intel/wifi: Include conditionally in the build

Keep this enabled by default as most x86 platforms could have PCI-e
slots equipped with one of these Intel WiFi adapters.

The Kconfig entries under google boards had no function previously,
the variable was never referenced.

Change-Id: I728ce3fd83d51d4e5e32b848a2079c5fcee29349
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/15931
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/drivers/intel/wifi/Kconfig

@@ -0,0 +1,6 @@
+config DRIVERS_INTEL_WIFI
+	bool "Support Intel PCI-e WiFi adapters"
+	default y if PCIEXP_PLUGIN_SUPPORT
+	help
+	   When enabled, add identifiers in ACPI and SMBIOS tables to
+	   make OS drivers work with certain Intel PCI-e WiFi chipsets.

src/drivers/intel/wifi/Makefile.inc

@@ -11,9 +11,4 @@
 # GNU General Public License for more details.
 #
 
-# really?
+ramstage-$(CONFIG_DRIVERS_INTEL_WIFI) += wifi.c
-ifeq ($(CONFIG_GENERATE_SMBIOS_TABLES),y)
-
-ramstage-$(CONFIG_PCIEXP_PLUGIN_SUPPORT) += wifi.c
-
-endif

src/drivers/intel/wifi/wifi.c

@@ -25,6 +25,7 @@
 #include <wrdd.h>
 #include "chip.h"
 
+#if IS_ENABLED(CONFIG_GENERATE_SMBIOS_TABLES)
 static int smbios_write_wifi(struct device *dev, int *handle,
 			     unsigned long *current)
 {
@@ -55,6 +56,7 @@ static int smbios_write_wifi(struct device *dev, int *handle,
 	*handle += 1;
 	return len;
 }
+#endif
 
 #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
 static void intel_wifi_fill_ssdt(struct device *dev)
@@ -125,7 +127,9 @@ struct device_operations device_ops = {
 	.set_resources            = pci_dev_set_resources,
 	.enable_resources         = pci_dev_enable_resources,
 	.init                     = pci_dev_init,
+#if IS_ENABLED(CONFIG_GENERATE_SMBIOS_TABLES)
 	.get_smbios_data          = smbios_write_wifi,
+#endif
 	.ops_pci                  = &pci_ops,
 #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
 	.acpi_name                = &intel_wifi_acpi_name,

src/mainboard/google/chell/Kconfig

@@ -28,9 +28,6 @@ config DRIVERS_I2C_GENERIC
 config DRIVERS_I2C_NAU8825
 	def_bool y
 
-config DRIVERS_INTEL_WIFI
-	def_bool y
-
 config IRQ_SLOT_COUNT
 	int
 	default 18

src/mainboard/google/glados/Kconfig

@@ -28,9 +28,6 @@ config DRIVERS_I2C_GENERIC
 config DRIVERS_I2C_NAU8825
 	def_bool y
 
-config DRIVERS_INTEL_WIFI
-	def_bool y
-
 config IRQ_SLOT_COUNT
 	int
 	default 18

src/mainboard/google/lars/Kconfig

@@ -32,9 +32,6 @@ config DRIVERS_I2C_GENERIC
 config DRIVERS_I2C_NAU8825
 	default y
 
-config DRIVERS_INTEL_WIFI
-	default y
-
 config IRQ_SLOT_COUNT
 	int
 	default 18

src/mainboard/intel/kunimitsu/Kconfig

@@ -31,9 +31,6 @@ config DRIVERS_I2C_GENERIC
 config DRIVERS_I2C_NAU8825
 	default y
 
-config DRIVERS_INTEL_WIFI
-	default y
-
 config IRQ_SLOT_COUNT
 	int
 	default 18