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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 | #include <asm/io.h> | |
23 | ||
24 | /* | |
25 | * Note: Driver name and platform data format have been updated! | |
26 | * | |
27 | * This version of the driver is named "onenand-flash" and takes struct | |
28 | * onenand_platform_data as platform data. The old ARM-specific version | |
29 | * with the name "onenand" used to take struct flash_platform_data. | |
30 | */ | |
31 | #define DRIVER_NAME "onenand-flash" | |
32 | ||
33 | struct onenand_info { | |
34 | struct mtd_info mtd; | |
35 | struct onenand_chip onenand; | |
36 | }; | |
37 | ||
38 | static int __devinit generic_onenand_probe(struct platform_device *pdev) | |
39 | { | |
40 | struct onenand_info *info; | |
41 | struct onenand_platform_data *pdata = pdev->dev.platform_data; | |
42 | struct resource *res = pdev->resource; | |
43 | unsigned long size = resource_size(res); | |
44 | int err; | |
45 | ||
46 | info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL); | |
47 | if (!info) | |
48 | return -ENOMEM; | |
49 | ||
50 | if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) { | |
51 | err = -EBUSY; | |
52 | goto out_free_info; | |
53 | } | |
54 | ||
55 | info->onenand.base = ioremap(res->start, size); | |
56 | if (!info->onenand.base) { | |
57 | err = -ENOMEM; | |
58 | goto out_release_mem_region; | |
59 | } | |
60 | ||
61 | info->onenand.mmcontrol = pdata ? pdata->mmcontrol : 0; | |
62 | info->onenand.irq = platform_get_irq(pdev, 0); | |
63 | ||
64 | info->mtd.name = dev_name(&pdev->dev); | |
65 | info->mtd.priv = &info->onenand; | |
66 | info->mtd.owner = THIS_MODULE; | |
67 | ||
68 | if (onenand_scan(&info->mtd, 1)) { | |
69 | err = -ENXIO; | |
70 | goto out_iounmap; | |
71 | } | |
72 | ||
73 | err = mtd_device_parse_register(&info->mtd, NULL, NULL, | |
74 | pdata ? pdata->parts : NULL, | |
75 | pdata ? pdata->nr_parts : 0); | |
76 | ||
77 | platform_set_drvdata(pdev, info); | |
78 | ||
79 | return 0; | |
80 | ||
81 | out_iounmap: | |
82 | iounmap(info->onenand.base); | |
83 | out_release_mem_region: | |
84 | release_mem_region(res->start, size); | |
85 | out_free_info: | |
86 | kfree(info); | |
87 | ||
88 | return err; | |
89 | } | |
90 | ||
91 | static int __devexit generic_onenand_remove(struct platform_device *pdev) | |
92 | { | |
93 | struct onenand_info *info = platform_get_drvdata(pdev); | |
94 | struct resource *res = pdev->resource; | |
95 | unsigned long size = resource_size(res); | |
96 | ||
97 | platform_set_drvdata(pdev, NULL); | |
98 | ||
99 | if (info) { | |
100 | onenand_release(&info->mtd); | |
101 | release_mem_region(res->start, size); | |
102 | iounmap(info->onenand.base); | |
103 | kfree(info); | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static struct platform_driver generic_onenand_driver = { | |
110 | .driver = { | |
111 | .name = DRIVER_NAME, | |
112 | .owner = THIS_MODULE, | |
113 | }, | |
114 | .probe = generic_onenand_probe, | |
115 | .remove = __devexit_p(generic_onenand_remove), | |
116 | }; | |
117 | ||
118 | module_platform_driver(generic_onenand_driver); | |
119 | ||
120 | MODULE_LICENSE("GPL"); | |
121 | MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); | |
122 | MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards"); | |
123 | MODULE_ALIAS("platform:" DRIVER_NAME); |