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authorRafał Miłecki <rafal@milecki.pl>2017-01-10 15:12:04 +0100
committerRafał Miłecki <rafal@milecki.pl>2017-01-10 15:37:22 +0100
commit1a5cb4ac1bd0f1a7047e2a6825950654c44ca01f (patch)
treeeaab394a052a5a943f6a33b52a5c4d798f8779da /target/linux/generic/patches-4.4/141-0002-mtd-bcm47xxpart-support-layouts-with-multiple-TRX-pa.patch
parentef9208c51eff93c58de02691a87749fb184a2889 (diff)
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kernel: add pending bcm47xxpart support for failsafe TRX partition
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Diffstat (limited to 'target/linux/generic/patches-4.4/141-0002-mtd-bcm47xxpart-support-layouts-with-multiple-TRX-pa.patch')
-rw-r--r--target/linux/generic/patches-4.4/141-0002-mtd-bcm47xxpart-support-layouts-with-multiple-TRX-pa.patch108
1 files changed, 108 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/141-0002-mtd-bcm47xxpart-support-layouts-with-multiple-TRX-pa.patch b/target/linux/generic/patches-4.4/141-0002-mtd-bcm47xxpart-support-layouts-with-multiple-TRX-pa.patch
new file mode 100644
index 0000000000..1065322fd8
--- /dev/null
+++ b/target/linux/generic/patches-4.4/141-0002-mtd-bcm47xxpart-support-layouts-with-multiple-TRX-pa.patch
@@ -0,0 +1,108 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Subject: [PATCH 2/2] mtd: bcm47xxpart: support layouts with multiple TRX
+ partitions
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Some devices may have an extra TRX partition used as failsafe one. If
+we detect such partition we should set a proper name for it and don't
+parse it.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+---
+ drivers/mtd/bcm47xxpart.c | 56 ++++++++++++++++++++++++++++++++++++++---------
+ 1 file changed, 46 insertions(+), 10 deletions(-)
+
+--- a/drivers/mtd/bcm47xxpart.c
++++ b/drivers/mtd/bcm47xxpart.c
+@@ -9,6 +9,7 @@
+ *
+ */
+
++#include <linux/bcm47xx_nvram.h>
+ #include <linux/module.h>
+ #include <linux/kernel.h>
+ #include <linux/slab.h>
+@@ -147,6 +148,30 @@ static int bcm47xxpart_parse_trx(struct
+ return curr_part;
+ }
+
++/**
++ * bcm47xxpart_bootpartition - gets index of TRX partition used by bootloader
++ *
++ * Some devices may have more than one TRX partition. In such case one of them
++ * is the main one and another a failsafe one. Bootloader may fallback to the
++ * failsafe firmware if it detects corruption of the main image.
++ *
++ * This function provides info about currently used TRX partition. It's the one
++ * containing kernel started by the bootloader.
++ */
++static int bcm47xxpart_bootpartition(void)
++{
++ char buf[4];
++ int bootpartition;
++
++ /* Check CFE environment variable */
++ if (bcm47xx_nvram_getenv("bootpartition", buf, sizeof(buf)) > 0) {
++ if (!kstrtoint(buf, 0, &bootpartition))
++ return bootpartition;
++ }
++
++ return 0;
++}
++
+ static int bcm47xxpart_parse(struct mtd_info *master,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+@@ -157,7 +182,8 @@ static int bcm47xxpart_parse(struct mtd_
+ size_t bytes_read;
+ uint32_t offset;
+ uint32_t blocksize = master->erasesize;
+- int trx_part = -1;
++ int trx_parts[2]; /* Array with indexes of TRX partitions */
++ int trx_num = 0; /* Number of found TRX partitions */
+ int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
+ int err;
+
+@@ -246,7 +272,11 @@ static int bcm47xxpart_parse(struct mtd_
+ if (buf[0x000 / 4] == TRX_MAGIC) {
+ struct trx_header *trx;
+
+- trx_part = curr_part;
++ if (trx_num >= ARRAY_SIZE(trx_parts))
++ pr_warn("No enough space to store another TRX found at 0x%X\n",
++ offset);
++ else
++ trx_parts[trx_num++] = curr_part;
+ bcm47xxpart_add_part(&parts[curr_part++], "firmware",
+ offset, 0);
+
+@@ -332,14 +362,20 @@ static int bcm47xxpart_parse(struct mtd_
+ }
+
+ /* If there was TRX parse it now */
+- if (trx_part >= 0) {
+- int num_parts;
++ for (i = 0; i < trx_num; i++) {
++ struct mtd_partition *trx = &parts[trx_parts[i]];
+
+- num_parts = bcm47xxpart_parse_trx(master, &parts[trx_part],
+- parts + curr_part,
+- BCM47XXPART_MAX_PARTS - curr_part);
+- if (num_parts > 0)
+- curr_part += num_parts;
++ if (i == bcm47xxpart_bootpartition()) {
++ int num_parts;
++
++ num_parts = bcm47xxpart_parse_trx(master, trx,
++ parts + curr_part,
++ BCM47XXPART_MAX_PARTS - curr_part);
++ if (num_parts > 0)
++ curr_part += num_parts;
++ } else {
++ trx->name = "failsafe";
++ }
+ }
+
+ *pparts = parts;