mtd: add Broadcom BCM63xx image tag partition parser
This patch adds support for parsing Broadcom BCM63xx image tag format and creating MTD partitions accordingly. This driver is a platform_device which can be instantiated accordingly by bcm63xx board support code. Signed-off-by: Daniel Dickinson <cshore@csolve.net> Signed-off-by: Mike Albon <malbon@openwrt.org> Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Florian Fainelli
David Woodhouse
parent
5e59be1f35
commit
bc49c28962
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@ -0,0 +1,97 @@
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#ifndef __BCM963XX_TAG_H
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#define __BCM963XX_TAG_H
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#define TAGVER_LEN 4 /* Length of Tag Version */
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#define TAGLAYOUT_LEN 4 /* Length of FlashLayoutVer */
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#define SIG1_LEN 20 /* Company Signature 1 Length */
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#define SIG2_LEN 14 /* Company Signature 2 Lenght */
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#define BOARDID_LEN 16 /* Length of BoardId */
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#define ENDIANFLAG_LEN 2 /* Endian Flag Length */
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#define CHIPID_LEN 6 /* Chip Id Length */
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#define IMAGE_LEN 10 /* Length of Length Field */
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#define ADDRESS_LEN 12 /* Length of Address field */
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#define DUALFLAG_LEN 2 /* Dual Image flag Length */
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#define INACTIVEFLAG_LEN 2 /* Inactie Flag Length */
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#define RSASIG_LEN 20 /* Length of RSA Signature in tag */
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#define TAGINFO1_LEN 30 /* Length of vendor information field1 in tag */
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#define FLASHLAYOUTVER_LEN 4 /* Length of Flash Layout Version String tag */
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#define TAGINFO2_LEN 16 /* Length of vendor information field2 in tag */
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#define CRC_LEN 4 /* Length of CRC in bytes */
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#define ALTTAGINFO_LEN 54 /* Alternate length for vendor information; Pirelli */
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#define NUM_PIRELLI 2
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#define IMAGETAG_CRC_START 0xFFFFFFFF
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#define PIRELLI_BOARDS { \
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"AGPF-S0", \
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"DWV-S0", \
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}
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/*
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* The broadcom firmware assumes the rootfs starts the image,
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* therefore uses the rootfs start (flash_image_address)
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* to determine where to flash the image. Since we have the kernel first
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* we have to give it the kernel address, but the crc uses the length
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* associated with this address (root_length), which is added to the kernel
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* length (kernel_length) to determine the length of image to flash and thus
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* needs to be rootfs + deadcode (jffs2 EOF marker)
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*/
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struct bcm_tag {
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/* 0-3: Version of the image tag */
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char tag_version[TAGVER_LEN];
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/* 4-23: Company Line 1 */
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char sig_1[SIG1_LEN];
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/* 24-37: Company Line 2 */
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char sig_2[SIG2_LEN];
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/* 38-43: Chip this image is for */
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char chip_id[CHIPID_LEN];
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/* 44-59: Board name */
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char board_id[BOARDID_LEN];
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/* 60-61: Map endianness -- 1 BE 0 LE */
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char big_endian[ENDIANFLAG_LEN];
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/* 62-71: Total length of image */
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char total_length[IMAGE_LEN];
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/* 72-83: Address in memory of CFE */
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char cfe__address[ADDRESS_LEN];
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/* 84-93: Size of CFE */
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char cfe_length[IMAGE_LEN];
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/* 94-105: Address in memory of image start
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* (kernel for OpenWRT, rootfs for stock firmware)
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*/
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char flash_image_start[ADDRESS_LEN];
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/* 106-115: Size of rootfs */
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char root_length[IMAGE_LEN];
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/* 116-127: Address in memory of kernel */
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char kernel_address[ADDRESS_LEN];
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/* 128-137: Size of kernel */
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char kernel_length[IMAGE_LEN];
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/* 138-139: Unused at the moment */
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char dual_image[DUALFLAG_LEN];
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/* 140-141: Unused at the moment */
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char inactive_flag[INACTIVEFLAG_LEN];
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/* 142-161: RSA Signature (not used; some vendors may use this) */
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char rsa_signature[RSASIG_LEN];
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/* 162-191: Compilation and related information (not used in OpenWrt) */
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char information1[TAGINFO1_LEN];
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/* 192-195: Version flash layout */
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char flash_layout_ver[FLASHLAYOUTVER_LEN];
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/* 196-199: kernel+rootfs CRC32 */
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char fskernel_crc[CRC_LEN];
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/* 200-215: Unused except on Alice Gate where is is information */
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char information2[TAGINFO2_LEN];
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/* 216-219: CRC32 of image less imagetag (kernel for Alice Gate) */
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char image_crc[CRC_LEN];
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/* 220-223: CRC32 of rootfs partition */
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char rootfs_crc[CRC_LEN];
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/* 224-227: CRC32 of kernel partition */
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char kernel_crc[CRC_LEN];
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/* 228-235: Unused at present */
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char reserved1[8];
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/* 236-239: CRC32 of header excluding tagVersion */
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char header_crc[CRC_LEN];
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/* 240-255: Unused at present */
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char reserved2[16];
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};
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#endif /* __BCM63XX_TAG_H */
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@ -251,6 +251,15 @@ config MTD_NETtel
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help
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Support for flash chips on NETtel/SecureEdge/SnapGear boards.
