Add a driver that describes the Secure96 mezzanine board, and exposes
both the information required to describe it to the OS using a DT overlay,
and to describe it to UEFI itself.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 Platform/96Boards/Secure96Dxe/Secure96.dts    |  85 ++++++++
 Platform/96Boards/Secure96Dxe/Secure96.h      |  26 +++
 Platform/96Boards/Secure96Dxe/Secure96Dxe.c   | 211 ++++++++++++++++++++
 Platform/96Boards/Secure96Dxe/Secure96Dxe.inf |  67 +++++++
 4 files changed, 389 insertions(+)

diff --git a/Platform/96Boards/Secure96Dxe/Secure96.dts b/Platform/96Boards/Secure96Dxe/Secure96.dts
new file mode 100644
index 000000000000..b56ce59985cc
--- /dev/null
+++ b/Platform/96Boards/Secure96Dxe/Secure96.dts
@@ -0,0 +1,85 @@
+/** @file
+ * Copyright (c) 2018, Linaro Limited. All rights reserved.
+ *
+ * This program and the accompanying materials are licensed and made
+ * available under the terms and conditions of the BSD License which
+ * accompanies this distribution.  The full text of the license may be
+ * found at http://opensource.org/licenses/bsd-license.php
+ *
+ * THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR
+ * IMPLIED.
+ */
+
+#include "Secure96.h"
+
+//
+// Define a placeholder value for the GPIO phandle property cells appearing
+// in this file. It is up to the driver code to discover the actual phandle
+// value from the platform device tree and patch the overlay DTB before it
+// can be applied.
+//
+#define GPIO_PARENT_PLACEHOLDER_PHANDLE     0x0
+
+/dts-v1/;
+/plugin/;
+
+/ {
+    fragment@0 {
+        target-path = "I2C_PARENT_PLACEHOLDER_STRING";
+        __overlay__ {
+            clock-frequency = <100000>;
+
+            ATSHA204A_DT_NODENAME {
+                compatible = "atmel,atsha204a";
+                reg = <ATSHA204A_SLAVE_ADDRESS>;
+            };
+
+            ATECC508A_DT_NODENAME {
+                compatible = "atmel,atecc508a";
+                reg = <ATECC508A_SLAVE_ADDRESS>;
+            };
+        };
+    };
+
+    fragment@1 {
+        target-path = "SPI_PARENT_PLACEHOLDER_STRING";
+        __overlay__ {
+            INFINEON_SLB9670_DT_NODENAME {
+                compatible = "infineon,slb9670";
+                reg = <INFINEON_SLB9670_SPI_CS>;
+                spi-max-frequency = <22500000>;
+            };
+        };
+    };
+
+    fragment@2 {
+        target-path = "/";
+        __overlay__ {
+            gpio-leds {
+                compatible = "gpio-leds";
+
+                secure96-u1 {
+                    gpios = <GPIO_PARENT_PLACEHOLDER_PHANDLE
+                             FixedPcdGet32 (PcdGpioPinG)
+                             FixedPcdGet32 (PcdGpioPolarity)>;
+                };
+                secure96-u2 {
+                    gpios = <GPIO_PARENT_PLACEHOLDER_PHANDLE
+                             FixedPcdGet32 (PcdGpioPinF)
+                             FixedPcdGet32 (PcdGpioPolarity)>;
+                };
+                secure96-u3 {
+                    gpios = <GPIO_PARENT_PLACEHOLDER_PHANDLE
+                             FixedPcdGet32 (PcdGpioPinI)
+                             FixedPcdGet32 (PcdGpioPolarity)>;
+                };
+                secure96-u4 {
+                    gpios = <GPIO_PARENT_PLACEHOLDER_PHANDLE
+                             FixedPcdGet32 (PcdGpioPinH)
+                             FixedPcdGet32 (PcdGpioPolarity)>;
+                };
+            };
+        };
+    };
+};
diff --git a/Platform/96Boards/Secure96Dxe/Secure96.h b/Platform/96Boards/Secure96Dxe/Secure96.h
new file mode 100644
index 000000000000..84b8aed13d1e
--- /dev/null
+++ b/Platform/96Boards/Secure96Dxe/Secure96.h
@@ -0,0 +1,26 @@
+/** @file
+
+  Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+**/
+
+#ifndef _SECURE96_H_
+#define _SECURE96_H_
+
+#define ATSHA204A_SLAVE_ADDRESS         0x60
+#define ATSHA204A_DT_NODENAME           atsha204a@60
+
+#define ATECC508A_SLAVE_ADDRESS         0x51
+#define ATECC508A_DT_NODENAME           atecc508a@51
+
+#define INFINEON_SLB9670_SPI_CS         0x0
+#define INFINEON_SLB9670_DT_NODENAME    tpm@0
+
+#endif // _SECURE96_H_
diff --git a/Platform/96Boards/Secure96Dxe/Secure96Dxe.c b/Platform/96Boards/Secure96Dxe/Secure96Dxe.c
new file mode 100644
index 000000000000..6c48d7c0b024
--- /dev/null
+++ b/Platform/96Boards/Secure96Dxe/Secure96Dxe.c
@@ -0,0 +1,211 @@
+/** @file
+  96boards Secure96 mezzanine board DXE driver.
