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mmc: read the size of eMMC enhanced user data area

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This modification reads the size of the eMMC enhanced user data area
upon initialization of an mmc device, it will be used later by
mmcinfo.

Signed-off-by: Diego Santa Cruz <Diego.SantaCruz@spinetix.com>
This commit is contained in:
Diego Santa Cruz
2014-12-23 10:50:22 +01:00
committed by Pantelis Antoniou
parent f8e89d6716
commit a7f852b688
2 changed files with 19 additions and 0 deletions
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15
drivers/mmc/mmc.c
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@@ -1031,6 +1031,21 @@ static int mmc_startup(struct mmc *mmc)
has_parts = true;
}
mmc->enh_user_size =
(ext_csd[EXT_CSD_ENH_SIZE_MULT+2] << 16) +
(ext_csd[EXT_CSD_ENH_SIZE_MULT+1] << 8) +
ext_csd[EXT_CSD_ENH_SIZE_MULT];
mmc->enh_user_size *= ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
mmc->enh_user_size *= ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
mmc->enh_user_size <<= 19;
mmc->enh_user_start =
(ext_csd[EXT_CSD_ENH_START_ADDR+3] << 24) +
(ext_csd[EXT_CSD_ENH_START_ADDR+2] << 16) +
(ext_csd[EXT_CSD_ENH_START_ADDR+1] << 8) +
ext_csd[EXT_CSD_ENH_START_ADDR];
if (mmc->high_capacity)
mmc->enh_user_start <<= 9;
/*
* Host needs to enable ERASE_GRP_DEF bit if device is
* partitioned. This bit will be lost every time after a reset