path: root/target/linux/brcm47xx/patches-3.2/025-mtd-bcm47xx-add-bcm47xx-part-parser.patch

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");