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openwrt-xburst/target/linux/ifxmips/files/drivers/mtd/maps/ifxmips.c

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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
* Copyright (C) 2008 John Crispin <blogic@openwrt.org>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/cfi.h>
#include <linux/magic.h>
#include <linux/platform_device.h>
#include <asm/ifxmips/ifxmips.h>
#include <asm/ifxmips/ifxmips_prom.h>
#include <asm/ifxmips/ifxmips_ebu.h>
#ifndef CONFIG_MTD_PARTITIONS
#error Please enable CONFIG_MTD_PARTITIONS
#endif
static struct map_info ifxmips_map = {
.name = "ifx-nor",
.bankwidth = 2,
.size = 0x400000,
};
static map_word ifxmips_read16(struct map_info *map, unsigned long adr)
{
unsigned long flags;
map_word temp;
spin_lock_irqsave(&ebu_lock, flags);
adr ^= 2;
temp.x[0] = *((__u16 *)(map->virt + adr));
spin_unlock_irqrestore(&ebu_lock, flags);
return temp;
}
static void ifxmips_write16(struct map_info *map, map_word d, unsigned long adr)
{
unsigned long flags;
spin_lock_irqsave(&ebu_lock, flags);
adr ^= 2;
*((__u16 *)(map->virt + adr)) = d.x[0];
spin_unlock_irqrestore(&ebu_lock, flags);
}
void ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
unsigned char *p;
unsigned char *to_8;
unsigned long flags;
spin_lock_irqsave(&ebu_lock, flags);
from = (unsigned long)(from + map->virt);
p = (unsigned char *) from;
to_8 = (unsigned char *) to;
while (len--)
*to_8++ = *p++;
spin_unlock_irqrestore(&ebu_lock, flags);
}
void ifxmips_copy_to(struct map_info *map,
unsigned long to,
const void *from,
ssize_t len)
{
unsigned char *p = (unsigned char *)from;
unsigned char *to_8;
unsigned long flags;
spin_lock_irqsave(&ebu_lock, flags);
to += (unsigned long) map->virt;
to_8 = (unsigned char *)to;
while (len--)
*p++ = *to_8++;
spin_unlock_irqrestore(&ebu_lock, flags);
}
static struct mtd_partition ifxmips_partitions[] = {
{
.name = "uboot",
.offset = 0x00000000,
.size = 0x00020000,
},
{
.name = "uboot_env",
.offset = 0x00020000,
.size = 0x00010000,
},
{
.name = "kernel",
.offset = 0x00030000,
.size = 0x0,
},
{
.name = "rootfs",
.offset = 0x0,
.size = 0x0,
},
{
.name = "board_config",
.offset = 0x0,
.size = 0x0,
},
};
static struct mtd_partition ifxmips_meta_partition = {
.name = "linux",
.offset = 0x00030000,
.size = 0x0,
};
static const char *part_probe_types[] = { "cmdlinepart", NULL };
int find_uImage_size(unsigned long start_offset)
{
unsigned long magic;
unsigned long temp;
ifxmips_copy_from(&ifxmips_map, &magic, start_offset, 4);
if (!(ntohl(magic) == 0x27051956)) {
printk(KERN_INFO "ifxmips_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", ntohl(magic), start_offset);
return 0;
}
ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40);
return temp + 0x40;
}
int find_brn_block(unsigned long start_offset)
{
unsigned char temp[9];
ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 8);
temp[8] = '\0';
printk(KERN_INFO "data in brn block %s\n", temp);
if (memcmp(temp, "BRN-BOOT", 8) == 0)
return 1;
else
return 0;
}
int detect_squashfs_partition(unsigned long start_offset)
{
unsigned long temp;
ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
return temp == SQUASHFS_MAGIC;
}
static int ifxmips_mtd_probe(struct platform_device *dev)
{
struct mtd_info *ifxmips_mtd = NULL;
struct mtd_partition *parts = NULL;
unsigned long uimage_size;
int err, i;
int kernel_part = 2, rootfs_part = 3;
int num_parts = ARRAY_SIZE(ifxmips_partitions);
ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);
ifxmips_map.read = ifxmips_read16;
ifxmips_map.write = ifxmips_write16;
ifxmips_map.copy_from = ifxmips_copy_from;
ifxmips_map.copy_to = ifxmips_copy_to;
ifxmips_map.phys = dev->resource->start;
ifxmips_map.size = dev->resource->end - ifxmips_map.phys + 1;
ifxmips_map.virt = ioremap_nocache(ifxmips_map.phys, ifxmips_map.size);
if (!ifxmips_map.virt) {
printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n");
return -EIO;
}
ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
if (!ifxmips_mtd) {
iounmap(ifxmips_map.virt);
printk(KERN_WARNING "ifxmips_mtd: probing failed\n");
return -ENXIO;
}
ifxmips_mtd->owner = THIS_MODULE;
err = parse_mtd_partitions(ifxmips_mtd, part_probe_types, &parts, 0);
if (err > 0) {
printk(KERN_INFO "ifxmips_mtd: found %d partitions from cmdline\n", err);
num_parts = err;
kernel_part = 0;
rootfs_part = 0;
for (i = 0; i < num_parts; i++) {
if (strcmp(parts[i].name, "kernel") == 0)
kernel_part = i;
if (strcmp(parts[i].name, "rootfs") == 0)
rootfs_part = i;
}
} else {
parts = &ifxmips_partitions[0];
}
/* dynamic size detection only if rootfs-part follows kernel-part */
if (kernel_part+1 == rootfs_part) {
uimage_size = find_uImage_size(parts[kernel_part].offset);
if (detect_squashfs_partition(parts[kernel_part].offset + uimage_size)) {
printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
} else {
uimage_size &= ~0xffff;
uimage_size += 0x10000;
}
parts[kernel_part].size = uimage_size;
parts[rootfs_part].offset = parts[kernel_part].offset + parts[kernel_part].size;
parts[rootfs_part].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - parts[rootfs_part].offset;
ifxmips_meta_partition.offset = parts[kernel_part].offset;
ifxmips_meta_partition.size = parts[kernel_part].size + parts[rootfs_part].size;
}
if (err <= 0) {
if (ifxmips_has_brn_block()) {
parts[4].size -= ifxmips_mtd->erasesize;
parts[5].offset = ifxmips_mtd->size - ifxmips_mtd->erasesize;
parts[5].size = ifxmips_mtd->erasesize;
} else {
num_parts--;
}
}
add_mtd_partitions(ifxmips_mtd, parts, num_parts);
add_mtd_partitions(ifxmips_mtd, &ifxmips_meta_partition, 1);
printk(KERN_INFO "ifxmips_mtd: added %s flash with %dMB\n",
ifxmips_map.name, ifxmips_mtd->size >> 20);
return 0;
}
static struct platform_driver ifxmips_mtd_driver = {
.probe = ifxmips_mtd_probe,
.driver = {
.name = "ifxmips_mtd",
.owner = THIS_MODULE,
},
};
int __init init_ifxmips_mtd(void)
{
int ret = platform_driver_register(&ifxmips_mtd_driver);
if (ret)
printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!");
return ret;
}
static void __exit cleanup_ifxmips_mtd(void)
{
platform_driver_unregister(&ifxmips_mtd_driver);
}
module_init(init_ifxmips_mtd);
module_exit(cleanup_ifxmips_mtd);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");