pci: Fix MMCONF_SUPPORT on non x86

Move x86 specific pci_bus_default_ops into arch/x86 folder.
Fixes compilation on platforms that do neither have MMCONF_SUPPORT
nor NO_MMCONF_SUPPORT (for example: all non-x86) but select PCI.

Change-Id: I0991ab00c9a56b23cd012dd2b8b861f9737a9e9c
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/25724
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/arch/x86/Makefile.inc

@@ -341,6 +341,7 @@ ramstage-y += memset.c
 ramstage-$(CONFIG_X86_TOP4G_BOOTMEDIA_MAP) += mmap_boot.c
 ramstage-$(CONFIG_GENERATE_MP_TABLE) += mpspec.c
 ramstage-y += pci_ops_conf1.c
+ramstage-y += pci_ops.c
 ramstage-$(CONFIG_MMCONF_SUPPORT) += pci_ops_mmconf.c
 ramstage-$(CONFIG_GENERATE_PIRQ_TABLE) += pirq_routing.c
 ramstage-y += rdrand.c

src/arch/x86/include/arch/pci_ops.h

@@ -19,8 +19,6 @@
 extern const struct pci_bus_operations pci_cf8_conf1;
 extern const struct pci_bus_operations pci_ops_mmconf;
 
-const struct pci_bus_operations *pci_bus_default_ops(device_t dev);
-
 #endif
 
 #endif /* ARCH_I386_PCI_OPS_H */

src/arch/x86/pci_ops.c

@@ -0,0 +1,25 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Facebook, Inc.
+ *
+ * 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 <device/device.h>
+#include <device/pci_ops.h>
+
+const struct pci_bus_operations *pci_bus_default_ops(struct device *dev)
+{
+	if (IS_ENABLED(CONFIG_NO_MMCONF_SUPPORT))
+		return &pci_cf8_conf1;
+
+	return &pci_ops_mmconf;
+}

src/device/pci_ops.c

@@ -20,12 +20,11 @@
 #include <device/pci_ids.h>
 #include <device/pci_ops.h>
 
-const struct pci_bus_operations *pci_bus_default_ops(device_t dev)
+/* Overwrite with architecture specific method */
+const struct pci_bus_operations __attribute__((weak))
+*pci_bus_default_ops(struct device *dev)
 {
-	if (IS_ENABLED(CONFIG_NO_MMCONF_SUPPORT))
-		return &pci_cf8_conf1;
-
-	return &pci_ops_mmconf;
+	return NULL;
 }
 
 static const struct pci_bus_operations *pci_bus_ops(struct bus *bus, struct device *dev)

src/include/device/pci_ops.h

@@ -73,4 +73,6 @@ void pci_update_config32(device_t dev, int reg, u32 mask, u32 or)
 	pci_write_config32(dev, reg, reg32);
 }
 
+const struct pci_bus_operations *pci_bus_default_ops(struct device *dev);
+
 #endif /* PCI_OPS_H */