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mtd: partitions: Add OF support to RedBoot partitions 

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
View File

@ -25,7 +25,7 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/vmalloc.h> #include <linux/vmalloc.h>
#include <linux/of.h>
#include <linux/mtd/mtd.h> #include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h> #include <linux/mtd/partitions.h>
#include <linux/module.h> #include <linux/module.h>
@ -56,6 +56,27 @@ static inline int redboot_checksum(struct fis_image_desc *img)
return 1; 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, static int parse_redboot_partitions(struct mtd_info *master,
const struct mtd_partition **pparts, const struct mtd_partition **pparts,
struct mtd_part_parser_data *data) struct mtd_part_parser_data *data)
@ -76,6 +97,8 @@ static int parse_redboot_partitions(struct mtd_info *master,
static char nullstring[] = "unallocated"; static char nullstring[] = "unallocated";
#endif #endif
parse_redboot_of(master);
if ( directory < 0 ) { if ( directory < 0 ) {
offset = master->size + directory * master->erasesize; offset = master->size + directory * master->erasesize;
while (mtd_block_isbad(master, offset)) { while (mtd_block_isbad(master, offset)) {
@ -289,9 +312,16 @@ static int parse_redboot_partitions(struct mtd_info *master,
return ret; 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 = { static struct mtd_part_parser redboot_parser = {
.parse_fn = parse_redboot_partitions, .parse_fn = parse_redboot_partitions,
.name = "RedBoot", .name = "RedBoot",
.of_match_table = mtd_parser_redboot_of_match_table,
}; };
module_mtd_part_parser(redboot_parser); module_mtd_part_parser(redboot_parser);