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/*
* drivers/mtd/maps/microdev-flash.c
*
* Flash Mapping for the SuperH SH4-202 MicroDev.
*
* Copyright (C) 2004 SuperH, Inc.
* Copyright (C) 2004 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
/*
* The SH4-202 MicroDev has 32M of Intel StrataFlash mapped into the
* beginning of the FEMI address space (mapped to P0). MicroDev flash
* consists of 2x16M chips, mapped contiguously, and accessed with a
* 32-bit buswidth.
*
* Additionally, the MicroDev also supports booting from an EEPROM.
* In the event that the EEPROM is configured, it is mapped in the
* same address space window as the StrataFlash. As such, we can only
* use one at a time.
*
* Since the EEPROM is only accessible with an 8-bit buswidth, flash
* is preferrable as far as performance is concerned.
*/
struct map_info microdev_flash_map = {
.name = "MicroDev Flash",
.size = 0x02000000,
.bankwidth = 4,
};
struct map_info microdev_eeprom_map = {
.name = "MicroDev EEPROM",
.size = 0x00100000,
.bankwidth = 1,
};
static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
static struct mtd_partition *parsed_parts;
/*
* Default partition map.
*/
static struct mtd_partition microdev_partitions[] = {
#ifdef CONFIG_MTD_PARTITIONS
{
.name = "bootloader",
.size = 0x00080000,
.mask_flags = MTD_WRITEABLE, /* force read-only */
}, {
.name = "User FS",
.offset = MTDPART_OFS_APPEND,
.size = MTDPART_SIZ_FULL,
},
#endif
};
static struct mtd_info *microdev_flash;
static struct mtd_info *microdev_eeprom;
static struct mtd_info *microdev_mtd;
static void show_map_info(struct map_info *info)
{
unsigned long addr;
if (!info)
return;
addr = info->phys & 0x1fffffff;
printk(KERN_NOTICE "%s at 0x%08lx:0x%08lx, using a %d-bit bankwidth.\n",
info->name, addr, addr + info->size, info->bankwidth << 3);
}
static int __init microdev_map_init(void)
{
struct mtd_partition *parts;
int nr_parts, parsed_nr_parts;
/* Flash mapped at FEMI area 0 */
microdev_flash_map.phys = 0;
microdev_flash_map.virt = (void __iomem *)P2SEGADDR(0);
/* EEPROM mapped in the same place */
microdev_eeprom_map.phys = 0;
microdev_eeprom_map.virt = (void __iomem *)P2SEGADDR(0);
simple_map_init(µdev_flash_map);
simple_map_init(µdev_eeprom_map);
/* Try the flash first */
printk(KERN_NOTICE "MicroDev flash: probing for flash chips at 0x00000000:\n");
microdev_flash = do_map_probe("cfi_probe", µdev_flash_map);
if (!microdev_flash) {
printk(KERN_NOTICE "Flash chips not detected, probing for EEPROM\n");
/* No luck, try EEPROM */
microdev_eeprom = do_map_probe("map_rom", µdev_eeprom_map);
if (!microdev_eeprom) {
/* Nope.. */
printk(KERN_ERR "nothing found\n");
return -ENXIO;
}
}
if (microdev_flash) {
microdev_mtd = microdev_flash;
show_map_info(µdev_flash_map);
} else {
microdev_mtd = microdev_eeprom;
show_map_info(µdev_eeprom_map);
}
microdev_mtd->owner = THIS_MODULE;
/* Start out with a static map.. */
parts = microdev_partitions;
nr_parts = ARRAY_SIZE(microdev_partitions);
#ifdef CONFIG_MTD_PARTITIONS
/* Try to parse the partitions */
parsed_nr_parts = parse_mtd_partitions(microdev_mtd, probes, &parsed_parts, 0);
if (parsed_nr_parts > 0) {
parts = parsed_parts;
nr_parts = parsed_nr_parts;
}
#endif
if (nr_parts > 0) {
add_mtd_partitions(microdev_mtd, parts, nr_parts);
} else {
add_mtd_device(microdev_mtd);
}
return 0;
}
static void __exit microdev_map_exit(void)
{
if (parsed_parts) {
del_mtd_partitions(microdev_mtd);
} else {
del_mtd_device(microdev_mtd);
}
map_destroy(microdev_mtd);
}
module_init(microdev_map_init);
module_exit(microdev_map_exit);
MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
MODULE_DESCRIPTION("MTD map driver for SuperH SH4-202 MicroDev");
MODULE_LICENSE("GPL");
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