map.h
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上传日期:2013-02-24
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- /* Overhauled routines for dealing with different mmap regions of flash */
- /* $Id: map.h,v 1.27 2002/02/21 08:26:59 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>
- /* 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);
- __u64 (*read64)(struct map_info *, unsigned long);
- /* If it returned a 'long' I'd call it readl.
- * It doesn't.
- * I won't.
- * dwmw2 */
-
- 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 (*write64)(struct map_info *, __u64, 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(const 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)
- extern __u8 mtd_generic_read8(struct map_info *map, unsigned long ofs);
- extern __u16 mtd_generic_read16(struct map_info *map, unsigned long ofs);
- extern __u32 mtd_generic_read32(struct map_info *map, unsigned long ofs);
- extern void mtd_generic_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len);
- extern void mtd_generic_write8(struct map_info *map, __u8 d, unsigned long adr);
- extern void mtd_generic_write16(struct map_info *map, __u16 d, unsigned long adr);
- extern void mtd_generic_write32(struct map_info *map, __u32 d, unsigned long adr);
- extern void mtd_generic_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len);
- #endif /* __LINUX_MTD_MAP_H__ */