diff options
Diffstat (limited to 'target/linux/brcm-2.4/files/drivers/mtd/maps')
| -rw-r--r-- | target/linux/brcm-2.4/files/drivers/mtd/maps/bcm947xx-flash.c | 504 |
1 files changed, 504 insertions, 0 deletions
diff --git a/target/linux/brcm-2.4/files/drivers/mtd/maps/bcm947xx-flash.c b/target/linux/brcm-2.4/files/drivers/mtd/maps/bcm947xx-flash.c new file mode 100644 index 000000000..ee0256366 --- /dev/null +++ b/target/linux/brcm-2.4/files/drivers/mtd/maps/bcm947xx-flash.c @@ -0,0 +1,504 @@ +/* + * 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 BCM947XX boards + * + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.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/config.h> +#include <linux/squashfs_fs.h> +#include <linux/jffs2.h> +#include <linux/crc32.h> +#include <asm/io.h> + +#include <typedefs.h> +#include <osl.h> +#include <bcmnvram.h> +#include <bcmutils.h> +#include <sbconfig.h> +#include <sbchipc.h> +#include <sbutils.h> +#include <trxhdr.h> + +/* Global SB handle */ +extern void *bcm947xx_sbh; +extern spinlock_t bcm947xx_sbh_lock; + +/* Convenience */ +#define sbh bcm947xx_sbh +#define sbh_lock bcm947xx_sbh_lock + +#define WINDOW_ADDR 0x1fc00000 +#define WINDOW_SIZE 0x400000 +#define BUSWIDTH 2 + +static struct mtd_info *bcm947xx_mtd; + +__u8 bcm947xx_map_read8(struct map_info *map, unsigned long ofs) +{ + if (map->map_priv_2 == 1) + return __raw_readb(map->map_priv_1 + ofs); + + u16 val = __raw_readw(map->map_priv_1 + (ofs & ~1)); + if (ofs & 1) + return ((val >> 8) & 0xff); + else + return (val & 0xff); +} + +__u16 bcm947xx_map_read16(struct map_info *map, unsigned long ofs) +{ + return __raw_readw(map->map_priv_1 + ofs); +} + +__u32 bcm947xx_map_read32(struct map_info *map, unsigned long ofs) +{ + return __raw_readl(map->map_priv_1 + ofs); +} + +void bcm947xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) +{ + if (len==1) { + memcpy_fromio(to, map->map_priv_1 + from, len); + } else { + int i; + u16 *dest = (u16 *) to; + u16 *src = (u16 *) (map->map_priv_1 + from); + for (i = 0; i < (len / 2); i++) { + dest[i] = src[i]; + } + if (len & 1) + *((u8 *)dest+len-1) = src[i] & 0xff; + } +} + +void bcm947xx_map_write8(struct map_info *map, __u8 d, unsigned long adr) +{ + __raw_writeb(d, map->map_priv_1 + adr); + mb(); +} + +void bcm947xx_map_write16(struct map_info *map, __u16 d, unsigned long adr) +{ + __raw_writew(d, map->map_priv_1 + adr); + mb(); +} + +void bcm947xx_map_write32(struct map_info *map, __u32 d, unsigned long adr) +{ + __raw_writel(d, map->map_priv_1 + adr); + mb(); +} + +void bcm947xx_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) +{ + memcpy_toio(map->map_priv_1 + to, from, len); +} + +struct map_info bcm947xx_map = { + name: "Physically mapped flash", + size: WINDOW_SIZE, + buswidth: BUSWIDTH, + read8: bcm947xx_map_read8, + read16: bcm947xx_map_read16, + read32: bcm947xx_map_read32, + copy_from: bcm947xx_map_copy_from, + write8: bcm947xx_map_write8, + write16: bcm947xx_map_write16, + write32: bcm947xx_map_write32, + copy_to: bcm947xx_map_copy_to +}; + +#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 filesystem 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 */ + trx2 = block = kmalloc(mtd->erasesize, GFP_KERNEL); + 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_root(mtd,size,&bcm947xx_parts[2]); + bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset - bcm947xx_parts[3].size; + + return bcm947xx_parts; +} + +#endif + + +mod_init_t init_bcm947xx_map(void) +{ + ulong flags; + uint coreidx; + chipcregs_t *cc; + uint32 fltype; + uint window_addr = 0, window_size = 0; + size_t size; + int ret = 0; +#ifdef CONFIG_MTD_PARTITIONS + struct mtd_partition *parts; + int i; +#endif + + spin_lock_irqsave(&sbh_lock, flags); + coreidx = sb_coreidx(sbh); + + /* Check strapping option if chipcommon exists */ + if ((cc = sb_setcore(sbh, SB_CC, 0))) { + fltype = readl(&cc->capabilities) & CAP_FLASH_MASK; + if (fltype == PFLASH) { + bcm947xx_map.map_priv_2 = 1; + window_addr = 0x1c000000; + bcm947xx_map.size = window_size = 32 * 1024 * 1024; + if ((readl(&cc->flash_config) & CC_CFG_DS) == 0) + bcm947xx_map.buswidth = 1; + } + } else { + fltype = PFLASH; + bcm947xx_map.map_priv_2 = 0; + window_addr = WINDOW_ADDR; + window_size = WINDOW_SIZE; + } + + sb_setcoreidx(sbh, coreidx); + spin_unlock_irqrestore(&sbh_lock, flags); + + if (fltype != PFLASH) { + printk(KERN_ERR "pflash: found no supported devices\n"); + ret = -ENODEV; + goto fail; + } + + bcm947xx_map.map_priv_1 = (unsigned long) ioremap(window_addr, window_size); + + if (!bcm947xx_map.map_priv_1) { + printk(KERN_ERR "Failed to ioremap\n"); + return -EIO; + } + + if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) { + printk(KERN_ERR "pflash: cfi_probe failed\n"); + iounmap((void *)bcm947xx_map.map_priv_1); + return -ENXIO; + } + + bcm947xx_mtd->module = 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.map_priv_1) + iounmap((void *) bcm947xx_map.map_priv_1); + bcm947xx_map.map_priv_1 = 0; + return ret; +} + +mod_exit_t cleanup_bcm947xx_map(void) +{ +#ifdef CONFIG_MTD_PARTITIONS + del_mtd_partitions(bcm947xx_mtd); +#endif + map_destroy(bcm947xx_mtd); + iounmap((void *) bcm947xx_map.map_priv_1); + bcm947xx_map.map_priv_1 = 0; +} + +module_init(init_bcm947xx_map); +module_exit(cleanup_bcm947xx_map); |