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authorDiego Santa Cruz <Diego.SantaCruz@spinetix.com>2014-12-23 10:50:31 +0100
committerPantelis Antoniou <pantelis.antoniou@konsulko.com>2015-01-19 17:41:51 +0200
commit8dda5b0e60b84f2679bd51ae4bcdbe527fa438d4 (patch)
tree38e82ba899440bac1c981dbbea166146eeb7c586 /drivers/mmc
parentc599f53b5797ca2a07426002ef9ff64b8f52e5ae (diff)
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mmc: extend the mmc hardware partitioning API with write reliability
The eMMC partition write reliability settings are to be set while partitioning a device, as per the eMMC spec, so changes to these attributes needs to be done in the hardware partitioning API. This commit adds such support. Signed-off-by: Diego Santa Cruz <Diego.SantaCruz@spinetix.com>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/mmc.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 2a42e50..6fa5435 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -615,6 +615,7 @@ int mmc_hwpart_config(struct mmc *mmc,
u32 gp_size_mult[4];
u32 max_enh_size_mult;
u32 tot_enh_size_mult = 0;
+ u8 wr_rel_set;
int i, pidx, err;
ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN);
@@ -689,6 +690,33 @@ int mmc_hwpart_config(struct mmc *mmc,
return -EMEDIUMTYPE;
}
+ /* The default value of EXT_CSD_WR_REL_SET is device
+ * dependent, the values can only be changed if the
+ * EXT_CSD_HS_CTRL_REL bit is set. The values can be
+ * changed only once and before partitioning is completed. */
+ wr_rel_set = ext_csd[EXT_CSD_WR_REL_SET];
+ if (conf->user.wr_rel_change) {
+ if (conf->user.wr_rel_set)
+ wr_rel_set |= EXT_CSD_WR_DATA_REL_USR;
+ else
+ wr_rel_set &= ~EXT_CSD_WR_DATA_REL_USR;
+ }
+ for (pidx = 0; pidx < 4; pidx++) {
+ if (conf->gp_part[pidx].wr_rel_change) {
+ if (conf->gp_part[pidx].wr_rel_set)
+ wr_rel_set |= EXT_CSD_WR_DATA_REL_GP(pidx);
+ else
+ wr_rel_set &= ~EXT_CSD_WR_DATA_REL_GP(pidx);
+ }
+ }
+
+ if (wr_rel_set != ext_csd[EXT_CSD_WR_REL_SET] &&
+ !(ext_csd[EXT_CSD_WR_REL_PARAM] & EXT_CSD_HS_CTRL_REL)) {
+ puts("Card does not support host controlled partition write "
+ "reliability settings\n");
+ return -EMEDIUMTYPE;
+ }
+
if (ext_csd[EXT_CSD_PARTITION_SETTING] &
EXT_CSD_PARTITION_SETTING_COMPLETED) {
printf("Card already partitioned\n");
@@ -746,6 +774,17 @@ int mmc_hwpart_config(struct mmc *mmc,
if (mode == MMC_HWPART_CONF_SET)
return 0;
+ /* The WR_REL_SET is a write-once register but shall be
+ * written before setting PART_SETTING_COMPLETED. As it is
+ * write-once we can only write it when completing the
+ * partitioning. */
+ if (wr_rel_set != ext_csd[EXT_CSD_WR_REL_SET]) {
+ err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_WR_REL_SET, wr_rel_set);
+ if (err)
+ return err;
+ }
+
/* Setting PART_SETTING_COMPLETED confirms the partition
* configuration but it only becomes effective after power
* cycle, so we do not adjust the partition related settings