1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
187 lines
4.8 KiB
C
187 lines
4.8 KiB
C
/*
|
|
* Flash memory access on Alchemy Db1550 board
|
|
*
|
|
* $Id: db1550-flash.c,v 1.7 2004/11/04 13:24:14 gleixner Exp $
|
|
*
|
|
* (C) 2004 Embedded Edge, LLC, based on db1550-flash.c:
|
|
* (C) 2003, 2004 Pete Popov <ppopov@embeddedalley.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/partitions.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
#ifdef DEBUG_RW
|
|
#define DBG(x...) printk(x)
|
|
#else
|
|
#define DBG(x...)
|
|
#endif
|
|
|
|
static unsigned long window_addr;
|
|
static unsigned long window_size;
|
|
|
|
|
|
static struct map_info db1550_map = {
|
|
.name = "Db1550 flash",
|
|
};
|
|
|
|
static unsigned char flash_bankwidth = 4;
|
|
|
|
/*
|
|
* Support only 64MB NOR Flash parts
|
|
*/
|
|
|
|
#if defined(CONFIG_MTD_DB1550_BOOT) && defined(CONFIG_MTD_DB1550_USER)
|
|
#define DB1550_BOTH_BANKS
|
|
#elif defined(CONFIG_MTD_DB1550_BOOT) && !defined(CONFIG_MTD_DB1550_USER)
|
|
#define DB1550_BOOT_ONLY
|
|
#elif !defined(CONFIG_MTD_DB1550_BOOT) && defined(CONFIG_MTD_DB1550_USER)
|
|
#define DB1550_USER_ONLY
|
|
#endif
|
|
|
|
#ifdef DB1550_BOTH_BANKS
|
|
/* both banks will be used. Combine the first bank and the first
|
|
* part of the second bank together into a single jffs/jffs2
|
|
* partition.
|
|
*/
|
|
static struct mtd_partition db1550_partitions[] = {
|
|
/* assume boot[2:0]:swap is '0000' or '1000', which translates to:
|
|
* 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash
|
|
* 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash
|
|
*/
|
|
{
|
|
.name = "User FS",
|
|
.size = (0x1FC00000 - 0x18000000),
|
|
.offset = 0x0000000
|
|
},{
|
|
.name = "yamon",
|
|
.size = 0x0100000,
|
|
.offset = MTDPART_OFS_APPEND,
|
|
.mask_flags = MTD_WRITEABLE
|
|
},{
|
|
.name = "raw kernel",
|
|
.size = (0x300000 - 0x40000), /* last 256KB is yamon env */
|
|
.offset = MTDPART_OFS_APPEND,
|
|
}
|
|
};
|
|
#elif defined(DB1550_BOOT_ONLY)
|
|
static struct mtd_partition db1550_partitions[] = {
|
|
/* assume boot[2:0]:swap is '0000' or '1000', which translates to:
|
|
* 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash
|
|
*/
|
|
{
|
|
.name = "User FS",
|
|
.size = 0x03c00000,
|
|
.offset = 0x0000000
|
|
},{
|
|
.name = "yamon",
|
|
.size = 0x0100000,
|
|
.offset = MTDPART_OFS_APPEND,
|
|
.mask_flags = MTD_WRITEABLE
|
|
},{
|
|
.name = "raw kernel",
|
|
.size = (0x300000-0x40000), /* last 256KB is yamon env */
|
|
.offset = MTDPART_OFS_APPEND,
|
|
}
|
|
};
|
|
#elif defined(DB1550_USER_ONLY)
|
|
static struct mtd_partition db1550_partitions[] = {
|
|
/* assume boot[2:0]:swap is '0000' or '1000', which translates to:
|
|
* 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash
|
|
*/
|
|
{
|
|
.name = "User FS",
|
|
.size = (0x4000000 - 0x200000), /* reserve 2MB for raw kernel */
|
|
.offset = 0x0000000
|
|
},{
|
|
.name = "raw kernel",
|
|
.size = MTDPART_SIZ_FULL,
|
|
.offset = MTDPART_OFS_APPEND,
|
|
}
|
|
};
|
|
#else
|
|
#error MTD_DB1550 define combo error /* should never happen */
|
|
#endif
|
|
|
|
#define NB_OF(x) (sizeof(x)/sizeof(x[0]))
|
|
|
|
static struct mtd_info *mymtd;
|
|
|
|
/*
|
|
* Probe the flash density and setup window address and size
|
|
* based on user CONFIG options. There are times when we don't
|
|
* want the MTD driver to be probing the boot or user flash,
|
|
* so having the option to enable only one bank is important.
|
|
*/
|
|
int setup_flash_params(void)
|
|
{
|
|
#if defined(DB1550_BOTH_BANKS)
|
|
window_addr = 0x18000000;
|
|
window_size = 0x8000000;
|
|
#elif defined(DB1550_BOOT_ONLY)
|
|
window_addr = 0x1C000000;
|
|
window_size = 0x4000000;
|
|
#else /* USER ONLY */
|
|
window_addr = 0x18000000;
|
|
window_size = 0x4000000;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int __init db1550_mtd_init(void)
|
|
{
|
|
struct mtd_partition *parts;
|
|
int nb_parts = 0;
|
|
|
|
/* Default flash bankwidth */
|
|
db1550_map.bankwidth = flash_bankwidth;
|
|
|
|
if (setup_flash_params())
|
|
return -ENXIO;
|
|
|
|
/*
|
|
* Static partition definition selection
|
|
*/
|
|
parts = db1550_partitions;
|
|
nb_parts = NB_OF(db1550_partitions);
|
|
db1550_map.size = window_size;
|
|
|
|
/*
|
|
* Now let's probe for the actual flash. Do it here since
|
|
* specific machine settings might have been set above.
|
|
*/
|
|
printk(KERN_NOTICE "Db1550 flash: probing %d-bit flash bus\n",
|
|
db1550_map.bankwidth*8);
|
|
db1550_map.virt = ioremap(window_addr, window_size);
|
|
mymtd = do_map_probe("cfi_probe", &db1550_map);
|
|
if (!mymtd) return -ENXIO;
|
|
mymtd->owner = THIS_MODULE;
|
|
|
|
add_mtd_partitions(mymtd, parts, nb_parts);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit db1550_mtd_cleanup(void)
|
|
{
|
|
if (mymtd) {
|
|
del_mtd_partitions(mymtd);
|
|
map_destroy(mymtd);
|
|
iounmap((void *) db1550_map.virt);
|
|
}
|
|
}
|
|
|
|
module_init(db1550_mtd_init);
|
|
module_exit(db1550_mtd_cleanup);
|
|
|
|
MODULE_AUTHOR("Embedded Edge, LLC");
|
|
MODULE_DESCRIPTION("Db1550 mtd map driver");
|
|
MODULE_LICENSE("GPL");
|