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/slab.h>
17 #include <linux/platform_device.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/onenand.h>
20 #include <linux/mtd/partitions.h>
21 #include <asm/io.h>
22
23 /*
24 * Note: Driver name and platform data format have been updated!
25 *
26 * This version of the driver is named "onenand-flash" and takes struct
27 * onenand_platform_data as platform data. The old ARM-specific version
28 * with the name "onenand" used to take struct flash_platform_data.
29 */
30 #define DRIVER_NAME "onenand-flash"
31
32 struct onenand_info {
33 struct mtd_info mtd;
34 struct onenand_chip onenand;
35 };
36
generic_onenand_probe(struct platform_device * pdev)37 static int generic_onenand_probe(struct platform_device *pdev)
38 {
39 struct onenand_info *info;
40 struct onenand_platform_data *pdata = dev_get_platdata(&pdev->dev);
41 struct resource *res = pdev->resource;
42 unsigned long size = resource_size(res);
43 int err;
44
45 info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
46 if (!info)
47 return -ENOMEM;
48
49 if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
50 err = -EBUSY;
51 goto out_free_info;
52 }
53
54 info->onenand.base = ioremap(res->start, size);
55 if (!info->onenand.base) {
56 err = -ENOMEM;
57 goto out_release_mem_region;
58 }
59
60 info->onenand.mmcontrol = pdata ? pdata->mmcontrol : NULL;
61 info->onenand.irq = platform_get_irq(pdev, 0);
62
63 info->mtd.name = dev_name(&pdev->dev);
64 info->mtd.priv = &info->onenand;
65 info->mtd.owner = THIS_MODULE;
66
67 if (onenand_scan(&info->mtd, 1)) {
68 err = -ENXIO;
69 goto out_iounmap;
70 }
71
72 err = mtd_device_parse_register(&info->mtd, NULL, NULL,
73 pdata ? pdata->parts : NULL,
74 pdata ? pdata->nr_parts : 0);
75
76 platform_set_drvdata(pdev, info);
77
78 return 0;
79
80 out_iounmap:
81 iounmap(info->onenand.base);
82 out_release_mem_region:
83 release_mem_region(res->start, size);
84 out_free_info:
85 kfree(info);
86
87 return err;
88 }
89
generic_onenand_remove(struct platform_device * pdev)90 static int generic_onenand_remove(struct platform_device *pdev)
91 {
92 struct onenand_info *info = platform_get_drvdata(pdev);
93 struct resource *res = pdev->resource;
94 unsigned long size = resource_size(res);
95
96 if (info) {
97 onenand_release(&info->mtd);
98 release_mem_region(res->start, size);
99 iounmap(info->onenand.base);
100 kfree(info);
101 }
102
103 return 0;
104 }
105
106 static struct platform_driver generic_onenand_driver = {
107 .driver = {
108 .name = DRIVER_NAME,
109 .owner = THIS_MODULE,
110 },
111 .probe = generic_onenand_probe,
112 .remove = generic_onenand_remove,
113 };
114
115 module_platform_driver(generic_onenand_driver);
116
117 MODULE_LICENSE("GPL");
118 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
119 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
120 MODULE_ALIAS("platform:" DRIVER_NAME);
121