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cmd: mmc: provide boot area protection command

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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>
This commit is contained in:
Heinrich Schuchardt 2020-03-30 07:24:19 +02:00 committed by Peng Fan
parent d5210e4589
commit 0469d84636
3 changed files with 36 additions and 0 deletions
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22
cmd/mmc.c
View file

@ -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"

5
drivers/mmc/mmc.c
View file

@ -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)

9
include/mmc.h
View file

@ -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;