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openwrt/target/linux/brcm47xx-2.6/patches/110-flash_map.patch
Felix Fietkau b266b01045 Add initial version of the brcm-2.6 rewrite, called brcm47xx-2.6 to better distinguish it from 63xx. 
Boots on WGT643U, includes ethernet support, but doesn't do much otherwise.
Thanks to Michael Buesch for his SSB (Sonics SiliconBackplane) work
and Vladdy for some fixes and porting to 2.6.19.

SVN-Revision: 6015
2007-01-07 15:35:36 +00:00

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diff -urN linux.old/drivers/mtd/maps/bcm47xx-flash.c linux.dev/drivers/mtd/maps/bcm47xx-flash.c
--- linux.old/drivers/mtd/maps/bcm47xx-flash.c 1970-01-01 01:00:00.000000000 +0100
+++ linux.dev/drivers/mtd/maps/bcm47xx-flash.c 2007-01-03 02:26:02.000000000 +0100
@@ -0,0 +1,471 @@
+/*
+ * 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/wait.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#ifdef CONFIG_MTD_PARTITIONS
+#include <linux/mtd/partitions.h>
+#endif
+#include <linux/squashfs_fs.h>
+#include <linux/jffs2.h>
+#include <linux/crc32.h>
+#include <linux/ssb.h>
+#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
+
+extern struct ssb_bus ssb;
+static struct mtd_info *bcm947xx_mtd;
+
+static void bcm947xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+#define MIPS_MEMCPY_ALIGN 4
+ map_word ret;
+ ssize_t transfer;
+ ssize_t done = 0;
+ if ((len >= MIPS_MEMCPY_ALIGN) && (!(from & (MIPS_MEMCPY_ALIGN - 1))) && (!(((unsigned int)to & (MIPS_MEMCPY_ALIGN - 1))))) {
+ done = len & ~(MIPS_MEMCPY_ALIGN - 1);
+ memcpy_fromio(to, map->virt + from, done);
+ }
+ while (done < len) {
+ ret = map->read(map, from + done);
+ transfer = len - done;
+ if (transfer > map->bankwidth)
+ transfer = map->bankwidth;
+ memcpy((void *)((unsigned long)to + done), &ret.x[0], transfer);
+ done += transfer;
+ }
+}
+
+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: "OpenWrt", 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;
+
+ if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
+ printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", mtd->name, (u32) sb->bytes_used);
+
+ /* Update the squashfs partition size based on the superblock info */
+ part->size = sb->bytes_used;
+ len = part->offset + part->size;
+ len += (mtd->erasesize - 1);
+ len &= ~(mtd->erasesize - 1);
+ part->size = len - part->offset;
+ } else if (*((__u16 *) buf) == JFFS2_MAGIC_BITMASK) {
+ printk(KERN_INFO "%s: Filesystem type: jffs2\n", mtd->name);
+
+ /* Move the squashfs outside of the trx */
+ part->size = 0;
+ } else {
+ printk(KERN_INFO "%s: Filesystem type: unknown\n", mtd->name);
+ return 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 */
+ if (find_root(mtd,size,&bcm947xx_parts[2])==0) {
+ /* entirely jffs2 */
+ bcm947xx_parts[4].name = NULL;
+ bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset -
+ bcm947xx_parts[3].size;
+ } else {
+ /* legacy setup */
+ /* calculate leftover flash, and assign it to the jffs2 partition */
+ if (cfe_size != 384 * 1024) {
+ bcm947xx_parts[4].offset = bcm947xx_parts[2].offset +
+ bcm947xx_parts[2].size;
+ if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
+ bcm947xx_parts[4].offset += mtd->erasesize -
+ (bcm947xx_parts[4].offset % mtd->erasesize);
+ }
+ bcm947xx_parts[4].size = bcm947xx_parts[3].offset -
+ bcm947xx_parts[4].offset;
+ } else {
+ bcm947xx_parts[4].offset = bcm947xx_parts[2].offset +
+ bcm947xx_parts[2].size;
+ if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
+ bcm947xx_parts[4].offset += mtd->erasesize -
+ (bcm947xx_parts[4].offset % mtd->erasesize);
+ }
+ bcm947xx_parts[4].size = size - bcm947xx_parts[3].size -
+ bcm947xx_parts[4].offset;
+ }
+ }
+
+ return bcm947xx_parts;
+}
+#endif
+
+int __init init_bcm947xx_map(void)
+{
+ struct ssb_mipscore *mcore = &ssb.mipscore;
+ size_t size;
+ int ret = 0;
+#ifdef CONFIG_MTD_PARTITIONS
+ struct mtd_partition *parts;
+ int i;
+#endif
+ 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.virt = ioremap(window, window_size);
+
+ if (!bcm947xx_map.virt) {
+ printk("Failed to ioremap\n");
+ return -EIO;
+ }
+ simple_map_init(&bcm947xx_map);
+
+ bcm947xx_map.copy_from = bcm947xx_map_copy_from;
+
+ if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
+ printk("Failed to do_map_probe\n");
+ iounmap((void *)bcm947xx_map.virt);
+ return -ENXIO;
+ }
+
+ 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);
diff -urN linux.old/drivers/mtd/maps/Kconfig linux.dev/drivers/mtd/maps/Kconfig
--- linux.old/drivers/mtd/maps/Kconfig 2006-12-11 20:32:53.000000000 +0100
+++ linux.dev/drivers/mtd/maps/Kconfig 2007-01-03 02:26:02.000000000 +0100
@@ -299,6 +299,12 @@
Mapping for the Flaga digital module. If you don't have one, ignore
this setting.
+config MTD_BCM47XX
+ tristate "BCM47xx flash device"
+ depends on MIPS && MTD_CFI && BCM947XX
+ help
+ Support for the flash chips on the BCM947xx board.
+
config MTD_BEECH
tristate "CFI Flash device mapped on IBM 405LP Beech"
depends on MTD_CFI && BEECH
diff -urN linux.old/drivers/mtd/maps/Makefile linux.dev/drivers/mtd/maps/Makefile
--- linux.old/drivers/mtd/maps/Makefile 2006-12-11 20:32:53.000000000 +0100
+++ linux.dev/drivers/mtd/maps/Makefile 2007-01-03 02:26:02.000000000 +0100
@@ -29,6 +29,7 @@
obj-$(CONFIG_MTD_PCMCIA) += pcmciamtd.o
obj-$(CONFIG_MTD_RPXLITE) += rpxlite.o
obj-$(CONFIG_MTD_TQM8XXL) += tqm8xxl.o
+obj-$(CONFIG_MTD_BCM47XX) += bcm47xx-flash.o
obj-$(CONFIG_MTD_SA1100) += sa1100-flash.o
obj-$(CONFIG_MTD_IPAQ) += ipaq-flash.o
obj-$(CONFIG_MTD_SBC_GXX) += sbc_gxx.o
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