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/* Overhauled routines for dealing with different mmap regions of flash */
/* $Id: map.h,v 1.25 2001/09/09 15:04:17 dwmw2 Exp $ */
#ifndef __LINUX_MTD_MAP_H__
#define __LINUX_MTD_MAP_H__
#include <linux/config.h>
#include <linux/types.h>
#include <linux/mtd/mtd.h>
#include <linux/slab.h>
#ifdef CONFIG_MTD_CFI_B1
#define map_bankwidth(map) 1
#define map_bankwidth_is_1(map) (map_bankwidth(map) == 1)
#define MAX_MAP_BANKWIDTH 1
#else
#define map_bankwidth_is_1(map) (0)
#endif
#ifdef CONFIG_MTD_CFI_B2
# ifdef map_bankwidth
# undef map_bankwidth
# define map_bankwidth(map) ((map)->bankwidth)
# else
# define map_bankwidth(map) 2
# endif
#define map_bankwidth_is_2(map) (map_bankwidth(map) == 2)
#undef MAX_MAP_BANKWIDTH
#define MAX_MAP_BANKWIDTH 2
#else
#define map_bankwidth_is_2(map) (0)
#endif
#ifdef CONFIG_MTD_CFI_B4
# ifdef map_bankwidth
# undef map_bankwidth
# define map_bankwidth(map) ((map)->bankwidth)
# else
# define map_bankwidth(map) 4
# endif
#define map_bankwidth_is_4(map) (map_bankwidth(map) == 4)
#undef MAX_MAP_BANKWIDTH
#define MAX_MAP_BANKWIDTH 4
#else
#define map_bankwidth_is_4(map) (0)
#endif
#define MAX_MAP_LONGS ( ((MAX_MAP_BANKWIDTH*8) + BITS_PER_LONG - 1) / BITS_PER_LONG )
typedef union {
unsigned long x[MAX_MAP_LONGS];
} map_word;
/* The map stuff is very simple. You fill in your struct map_info with
a handful of routines for accessing the device, making sure they handle
paging etc. correctly if your device needs it. Then you pass it off
to a chip driver which deals with a mapped device - generally either
do_cfi_probe() or do_ram_probe(), either of which will return a
struct mtd_info if they liked what they saw. At which point, you
fill in the mtd->module with your own module address, and register
it.
The mtd->priv field will point to the struct map_info, and any further
private data required by the chip driver is linked from the
mtd->priv->fldrv_priv field. This allows the map driver to get at
the destructor function map->fldrv_destroy() when it's tired
of living.
*/
struct map_info {
char *name;
unsigned long size;
int buswidth; /* in octets */
__u8 (*read8)(struct map_info *, unsigned long);
__u16 (*read16)(struct map_info *, unsigned long);
__u32 (*read32)(struct map_info *, unsigned long);
/* If it returned a 'long' I'd call it readl.
* It doesn't.
* I won't.
* dwmw2 */
map_word (*read)(struct map_info *, unsigned long);
void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t);
void (*write8)(struct map_info *, __u8, unsigned long);
void (*write16)(struct map_info *, __u16, unsigned long);
void (*write32)(struct map_info *, __u32, unsigned long);
void (*write)(struct map_info *, const map_word, unsigned long);
void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t);
void (*set_vpp)(struct map_info *, int);
/* We put these two here rather than a single void *map_priv,
because we want mappers to be able to have quickly-accessible
cache for the 'currently-mapped page' without the _extra_
redirection that would be necessary. If you need more than
two longs, turn the second into a pointer. dwmw2 */
unsigned long map_priv_1;
unsigned long map_priv_2;
void *fldrv_priv;
struct mtd_chip_driver *fldrv;
};
struct mtd_chip_driver {
struct mtd_info *(*probe)(struct map_info *map);
void (*destroy)(struct mtd_info *);
struct module *module;
char *name;
struct list_head list;
};
void register_mtd_chip_driver(struct mtd_chip_driver *);
void unregister_mtd_chip_driver(struct mtd_chip_driver *);
struct mtd_info *do_map_probe(char *name, struct map_info *map);
/*
* Destroy an MTD device which was created for a map device.
* Make sure the MTD device is already unregistered before calling this
*/
static inline void map_destroy(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
if (map->fldrv->destroy)
map->fldrv->destroy(mtd);
#ifdef CONFIG_MODULES
if (map->fldrv->module)
__MOD_DEC_USE_COUNT(map->fldrv->module);
#endif
kfree(mtd);
}
#define ENABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 1); } while(0)
#define DISABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 0); } while(0)
#endif /* __LINUX_MTD_MAP_H__ */
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