Root/drivers/mtd/onenand/generic.c

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
33struct onenand_info {
34    struct mtd_info mtd;
35    struct onenand_chip onenand;
36};
37
38static 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
81out_iounmap:
82    iounmap(info->onenand.base);
83out_release_mem_region:
84    release_mem_region(res->start, size);
85out_free_info:
86    kfree(info);
87
88    return err;
89}
90
91static 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
109static 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
118module_platform_driver(generic_onenand_driver);
119
120MODULE_LICENSE("GPL");
121MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
122MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
123MODULE_ALIAS("platform:" DRIVER_NAME);
124

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