Merge tag 'mmc-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc

[linux-2.6-microblaze.git] / drivers / mmc / core / core.c

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 6249c83..240c5af 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2150,6 +2150,41 @@ int mmc_detect_card_removed(struct mmc_host *host)
 }
 EXPORT_SYMBOL(mmc_detect_card_removed);
 
+int mmc_card_alternative_gpt_sector(struct mmc_card *card, sector_t *gpt_sector)
+{
+       unsigned int boot_sectors_num;
+
+       if ((!(card->host->caps2 & MMC_CAP2_ALT_GPT_TEGRA)))
+               return -EOPNOTSUPP;
+
+       /* filter out unrelated cards */
+       if (card->ext_csd.rev < 3 ||
+           !mmc_card_mmc(card) ||
+           !mmc_card_is_blockaddr(card) ||
+            mmc_card_is_removable(card->host))
+               return -ENOENT;
+
+       /*
+        * eMMC storage has two special boot partitions in addition to the
+        * main one.  NVIDIA's bootloader linearizes eMMC boot0->boot1->main
+        * accesses, this means that the partition table addresses are shifted
+        * by the size of boot partitions.  In accordance with the eMMC
+        * specification, the boot partition size is calculated as follows:
+        *
+        *      boot partition size = 128K byte x BOOT_SIZE_MULT
+        *
+        * Calculate number of sectors occupied by the both boot partitions.
+        */
+       boot_sectors_num = card->ext_csd.raw_boot_mult * SZ_128K /
+                          SZ_512 * MMC_NUM_BOOT_PARTITION;
+
+       /* Defined by NVIDIA and used by Android devices. */
+       *gpt_sector = card->ext_csd.sectors - boot_sectors_num - 1;
+
+       return 0;
+}
+EXPORT_SYMBOL(mmc_card_alternative_gpt_sector);
+
 void mmc_rescan(struct work_struct *work)
 {
        struct mmc_host *host =