mb/google/brask/var/kuldax: add fw_config and enable BT offload

add fw_config probe for auido and enable BT offload support.

BUG=b:232419816 b:232419765
TEST=FW_NAME=kuldax emerge-brask coreboot

Signed-off-by: David Wu <david_wu@quanta.corp-partner.google.com>
Change-Id: Id58e48cc2510d0377040d86bb9dbbb45bec7d624
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64987
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Ren Kuo <ren.kuo@quanta.corp-partner.google.com>

src/mainboard/google/brya/variants/kuldax/Makefile.inc

@@ -4,3 +4,5 @@ bootblock-y += gpio.c
 romstage-y += gpio.c
 
 ramstage-y += gpio.c
+ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
+ramstage-$(CONFIG_FW_CONFIG) += variant.c

src/mainboard/google/brya/variants/kuldax/fw_config.c

@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <bootstate.h>
+#include <console/console.h>
+#include <fw_config.h>
+#include <gpio.h>
+
+static const struct pad_config dmic_enable_pads[] = {
+	PAD_CFG_NF(GPP_R6, NONE, DEEP, NF3),	/* DMIC_CLK1_R */
+	PAD_CFG_NF(GPP_R7, NONE, DEEP, NF3),	/* DMIC_DATA1_R */
+};
+
+static const struct pad_config dmic_disable_pads[] = {
+	PAD_NC(GPP_R6, NONE),
+	PAD_NC(GPP_R7, NONE),
+};
+
+static const struct pad_config i2s_enable_pads[] = {
+	PAD_CFG_NF(GPP_R0, NONE, DEEP, NF2),	/* I2S_HP_SCLK_R */
+	PAD_CFG_NF(GPP_R1, NONE, DEEP, NF2),	/* I2S_HP_SFRM_R */
+	PAD_CFG_NF(GPP_R2, DN_20K, DEEP, NF2),	/* I2S_PCH_TX_HP_RX_STRAP */
+	PAD_CFG_NF(GPP_R3, NONE, DEEP, NF2),	/* I2S_PCH_RX_HP_TX */
+};
+
+static const struct pad_config i2s_disable_pads[] = {
+	PAD_NC(GPP_R0, NONE),
+	PAD_NC(GPP_R1, NONE),
+	PAD_NC(GPP_R2, NONE),
+	PAD_NC(GPP_R3, NONE),
+};
+
+static const struct pad_config bt_i2s_enable_pads[] = {
+	PAD_CFG_NF(GPP_VGPIO_30, NONE, DEEP, NF3),	/* BT_I2S_BCLK */
+	PAD_CFG_NF(GPP_VGPIO_31, NONE, DEEP, NF3),	/* BT_I2S_SYNC */
+	PAD_CFG_NF(GPP_VGPIO_32, NONE, DEEP, NF3),	/* BT_I2S_SDO */
+	PAD_CFG_NF(GPP_VGPIO_33, NONE, DEEP, NF3),	/* BT_I2S_SDI */
+	PAD_CFG_NF(GPP_VGPIO_34, NONE, DEEP, NF1),	/* SSP2_SCLK */
+	PAD_CFG_NF(GPP_VGPIO_35, NONE, DEEP, NF1),	/* SSP2_SFRM */
+	PAD_CFG_NF(GPP_VGPIO_36, NONE, DEEP, NF1),	/* SSP_TXD */
+	PAD_CFG_NF(GPP_VGPIO_37, NONE, DEEP, NF1),	/* SSP_RXD */
+};
+
+static const struct pad_config bt_i2s_disable_pads[] = {
+	PAD_NC(GPP_VGPIO_30, NONE),
+	PAD_NC(GPP_VGPIO_31, NONE),
+	PAD_NC(GPP_VGPIO_32, NONE),
+	PAD_NC(GPP_VGPIO_33, NONE),
+	PAD_NC(GPP_VGPIO_34, NONE),
+	PAD_NC(GPP_VGPIO_35, NONE),
+	PAD_NC(GPP_VGPIO_36, NONE),
+	PAD_NC(GPP_VGPIO_37, NONE),
+};
+
+static void fw_config_handle(void *unused)
+{
+	if (!fw_config_is_provisioned() || fw_config_probe(FW_CONFIG(AUDIO, AUDIO_UNKNOWN))) {
+		printk(BIOS_INFO, "Disable audio related GPIO pins.\n");
+		gpio_configure_pads(i2s_disable_pads, ARRAY_SIZE(i2s_disable_pads));
+		gpio_configure_pads(dmic_disable_pads, ARRAY_SIZE(dmic_disable_pads));
+		gpio_configure_pads(bt_i2s_disable_pads, ARRAY_SIZE(bt_i2s_disable_pads));
+		return;
+	}
+
+	if (fw_config_probe(FW_CONFIG(AUDIO, NAU88L25B_I2S))) {
+		printk(BIOS_INFO, "Configure audio over I2S with NAU88L25B.\n");
+		gpio_configure_pads(dmic_enable_pads, ARRAY_SIZE(dmic_enable_pads));
+		gpio_configure_pads(i2s_enable_pads, ARRAY_SIZE(i2s_enable_pads));
+		printk(BIOS_INFO, "BT offload enabled\n");
+		gpio_configure_pads(bt_i2s_enable_pads, ARRAY_SIZE(bt_i2s_enable_pads));
+	} else {
+		printk(BIOS_INFO, "BT offload disabled\n");
+		gpio_configure_pads(bt_i2s_disable_pads, ARRAY_SIZE(bt_i2s_disable_pads));
+	}
+}
+BOOT_STATE_INIT_ENTRY(BS_DEV_ENABLE, BS_ON_ENTRY, fw_config_handle, NULL);

src/mainboard/google/brya/variants/kuldax/overridetree.cb

@@ -1,3 +1,10 @@
+fw_config
+	field AUDIO 0 2
+		option AUDIO_UNKNOWN	0
+		option NAU88L25B_I2S	1
+	end
+end
+
 chip soc/intel/alderlake
 	register "serial_io_gspi_mode" = "{
 		[PchSerialIoIndexGSPI0] = PchSerialIoDisabled,
@@ -126,7 +133,9 @@ chip soc/intel/alderlake
 				register "short_key_debounce" = "2"   # 100ms
 				register "jack_insert_debounce" = "7" # 512ms
 				register "jack_eject_debounce" = "7"  # 512ms
-				device i2c 1a on end
+				device i2c 1a on
+					probe AUDIO NAU88L25B_I2S
+				end
 			end
 		end
 		device ref pcie_rp7 on

src/mainboard/google/brya/variants/kuldax/variant.c

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <chip.h>
+#include <fw_config.h>
+#include <baseboard/variants.h>
+
+void variant_update_soc_chip_config(struct soc_intel_alderlake_config *config)
+{
+	config->cnvi_bt_audio_offload = fw_config_probe(FW_CONFIG(AUDIO,
+							NAU88L25B_I2S));
+}