Provide command 'mmc wp' to power on write protect boot areas on eMMC devices.
The B_PWR_WP_EN bit in the extended CSD register BOOT_WP is set. The boot area are write protected until the next power cycle occurs.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- cmd/mmc.c | 22 ++++++++++++++++++++++ drivers/mmc/mmc.c | 5 +++++ include/mmc.h | 9 +++++++++ 3 files changed, 36 insertions(+)
diff --git a/cmd/mmc.c b/cmd/mmc.c index d62c85e439..80a32d9fa9 100644 --- a/cmd/mmc.c +++ b/cmd/mmc.c @@ -896,9 +896,30 @@ static int do_mmc_bkops_enable(cmd_tbl_t *cmdtp, int flag, } #endif
+static int do_mmc_boot_wp(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + int err; + struct mmc *mmc; + + mmc = init_mmc_device(curr_device, false); + if (!mmc) + return CMD_RET_FAILURE; + if (IS_SD(mmc)) { + printf("It is not an eMMC device\n"); + return CMD_RET_FAILURE; + } + err = mmc_boot_wp(mmc); + if (err) + return CMD_RET_FAILURE; + printf("boot areas protected\n"); + return CMD_RET_SUCCESS; +} + static cmd_tbl_t cmd_mmc[] = { U_BOOT_CMD_MKENT(info, 1, 0, do_mmcinfo, "", ""), U_BOOT_CMD_MKENT(read, 4, 1, do_mmc_read, "", ""), + U_BOOT_CMD_MKENT(wp, 1, 0, do_mmc_boot_wp, "", ""), #if CONFIG_IS_ENABLED(MMC_WRITE) U_BOOT_CMD_MKENT(write, 4, 0, do_mmc_write, "", ""), U_BOOT_CMD_MKENT(erase, 3, 0, do_mmc_erase, "", ""), @@ -968,6 +989,7 @@ U_BOOT_CMD( "mmc part - lists available partition on current mmc device\n" "mmc dev [dev] [part] - show or set current mmc device [partition]\n" "mmc list - lists available devices\n" + "mmc wp - power on write protect booot partitions\n" #if CONFIG_IS_ENABLED(MMC_HW_PARTITIONING) "mmc hwpartition [args...] - does hardware partitioning\n" " arguments (sizes in 512-byte blocks):\n" diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index bfcdaa665d..fc3123c3c3 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -810,6 +810,11 @@ int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value) return __mmc_switch(mmc, set, index, value, true); }
+int mmc_boot_wp(struct mmc *mmc) +{ + return mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP, 1); +} + #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 85fc3497a1..e92e920560 100644 --- a/include/mmc.h +++ b/include/mmc.h @@ -907,6 +907,15 @@ struct blk_desc *mmc_get_blk_desc(struct mmc *mmc); */ int mmc_send_ext_csd(struct mmc *mmc, u8 *ext_csd);
+/** + * mmc_boot_wp() - power on write protect boot partitions + * + * The boot partitions are write protected until the next power cycle. + * + * Return: 0 for success + */ +int mmc_boot_wp(struct mmc *mmc); + 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; -- 2.25.1