From 19a29ff362d4cc9e7f420021de57e3193812d4c6 Mon Sep 17 00:00:00 2001 From: "Ying-Chun Liu (PaulLiu)" Date: Mon, 25 Apr 2022 21:59:02 +0800 Subject: [PATCH] drivers: mmc: write protect single boot area Add features to write protect single boot area rather than all boot areas. Signed-off-by: Ying-Chun Liu (PaulLiu) Cc: Peng Fan Cc: Jaehoon Chung --- drivers/mmc/mmc.c | 27 +++++++++++++++++++++++++++ include/mmc.h | 16 ++++++++++++++++ 2 files changed, 43 insertions(+) diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 12d29da..8efee99 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -863,6 +863,33 @@ int mmc_boot_wp(struct mmc *mmc) return mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP, 1); } +int mmc_boot_wp_single_partition(struct mmc *mmc, int partition) +{ + u8 value; + int ret; + + value = EXT_CSD_BOOT_WP_B_PWR_WP_EN; + + if (partition == 0) { + value |= EXT_CSD_BOOT_WP_B_SEC_WP_SEL; + ret = mmc_switch(mmc, + EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_BOOT_WP, + value); + } else if (partition == 1) { + value |= EXT_CSD_BOOT_WP_B_SEC_WP_SEL; + value |= EXT_CSD_BOOT_WP_B_PWR_WP_SEC_SEL; + ret = mmc_switch(mmc, + EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_BOOT_WP, + value); + } else { + ret = mmc_boot_wp(mmc); + } + + return ret; +} + #if !CONFIG_IS_ENABLED(MMC_TINY) static int mmc_set_card_speed(struct mmc *mmc, enum bus_mode mode, bool hsdowngrade) diff --git a/include/mmc.h b/include/mmc.h index 073b01f..f519d86 100644 --- a/include/mmc.h +++ b/include/mmc.h @@ -308,6 +308,10 @@ static inline bool mmc_is_tuning_cmd(uint cmdidx) #define EXT_CSD_HS_CTRL_REL (1 << 0) /* host controlled WR_REL_SET */ +#define EXT_CSD_BOOT_WP_B_SEC_WP_SEL (0x80) /* enable partition selector */ +#define EXT_CSD_BOOT_WP_B_PWR_WP_SEC_SEL (0x02) /* partition selector to protect */ +#define EXT_CSD_BOOT_WP_B_PWR_WP_EN (0x01) /* power-on write-protect */ + #define EXT_CSD_WR_DATA_REL_USR (1 << 0) /* user data area WR_REL */ #define EXT_CSD_WR_DATA_REL_GP(x) (1 << ((x)+1)) /* GP part (x+1) WR_REL */ @@ -991,6 +995,18 @@ int mmc_send_ext_csd(struct mmc *mmc, u8 *ext_csd); */ int mmc_boot_wp(struct mmc *mmc); +/** + * mmc_boot_wp_single_partition() - set write protection to a boot partition. + * + * This function sets a single boot partition to protect and leave the + * other partition writable. + * + * @param mmc the mmc device. + * @param partition 0 - first boot partition, 1 - second boot partition. + * @return 0 for success + */ +int mmc_boot_wp_single_partition(struct mmc *mmc, int partition); + static inline enum dma_data_direction mmc_get_dma_dir(struct mmc_data *data) { return data->flags & MMC_DATA_WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE; -- 2.7.4