mmc: boot partition ro lock support

Enable boot partitions to be read-only locked until next power on via
a sysfs entry. There will be one sysfs entry for each boot partition:

/sys/block/mmcblkXbootY/ro_lock_until_next_power_on

Each boot partition is locked by writing 1 to its file.

Signed-off-by: Johan Rudholm <johan.rudholm@stericsson.com>
Signed-off-by: John Beckett <john.beckett@stericsson.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index fc1059bb6a08..006e932a3ae3 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -348,7 +348,8 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
                                 mmc_part_add(card, part_size,
                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
-                                        "boot%d", idx, true);
+                                        "boot%d", idx, true,
+                                        MMC_BLK_DATA_AREA_BOOT);
                         }
                 }
         }
@@ -435,7 +436,8 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
                                         hc_wp_grp_sz);
                                 mmc_part_add(card, part_size << 19,
                                         EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
-                                        "gp%d", idx, false);
+                                        "gp%d", idx, false,
+                                        MMC_BLK_DATA_AREA_GP);
                         }
                 }
                 card->ext_csd.sec_trim_mult =
@@ -446,6 +448,14 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
                 card->ext_csd.trim_timeout = 300 *
                         ext_csd[EXT_CSD_TRIM_MULT];
+
+                /*
+                 * Note that the call to mmc_part_add above defaults to read
+                 * only. If this default assumption is changed, the call must
+                 * take into account the value of boot_locked below.
+                 */
+                card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
+                card->ext_csd.boot_ro_lockable = true;
         }
 
         if (card->ext_csd.rev >= 5) {