diff options
Diffstat (limited to 'src/soc/amd')
| -rw-r--r-- | src/soc/amd/picasso/chip.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/soc/amd/picasso/chip.h b/src/soc/amd/picasso/chip.h index 9c9ae7f7cd..a39549e5a3 100644 --- a/src/soc/amd/picasso/chip.h +++ b/src/soc/amd/picasso/chip.h @@ -39,6 +39,13 @@ struct __packed usb2_phy_tune { #define USB_PORT_COUNT 6 +enum sd_emmc_driver_strength { + SD_EMMC_DRIVE_STRENGTH_B, + SD_EMMC_DRIVE_STRENGTH_A, + SD_EMMC_DRIVE_STRENGTH_C, + SD_EMMC_DRIVE_STRENGTH_D, +}; + struct soc_amd_picasso_config { struct soc_amd_common_config common_config; /* @@ -162,6 +169,26 @@ struct soc_amd_picasso_config { SD_EMMC_EMMC_HS400, SD_EMMC_EMMC_HS300, } timing; + + /* + * Sets the driver strength reflected in the SDHCI Preset Value Registers. + * + * According to the SDHCI spec: + * The host should select the weakest drive strength that meets rise / + * fall time requirement at system operating frequency. + */ + enum sd_emmc_driver_strength sdr104_hs400_driver_strength; + enum sd_emmc_driver_strength ddr50_driver_strength; + enum sd_emmc_driver_strength sdr50_driver_strength; + + /* + * Sets the frequency in kHz reflected in the Initialization Preset Value + * Register. + * + * This value is used while in open-drain mode, and has a maximum value of + * 400 kHz. + */ + uint16_t init_khz_preset; } emmc_config; uint8_t xhci0_force_gen1; |