From: Jeremy Linton <lintonrjeremy@gmail.com>

Signed-off-by: Pete Batard <pete@akeo.ie>
---
 Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLib.c            | 193 ++++++++++++++++
 Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLib.inf          |  51 +++++
 Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLibConstructor.c | 235 ++++++++++++++++++++
 3 files changed, 479 insertions(+)

diff --git a/Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLib.c b/Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLib.c
new file mode 100644
index 000000000000..e642bf4e246a
--- /dev/null
+++ b/Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLib.c
@@ -0,0 +1,193 @@
+/** @file
+ *
+ * PCI Host Bridge Library instance for Bcm2711 ARM SOC
+ *
+ * Copyright (c) 2019, Jeremy Linton
+ * Copyright (c) 2017, Linaro Ltd. All rights reserved.<BR>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause-Patent
+ *
+ **/
+
+#include <IndustryStandard/Bcm2711.h>
+#include <IndustryStandard/Pci22.h>
+#include <Library/DebugLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PcdLib.h>
+#include <Library/PciHostBridgeLib.h>
+#include <PiDxe.h>
+#include <Protocol/PciRootBridgeIo.h>
+#include <Protocol/PciHostBridgeResourceAllocation.h>
+
+#pragma pack(1)
+
+typedef PACKED struct {
+  ACPI_HID_DEVICE_PATH     AcpiDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL EndDevicePath;
+} EFI_PCI_ROOT_BRIDGE_DEVICE_PATH;
+
+#pragma pack ()
+
+STATIC CONST EFI_PCI_ROOT_BRIDGE_DEVICE_PATH mEfiPciRootBridgeDevicePath[] = {
+  {
+    {
+      {
+        ACPI_DEVICE_PATH,
+        ACPI_DP,
+        {
+          (UINT8)(sizeof (ACPI_HID_DEVICE_PATH)),
+          (UINT8)(sizeof (ACPI_HID_DEVICE_PATH) >> 8)
+        }
+      },
+      EISA_PNP_ID (0x0A08), // PCI Express
+      0
+    },
+
+    {
+      END_DEVICE_PATH_TYPE,
+      END_ENTIRE_DEVICE_PATH_SUBTYPE,
+      {
+        END_DEVICE_PATH_LENGTH,
+        0
+      }
+    }
+  },
+};
+
+GLOBAL_REMOVE_IF_UNREFERENCED
+CHAR16 *mPciHostBridgeLibAcpiAddressSpaceTypeStr[] = {
+  L"Mem", L"I/O", L"Bus"
+};
+
+// these should come from the pcd...
+#define BCM2711_PCI_SEG0_BUSNUM_MIN     0x00
+#define BCM2711_PCI_SEG0_BUSNUM_MAX     0xFF
+#define BCM2711_PCI_SEG0_PORTIO_MIN     0x01
+#define BCM2711_PCI_SEG0_PORTIO_MAX     0x00 //MIN>MAX disables PIO
+#define BCM2711_PCI_SEG0_PORTIO_OFFSET  0x00
+// the bridge thinks its MMIO is here (which means it can't access this area in phy ram)
+#define BCM2711_PCI_SEG0_MMIO32_MIN     PCIE_TOP_OF_MEM_WIN
+#define BCM2711_PCI_SEG0_MMIO32_MAX     (PCIE_TOP_OF_MEM_WIN + PCIE_BRIDGE_MMIO_LEN)
+// the CPU views it via a window here..
+#define BCM2711_PCI_SEG0_MMIO32_XLATE   (PCIE_CPU_MMIO_WINDOW - PCIE_TOP_OF_MEM_WIN)
+
+// we might be able to size another region?
