[mirror_ubuntu-artful-kernel.git] / drivers / mtd / maps / physmap.c

/*
 * $Id: physmap.c,v 1.39 2005/11/29 14:49:36 gleixner Exp $
 *
 * Normal mappings of chips in physical memory
 *
 * Copyright (C) 2003 MontaVista Software Inc.
 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
 *
 * 031022 - [jsun] add run-time configure and partition setup
 */

#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/config.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>
#include <asm/io.h>

struct physmap_flash_info {
	struct mtd_info		*mtd;
	struct map_info		map;
	struct resource		*res;
#ifdef CONFIG_MTD_PARTITIONS
	int			nr_parts;
	struct mtd_partition	*parts;
#endif
};


static int physmap_flash_remove(struct platform_device *dev)
{
	struct physmap_flash_info *info;
	struct physmap_flash_data *physmap_data;

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

	physmap_data = dev->dev.platform_data;

	if (info->mtd != NULL) {
#ifdef CONFIG_MTD_PARTITIONS
		if (info->nr_parts) {
			del_mtd_partitions(info->mtd);
			kfree(info->parts);
		} else if (physmap_data->nr_parts) {
			del_mtd_partitions(info->mtd);
		} else {
			del_mtd_device(info->mtd);
		}
#else
		del_mtd_device(info->mtd);
#endif
		map_destroy(info->mtd);
	}

	if (info->map.virt != NULL)
		iounmap((void *)info->map.virt);

	if (info->res != NULL) {
		release_resource(info->res);
		kfree(info->res);
	}

	return 0;
}

static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
#endif

static int physmap_flash_probe(struct platform_device *dev)
{
	struct physmap_flash_data *physmap_data;
	struct physmap_flash_info *info;
	const char **probe_type;
	int err;

	physmap_data = dev->dev.platform_data;
	if (physmap_data == NULL)
		return -ENODEV;

       	printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
	    (unsigned long long)dev->resource->end - dev->resource->start + 1,
	    (unsigned long long)dev->resource->start);

	info = kmalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
	if (info == NULL) {
		err = -ENOMEM;
		goto err_out;
	}
	memset(info, 0, sizeof(*info));

	platform_set_drvdata(dev, info);

	info->res = request_mem_region(dev->resource->start,
			dev->resource->end - dev->resource->start + 1,
			dev->dev.bus_id);
	if (info->res == NULL) {
		dev_err(&dev->dev, "Could not reserve memory region\n");
		err = -ENOMEM;
		goto err_out;
	}

	info->map.name = dev->dev.bus_id;
	info->map.phys = dev->resource->start;
	info->map.size = dev->resource->end - dev->resource->start + 1;
	info->map.bankwidth = physmap_data->width;
	info->map.set_vpp = physmap_data->set_vpp;

	info->map.virt = ioremap(info->map.phys, info->map.size);
	if (info->map.virt == NULL) {
		dev_err(&dev->dev, "Failed to ioremap flash region\n");
		err = EIO;
		goto err_out;
	}

	simple_map_init(&info->map);

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

#ifdef CONFIG_MTD_PARTITIONS
	err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
	if (err > 0) {
		add_mtd_partitions(info->mtd, info->parts, err);
		return 0;
	}

	if (physmap_data->nr_parts) {
		printk(KERN_NOTICE "Using physmap partition information\n");
		add_mtd_partitions(info->mtd, physmap_data->parts,
						physmap_data->nr_parts);
		return 0;
	}
#endif

	add_mtd_device(info->mtd);
	return 0;

err_out:
	physmap_flash_remove(dev);
	return err;
}

static struct platform_driver physmap_flash_driver = {
	.probe		= physmap_flash_probe,
	.remove		= physmap_flash_remove,
	.driver		= {
		.name	= "physmap-flash",
	},
};


#ifdef CONFIG_MTD_PHYSMAP_LEN
#if CONFIG_MTD_PHYSMAP_LEN != 0
#warning using PHYSMAP compat code
#define PHYSMAP_COMPAT
#endif
#endif

#ifdef PHYSMAP_COMPAT
static struct physmap_flash_data physmap_flash_data = {
	.width		= CONFIG_MTD_PHYSMAP_BANKWIDTH,
};

static struct resource physmap_flash_resource = {
	.start		= CONFIG_MTD_PHYSMAP_START,
	.end		= CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN,
	.flags		= IORESOURCE_MEM,
};

static struct platform_device physmap_flash = {
	.name		= "physmap-flash",
	.id		= 0,
	.dev		= {
		.platform_data	= &physmap_flash_data,
	},
	.num_resources	= 1,
	.resource	= &physmap_flash_resource,
};

void physmap_configure(unsigned long addr, unsigned long size,
		int bankwidth, void (*set_vpp)(struct map_info *, int))
{
	physmap_flash_resource.start = addr;
	physmap_flash_resource.end = addr + size - 1;
	physmap_flash_data.width = bankwidth;
	physmap_flash_data.set_vpp = set_vpp;
}

