x86: acpi: Create a common irqlinks ASL file

Move the irqlinks.asl file currently in the BayTrail directory to
a common place to be shared among all x86 platforms. As the PIRQ
routing control programming interface is common to Intel chipsets,
leave the common part in the common file, and move the platform
specific part to the platform files.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/x86/include/asm/acpi/irqlinks.asl

@@ -7,26 +7,19 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
-Scope (\)
-{
-	/* Intel Legacy Block */
-	OperationRegion(ILBS, SystemMemory, ILB_BASE_ADDRESS, ILB_BASE_SIZE)
-	Field(ILBS, AnyAcc, NoLock, Preserve) {
-		Offset (0x8),
-		PRTA, 8,
-		PRTB, 8,
-		PRTC, 8,
-		PRTD, 8,
-		PRTE, 8,
-		PRTF, 8,
-		PRTG, 8,
-		PRTH, 8,
-		Offset (0x88),
-		    , 3,
-		UI3E, 1,
-		UI4E, 1
-	}
-}
+/*
+ * Intel chipset PIRQ routing control ASL description
+ *
+ * The programming interface is common to most Intel chipsets. But the PRTx
+ * registers may be mapped to different blocks. Some chipsets map them to LPC
+ * device (00:1f:00) PCI configuration space (like TunnelCreek, Quark), while
+ * some newer Atom SoCs (like BayTrail, Braswell) map them to Intel Legacy
+ * Block (ILB) memory space.
+ *
+ * This file defines 8 PCI IRQ link devices which corresponds to 8 PIRQ lines
+ * PIRQ A/B/C/D/E/F/G/H. To incorperate this file, the PRTx registers must be
+ * defined somewhere else in the platform's ASL files.
+ */
 
 Device (LNKA)
 {

arch/x86/include/asm/arch-baytrail/acpi/lpc.asl

@@ -10,6 +10,27 @@
 
 /* Intel LPC Bus Device - 0:1f.0 */
 
+Scope (\)
+{
+	/* Intel Legacy Block */
+	OperationRegion(ILBS, SystemMemory, ILB_BASE_ADDRESS, ILB_BASE_SIZE)
+	Field(ILBS, AnyAcc, NoLock, Preserve) {
+		Offset (0x8),
+		PRTA, 8,
+		PRTB, 8,
+		PRTC, 8,
+		PRTD, 8,
+		PRTE, 8,
+		PRTF, 8,
+		PRTG, 8,
+		PRTH, 8,
+		Offset (0x88),
+		    , 3,
+		UI3E, 1,
+		UI4E, 1
+	}
+}
+
 Device (LPCB)
 {
 	Name(_ADR, 0x001f0000)
@@ -23,7 +44,7 @@ Device (LPCB)
 		Offset(0x84)
 	}
 
-	#include "irqlinks.asl"
+	#include <asm/acpi/irqlinks.asl>
 
 	/* Firmware Hub */
 	Device (FWH)