+++ /dev/null
-/*
- * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
- * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
- * Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
- *
- * original functions for finding root filesystem from Mike Baker
- *
- * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * 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.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- *
- * Copyright 2004, Broadcom Corporation
- * All Rights Reserved.
- *
- * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
- * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
- * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
- *
- * Flash mapping for adm8668 boards
- *
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/map.h>
-#include <linux/slab.h>
-#include <linux/mtd/partitions.h>
-#include <linux/crc32.h>
-#include <linux/magic.h>
-#include <asm/io.h>
-
-#define WINDOW_ADDR 0x10000000
-#define WINDOW_SIZE 0x800000
-#define BANKWIDTH 2
-
-/* first a little bit about the headers i need.. */
-
-/* just interested in part of the full struct */
-struct squashfs_super_block {
- __le32 s_magic;
- __le32 pad0[9]; /* it's not really padding */
- __le64 bytes_used;
-};
-
-#define IH_MAGIC 0x56190527 /* Image Magic Number */
-struct uboot_header {
- uint32_t ih_magic; /* Image Header Magic Number */
- uint32_t ih_hcrc; /* Image Header CRC Checksum */
- uint32_t ih_time; /* Image Creation Timestamp */
- uint32_t ih_size; /* Image Data Size */
- uint32_t ih_load; /* Data Load Address */
- uint32_t ih_ep; /* Entry Point Address */
- uint32_t ih_dcrc; /* Image Data CRC Checksum */
- uint8_t ih_os; /* Operating System */
- uint8_t ih_arch; /* CPU architecture */
- uint8_t ih_type; /* Image Type */
- uint8_t ih_comp; /* Compression Type */
- char ih_name[32]; /* image name */
-};
-
-/************************************************/
-
-static struct mtd_info *adm8668_mtd;
-
-struct map_info adm8668_map = {
- name: "adm8668-nor",
- size: WINDOW_SIZE,
- phys: WINDOW_ADDR,
- bankwidth: BANKWIDTH,
-};
-
-/*
- * Copied from mtdblock.c
- *
- * Cache stuff...
- *
- * Since typical flash erasable sectors are much larger than what Linux's
- * buffer cache can handle, we must implement read-modify-write on flash
- * sectors for each block write requests. To avoid over-erasing flash sectors
- * and to speed things up, we locally cache a whole flash sector while it is
- * being written to until a different sector is required.
- */
-
-static void erase_callback(struct erase_info *done)
-{
- wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
- wake_up(wait_q);
-}
-
-static int erase_write (struct mtd_info *mtd, unsigned long pos,
- int len, const char *buf)
-{
- struct erase_info erase;
- DECLARE_WAITQUEUE(wait, current);
- wait_queue_head_t wait_q;
- size_t retlen;
- int ret;
-
- /*
- * First, let's erase the flash block.
- */
-
- init_waitqueue_head(&wait_q);
- erase.mtd = mtd;
- erase.callback = erase_callback;
- erase.addr = pos;
- erase.len = len;
- erase.priv = (u_long)&wait_q;
-
- set_current_state(TASK_INTERRUPTIBLE);
- add_wait_queue(&wait_q, &wait);
-
- ret = mtd->erase(mtd, &erase);
- if (ret) {
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&wait_q, &wait);
- printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
- "on \"%s\" failed\n",
- pos, len, mtd->name);
- return ret;
- }
-
- schedule(); /* Wait for erase to finish. */
- remove_wait_queue(&wait_q, &wait);
-
- /*
- * Next, write data to flash.
- */
-
- ret = mtd->write (mtd, pos, len, &retlen, buf);
- if (ret)
- return ret;
- if (retlen != len)
- return -EIO;
- return 0;
-}
-
-/* decent defaults in case... shrug */
-static struct mtd_partition adm8668_parts[] = {
- { name: "linux", offset: 0x40000, size: WINDOW_SIZE-0x40000, },
- { name: "rootfs", offset: 0xe0000, size: 0x140000, },
- { name: "uboot_env", offset: 0x20000, size: 0x20000, },
- { name: NULL, },
-};
-
-/* in case i wanna change stuff later, and to clarify the math section... */
-#define PART_LINUX 0
-#define PART_ROOTFS 1
-#define NR_PARTS 3
-
-static int __init
-init_mtd_partitions(struct mtd_info *mtd, size_t size)
-{
- struct uboot_header uhdr;
- int off, blocksize;
- size_t len, linux_len;
- struct squashfs_super_block shdr;
