320 lines
8.3 KiB
Diff
320 lines
8.3 KiB
Diff
From 99352afe8f169c95b294b6b9a8d0e18cd9e3c2a0 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Wed, 21 Jun 2017 08:26:47 +0200
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Subject: [PATCH] mtd: extract TRX parser out of bcm47xxpart into a separated
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module
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This makes TRX parsing code reusable with other platforms and parsers.
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Please note this patch doesn't really change anything in the existing
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code, just moves it. There is still some place for improvement (e.g.
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working on non-hacky method of checking rootfs format) but it's not
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really a subject of this change.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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---
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drivers/mtd/Kconfig | 4 ++
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drivers/mtd/Makefile | 1 +
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drivers/mtd/bcm47xxpart.c | 99 ++----------------------------
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drivers/mtd/parsers/Kconfig | 8 +++
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drivers/mtd/parsers/Makefile | 1 +
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drivers/mtd/parsers/parser_trx.c | 126 +++++++++++++++++++++++++++++++++++++++
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6 files changed, 145 insertions(+), 94 deletions(-)
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create mode 100644 drivers/mtd/parsers/Kconfig
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create mode 100644 drivers/mtd/parsers/Makefile
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create mode 100644 drivers/mtd/parsers/parser_trx.c
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--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -155,6 +155,10 @@ config MTD_BCM47XX_PARTS
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This provides partitions parser for devices based on BCM47xx
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boards.
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+menu "Partition parsers"
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+source "drivers/mtd/parsers/Kconfig"
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+endmenu
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+
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comment "User Modules And Translation Layers"
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#
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--- a/drivers/mtd/Makefile
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+++ b/drivers/mtd/Makefile
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@@ -13,6 +13,7 @@ obj-$(CONFIG_MTD_AFS_PARTS) += afs.o
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obj-$(CONFIG_MTD_AR7_PARTS) += ar7part.o
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obj-$(CONFIG_MTD_BCM63XX_PARTS) += bcm63xxpart.o
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obj-$(CONFIG_MTD_BCM47XX_PARTS) += bcm47xxpart.o
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+obj-y += parsers/
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# 'Users' - code which presents functionality to userspace.
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obj-$(CONFIG_MTD_BLKDEVS) += mtd_blkdevs.o
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--- a/drivers/mtd/bcm47xxpart.c
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+++ b/drivers/mtd/bcm47xxpart.c
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@@ -43,7 +43,8 @@
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#define ML_MAGIC2 0x26594131
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#define TRX_MAGIC 0x30524448
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#define SHSQ_MAGIC 0x71736873 /* shsq (weird ZTE H218N endianness) */
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-#define UBI_EC_MAGIC 0x23494255 /* UBI# */
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+
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+static const char * const trx_types[] = { "trx", NULL };
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struct trx_header {
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uint32_t magic;
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@@ -62,89 +63,6 @@ static void bcm47xxpart_add_part(struct
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part->mask_flags = mask_flags;
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}
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-static const char *bcm47xxpart_trx_data_part_name(struct mtd_info *master,
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- size_t offset)
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-{
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- uint32_t buf;
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- size_t bytes_read;
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- int err;
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-
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- err = mtd_read(master, offset, sizeof(buf), &bytes_read,
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- (uint8_t *)&buf);
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- if (err && !mtd_is_bitflip(err)) {
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- pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
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- offset, err);
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- goto out_default;
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- }
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-
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- if (buf == UBI_EC_MAGIC)
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- return "ubi";
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-
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-out_default:
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- return "rootfs";
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-}
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-
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-static int bcm47xxpart_parse_trx(struct mtd_info *master,
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- struct mtd_partition *trx,
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- struct mtd_partition *parts,
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- size_t parts_len)
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-{
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- struct trx_header header;
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- size_t bytes_read;
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- int curr_part = 0;
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- int i, err;
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-
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- if (parts_len < 3) {
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- pr_warn("No enough space to add TRX partitions!\n");
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- return -ENOMEM;
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- }
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-
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- err = mtd_read(master, trx->offset, sizeof(header), &bytes_read,
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- (uint8_t *)&header);
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- if (err && !mtd_is_bitflip(err)) {
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- pr_err("mtd_read error while reading TRX header: %d\n", err);
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- return err;
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- }
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-
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- i = 0;
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-
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- /* We have LZMA loader if offset[2] points to sth */
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- if (header.offset[2]) {
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- bcm47xxpart_add_part(&parts[curr_part++], "loader",
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- trx->offset + header.offset[i], 0);
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- i++;
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- }
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-
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- if (header.offset[i]) {
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- bcm47xxpart_add_part(&parts[curr_part++], "linux",
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- trx->offset + header.offset[i], 0);
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- i++;
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- }
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-
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- if (header.offset[i]) {
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- size_t offset = trx->offset + header.offset[i];
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- const char *name = bcm47xxpart_trx_data_part_name(master,
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- offset);
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-
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- bcm47xxpart_add_part(&parts[curr_part++], name, offset, 0);
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- i++;
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- }
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-
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- /*
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- * Assume that every partition ends at the beginning of the one it is
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- * followed by.
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- */
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- for (i = 0; i < curr_part; i++) {
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- u64 next_part_offset = (i < curr_part - 1) ?
