4 files changed, 144 insertions, 0 deletions
diff --git a/src/drivers/i2c/rt5645/Kconfig b/src/drivers/i2c/rt5645/Kconfig
new file mode 100644
index 0000000000..76cfee8851
--- /dev/null
+++ b/src/drivers/i2c/rt5645/Kconfig
@@ -0,0 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+config DRIVERS_I2C_RT5645
+	bool
+	depends on HAVE_ACPI_TABLES
diff --git a/src/drivers/i2c/rt5645/Makefile.mk b/src/drivers/i2c/rt5645/Makefile.mk
new file mode 100644
index 0000000000..69d5f7e86b
--- /dev/null
+++ b/src/drivers/i2c/rt5645/Makefile.mk
@@ -0,0 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+ramstage-$(CONFIG_DRIVERS_I2C_RT5645) += rt5645.c
diff --git a/src/drivers/i2c/rt5645/chip.h b/src/drivers/i2c/rt5645/chip.h
new file mode 100644
index 0000000000..e8537ee6a8
--- /dev/null
+++ b/src/drivers/i2c/rt5645/chip.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi_device.h>
+
+struct drivers_i2c_rt5645_config {
+	const char *desc;	/* Device Description */
+	const char *name;	/* ACPI Device Name */
+	const char *hid;	/* ACPI _HID */
+	struct acpi_gpio cbj_sleeve;	/* sleeve power gate GPIO */
+	struct acpi_gpio hp_detect;
+	unsigned int uid;
+	unsigned int bus_speed;
+	/* Allow GPIO based interrupt or PIRQ */
+	struct acpi_gpio irq_gpio;
+	struct acpi_irq irq;
+	uint32_t jd_mode;
+};
diff --git a/src/drivers/i2c/rt5645/rt5645.c b/src/drivers/i2c/rt5645/rt5645.c
new file mode 100644
index 0000000000..28434ee456
--- /dev/null
+++ b/src/drivers/i2c/rt5645/rt5645.c
@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi_device.h>
+#include <acpi/acpigen.h>
+#include <console/console.h>
+#include <device/device.h>
+#include "chip.h"
+
+#define RT5645_ACPI_NAME	"RT58"
+#define RT5645_ACPI_HID		"10EC5650"
+
+#define RT5645_DP_INT(key, val) \
+	acpi_dp_add_integer(dp, "realtek," key, (val))
+
+static void rt5645_fill_ssdt(const struct device *dev)
+{
+	struct drivers_i2c_rt5645_config *config = dev->chip_info;
+	const char *path;
+	const char *scope = acpi_device_scope(dev);
+	int cbj_sleeve_index = -1, irq_gpio_index = -1, hp_detect_index = -1;
+	struct acpi_i2c i2c = {
+		.address = dev->path.i2c.device,
+		.mode_10bit = dev->path.i2c.mode_10bit,
+		.speed = config->bus_speed ? : I2C_SPEED_FAST,
+		.resource = scope,
+	};
+	struct acpi_dp *dp;
+	int curr_index = 0;
+
+	if (!config)
+		return;
+
+	const char *name = acpi_device_name(dev);
+	if (!scope || !name)
+		return;
+
+	/* Device */
+	acpigen_write_scope(scope);
+	acpigen_write_device(name);
+
+	if (config->hid)
+		acpigen_write_name_string("_HID", config->hid);
+	else
+		acpigen_write_name_string("_HID", RT5645_ACPI_HID);
+	acpigen_write_name_integer("_UID", 0);
+	if (config->desc)
+		acpigen_write_name_string("_DDN", config->desc);
+	/* Hide the device because of Microsoft Windows */
+	acpigen_write_STA(ACPI_STATUS_DEVICE_HIDDEN_ON);
+
+	/* Resources */
+	acpigen_write_name("_CRS");
+	acpigen_write_resourcetemplate_header();
+	acpi_device_write_i2c(&i2c);
+
+	/* Use either Interrupt() or GpioInt() */
+	if (config->irq_gpio.pin_count)
+		irq_gpio_index = acpi_device_write_dsd_gpio(&config->irq_gpio,
+							&curr_index);
+	else
+		acpi_device_write_interrupt(&config->irq);
+
+	/* Add I2C GPIO index  */
+	cbj_sleeve_index = acpi_device_write_dsd_gpio(&config->cbj_sleeve,
+							&curr_index);
+	hp_detect_index = acpi_device_write_dsd_gpio(&config->hp_detect,
+							&curr_index);
+	acpigen_write_resourcetemplate_footer();
+
+	/* _DSD for devicetree properties */
+	/* This points to the first pin in the first gpio entry in _CRS */
+	path = acpi_device_path(dev);
+	dp = acpi_dp_new_table("_DSD");
+	if (config->irq_gpio.pin_count)
+		acpi_dp_add_gpio(dp, "irq-gpios", path, irq_gpio_index, 0,
+			config->irq_gpio.active_low);
+	if (config->cbj_sleeve.pin_count)
+		acpi_dp_add_gpio(dp, "cbj-sleeve-gpios", path, cbj_sleeve_index, 0,
+			config->cbj_sleeve.active_low);
+	if (config->hp_detect.pin_count)
+		acpi_dp_add_gpio(dp, "hp-detect-gpios", path, hp_detect_index, 0,
+			config->hp_detect.active_low);
+	RT5645_DP_INT("jd-mode", config->jd_mode);
+	acpi_dp_write(dp);
+
+	acpigen_pop_len(); /* Device */
+	acpigen_pop_len(); /* Scope */
+
+	printk(BIOS_INFO, "%s: %s address 0%xh\n", path,
+		config->desc ? : dev->chip_ops->name, dev->path.i2c.device);
+}
+
+static const char *rt5645_acpi_name(const struct device *dev)
+{
+	struct drivers_i2c_rt5645_config *config = dev->chip_info;
+	static char name[5];
+	if (config->name)
+		return config->name;
+
+	snprintf(name, sizeof(name), "D%03.3X", dev->path.i2c.device);
+	return name;
+}
+
+static struct device_operations rt5645_ops = {
+	.read_resources		= noop_read_resources,
+	.set_resources		= noop_set_resources,
+	.acpi_name		= rt5645_acpi_name,
+	.acpi_fill_ssdt		= rt5645_fill_ssdt,
+};
+
+static void rt5645_enable(struct device *dev)
+{
+	dev->ops = &rt5645_ops;
+}
+
+struct chip_operations drivers_i2c_rt5645_ops = {
+	.name = "ASoC RT5645 Codec driver",
+	.enable_dev = rt5645_enable
+};