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openwrt-mirror/target/linux/brcm47xx/patches-3.2/0017-mtd-bcm47xx-add-bcm47xx-part-parser.patch
Hauke Mehrtens 034cf5643f brcm47xx: add support for kernel 3.2 
SVN-Revision: 29756
2012-01-15 21:18:34 +00:00

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From d50d2d8e3ab5446f791deff0cb78820989ed93e7 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 17 Jul 2011 14:54:11 +0200
Subject: [PATCH 06/19] mtd: bcm47xx: add bcm47xx part parser
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
drivers/mtd/Kconfig | 7 +
drivers/mtd/Makefile | 1 +
drivers/mtd/bcm47xxpart.c | 542 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 550 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/bcm47xxpart.c
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -164,6 +164,13 @@ config MTD_MYLOADER_PARTS
You will still need the parsing functions to be called by the driver
for your particular device. It won't happen automatically.
+config MTD_BCM47XX_PARTS
+ tristate "BCM47XX partitioning support"
+ default y
+ depends on BCM47XX
+ ---help---
+ bcm47XX partitioning support
+
comment "User Modules And Translation Layers"
config MTD_CHAR
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdli
obj-$(CONFIG_MTD_AFS_PARTS) += afs.o
obj-$(CONFIG_MTD_AR7_PARTS) += ar7part.o
obj-$(CONFIG_MTD_MYLOADER_PARTS) += myloader.o
+obj-$(CONFIG_MTD_BCM47XX_PARTS) += bcm47xxpart.o
# 'Users' - code which presents functionality to userspace.
obj-$(CONFIG_MTD_CHAR) += mtdchar.o
--- /dev/null
+++ b/drivers/mtd/bcm47xxpart.c
@@ -0,0 +1,542 @@
+/*
+ * 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
+ */
+
+#define pr_fmt(fmt) "bcm47xx_part: " fmt
+#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/partitions.h>
+#include <linux/crc32.h>
+#include <linux/io.h>
+#include <asm/mach-bcm47xx/nvram.h>
+#include <asm/mach-bcm47xx/bcm47xx.h>
+#include <asm/fw/cfe/cfe_api.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 */
+};
+
+/* for Edimax Print servers which use an additional header
+ * then the firmware on flash looks like :
+ * EDIMAX HEADER | TRX HEADER
+ * As this header is 12 bytes long we have to handle it
+ * and skip it to find the TRX header
+ */
+#define EDIMAX_PS_HEADER_MAGIC 0x36315350 /* "PS16" */
+#define EDIMAX_PS_HEADER_LEN 0xc /* 12 bytes long for edimax header */
+
+#define NVRAM_SPACE 0x8000
+
+#define ROUTER_NETGEAR_WGR614L 1
+#define ROUTER_NETGEAR_WNR834B 2
+#define ROUTER_NETGEAR_WNDR3300 3
+#define ROUTER_NETGEAR_WNR3500L 4
+#define ROUTER_SIMPLETECH_SIMPLESHARE 5
+#define ROUTER_NETGEAR_WNDR3400 6
+
+static int
+find_cfe_size(struct mtd_info *mtd)
+{
+ 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 < mtd->size; off += blocksize) {
+ memset(buf, 0xe5, sizeof(buf));
+
+ /*
+ * Read into buffer
+ */
+ if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
+ len != sizeof(buf))
+ continue;
+
+ if (le32_to_cpu(trx->magic) == EDIMAX_PS_HEADER_MAGIC) {
+ if (mtd->read(mtd, off + EDIMAX_PS_HEADER_LEN,
+ sizeof(buf), &len, buf) || len != sizeof(buf)) {
+ continue;
+ } else {
+ pr_notice("Found edimax header\n");
+ }
+ }
+
+ /* found a TRX header */
+ if (le32_to_cpu(trx->magic) == TRX_MAGIC)
+ goto found;
+ }
+
+ pr_notice("%s: Couldn't find bootloader size\n", mtd->name);
+ return -1;
+
+ found:
+ pr_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);
+ pr_warn("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;
+}
+
+
+static int
+find_dual_image_off(struct mtd_info *mtd)
+{
+ struct trx_header trx;
+ int off, blocksize;
+ size_t len;
+
+ blocksize = mtd->erasesize;
+ if (blocksize < 0x10000)
+ blocksize = 0x10000;
+
+ for (off = (128*1024); off < mtd->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 last TRX header */
+ if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
+ if (le32_to_cpu(trx.flag_version >> 16) == 2) {
+ pr_notice("dual image TRX header found\n");
+ return mtd->size / 2;
+ } else {
