/*
* 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");
