[deliverable/linux.git] / drivers / mtd / maps / rbtx4939-flash.c

/*
 * rbtx4939-flash (based on physmap.c)
 *
 * This is a simplified physmap driver with map_init callback function.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Copyright (C) 2009 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/txx9/rbtx4939.h>

struct rbtx4939_flash_info {
	struct mtd_info *mtd;
	struct map_info map;
	int nr_parts;
	struct mtd_partition *parts;
};

static int rbtx4939_flash_remove(struct platform_device *dev)
{
	struct rbtx4939_flash_info *info;

	info = platform_get_drvdata(dev);
	if (!info)
		return 0;
	platform_set_drvdata(dev, NULL);

	if (info->mtd) {
		struct rbtx4939_flash_data *pdata = dev->dev.platform_data;

		if (info->nr_parts)
			kfree(info->parts);
		mtd_device_unregister(info->mtd);
		map_destroy(info->mtd);
	}
	return 0;
}

static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
static const char *part_probe_types[] = { "cmdlinepart", NULL };

static int rbtx4939_flash_probe(struct platform_device *dev)
{
	struct rbtx4939_flash_data *pdata;
	struct rbtx4939_flash_info *info;
	struct resource *res;
	const char **probe_type;
	int err = 0;
	unsigned long size;

	pdata = dev->dev.platform_data;
	if (!pdata)
		return -ENODEV;

	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;
	info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
			    GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	platform_set_drvdata(dev, info);

	size = resource_size(res);
	pr_notice("rbtx4939 platform flash device: %pR\n", res);

	if (!devm_request_mem_region(&dev->dev, res->start, size,
				     dev_name(&dev->dev)))
		return -EBUSY;

	info->map.name = dev_name(&dev->dev);
	info->map.phys = res->start;
	info->map.size = size;
	info->map.bankwidth = pdata->width;

	info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
	if (!info->map.virt)
		return -EBUSY;

	if (pdata->map_init)
		(*pdata->map_init)(&info->map);
	else
		simple_map_init(&info->map);

	probe_type = rom_probe_types;
	for (; !info->mtd && *probe_type; probe_type++)
		info->mtd = do_map_probe(*probe_type, &info->map);
	if (!info->mtd) {
		dev_err(&dev->dev, "map_probe failed\n");
		err = -ENXIO;
		goto err_out;
	}
	info->mtd->owner = THIS_MODULE;
	if (err)
		goto err_out;

	err = parse_mtd_partitions(info->mtd, part_probe_types,
				&info->parts, 0);
	if (err > 0) {
		mtd_device_register(info->mtd, info->parts, err);
		info->nr_parts = err;
		return 0;
	}

	if (pdata->nr_parts) {
		pr_notice("Using rbtx4939 partition information\n");
		mtd_device_register(info->mtd, pdata->parts, pdata->nr_parts);
		return 0;
	}

	mtd_device_register(info->mtd, NULL, 0);
	return 0;

err_out:
	rbtx4939_flash_remove(dev);
	return err;
}

#ifdef CONFIG_PM
static void rbtx4939_flash_shutdown(struct platform_device *dev)
{
	struct rbtx4939_flash_info *info = platform_get_drvdata(dev);

	if (info->mtd->suspend && info->mtd->resume)
		if (info->mtd->suspend(info->mtd) == 0)
			info->mtd->resume(info->mtd);
}
#else
#define rbtx4939_flash_shutdown NULL
#endif

static struct platform_driver rbtx4939_flash_driver = {
	.probe		= rbtx4939_flash_probe,
	.remove		= rbtx4939_flash_remove,
	.shutdown	= rbtx4939_flash_shutdown,
	.driver		= {
		.name	= "rbtx4939-flash",
		.owner	= THIS_MODULE,
	},
};

static int __init rbtx4939_flash_init(void)
{
	return platform_driver_register(&rbtx4939_flash_driver);
}

static void __exit rbtx4939_flash_exit(void)
{
	platform_driver_unregister(&rbtx4939_flash_driver);
}

