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>

1 files changed, 97 insertions, 0 deletions

diff --git a/arch/mips/include/asm/mach-bcm63xx/bcm963xx_tag.h b/arch/mips/include/asm/mach-bcm63xx/bcm963xx_tag.h
new file mode 100644
index 000000000000..5325084d5c48
--- /dev/null
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm963xx_tag.h
@@ -0,0 +1,97 @@
+#ifndef __BCM963XX_TAG_H
+#define __BCM963XX_TAG_H
+
+#define TAGVER_LEN              4       /* Length of Tag Version */
+#define TAGLAYOUT_LEN           4       /* Length of FlashLayoutVer */
+#define SIG1_LEN                20      /* Company Signature 1 Length */
+#define SIG2_LEN                14      /* Company Signature 2 Lenght */
+#define BOARDID_LEN             16      /* Length of BoardId */
+#define ENDIANFLAG_LEN          2       /* Endian Flag Length */
+#define CHIPID_LEN              6       /* Chip Id Length */
+#define IMAGE_LEN               10      /* Length of Length Field */
+#define ADDRESS_LEN             12      /* Length of Address field */
+#define DUALFLAG_LEN            2       /* Dual Image flag Length */
+#define INACTIVEFLAG_LEN        2       /* Inactie Flag Length */
+#define RSASIG_LEN              20      /* Length of RSA Signature in tag */
+#define TAGINFO1_LEN            30      /* Length of vendor information field1 in tag */
+#define FLASHLAYOUTVER_LEN      4       /* Length of Flash Layout Version String tag */
+#define TAGINFO2_LEN            16      /* Length of vendor information field2 in tag */
+#define CRC_LEN                 4       /* Length of CRC in bytes */
+#define ALTTAGINFO_LEN          54      /* Alternate length for vendor information; Pirelli */
+
+#define NUM_PIRELLI             2
+#define IMAGETAG_CRC_START      0xFFFFFFFF
+
+#define PIRELLI_BOARDS { \
+        "AGPF-S0", \
+        "DWV-S0", \
+}
+
+/*
+ * The broadcom firmware assumes the rootfs starts the image,
+ * therefore uses the rootfs start (flash_image_address)
+ * to determine where to flash the image.  Since we have the kernel first
+ * we have to give it the kernel address, but the crc uses the length
+ * associated with this address (root_length), which is added to the kernel
+ * length (kernel_length) to determine the length of image to flash and thus
+ * needs to be rootfs + deadcode (jffs2 EOF marker)
+*/
+
+struct bcm_tag {
+        /* 0-3: Version of the image tag */
+        char tag_version[TAGVER_LEN];
+        /* 4-23: Company Line 1 */
+        char sig_1[SIG1_LEN];
+        /*  24-37: Company Line 2 */
+        char sig_2[SIG2_LEN];
+        /* 38-43: Chip this image is for */
+        char chip_id[CHIPID_LEN];
+        /* 44-59: Board name */
+        char board_id[BOARDID_LEN];
+        /* 60-61: Map endianness -- 1 BE 0 LE */
+        char big_endian[ENDIANFLAG_LEN];
+        /* 62-71: Total length of image */
+        char total_length[IMAGE_LEN];
+        /* 72-83: Address in memory of CFE */
+        char cfe__address[ADDRESS_LEN];
+        /* 84-93: Size of CFE */
+        char cfe_length[IMAGE_LEN];
+        /* 94-105: Address in memory of image start
+         * (kernel for OpenWRT, rootfs for stock firmware)
+         */
+        char flash_image_start[ADDRESS_LEN];
+        /* 106-115: Size of rootfs */
+        char root_length[IMAGE_LEN];
+        /* 116-127: Address in memory of kernel */
+        char kernel_address[ADDRESS_LEN];
+        /* 128-137: Size of kernel */
+        char kernel_length[IMAGE_LEN];
+        /* 138-139: Unused at the moment */
+        char dual_image[DUALFLAG_LEN];
+        /* 140-141: Unused at the moment */
+        char inactive_flag[INACTIVEFLAG_LEN];
+        /* 142-161: RSA Signature (not used; some vendors may use this) */
+        char rsa_signature[RSASIG_LEN];
+        /* 162-191: Compilation and related information (not used in OpenWrt) */
+        char information1[TAGINFO1_LEN];
+        /* 192-195: Version flash layout */
+        char flash_layout_ver[FLASHLAYOUTVER_LEN];
+        /* 196-199: kernel+rootfs CRC32 */
+        char fskernel_crc[CRC_LEN];
+        /* 200-215: Unused except on Alice Gate where is is information */
+        char information2[TAGINFO2_LEN];
+        /* 216-219: CRC32 of image less imagetag (kernel for Alice Gate) */
+        char image_crc[CRC_LEN];
+        /* 220-223: CRC32 of rootfs partition */
+        char rootfs_crc[CRC_LEN];
+        /* 224-227: CRC32 of kernel partition */
+        char kernel_crc[CRC_LEN];
+        /* 228-235: Unused at present */
+        char reserved1[8];
+        /* 236-239: CRC32 of header excluding tagVersion */
+        char header_crc[CRC_LEN];
+        /* 240-255: Unused at present */
+        char reserved2[16];
+};
+
+#endif /* __BCM63XX_TAG_H */