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>

2 files changed, 15 insertions, 1 deletions

diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 6402d9224d6a..9478a6bf1bb1 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -71,6 +71,8 @@ struct mmc_ext_csd {
         bool                    hpi_en;                 /* HPI enablebit */
         bool                    hpi;                    /* HPI support bit */
         unsigned int            hpi_cmd;                /* cmd used as HPI */
+        unsigned int            boot_ro_lock;           /* ro lock support */
+        bool                    boot_ro_lockable;
         u8                      raw_partition_support;  /* 160 */
         u8                      raw_erased_mem_count;   /* 181 */
         u8                      raw_ext_csd_structure;  /* 194 */
@@ -187,6 +189,10 @@ struct mmc_part {
         unsigned int    part_cfg;       /* partition type */
         char    name[MAX_MMC_PART_NAME_LEN];
         bool    force_ro;       /* to make boot parts RO by default */
+        unsigned int    area_type;
+#define MMC_BLK_DATA_AREA_MAIN  (1<<0)
+#define MMC_BLK_DATA_AREA_BOOT  (1<<1)
+#define MMC_BLK_DATA_AREA_GP    (1<<2)
 };
 
 /*
@@ -265,12 +271,14 @@ struct mmc_card {
  * This function fill contents in mmc_part.
  */
 static inline void mmc_part_add(struct mmc_card *card, unsigned int size,
-                        unsigned int part_cfg, char *name, int idx, bool ro)
+                        unsigned int part_cfg, char *name, int idx, bool ro,
+                        int area_type)
 {
         card->part[card->nr_parts].size = size;
         card->part[card->nr_parts].part_cfg = part_cfg;
         sprintf(card->part[card->nr_parts].name, name, idx);
         card->part[card->nr_parts].force_ro = ro;
+        card->part[card->nr_parts].area_type = area_type;
         card->nr_parts++;
 }
 
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 0e7135697d11..665548e639e8 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -280,6 +280,7 @@ struct _mmc_csd {
 #define EXT_CSD_RST_N_FUNCTION          162     /* R/W */
 #define EXT_CSD_SANITIZE_START          165     /* W */
 #define EXT_CSD_WR_REL_PARAM            166     /* RO */
+#define EXT_CSD_BOOT_WP                 173     /* R/W */
 #define EXT_CSD_ERASE_GROUP_DEF         175     /* R/W */
 #define EXT_CSD_PART_CONFIG             179     /* R/W */
 #define EXT_CSD_ERASED_MEM_CONT         181     /* RO */
@@ -321,6 +322,11 @@ struct _mmc_csd {
 
 #define EXT_CSD_WR_REL_PARAM_EN         (1<<2)
 
+#define EXT_CSD_BOOT_WP_B_PWR_WP_DIS    (0x40)
+#define EXT_CSD_BOOT_WP_B_PERM_WP_DIS   (0x10)
+#define EXT_CSD_BOOT_WP_B_PERM_WP_EN    (0x04)
+#define EXT_CSD_BOOT_WP_B_PWR_WP_EN     (0x01)
+
 #define EXT_CSD_PART_CONFIG_ACC_MASK    (0x7)
 #define EXT_CSD_PART_CONFIG_ACC_BOOT0   (0x1)
 #define EXT_CSD_PART_CONFIG_ACC_GP0     (0x4)