diff options
Diffstat (limited to 'drivers/mmc/core/core.c')
| -rw-r--r-- | drivers/mmc/core/core.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 95fedcf56e4a..605f5e8648c1 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -2149,6 +2149,41 @@ 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 = |