(generic_onenand_init);
143module_exit(generic_onenand_exit);
144
145MODULE_LICENSE("GPL");
146MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
147MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");