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openwrt/target/linux/brcm47xx/files/drivers/mtd/maps/bcm47xx-flash.c

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/*
* 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 2001-2003, 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 BCM947XX boards
*/
#include <linux/init.h>
#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>
#ifdef CONFIG_MTD_PARTITIONS
#include <linux/mtd/partitions.h>
#endif
#include <linux/crc32.h>
#ifdef CONFIG_SSB
#include <linux/ssb/ssb.h>
#endif
#include <asm/io.h>
#define TRX_MAGIC 0x30524448 /* "HDR0" */
#define TRX_VERSION 1
#define TRX_MAX_LEN 0x3A0000
#define TRX_NO_HEADER 1 /* Do not write TRX header */
#define TRX_GZ_FILES 0x2 /* Contains up to TRX_MAX_OFFSET individual gzip files */
#define TRX_MAX_OFFSET 3
struct trx_header {
u32 magic; /* "HDR0" */
u32 len; /* Length of file including header */
u32 crc32; /* 32-bit CRC from flag_version to end of file */
u32 flag_version; /* 0:15 flags, 16:31 version */
u32 offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
};
#define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
#define NVRAM_SPACE 0x8000
#define WINDOW_ADDR 0x1fc00000
#define WINDOW_SIZE 0x400000
#define BUSWIDTH 2
#ifdef CONFIG_SSB
extern struct ssb_bus ssb;
#endif
static struct mtd_info *bcm947xx_mtd;
static void bcm947xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
if (len==1) {
memcpy_fromio(to, map->virt + from, len);
} else {
int i;
u16 *dest = (u16 *) to;
u16 *src = (u16 *) (map->virt + from);
for (i = 0; i < (len / 2); i++) {
dest[i] = src[i];
}
if (len & 1)
*((u8 *)dest+len-1) = src[i] & 0xff;
}
}
static struct map_info bcm947xx_map = {
name: "Physically mapped flash",
size: WINDOW_SIZE,
bankwidth: BUSWIDTH,
phys: WINDOW_ADDR,
};
#ifdef CONFIG_MTD_PARTITIONS
static struct mtd_partition bcm947xx_parts[] = {
{ name: "cfe", offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
{ name: "linux", offset: 0, size: 0, },
{ name: "rootfs", offset: 0, size: 0, },
{ name: "nvram", offset: 0, size: 0, },
{ name: NULL, },
};
static int __init
find_cfe_size(struct mtd_info *mtd, size_t size)
{
struct trx_header *trx;
unsigned char buf[512];
int off;
size_t len;
int blocksize;
trx = (struct trx_header *) buf;
blocksize = mtd->erasesize;
if (blocksize < 0x10000)
blocksize = 0x10000;
for (off = (128*1024); off < size; off += blocksize) {
memset(buf, 0xe5, sizeof(buf));
/*
* Read into buffer
*/
if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
len != sizeof(buf))
continue;
/* found a TRX header */
if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
goto found;
}
}
printk(KERN_NOTICE
"%s: Couldn't find bootloader size\n",
mtd->name);
return -1;
found:
printk(KERN_NOTICE "bootloader size: %d\n", off);
return off;
}
/*
* 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, writhe data to flash.
