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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>
This commit is contained in:
Loic Pallardy 2012-11-17 18:08:24 -05:00 committed by Chris Ball
parent ed9dbb6eff
commit 090d25fe22
3 changed files with 15 additions and 0 deletions
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11
drivers/mmc/core/mmc.c
View File

@ -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];

2
include/linux/mmc/card.h
View File

@ -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)
};
/*

2
include/linux/mmc/mmc.h
View File

@ -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)