+ return 0;
+ }
+ }
+ }
+ return 0;
+}
+
+
+static int
+find_root(struct mtd_info *mtd, struct mtd_partition *part)
+{
+ struct trx_header trx, *trx2;
+ unsigned char buf[512], *block;
+ int off, blocksize, trxoff = 0;
+ u32 i, crc = ~0;
+ size_t len;
+ bool edimax = false;
+
+ blocksize = mtd->erasesize;
+ if (blocksize < 0x10000)
+ blocksize = 0x10000;
+
+ for (off = (128*1024); off < mtd->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 an edimax header */
+ if (le32_to_cpu(trx.magic) == EDIMAX_PS_HEADER_MAGIC) {
+ /* read the correct trx header */
+ if (mtd->read(mtd, off + EDIMAX_PS_HEADER_LEN,
+ sizeof(trx), &len, (char *) &trx) ||
+ len != sizeof(trx)) {
+ continue;
+ } else {
+ pr_notice("Found an edimax ps header\n");
+ edimax = true;
+ }
+ }
+
+ /* 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;
+ if (edimax) {
+ off += EDIMAX_PS_HEADER_LEN;
+ trxoff = EDIMAX_PS_HEADER_LEN;
+ }
+
+ goto found;
+ }
+ }
+
+ pr_warn("%s: Couldn't find root filesystem\n",
+ mtd->name);
+ return -1;
+
+ found:
+ pr_notice("TRX offset : %x\n", trxoff);
+ 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 - trxoff, mtd->erasesize, &len, block) || len != mtd->erasesize) {
+ pr_err("Error accessing the first trx eraseblock\n");
+ return 0;
+ }
+
+ pr_notice("Updating TRX offsets and length:\n");
+ pr_notice("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);
+ pr_notice("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 + trxoff, &trx, sizeof(trx));
+ if (mtd->unlock)
+ mtd->unlock(mtd, off - trxoff, mtd->erasesize);
+ erase_write(mtd, off - trxoff, mtd->erasesize, block);
+ if (mtd->sync)
+ mtd->sync(mtd);
+ kfree(block);
+ pr_notice("Done\n");
+ }
+
+ return part->size;
+}
+
+static int get_router(void)
+{
+ char buf[20];
+ u32 boardnum = 0;
+ u16 boardtype = 0;
+ u16 boardrev = 0;
+ u32 boardflags = 0;
+ u16 sdram_init = 0;
+ u16 cardbus = 0;
+ u16 strev = 0;
+
+ if (nvram_getenv("boardnum", buf, sizeof(buf)) >= 0)
+ boardnum = simple_strtoul(buf, NULL, 0);
+ if (nvram_getenv("boardtype", buf, sizeof(buf)) >= 0)
+ boardtype = simple_strtoul(buf, NULL, 0);
+ if (nvram_getenv("boardrev", buf, sizeof(buf)) >= 0)
+ boardrev = simple_strtoul(buf, NULL, 0);
+ if (nvram_getenv("boardflags", buf, sizeof(buf)) >= 0)
+ boardflags = simple_strtoul(buf, NULL, 0);
+ if (nvram_getenv("sdram_init", buf, sizeof(buf)) >= 0)
+ sdram_init = simple_strtoul(buf, NULL, 0);
+ if (nvram_getenv("cardbus", buf, sizeof(buf)) >= 0)
+ cardbus = simple_strtoul(buf, NULL, 0);
+ if (nvram_getenv("st_rev", buf, sizeof(buf)) >= 0)
+ strev = simple_strtoul(buf, NULL, 0);
+
+ if ((boardnum == 8 || boardnum == 01)
+ && boardtype == 0x0472 && cardbus == 1) {
+ /* Netgear WNR834B, Netgear WNR834Bv2 */
+ return ROUTER_NETGEAR_WNR834B;
+ }
+
+ if (boardnum == 01 && boardtype == 0x0472 && boardrev == 0x23) {
+ /* Netgear WNDR-3300 */
+ return ROUTER_NETGEAR_WNDR3300;
+ }
+
+ if ((boardnum == 83258 || boardnum == 01)
+ && boardtype == 0x048e
+ && (boardrev == 0x11 || boardrev == 0x10)
+ && boardflags == 0x750
+ && sdram_init == 0x000A) {
+ /* Netgear WGR614v8/L/WW 16MB ram, cfe v1.3 or v1.5 */
+ return ROUTER_NETGEAR_WGR614L;
+ }
+
+ if ((boardnum == 1 || boardnum == 3500)
+ && boardtype == 0x04CF
+ && (boardrev == 0x1213 || boardrev == 02)) {
+ /* Netgear WNR3500v2/U/L */
+ return ROUTER_NETGEAR_WNR3500L;
+ }
+
+ if (boardnum == 1 && boardtype == 0xb4cf && boardrev == 0x1100) {
+ /* Netgear WNDR3400 */
+ return ROUTER_NETGEAR_WNDR3400;
+ }
+
+ if (boardtype == 0x042f
+ && boardrev == 0x10
+ && boardflags == 0
+ && strev == 0x11) {
+ /* Simpletech Simpleshare */
+ return ROUTER_SIMPLETECH_SIMPLESHARE;
+ }
+
+ return 0;
+}
+
+static int parse_bcm47xx_partitions(struct mtd_info *mtd,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+{
+ int cfe_size;
+ int dual_image_offset = 0;
+ /* e.g Netgear 0x003e0000-0x003f0000 : "board_data", we exclude this
+ * part from our mapping to prevent overwriting len/checksum on e.g.
