mb/google/skyrim: Configure WLAN

Configure PCIe Clk Source and Clk Request mapping. Configure GPIOs used
for WLAN.  Mappping derived from Skyrim schematic.

BUG=b:214412172
TEST=Builds

Signed-off-by: Jon Murphy <jpmurphy@google.com>
Change-Id: I16e35b443f741d366589fefb7fd21863369d1ec2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62165
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

src/mainboard/google/skyrim/Kconfig

@@ -20,6 +20,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select BOARD_ROMSIZE_KB_16384
 	select DRIVERS_I2C_GENERIC
 	select DRIVERS_I2C_HID
+	select DRIVERS_WIFI_GENERIC
 	select EC_GOOGLE_CHROMEEC
 	select EC_GOOGLE_CHROMEEC_ESPI
 	select ELOG

src/mainboard/google/skyrim/romstage.c

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/variants.h>
+#include <soc/platform_descriptors.h>
+
+void mb_pre_fspm(void)
+{
+	size_t base_num_gpios;
+	const struct soc_amd_gpio *base_gpios;
+
+	/* Initialize PCIe reset. */
+	variant_pcie_gpio_table(&base_gpios, &base_num_gpios);
+
+	gpio_configure_pads(base_gpios, base_num_gpios);
+}

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

@@ -1,5 +1,7 @@
 bootblock-y += gpio.c
 
+romstage-y += gpio.c
+
 ramstage-y += gpio.c
 
 smm-y += gpio.c

src/mainboard/google/skyrim/variants/baseboard/devicetree.cb

@@ -47,7 +47,12 @@ chip soc/amd/sabrina
 				device pnp 0c09.0 alias chrome_ec on end
 			end
 		end
-		device ref gpp_bridge_0 on end # WLAN
+		device ref gpp_bridge_0 on # WLAN
+			chip drivers/wifi/generic
+				register "wake" = "GEVENT_8"
+				device pci 00.0 on end
+			end
+		end
 		device ref gpp_bridge_1 on end # SD
 		device ref gpp_bridge_2 on end # WWAN
 		device ref gpp_bridge_3 on end # NVMe

src/mainboard/google/skyrim/variants/baseboard/gpio.c

@@ -155,16 +155,37 @@ static const struct soc_amd_gpio sleep_gpio_table[] = {
 	/* TODO: Fill sleep gpio configuration */
 };
 
-/* Early GPIO configuration in bootblock */
+/* GPIO configuration in bootblock */
 static const struct soc_amd_gpio bootblock_gpio_table[] = {
-	/* TODO: Fill bootblock gpio configuration */
+	/* Enable WLAN */
+	/* WLAN_DISABLE */
+	PAD_GPO(GPIO_21, LOW),
 };
 
 /* Early GPIO configuration */
 static const struct soc_amd_gpio early_gpio_table[] = {
-	/* TODO: Fill early gpio configuration */
+	/* WLAN_AUX_RESET_L (ACTIVE LOW) */
+	PAD_GPO(GPIO_7, LOW),
+	/* Power on WLAN */
+	/* EN_PP3300_WLAN */
+	PAD_GPO(GPIO_9, HIGH),
 };
 
+/* PCIE_RST needs to be brought high before FSP-M runs */
+static const struct soc_amd_gpio pcie_gpio_table[] = {
+	/* Deassert all AUX_RESET lines & PCIE_RST */
+	/* WLAN_AUX_RESET_L (ACTIVE LOW) */
+	PAD_GPO(GPIO_7, HIGH),
+	/* PCIE_RST0_L */
+	PAD_NFO(GPIO_26, PCIE_RST0_L, HIGH),
+};
+
+__weak void variant_pcie_gpio_table(const struct soc_amd_gpio **gpio, size_t *size)
+{
+	*size = ARRAY_SIZE(pcie_gpio_table);
+	*gpio = pcie_gpio_table;
+}
+
 __weak void variant_base_gpio_table(const struct soc_amd_gpio **gpio, size_t *size)
 {
 	*size = ARRAY_SIZE(base_gpio_table);

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

@@ -34,4 +34,7 @@ void variant_sleep_gpio_table(const struct soc_amd_gpio **gpio, size_t *size);
 /* This function provides GPIO settings for TPM i2c bus. */
 void variant_tpm_gpio_table(const struct soc_amd_gpio **gpio, size_t *size);
 
+/* This function provides GPIO settings before PCIe enumeration. */
+void variant_pcie_gpio_table(const struct soc_amd_gpio **gpio, size_t *size);
+
 #endif /* __BASEBOARD_VARIANTS_H__ */