[linux.git] / drivers / mtd / chips / map_rom.c

/*
 * Common code to handle map devices which are simple ROM
 * (C) 2000 Red Hat. GPL'd.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>

static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static void maprom_nop (struct mtd_info *);
static struct mtd_info *map_rom_probe(struct map_info *map);
static int maprom_erase (struct mtd_info *mtd, struct erase_info *info);
static unsigned long maprom_unmapped_area(struct mtd_info *, unsigned long,
					  unsigned long, unsigned long);

static struct mtd_chip_driver maprom_chipdrv = {
	.probe	= map_rom_probe,
	.name	= "map_rom",
	.module	= THIS_MODULE
};

static struct mtd_info *map_rom_probe(struct map_info *map)
{
	struct mtd_info *mtd;

	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
	if (!mtd)
		return NULL;

	map->fldrv = &maprom_chipdrv;
	mtd->priv = map;
	mtd->name = map->name;
	mtd->type = MTD_ROM;
	mtd->size = map->size;
	mtd->_get_unmapped_area = maprom_unmapped_area;
	mtd->_read = maprom_read;
	mtd->_write = maprom_write;
	mtd->_sync = maprom_nop;
	mtd->_erase = maprom_erase;
	mtd->flags = MTD_CAP_ROM;
	mtd->erasesize = map->size;
	mtd->writesize = 1;

	__module_get(THIS_MODULE);
	return mtd;
}


/*
 * Allow NOMMU mmap() to directly map the device (if not NULL)
 * - return the address to which the offset maps
 * - return -ENOSYS to indicate refusal to do the mapping
 */
static unsigned long maprom_unmapped_area(struct mtd_info *mtd,
					  unsigned long len,
					  unsigned long offset,
					  unsigned long flags)
{
	struct map_info *map = mtd->priv;
	return (unsigned long) map->virt + offset;
}

static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
	struct map_info *map = mtd->priv;

	map_copy_from(map, buf, from, len);
	*retlen = len;
	return 0;
}

static void maprom_nop(struct mtd_info *mtd)
{
	/* Nothing to see here */
}

static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
	return -EROFS;
}

static int maprom_erase (struct mtd_info *mtd, struct erase_info *info)
{
	/* We do our best 8) */
	return -EROFS;
}

static int __init map_rom_init(void)
{
	register_mtd_chip_driver(&maprom_chipdrv);
	return 0;
}

static void __exit map_rom_exit(void)
{
	unregister_mtd_chip_driver(&maprom_chipdrv);
}

module_init(map_rom_init);
module_exit(map_rom_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <[email protected]>");
MODULE_DESCRIPTION("MTD chip driver for ROM chips");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Common code to handle map devices which are simple ROM
	3	* (C) 2000 Red Hat. GPL'd.
1da177e4 LT	4	*/
	5
	6	#include <linux/module.h>
	7	#include <linux/types.h>
	8	#include <linux/kernel.h>
	9	#include <asm/io.h>
	10	#include <asm/byteorder.h>
	11	#include <linux/errno.h>
	12	#include <linux/slab.h>
	13	#include <linux/init.h>
	14	#include <linux/mtd/mtd.h>
	15	#include <linux/mtd/map.h>
1da177e4 LT	16
	17	static int maprom_read (struct mtd_info , loff_t, size_t, size_t , u_char *);
	18	static int maprom_write (struct mtd_info , loff_t, size_t, size_t , const u_char *);
	19	static void maprom_nop (struct mtd_info *);
	20	static struct mtd_info map_rom_probe(struct map_info map);
5f877607	21	static int maprom_erase (struct mtd_info mtd, struct erase_info info);
402d3265 DH	22	static unsigned long maprom_unmapped_area(struct mtd_info *, unsigned long,
402d3265 DH	23	unsigned long, unsigned long);
1da177e4 LT	24
	25	static struct mtd_chip_driver maprom_chipdrv = {
	26	.probe = map_rom_probe,
	27	.name = "map_rom",
	28	.module = THIS_MODULE
	29	};
	30
	31	static struct mtd_info map_rom_probe(struct map_info map)
	32	{
	33	struct mtd_info *mtd;
	34
95b93a0c	35	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
1da177e4 LT	36	if (!mtd)
	37	return NULL;
	38
1da177e4 LT	39	map->fldrv = &maprom_chipdrv;
	40	mtd->priv = map;
	41	mtd->name = map->name;
21c8db9e	42	mtd->type = MTD_ROM;
1da177e4	43	mtd->size = map->size;
3c3c10bb AB	44	mtd->_get_unmapped_area = maprom_unmapped_area;
	45	mtd->_read = maprom_read;
	46	mtd->_write = maprom_write;
	47	mtd->_sync = maprom_nop;
	48	mtd->_erase = maprom_erase;
1da177e4	49	mtd->flags = MTD_CAP_ROM;
e369d62e	50	mtd->erasesize = map->size;
17ffc7ba	51	mtd->writesize = 1;
1da177e4 LT	52
	53	__module_get(THIS_MODULE);
	54	return mtd;
	55	}
	56
	57
402d3265 DH	58	/*
	59	* Allow NOMMU mmap() to directly map the device (if not NULL)
	60	* - return the address to which the offset maps
	61	* - return -ENOSYS to indicate refusal to do the mapping
	62	*/
	63	static unsigned long maprom_unmapped_area(struct mtd_info *mtd,
	64	unsigned long len,
	65	unsigned long offset,
	66	unsigned long flags)
	67	{
	68	struct map_info *map = mtd->priv;
	69	return (unsigned long) map->virt + offset;
	70	}
	71
1da177e4 LT	72	static int maprom_read (struct mtd_info mtd, loff_t from, size_t len, size_t retlen, u_char *buf)
	73	{
	74	struct map_info *map = mtd->priv;
	75
	76	map_copy_from(map, buf, from, len);
	77	*retlen = len;
	78	return 0;
	79	}
	80
	81	static void maprom_nop(struct mtd_info *mtd)
	82	{
	83	/* Nothing to see here */
	84	}
	85
	86	static int maprom_write (struct mtd_info mtd, loff_t to, size_t len, size_t retlen, const u_char *buf)
	87	{
664addc2	88	return -EROFS;
1da177e4 LT	89	}
1da177e4 LT	90
5f877607 AC	91	static int maprom_erase (struct mtd_info mtd, struct erase_info info)
	92	{
	93	/* We do our best 8) */
	94	return -EROFS;
	95	}
	96
1da177e4 LT	97	static int __init map_rom_init(void)
	98	{
	99	register_mtd_chip_driver(&maprom_chipdrv);
	100	return 0;
	101	}
	102
	103	static void __exit map_rom_exit(void)
	104	{
	105	unregister_mtd_chip_driver(&maprom_chipdrv);
	106	}
	107
	108	module_init(map_rom_init);
	109	module_exit(map_rom_exit);
	110
	111	MODULE_LICENSE("GPL");
	112	MODULE_AUTHOR("David Woodhouse <[email protected]>");
	113	MODULE_DESCRIPTION("MTD chip driver for ROM chips");