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- parts[i + 1].offset :
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- trx->offset + trx->size;
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-
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- parts[i].size = next_part_offset - parts[i].offset;
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- }
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-
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- return curr_part;
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-}
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-
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/**
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* bcm47xxpart_bootpartition - gets index of TRX partition used by bootloader
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*
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@@ -362,17 +280,10 @@ static int bcm47xxpart_parse(struct mtd_
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for (i = 0; i < trx_num; i++) {
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struct mtd_partition *trx = &parts[trx_parts[i]];
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- if (i == bcm47xxpart_bootpartition()) {
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- int num_parts;
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-
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- num_parts = bcm47xxpart_parse_trx(master, trx,
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- parts + curr_part,
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- BCM47XXPART_MAX_PARTS - curr_part);
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- if (num_parts > 0)
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- curr_part += num_parts;
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- } else {
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+ if (i == bcm47xxpart_bootpartition())
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+ trx->types = trx_types;
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+ else
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trx->name = "failsafe";
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- }
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}
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*pparts = parts;
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--- /dev/null
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+++ b/drivers/mtd/parsers/Kconfig
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@@ -0,0 +1,8 @@
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+config MTD_PARSER_TRX
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+ tristate "Parser for TRX format partitions"
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+ depends on MTD && (BCM47XX || ARCH_BCM_5301X || COMPILE_TEST)
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+ help
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+ TRX is a firmware format used by Broadcom on their devices. It
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+ may contain up to 3/4 partitions (depending on the version).
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+ This driver will parse TRX header and report at least two partitions:
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+ kernel and rootfs.
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--- /dev/null
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+++ b/drivers/mtd/parsers/Makefile
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@@ -0,0 +1 @@
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+obj-$(CONFIG_MTD_PARSER_TRX) += parser_trx.o
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--- /dev/null
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+++ b/drivers/mtd/parsers/parser_trx.c
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@@ -0,0 +1,126 @@
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+/*
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+ * Parser for TRX format partitions
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+ *
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+ * Copyright (C) 2012 - 2017 Rafał Miłecki <rafal@milecki.pl>
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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 version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/slab.h>
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+#include <linux/mtd/mtd.h>
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+#include <linux/mtd/partitions.h>
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+
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+#define TRX_PARSER_MAX_PARTS 4
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+
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+/* Magics */
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+#define TRX_MAGIC 0x30524448
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+#define UBI_EC_MAGIC 0x23494255 /* UBI# */
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+
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+struct trx_header {
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+ uint32_t magic;
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+ uint32_t length;
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+ uint32_t crc32;
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+ uint16_t flags;
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+ uint16_t version;
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+ uint32_t offset[3];
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+} __packed;
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+
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+static const char *parser_trx_data_part_name(struct mtd_info *master,
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+ size_t offset)
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+{
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+ uint32_t buf;
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+ size_t bytes_read;
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+ int err;
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+
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+ err = mtd_read(master, offset, sizeof(buf), &bytes_read,
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+ (uint8_t *)&buf);
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+ if (err && !mtd_is_bitflip(err)) {
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+ pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
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+ offset, err);
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+ goto out_default;
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+ }
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+
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+ if (buf == UBI_EC_MAGIC)
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+ return "ubi";
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+
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+out_default:
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+ return "rootfs";
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+}
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+
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+static int parser_trx_parse(struct mtd_info *mtd,
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+ const struct mtd_partition **pparts,
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+ struct mtd_part_parser_data *data)
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+{
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+ struct mtd_partition *parts;
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+ struct mtd_partition *part;
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+ struct trx_header trx;
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+ size_t bytes_read;
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+ uint8_t curr_part = 0, i = 0;
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+ int err;
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+
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+ parts = kzalloc(sizeof(struct mtd_partition) * TRX_PARSER_MAX_PARTS,
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+ GFP_KERNEL);
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+ if (!parts)
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+ return -ENOMEM;
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+
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+ err = mtd_read(mtd, 0, sizeof(trx), &bytes_read, (uint8_t *)&trx);
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+ if (err) {
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+ pr_err("MTD reading error: %d\n", err);
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+ kfree(parts);
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+ return err;
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+ }
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+
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+ if (trx.magic != TRX_MAGIC) {
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+ kfree(parts);
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+ return -ENOENT;
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+ }
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+
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+ /* We have LZMA loader if there is address in offset[2] */
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+ if (trx.offset[2]) {
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+ part = &parts[curr_part++];
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+ part->name = "loader";
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+ part->offset = trx.offset[i];
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+ i++;
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+ }
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+
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+ if (trx.offset[i]) {
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+ part = &parts[curr_part++];
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+ part->name = "linux";
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+ part->offset = trx.offset[i];
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+ i++;
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+ }
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+
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+ if (trx.offset[i]) {
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+ part = &parts[curr_part++];
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+ part->name = parser_trx_data_part_name(mtd, trx.offset[i]);
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+ part->offset = trx.offset[i];
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+ i++;
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+ }
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+
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+ /*
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+ * Assume that every partition ends at the beginning of the one it is
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+ * followed by.
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+ */
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+ for (i = 0; i < curr_part; i++) {
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+ u64 next_part_offset = (i < curr_part - 1) ?
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+ parts[i + 1].offset : mtd->size;
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+
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+ parts[i].size = next_part_offset - parts[i].offset;
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+ }
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+
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+ *pparts = parts;
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+ return i;
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+};
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+
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+static struct mtd_part_parser mtd_parser_trx = {
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+ .parse_fn = parser_trx_parse,
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+ .name = "trx",
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+};
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+module_mtd_part_parser(mtd_parser_trx);
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+
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+MODULE_LICENSE("GPL v2");
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+MODULE_DESCRIPTION("Parser for TRX format partitions");
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