cmd: mmc: provide boot area protection command
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>
diff --git a/cmd/mmc.c b/cmd/mmc.c
index 6d71208..6142ec8 100644
--- a/cmd/mmc.c
+++ b/cmd/mmc.c
@@ -896,9 +896,30 @@
}
#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 @@
"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 bfcdaa6..fc3123c 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -810,6 +810,11 @@
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 85fc349..e92e920 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -907,6 +907,15 @@
*/
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;