+#define BCM2711_PCI_SEG0_MMIO64_MIN     0x00
+#define BCM2711_PCI_SEG0_MMIO64_MAX     0x00
+
+//
+// See description in MdeModulePkg/Include/Library/PciHostBridgeLib.h
+//
+PCI_ROOT_BRIDGE mPciRootBridges[] = {
+  {
+    0,                                      // Segment
+    0,                                      // Supports
+    0,                                      // Attributes
+    FALSE,                                  // DmaAbove4G
+    FALSE,                                  // NoExtendedConfigSpace (true=256 byte config, false=4k)
+    FALSE,                                  // ResourceAssigned
+    EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM,   // AllocationAttributes
+    { BCM2711_PCI_SEG0_BUSNUM_MIN,
+      BCM2711_PCI_SEG0_BUSNUM_MAX },        // Bus
+    { BCM2711_PCI_SEG0_PORTIO_MIN,
+      BCM2711_PCI_SEG0_PORTIO_MAX,
+      MAX_UINT64 - BCM2711_PCI_SEG0_PORTIO_OFFSET + 1 },   // Io
+    { BCM2711_PCI_SEG0_MMIO32_MIN,
+      BCM2711_PCI_SEG0_MMIO32_MAX,
+      MAX_UINT64 - BCM2711_PCI_SEG0_MMIO32_XLATE + 1 },    // Mem
+    { MAX_UINT64, 0x0 },                    // MemAbove4G
+    { MAX_UINT64, 0x0 },                    // Pefetchable Mem
+    { MAX_UINT64, 0x0 },                    // Pefetchable MemAbove4G
+    (EFI_DEVICE_PATH_PROTOCOL *)&mEfiPciRootBridgeDevicePath[0]
+  }
+};
+
+/**
+  Return all the root bridge instances in an array.
+
+  @param Count  Return the count of root bridge instances.
+
+  @return All the root bridge instances in an array.
+          The array should be passed into PciHostBridgeFreeRootBridges()
+          when it's not used.
+**/
+PCI_ROOT_BRIDGE *
+EFIAPI
+PciHostBridgeGetRootBridges (
+  OUT UINTN     *Count
+  )
+{
+    *Count = ARRAY_SIZE (mPciRootBridges);
+    return mPciRootBridges;
+}
+
+/**
+  Free the root bridge instances array returned from PciHostBridgeGetRootBridges().
+
+  @param Bridges The root bridge instances array.
+  @param Count   The count of the array.
+**/
+VOID
+EFIAPI
+PciHostBridgeFreeRootBridges (
+  PCI_ROOT_BRIDGE *Bridges,
+  UINTN           Count
+  )
+{
+}
+
+/**
+  Inform the platform that the resource conflict happens.
+
+  @param HostBridgeHandle Handle of the Host Bridge.
+  @param Configuration    Pointer to PCI I/O and PCI memory resource
+                          descriptors. The Configuration contains the resources
+                          for all the root bridges. The resource for each root
+                          bridge is terminated with END descriptor and an
+                          additional END is appended indicating the end of the
+                          entire resources. The resource descriptor field
+                          values follow the description in
+                          EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
+                          .SubmitResources().
+**/
+VOID
+EFIAPI
+PciHostBridgeResourceConflict (
+  EFI_HANDLE                        HostBridgeHandle,
+  VOID                              *Configuration
+  )
+{
+  EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;
+  UINTN                             RootBridgeIndex;
+  DEBUG ((DEBUG_ERROR, "PciHostBridge: Resource conflict happens!\n"));
+
+  RootBridgeIndex = 0;
+  Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;
+  while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {
+    DEBUG ((DEBUG_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));
+    for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {
+      ASSERT (Descriptor->ResType <
+              ARRAY_SIZE (mPciHostBridgeLibAcpiAddressSpaceTypeStr));
+      DEBUG ((DEBUG_ERROR, " %s: Length/Alignment = 0x%lx / 0x%lx\n",
+              mPciHostBridgeLibAcpiAddressSpaceTypeStr[Descriptor->ResType],
+              Descriptor->AddrLen, Descriptor->AddrRangeMax
+              ));
+      if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {
+        DEBUG ((DEBUG_ERROR, "     Granularity/SpecificFlag = %ld / %02x%s\n",
+                Descriptor->AddrSpaceGranularity, Descriptor->SpecificFlag,
+                ((Descriptor->SpecificFlag &
+                  EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE
+                  ) != 0) ? L" (Prefetchable)" : L""
+                ));
+      }
+    }
+    //
+    // Skip the END descriptor for root bridge
+    //
+    ASSERT (Descriptor->Desc == ACPI_END_TAG_DESCRIPTOR);
+    Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)(
+                   (EFI_ACPI_END_TAG_DESCRIPTOR *)Descriptor + 1
+                   );
+  }
+}
diff --git a/Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLib.inf b/Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLib.inf
new file mode 100644
index 000000000000..fc23b9486057
--- /dev/null
+++ b/Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLib.inf
@@ -0,0 +1,51 @@
+## @file
+#
+#  PCI Host Bridge Library instance for Bcm2711 ARM SOC
+#  Liberally borrowed from the SynQuacer
+#
+#  Copyright (c) 2019, Jeremy Linton
+#  Copyright (c) 2017, Linaro Ltd. All rights reserved.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010019
+  BASE_NAME                      = Bcm2711PciHostBridgeLib
+  FILE_GUID                      = 8d52c038-0040-11ea-83fb-5254005675a0
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PciHostBridgeLib|DXE_DRIVER
+  CONSTRUCTOR                    = Bcm2711PciHostBridgeLibConstructor
+
+#
+# The following information is for reference only and not required by the build
+# tools.
