489 lines
13 KiB
C
489 lines
13 KiB
C
/*
|
|
* Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org> et al.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
/* Overhauled routines for dealing with different mmap regions of flash */
|
|
|
|
#ifndef __LINUX_MTD_MAP_H__
|
|
#define __LINUX_MTD_MAP_H__
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/list.h>
|
|
#include <linux/string.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/unaligned.h>
|
|
#include <asm/barrier.h>
|
|
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
|
|
#define map_bankwidth(map) 1
|
|
#define map_bankwidth_is_1(map) (map_bankwidth(map) == 1)
|
|
#define map_bankwidth_is_large(map) (0)
|
|
#define map_words(map) (1)
|
|
#define MAX_MAP_BANKWIDTH 1
|
|
#else
|
|
#define map_bankwidth_is_1(map) (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
|
|
# ifdef map_bankwidth
|
|
# undef map_bankwidth
|
|
# define map_bankwidth(map) ((map)->bankwidth)
|
|
# else
|
|
# define map_bankwidth(map) 2
|
|
# define map_bankwidth_is_large(map) (0)
|
|
# define map_words(map) (1)
|
|
# 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_MAP_BANK_WIDTH_4
|
|
# ifdef map_bankwidth
|
|
# undef map_bankwidth
|
|
# define map_bankwidth(map) ((map)->bankwidth)
|
|
# else
|
|
# define map_bankwidth(map) 4
|
|
# define map_bankwidth_is_large(map) (0)
|
|
# define map_words(map) (1)
|
|
# 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
|
|
|
|
/* ensure we never evaluate anything shorted than an unsigned long
|
|
* to zero, and ensure we'll never miss the end of an comparison (bjd) */
|
|
|
|
#define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1)) / sizeof(unsigned long))
|
|
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
|
|
# ifdef map_bankwidth
|
|
# undef map_bankwidth
|
|
# define map_bankwidth(map) ((map)->bankwidth)
|
|
# if BITS_PER_LONG < 64
|
|
# undef map_bankwidth_is_large
|
|
# define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
|
|
# undef map_words
|
|
# define map_words(map) map_calc_words(map)
|
|
# endif
|
|
# else
|
|
# define map_bankwidth(map) 8
|
|
# define map_bankwidth_is_large(map) (BITS_PER_LONG < 64)
|
|
# define map_words(map) map_calc_words(map)
|
|
# endif
|
|
#define map_bankwidth_is_8(map) (map_bankwidth(map) == 8)
|
|
#undef MAX_MAP_BANKWIDTH
|
|
#define MAX_MAP_BANKWIDTH 8
|
|
#else
|
|
#define map_bankwidth_is_8(map) (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
|
|
# ifdef map_bankwidth
|
|
# undef map_bankwidth
|
|
# define map_bankwidth(map) ((map)->bankwidth)
|
|
# undef map_bankwidth_is_large
|
|
# define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
|
|
# undef map_words
|
|
# define map_words(map) map_calc_words(map)
|
|
# else
|
|
# define map_bankwidth(map) 16
|
|
# define map_bankwidth_is_large(map) (1)
|
|
# define map_words(map) map_calc_words(map)
|
|
# endif
|
|
#define map_bankwidth_is_16(map) (map_bankwidth(map) == 16)
|
|
#undef MAX_MAP_BANKWIDTH
|
|
#define MAX_MAP_BANKWIDTH 16
|
|
#else
|
|
#define map_bankwidth_is_16(map) (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
|
|
# ifdef map_bankwidth
|
|
# undef map_bankwidth
|
|
# define map_bankwidth(map) ((map)->bankwidth)
|
|
# undef map_bankwidth_is_large
|
|
# define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
|
|
# undef map_words
|
|
# define map_words(map) map_calc_words(map)
|
|
# else
|
|
# define map_bankwidth(map) 32
|
|
# define map_bankwidth_is_large(map) (1)
|
|
# define map_words(map) map_calc_words(map)
|
|
# endif
|
|
#define map_bankwidth_is_32(map) (map_bankwidth(map) == 32)
|
|
#undef MAX_MAP_BANKWIDTH
|
|
#define MAX_MAP_BANKWIDTH 32
|
|
#else
|
|
#define map_bankwidth_is_32(map) (0)
|
|
#endif
|
|
|
|
#ifndef map_bankwidth
|
|
#ifdef CONFIG_MTD
|
|
#warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work"
|
|
#endif
|
|
static inline int map_bankwidth(void *map)
|
|
{
|
|
BUG();
|
|
return 0;
|
|
}
|
|
#define map_bankwidth_is_large(map) (0)
|
|
#define map_words(map) (0)
|
|
#define MAX_MAP_BANKWIDTH 1
|
|
#endif
|
|
|
|
static inline int map_bankwidth_supported(int w)
|
|
{
|
|
switch (w) {
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
|
|
case 1:
|
|
#endif
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
|
|
case 2:
|
|
#endif
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
|
|
case 4:
|
|
#endif
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
|
|
case 8:
|
|
#endif
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
|
|
case 16:
|
|
#endif
|
|
#ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
|
|
case 32:
|
|
#endif
|
|
return 1;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
#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 probe routine -- either JEDEC or CFI probe or both -- via
|
|
do_map_probe(). If a chip is recognised, the probe code will invoke the
|
|
appropriate chip driver (if present) and return a struct mtd_info.
