109 строки
2.5 KiB
C
109 строки
2.5 KiB
C
/*
|
|
* tsunami_flash.c
|
|
*
|
|
* flash chip on alpha ds10...
|
|
* $Id: tsunami_flash.c,v 1.10 2005/11/07 11:14:29 gleixner Exp $
|
|
*/
|
|
#include <asm/io.h>
|
|
#include <asm/core_tsunami.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/mtd.h>
|
|
|
|
#define FLASH_ENABLE_PORT 0x00C00001
|
|
#define FLASH_ENABLE_BYTE 0x01
|
|
#define FLASH_DISABLE_BYTE 0x00
|
|
|
|
#define MAX_TIG_FLASH_SIZE (12*1024*1024)
|
|
static inline map_word tsunami_flash_read8(struct map_info *map, unsigned long offset)
|
|
{
|
|
map_word val;
|
|
val.x[0] = tsunami_tig_readb(offset);
|
|
return val;
|
|
}
|
|
|
|
static void tsunami_flash_write8(struct map_info *map, map_word value, unsigned long offset)
|
|
{
|
|
tsunami_tig_writeb(value.x[0], offset);
|
|
}
|
|
|
|
static void tsunami_flash_copy_from(
|
|
struct map_info *map, void *addr, unsigned long offset, ssize_t len)
|
|
{
|
|
unsigned char *dest;
|
|
dest = addr;
|
|
while(len && (offset < MAX_TIG_FLASH_SIZE)) {
|
|
*dest = tsunami_tig_readb(offset);
|
|
offset++;
|
|
dest++;
|
|
len--;
|
|
}
|
|
}
|
|
|
|
static void tsunami_flash_copy_to(
|
|
struct map_info *map, unsigned long offset,
|
|
const void *addr, ssize_t len)
|
|
{
|
|
const unsigned char *src;
|
|
src = addr;
|
|
while(len && (offset < MAX_TIG_FLASH_SIZE)) {
|
|
tsunami_tig_writeb(*src, offset);
|
|
offset++;
|
|
src++;
|
|
len--;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Deliberately don't provide operations wider than 8 bits. I don't
|
|
* have then and it scares me to think how you could mess up if
|
|
* you tried to use them. Buswidth is correctly so I'm safe.
|
|
*/
|
|
static struct map_info tsunami_flash_map = {
|
|
.name = "flash chip on the Tsunami TIG bus",
|
|
.size = MAX_TIG_FLASH_SIZE,
|
|
.phys = NO_XIP,
|
|
.bankwidth = 1,
|
|
.read = tsunami_flash_read8,
|
|
.copy_from = tsunami_flash_copy_from,
|
|
.write = tsunami_flash_write8,
|
|
.copy_to = tsunami_flash_copy_to,
|
|
};
|
|
|
|
static struct mtd_info *tsunami_flash_mtd;
|
|
|
|
static void __exit cleanup_tsunami_flash(void)
|
|
{
|
|
struct mtd_info *mtd;
|
|
mtd = tsunami_flash_mtd;
|
|
if (mtd) {
|
|
del_mtd_device(mtd);
|
|
map_destroy(mtd);
|
|
}
|
|
tsunami_flash_mtd = 0;
|
|
}
|
|
|
|
|
|
static int __init init_tsunami_flash(void)
|
|
{
|
|
static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
|
|
char **type;
|
|
|
|
tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT);
|
|
|
|
tsunami_flash_mtd = 0;
|
|
type = rom_probe_types;
|
|
for(; !tsunami_flash_mtd && *type; type++) {
|
|
tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map);
|
|
}
|
|
if (tsunami_flash_mtd) {
|
|
tsunami_flash_mtd->owner = THIS_MODULE;
|
|
add_mtd_device(tsunami_flash_mtd);
|
|
return 0;
|
|
}
|
|
return -ENXIO;
|
|
}
|
|
|
|
module_init(init_tsunami_flash);
|
|
module_exit(cleanup_tsunami_flash);
|