#ifdef CONFIG_MTD_PARTITIONS
void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
{
	physmap_flash_data.nr_parts = num_parts;
	physmap_flash_data.parts = parts;
}
#endif
#endif

static int __init physmap_init(void)
{
	int err;

	err = platform_driver_register(&physmap_flash_driver);
#ifdef PHYSMAP_COMPAT
	if (err == 0)
		platform_device_register(&physmap_flash);
#endif

	return err;
}

static void __exit physmap_exit(void)
{
#ifdef PHYSMAP_COMPAT
	platform_device_unregister(&physmap_flash);
#endif
	platform_driver_unregister(&physmap_flash_driver);
}

module_init(physmap_init);
module_exit(physmap_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Generic configurable MTD map driver");
Commit	Line	Data
1da177e4	1	/*
2b9175c1	2	* $Id: physmap.c,v 1.39 2005/11/29 14:49:36 gleixner Exp $
1da177e4 LT	3	*
	4	* Normal mappings of chips in physical memory
	5	*
	6	* Copyright (C) 2003 MontaVista Software Inc.
	7	* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
	8	*
	9	* 031022 - [jsun] add run-time configure and partition setup
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/types.h>
	14	#include <linux/kernel.h>
	15	#include <linux/init.h>
	16	#include <linux/slab.h>
73566edf LB	17	#include <linux/device.h>
73566edf LB	18	#include <linux/platform_device.h>
1da177e4 LT	19	#include <linux/mtd/mtd.h>
	20	#include <linux/mtd/map.h>
	21	#include <linux/config.h>
	22	#include <linux/mtd/partitions.h>
2b9175c1	23	#include <linux/mtd/physmap.h>
73566edf	24	#include <asm/io.h>
1da177e4	25
73566edf LB	26	struct physmap_flash_info {
	27	struct mtd_info *mtd;
	28	struct map_info map;
	29	struct resource *res;
	30	#ifdef CONFIG_MTD_PARTITIONS
	31	int nr_parts;
	32	struct mtd_partition *parts;
	33	#endif
1da177e4 LT	34	};
1da177e4 LT	35
73566edf LB	36
	37	static int physmap_flash_remove(struct platform_device *dev)
	38	{
	39	struct physmap_flash_info *info;
	40	struct physmap_flash_data *physmap_data;
	41
	42	info = platform_get_drvdata(dev);
	43	if (info == NULL)
	44	return 0;
	45	platform_set_drvdata(dev, NULL);
	46
	47	physmap_data = dev->dev.platform_data;
	48
	49	if (info->mtd != NULL) {
1da177e4	50	#ifdef CONFIG_MTD_PARTITIONS
73566edf LB	51	if (info->nr_parts) {
	52	del_mtd_partitions(info->mtd);
	53	kfree(info->parts);
	54	} else if (physmap_data->nr_parts) {
	55	del_mtd_partitions(info->mtd);
	56	} else {
	57	del_mtd_device(info->mtd);
	58	}
	59	#else
	60	del_mtd_device(info->mtd);
	61	#endif
	62	map_destroy(info->mtd);
	63	}
1da177e4	64
73566edf LB	65	if (info->map.virt != NULL)
73566edf LB	66	iounmap((void *)info->map.virt);
1da177e4	67
73566edf LB	68	if (info->res != NULL) {
	69	release_resource(info->res);
	70	kfree(info->res);
	71	}
1da177e4	72
73566edf	73	return 0;
1da177e4	74	}
1da177e4	75
73566edf LB	76	static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
	77	#ifdef CONFIG_MTD_PARTITIONS
	78	static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
	79	#endif
	80
	81	static int physmap_flash_probe(struct platform_device *dev)
1da177e4	82	{
73566edf LB	83	struct physmap_flash_data *physmap_data;
	84	struct physmap_flash_info *info;
	85	const char **probe_type;
	86	int err;
	87
	88	physmap_data = dev->dev.platform_data;
	89	if (physmap_data == NULL)
	90	return -ENODEV;
	91
f24ff6bf AM	92	printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
	93	(unsigned long long)dev->resource->end - dev->resource->start + 1,
	94	(unsigned long long)dev->resource->start);
73566edf LB	95
	96	info = kmalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
	97	if (info == NULL) {
	98	err = -ENOMEM;
	99	goto err_out;
	100	}
	101	memset(info, 0, sizeof(*info));
1da177e4	102
73566edf	103	platform_set_drvdata(dev, info);
1da177e4	104
73566edf LB	105	info->res = request_mem_region(dev->resource->start,
	106	dev->resource->end - dev->resource->start + 1,
	107	dev->dev.bus_id);
	108	if (info->res == NULL) {
	109	dev_err(&dev->dev, "Could not reserve memory region\n");
	110	err = -ENOMEM;