|
|
At which point, you fill in the mtd->module with your own module
|
|
address, and register it with the MTD core code. Or you could partition
|
|
it and register the partitions instead, or keep it for your own private
|
|
use; whatever.
|
|
|
|
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 {
|
|
const char *name;
|
|
unsigned long size;
|
|
resource_size_t phys;
|
|
#define NO_XIP (-1UL)
|
|
|
|
void __iomem *virt;
|
|
void *cached;
|
|
|
|
int swap; /* this mapping's byte-swapping requirement */
|
|
int bankwidth; /* in octets. This isn't necessarily the width
|
|
of actual bus cycles -- it's the repeat interval
|
|
in bytes, before you are talking to the first chip again.
|
|
*/
|
|
|
|
#ifdef CONFIG_MTD_COMPLEX_MAPPINGS
|
|
map_word (*read)(struct map_info *, unsigned long);
|
|
void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t);
|
|
|
|
void (*write)(struct map_info *, const map_word, unsigned long);
|
|
void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t);
|
|
|
|
/* We can perhaps put in 'point' and 'unpoint' methods, if we really
|
|
want to enable XIP for non-linear mappings. Not yet though. */
|
|
#endif
|
|
/* It's possible for the map driver to use cached memory in its
|
|
copy_from implementation (and _only_ with copy_from). However,
|
|
when the chip driver knows some flash area has changed contents,
|
|
it will signal it to the map driver through this routine to let
|
|
the map driver invalidate the corresponding cache as needed.
|
|
If there is no cache to care about this can be set to NULL. */
|
|
void (*inval_cache)(struct map_info *, unsigned long, ssize_t);
|
|
|
|
/* set_vpp() must handle being reentered -- enable, enable, disable
|
|
must leave it enabled. */
|
|
void (*set_vpp)(struct map_info *, int);
|
|
|
|
unsigned long pfow_base;
|
|
unsigned long map_priv_1;
|
|
unsigned long map_priv_2;
|
|
struct device_node *device_node;
|
|
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);
|
|
void map_destroy(struct mtd_info *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)
|
|
|
|
#define INVALIDATE_CACHED_RANGE(map, from, size) \
|
|
do { if (map->inval_cache) map->inval_cache(map, from, size); } while (0)
|
|
|
|
|
|
static inline int map_word_equal(struct map_info *map, map_word val1, map_word val2)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < map_words(map); i++) {
|
|
if (val1.x[i] != val2.x[i])
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static inline map_word map_word_and(struct map_info *map, map_word val1, map_word val2)
|
|
{
|
|
map_word r;
|
|
int i;
|
|
|
|
for (i = 0; i < map_words(map); i++)
|
|
r.x[i] = val1.x[i] & val2.x[i];
|
|
|
|
return r;
|
|
}
|
|
|
|
static inline map_word map_word_clr(struct map_info *map, map_word val1, map_word val2)
|
|
{
|
|
map_word r;
|
|
int i;
|
|
|
|
for (i = 0; i < map_words(map); i++)
|
|
r.x[i] = val1.x[i] & ~val2.x[i];
|
|
|
|
return r;
|
|
}
|
|
|
|
static inline map_word map_word_or(struct map_info *map, map_word val1, map_word val2)
|
|
{
|
|
map_word r;
|
|
int i;
|
|
|
|
for (i = 0; i < map_words(map); i++)
|
|
r.x[i] = val1.x[i] | val2.x[i];
|
|
|
|
return r;
|
|
}
|
|
|
|
static inline int map_word_andequal(struct map_info *map, map_word val1, map_word val2, map_word val3)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < map_words(map); i++) {
|
|
if ((val1.x[i] & val2.x[i]) != val3.x[i])
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < map_words(map); i++) {
|
|
if (val1.x[i] & val2.x[i])
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline map_word map_word_load(struct map_info *map, const void *ptr)
|
|
{
|
|
map_word r;
|
|
|
|
if (map_bankwidth_is_1(map))
|
|
r.x[0] = *(unsigned char *)ptr;
|
|
else if (map_bankwidth_is_2(map))
