--- /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 / openwrt.git / blobdiff