diff options
| author | Raul E Rangel <rrangel@chromium.org> | 2020-09-03 15:41:58 -0600 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-09-28 09:39:25 +0000 |
| commit | 5590d9aa753f34aac91ade155d06e5e8c5d364f1 (patch) | |
| tree | b6a668119a99fbc2864e788daaa9bedb84a5a996 /src/soc/amd/picasso | |
| parent | 60d800537bd21ba788efcc6a3b41549e893e3da8 (diff) | |
soc/amd/picasso: Add eMMC driver strength and init kHz settings
This allows passing in the presets to FSP.
I will set the UPD values after all the zork boards have had their
presets correctly set. This way we don't override the UPD defaults with
0s.
BUG=b:159823235
TEST=Build test
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I44951cacb1e9d788016a70283cf9688bf88a09f4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45097
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Diffstat (limited to 'src/soc/amd/picasso')
| -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; |