/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
 33static const char *part_probes[] = { "cmdlinepart", NULL,  };
 34
 35struct onenand_info {
 36	struct mtd_info		mtd;
 37	struct mtd_partition	*parts;
 38	struct onenand_chip	onenand;
 39};
 40
 41static int __devinit generic_onenand_probe(struct platform_device *pdev)
 42{
 43	struct onenand_info *info;
 44	struct onenand_platform_data *pdata = pdev->dev.platform_data;
 45	struct resource *res = pdev->resource;
 46	unsigned long size = resource_size(res);
 47	int err;
 48
 49	info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
 50	if (!info)
 51		return -ENOMEM;
 52
 53	if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
 54		err = -EBUSY;
 55		goto out_free_info;
 56	}
 57
 58	info->onenand.base = ioremap(res->start, size);
 59	if (!info->onenand.base) {
 60		err = -ENOMEM;
 61		goto out_release_mem_region;
 62	}
 63
 64	info->onenand.mmcontrol = pdata ? pdata->mmcontrol : 0;
 65	info->onenand.irq = platform_get_irq(pdev, 0);
 66
 67	info->mtd.name = dev_name(&pdev->dev);
 68	info->mtd.priv = &info->onenand;
 69	info->mtd.owner = THIS_MODULE;
 70
 71	if (onenand_scan(&info->mtd, 1)) {
 72		err = -ENXIO;
 73		goto out_iounmap;
 74	}
 75
 76	err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
 77	if (err > 0)
 78		mtd_device_register(&info->mtd, info->parts, err);
 79	else if (err <= 0 && pdata && pdata->parts)
 80		mtd_device_register(&info->mtd, pdata->parts, pdata->nr_parts);
 81	else
 82		err = mtd_device_register(&info->mtd, NULL, 0);
 83
 84	platform_set_drvdata(pdev, info);
 85
 86	return 0;
 87
 88out_iounmap:
 89	iounmap(info->onenand.base);
 90out_release_mem_region:
 91	release_mem_region(res->start, size);
 92out_free_info:
 93	kfree(info);
 94
 95	return err;
 96}
 97
 98static int __devexit generic_onenand_remove(struct platform_device *pdev)
 99{
100	struct onenand_info *info = platform_get_drvdata(pdev);
101	struct resource *res = pdev->resource;
102	unsigned long size = resource_size(res);
103
104	platform_set_drvdata(pdev, NULL);
105
106	if (info) {
107		mtd_device_unregister(&info->mtd);
108		onenand_release(&info->mtd);
109		release_mem_region(res->start, size);
110		iounmap(info->onenand.base);
111		kfree(info);
112	}
113
114	return 0;
115}
116
117static struct platform_driver generic_onenand_driver = {
118	.driver = {
119		.name		= DRIVER_NAME,
120		.owner		= THIS_MODULE,
121	},
122	.probe		= generic_onenand_probe,
123	.remove		= __devexit_p(generic_onenand_remove),
124};
125
126MODULE_ALIAS("platform:" DRIVER_NAME);
127
128static int __init generic_onenand_init(void)
129{
130	return platform_driver_register(&generic_onenand_driver);
131}
132
133static void __exit generic_onenand_exit(void)
134{
135	platform_driver_unregister(&generic_onenand_driver);
136}
137
138module_init(generic_onenand_init);
139module_exit(generic_onenand_exit);
140
141MODULE_LICENSE("GPL");
142MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
143MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");