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drivers: mmc: write protect single boot area

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Add features to write protect single boot area rather than all boot
areas.

Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Ying-Chun Liu (PaulLiu) 2022-04-25 21:59:02 +08:00 committed by Jaehoon Chung
parent 3363a73ddf
commit 19a29ff362
2 changed files with 43 additions and 0 deletions
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27
drivers/mmc/mmc.c
View file

@ -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)

16
include/mmc.h
View file

@ -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;