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180 lines
5.0 KiB
180 lines
5.0 KiB
From b522d7b0ebe3539340c2a6d46d787ae3d33bcb92 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: Tue, 10 Jan 2017 23:15:24 +0100
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Subject: [PATCH] mtd: bcm47xxpart: move TRX parsing code to separated function
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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 change simplifies main parsing loop logic a bit. In future it may
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be useful for moving TRX support to separated module / parser (if we
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implement support for them at some point).
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Finally parsing TRX at the end puts us in a better position as we have
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better flash layout knowledge. It may be useful e.g. if it appears there
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is more than 1 TRX partition.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Acked-by: Marek Vasut <marek.vasut@gmail.com>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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---
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drivers/mtd/bcm47xxpart.c | 121 ++++++++++++++++++++++++++++------------------
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1 file changed, 74 insertions(+), 47 deletions(-)
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--- a/drivers/mtd/bcm47xxpart.c
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+++ b/drivers/mtd/bcm47xxpart.c
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@@ -83,6 +83,67 @@ out_default:
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return "rootfs";
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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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static int bcm47xxpart_parse(struct mtd_info *master,
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struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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@@ -93,9 +154,7 @@ static int bcm47xxpart_parse(struct mtd_
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size_t bytes_read;
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uint32_t offset;
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uint32_t blocksize = master->erasesize;
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- struct trx_header *trx;
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int trx_part = -1;
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- int last_trx_part = -1;
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int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
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int err;
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@@ -182,54 +241,14 @@ static int bcm47xxpart_parse(struct mtd_
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/* TRX */
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if (buf[0x000 / 4] == TRX_MAGIC) {
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- if (BCM47XXPART_MAX_PARTS - curr_part < 4) {
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- pr_warn("Not enough partitions left to register trx, scanning stopped!\n");
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- break;
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- }
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-
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- trx = (struct trx_header *)buf;
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+ struct trx_header *trx;
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trx_part = curr_part;
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bcm47xxpart_add_part(&parts[curr_part++], "firmware",
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offset, 0);
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- i = 0;
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- /* We have LZMA loader if offset[2] points to sth */
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- if (trx->offset[2]) {
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- bcm47xxpart_add_part(&parts[curr_part++],
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- "loader",
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- offset + trx->offset[i],
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- 0);
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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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- bcm47xxpart_add_part(&parts[curr_part++],
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- "linux",
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- offset + trx->offset[i],
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- 0);
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- i++;
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- }
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-
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- /*
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- * Pure rootfs size is known and can be calculated as:
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- * trx->length - trx->offset[i]. We don't fill it as
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- * we want to have jffs2 (overlay) in the same mtd.
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- */
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- if (trx->offset[i]) {
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- const char *name;
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-
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- name = bcm47xxpart_trx_data_part_name(master, offset + trx->offset[i]);
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- bcm47xxpart_add_part(&parts[curr_part++],
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- name,
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- offset + trx->offset[i],
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- 0);
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- i++;
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- }
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-
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- last_trx_part = curr_part - 1;
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-
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/* Jump to the end of TRX */
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+ trx = (struct trx_header *)buf;
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offset = roundup(offset + trx->length, blocksize);
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/* Next loop iteration will increase the offset */
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offset -= blocksize;
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@@ -307,9 +326,17 @@ static int bcm47xxpart_parse(struct mtd_
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parts[i + 1].offset : master->size;
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parts[i].size = next_part_offset - parts[i].offset;
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- if (i == last_trx_part && trx_part >= 0)
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- parts[trx_part].size = next_part_offset -
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- parts[trx_part].offset;
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+ }
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+
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+ /* If there was TRX parse it now */
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+ if (trx_part >= 0) {
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+ int num_parts;
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+
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+ num_parts = bcm47xxpart_parse_trx(master, &parts[trx_part],
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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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}
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*pparts = parts;
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