+#
+#  VALID_ARCHITECTURES           = ARM AARCH64
+#
+
+[Sources]
+  Bcm2711PciHostBridgeLib.c
+  Bcm2711PciHostBridgeLibConstructor.c
+
+[Packages]
+  ArmPkg/ArmPkg.dec
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  Silicon/Broadcom/Bcm27xx/Bcm27xx.dec
+
+[LibraryClasses]
+  ArmLib
+  DebugLib
+  DevicePathLib
+  MemoryAllocationLib
+  PcdLib
+  UefiBootServicesTableLib
+
+[FixedPcd]
+  gBcm27xxTokenSpaceGuid.PcdBcm27xxPciRegBase
+  gBcm27xxTokenSpaceGuid.PcdBcm27xxPciBusMmioAdr
+  gBcm27xxTokenSpaceGuid.PcdBcm27xxPciBusMmioLen
+  gBcm27xxTokenSpaceGuid.PcdBcm27xxPciCpuMmioAdr
diff --git a/Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLibConstructor.c b/Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLibConstructor.c
new file mode 100644
index 000000000000..90bbc3bf66c4
--- /dev/null
+++ b/Silicon/Broadcom/Bcm27xx/Library/Bcm2711PciHostBridgeLib/Bcm2711PciHostBridgeLibConstructor.c
@@ -0,0 +1,235 @@
+/** @file
+ *
+ * PCI Host Bridge Library instance for Bcm2711 ARM SOC
+ *
+ * Copyright (c) 2019, Jeremy Linton
+ * Copyright (c) 2017, Linaro Ltd. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause-Patent
+ *
+ * This module initializes the Pci as close to a standard
+ * PCI root complex as possible. The general information
+ * for this driver was sourced from.
+ *
+ * See https://github.com/raspberrypi/linux/blob/rpi-5.3.y/drivers/pci/controller/pcie-brcmstb.c
+ * and https://github.com/raspberrypi/linux/blob/rpi-5.3.y/arch/arm/boot/dts/bcm2838.dtsi
+ *
+ **/
+
+#include <IndustryStandard/Bcm2711.h>
+#include <IndustryStandard/Pci22.h>
+#include <Library/ArmLib.h>
+#include <Library/DebugLib.h>
+#include <Library/IoLib.h>
+#include <Library/PcdLib.h>
+#include <Library/PciHostBridgeLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <PiDxe.h>
+#include <Protocol/PciHostBridgeResourceAllocation.h>
+
+STATIC
+UINT32
+RdRegister (
+  UINT32                Offset
+  )
+{
+  EFI_PHYSICAL_ADDRESS  Base = PCIE_REG_BASE;
+
+  ArmDataMemoryBarrier ();
+
+  return MmioRead32 (Base + Offset);
+}
+
+
+STATIC
+VOID
+RMWRegister (
+  UINT32                Offset,
+  UINT32                Mask,
+  UINT32                In
+  )
+{
+  EFI_PHYSICAL_ADDRESS  Addr = PCIE_REG_BASE;
+  UINT32                Data = 0;
+  UINT32                Shift;
+
+  Addr += Offset;
+  Shift = 1;
+  if (In) {
+    while (!(Mask & Shift))
+      Shift <<= 1;
+    Data = (MmioRead32 (Addr) & ~Mask) | ((In * Shift) & Mask);
+  } else {
+    Data = MmioRead32 (Addr) & ~Mask;
+  }
+
+  MmioWrite32 (Addr, Data);
+
+  ArmDataMemoryBarrier ();
+}
+
+
+STATIC
+VOID
+WdRegister (
+  UINT32                Offset,
+  UINT32                In
+  )
+{
+  EFI_PHYSICAL_ADDRESS  Base = PCIE_REG_BASE;