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config MTD_BCM963XX
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tristate "Map driver for Broadcom BCM963xx boards"
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depends on BCM63XX
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select MTD_MAP_BANK_WIDTH_2
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select MTD_CFI_I1
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help
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Support for parsing CFE image tag and creating MTD partitions on
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Broadcom BCM63xx boards.
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config MTD_DILNETPC
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tristate "CFI Flash device mapped on DIL/Net PC"
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depends on X86 && MTD_CONCAT && MTD_PARTITIONS && MTD_CFI_INTELEXT && BROKEN
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@ -58,3 +58,4 @@ obj-$(CONFIG_MTD_BFIN_ASYNC) += bfin-async-flash.o
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obj-$(CONFIG_MTD_RBTX4939) += rbtx4939-flash.o
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obj-$(CONFIG_MTD_VMU) += vmu-flash.o
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obj-$(CONFIG_MTD_GPIO_ADDR) += gpio-addr-flash.o
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obj-$(CONFIG_MTD_BCM963XX) += bcm963xx-flash.o
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@ -0,0 +1,271 @@
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/*
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* Copyright © 2006-2008 Florian Fainelli <florian@openwrt.org>
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* Mike Albon <malbon@openwrt.org>
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* Copyright © 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/vmalloc.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <asm/mach-bcm63xx/bcm963xx_tag.h>
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#define BCM63XX_BUSWIDTH 2 /* Buswidth */
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#define BCM63XX_EXTENDED_SIZE 0xBFC00000 /* Extended flash address */
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#define PFX KBUILD_MODNAME ": "
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static struct mtd_partition *parsed_parts;
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static struct mtd_info *bcm963xx_mtd_info;
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static struct map_info bcm963xx_map = {
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.name = "bcm963xx",
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.bankwidth = BCM63XX_BUSWIDTH,
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};
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static int parse_cfe_partitions(struct mtd_info *master,
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struct mtd_partition **pparts)
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{
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/* CFE, NVRAM and global Linux are always present */
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int nrparts = 3, curpart = 0;
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struct bcm_tag *buf;
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struct mtd_partition *parts;
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int ret;
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size_t retlen;
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unsigned int rootfsaddr, kerneladdr, spareaddr;
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unsigned int rootfslen, kernellen, sparelen, totallen;
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int namelen = 0;
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int i;
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char *boardid;
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char *tagversion;
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/* Allocate memory for buffer */
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buf = vmalloc(sizeof(struct bcm_tag));
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if (!buf)
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return -ENOMEM;
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/* Get the tag */
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ret = master->read(master, master->erasesize, sizeof(struct bcm_tag),
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&retlen, (void *)buf);
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if (retlen != sizeof(struct bcm_tag)) {
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vfree(buf);
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return -EIO;
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}
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sscanf(buf->kernel_address, "%u", &kerneladdr);
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sscanf(buf->kernel_length, "%u", &kernellen);
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sscanf(buf->total_length, "%u", &totallen);
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tagversion = &(buf->tag_version[0]);
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boardid = &(buf->board_id[0]);
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printk(KERN_INFO PFX "CFE boot tag found with version %s "
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"and board type %s\n", tagversion, boardid);
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kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
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rootfsaddr = kerneladdr + kernellen;
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spareaddr = roundup(totallen, master->erasesize) + master->erasesize;
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sparelen = master->size - spareaddr - master->erasesize;
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rootfslen = spareaddr - rootfsaddr;
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/* Determine number of partitions */
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namelen = 8;
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if (rootfslen > 0) {
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nrparts++;
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namelen += 6;
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};
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if (kernellen > 0) {
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nrparts++;
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namelen += 6;
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};
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/* Ask kernel for more memory */
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parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
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if (!parts) {
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vfree(buf);
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return -ENOMEM;
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};
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/* Start building partition list */
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parts[curpart].name = "CFE";
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parts[curpart].offset = 0;
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parts[curpart].size = master->erasesize;
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curpart++;
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if (kernellen > 0) {
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parts[curpart].name = "kernel";
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parts[curpart].offset = kerneladdr;
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parts[curpart].size = kernellen;
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curpart++;
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};
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if (rootfslen > 0) {
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parts[curpart].name = "rootfs";
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parts[curpart].offset = rootfsaddr;
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parts[curpart].size = rootfslen;
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if (sparelen > 0)
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parts[curpart].size += sparelen;
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curpart++;
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};
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parts[curpart].name = "nvram";
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parts[curpart].offset = master->size - master->erasesize;
