mirror of https://github.com/acidanthera/audk.git
132 lines
2.6 KiB
C
132 lines
2.6 KiB
C
/**
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Copyright (c) 2012 - 2014, Intel Corporation. All rights reserved
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@file
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PchPlatformLib.c
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@brief
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PCH Platform Lib implementation.
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**/
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#include "PchPlatformLibrary.h"
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//
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// Silicon Steppings
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//
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/**
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Return Pch stepping type
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@param[in] None
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@retval PCH_STEPPING Pch stepping type
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**/
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PCH_STEPPING
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EFIAPI
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PchStepping (
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VOID
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)
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{
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UINT8 RevId;
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RevId = MmioRead8 (
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MmPciAddress (0,
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DEFAULT_PCI_BUS_NUMBER_PCH,
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PCI_DEVICE_NUMBER_PCH_LPC,
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PCI_FUNCTION_NUMBER_PCH_LPC,
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R_PCH_LPC_RID_CC)
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);
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switch (RevId) {
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case V_PCH_LPC_RID_0:
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case V_PCH_LPC_RID_1:
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return PchA0;
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break;
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case V_PCH_LPC_RID_2:
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case V_PCH_LPC_RID_3:
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return PchA1;
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break;
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case V_PCH_LPC_RID_4:
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case V_PCH_LPC_RID_5:
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return PchB0;
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break;
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case V_PCH_LPC_RID_6:
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case V_PCH_LPC_RID_7:
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return PchB1;
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break;
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case V_PCH_LPC_RID_8:
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case V_PCH_LPC_RID_9:
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return PchB2;
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break;
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case V_PCH_LPC_RID_A:
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case V_PCH_LPC_RID_B:
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return PchB3;
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break;
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case V_PCH_LPC_RID_C:
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case V_PCH_LPC_RID_D:
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return PchC0;
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break;
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case V_PCH_LPC_RID_E:
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case V_PCH_LPC_RID_F:
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return PchD0;
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break;
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default:
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return PchSteppingMax;
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break;
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}
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}
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/**
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Determine if PCH is supported
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@param[in] None
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@retval TRUE PCH is supported
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@retval FALSE PCH is not supported
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**/
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BOOLEAN
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IsPchSupported (
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VOID
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)
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{
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UINT32 Identifiers;
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UINT16 PcuVendorId;
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UINT16 PcuDeviceId;
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Identifiers = MmioRead32 (
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MmPciAddress (0,
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DEFAULT_PCI_BUS_NUMBER_PCH,
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PCI_DEVICE_NUMBER_PCH_LPC,
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PCI_FUNCTION_NUMBER_PCH_LPC,
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R_PCH_LPC_REG_ID)
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);
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PcuDeviceId = (UINT16) ((Identifiers & B_PCH_LPC_DEVICE_ID) >> 16);
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PcuVendorId = (UINT16) (Identifiers & B_PCH_LPC_VENDOR_ID);
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//
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// Verify that this is a supported chipset
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//
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if (PcuVendorId != (UINT16) V_PCH_LPC_VENDOR_ID || !IS_PCH_VLV_LPC_DEVICE_ID (PcuDeviceId)) {
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DEBUG ((EFI_D_ERROR, "VLV SC code doesn't support the PcuDeviceId: 0x%04x!\n", PcuDeviceId));
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return FALSE;
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}
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return TRUE;
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}
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