diff options
Diffstat (limited to 'ReferenceCode/Chipset/SystemAgent/SaInit/Pei/PcieTrainingEqSettings.c')
| -rw-r--r-- | ReferenceCode/Chipset/SystemAgent/SaInit/Pei/PcieTrainingEqSettings.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/ReferenceCode/Chipset/SystemAgent/SaInit/Pei/PcieTrainingEqSettings.c b/ReferenceCode/Chipset/SystemAgent/SaInit/Pei/PcieTrainingEqSettings.c new file mode 100644 index 0000000..dc4515e --- /dev/null +++ b/ReferenceCode/Chipset/SystemAgent/SaInit/Pei/PcieTrainingEqSettings.c @@ -0,0 +1,166 @@ +/*++ @file + This file adds equalization setting support. + +@copyright + Copyright (c) 2012 Intel Corporation. All rights reserved + This software and associated documentation (if any) is furnished + under a license and may only be used or copied in accordance + with the terms of the license. Except as permitted by such + license, no part of this software or documentation may be + reproduced, stored in a retrieval system, or transmitted in any + form or by any means without the express written consent of + Intel Corporation. + + This file contains an 'Intel Peripheral Driver' and uniquely + identified as "Intel Reference Module" and is + licensed for Intel CPUs and chipsets under the terms of your + license agreement with Intel or your vendor. This file may + be modified by the user, subject to additional terms of the + license agreement + +--*/ + +#include "PcieTraining.h" +#include "PciExpressInit.h" + +#ifdef PEG_FLAG + +VOID +GetLinkPartnerFullSwing ( + IN UINT8 Lane, + OUT UINT8 *FullSwing + ) +{ + UINT32 Data32; + + Data32 = BIT25 | BIT23 | (Lane << 19) | BIT18; + McD1PciCfg32(R_SA_PEG_EQPH3_OFFSET) = Data32; + Data32 = McD1PciCfg32(R_SA_PEG_EQPH3_OFFSET); + McD1PciCfg32(R_SA_PEG_EQPH3_OFFSET) = 0; + + *FullSwing = (Data32 >> 6) & 0x3F; + + return; +} + +VOID +GetCoefficientsFromPreset ( + IN UINT8 Preset, + IN UINT8 FullSwing, + OUT UINT8 *PreCursor, + OUT UINT8 *Cursor, + OUT UINT8 *PostCursor + ) +{ + INT32 PreCursorMilli; + INT32 PostCursorMilli; + + PreCursorMilli = 0; + PostCursorMilli = 0; + + /// + /// Get starting values from Table 4-16 of the PCIe Base Spec v3.0 + /// + switch (Preset) { + case 0: + PreCursorMilli = 0; + PostCursorMilli = -250; + break; + + case 1: + PreCursorMilli = 0; + PostCursorMilli = -167; + break; + + case 2: + PreCursorMilli = 0; + PostCursorMilli = -200; + break; + + case 3: + PreCursorMilli = 0; + PostCursorMilli = -125; + break; + + case 4: + PreCursorMilli = 0; + PostCursorMilli = 0; + break; + + case 5: + PreCursorMilli = -100; + PostCursorMilli = 0; + break; + + case 6: + PreCursorMilli = -125; + PostCursorMilli = 0; + break; + + case 7: + PreCursorMilli = -100; + PostCursorMilli = -200; + break; + + case 8: + PreCursorMilli = -125; + PostCursorMilli = -125; + break; + + case 9: + PreCursorMilli = -166; + PostCursorMilli = 0; + break; + + case 10: ///< P10 is unsupported + default: + PreCursorMilli = -100; + PostCursorMilli = -200; + DEBUG ((EFI_D_WARN, "GetCoefficientsFromPreset(): Unsupported Preset Requested: P%d. Using P7.\n", Preset)); + break; + } + + /// + /// Convert to absolute values + /// + if (PreCursorMilli < 0) { + PreCursorMilli *= -1; + } + if (PostCursorMilli < 0) { + PostCursorMilli *= -1; + } + + /// + /// Apply FullSwing + /// + PreCursorMilli *= FullSwing; + PostCursorMilli *= FullSwing; + + /// + /// Convert to integers + /// + *PreCursor = (( PreCursorMilli % 1000) >= 500) ? (UINT8) (( PreCursorMilli / 1000) + 1) : (UINT8) ( PreCursorMilli / 1000); + *PostCursor = ((PostCursorMilli % 1000) >= 500) ? (UINT8) ((PostCursorMilli / 1000) + 1) : (UINT8) (PostCursorMilli / 1000); + *Cursor = FullSwing - (*PreCursor) - (*PostCursor); + + return; +} + +VOID +SetPartnerTxCoefficients ( + IN UINT8 Lane, + IN UINT8 *PreCursor, + IN UINT8 *Cursor, + IN UINT8 *PostCursor + ) +{ + UINT32 Data32; + + Data32 = (Lane << 19) | BIT18 | (*Cursor << 12) | (*PreCursor << 6) | (*PostCursor); + McD1PciCfg32(R_SA_PEG_EQPH3_OFFSET) = Data32; + McD1PciCfg32(R_SA_PEG_EQPH3_OFFSET) = 0; + + return; +} + +#endif // PEG_FLAG |