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parts[curpart].size = master->erasesize;
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/* Global partition "linux" to make easy firmware upgrade */
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curpart++;
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parts[curpart].name = "linux";
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parts[curpart].offset = parts[0].size;
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parts[curpart].size = master->size - parts[0].size - parts[3].size;
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for (i = 0; i < nrparts; i++)
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printk(KERN_INFO PFX "Partition %d is %s offset %lx and "
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"length %lx\n", i, parts[i].name,
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(long unsigned int)(parts[i].offset),
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(long unsigned int)(parts[i].size));
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printk(KERN_INFO PFX "Spare partition is %x offset and length %x\n",
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spareaddr, sparelen);
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*pparts = parts;
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vfree(buf);
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return nrparts;
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};
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static int bcm963xx_detect_cfe(struct mtd_info *master)
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{
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int idoffset = 0x4e0;
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static char idstring[8] = "CFE1CFE1";
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char buf[9];
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int ret;
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size_t retlen;
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ret = master->read(master, idoffset, 8, &retlen, (void *)buf);
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buf[retlen] = 0;
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printk(KERN_INFO PFX "Read Signature value of %s\n", buf);
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return strncmp(idstring, buf, 8);
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}
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static int bcm963xx_probe(struct platform_device *pdev)
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{
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int err = 0;
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int parsed_nr_parts = 0;
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char *part_type;
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struct resource *r;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r) {
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dev_err(&pdev->dev, "no resource supplied\n");
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return -ENODEV;
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}
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bcm963xx_map.phys = r->start;
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bcm963xx_map.size = resource_size(r);
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bcm963xx_map.virt = ioremap(r->start, resource_size(r));
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if (!bcm963xx_map.virt) {
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dev_err(&pdev->dev, "failed to ioremap\n");
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return -EIO;
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}
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dev_info(&pdev->dev, "0x%08lx at 0x%08x\n",
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bcm963xx_map.size, bcm963xx_map.phys);
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simple_map_init(&bcm963xx_map);
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bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map);
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if (!bcm963xx_mtd_info) {
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dev_err(&pdev->dev, "failed to probe using CFI\n");
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err = -EIO;
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goto err_probe;
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}
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bcm963xx_mtd_info->owner = THIS_MODULE;
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/* This is mutually exclusive */
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if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0) {
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dev_info(&pdev->dev, "CFE bootloader detected\n");
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if (parsed_nr_parts == 0) {
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int ret = parse_cfe_partitions(bcm963xx_mtd_info,
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&parsed_parts);
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if (ret > 0) {
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part_type = "CFE";
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parsed_nr_parts = ret;
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}
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}
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} else {
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dev_info(&pdev->dev, "unsupported bootloader\n");
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err = -ENODEV;
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goto err_probe;
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}
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return add_mtd_partitions(bcm963xx_mtd_info, parsed_parts,
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parsed_nr_parts);
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err_probe:
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iounmap(bcm963xx_map.virt);
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return err;
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}
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static int bcm963xx_remove(struct platform_device *pdev)
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{
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if (bcm963xx_mtd_info) {
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del_mtd_partitions(bcm963xx_mtd_info);
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map_destroy(bcm963xx_mtd_info);
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}
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if (bcm963xx_map.virt) {
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iounmap(bcm963xx_map.virt);
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bcm963xx_map.virt = 0;
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}
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return 0;
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}
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static struct platform_driver bcm63xx_mtd_dev = {
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.probe = bcm963xx_probe,
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.remove = bcm963xx_remove,
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.driver = {
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.name = "bcm963xx-flash",
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.owner = THIS_MODULE,
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},
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};
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static int __init bcm963xx_mtd_init(void)
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{
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return platform_driver_register(&bcm63xx_mtd_dev);
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}
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static void __exit bcm963xx_mtd_exit(void)
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{
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platform_driver_unregister(&bcm63xx_mtd_dev);
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}
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module_init(bcm963xx_mtd_init);
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module_exit(bcm963xx_mtd_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Broadcom BCM63xx MTD driver for CFE and RedBoot");
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MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
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MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");
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