/** @file
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Scs policy
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _SCS_CONFIG_H_
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#define _SCS_CONFIG_H_
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#define SCS_CONFIG_REVISION 1
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extern EFI_GUID gScsConfigGuid;
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#pragma pack (push,1)
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typedef enum {
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PchScsSdDisabled = 0,
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PchScsSdcardMode = 2
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} PCH_SCS_DEV_SD_MODE;
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typedef enum {
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DriverStrength33Ohm = 0,
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DriverStrength40Ohm,
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DriverStrength50Ohm
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} PCH_SCS_EMMC_DRIVER_STRENGTH;
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///
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/// The PCH_SCS_CONFIG block describes Storage and Communication Subsystem (SCS) settings for PCH.
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///
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typedef struct {
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CONFIG_BLOCK_HEADER Header; ///< Config Block Header
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UINT32 ScsEmmcEnabled : 2; ///< Determine if eMMC is enabled - 0: Disabled, <b>1: Enabled</b>.
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UINT32 ScsEmmcHs400Enabled : 1; ///< Determine eMMC HS400 Mode if ScsEmmcEnabled - <b>0: Disabled</b>, 1: Enabled
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/**
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Determine if HS400 Training is required, set to FALSE if Hs400 Data is valid. <b>0: Disabled</b>, 1: Enabled.
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First Boot or CMOS clear, system boot with Default settings, set tuning required.
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Subsequent Boots, Get Variable 'Hs400TuningData'
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- if failed to get variable, set tuning required
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- if passed, retrieve Hs400DataValid, Hs400RxStrobe1Dll and Hs400TxDataDll from variable. Set tuning not required.
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- if driver strength value changes (ScsEmmcHs400DriverStrength) re-tuning is required.
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**/
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UINT32 ScsEmmcHs400TuningRequired : 1;
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UINT32 ScsEmmcHs400DllDataValid : 1; ///< Set if HS400 Tuning Data Valid
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UINT32 ScsEmmcHs400RxStrobeDll1 : 7; ///< Rx Strobe Delay Control - Rx Strobe Delay DLL 1 (HS400 Mode)
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UINT32 ScsEmmcHs400TxDataDll : 7; ///< Tx Data Delay Control 1 - Tx Data Delay (HS400 Mode)
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UINT32 ScsEmmcHs400DriverStrength : 3; ///< I/O driver strength: 0 - 33 Ohm, <b>1 - 40 Ohm</b>, 2 - 50 Ohm
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UINT32 ScsSdSwitch : 3; ///< Determine the operating mode of SDHC. Refer to PCH_SCS_DEV_SD_MODE for each value - 0: Disabled, <b>2: SDCard</b>.
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UINT32 RsvdBits : 7;
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UINT32 Rsvd0; ///< Reserved bytes
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} PCH_SCS_CONFIG;
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#pragma pack (pop)
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#endif // _SCS_CONFIG_H_
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