	111	goto err_out;
1da177e4 LT	112	}
1da177e4 LT	113
73566edf LB	114	info->map.name = dev->dev.bus_id;
	115	info->map.phys = dev->resource->start;
	116	info->map.size = dev->resource->end - dev->resource->start + 1;
	117	info->map.bankwidth = physmap_data->width;
	118	info->map.set_vpp = physmap_data->set_vpp;
	119
	120	info->map.virt = ioremap(info->map.phys, info->map.size);
	121	if (info->map.virt == NULL) {
	122	dev_err(&dev->dev, "Failed to ioremap flash region\n");
	123	err = EIO;
	124	goto err_out;
	125	}
1da177e4	126
73566edf LB	127	simple_map_init(&info->map);
	128
	129	probe_type = rom_probe_types;
	130	for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
	131	info->mtd = do_map_probe(*probe_type, &info->map);
	132	if (info->mtd == NULL) {
	133	dev_err(&dev->dev, "map_probe failed\n");
	134	err = -ENXIO;
	135	goto err_out;
1da177e4	136	}
73566edf	137	info->mtd->owner = THIS_MODULE;
1da177e4 LT	138
1da177e4 LT	139	#ifdef CONFIG_MTD_PARTITIONS
73566edf LB	140	err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
	141	if (err > 0) {
	142	add_mtd_partitions(info->mtd, info->parts, err);
	143	return 0;
	144	}
1da177e4	145
73566edf LB	146	if (physmap_data->nr_parts) {
	147	printk(KERN_NOTICE "Using physmap partition information\n");
	148	add_mtd_partitions(info->mtd, physmap_data->parts,
	149	physmap_data->nr_parts);
	150	return 0;
	151	}
	152	#endif
	153
	154	add_mtd_device(info->mtd);
	155	return 0;
	156
	157	err_out:
	158	physmap_flash_remove(dev);
	159	return err;
	160	}
	161
	162	static struct platform_driver physmap_flash_driver = {
	163	.probe = physmap_flash_probe,
	164	.remove = physmap_flash_remove,
	165	.driver = {
	166	.name = "physmap-flash",
	167	},
	168	};
1da177e4	169
1da177e4	170
73566edf LB	171	#ifdef CONFIG_MTD_PHYSMAP_LEN
	172	#if CONFIG_MTD_PHYSMAP_LEN != 0
	173	#warning using PHYSMAP compat code
	174	#define PHYSMAP_COMPAT
	175	#endif
1da177e4	176	#endif
1da177e4	177
73566edf LB	178	#ifdef PHYSMAP_COMPAT
	179	static struct physmap_flash_data physmap_flash_data = {
	180	.width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
	181	};
1da177e4	182
73566edf LB	183	static struct resource physmap_flash_resource = {
	184	.start = CONFIG_MTD_PHYSMAP_START,
	185	.end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN,
	186	.flags = IORESOURCE_MEM,
	187	};
1da177e4	188
73566edf LB	189	static struct platform_device physmap_flash = {
	190	.name = "physmap-flash",
	191	.id = 0,
	192	.dev = {
	193	.platform_data = &physmap_flash_data,
	194	},
	195	.num_resources = 1,
	196	.resource = &physmap_flash_resource,
	197	};
	198
	199	void physmap_configure(unsigned long addr, unsigned long size,
	200	int bankwidth, void (set_vpp)(struct map_info , int))
1da177e4	201	{
73566edf LB	202	physmap_flash_resource.start = addr;
	203	physmap_flash_resource.end = addr + size - 1;
	204	physmap_flash_data.width = bankwidth;
	205	physmap_flash_data.set_vpp = set_vpp;
	206	}
	207
1da177e4	208	#ifdef CONFIG_MTD_PARTITIONS
73566edf LB	209	void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
	210	{
	211	physmap_flash_data.nr_parts = num_parts;
	212	physmap_flash_data.parts = parts;
	213	}
	214	#endif
1da177e4	215	#endif
1da177e4	216
73566edf LB	217	static int __init physmap_init(void)
	218	{
	219	int err;
	220
	221	err = platform_driver_register(&physmap_flash_driver);
	222	#ifdef PHYSMAP_COMPAT
	223	if (err == 0)
	224	platform_device_register(&physmap_flash);
	225	#endif
	226
	227	return err;
1da177e4 LT	228	}
1da177e4 LT	229
73566edf LB	230	static void __exit physmap_exit(void)
	231	{
	232	#ifdef PHYSMAP_COMPAT
	233	platform_device_unregister(&physmap_flash);
	234	#endif
	235	platform_driver_unregister(&physmap_flash_driver);
	236	}
1da177e4	237
73566edf LB	238	module_init(physmap_init);
73566edf LB	239	module_exit(physmap_exit);
1da177e4 LT	240
	241	MODULE_LICENSE("GPL");
	242	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	243	MODULE_DESCRIPTION("Generic configurable MTD map driver");