4 files changed, 132 insertions, 0 deletions
diff --git a/src/drivers/i2c/max98390/Kconfig b/src/drivers/i2c/max98390/Kconfig
new file mode 100644
index 0000000000..7ea5589e9a
--- /dev/null
+++ b/src/drivers/i2c/max98390/Kconfig
@@ -0,0 +1,4 @@
+config DRIVERS_I2C_MAX98390
+	bool
+	default n
+	depends on HAVE_ACPI_TABLES
diff --git a/src/drivers/i2c/max98390/Makefile.inc b/src/drivers/i2c/max98390/Makefile.inc
new file mode 100644
index 0000000000..09ef81b9ea
--- /dev/null
+++ b/src/drivers/i2c/max98390/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_DRIVERS_I2C_MAX98390) += max98390.c
diff --git a/src/drivers/i2c/max98390/chip.h b/src/drivers/i2c/max98390/chip.h
new file mode 100644
index 0000000000..26cad4c728
--- /dev/null
+++ b/src/drivers/i2c/max98390/chip.h
@@ -0,0 +1,17 @@
+/* This file is part of the coreboot project. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/*
+ * MAXIM MAX98390 audio codec devicetree bindings
+ */
+
+struct drivers_i2c_max98390_config {
+	const char *name; /* ACPI Device Name */
+	const char *desc; /* Device Description */
+	unsigned int uid; /* ACPI _UID */
+
+	/* The VPD key of calibrated speaker resistance. */
+	const char *r0_calib_key;
+	/* The VPD key of temperature during speaker calibration. */
+	const char *temperature_calib_key;
+};
diff --git a/src/drivers/i2c/max98390/max98390.c b/src/drivers/i2c/max98390/max98390.c
new file mode 100644
index 0000000000..d2bb14fc8b
--- /dev/null
+++ b/src/drivers/i2c/max98390/max98390.c
@@ -0,0 +1,110 @@
+/* This file is part of the coreboot project. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <arch/acpi.h>
+#include <arch/acpi_device.h>
+#include <arch/acpigen.h>
+#include <console/console.h>
+#include <device/i2c.h>
+#include <device/device.h>
+#include <device/path.h>
+#include <stdint.h>
+#include <vendorcode/google/chromeos/chromeos.h>
+#include "chip.h"
+
+#define MAX98390_ACPI_HID "MX98390"
+
+#define MAX98390_DP_INT(key, val) acpi_dp_add_integer(dp, "maxim," key, (val))
+
+static void max98390_fill_ssdt(struct device *dev)
+{
+	struct drivers_i2c_max98390_config *config = dev->chip_info;
+	const char *scope = acpi_device_scope(dev);
+	struct acpi_i2c i2c = {
+		.address = dev->path.i2c.device,
+		.mode_10bit = dev->path.i2c.mode_10bit,
+		.speed = I2C_SPEED_FAST,
+		.resource = scope,
+	};
+	struct acpi_dp *dp;
+	uint64_t r0_value, temp_value;
+
+	if (!dev->enabled || !scope)
+		return;
+
+	/* Device */
+	acpigen_write_scope(scope);
+	acpigen_write_device(acpi_device_name(dev));
+	acpigen_write_name_string("_HID", MAX98390_ACPI_HID);
+	acpigen_write_name_integer("_UID", config->uid);
+	acpigen_write_name_string("_DDN", config->desc);
+	acpigen_write_STA(acpi_device_status(dev));
+
+	/* Resources */
+	acpigen_write_name("_CRS");
+	acpigen_write_resourcetemplate_header();
+	acpi_device_write_i2c(&i2c);
+	acpigen_write_resourcetemplate_footer();
+
+	/* Device Properties */
+	if (CONFIG(CHROMEOS_DSM_CALIB)) {
+		if (get_dsm_calibration_from_key(config->r0_calib_key, &r0_value)
+		    || get_dsm_calibration_from_key(config->temperature_calib_key,
+						    &temp_value)) {
+			printk(BIOS_ERR,
+			       "Failed to get dsm_calib parameters from VPD"
+			       " with key %s and %s\n",
+			       config->r0_calib_key, config->temperature_calib_key);
+		} else {
+			dp = acpi_dp_new_table("_DSD");
+			MAX98390_DP_INT("r0_calib", r0_value);
+			MAX98390_DP_INT("temperature_calib", temp_value);
+			acpi_dp_write(dp);
+			printk(BIOS_INFO, "set dsm_calib properties\n");
+		}
+	}
+
+	acpigen_pop_len(); /* Device */
+	acpigen_pop_len(); /* Scope */
+
+	printk(BIOS_INFO, "%s: %s address 0%xh\n", acpi_device_path(dev), dev->chip_ops->name,
+	       dev->path.i2c.device);
+}
+
+static const char *max98390_acpi_name(const struct device *dev)
+{
+	struct drivers_i2c_max98390_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 max98390_ops = {
+	.read_resources = noop_read_resources,
+	.set_resources = noop_set_resources,
+	.acpi_name = max98390_acpi_name,
+	.acpi_fill_ssdt_generator = max98390_fill_ssdt,
+};
+
+static void max98390_enable(struct device *dev)
+{
+	struct drivers_i2c_max98390_config *config = dev->chip_info;
+
+	if (!config)
+		return;
+
+	dev->ops = &max98390_ops;
+
+	/* Name the device as per description provided in devicetree */
+	if (config->desc)
+		dev->name = config->desc;
+}
+
+struct chip_operations drivers_i2c_max98390_ops = {
+	CHIP_NAME("Maxim MAX98390 Codec")
+	.enable_dev = max98390_enable
+};