*/
ret = mtd->write (mtd, pos, len, &retlen, buf);
if (ret)
return ret;
if (retlen != len)
return -EIO;
return 0;
}
static int __init
find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
{
struct trx_header trx, *trx2;
unsigned char buf[512], *block;
int off, blocksize;
u32 i, crc = ~0;
size_t len;
struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
blocksize = mtd->erasesize;
if (blocksize < 0x10000)
blocksize = 0x10000;
for (off = (128*1024); off < size; off += blocksize) {
memset(&trx, 0xe5, sizeof(trx));
/*
* Read into buffer
*/
if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
len != sizeof(trx))
continue;
/* found a TRX header */
if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
part->offset = le32_to_cpu(trx.offsets[2]) ? :
le32_to_cpu(trx.offsets[1]);
part->size = le32_to_cpu(trx.len);
part->size -= part->offset;
part->offset += off;
goto found;
}
}
printk(KERN_NOTICE
"%s: Couldn't find root filesystem\n",
mtd->name);
return -1;
found:
if (part->size == 0)
return 0;
if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
return 0;
/* Move the fs outside of the trx */
part->size = 0;
if (trx.len != part->offset + part->size - off) {
/* Update the trx offsets and length */
trx.len = part->offset + part->size - off;
/* Update the trx crc32 */
for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
return 0;
crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
}
trx.crc32 = crc;
/* read first eraseblock from the trx */
block = kmalloc(mtd->erasesize, GFP_KERNEL);
trx2 = (struct trx_header *) block;
if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
printk("Error accessing the first trx eraseblock\n");
return 0;
}
printk("Updating TRX offsets and length:\n");
printk("old trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n", trx2->offsets[0], trx2->offsets[1], trx2->offsets[2], trx2->len, trx2->crc32);
printk("new trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n", trx.offsets[0], trx.offsets[1], trx.offsets[2], trx.len, trx.crc32);
/* Write updated trx header to the flash */
memcpy(block, &trx, sizeof(trx));
if (mtd->unlock)
mtd->unlock(mtd, off, mtd->erasesize);
erase_write(mtd, off, mtd->erasesize, block);
if (mtd->sync)
mtd->sync(mtd);
kfree(block);
printk("Done\n");
}
return part->size;
}
struct mtd_partition * __init
init_mtd_partitions(struct mtd_info *mtd, size_t size)
{
int cfe_size;
if ((cfe_size = find_cfe_size(mtd,size)) < 0)
return NULL;
/* boot loader */
bcm947xx_parts[0].offset = 0;
bcm947xx_parts[0].size = cfe_size;
/* nvram */
if (cfe_size != 384 * 1024) {
bcm947xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
bcm947xx_parts[3].size = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
} else {
/* nvram (old 128kb config partition on netgear wgt634u) */
bcm947xx_parts[3].offset = bcm947xx_parts[0].size;
bcm947xx_parts[3].size = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
}
/* linux (kernel and rootfs) */
if (cfe_size != 384 * 1024) {
bcm947xx_parts[1].offset = bcm947xx_parts[0].size;
bcm947xx_parts[1].size = bcm947xx_parts[3].offset -
bcm947xx_parts[1].offset;
} else {
/* do not count the elf loader, which is on one block */
bcm947xx_parts[1].offset = bcm947xx_parts[0].size +
bcm947xx_parts[3].size + mtd->erasesize;
bcm947xx_parts[1].size = size -
bcm947xx_parts[0].size -
(2*bcm947xx_parts[3].size) -
mtd->erasesize;
}
/* find and size rootfs */
find_root(mtd,size,&bcm947xx_parts[2]);
bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset - bcm947xx_parts[3].size;
return bcm947xx_parts;
}
#endif
int __init init_bcm947xx_map(void)
{
#ifdef CONFIG_SSB
struct ssb_mipscore *mcore = &ssb.mipscore;
#endif
size_t size;
int ret = 0;
#ifdef CONFIG_MTD_PARTITIONS
struct mtd_partition *parts;
int i;
#endif
#ifdef CONFIG_SSB
u32 window = mcore->flash_window;
u32 window_size = mcore->flash_window_size;
printk("flash init: 0x%08x 0x%08x\n", window, window_size);
bcm947xx_map.phys = window;
bcm947xx_map.size = window_size;
bcm947xx_map.virt = ioremap_nocache(window, window_size);
#else
printk("flash init: 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
bcm947xx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
#endif
if (!bcm947xx_map.virt) {
printk("Failed to ioremap\n");
return -EIO;
}
simple_map_init(&bcm947xx_map);
if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
printk("Failed to do_map_probe\n");
iounmap((void *)bcm947xx_map.virt);
return -ENXIO;
}
/* override copy_from routine */
bcm947xx_map.copy_from = bcm947xx_map_copy_from;
bcm947xx_mtd->owner = THIS_MODULE;
size = bcm947xx_mtd->size;
printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
#ifdef CONFIG_MTD_PARTITIONS
parts = init_mtd_partitions(bcm947xx_mtd, size);
for (i = 0; parts[i].name; i++);
ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
if (ret) {
printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
goto fail;
}
#endif
return 0;
fail:
if (bcm947xx_mtd)
map_destroy(bcm947xx_mtd);
if (bcm947xx_map.virt)
iounmap((void *)bcm947xx_map.virt);
bcm947xx_map.virt = 0;
return ret;
}
void __exit cleanup_bcm947xx_map(void)
{
#ifdef CONFIG_MTD_PARTITIONS
del_mtd_partitions(bcm947xx_mtd);
#endif
map_destroy(bcm947xx_mtd);
iounmap((void *)bcm947xx_map.virt);
}
module_init(init_bcm947xx_map);
module_exit(cleanup_bcm947xx_map);
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