[edk2-platforms][PATCH v4 13/31] JadePkg: Add BoardPcieLib library instance

["Nhi Pham" <nhi@os.amperecomputing.com>]

From: Vu Nguyen <vunguyen@os.amperecomputing.com>

Provide Mt. Jade specific segment number for each Root Complex and
function to handle the PCIe PERST.

Cc: Thang Nguyen <thang@os.amperecomputing.com>
Cc: Chuong Tran <chuong@os.amperecomputing.com>
Cc: Phong Vo <phong@os.amperecomputing.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>

Signed-off-by: Nhi Pham <nhi@os.amperecomputing.com>
---
 Platform/Ampere/JadePkg/Jade.dsc                              |   2 +-
 Platform/Ampere/JadePkg/Library/BoardPcieLib/BoardPcieLib.inf |  27 +++++
 Platform/Ampere/JadePkg/Library/BoardPcieLib/BoardPcieLib.c   | 115 ++++++++++++++++++++
 3 files changed, 143 insertions(+), 1 deletion(-)

diff --git a/Platform/Ampere/JadePkg/Jade.dsc b/Platform/Ampere/JadePkg/Jade.dsc
index 23a297d0dbeb..9315c1c71cc7 100644
--- a/Platform/Ampere/JadePkg/Jade.dsc
+++ b/Platform/Ampere/JadePkg/Jade.dsc
@@ -85,7 +85,7 @@ [LibraryClasses]
   #
   # Pcie Board
   #
-  BoardPcieLib|Silicon/Ampere/AmpereAltraPkg/Library/BoardPcieLibNull/BoardPcieLibNull.inf
+  BoardPcieLib|Platform/Ampere/JadePkg/Library/BoardPcieLib/BoardPcieLib.inf
 
 ################################################################################
 #
diff --git a/Platform/Ampere/JadePkg/Library/BoardPcieLib/BoardPcieLib.inf b/Platform/Ampere/JadePkg/Library/BoardPcieLib/BoardPcieLib.inf
new file mode 100644
index 000000000000..1d722bceff2c
--- /dev/null
+++ b/Platform/Ampere/JadePkg/Library/BoardPcieLib/BoardPcieLib.inf
@@ -0,0 +1,27 @@
+## @file
+#
+# Copyright (c) 2020 - 2021, Ampere Computing LLC. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001001B
+  BASE_NAME                      = BoardPcieLib
+  FILE_GUID                      = 062191A6-E113-4FD6-84C7-E400B4B34759
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = BoardPcieLib
+
+[Sources]
+  BoardPcieLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dec
+
+[LibraryClasses]
+  DebugLib
+  GpioLib
+  TimerLib
diff --git a/Platform/Ampere/JadePkg/Library/BoardPcieLib/BoardPcieLib.c b/Platform/Ampere/JadePkg/Library/BoardPcieLib/BoardPcieLib.c
new file mode 100644
index 000000000000..4a9da7eeb4fe
--- /dev/null
+++ b/Platform/Ampere/JadePkg/Library/BoardPcieLib/BoardPcieLib.c
@@ -0,0 +1,115 @@
+/** @file
+  Pcie board specific driver to handle asserting PERST signal to Endpoint
+  card. PERST asserting is via group of GPIO pins to CPLD as Platform Specification.
+
+  Copyright (c) 2020 - 2021, Ampere Computing LLC. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiDxe.h>
+
+#include <Guid/RootComplexInfoHob.h>
+#include <Library/DebugLib.h>
+#include <Library/GpioLib.h>
+#include <Library/TimerLib.h>
+#include <Platform/Ac01.h>
+
+#define RCA_MAX_PERST_GROUPVAL          62
+#define RCB_MAX_PERST_GROUPVAL          46
+
+VOID
+BoardPcieReleaseAllPerst (
+  IN UINT8 SocketId
+  )
+{
+  UINT32 GpioIndex, GpioPin;
+
+  // Write 1 to all GPIO[16..21] to release all PERST
+  GpioPin = AC01_GPIO_PINS_PER_SOCKET * SocketId + 16;
+  for (GpioIndex = 0; GpioIndex < 6; GpioIndex++) {
+    GpioModeConfig (GpioPin + GpioIndex, GpioConfigOutHigh);
+  }
+}
+
+/**
+  Assert PERST of PCIe controller
+
+  @param[in]  RootComplex           Root Complex instance.
+  @param[in]  PcieIndex             PCIe controller index of input Root Complex.
+  @param[in]  IsPullToHigh          Target status for the PERST.
+
+  @retval RETURN_SUCCESS            The operation is successful.
+  @retval Others                    An error occurred.
+**/
+RETURN_STATUS
+EFIAPI
+BoardPcieAssertPerst (
+  IN AC01_ROOT_COMPLEX *RootComplex,
+  IN UINT8             PcieIndex,
+  IN BOOLEAN           IsPullToHigh
+  )
+{
+  UINT32 GpioGroupVal, Val, GpioIndex, GpioPin;
+
+  if (!IsPullToHigh) {
+    if (RootComplex->Type == RootComplexTypeA) {
+      //
+      // RootComplexTypeA: RootComplex->ID: 0->3 ; PcieIndex: 0->3
+      //
+      GpioGroupVal = RCA_MAX_PERST_GROUPVAL - RootComplex->ID * MaxPcieControllerA - PcieIndex;
+    } else {
+      //
+      // RootComplexTypeB: RootComplex->ID: 4->7 ; PcieIndex: 0->7
+      //
+      GpioGroupVal = RCB_MAX_PERST_GROUPVAL - (RootComplex->ID - MaxRootComplexA) * MaxPcieControllerB - PcieIndex;
+    }
+
+    // Update the value of GPIO[16..21]. Corresponding PERST line will be decoded by CPLD.
+    GpioPin = AC01_GPIO_PINS_PER_SOCKET * RootComplex->Socket + 16;
+    for (GpioIndex = 0; GpioIndex < 6; GpioIndex++) {
+      Val = (GpioGroupVal & 0x3F) & (1 << GpioIndex);
+      if (Val == 0) {
+        GpioModeConfig (GpioPin + GpioIndex, GpioConfigOutLow);
+      } else {
+        GpioModeConfig (GpioPin + GpioIndex, GpioConfigOutHigh);
+      }
+    }
+
+    // Keep reset as low as 100 ms as specification
+    MicroSecondDelay (100 * 1000);
+  } else {
+    BoardPcieReleaseAllPerst (RootComplex->Socket);
+  }
+
+  return RETURN_SUCCESS;
+}
+
+/**
+  Override the segment number for a root complex with a board specific number.
+
+  @param[in]  RootComplex           Root Complex instance with properties.
+
+  @retval Segment number corresponding to the input root complex.
+          Default segment number is 0x0F.
+**/
+UINT16
+BoardPcieGetSegmentNumber (
+  IN  AC01_ROOT_COMPLEX *RootComplex
+  )
+{
+  UINT8 Ac01BoardSegment[PLATFORM_CPU_MAX_SOCKET][AC01_PCIE_MAX_ROOT_COMPLEX] =
+                          {
+                            { 0x0C, 0x0D, 0x01, 0x00, 0x02, 0x03, 0x04, 0x05 },
+                            { 0x10, 0x11, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B }
+                          };
+
+  if (RootComplex->Socket < PLATFORM_CPU_MAX_SOCKET
+      && RootComplex->ID < AC01_PCIE_MAX_ROOT_COMPLEX) {
+    return Ac01BoardSegment[RootComplex->Socket][RootComplex->ID];
+  }
+
+  // Return default segment number
+  return 0x0F;
+}
-- 
2.17.1