mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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c223e82fd4
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11673 3c298f89-4303-0410-b956-a3cf2f4a3e73
239 lines
6.0 KiB
C
239 lines
6.0 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
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* Copyright (C) 2008 John Crispin <blogic@openwrt.org>
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <asm/io.h>
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#include <linux/init.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/cfi.h>
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#include <asm/ifxmips/ifxmips.h>
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#include <asm/ifxmips/ifxmips_prom.h>
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#include <asm/ifxmips/ifxmips_ebu.h>
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#include <linux/magic.h>
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#include <linux/platform_device.h>
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static struct map_info
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ifxmips_map = {
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.name = "ifxmips_mtd",
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.bankwidth = 2,
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.size = 0x400000,
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};
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static map_word
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ifxmips_read16(struct map_info * map, unsigned long adr)
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{
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unsigned long flags;
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map_word temp;
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spin_lock_irqsave(&ebu_lock, flags);
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adr ^= 2;
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temp.x[0] = *((__u16*)(map->virt + adr));
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spin_unlock_irqrestore(&ebu_lock, flags);
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return temp;
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}
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static void
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ifxmips_write16(struct map_info *map, map_word d, unsigned long adr)
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{
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unsigned long flags;
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spin_lock_irqsave(&ebu_lock, flags);
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adr ^= 2;
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*((__u16*)(map->virt + adr)) = d.x[0];
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spin_unlock_irqrestore(&ebu_lock, flags);
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}
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void
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ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
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{
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unsigned char *p;
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unsigned char *to_8;
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unsigned long flags;
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spin_lock_irqsave(&ebu_lock, flags);
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from = (unsigned long)(from + map->virt);
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p = (unsigned char*) from;
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to_8 = (unsigned char*) to;
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while(len--)
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*to_8++ = *p++;
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spin_unlock_irqrestore(&ebu_lock, flags);
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}
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void
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ifxmips_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
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{
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unsigned char *p = (unsigned char*)from;
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unsigned char *to_8;
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unsigned long flags;
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spin_lock_irqsave(&ebu_lock, flags);
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to += (unsigned long) map->virt;
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to_8 = (unsigned char*)to;
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while(len--)
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*p++ = *to_8++;
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spin_unlock_irqrestore(&ebu_lock, flags);
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}
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static struct mtd_partition
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ifxmips_partitions[] = {
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{
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name:"uboot",
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offset:0x00000000,
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size:0x00020000,
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},
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{
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name:"uboot_env",
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offset:0x00020000,
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size:0x00010000,
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},
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{
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name:"kernel",
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offset:0x00030000,
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size:0x0,
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},
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{
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name:"rootfs",
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offset:0x0,
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size:0x0,
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},
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{
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name:"board_config",
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offset:0x0,
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size:0x0,
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},
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};
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int
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find_uImage_size(unsigned long start_offset){
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unsigned long temp;
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ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
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printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40);
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return temp + 0x40;
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}
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int
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find_brn_block(unsigned long start_offset){
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unsigned char temp[9];
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ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 8);
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temp[8] = '\0';
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printk(KERN_INFO "data in brn block %s\n", temp);
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if(memcmp(temp, "BRN-BOOT", 8) == 0)
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return 1;
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else
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return 0;
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}
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int
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detect_squashfs_partition(unsigned long start_offset){
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unsigned long temp;
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ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
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return (temp == SQUASHFS_MAGIC);
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}
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static int
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ifxmips_mtd_probe(struct platform_device *dev)
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{
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struct mtd_info *ifxmips_mtd = NULL;
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struct mtd_partition *parts = NULL;
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unsigned long uimage_size;
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ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);
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ifxmips_map.read = ifxmips_read16;
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ifxmips_map.write = ifxmips_write16;
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ifxmips_map.copy_from = ifxmips_copy_from;
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ifxmips_map.copy_to = ifxmips_copy_to;
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ifxmips_map.phys = dev->resource->start;
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ifxmips_map.size = dev->resource->end - ifxmips_map.phys + 1;
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ifxmips_map.virt = ioremap_nocache(ifxmips_map.phys, ifxmips_map.size);
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if(!ifxmips_map.virt)
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{
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printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n");
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return -EIO;
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}
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ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
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if(!ifxmips_mtd)
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{
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iounmap(ifxmips_map.virt);
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printk(KERN_WARNING "ifxmips_mtd: probing failed\n");
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return -ENXIO;
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}
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ifxmips_mtd->owner = THIS_MODULE;
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uimage_size = find_uImage_size(ifxmips_partitions[2].offset);
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if(detect_squashfs_partition(ifxmips_partitions[2].offset + uimage_size))
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{
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printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
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} else {
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uimage_size &= ~0xffff;
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uimage_size += 0x10000;
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}
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parts = &ifxmips_partitions[0];
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ifxmips_partitions[2].size = uimage_size;
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ifxmips_partitions[3].offset = ifxmips_partitions[2].offset + ifxmips_partitions[2].size;
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ifxmips_partitions[3].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - ifxmips_partitions[3].offset;
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if(ifxmips_has_brn_block())
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{
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ifxmips_partitions[3].size -= ifxmips_mtd->erasesize;
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ifxmips_partitions[4].offset = ifxmips_mtd->size - ifxmips_mtd->erasesize;
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ifxmips_partitions[4].size = ifxmips_mtd->erasesize;
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add_mtd_partitions(ifxmips_mtd, parts, 5);
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} else {
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add_mtd_partitions(ifxmips_mtd, parts, 4);
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}
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printk(KERN_INFO "ifxmips_mtd: added ifxmips flash with %dMB\n", ifxmips_mtd->size >> 20);
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return 0;
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}
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static struct
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platform_driver ifxmips_mtd_driver = {
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.probe = ifxmips_mtd_probe,
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.driver = {
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.name = "ifxmips_mtd",
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.owner = THIS_MODULE,
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},
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};
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int __init
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init_ifxmips_mtd(void)
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{
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int ret = platform_driver_register(&ifxmips_mtd_driver);
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if(ret)
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printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!");
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return ret;
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}
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static void __exit
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cleanup_ifxmips_mtd(void)
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{
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platform_driver_unregister(&ifxmips_mtd_driver);
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}
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module_init(init_ifxmips_mtd);
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module_exit(cleanup_ifxmips_mtd);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
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MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");
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