[mirror_ubuntu-artful-kernel.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/of.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 unsigned int default_erasesize(struct map_info *map)
{
	const __be32 *erase_size = NULL;

	erase_size = of_get_property(map->device_node, "erase-size", NULL);

	return !erase_size ? map->size : be32_to_cpu(*erase_size);
}

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 = default_erasesize(map);
	mtd->writesize = 1;
	mtd->writebufsize = 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 <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>
6958024a	14	#include <linux/of.h>
1da177e4 LT	15	#include <linux/mtd/mtd.h>
1da177e4 LT	16	#include <linux/mtd/map.h>
1da177e4 LT	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
6958024a AS	32	static unsigned int default_erasesize(struct map_info *map)
	33	{
	34	const __be32 *erase_size = NULL;
	35
	36	erase_size = of_get_property(map->device_node, "erase-size", NULL);
	37
	38	return !erase_size ? map->size : be32_to_cpu(*erase_size);
	39	}
	40
1da177e4 LT	41	static struct mtd_info map_rom_probe(struct map_info map)
	42	{
	43	struct mtd_info *mtd;
	44
95b93a0c	45	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
1da177e4 LT	46	if (!mtd)
	47	return NULL;
	48
1da177e4 LT	49	map->fldrv = &maprom_chipdrv;
	50	mtd->priv = map;
	51	mtd->name = map->name;
21c8db9e	52	mtd->type = MTD_ROM;
1da177e4	53	mtd->size = map->size;
3c3c10bb AB	54	mtd->_get_unmapped_area = maprom_unmapped_area;
	55	mtd->_read = maprom_read;
	56	mtd->_write = maprom_write;
	57	mtd->_sync = maprom_nop;
	58	mtd->_erase = maprom_erase;
1da177e4	59	mtd->flags = MTD_CAP_ROM;
6958024a	60	mtd->erasesize = default_erasesize(map);
17ffc7ba	61	mtd->writesize = 1;
6958024a	62	mtd->writebufsize = 1;
1da177e4 LT	63
	64	__module_get(THIS_MODULE);
	65	return mtd;
	66	}
	67
	68
402d3265 DH	69	/*
	70	* Allow NOMMU mmap() to directly map the device (if not NULL)
	71	* - return the address to which the offset maps
	72	* - return -ENOSYS to indicate refusal to do the mapping
	73	*/
	74	static unsigned long maprom_unmapped_area(struct mtd_info *mtd,
	75	unsigned long len,
	76	unsigned long offset,
	77	unsigned long flags)
	78	{
	79	struct map_info *map = mtd->priv;
	80	return (unsigned long) map->virt + offset;
	81	}
	82
1da177e4 LT	83	static int maprom_read (struct mtd_info mtd, loff_t from, size_t len, size_t retlen, u_char *buf)
	84	{
	85	struct map_info *map = mtd->priv;
	86
	87	map_copy_from(map, buf, from, len);
	88	*retlen = len;
	89	return 0;
	90	}
	91
	92	static void maprom_nop(struct mtd_info *mtd)
	93	{
	94	/* Nothing to see here */
	95	}
	96
	97	static int maprom_write (struct mtd_info mtd, loff_t to, size_t len, size_t retlen, const u_char *buf)
	98	{
664addc2	99	return -EROFS;
1da177e4 LT	100	}
1da177e4 LT	101
5f877607 AC	102	static int maprom_erase (struct mtd_info mtd, struct erase_info info)
	103	{
	104	/* We do our best 8) */
	105	return -EROFS;
	106	}
	107
1da177e4 LT	108	static int __init map_rom_init(void)
	109	{
	110	register_mtd_chip_driver(&maprom_chipdrv);
	111	return 0;
	112	}
	113
	114	static void __exit map_rom_exit(void)
	115	{
	116	unregister_mtd_chip_driver(&maprom_chipdrv);
	117	}
	118
	119	module_init(map_rom_init);
	120	module_exit(map_rom_exit);
	121
	122	MODULE_LICENSE("GPL");
	123	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	124	MODULE_DESCRIPTION("MTD chip driver for ROM chips");