drivers/i2c: add MAX98396 driver

Add MAX98396 support.

BUG=b:232606045
TEST=build passed.

Signed-off-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Change-Id: I835b51ea1fcc9363992d43a625f80cb545802fc6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66217
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

4 files changed, 131 insertions, 0 deletions

diff --git a/src/drivers/i2c/max98396/Kconfig b/src/drivers/i2c/max98396/Kconfig
new file mode 100644
index 0000000000..59f418f9e1
--- /dev/null
+++ b/src/drivers/i2c/max98396/Kconfig
@@ -0,0 +1,3 @@
+config DRIVERS_I2C_MAX98396
+	bool "Enable AMP MAX98396"
+	depends on HAVE_ACPI_TABLES
diff --git a/src/drivers/i2c/max98396/Makefile.inc b/src/drivers/i2c/max98396/Makefile.inc
new file mode 100644
index 0000000000..230f5d6d91
--- /dev/null
+++ b/src/drivers/i2c/max98396/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_DRIVERS_I2C_MAX98396) += max98396.c
diff --git a/src/drivers/i2c/max98396/chip.h b/src/drivers/i2c/max98396/chip.h
new file mode 100644
index 0000000000..63a2440acf
--- /dev/null
+++ b/src/drivers/i2c/max98396/chip.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * Maxim MAX98396 audio codec devicetree bindings
+ */
+
+#include <stdint.h>
+
+struct drivers_i2c_max98396_config {
+	/* I2C Bus Frequency in Hertz (default 400kHz) */
+	uint32_t bus_speed;
+	/* Identifier for chips */
+	uint32_t uid;
+	/* Device Description */
+	const char *desc;
+	/* ACPI Device Name */
+	const char *name;
+	/* slot number where voltage feedback will be received */
+	uint32_t vmon_slot_no;
+	/* slot number where current feedback will be received */
+	uint32_t imon_slot_no;
+	/* slot number of speaker DSP monitor  */
+	uint32_t spkfb_slot_no;
+	/* Use GPIO based reset gpio */
+	struct acpi_gpio reset_gpio;
+};
diff --git a/src/drivers/i2c/max98396/max98396.c b/src/drivers/i2c/max98396/max98396.c
new file mode 100644
index 0000000000..5288c4f4b1
--- /dev/null
+++ b/src/drivers/i2c/max98396/max98396.c
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi_device.h>
+#include <acpi/acpigen.h>
+#include <console/console.h>
+#include <device/i2c_simple.h>
+#include <device/device.h>
+#include <device/path.h>
+
+#include "chip.h"
+
+#define MAX98396_ACPI_HID "ADS8396"
+
+static void max98396_fill_ssdt(const struct device *dev)
+{
+	struct drivers_i2c_max98396_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 = config->bus_speed ? : I2C_SPEED_FAST,
+		.resource = scope,
+	};
+	struct acpi_dp *dp;
+	const char *path = acpi_device_path(dev);
+
+	if (!scope) {
+		printk(BIOS_ERR, "%s: dev not enabled\n", __func__);
+		return;
+	}
+
+	/* Device */
+	acpigen_write_scope(scope);
+	acpigen_write_device(acpi_device_name(dev));
+	acpigen_write_name_string("_HID", MAX98396_ACPI_HID);
+	acpigen_write_name_integer("_UID", config->uid);
+	if (config->desc)
+		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);
+	if (config->reset_gpio.pin_count)
+		acpi_device_write_gpio(&config->reset_gpio);
+	acpigen_write_resourcetemplate_footer();
+
+	/* Device Properties */
+	dp = acpi_dp_new_table("_DSD");
+
+	acpi_dp_add_integer(dp, "adi,vmon-slot-no", config->vmon_slot_no);
+	acpi_dp_add_integer(dp, "adi,imon-slot-no", config->imon_slot_no);
+	acpi_dp_add_integer(dp, "adi,spkfb-slot-no", config->spkfb_slot_no);
+	if (config->reset_gpio.pin_count)
+		acpi_dp_add_gpio(dp, "reset-gpios", path,
+				0,  /* Index = 0 */
+				0,  /* Pin = 0 */
+				config->reset_gpio.active_low);
+	acpi_dp_write(dp);
+
+	acpigen_write_device_end();
+	acpigen_write_scope_end();
+
+	printk(BIOS_INFO, "%s: %s address 0%xh\n", acpi_device_path(dev),
+		dev->chip_ops->name, dev->path.i2c.device);
+}
+
+static const char *max98396_acpi_name(const struct device *dev)
+{
+	struct drivers_i2c_max98396_config *config = dev->chip_info;
+	static char name[ACPI_NAME_BUFFER_SIZE];
+
+	if (config->name && strlen(config->name) == 4)
+		return config->name;
+
+	snprintf(name, sizeof(name), "D%03.3X", dev->path.i2c.device);
+	return name;
+}
+
+static struct device_operations max98396_ops = {
+	.read_resources		= noop_read_resources,
+	.set_resources		= noop_set_resources,
+	.acpi_name		= max98396_acpi_name,
+	.acpi_fill_ssdt		= max98396_fill_ssdt,
+};
+
+static void max98396_enable(struct device *dev)
+{
+	struct drivers_i2c_max98396_config *config = dev->chip_info;
+
+	dev->ops = &max98396_ops;
+
+	if (config->desc)
+		dev->name = config->desc;
+}
+
+struct chip_operations drivers_i2c_max98396_ops = {
+	CHIP_NAME("Maxim MAX98396 Codec")
+	.enable_dev = max98396_enable
+};