intel/sch: Switch to MMCONF_SUPPORT_DEFAULT

Untested, only affected board is iwave/iwRainbowG6.

Change-Id: Ie3c40ede85c9f89b54804dd2a411645be93911bf
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17528
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/sch/Kconfig

@@ -25,6 +25,10 @@ config SOC_INTEL_SCH
 
 if SOC_INTEL_SCH
 
+config BOOTBLOCK_NORTHBRIDGE_INIT
+	string
+	default "soc/intel/sch/bootblock.c"
+
 config VGA_BIOS_ID
 	string
 	default "8086,8108"

src/soc/intel/sch/bootblock.c

@@ -0,0 +1,38 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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.
+ */
+
+#include <arch/io.h>
+
+/* Copy the bare minimum from port_access.c to enable MMCONF. */
+
+#define MSG_OPCODE_READ  0xD0000000
+#define MSG_OPCODE_WRITE 0xE0000000
+
+#define MCR 0xD0
+#define MDR 0xD4
+
+static void sch_port_access_write(int port, int reg, int bytes, long data)
+{
+	pci_io_write_config32(PCI_DEV(0, 0, 0), MDR, data);
+	pci_io_write_config32(PCI_DEV(0, 0, 0), MCR,
+			   (MSG_OPCODE_WRITE | (port << 16) | (reg << 8)));
+	pci_io_read_config32(PCI_DEV(0, 0, 0), MDR);
+}
+
+static void bootblock_northbridge_init(void)
+{
+	/* Enable PCI MMCONF decoding BAR. */
+	sch_port_access_write(0, 0, 4, DEFAULT_PCIEXBAR | 1); /* pre-b1 */
+	sch_port_access_write(2, 9, 4, DEFAULT_PCIEXBAR | 1); /* b1+ */
+}

src/soc/intel/sch/early_init.c

@@ -196,9 +196,6 @@ static void sch_setup_non_standard_bars(void)
 	/* Base of Stolen Memory Address 0x1080 size 64B */
 	pci_write_config32(PCI_DEV(0, 0x02, 0), 0x5C, 0x3F800000);
 
-	sch_port_access_write(0, 0, 4, DEFAULT_PCIEXBAR | 1); /* pre-b1 */
-	sch_port_access_write(2, 9, 4, DEFAULT_PCIEXBAR | 1); /* b1+ */
-
 	/* RCBA */
 	pci_write_config32(PCI_DEV(0, 0x1f, 0), 0xF0,
 			   ((uintptr_t)DEFAULT_RCBABASE | 1));