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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 <asm/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 <asm/ifxmips/ifxmips.h>
#include <asm/ifxmips/ifxmips_ebu.h>
#include <linux/magic.h>
#include <linux/platform_device.h>
static struct map_info
ifxmips_map = {
.name = "ifxmips_mtd",
.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[4] = {
{
name:"U-Boot",
offset:0x00000000,
size:0x00020000,
},
{
name:"U-Boot-Env",
offset:0x00020000,
size:0x00010000,
},
{
name:"kernel",
offset:0x00030000,
size:0x0,
},
{
name:"rootfs",
offset:0x0,
size:0x0,
},
};
int
find_uImage_size(unsigned long start_offset){
unsigned long temp;
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
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;
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;
uimage_size = find_uImage_size(ifxmips_partitions[2].offset);
if(detect_squashfs_partition(ifxmips_partitions[2].offset + uimage_size))
{
printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
} else {
uimage_size &= ~0xffff;
uimage_size += 0x10000;
}
ifxmips_partitions[2].size = uimage_size;
ifxmips_partitions[3].offset = ifxmips_partitions[2].offset + ifxmips_partitions[2].size;
ifxmips_partitions[3].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - ifxmips_partitions[3].offset;
parts = &ifxmips_partitions[0];
add_mtd_partitions(ifxmips_mtd, parts, 4);
printk(KERN_INFO "ifxmips_mtd: added ifxmips flash with %dMB\n", 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");
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