treewide: fix replace nbd@openwrt.org with nbd@nbd.name
[openwrt.org/openwrt.git] / target / linux / adm8668 / files-3.18 / drivers / mtd / maps / adm8668.c
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/*
 *  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");
 
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