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/*
* Flash memory access on AMD Alchemy evaluation boards
*
* $Id: alchemy-flash.c,v 1.1 2005/02/27 21:50:21 ppopov Exp $
*
* (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
#ifdef CONFIG_MIPS_PB1000
#define BOARD_MAP_NAME "Pb1000 Flash"
#define BOARD_FLASH_SIZE 0x00800000 /* 8MB */
#define BOARD_FLASH_WIDTH 4 /* 32-bits */
#endif
#ifdef CONFIG_MIPS_PB1500
#define BOARD_MAP_NAME "Pb1500 Flash"
#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
#define BOARD_FLASH_WIDTH 4 /* 32-bits */
#endif
#ifdef CONFIG_MIPS_PB1100
#define BOARD_MAP_NAME "Pb1100 Flash"
#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
#define BOARD_FLASH_WIDTH 4 /* 32-bits */
#endif
#ifdef CONFIG_MIPS_PB1550
#define BOARD_MAP_NAME "Pb1550 Flash"
#define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
#define BOARD_FLASH_WIDTH 4 /* 32-bits */
#endif
#ifdef CONFIG_MIPS_PB1200
#define BOARD_MAP_NAME "Pb1200 Flash"
#define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
#define BOARD_FLASH_WIDTH 2 /* 16-bits */
#endif
#ifdef CONFIG_MIPS_DB1000
#define BOARD_MAP_NAME "Db1000 Flash"
#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
#define BOARD_FLASH_WIDTH 4 /* 32-bits */
#endif
#ifdef CONFIG_MIPS_DB1500
#define BOARD_MAP_NAME "Db1500 Flash"
#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
#define BOARD_FLASH_WIDTH 4 /* 32-bits */
#endif
#ifdef CONFIG_MIPS_DB1100
#define BOARD_MAP_NAME "Db1100 Flash"
#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
#define BOARD_FLASH_WIDTH 4 /* 32-bits */
#endif
#ifdef CONFIG_MIPS_DB1550
#define BOARD_MAP_NAME "Db1550 Flash"
#define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
#define BOARD_FLASH_WIDTH 4 /* 32-bits */
#endif
#ifdef CONFIG_MIPS_DB1200
#define BOARD_MAP_NAME "Db1200 Flash"
#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
#define BOARD_FLASH_WIDTH 2 /* 16-bits */
#endif
#ifdef CONFIG_MIPS_HYDROGEN3
#define BOARD_MAP_NAME "Hydrogen3 Flash"
#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
#define BOARD_FLASH_WIDTH 4 /* 32-bits */
#define USE_LOCAL_ACCESSORS /* why? */
#endif
#ifdef CONFIG_MIPS_BOSPORUS
#define BOARD_MAP_NAME "Bosporus Flash"
#define BOARD_FLASH_SIZE 0x01000000 /* 16MB */
#define BOARD_FLASH_WIDTH 2 /* 16-bits */
#endif
#ifdef CONFIG_MIPS_MIRAGE
#define BOARD_MAP_NAME "Mirage Flash"
#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
#define BOARD_FLASH_WIDTH 4 /* 32-bits */
#define USE_LOCAL_ACCESSORS /* why? */
#endif
static struct map_info alchemy_map = {
.name = BOARD_MAP_NAME,
};
static struct mtd_partition alchemy_partitions[] = {
{
.name = "User FS",
.size = BOARD_FLASH_SIZE - 0x00400000,
.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,
}
};
#define NB_OF(x) (sizeof(x)/sizeof(x[0]))
static struct mtd_info *mymtd;
int __init alchemy_mtd_init(void)
{
struct mtd_partition *parts;
int nb_parts = 0;
unsigned long window_addr;
unsigned long window_size;
/* Default flash buswidth */
alchemy_map.bankwidth = BOARD_FLASH_WIDTH;
window_addr = 0x20000000 - BOARD_FLASH_SIZE;
window_size = BOARD_FLASH_SIZE;
#ifdef CONFIG_MIPS_MIRAGE_WHY
/* Boot ROM flash bank only; no user bank */
window_addr = 0x1C000000;
window_size = 0x04000000;
/* USERFS from 0x1C00 0000 to 0x1FC00000 */
alchemy_partitions[0].size = 0x03C00000;
#endif
/*
* Static partition definition selection
*/
parts = alchemy_partitions;
nb_parts = NB_OF(alchemy_partitions);
alchemy_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 BOARD_MAP_NAME ": probing %d-bit flash bus\n",
alchemy_map.bankwidth*8);
alchemy_map.virt = ioremap(window_addr, window_size);
mymtd = do_map_probe("cfi_probe", &alchemy_map);
if (!mymtd) {
iounmap(alchemy_map.virt);
return -ENXIO;
}
mymtd->owner = THIS_MODULE;
add_mtd_partitions(mymtd, parts, nb_parts);
return 0;
}
static void __exit alchemy_mtd_cleanup(void)
{
if (mymtd) {
del_mtd_partitions(mymtd);
map_destroy(mymtd);
iounmap(alchemy_map.virt);
}
}
module_init(alchemy_mtd_init);
module_exit(alchemy_mtd_cleanup);
MODULE_AUTHOR("Embedded Alley Solutions, Inc");
MODULE_DESCRIPTION(BOARD_MAP_NAME " MTD driver");
MODULE_LICENSE("GPL");
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