From 623caa537ff33c08aa8c242fb4b1d7e901f47e45 Mon Sep 17 00:00:00 2001
From: Cyril Chao <cyril.chao@mediatek.corp-partner.google.com>
Date: Sat, 29 Mar 2025 14:05:12 +0800
Subject: [PATCH] mb/google/skywalker: Add RT9123 support for beep sound

Derive the audio amplifier from FW_CONFIG, and set up I2S for RT9123.
Also pass the corresponding GPIO to the payload.

BUG=b:359705470
BRANCH=none
TEST=Build pass and test with Depthcahrge change:
https://chromium-review.googlesource.com/c/chromiumos/platform/depthcharge/+/6437675
https://chromium-review.googlesource.com/c/chromiumos/platform/depthcharge/+/6437676
Check audio cmd in depthcharge with:
firmware-shell: AUDIO CMD=audio 500 100 1

Signed-off-by: Cyril Chao <cyril.chao@mediatek.corp-partner.google.com>
Change-Id: I3b9b347ad8b754cbc02d942da9a7b0886c4c3cc4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87885
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yidi Lin <yidilin@google.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
---
 src/mainboard/google/skywalker/chromeos.c    |  9 ++++++
 src/mainboard/google/skywalker/devicetree.cb |  6 ++++
 src/mainboard/google/skywalker/gpio.h        |  4 +++
 src/mainboard/google/skywalker/mainboard.c   | 30 ++++++++++++++++++++
 4 files changed, 49 insertions(+)

diff --git a/src/mainboard/google/skywalker/chromeos.c b/src/mainboard/google/skywalker/chromeos.c
index 26f06442d9..9b5a9c0745 100644
--- a/src/mainboard/google/skywalker/chromeos.c
+++ b/src/mainboard/google/skywalker/chromeos.c
@@ -3,6 +3,7 @@
 #include <boot/coreboot_tables.h>
 #include <drivers/tpm/cr50.h>
 #include <ec/google/chromeec/ec.h>
+#include <fw_config.h>
 #include <gpio.h>
 
 #include "gpio.h"
@@ -31,6 +32,7 @@ void setup_chromeos_gpios(void)
 	gpio_output(GPIO_AP_FP_FW_UP_STRAP, 0);
 	gpio_output(GPIO_EN_PWR_FP, 0);
 	gpio_output(GPIO_FP_RST_1V8_S3_L, 0);
+	gpio_output(GPIO_EN_SPKR, 0);
 }
 
 void fill_lb_gpios(struct lb_gpios *gpios)
@@ -48,6 +50,13 @@ void fill_lb_gpios(struct lb_gpios *gpios)
 		};
 		lb_add_gpios(gpios, sd_card_gpios, ARRAY_SIZE(sd_card_gpios));
 	}
+
+	if (fw_config_probe(FW_CONFIG(AUDIO_AMP, AMP_RT9123))) {
+		struct lb_gpio rt9123_gpios[] = {
+			{GPIO_EN_SPKR.id, ACTIVE_HIGH, -1, "rt9123_spk_en"},
+		};
+		lb_add_gpios(gpios, rt9123_gpios, ARRAY_SIZE(rt9123_gpios));
+	}
 }
 
 int cr50_plat_irq_status(void)
diff --git a/src/mainboard/google/skywalker/devicetree.cb b/src/mainboard/google/skywalker/devicetree.cb
index c76b4e6141..6ec4e25c37 100644
--- a/src/mainboard/google/skywalker/devicetree.cb
+++ b/src/mainboard/google/skywalker/devicetree.cb
@@ -3,3 +3,9 @@
 chip soc/mediatek/mt8189
 	device cpu_cluster 0 on end
 end
+
+fw_config
+	field AUDIO_AMP 25 27
+		option AMP_RT9123 0
+	end
+end
diff --git a/src/mainboard/google/skywalker/gpio.h b/src/mainboard/google/skywalker/gpio.h
index 8a1925a635..208a3d9ef0 100644
--- a/src/mainboard/google/skywalker/gpio.h
+++ b/src/mainboard/google/skywalker/gpio.h
@@ -27,6 +27,10 @@
 #define GPIO_SD_CD_ODL			GPIO(GBE_INTR)
 #define GPIO_HDMI_HPD_1V8_ODL		GPIO(CONN_TOP_CLK)
 #define GPIO_AP_HDMI_RST_ODL		GPIO(GBE_TXC)
+#define GPIO_EN_SPKR			GPIO(GPIO05)
+#define GPIO_I2SOUT1_BCK		GPIO(DMIC0_DAT0)
+#define GPIO_I2SOUT1_LRCK		GPIO(DMIC1_CLK)
+#define GPIO_I2SOUT1_DOUT		GPIO(DMIC1_DAT0)
 
 void setup_chromeos_gpios(void);
 
diff --git a/src/mainboard/google/skywalker/mainboard.c b/src/mainboard/google/skywalker/mainboard.c
index 74c3ea715f..f6dc5cafa2 100644
--- a/src/mainboard/google/skywalker/mainboard.c
+++ b/src/mainboard/google/skywalker/mainboard.c
@@ -1,16 +1,45 @@
 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
 
 #include <device/device.h>
+#include <device/mmio.h>
+#include <fw_config.h>
 #include <gpio.h>
 #include <soc/bl31.h>
 #include <soc/dpm_v2.h>
 #include <soc/msdc.h>
 #include <soc/mt6359p.h>
+#include <soc/mtcmos.h>
 #include <soc/spm_common.h>
 #include <soc/usb.h>
 
 #include "gpio.h"
 
+#define AFE_SE_SECURE_CON1	(AUDIO_BASE + 0x5634)
+
+static void configure_rt9123(void)
+{
+	/* SoC I2S */
+	gpio_set_mode(GPIO_I2SOUT1_BCK, GPIO_FUNC(DMIC0_DAT0, I2SOUT1_BCK));
+	gpio_set_mode(GPIO_I2SOUT1_LRCK, GPIO_FUNC(DMIC1_CLK, I2SOUT1_LRCK));
+	gpio_set_mode(GPIO_I2SOUT1_DOUT, GPIO_FUNC(DMIC1_DAT0, I2SOUT1_DO));
+
+	printk(BIOS_INFO, "%s: AMP configuration done\n", __func__);
+}
+
+static void configure_audio(void)
+{
+	mtcmos_audio_power_on();
+	mtcmos_protect_audio_bus();
+
+	/* Switch to normal mode */
+	write32p(AFE_SE_SECURE_CON1, 0x0);
+
+	if (fw_config_probe(FW_CONFIG(AUDIO_AMP, AMP_RT9123)))
+		configure_rt9123();
+	else
+		printk(BIOS_WARNING, "Unknown amp\n");
+}
+
 static void power_on_fpmcu(void)
 {
 	/* Power on the fingerprint MCU */
@@ -24,6 +53,7 @@ static void mainboard_init(struct device *dev)
 	setup_usb_host();
 	spm_init();
 	power_on_fpmcu();
+	configure_audio();
 
 	if (CONFIG(SKYWALKER_SDCARD_INIT))
 		mtk_msdc_configure_sdcard();