mmc: read the size of eMMC enhanced user data area

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>

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 86c4db9f6f725ecff5588d651c37c72715cc729c..f07505f556401cfd6a07c2cc83999b0edbacb57c 100644 (file)
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -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

diff --git a/include/mmc.h b/include/mmc.h
index 69c60706df9c419e06f830b2a5e7d78b66919952..18155c9d6cd5774321ddc2cf3a209276407add0f 100644 (file)
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -147,6 +147,8 @@
 /*
  * EXT_CSD fields
  */
+#define EXT_CSD_ENH_START_ADDR         136     /* R/W */
+#define EXT_CSD_ENH_SIZE_MULT          140     /* R/W */
 #define EXT_CSD_GP_SIZE_MULT           143     /* R/W */
 #define EXT_CSD_PARTITION_SETTING      155     /* R/W */
 #define EXT_CSD_PARTITIONS_ATTRIBUTE   156     /* R/W */
@@ -319,6 +321,8 @@ struct mmc {
        u64 capacity_boot;
        u64 capacity_rpmb;
        u64 capacity_gp[4];
+       u64 enh_user_start;
+       u64 enh_user_size;
        block_dev_desc_t block_dev;
        char op_cond_pending;   /* 1 if we are waiting on an op_cond command */
        char init_in_progress;  /* 1 if we have done mmc_start_init() */