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Commit 7da84c30 authored by Krishna Konda's avatar Krishna Konda
Browse files

mmc: core: expose info about enhanced rpmb support 



Following eMMC JEDEC JESD84-B51 standard, an ehannced form of
rpmb is supported. What this enhanced mode supports is in
addition to be able to write one rpmb or two rpmb frames at a
time, 32 frames can be written at a time.

Expose this information present in ext csd field so that the
user space application that wants to make use of this can do
so.

Change-Id: I53fd962fd7e04b5d2d7804c289d7865c2c5618d5
Signed-off-by: default avatarKrishna Konda <kkonda@codeaurora.org>
parent 37bc52a5

drivers/mmc/core/mmc.c

+6 −0
Original line number Diff line number Diff line
@@ -677,6 +677,9 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) 
				mmc_hostname(card->host),

				card->ext_csd.barrier_support,

				card->ext_csd.cache_flush_policy);

		card->ext_csd.enhanced_rpmb_supported =

			(card->ext_csd.rel_param &

			 EXT_CSD_WR_REL_PARAM_EN_RPMB_REL_WR);

	} else {

		card->ext_csd.cmdq_support = 0;

		card->ext_csd.cmdq_depth = 0;
@@ -789,6 +792,8 @@ MMC_DEV_ATTR(enhanced_area_offset, "%llu\n", 
		card->ext_csd.enhanced_area_offset);

MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);

MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);

MMC_DEV_ATTR(enhanced_rpmb_supported, "%#x\n",

		card->ext_csd.enhanced_rpmb_supported);

MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);



static struct attribute *mmc_std_attrs[] = {
@@ -807,6 +812,7 @@ static struct attribute *mmc_std_attrs[] = { 
	&dev_attr_enhanced_area_offset.attr,

	&dev_attr_enhanced_area_size.attr,

	&dev_attr_raw_rpmb_size_mult.attr,

	&dev_attr_enhanced_rpmb_supported.attr,

	&dev_attr_rel_sectors.attr,

	NULL,

};

include/linux/mmc/card.h

+1 −0
Original line number Diff line number Diff line
@@ -56,6 +56,7 @@ struct mmc_ext_csd { 
	u8			sec_feature_support;

	u8			rel_sectors;

	u8			rel_param;

	bool			enhanced_rpmb_supported;

	u8			part_config;

	u8			cache_ctrl;

	u8			rst_n_function;

include/linux/mmc/mmc.h

+2 −1
Original line number Diff line number Diff line
@@ -298,6 +298,7 @@ struct _mmc_csd { 
 */



#define EXT_CSD_WR_REL_PARAM_EN			(1<<2)

#define EXT_CSD_WR_REL_PARAM_EN_RPMB_REL_WR	(1<<4)



#define EXT_CSD_BOOT_WP_B_PWR_WP_DIS	(0x40)

#define EXT_CSD_BOOT_WP_B_PERM_WP_DIS	(0x10)