diff options
Diffstat (limited to 'drivers/mtd/parsers/parser_trx.c')
-rw-r--r-- | drivers/mtd/parsers/parser_trx.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/drivers/mtd/parsers/parser_trx.c b/drivers/mtd/parsers/parser_trx.c new file mode 100644 index 0000000000..4814cf218e --- /dev/null +++ b/drivers/mtd/parsers/parser_trx.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Parser for TRX format partitions + * + * Copyright (C) 2012 - 2017 Rafał Miłecki <rafal@milecki.pl> + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/partitions.h> + +#define TRX_PARSER_MAX_PARTS 4 + +/* Magics */ +#define TRX_MAGIC 0x30524448 +#define UBI_EC_MAGIC 0x23494255 /* UBI# */ + +struct trx_header { + uint32_t magic; + uint32_t length; + uint32_t crc32; + uint16_t flags; + uint16_t version; + uint32_t offset[3]; +} __packed; + +static const char *parser_trx_data_part_name(struct mtd_info *master, + size_t offset) +{ + uint32_t buf; + size_t bytes_read; + int err; + + err = mtd_read(master, offset, sizeof(buf), &bytes_read, + (uint8_t *)&buf); + if (err && !mtd_is_bitflip(err)) { + pr_err("mtd_read error while parsing (offset: 0x%zX): %d\n", + offset, err); + goto out_default; + } + + if (buf == UBI_EC_MAGIC) + return "ubi"; + +out_default: + return "rootfs"; +} + +static int parser_trx_parse(struct mtd_info *mtd, + const struct mtd_partition **pparts, + struct mtd_part_parser_data *data) +{ + struct device_node *np = mtd_get_of_node(mtd); + struct mtd_partition *parts; + struct mtd_partition *part; + struct trx_header trx; + size_t bytes_read; + uint8_t curr_part = 0, i = 0; + uint32_t trx_magic = TRX_MAGIC; + int err; + + /* Get different magic from device tree if specified */ + err = of_property_read_u32(np, "brcm,trx-magic", &trx_magic); + if (err != 0 && err != -EINVAL) + pr_err("failed to parse \"brcm,trx-magic\" DT attribute, using default: %d\n", err); + + parts = kcalloc(TRX_PARSER_MAX_PARTS, sizeof(struct mtd_partition), + GFP_KERNEL); + if (!parts) + return -ENOMEM; + + err = mtd_read(mtd, 0, sizeof(trx), &bytes_read, (uint8_t *)&trx); + if (err) { + pr_err("MTD reading error: %d\n", err); + kfree(parts); + return err; + } + + if (trx.magic != trx_magic) { + kfree(parts); + return -ENOENT; + } + + /* We have LZMA loader if there is address in offset[2] */ + if (trx.offset[2]) { + part = &parts[curr_part++]; + part->name = "loader"; + part->offset = trx.offset[i]; + i++; + } + + if (trx.offset[i]) { + part = &parts[curr_part++]; + part->name = "linux"; + part->offset = trx.offset[i]; + i++; + } + + if (trx.offset[i]) { + part = &parts[curr_part++]; + part->name = parser_trx_data_part_name(mtd, trx.offset[i]); + part->offset = trx.offset[i]; + i++; + } + + /* + * Assume that every partition ends at the beginning of the one it is + * followed by. + */ + for (i = 0; i < curr_part; i++) { + u64 next_part_offset = (i < curr_part - 1) ? + parts[i + 1].offset : mtd->size; + + parts[i].size = next_part_offset - parts[i].offset; + } + + *pparts = parts; + return i; +}; + +static const struct of_device_id mtd_parser_trx_of_match_table[] = { + { .compatible = "brcm,trx" }, + {}, +}; +MODULE_DEVICE_TABLE(of, mtd_parser_trx_of_match_table); + +static struct mtd_part_parser mtd_parser_trx = { + .parse_fn = parser_trx_parse, + .name = "trx", + .of_match_table = mtd_parser_trx_of_match_table, +}; +module_mtd_part_parser(mtd_parser_trx); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Parser for TRX format partitions"); |