module_init(rbtx4939_flash_init);
module_exit(rbtx4939_flash_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("RBTX4939 MTD map driver");
MODULE_ALIAS("platform:rbtx4939-flash");
Commit	Line	Data
610f75e7 AN	1	/*
	2	* rbtx4939-flash (based on physmap.c)
	3	*
	4	* This is a simplified physmap driver with map_init callback function.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* Copyright (C) 2009 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/types.h>
	15	#include <linux/kernel.h>
	16	#include <linux/init.h>
	17	#include <linux/slab.h>
	18	#include <linux/device.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/mtd/mtd.h>
	21	#include <linux/mtd/map.h>
	22	#include <linux/mtd/partitions.h>
	23	#include <asm/txx9/rbtx4939.h>
	24
	25	struct rbtx4939_flash_info {
	26	struct mtd_info *mtd;
	27	struct map_info map;
610f75e7 AN	28	int nr_parts;
610f75e7 AN	29	struct mtd_partition *parts;
610f75e7 AN	30	};
	31
	32	static int rbtx4939_flash_remove(struct platform_device *dev)
	33	{
	34	struct rbtx4939_flash_info *info;
	35
	36	info = platform_get_drvdata(dev);
	37	if (!info)
	38	return 0;
	39	platform_set_drvdata(dev, NULL);
	40
	41	if (info->mtd) {
610f75e7 AN	42	struct rbtx4939_flash_data *pdata = dev->dev.platform_data;
610f75e7 AN	43
16b0eb15	44	if (info->nr_parts)
610f75e7	45	kfree(info->parts);
16b0eb15	46	mtd_device_unregister(info->mtd);
610f75e7 AN	47	map_destroy(info->mtd);
	48	}
	49	return 0;
	50	}
	51
	52	static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
610f75e7	53	static const char *part_probe_types[] = { "cmdlinepart", NULL };
610f75e7 AN	54
	55	static int rbtx4939_flash_probe(struct platform_device *dev)
	56	{
	57	struct rbtx4939_flash_data *pdata;
	58	struct rbtx4939_flash_info *info;
	59	struct resource *res;
	60	const char **probe_type;
	61	int err = 0;
	62	unsigned long size;
	63
	64	pdata = dev->dev.platform_data;
	65	if (!pdata)
	66	return -ENODEV;
	67
	68	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	69	if (!res)
	70	return -ENODEV;
	71	info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
	72	GFP_KERNEL);
	73	if (!info)
	74	return -ENOMEM;
	75
	76	platform_set_drvdata(dev, info);
	77
	78	size = resource_size(res);
	79	pr_notice("rbtx4939 platform flash device: %pR\n", res);
	80
	81	if (!devm_request_mem_region(&dev->dev, res->start, size,
	82	dev_name(&dev->dev)))
	83	return -EBUSY;
	84
	85	info->map.name = dev_name(&dev->dev);
	86	info->map.phys = res->start;
	87	info->map.size = size;
	88	info->map.bankwidth = pdata->width;
	89
	90	info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
	91	if (!info->map.virt)
	92	return -EBUSY;
	93
	94	if (pdata->map_init)
	95	(*pdata->map_init)(&info->map);
	96	else
	97	simple_map_init(&info->map);
	98
	99	probe_type = rom_probe_types;
	100	for (; !info->mtd && *probe_type; probe_type++)
	101	info->mtd = do_map_probe(*probe_type, &info->map);
	102	if (!info->mtd) {
	103	dev_err(&dev->dev, "map_probe failed\n");
	104	err = -ENXIO;
	105	goto err_out;
	106	}
	107	info->mtd->owner = THIS_MODULE;
	108	if (err)
	109	goto err_out;
	110
610f75e7 AN	111	err = parse_mtd_partitions(info->mtd, part_probe_types,
	112	&info->parts, 0);
	113	if (err > 0) {
16b0eb15	114	mtd_device_register(info->mtd, info->parts, err);
610f75e7 AN	115	info->nr_parts = err;
	116	return 0;
	117	}
	118
	119	if (pdata->nr_parts) {
	120	pr_notice("Using rbtx4939 partition information\n");
16b0eb15	121	mtd_device_register(info->mtd, pdata->parts, pdata->nr_parts);
610f75e7 AN	122	return 0;
610f75e7 AN	123	}
610f75e7	124
16b0eb15	125	mtd_device_register(info->mtd, NULL, 0);
610f75e7 AN	126	return 0;
	127
	128	err_out:
	129	rbtx4939_flash_remove(dev);
	130	return err;
	131	}
	132
	133	#ifdef CONFIG_PM
610f75e7 AN	134	static void rbtx4939_flash_shutdown(struct platform_device *dev)
	135	{
	136	struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
	137
	138	if (info->mtd->suspend && info->mtd->resume)
	139	if (info->mtd->suspend(info->mtd) == 0)
	140	info->mtd->resume(info->mtd);
	141	}
	142	#else
610f75e7 AN	143	#define rbtx4939_flash_shutdown NULL
	144	#endif
	145
	146	static struct platform_driver rbtx4939_flash_driver = {
	147	.probe = rbtx4939_flash_probe,
	148	.remove = rbtx4939_flash_remove,
610f75e7 AN	149	.shutdown = rbtx4939_flash_shutdown,
	150	.driver = {
	151	.name = "rbtx4939-flash",
	152	.owner = THIS_MODULE,
	153	},
	154	};
	155
	156	static int __init rbtx4939_flash_init(void)
	157	{
	158	return platform_driver_register(&rbtx4939_flash_driver);
	159	}
	160
	161	static void __exit rbtx4939_flash_exit(void)
	162	{
	163	platform_driver_unregister(&rbtx4939_flash_driver);
	164	}
	165
	166	module_init(rbtx4939_flash_init);
	167	module_exit(rbtx4939_flash_exit);
	168
	169	MODULE_LICENSE("GPL");
	170	MODULE_DESCRIPTION("RBTX4939 MTD map driver");
	171	MODULE_ALIAS("platform:rbtx4939-flash");