|
|
r.x[0] = get_unaligned((uint16_t *)ptr);
|
|
else if (map_bankwidth_is_4(map))
|
|
r.x[0] = get_unaligned((uint32_t *)ptr);
|
|
#if BITS_PER_LONG >= 64
|
|
else if (map_bankwidth_is_8(map))
|
|
r.x[0] = get_unaligned((uint64_t *)ptr);
|
|
#endif
|
|
else if (map_bankwidth_is_large(map))
|
|
memcpy(r.x, ptr, map->bankwidth);
|
|
else
|
|
BUG();
|
|
|
|
return r;
|
|
}
|
|
|
|
static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len)
|
|
{
|
|
int i;
|
|
|
|
if (map_bankwidth_is_large(map)) {
|
|
char *dest = (char *)&orig;
|
|
|
|
memcpy(dest+start, buf, len);
|
|
} else {
|
|
for (i = start; i < start+len; i++) {
|
|
int bitpos;
|
|
|
|
#ifdef __LITTLE_ENDIAN
|
|
bitpos = i * 8;
|
|
#else /* __BIG_ENDIAN */
|
|
bitpos = (map_bankwidth(map) - 1 - i) * 8;
|
|
#endif
|
|
orig.x[0] &= ~(0xff << bitpos);
|
|
orig.x[0] |= (unsigned long)buf[i-start] << bitpos;
|
|
}
|
|
}
|
|
return orig;
|
|
}
|
|
|
|
#if BITS_PER_LONG < 64
|
|
#define MAP_FF_LIMIT 4
|
|
#else
|
|
#define MAP_FF_LIMIT 8
|
|
#endif
|
|
|
|
static inline map_word map_word_ff(struct map_info *map)
|
|
{
|
|
map_word r;
|
|
int i;
|
|
|
|
if (map_bankwidth(map) < MAP_FF_LIMIT) {
|
|
int bw = 8 * map_bankwidth(map);
|
|
|
|
r.x[0] = (1UL << bw) - 1;
|
|
} else {
|
|
for (i = 0; i < map_words(map); i++)
|
|
r.x[i] = ~0UL;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
|
|
{
|
|
map_word r;
|
|
|
|
if (map_bankwidth_is_1(map))
|
|
r.x[0] = __raw_readb(map->virt + ofs);
|
|
else if (map_bankwidth_is_2(map))
|
|
r.x[0] = __raw_readw(map->virt + ofs);
|
|
else if (map_bankwidth_is_4(map))
|
|
r.x[0] = __raw_readl(map->virt + ofs);
|
|
#if BITS_PER_LONG >= 64
|
|
else if (map_bankwidth_is_8(map))
|
|
r.x[0] = __raw_readq(map->virt + ofs);
|
|
#endif
|
|
else if (map_bankwidth_is_large(map))
|
|
memcpy_fromio(r.x, map->virt + ofs, map->bankwidth);
|
|
else
|
|
BUG();
|
|
|
|
return r;
|
|
}
|
|
|
|
static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs)
|
|
{
|
|
if (map_bankwidth_is_1(map))
|
|
__raw_writeb(datum.x[0], map->virt + ofs);
|
|
else if (map_bankwidth_is_2(map))
|
|
__raw_writew(datum.x[0], map->virt + ofs);
|
|
else if (map_bankwidth_is_4(map))
|
|
__raw_writel(datum.x[0], map->virt + ofs);
|
|
#if BITS_PER_LONG >= 64
|
|
else if (map_bankwidth_is_8(map))
|
|
__raw_writeq(datum.x[0], map->virt + ofs);
|
|
#endif
|
|
else if (map_bankwidth_is_large(map))
|
|
memcpy_toio(map->virt+ofs, datum.x, map->bankwidth);
|
|
else
|
|
BUG();
|
|
mb();
|
|
}
|
|
|
|
static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
|
|
{
|
|
if (map->cached)
|
|
memcpy(to, (char *)map->cached + from, len);
|
|
else
|
|
memcpy_fromio(to, map->virt + from, len);
|
|
}
|
|
|
|
static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
|
|
{
|
|
memcpy_toio(map->virt + to, from, len);
|
|
}
|
|
|
|
#ifdef CONFIG_MTD_COMPLEX_MAPPINGS
|
|
#define map_read(map, ofs) (map)->read(map, ofs)
|
|
#define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len)
|
|
#define map_write(map, datum, ofs) (map)->write(map, datum, ofs)
|
|
#define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len)
|
|
|
|
extern void simple_map_init(struct map_info *);
|
|
#define map_is_linear(map) (map->phys != NO_XIP)
|
|
|
|
#else
|
|
#define map_read(map, ofs) inline_map_read(map, ofs)
|
|
#define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len)
|
|
#define map_write(map, datum, ofs) inline_map_write(map, datum, ofs)
|
|
#define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len)
|
|
|
|
|
|
#define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth))
|
|
#define map_is_linear(map) ({ (void)(map); 1; })
|
|
|
|
#endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */
|
|
|
|
#endif /* __LINUX_MTD_MAP_H__ */
|