+
+  Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+**/
+
+#include <PiDxe.h>
+#include <libfdt.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/DxeServicesLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+#include <Protocol/LsConnector.h>
+#include <Protocol/Mezzanine.h>
+
+#include "Secure96.h"
+
+STATIC CONST UINT32 mI2cAtmelSha204aSlaveAddress[] = {
+  ATSHA204A_SLAVE_ADDRESS,
+
+  //
+  // The Atmel AtSha204a has an annoying 'wake' mode where it will only wake
+  // up if SDA is held low for a certain amount of time. Attempting to access
+  // a device at address 0x0 at 100 kHz should be sufficient to create this
+  // wake condition, so add address 0x0 to the slave addresses.
+  //
+  0
+};
+
+STATIC CONST EFI_I2C_DEVICE mI2c0Devices[] = {
+  {
+    &gAtSha204aI2cDeviceGuid,                     // DeviceGuid
+    0,                                            // DeviceIndex
+    0,                                            // HardwareRevision
+    0,                                            // I2C bus configuration
+    ARRAY_SIZE (mI2cAtmelSha204aSlaveAddress),    // SlaveAddressCount
+    mI2cAtmelSha204aSlaveAddress                  // SlaveAddressArray
+  }
+};
+
+STATIC CONST CHAR8 mLedNodes[][46] = {
+  "/fragment@2/__overlay__/gpio-leds/secure96-u1",
+  "/fragment@2/__overlay__/gpio-leds/secure96-u2",
+  "/fragment@2/__overlay__/gpio-leds/secure96-u3",
+  "/fragment@2/__overlay__/gpio-leds/secure96-u4",
+};
+
+STATIC
+VOID
+SetOverlayFragmentTarget (
+  VOID            *Overlay,
+  CONST CHAR8     *NodeName,
+  CONST CHAR8     *Target
+  )
+{
+  INT32       Node;
+  INT32       Err;
+
+  Node = fdt_path_offset (Overlay, NodeName);
+  ASSERT (Node > 0);
+
+  Err = fdt_setprop (Overlay, Node, "target-path", Target,
+          AsciiStrLen (Target) + 1);
+  if (Err) {
+    DEBUG ((DEBUG_ERROR, "%a: fdt_setprop() failed - %a\n",
+      __FUNCTION__, fdt_strerror (Err)));
+  }
+}
+
+STATIC
+VOID
+FixupOverlay (
+  VOID        *Dtb,
+  VOID        *Overlay
+  )
+{
+  INT32       Node;
+  UINT32      GpioPhandle;
+  UINTN       Idx;
+  UINT32      *GpioProp;
+  INT32       Err;
+
+  //
+  // Set the correct GPIO phandle in the LED nodes
+  //
+  Node = fdt_path_offset (Dtb, FixedPcdGetPtr (PcdGpioParent));
+  ASSERT (Node > 0);
+
+  GpioPhandle = fdt_get_phandle (Dtb, Node);
+  if (!GpioPhandle) {
+    //
+    // Node has no phandle yet -> create one
+    //
+    GpioPhandle = 1 + fdt_get_max_phandle (Dtb);
+    ASSERT (GpioPhandle >= 1);
+
+    Err = fdt_setprop_u32 (Dtb, Node, "phandle", GpioPhandle);
+    if (Err) {
+      DEBUG ((DEBUG_ERROR,
+        "%a: fdt_setprop_u32(.., .., \"phandle\", 0x%x) failed - %a\n",
+        __FUNCTION__, GpioPhandle, fdt_strerror (Err)));
+    }
+  }
+
+  for (Idx = 0; Idx < ARRAY_SIZE (mLedNodes); Idx++) {
+    Node = fdt_path_offset (Overlay, mLedNodes[Idx]);
+    ASSERT (Node > 0);
+
+    GpioProp = fdt_getprop_w (Overlay, Node, "gpios", NULL);
+    ASSERT (GpioProp != NULL);
+
+    *GpioProp = cpu_to_fdt32 (GpioPhandle);
+  }
+
+  SetOverlayFragmentTarget (Overlay, "/fragment@0",
+    FixedPcdGetPtr (PcdI2c0Parent));
+
+  SetOverlayFragmentTarget (Overlay, "/fragment@1",
+    FixedPcdGetPtr (PcdSpiParent));
+}
+
+/**
+  Apply the mezzanine's DT overlay
+
+  @param[in]      This      Pointer to the MEZZANINE_PROTOCOL instance.