+
+  MmioWrite32 (Base + Offset, In);
+
+  ArmDataMemoryBarrier ();
+}
+
+
+EFI_STATUS
+EFIAPI
+Bcm2711PciHostBridgeLibConstructor (
+  IN EFI_HANDLE       ImageHandle,
+  IN EFI_SYSTEM_TABLE *SystemTable
+  )
+{
+  INTN                  Timeout = 100;
+  UINT32                Data;
+  EFI_PHYSICAL_ADDRESS  TopOfPciMap;
+
+  DEBUG ((DEBUG_VERBOSE, "PCIe RootBridge constructor\n"));
+
+  // Reset controller
+  RMWRegister (PCIE_RGR1_SW_INIT_1, PCIE_RGR1_SW_INIT_1_INIT_MASK, 1);
+  // PERST
+  RMWRegister (PCIE_RGR1_SW_INIT_1, PCIE_RGR1_SW_INIT_1_PERST_MASK, 1);
+
+  gBS->Stall (1000);
+  // take the bridge out of reset
+  RMWRegister (PCIE_RGR1_SW_INIT_1, PCIE_RGR1_SW_INIT_1_INIT_MASK, 0);
+
+
+  RMWRegister (PCIE_MISC_HARD_PCIE_HARD_DEBUG,
+    PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK, 0);
+  RdRegister (PCIE_MISC_HARD_PCIE_HARD_DEBUG);
+  // Wait for SerDes to be stable
+  gBS->Stall (1000);
+
+  // Read revision
+  Data = RdRegister (PCIE_MISC_REVISION);
+  DEBUG ((DEBUG_INFO, "RootBridge: Revision %x\n", Data & PCIE_MISC_REVISION_MAJMIN_MASK));
+
+  RMWRegister (PCIE_MISC_MISC_CTRL, PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK, 1);
+  RMWRegister (PCIE_MISC_MISC_CTRL, PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK, 1);
+  RMWRegister (PCIE_MISC_MISC_CTRL, PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK, BURST_SIZE_128);
+
+  //
+  // "RC_BAR2" is the inbound TLP window.
+  // Having non RAM regions in the window is ok (and encouraged? for PtP?)
+  // so lets just map the entire address space.
+  //
+  // For regions > 64K then the pci->mem window size = log2(size)-15
+  // which is dumped into the low bits of the offset and written to
+  // the "LO" register with the high bits of the offset written into
+  // the "HI" part. The Linux driver makes the point that the offset
+  // must be aligned to its size aka a 1G region must start on a 1G
+  // boundary. The size parms are 1GB=0xf=log2(size)-15), or 4G=0x11
+  //
+
+  DEBUG ((DEBUG_VERBOSE, "RootBridge: Program bottom 4G of ram\n"));
+
+  // lets assume a start addr of 0, size 4G
+  WdRegister (PCIE_MISC_RC_BAR2_CONFIG_LO, 0x11);   /* Size = 4G */
+  WdRegister (PCIE_MISC_RC_BAR2_CONFIG_HI, 0);      /* Start at addr0 */
+  RMWRegister (PCIE_MISC_MISC_CTRL, PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK, 0x11);
+
+  // RC_BAR1 pcie->gisb disable
+  WdRegister (PCIE_MISC_RC_BAR1_CONFIG_LO, 0);
+  // RC_BAR3 pcie->scb disable
+  WdRegister (PCIE_MISC_RC_BAR3_CONFIG_LO, 0);
+
+  TopOfPciMap = PCIE_TOP_OF_MEM_WIN;
+
+  DEBUG ((DEBUG_VERBOSE, "RootBridge: MMIO PCIe addr %llx\n", TopOfPciMap));
+
+  //
+  // Setup the PCI side of the MMIO window.