+ * Netgear WGR614v8/L/WW
+ */
+ int custom_data_size = 0;
+ struct mtd_partition *bcm47xx_parts;
+
+ cfe_size = find_cfe_size(mtd);
+ if (cfe_size < 0)
+ return 0;
+
+ bcm47xx_parts = kzalloc(sizeof(struct mtd_partition) * 6, GFP_KERNEL);
+
+ bcm47xx_parts[0].name = "cfe";
+ bcm47xx_parts[1].name = "linux";
+ bcm47xx_parts[2].name = "rootfs";
+ bcm47xx_parts[3].name = "nvram";
+
+ /* boot loader */
+ bcm47xx_parts[0].mask_flags = MTD_WRITEABLE;
+ bcm47xx_parts[0].offset = 0;
+ bcm47xx_parts[0].size = cfe_size;
+
+ /* nvram */
+ if (cfe_size != 384 * 1024) {
+
+ switch (get_router()) {
+ case ROUTER_NETGEAR_WGR614L:
+ case ROUTER_NETGEAR_WNR834B:
+ case ROUTER_NETGEAR_WNDR3300:
+ case ROUTER_NETGEAR_WNR3500L:
+ case ROUTER_NETGEAR_WNDR3400:
+ /* Netgear: checksum is @ 0x003AFFF8 for 4M flash or checksum
+ * is @ 0x007AFFF8 for 8M flash
+ */
+ custom_data_size = mtd->erasesize;
+
+ bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
+ bcm47xx_parts[3].size = roundup(NVRAM_SPACE, mtd->erasesize);
+
+ /* Place CFE board_data into a partition */
+ bcm47xx_parts[4].name = "board_data";
+ bcm47xx_parts[4].offset = bcm47xx_parts[3].offset - custom_data_size;
+ bcm47xx_parts[4].size = custom_data_size;
+ break;
+
+ case ROUTER_SIMPLETECH_SIMPLESHARE:
+ /* Fixup Simpletech Simple share nvram */
+
+ pr_notice("Setting up simpletech nvram\n");
+ custom_data_size = mtd->erasesize;
+
+ bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize) * 2;
+ bcm47xx_parts[3].size = roundup(NVRAM_SPACE, mtd->erasesize);
+
+ /* Place backup nvram into a partition */
+ bcm47xx_parts[4].name = "nvram_copy";
+ bcm47xx_parts[4].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
+ bcm47xx_parts[4].size = roundup(NVRAM_SPACE, mtd->erasesize);
+ break;
+
+ default:
+ bcm47xx_parts[3].offset = mtd->size - roundup(NVRAM_SPACE, mtd->erasesize);
+ bcm47xx_parts[3].size = roundup(NVRAM_SPACE, mtd->erasesize);
+ }
+
+ } else {
+ /* nvram (old 128kb config partition on netgear wgt634u) */
+ bcm47xx_parts[3].offset = bcm47xx_parts[0].size;
+ bcm47xx_parts[3].size = roundup(NVRAM_SPACE, mtd->erasesize);
+ }
+
+ /* dual image offset*/
+ pr_notice("Looking for dual image\n");
+ dual_image_offset = find_dual_image_off(mtd);
+ /* linux (kernel and rootfs) */
+ if (cfe_size != 384 * 1024) {
+ if (get_router() == ROUTER_SIMPLETECH_SIMPLESHARE) {
+ bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
+ bcm47xx_parts[1].size = bcm47xx_parts[4].offset - dual_image_offset -
+ bcm47xx_parts[1].offset - custom_data_size;
+ } else {
+ bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
+ bcm47xx_parts[1].size = bcm47xx_parts[3].offset - dual_image_offset -
+ bcm47xx_parts[1].offset - custom_data_size;
+ }
+ } else {
+ /* do not count the elf loader, which is on one block */
+ bcm47xx_parts[1].offset = bcm47xx_parts[0].size +
+ bcm47xx_parts[3].size + mtd->erasesize;
+ bcm47xx_parts[1].size = mtd->size -
+ bcm47xx_parts[0].size -
+ (2*bcm47xx_parts[3].size) -
+ mtd->erasesize - custom_data_size;
+ }
+
+ /* find and size rootfs */
+ find_root(mtd, &bcm47xx_parts[2]);
+ bcm47xx_parts[2].size = mtd->size - dual_image_offset -
+ bcm47xx_parts[2].offset -
+ bcm47xx_parts[3].size - custom_data_size;
+ *pparts = bcm47xx_parts;
+ return bcm47xx_parts[4].name == NULL ? 4 : 5;
+}
+
+static struct mtd_part_parser bcm47xx_parser = {
+ .owner = THIS_MODULE,
+ .parse_fn = parse_bcm47xx_partitions,
+ .name = "bcm47xx",
+};
+
+static int __init bcm47xx_parser_init(void)
+{
+ return register_mtd_parser(&bcm47xx_parser);
+}
+
+static void __exit bcm47xx_parser_exit(void)
+{
+ deregister_mtd_parser(&bcm47xx_parser);
+}
+
+module_init(bcm47xx_parser_init);
+module_exit(bcm47xx_parser_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Parsing code for flash partitions on bcm47xx SoCs");
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