mmc: core: Expose access to RPMB partition

Following JEDEC standard, if the mmc supports RPMB partition,
a new interface is created and exposed via /dev/block.
Users will be able to access RPMB partition using standard
mmc IOCTL commands.

Signed-off-by: Alex Macro <alex.macro@stericsson.com>
Signed-off-by: Loic Pallardy <loic.pallardy@stericsson.com>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Johan Rudholm <johan.rudholm@stericsson.com>
Acked-by: Krishna Konda <kkonda@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 8c2fa8002abb..6c5576628ef1 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -491,6 +491,17 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 
                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
+
+                /*
+                 * RPMB regions are defined in multiples of 128K.
+                 */
+                card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
+                if (ext_csd[EXT_CSD_RPMB_MULT]) {
+                        mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
+                                EXT_CSD_PART_CONFIG_ACC_RPMB,
+                                "rpmb", 0, false,
+                                MMC_BLK_DATA_AREA_RPMB);
+                }
         }
 
         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];