+  //
+  // All the _WIN0_ values make one think there can be more than one
+  // mapping, which might mean it's possible to program a prefetchable
+  // window, or a PIO window...
+  //
+  WdRegister (PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO, TopOfPciMap);
+  WdRegister (PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI, TopOfPciMap >> 32);
+
+  //
+  // Set up the CPU MMIO addresses. The BASE_LIMIT register holds the
+  // bottom part of the start and end addresses in a 16-bit field (64k)
+  // aligned on a 1M boundary (aka only 12 bit active) the top 32-bits
+  // are then in their own registers. Further these address ranges are
+  // setup to match the Linux driver and seem less than ideal on the RPi
+  //
+  // The mapping should be 1:1 if possible
+  //
+  EFI_PHYSICAL_ADDRESS    CpuAddrStart = PCIE_CPU_MMIO_WINDOW;
+  EFI_PHYSICAL_ADDRESS    CpuAddrEnd   = CpuAddrStart + PCIE_BRIDGE_MMIO_LEN;
+
+  DEBUG ((DEBUG_VERBOSE, "RootBridge: MMIO CPU addr %llx\n", CpuAddrStart));
+
+  RMWRegister (PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT,
+    PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK, CpuAddrStart >> 20);
+  RMWRegister (PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT,
+    PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK, CpuAddrEnd >> 20);
+  RMWRegister (PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI,
+    PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK, CpuAddrStart >> 32);
+  RMWRegister (PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI,
+    PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK, CpuAddrEnd >> 32);
+
+  //
+  // Consider MSI setup here, not that it matters much its likely the legacy intX
+  // is as fast or faster...
+  //
+
+  // Clear and mask interrupts.
+  WdRegister (PCIE_INTR2_CPU_MASK_CLR, 0xffffffff);
+  WdRegister (PCIE_INTR2_CPU_MASK_SET, 0xffffffff);
+
+  // Set link cap & link ctl?
+  //RMWRegister (BRCM_PCIE_CAP_REGS+PCI_LNKCAP, LNKCAP, pen);
+  //RMWRegister (BRCM_PCIE_CTL_REGS+PCI_LNKCAP, LNKCAP, pen);
+
+  // De-assert PERST
+  RMWRegister (PCIE_RGR1_SW_INIT_1, PCIE_RGR1_SW_INIT_1_PERST_MASK, 0);
+  DEBUG ((DEBUG_VERBOSE, "RootBridge: Reset done\n"));
+
+  // Wait for linkup
+  do {
+      Data = RdRegister (PCIE_MISC_PCIE_STATUS);
+      gBS->Stall (1000);
+      Timeout --;
+  } while (((Data & 0x30) != 0x030) && (Timeout));
+  DEBUG ((DEBUG_VERBOSE, "PCIe link ready (status=%x) Timeout=%d\n", Data, Timeout));
+
+  if ((Data & 0x30) != 0x30) {
+    DEBUG ((DEBUG_ERROR, "PCIe link not ready (status=%x)\n", Data));
+    return EFI_DEVICE_ERROR;
+  }
+
+  if ((Data & 0x80) != 0x80) {
+    DEBUG ((DEBUG_ERROR, "PCIe link not in RC mode (status=%x)\n", Data));
+    return EFI_UNSUPPORTED;
+  }
+
+  // Change class code of the root port
+  RMWRegister(BRCM_PCIE_CLASS, PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK, 0x60400);
+
+  //
+  // PCIe->SCB endian mode for BAR
+  // field ENDIAN_MODE_BAR2 = little endian = 0
+  //
+  RMWRegister (PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1,
+    PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK, 0);
+
+  RMWRegister (PCIE_MISC_HARD_PCIE_HARD_DEBUG,
+    PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK, 1);
+
+  return EFI_SUCCESS;
+}
-- 
2.21.0.windows.1


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