1 files changed, 77 insertions, 0 deletions
diff --git a/src/soc/intel/xeon_sp/cpx/acpi/iiostack.asl b/src/soc/intel/xeon_sp/cpx/acpi/iiostack.asl
new file mode 100644
index 0000000000..dca5569559
--- /dev/null
+++ b/src/soc/intel/xeon_sp/cpx/acpi/iiostack.asl
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#define MAKE_IIO_DEV(id,rt)						\
+	Device (PC##id)							\
+	{								\
+		Name (_HID, EisaId ("PNP0A08") /* PCI Express Bus */)	\
+		Name (_CID, EisaId ("PNP0A03") /* PCI Bus */)		\
+		Name (_UID, 0x##id)					\
+		Method (_PRT, 0, NotSerialized)				\
+		{							\
+			If (PICM)					\
+			{						\
+				Return (\_SB_.AR##rt)			\
+			}						\
+			Return (\_SB_.PR##rt)				\
+		}							\
+		External(\_SB.RT##id)					\
+		Method (_CRS, 0, NotSerialized)				\
+		{							\
+			Return (\_SB.RT##id)				\
+		}							\
+		Name (SUPP, 0x00)					\
+		Name (CTRL, 0x00)					\
+		Name (_PXM, 0x00)  /* _PXM: Device Proximity */		\
+		Method (_OSC, 4, NotSerialized)				\
+		{							\
+			CreateDWordField (Arg3, 0x00, CDW1)		\
+			If ((Arg0 == ToUUID ("33db4d5b-1ff7-401c-9657-7441c03dd766") /* PCI Host Bridge Device */))  \
+			{							\
+				CreateDWordField (Arg3, 0x04, CDW2)		\
+				If ((Arg2 > 0x02))				\
+				{						\
+					CreateDWordField (Arg3, 0x08, CDW3)	\
+				}						\
+				SUPP = CDW2					\
+				CTRL = CDW3					\
+				If ((AHPE || ((SUPP & 0x16) != 0x16)))		\
+				{						\
+					CTRL &= 0x1E				\
+					Sleep (0x03E8)				\
+				}						\
+				/* Never allow SHPC (no SHPC controller in system) */ \
+				CTRL &= 0x1D					\
+				/* Disable Native PCIe AER handling from OS */	\
+				CTRL &= 0x17					\
+				If ((Arg1 != One)) /* unknown revision */	\
+				{						\
+					CDW1 |= 0x08				\
+				}						\
+				If ((CDW3 != CTRL)) /* capabilities bits were masked */ \
+				{						\
+					CDW1 |= 0x10				\
+				}						\
+				CDW3 = CTRL					\
+				Return (Arg3)					\
+			}							\
+			Else							\
+			{							\
+				/* indicate unrecognized UUID */		\
+				CDW1 |= 0x04					\
+				IO80 = 0xEE					\
+				Return (Arg3)					\
+			}							\
+		}								\
+	}
+
+MAKE_IIO_DEV(00, 00)
+MAKE_IIO_DEV(01, 10)
+MAKE_IIO_DEV(02, 20)
+MAKE_IIO_DEV(03, 28)
+
+#if MAX_SOCKET > 1
+MAKE_IIO_DEV(06, 40)
+MAKE_IIO_DEV(07, 50)
+MAKE_IIO_DEV(08, 60)
+MAKE_IIO_DEV(09, 68)
+#endif