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68ee4b1c KP |
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 | ||
68ee4b1c KP |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> | |
de25968c | 17 | #include <linux/slab.h> |
27f4e083 | 18 | #include <linux/platform_device.h> |
68ee4b1c KP |
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); | |
27f4e083 | 43 | struct flash_platform_data *pdata = pdev->dev.platform_data; |
68ee4b1c KP |
44 | struct resource *res = pdev->resource; |
45 | unsigned long size = res->end - res->start + 1; | |
46 | int err; | |
47 | ||
95b93a0c | 48 | info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL); |
68ee4b1c KP |
49 | if (!info) |
50 | return -ENOMEM; | |
51 | ||
68ee4b1c KP |
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; | |
2c22120f | 64 | info->onenand.irq = platform_get_irq(pdev, 0); |
68ee4b1c | 65 | |
475b44c1 | 66 | info->mtd.name = dev_name(&pdev->dev); |
68ee4b1c KP |
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); | |
ba753211 | 79 | else if (err <= 0 && pdata->parts) |
68ee4b1c KP |
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 | ||
89 | out_iounmap: | |
90 | iounmap(info->onenand.base); | |
91 | out_release_mem_region: | |
92 | release_mem_region(res->start, size); | |
93 | out_free_info: | |
94 | kfree(info); | |
95 | ||
96 | return err; | |
97 | } | |
98 | ||
99 | static 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 | ||
123 | static 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 | ||
130 | MODULE_ALIAS(DRIVER_NAME); | |
131 | ||
132 | static int __init generic_onenand_init(void) | |
133 | { | |
134 | return driver_register(&generic_onenand_driver); | |
135 | } | |
136 | ||
137 | static void __exit generic_onenand_exit(void) | |
138 | { | |
139 | 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"); |