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283 lines
7.7 KiB
C
283 lines
7.7 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 <linux/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 <linux/magic.h>
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#include <linux/platform_device.h>
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#include <ifxmips.h>
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#include <ifxmips_prom.h>
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#include <ifxmips_ebu.h>
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#ifndef CONFIG_MTD_PARTITIONS
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#error Please enable CONFIG_MTD_PARTITIONS
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#endif
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static struct map_info ifxmips_map = {
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.name = "ifx-nor",
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.bankwidth = 2,
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.size = 0x400000,
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};
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static map_word 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 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 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 ifxmips_copy_to(struct map_info *map,
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unsigned long to,
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const void *from,
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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 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 = 0x0,
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},
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{
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.name = "kernel",
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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 = "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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static struct mtd_partition ifxmips_meta_partition = {
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.name = "linux",
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.offset = 0x00030000,
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.size = 0x0,
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};
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static const char *part_probe_types[] = { "cmdlinepart", NULL };
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int find_uImage_size(unsigned long start_offset)
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{
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unsigned long magic;
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unsigned long temp;
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ifxmips_copy_from(&ifxmips_map, &magic, start_offset, 4);
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if (le32_to_cpu(magic) != 0x56190527) {
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printk(KERN_INFO "ifxmips_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", le32_to_cpu(magic), start_offset);
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return 0;
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}
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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 find_brn_block(unsigned long start_offset)
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{
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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 detect_squashfs_partition(unsigned long start_offset)
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{
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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 le32_to_cpu(temp) == SQUASHFS_MAGIC;
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}
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static int 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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int err, i;
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int kernel_part = 2, rootfs_part = 3;
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int num_parts = ARRAY_SIZE(ifxmips_partitions);
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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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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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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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err = parse_mtd_partitions(ifxmips_mtd, part_probe_types, &parts, 0);
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if (err > 0) {
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printk(KERN_INFO "ifxmips_mtd: found %d partitions from cmdline\n", err);
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num_parts = err;
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kernel_part = 0;
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rootfs_part = 0;
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for (i = 0; i < num_parts; i++) {
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if (strcmp(parts[i].name, "kernel") == 0)
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kernel_part = i;
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if (strcmp(parts[i].name, "rootfs") == 0)
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rootfs_part = i;
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}
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} else {
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/* if the flash is 64k sectors, the kernel will reside at 0xb0030000
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if the flash is 128k sectors, the kernel will reside at 0xb0040000 */
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ifxmips_partitions[1].size = ifxmips_mtd->erasesize;
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ifxmips_partitions[2].offset = ifxmips_partitions[1].offset + ifxmips_mtd->erasesize;
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parts = &ifxmips_partitions[0];
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}
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/* dynamic size detection only if rootfs-part follows kernel-part */
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if (kernel_part+1 == rootfs_part) {
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uimage_size = find_uImage_size(parts[kernel_part].offset);
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if (detect_squashfs_partition(parts[kernel_part].offset + uimage_size)) {
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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 &= ~(ifxmips_mtd->erasesize -1);
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uimage_size += ifxmips_mtd->erasesize;
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}
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parts[kernel_part].size = uimage_size;
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parts[rootfs_part].offset = parts[kernel_part].offset + parts[kernel_part].size;
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parts[rootfs_part].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - parts[rootfs_part].offset;
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ifxmips_meta_partition.offset = parts[kernel_part].offset;
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ifxmips_meta_partition.size = parts[kernel_part].size + parts[rootfs_part].size;
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}
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if (err <= 0) {
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if (ifxmips_has_brn_block()) {
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parts[3].size -= ifxmips_mtd->erasesize;
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parts[4].offset = ifxmips_mtd->size - ifxmips_mtd->erasesize;
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parts[4].size = ifxmips_mtd->erasesize;
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ifxmips_meta_partition.size -= ifxmips_mtd->erasesize;
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} else {
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num_parts--;
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}
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}
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add_mtd_partitions(ifxmips_mtd, parts, num_parts);
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add_mtd_partitions(ifxmips_mtd, &ifxmips_meta_partition, 1);
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printk(KERN_INFO "ifxmips_mtd: added %s flash with %dMB\n",
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ifxmips_map.name, ((int)ifxmips_mtd->size) >> 20);
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return 0;
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}
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static struct 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 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 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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