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- /** @file
- Intel Graphics I2C Bus I/O
- Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- <b>Conventions</b>:
- - Prefixes:
- - Definitions beginning with "R_" are registers
- - Definitions beginning with "B_" are bits within registers
- - Definitions beginning with "V_" are meaningful values of bits within the registers
- - Definitions beginning with "S_" are register sizes
- - Definitions beginning with "N_" are the bit position
- **/
- #include <Uefi/UefiBaseType.h>
- #include <Library/HdmiDebugPchDetectionLib.h>
- //
- // HDMI DDC Pin Pairs
- //
- #define V_CNL_PCH_HDMI_DDC_B_PIN_PAIR 0x01
- #define V_CNL_PCH_HDMI_DDC_C_PIN_PAIR 0x02
- #define V_CNL_PCH_HDMI_DDC_D_PIN_PAIR 0x04
- #define V_CNL_PCH_HDMI_DDC_F_PIN_PAIR 0x03
- #define V_KBL_PCH_HDMI_DDC_B_PIN_PAIR 0x05
- #define V_KBL_PCH_HDMI_DDC_C_PIN_PAIR 0x04
- #define V_KBL_PCH_HDMI_DDC_D_PIN_PAIR 0x06
- typedef enum {
- EnumDdcUnknown = 0,
- EnumDdcA,
- EnumDdcB,
- EnumDdcC,
- EnumDdcD,
- EnumDdcE,
- EnumDdcF,
- EnumI2cChannelMax
- } IGFX_I2C_CHANNEL;
- /**
- Returns the type of PCH on the system
- @retval The PCH type.
- **/
- PCH_TYPE
- GetPchType (
- VOID
- );
- /**
- Returns the GPIO pin pair to use for the given DDC channel
- @param[in] Channel - The DDC I2C channel.
- @param[out] DdcBusPinPair - The GPIO pin pair for the given DDC channel.
- @retval EFI_SUCCESS - The GPIO pin pair was successfully determined
- @retval EFI_INVALID_PARAMETER - The given DDC I2C channel does not exist.
- @retval EFI_UNSUPPORTED - The platform is using a PCH that is not supported yet.
- **/
- EFI_STATUS
- GetGmbusBusPinPair (
- IN IGFX_I2C_CHANNEL Channel,
- OUT UINT8 *DdcBusPinPair
- );
- /**
- Returns the GPIO pin pair to use for the I2C HDMI debug port
- @param[out] DdcBusPinPair - The GPIO pin pair for the I2C HDMI debug port.
- @retval EFI_SUCCESS - The GPIO pin pair was successfully determined
- @retval EFI_INVALID_PARAMETER - The given DDC I2C channel does not exist.
- @retval EFI_UNSUPPORTED - The platform is using a PCH that is not supported yet.
- **/
- EFI_STATUS
- GetGmbusBusPinPairForI2cDebugPort (
- OUT UINT8 *DdcBusPinPair
- );
- /**
- For boot phases that utilize task priority levels (TPLs), this function raises
- the TPL to the appriopriate level needed to execute I/O to the I2C Debug Port
- **/
- VOID
- RaiseTplForI2cDebugPortAccess (
- VOID
- );
- /**
- For boot phases that utilize task priority levels (TPLs), this function
- restores the TPL to the previous level after I/O to the I2C Debug Port is
- complete
- **/
- VOID
- RestoreTplAfterI2cDebugPortAccess (
- VOID
- );
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