-
- blocksize = mtd->erasesize;
- if (blocksize < 0x10000)
- blocksize = 0x10000;
-
- /* now find squashfs */
- memset(&shdr, 0xe5, sizeof(shdr));
- for (off = adm8668_parts[PART_LINUX].offset; off < size; off += blocksize) {
- /*
- * Read into buffer
- */
- if (mtd->read(mtd, off, sizeof(shdr), &len, (char *)&shdr) ||
- len != sizeof(shdr))
- continue;
-
- if (shdr.s_magic == SQUASHFS_MAGIC) {
- uint32_t fs_size = (uint32_t)shdr.bytes_used;
-
- printk(KERN_INFO "%s: Filesystem type: squashfs, size=%dkB\n",
- mtd->name, fs_size>>10);
-
- /* Update rootfs based on the superblock info, and
- * stretch to end of MTD. rootfs_split will split it */
- adm8668_parts[PART_ROOTFS].offset = off;
- adm8668_parts[PART_ROOTFS].size = mtd->size -
- adm8668_parts[PART_ROOTFS].offset;
-
- /* kernel ends where rootfs starts
- * but we'll keep it full-length for upgrades */
- linux_len = adm8668_parts[PART_LINUX+1].offset -
- adm8668_parts[PART_LINUX].offset;
-#if 1
- adm8668_parts[PART_LINUX].size = mtd->size -
- adm8668_parts[PART_LINUX].offset;
-#else
- adm8668_parts[PART_LINUX].size = linux_len;
-#endif
- goto found;
- }
- }
-
- printk(KERN_NOTICE
- "%s: Couldn't find root filesystem\n",
- mtd->name);
- return NR_PARTS;
-
- found:
- if (mtd->read(mtd, adm8668_parts[PART_LINUX].offset, sizeof(uhdr), &len, (char *)&uhdr) ||
- len != sizeof(uhdr))
- return NR_PARTS;
-
- /* that's odd. how'd ya boot it then */
- if (uhdr.ih_magic != IH_MAGIC)
- return NR_PARTS;
-
- if (be32_to_cpu(uhdr.ih_size) != (linux_len - sizeof(uhdr))) {
- unsigned char *block, *data;
- unsigned int offset;
-
- offset = adm8668_parts[PART_LINUX].offset +
- sizeof(struct uboot_header);
- data = (unsigned char *)(WINDOW_ADDR | 0xA0000000 | offset);
-
- printk(KERN_NOTICE "Updating U-boot image:\n");
- printk(KERN_NOTICE " old: [size: %8d crc32: 0x%08x]\n",
- be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
-
- /* Update the data length & crc32 */
- uhdr.ih_size = cpu_to_be32(linux_len - sizeof(uhdr));
- uhdr.ih_dcrc = crc32_le(~0, data, linux_len - sizeof(uhdr)) ^ (~0);
- uhdr.ih_dcrc = cpu_to_be32(uhdr.ih_dcrc);
-
- printk(KERN_NOTICE " new: [size: %8d crc32: 0x%08x]\n",
- be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
-
- /* update header's crc... */
- uhdr.ih_hcrc = 0;
- uhdr.ih_hcrc = crc32_le(~0, (unsigned char *)&uhdr,
- sizeof(uhdr)) ^ (~0);
- uhdr.ih_hcrc = cpu_to_be32(uhdr.ih_hcrc);
-
- /* read first eraseblock from the image */
- block = kmalloc(mtd->erasesize, GFP_KERNEL);
- if (mtd->read(mtd, adm8668_parts[PART_LINUX].offset, mtd->erasesize, &len, block) || len != mtd->erasesize) {
- printk("Error copying first eraseblock\n");
- return 0;
- }
-
- /* Write updated header to the flash */
- memcpy(block, &uhdr, sizeof(uhdr));
- if (mtd->unlock)
- mtd->unlock(mtd, off, mtd->erasesize);
- erase_write(mtd, adm8668_parts[PART_LINUX].offset, mtd->erasesize, block);
- if (mtd->sync)
- mtd->sync(mtd);
- kfree(block);
- printk(KERN_NOTICE "Done\n");
- }
-
- return NR_PARTS;
-}
-
-int __init init_adm8668_map(void)
-{
- int nr_parts, ret;
-
- adm8668_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
-
- if (!adm8668_map.virt) {
- printk(KERN_ERR "Failed to ioremap\n");
- return -EIO;
- }
-
- simple_map_init(&adm8668_map);
- if (!(adm8668_mtd = do_map_probe("cfi_probe", &adm8668_map))) {
- printk(KERN_ERR "cfi_probe failed\n");
- iounmap((void *)adm8668_map.virt);
- return -ENXIO;
- }
-
- adm8668_mtd->owner = THIS_MODULE;
-
- nr_parts = init_mtd_partitions(adm8668_mtd, adm8668_mtd->size);
- ret = mtd_device_register(adm8668_mtd, adm8668_parts, nr_parts);
- if (ret) {
- printk(KERN_ERR "Flash: mtd_device_register failed\n");
- goto fail;
- }
-
- return 0;
-
- fail:
- if (adm8668_mtd)
- map_destroy(adm8668_mtd);
- if (adm8668_map.virt)
- iounmap((void *) adm8668_map.virt);
- adm8668_map.virt = 0;
- return ret;
-}
-
-void __exit cleanup_adm8668_map(void)
-{
- mtd_device_unregister(adm8668_mtd);
- map_destroy(adm8668_mtd);
- iounmap((void *) adm8668_map.virt);
- adm8668_map.virt = 0;
-}
-
-module_init(init_adm8668_map);
-module_exit(cleanup_adm8668_map);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
-MODULE_DESCRIPTION("MTD map driver for ADM8668 NOR Flash");
projects / openwrt / svn-archive / archive.git / blobdiff