+  @param[in,out]  Dtb       Pointer to the device tree blob
+
+  @return   EFI_SUCCESS     Operation succeeded.
+  @return   other           An error has occurred.
+**/
+STATIC
+EFI_STATUS
+ApplyDeviceTreeOverlay (
+  IN      MEZZANINE_PROTOCOL    *This,
+  IN  OUT VOID                  *Dtb
+  )
+{
+  VOID            *Overlay;
+  UINTN           OverlaySize;
+  EFI_STATUS      Status;
+  INT32           Err;
+
+  //
+  // Load the raw overlay DTB image from the raw section of this FFS file.
+  //
+  Status = GetSectionFromFv (&gEfiCallerIdGuid,
+             EFI_SECTION_RAW, 0, &Overlay, &OverlaySize);
+  ASSERT_EFI_ERROR (Status);
+  if (EFI_ERROR (Status)) {
+    return EFI_NOT_FOUND;
+  }
+
+  //
+  // Fix up unresolved references in the overlay.
+  //
+  FixupOverlay (Dtb, Overlay);
+
+  //
+  // Merge the overlay with the DTB
+  //
+  Err = fdt_overlay_apply (Dtb, Overlay);
+  if (Err) {
+    DEBUG ((DEBUG_ERROR, "%a: fdt_overlay_apply() failed - %a\n",
+      __FUNCTION__, fdt_strerror (Err)));
+    return EFI_NOT_FOUND;
+  }
+
+  return EFI_SUCCESS;
+}
+
+STATIC MEZZANINE_PROTOCOL mMezzanine = {
+  ApplyDeviceTreeOverlay,
+  ARRAY_SIZE (mI2c0Devices),
+  0,
+  mI2c0Devices,
+  NULL,
+  NULL,
+};
+
+EFI_STATUS
+EFIAPI
+Secure96DxeEntryPoint (
+  IN EFI_HANDLE         ImageHandle,
+  IN EFI_SYSTEM_TABLE   *SystemTable
+  )
+{
+  EFI_STATUS              Status;
+  LS_CONNECTOR_PROTOCOL   *LsConnector;
+
+  Status = gBS->LocateProtocol (&g96BoardsLsConnectorProtocolGuid, NULL,
+                  (VOID **)&LsConnector);
+  ASSERT_EFI_ERROR (Status);
+
+  if (LsConnector->MezzanineType != MezzanineSecure96) {
+    return EFI_NOT_FOUND;
+  }
+
+  return gBS->InstallProtocolInterface (&ImageHandle,
+                &g96BoardsMezzanineProtocolGuid,
+                EFI_NATIVE_INTERFACE,
+                &mMezzanine);
+}
diff --git a/Platform/96Boards/Secure96Dxe/Secure96Dxe.inf b/Platform/96Boards/Secure96Dxe/Secure96Dxe.inf
new file mode 100644
index 000000000000..72dbf1314c15
--- /dev/null
+++ b/Platform/96Boards/Secure96Dxe/Secure96Dxe.inf
@@ -0,0 +1,67 @@
+## @file
+#
+#  Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
+#
+#  This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD License
+#  which accompanies this distribution.  The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001001A
+  BASE_NAME                      = Secure96Dxe
+  FILE_GUID                      = 31519ec4-65f1-4790-b223-aa9330dd75fd
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = Secure96DxeEntryPoint
+
+[Sources]
+  Secure96.dts
+  Secure96.h
+  Secure96Dxe.c
+
+[Packages]
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+  Platform/96Boards/96Boards.dec
+  Silicon/Atmel/AtSha204a/AtSha204a.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  DxeServicesLib
+  FdtLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+  UefiLib
+
+[Protocols]
+  g96BoardsLsConnectorProtocolGuid            ## CONSUMES
+  g96BoardsMezzanineProtocolGuid              ## PRODUCES
+
+[Guids]
+  gAtSha204aI2cDeviceGuid
+  gFdtTableGuid
+
+[FixedPcd]
+  g96BoardsTokenSpaceGuid.PcdGpioParent
+  g96BoardsTokenSpaceGuid.PcdGpioPinF
+  g96BoardsTokenSpaceGuid.PcdGpioPinG
+  g96BoardsTokenSpaceGuid.PcdGpioPinH
+  g96BoardsTokenSpaceGuid.PcdGpioPinI
+  g96BoardsTokenSpaceGuid.PcdGpioPolarity
+  g96BoardsTokenSpaceGuid.PcdI2c0Parent
+  g96BoardsTokenSpaceGuid.PcdSpiParent
+
+[Depex]
+  g96BoardsLsConnectorProtocolGuid
+
+[BuildOptions]
+  # dtc emits lots of spurious warnings for overlays
+  *_*_*_DTC_FLAGS = -q
-- 
2.11.0

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