[deliverable/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>
#include <linux/mtd/compatmac.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)
{
	printk(KERN_NOTICE "maprom_write called\n");
	return -EIO;
}

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 <dwmw2@infradead.org>");
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>
	16	#include <linux/mtd/compatmac.h>
	17
	18	static int maprom_read (struct mtd_info , loff_t, size_t, size_t , u_char *);
	19	static int maprom_write (struct mtd_info , loff_t, size_t, size_t , const u_char *);
	20	static void maprom_nop (struct mtd_info *);
	21	static struct mtd_info map_rom_probe(struct map_info map);
5f877607	22	static int maprom_erase (struct mtd_info mtd, struct erase_info info);
402d3265 DH	23	static unsigned long maprom_unmapped_area(struct mtd_info *, unsigned long,
402d3265 DH	24	unsigned long, unsigned long);
1da177e4 LT	25
	26	static struct mtd_chip_driver maprom_chipdrv = {
	27	.probe = map_rom_probe,
	28	.name = "map_rom",
	29	.module = THIS_MODULE
	30	};
	31
	32	static struct mtd_info map_rom_probe(struct map_info map)
	33	{
	34	struct mtd_info *mtd;
	35
95b93a0c	36	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
1da177e4 LT	37	if (!mtd)
	38	return NULL;
	39
1da177e4 LT	40	map->fldrv = &maprom_chipdrv;
	41	mtd->priv = map;
	42	mtd->name = map->name;
21c8db9e	43	mtd->type = MTD_ROM;
1da177e4	44	mtd->size = map->size;
402d3265	45	mtd->get_unmapped_area = maprom_unmapped_area;
1da177e4 LT	46	mtd->read = maprom_read;
	47	mtd->write = maprom_write;
	48	mtd->sync = maprom_nop;
5f877607	49	mtd->erase = maprom_erase;
1da177e4	50	mtd->flags = MTD_CAP_ROM;
e369d62e	51	mtd->erasesize = map->size;
17ffc7ba	52	mtd->writesize = 1;
1da177e4 LT	53
	54	__module_get(THIS_MODULE);
	55	return mtd;
	56	}
	57
	58
402d3265 DH	59	/*
	60	* Allow NOMMU mmap() to directly map the device (if not NULL)
	61	* - return the address to which the offset maps
	62	* - return -ENOSYS to indicate refusal to do the mapping
	63	*/
	64	static unsigned long maprom_unmapped_area(struct mtd_info *mtd,
	65	unsigned long len,
	66	unsigned long offset,
	67	unsigned long flags)
	68	{
	69	struct map_info *map = mtd->priv;
	70	return (unsigned long) map->virt + offset;
	71	}
	72
1da177e4 LT	73	static int maprom_read (struct mtd_info mtd, loff_t from, size_t len, size_t retlen, u_char *buf)
	74	{
	75	struct map_info *map = mtd->priv;
	76
	77	map_copy_from(map, buf, from, len);
	78	*retlen = len;
	79	return 0;
	80	}
	81
	82	static void maprom_nop(struct mtd_info *mtd)
	83	{
	84	/* Nothing to see here */
	85	}
	86
	87	static int maprom_write (struct mtd_info mtd, loff_t to, size_t len, size_t retlen, const u_char *buf)
	88	{
	89	printk(KERN_NOTICE "maprom_write called\n");
	90	return -EIO;
	91	}
	92
5f877607 AC	93	static int maprom_erase (struct mtd_info mtd, struct erase_info info)
	94	{
	95	/* We do our best 8) */
	96	return -EROFS;
	97	}
	98
1da177e4 LT	99	static int __init map_rom_init(void)
	100	{
	101	register_mtd_chip_driver(&maprom_chipdrv);
	102	return 0;
	103	}
	104
	105	static void __exit map_rom_exit(void)
	106	{
	107	unregister_mtd_chip_driver(&maprom_chipdrv);
	108	}
	109
	110	module_init(map_rom_init);
	111	module_exit(map_rom_exit);
	112
	113	MODULE_LICENSE("GPL");
	114	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	115	MODULE_DESCRIPTION("MTD chip driver for ROM chips");