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mtd: bcm47xxpart: support layouts with multiple TRX partitions

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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>
This commit is contained in:
Rafał Miłecki 2017-01-10 23:15:25 +01:00 committed by Brian Norris
parent b522d7b0eb
commit 89a0d9a9f1
1 changed files with 45 additions and 9 deletions
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54
drivers/mtd/bcm47xxpart.c
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@ -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;
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;