/*
* Flash memory access on Alchemy Db1xxx boards
*
* $Id: db1x00-flash.c,v 1.6 2004/11/04 13:24:14 gleixner Exp $
*
* (C) 2003 Pete Popov <ppopov@embeddedalley.com>
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.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
/* MTD CONFIG OPTIONS */
#if defined(CONFIG_MTD_DB1X00_BOOT) && defined(CONFIG_MTD_DB1X00_USER)
#define DB1X00_BOTH_BANKS
#elif defined(CONFIG_MTD_DB1X00_BOOT) && !defined(CONFIG_MTD_DB1X00_USER)
#define DB1X00_BOOT_ONLY
#elif !defined(CONFIG_MTD_DB1X00_BOOT) && defined(CONFIG_MTD_DB1X00_USER)
#define DB1X00_USER_ONLY
#endif
static unsigned long window_addr;
static unsigned long window_size;
static unsigned long flash_size;
static unsigned short *bcsr = (unsigned short *)0xAE000000;
static unsigned char flash_bankwidth = 4;
/*
* The Db1x boards support different flash densities. We setup
* the mtd_partition structures below for default of 64Mbit
* flash densities, and override the partitions sizes, if
* necessary, after we check the board status register.
*/
#ifdef DB1X00_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 db1x00_partitions[] = {
{
.name = "User FS",
.size = 0x1c00000,
.offset = 0x0000000
},{
.name = "yamon",
.size = 0x0100000,
.offset = MTDPART_OFS_APPEND,
.mask_flags = MTD_WRITEABLE
},{
.name = "raw kernel",
.size = (0x300000-0x40000), /* last 256KB is env */
.offset = MTDPART_OFS_APPEND,
}
};
#elif defined(DB1X00_BOOT_ONLY)
static struct mtd_partition db1x00_partitions[] = {
{
.name = "User FS",
.size = 0x00c00000,
.offset = 0x0000000
},{
.name = "yamon",
.size = 0x0100000,
.offset = MTDPART_OFS_APPEND,
.mask_flags = MTD_WRITEABLE
},{
.name = "raw kernel",
.size = (0x300000-0x40000), /* last 256KB is env */
.offset = MTDPART_OFS_APPEND,
}
};
#elif defined(DB1X00_USER_ONLY)
static struct mtd_partition db1x00_partitions[] = {
{
.name = "User FS",
.size = 0x0e00000,
.offset = 0x0000000
},{
.name = "raw kernel",
.size = MTDPART_SIZ_FULL,
.offset = MTDPART_OFS_APPEND,
}
};
#else
#error MTD_DB1X00 define combo error /* should never happen */
#endif
#define NB_OF(x) (sizeof(x)/sizeof(x[0]))
#define NAME "Db1x00 Linux Flash"
static struct map_info db1xxx_mtd_map = {
.name = NAME,
};
static struct mtd_partition *parsed_parts;
static struct mtd_info *db1xxx_mtd;
/*
* 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)
{
switch ((bcsr[2] >> 14) & 0x3) {
case 0: /* 64Mbit devices */
flash_size = 0x800000; /* 8MB per part */
#if defined(DB1X00_BOTH_BANKS)
window_addr = 0x1E000000;
window_size = 0x2000000;
#elif defined(DB1X00_BOOT_ONLY)
window_addr = 0x1F000000;
window_size = 0x1000000;
#else /* USER ONLY */
window_addr = 0x1E000000;
window_size = 0x1000000;
#endif
break;
case 1:
/* 128 Mbit devices */
flash_size = 0x1000000; /* 16MB per part */
#if defined(DB1X00_BOTH_BANKS)
window_addr = 0x1C000000;
window_size = 0x4000000;
/* USERFS from 0x1C00 0000 to 0x1FC0 0000 */
db1x00_partitions[0].size = 0x3C00000;
#elif defined(DB1X00_BOOT_ONLY)
window_addr = 0x1E000000;
window_size = 0x2000000;
/* USERFS from 0x1E00 0000 to 0x1FC0 0000 */
db1x00_partitions[0].size = 0x1C00000;
#else /* USER ONLY */
window_addr = 0x1C000000;
window_size = 0x2000000;
/* USERFS from 0x1C00 0000 to 0x1DE00000 */
db1x00_partitions[0].size = 0x1DE0000;
#endif
break;
case 2:
/* 256 Mbit devices */
flash_size = 0x4000000; /* 64MB per part */
#if defined(DB1X00_BOTH_BANKS)
return 1;
#elif defined(DB1X00_BOOT_ONLY)
/* Boot ROM flash bank only; no user bank */
window_addr = 0x1C000000;
window_size = 0x4000000;
/* USERFS from 0x1C00 0000 to 0x1FC00000 */
db1x00_partitions[0].size = 0x3C00000;
#else /* USER ONLY */
return 1;
#endif
break;
default:
return 1;
}
db1xxx_mtd_map.size = window_size;
db1xxx_mtd_map.bankwidth = flash_bankwidth;
db1xxx_mtd_map.phys = window_addr;
db1xxx_mtd_map.bankwidth = flash_bankwidth;
return 0;
}
int __init db1x00_mtd_init(void)
{
struct mtd_partition *parts;
int nb_parts = 0;
if (setup_flash_params())
return -ENXIO;
/*
* Static partition definition selection
*/
parts = db1x00_partitions;
nb_parts = NB_OF(db1x00_partitions);
/*
* Now let's probe for the actual flash. Do it here since
* specific machine settings might have been set above.
*/
printk(KERN_NOTICE "Db1xxx flash: probing %d-bit flash bus\n",
db1xxx_mtd_map.bankwidth*8);
db1xxx_mtd_map.virt = ioremap(window_addr, window_size);
db1xxx_mtd = do_map_probe("cfi_probe", &db1xxx_mtd_map);
if (!db1xxx_mtd) return -ENXIO;
db1xxx_mtd->owner = THIS_MODULE;
add_mtd_partitions(db1xxx_mtd, parts, nb_parts);
return 0;
}
static void __exit db1x00_mtd_cleanup(void)
{
if (db1xxx_mtd) {
del_mtd_partitions(db1xxx_mtd);
map_destroy(db1xxx_mtd);
if (parsed_parts)
kfree(parsed_parts);
}
}
module_init(db1x00_mtd_init);
module_exit(db1x00_mtd_cleanup);
MODULE_AUTHOR("Pete Popov");
MODULE_DESCRIPTION("Db1x00 mtd map driver");
MODULE_LICENSE("GPL");
