mainboard/winnet/g170: Add ACPI support

What is present is APIC and legacy interrupt routing and the soft-off sleep
state. Other sleep states are missing, so are the SuperIO devices.

Boots Linux with and without "noapic" and a Windows XP (installed with
factory BIOS, the installer reportedly requires legacy keyboard).

Change-Id: Iee3ede8683d1ea51317228d4f782af27043cc945
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-on: https://review.coreboot.org/18901
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/mainboard/winnet/g170/Kconfig

@@ -24,6 +24,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select SUPERIO_WINBOND_W83697HF
 	select HAVE_PIRQ_TABLE
 	select HAVE_OPTION_TABLE
+	select HAVE_ACPI_TABLES
 	select BOARD_ROMSIZE_KB_512
 
 config MAINBOARD_DIR

src/mainboard/winnet/g170/acpi_tables.c

@@ -0,0 +1,51 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Based on mainboard/via/epia-m700/acpi_tables.c
+ *
+ * Copyright (C) 2004 Stefan Reinauer <stepan@openbios.org>
+ * Copyright (C) 2005 Nick Barker <nick.barker9@btinternet.com>
+ * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
+ * Copyright (C) 2017 Lubomir Rintel <lkundrak@v3.sk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdint.h>
+#include <arch/acpi.h>
+#include <arch/ioapic.h>
+#include <arch/smp/mpspec.h>
+
+#include "southbridge/via/vt8237r/vt8237r.h"
+
+unsigned long acpi_fill_mcfg(unsigned long current)
+{
+	return current;
+}
+
+unsigned long acpi_fill_madt(unsigned long current)
+{
+	/* Create all subtables for processors. */
+	current = acpi_create_madt_lapics(current);
+
+	/* Write SB IOAPIC. */
+	current += acpi_create_madt_ioapic((acpi_madt_ioapic_t *) current,
+				VT8237R_APIC_ID, IO_APIC_ADDR, 0);
+
+	/* IRQ9 ACPI active low. */
+	current += acpi_create_madt_irqoverride((acpi_madt_irqoverride_t *)
+		current, 0, 9, 9, MP_IRQ_TRIGGER_LEVEL | MP_IRQ_POLARITY_LOW);
+
+	/* IRQ0 -> APIC IRQ2. */
+	current += acpi_create_madt_irqoverride((acpi_madt_irqoverride_t *)
+						current, 0, 0, 2, 0x0);
+
+	return current;
+}

src/mainboard/winnet/g170/dsdt.asl

@@ -0,0 +1,43 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Lubomir Rintel <lkundrak@v3.sk>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+DefinitionBlock(
+	"dsdt.aml",
+	"DSDT",
+	0x02,		// DSDT revision: ACPI v2.0
+	"COREv4",	// OEM id
+	"COREBOOT",	// OEM table id
+	0x20170227	// OEM revision
+)
+{
+	/* Sleep states */
+	Name (\_S0, Package (0x04) { 0x00, 0x00, 0x00, 0x00 })
+	Name (\_S5, Package (0x04) { 0x02, 0x02, 0x02, 0x02 })
+
+	/* Interrupt model */
+	Method (_PIC, 1) {
+		Store (Arg0, \_SB.PCI0.ISAC.APIC)
+	}
+
+	Scope (\_SB) {
+		/* PCI bus */
+		Device (PCI0) {
+			#include <northbridge/via/cn700/acpi/hostbridge.asl>
+			#include <southbridge/via/vt8237r/acpi/lpc.asl>
+			#include <southbridge/via/vt8237r/acpi/default_irq_route.asl>
+		}
+	}
+}