1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/* Overhauled routines for dealing with different mmap regions of flash */
/* $Id: map.h,v 1.5 2000/06/26 16:18:58 dwmw2 Exp $ */
#ifndef __LINUX_MTD_MAP_H__
#define __LINUX_MTD_MAP_H__
#include <linux/types.h>
#include <linux/mtd/mtd.h>
#include <linux/kmod.h>
#include <linux/malloc.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);
/* 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 (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t);
/* 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;
void (*fldrv_destroy)(struct mtd_info *);
};
/*
* Probe for the contents of a map device and make an MTD structure
* if anything is recognised. Doesn't register it because the calling
* map driver needs to set the 'module' field first.
*/
static inline struct mtd_info *do_map_probe(struct map_info *map, char *funcname, char *modname)
{
struct mtd_info *(*probe_p)(struct map_info *);
struct mtd_info *mtd = NULL;
probe_p = (void *)get_module_symbol(NULL, funcname);
if (!probe_p) {
request_module(modname);
probe_p = (void *)get_module_symbol(NULL, funcname);
}
if (probe_p) {
mtd = (*probe_p)(map);
put_module_symbol((unsigned long)probe_p);
}
return mtd;
}
/*
* Commonly-used probe functions for different types of chip.
*/
#define do_cfi_probe(x) do_map_probe(x, "cfi_probe", "cfi_probe")
#define do_jedec_probe(x) do_map_probe(x, "jedec_probe", "jedec_probe")
#define do_ram_probe(x) do_map_probe(x, "map_ram_probe", "map_ram")
#define do_rom_probe(x) do_map_probe(x, "map_rom_probe", "map_rom")
/*
* 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;
map->fldrv_destroy(mtd);
put_module_symbol((unsigned long)map->fldrv_destroy);
kfree(mtd);
}
#endif /* __LINUX_MTD_MAP_H__ */
|
