diff options
| author | Pali Rohár <pali@kernel.org> | 2023-04-13 22:57:48 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2023-05-03 08:39:23 +0200 |
| commit | 461fa17970de418a93832f734a595031c0b72128 (patch) | |
| tree | c649d7508d3114b8ef4afd34542c953e245179c2 | |
| parent | 4ee99d9ff98ba9b57b65fb895504f767dfe14d82 (diff) | |
| download | u-boot-CHECK/eMMC-partconf-check.zip u-boot-CHECK/eMMC-partconf-check.tar.gz u-boot-CHECK/eMMC-partconf-check.tar.bz2 | |
mmc: Read eMMC partition access bits before card resetCHECK/eMMC-partconf-check
eMMC specification in section "Access partitions" says that all reset
events will restore the access bits in PARTITION_CONFIG CSD register to
default User Data Area value (0b000).
So read partition access bits from PARTITION_CONFIG CSD register before
issuing card reset. This allows SPL/U-Boot to get information which eMMC
partition was in use before SPL/U-Boot was booted. For some platforms this
is the way how to determinate boot partition from which BootROM loaded SPL.
Signed-off-by: Pali Rohár <pali@kernel.org>
| -rw-r--r-- | drivers/mmc/mmc.c | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 1af6af8..9915610 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -2329,8 +2329,17 @@ static int mmc_startup_v4(struct mmc *mmc) /* store the partition info of emmc */ mmc->part_support = ext_csd[EXT_CSD_PARTITIONING_SUPPORT]; if ((ext_csd[EXT_CSD_PARTITIONING_SUPPORT] & PART_SUPPORT) || - ext_csd[EXT_CSD_BOOT_MULT]) - mmc->part_config = ext_csd[EXT_CSD_PART_CONF]; + ext_csd[EXT_CSD_BOOT_MULT]) { + /* + * At this stage PART_ACCESS_MASK bits in ext_csd[] are already cleared. + * But it is possible that they were already filled into mmc->part_config. + */ + if (mmc->part_config == MMCPART_NOAVAILABLE) + mmc->part_config = ext_csd[EXT_CSD_PART_CONF]; + else + mmc->part_config = (ext_csd[EXT_CSD_PART_CONF] & ~PART_ACCESS_MASK) | + (mmc->part_config & PART_ACCESS_MASK); + } if (part_completed && (ext_csd[EXT_CSD_PARTITIONING_SUPPORT] & ENHNCD_SUPPORT)) mmc->part_attr = ext_csd[EXT_CSD_PARTITIONS_ATTRIBUTE]; @@ -2603,7 +2612,6 @@ static int mmc_startup(struct mmc *mmc) #if CONFIG_IS_ENABLED(MMC_WRITE) mmc->erase_grp_size = 1; #endif - mmc->part_config = MMCPART_NOAVAILABLE; err = mmc_startup_v4(mmc); if (err) @@ -2851,9 +2859,26 @@ int mmc_get_op_cond(struct mmc *mmc, bool quiet) return err; mmc->ddr_mode = 0; + mmc->part_config = MMCPART_NOAVAILABLE; + retry: mmc_set_initial_state(mmc); + /* + * Read partition access bits from partition config register before card reset command + * because these bits are reset to default value (User Data Area) during card reset. + * This allows us to preserve original value of partition access bits used by the code + * which loaded us (for example BootROM) and use it for board specific boot purposes. + */ + if (mmc->part_config == MMCPART_NOAVAILABLE) { + ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN); + err = mmc_send_ext_csd(mmc, ext_csd); + if (err == 0 && + ((ext_csd[EXT_CSD_PARTITIONING_SUPPORT] & PART_SUPPORT) || + ext_csd[EXT_CSD_BOOT_MULT])) + mmc->part_config = ext_csd[EXT_CSD_PART_CONF] & PART_ACCESS_MASK; + } + /* Reset the Card */ err = mmc_go_idle(mmc); |