Following JEDEC standard, if the mmc support RPMB partition,
a new interface is created and exposed via /dev/block.
Users will be able to access RPMB partition using standard
mmc IOCTL command.
Signed-off-by: Alex Macro <alex.macro@xxxxxxxxxxxxxx>
Signed-off-by: Loic Pallardy <loic.pallardy@xxxxxxxxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Acked-by: Johan Rudholm <johan.rudholm@xxxxxxxxxxxxxx>
Reviewed-by: Namjae Jeon <linkinjeon@xxxxxxxxx>
---
drivers/mmc/core/mmc.c | 11 +++++++++++
include/linux/mmc/card.h | 2 ++
include/linux/mmc/mmc.h | 2 ++
3 files changed, 15 insertions(+)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 258b203..8a459cb 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -480,6 +480,17 @@ 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 d76513b..46a5502 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -81,6 +81,7 @@ struct mmc_ext_csd {
unsigned int boot_ro_lock; /* ro lock support */
bool boot_ro_lockable;
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 */
@@ -200,6 +201,7 @@ 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 d425cab..e73136a 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -282,6 +282,7 @@ struct _mmc_csd {
#define EXT_CSD_RST_N_FUNCTION 162 /* R/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 */
@@ -333,6 +334,7 @@ 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)
--
1.7.11.1
--
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