mb/google/volteer: Add firmware configuration table

Add the current firmware configuration table for the volteer mainboard
and define some actions based on probe results for audio:

- When I2S options are selected disable the SoundWire GPIOs.
- When SoundWire is enabled disable the I2S GPIOs.
- When no audio is enabled disable all the GPIOs.

BUG=b:147462631
TEST=Test that GPIOs are configured as expected based on the current
value of the fw_config field in cbi.

Change-Id: I179f8b6436be83a2b37911777764bd26a0d404b7
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41215
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/volteer/Kconfig

@@ -15,6 +15,8 @@ config BOARD_GOOGLE_BASEBOARD_VOLTEER
 	select EC_GOOGLE_CHROMEEC_BOARDID
 	select EC_GOOGLE_CHROMEEC_SKUID
 	select EC_GOOGLE_CHROMEEC_LPC
+	select FW_CONFIG
+	select FW_CONFIG_SOURCE_CHROMEEC_CBI
 	select HAVE_ACPI_RESUME
 	select HAVE_ACPI_TABLES
 	select INTEL_LPSS_UART_FOR_CONSOLE

src/mainboard/google/volteer/Makefile.inc

@@ -8,6 +8,7 @@ romstage-y += romstage.c
 
 ramstage-$(CONFIG_CHROMEOS) += chromeos.c
 ramstage-y += ec.c
+ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
 ramstage-y += mainboard.c
 
 smm-y += smihandler.c

src/mainboard/google/volteer/fw_config.c

@@ -0,0 +1,82 @@
+/* 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_S4, NONE, DEEP, NF2),	/* DMIC_CLK1 */
+	PAD_CFG_NF(GPP_S5, NONE, DEEP, NF2),	/* DMIC_DATA1 */
+	PAD_CFG_NF(GPP_S6, NONE, DEEP, NF2),	/* DMIC_CLK0 */
+	PAD_CFG_NF(GPP_S7, NONE, DEEP, NF2),	/* DMIC_DATA0 */
+};
+
+static const struct pad_config dmic_disable_pads[] = {
+	PAD_NC(GPP_S4, NONE),
+	PAD_NC(GPP_S5, NONE),
+	PAD_NC(GPP_S6, NONE),
+	PAD_NC(GPP_S7, NONE),
+};
+
+static const struct pad_config sndw_enable_pads[] = {
+	PAD_CFG_NF(GPP_S0, NONE, DEEP, NF1),	/* SNDW0_CLK */
+	PAD_CFG_NF(GPP_S1, NONE, DEEP, NF1),	/* SNDW0_DATA */
+	PAD_CFG_NF(GPP_S2, NONE, DEEP, NF1),	/* SNDW1_CLK */
+	PAD_CFG_NF(GPP_S3, NONE, DEEP, NF1),	/* SNDW1_DATA */
+};
+
+static const struct pad_config sndw_disable_pads[] = {
+	PAD_NC(GPP_S0, NONE),
+	PAD_NC(GPP_S1, NONE),
+	PAD_NC(GPP_S2, NONE),
+	PAD_NC(GPP_S3, NONE),
+};
+
+static const struct pad_config i2s_enable_pads[] = {
+	PAD_CFG_NF(GPP_A23, NONE, DEEP, NF1),	/* I2S1_SCLK */
+	PAD_CFG_NF(GPP_D19, NONE, DEEP, NF1),	/* I2S_MCLK1 */
+	PAD_CFG_NF(GPP_R0, NONE, DEEP, NF2),	/* I2S0_SCLK */
+	PAD_CFG_NF(GPP_R1, NONE, DEEP, NF2),	/* I2S0_SFRM */
+	PAD_CFG_NF(GPP_R2, DN_20K, DEEP, NF2),	/* I2S0_TXD */
+	PAD_CFG_NF(GPP_R3, NONE, DEEP, NF2),	/* I2S0_RXD */
+	PAD_CFG_NF(GPP_R5, NONE, DEEP, NF2),	/* I2S1_RXD */
+	PAD_CFG_NF(GPP_R6, NONE, DEEP, NF2),	/* I2S1_TXD */
+	PAD_CFG_NF(GPP_R7, NONE, DEEP, NF2),	/* I2S1_SFRM */
+};
+
+static const struct pad_config i2s_disable_pads[] = {
+	PAD_NC(GPP_A23, NONE),
+	PAD_NC(GPP_D19, NONE),
+	PAD_NC(GPP_R0, NONE),
+	PAD_NC(GPP_R1, NONE),
+	PAD_NC(GPP_R2, DN_20K),
+	PAD_NC(GPP_R3, NONE),
+	PAD_NC(GPP_R5, NONE),
+	PAD_NC(GPP_R6, NONE),
+	PAD_NC(GPP_R7, NONE),
+};
+
+static void fw_config_handle(void *unused)
+{
+	if (fw_config_probe(FW_CONFIG(AUDIO, NONE))) {
+		printk(BIOS_INFO, "Configure GPIOs for no audio.\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(sndw_disable_pads, ARRAY_SIZE(sndw_disable_pads));
+	}
+	if (fw_config_probe(FW_CONFIG(AUDIO, MAX98373_ALC5682_SNDW))) {
+		printk(BIOS_INFO, "Configure GPIOs for SoundWire audio.\n");
+		gpio_configure_pads(sndw_enable_pads, ARRAY_SIZE(sndw_enable_pads));
+		gpio_configure_pads(dmic_enable_pads, ARRAY_SIZE(dmic_enable_pads));
+		gpio_configure_pads(i2s_disable_pads, ARRAY_SIZE(i2s_disable_pads));
+	}
+	if (fw_config_probe(FW_CONFIG(AUDIO, MAX98357_ALC5682I_I2S)) ||
+	    fw_config_probe(FW_CONFIG(AUDIO, MAX98373_ALC5682I_I2S))) {
+		printk(BIOS_INFO, "Configure GPIOs for I2S audio.\n");
+		gpio_configure_pads(i2s_enable_pads, ARRAY_SIZE(i2s_enable_pads));
+		gpio_configure_pads(dmic_enable_pads, ARRAY_SIZE(dmic_enable_pads));
+		gpio_configure_pads(sndw_disable_pads, ARRAY_SIZE(sndw_disable_pads));
+	}
+}
+BOOT_STATE_INIT_ENTRY(BS_DEV_ENABLE, BS_ON_ENTRY, fw_config_handle, NULL);

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

@@ -1,3 +1,26 @@
+fw_config
+	field USB_DB 0 3
+		option NONE 0
+		option USB4 1
+		option USB3 2
+	end
+	field THERMAL 4 7 end
+	field AUDIO 8 10
+		option NONE 0
+		option MAX98357_ALC5682I_I2S 1
+		option MAX98373_ALC5682I_I2S 2
+		option MAX98373_ALC5682_SNDW 3
+	end
+	field TABLETMODE 11
+		option DISABLED 0
+		option ENABLED 1
+	end
+	field LTE_DB 12
+		option ABSENT 0
+		option PRESENT 1
+	end
+end
+
 chip soc/intel/tigerlake
 
 	device cpu_cluster 0 on