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
generic_onenand_probe(struct platform_device * pdev)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, 0,
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
generic_onenand_remove(struct platform_device * pdev)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);
124