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>

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 8c2fa80..6c55766 100644 (file)
--- 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];

diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 943550d..5c69315 100644 (file)
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -85,6 +85,7 @@ struct mmc_ext_csd {
        bool                    boot_ro_lockable;
        u8                      raw_exception_status;   /* 53 */
        u8                      raw_partition_support;  /* 160 */
+       u8                      raw_rpmb_size_mult;     /* 168 */
        u8                      raw_erased_mem_count;   /* 181 */
        u8                      raw_ext_csd_structure;  /* 194 */
        u8                      raw_card_type;          /* 196 */
@@ -206,6 +207,7 @@ struct mmc_part {
 #define MMC_BLK_DATA_AREA_MAIN (1<<0)
 #define MMC_BLK_DATA_AREA_BOOT (1<<1)
 #define MMC_BLK_DATA_AREA_GP   (1<<2)
+#define MMC_BLK_DATA_AREA_RPMB (1<<3)
 };
 
 /*

diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 01e4b39..94d532e 100644 (file)
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -286,6 +286,7 @@ struct _mmc_csd {
 #define EXT_CSD_BKOPS_START            164     /* W */
 #define EXT_CSD_SANITIZE_START         165     /* W */
 #define EXT_CSD_WR_REL_PARAM           166     /* RO */
+#define EXT_CSD_RPMB_MULT              168     /* RO */
 #define EXT_CSD_BOOT_WP                        173     /* R/W */
 #define EXT_CSD_ERASE_GROUP_DEF                175     /* R/W */
 #define EXT_CSD_PART_CONFIG            179     /* R/W */
@@ -339,6 +340,7 @@ struct _mmc_csd {
 
 #define EXT_CSD_PART_CONFIG_ACC_MASK   (0x7)
 #define EXT_CSD_PART_CONFIG_ACC_BOOT0  (0x1)
+#define EXT_CSD_PART_CONFIG_ACC_RPMB   (0x3)
 #define EXT_CSD_PART_CONFIG_ACC_GP0    (0x4)
 
 #define EXT_CSD_PART_SUPPORT_PART_EN   (0x1)