Currently, there is no way to find out the offset of an mtd partition by a driver. This might be needed by external hardware.
For example, a flash containing the firmware of an external device that is also accessible by the main cpu/kernel. The flash is big enough to have two partitions with 2 versions of the firmware, so we can have a safe upgrade. Once the flash has been updated we need the real offset, so we can write it on the external device registers. Signed-off-by: Ricardo Ribalda Delgado <[email protected]> --- drivers/mtd/mtdpart.c | 8 ++++++++ include/linux/mtd/partitions.h | 1 + 2 files changed, 9 insertions(+) diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index a3e3a7d..8047e74 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -784,3 +784,11 @@ uint64_t mtd_get_device_size(const struct mtd_info *mtd) return PART(mtd)->master->size; } EXPORT_SYMBOL_GPL(mtd_get_device_size); + +uint64_t mtd_get_device_offset(const struct mtd_info *mtd){ + if (!mtd_is_partition(mtd)) + return 0; + + return PART(mtd)->offset; +} +EXPORT_SYMBOL_GPL(mtd_get_device_offset); diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h index 6a35e6d..2b953b4 100644 --- a/include/linux/mtd/partitions.h +++ b/include/linux/mtd/partitions.h @@ -84,5 +84,6 @@ int mtd_add_partition(struct mtd_info *master, const char *name, long long offset, long long length); int mtd_del_partition(struct mtd_info *master, int partno); uint64_t mtd_get_device_size(const struct mtd_info *mtd); +uint64_t mtd_get_device_offset(const struct mtd_info *mtd); #endif -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
