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mtd: partitions: Add OF support to RedBoot partitions

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This adds device tree support for RedBoot partitioning. We
read out the FIS directory block information from the device
tree and then parse the partition table from there.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
This commit is contained in:
Linus Walleij 2018-11-10 22:14:13 +01:00 committed by Boris Brezillon
parent e0be6a68b5
commit c0e118c8a1
1 changed files with 31 additions and 1 deletions
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32
drivers/mtd/parsers/redboot.c
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@ -25,7 +25,7 @@
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/of.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/module.h>
@ -56,6 +56,27 @@ static inline int redboot_checksum(struct fis_image_desc *img)
return 1;
}
static void parse_redboot_of(struct mtd_info *master)
{
struct device_node *np;
u32 dirblock;
int ret;
np = mtd_get_of_node(master);
if (!np)
return;
ret = of_property_read_u32(np, "fis-index-block", &dirblock);
if (ret)
return;
/*
* Assign the block found in the device tree to the local
* directory block pointer.
*/
directory = dirblock;
}
static int parse_redboot_partitions(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
@ -76,6 +97,8 @@ static int parse_redboot_partitions(struct mtd_info *master,
static char nullstring[] = "unallocated";
#endif
parse_redboot_of(master);
if ( directory < 0 ) {
offset = master->size + directory * master->erasesize;
while (mtd_block_isbad(master, offset)) {
@ -289,9 +312,16 @@ static int parse_redboot_partitions(struct mtd_info *master,
return ret;
}
static const struct of_device_id mtd_parser_redboot_of_match_table[] = {
{ .compatible = "redboot-fis" },
{},
};
MODULE_DEVICE_TABLE(of, mtd_parser_redboot_of_match_table);
static struct mtd_part_parser redboot_parser = {
.parse_fn = parse_redboot_partitions,
.name = "RedBoot",
.of_match_table = mtd_parser_redboot_of_match_table,
};
module_mtd_part_parser(redboot_parser);