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authorRafał Miłecki <rafal@milecki.pl>2017-01-10 23:15:25 +0100
committerBrian Norris <computersforpeace@gmail.com>2017-02-09 18:59:45 -0800
commit89a0d9a9f1941a086a82bc7cd73d275cec98ba14 (patch)
treedcf4a2f741354b43eeb6b1050f68a2881a1e8347 /drivers/mtd
parentb522d7b0ebe3539340c2a6d46d787ae3d33bcb92 (diff)
downloadlinux-89a0d9a9f1941a086a82bc7cd73d275cec98ba14.tar.bz2
mtd: bcm47xxpart: support layouts with multiple TRX partitions
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> Acked-by: Marek Vasut <marek.vasut@gmail.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/bcm47xxpart.c56
1 files changed, 46 insertions, 10 deletions
diff --git a/drivers/mtd/bcm47xxpart.c b/drivers/mtd/bcm47xxpart.c
index 10930257c14c..d10fa6c8f074 100644
--- 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>
@@ -144,6 +145,30 @@ static int bcm47xxpart_parse_trx(struct mtd_info *master,
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,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
@@ -154,7 +179,8 @@ static int bcm47xxpart_parse(struct mtd_info *master,
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;
@@ -243,7 +269,11 @@ static int bcm47xxpart_parse(struct mtd_info *master,
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);
@@ -329,14 +359,20 @@ static int bcm47xxpart_parse(struct mtd_info *master,
}
/* If there was TRX parse it now */
- if (trx_part >= 0) {
- int num_parts;
-
- 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;
+ for (i = 0; i < trx_num; i++) {
+ struct mtd_partition *trx = &parts[trx_parts[i]];
+
+ 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;