mb/google/guybrush: Add helpers for cbi fw_config settings

Turn on CBI and add helper functions for determining the board
configuration from the firmware config settings in CBI.

BUG=b:187316460
TEST=Built

Signed-off-by: Martin Roth <martinroth@chromium.org>
Change-Id: I212e7f413b4d8a7d15122cde90100a0ec28e88a6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54639
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/guybrush/Kconfig

@@ -26,6 +26,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select ELOG
 	select ELOG_GSMI
 	select FW_CONFIG
+	select FW_CONFIG_SOURCE_CHROMEEC_CBI
 	select GOOGLE_SMBIOS_MAINBOARD_VERSION
 	select HAVE_ACPI_RESUME
 	select HAVE_EM100_SUPPORT

src/mainboard/google/guybrush/variants/baseboard/Makefile.inc

@@ -1,9 +1,11 @@
 bootblock-y += gpio.c
 bootblock-y += helpers.c
 
+romstage-y += helpers.c
 romstage-y += tpm_tis.c
 
 ramstage-y += gpio.c
+ramstage-y += helpers.c
 ramstage-y += tpm_tis.c
 
 verstage-y += gpio.c

src/mainboard/google/guybrush/variants/baseboard/helpers.c

@@ -2,11 +2,20 @@
 
 #include <baseboard/variants.h>
 #include <device/device.h>
+#include <fw_config.h>
 #include <soc/iomap.h>
+#include <soc/pci_devs.h>
 
-bool variant_has_fpmcu(void)
+static bool variant_has_device_enabled(const struct device_path *device_path, size_t path_length)
+{
+	const struct device *dev =
+		find_dev_nested_path(all_devices->link_list, device_path, path_length);
+
+	return is_dev_enabled(dev);
+}
+
+__weak bool variant_has_fpmcu(void)
 {
-	DEVTREE_CONST struct device *mmio_dev = NULL;
 	static const struct device_path fpmcu_path[] = {
 		{
 			.type = DEVICE_PATH_MMIO,
@@ -18,11 +27,18 @@ bool variant_has_fpmcu(void)
 			.generic.subid = 0
 		},
 	};
-	mmio_dev = find_dev_nested_path(
-		all_devices->link_list, fpmcu_path, ARRAY_SIZE(fpmcu_path));
 
-	if (mmio_dev == NULL)
-		return false;
-
-	return mmio_dev->enabled;
+	return variant_has_device_enabled(fpmcu_path, ARRAY_SIZE(fpmcu_path));
+}
+
+__weak bool variant_has_pcie_wwan(void)
+{
+	static const struct device_path pcie_wwan_path[] = {
+		{
+			.type = DEVICE_PATH_PCI,
+			.pci.devfn = PCIE_GPP_2_2_DEVFN,
+		},
+	};
+
+	return variant_has_device_enabled(pcie_wwan_path, ARRAY_SIZE(pcie_wwan_path));
 }

src/mainboard/google/guybrush/variants/baseboard/include/baseboard/variants.h

@@ -28,4 +28,6 @@ void variant_fpmcu_reset(void);
 
 bool variant_has_fpmcu(void);
 
+bool variant_has_pcie_wwan(void);
+
 #endif /* __BASEBOARD_VARIANTS_H__ */

src/mainboard/google/guybrush/variants/guybrush/overridetree.cb

@@ -33,6 +33,9 @@ end
 
 chip soc/amd/cezanne
 	device domain 0 on
+		device ref gpp_bridge_2 on
+			probe WWAN WWAN_FM350GL
+		end # WWAN
 	end # domain
 
 	register "slow_ppt_limit_mW"         = "25000"