sound: Add an ACPI driver for Dialog Semicondutor da7219

This chip is used on coral and we need to generate ACPI tables for sound
to make it work. Add a driver that does just this (i.e. at present does
not actually support playing sound).

Signed-off-by: Simon Glass <sjg@chromium.org>

3 files changed, 200 insertions, 0 deletions

diff --git a/drivers/sound/Kconfig b/drivers/sound/Kconfig
index 4ebc719..7f214b9 100644
--- a/drivers/sound/Kconfig
+++ b/drivers/sound/Kconfig
@@ -40,6 +40,15 @@ config I2S_SAMSUNG
 	  option provides an implementation for sound_init() and
 	  sound_play().
 
+config SOUND_DA7219
+	bool "Dialog Semiconductor audio codec"
+	depends on SOUND
+	help
+	  The DA7219 is an ultra-low-power audio codec with Advanced Accessory
+	  Detection (AAD). This driver only supports generation of ACPI tables.
+	  It does not support sound output or any of the other codec
+	  features.
+
 config SOUND_I8254
 	bool "Intel i8254 timer / beeper"
 	depends on SOUND
diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile
index 73ed7fe..8c3933a 100644
--- a/drivers/sound/Makefile
+++ b/drivers/sound/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_SOUND)	+= sound.o
 obj-$(CONFIG_SOUND)	+= codec-uclass.o
 obj-$(CONFIG_SOUND)	+= i2s-uclass.o
 obj-$(CONFIG_SOUND)	+= sound-uclass.o
+obj-$(CONFIG_SOUND_DA7219)	+= da7219.o
 obj-$(CONFIG_I2S_SAMSUNG)	+= samsung-i2s.o
 obj-$(CONFIG_SOUND_SANDBOX)	+= sandbox.o
 obj-$(CONFIG_I2S_ROCKCHIP)	+= rockchip_i2s.o rockchip_sound.o
diff --git a/drivers/sound/da7219.c b/drivers/sound/da7219.c
new file mode 100644
index 0000000..6bc1ad0
--- /dev/null
+++ b/drivers/sound/da7219.c
@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * ACPI driver for DA7219 codec
+ *
+ * Copyright 2019 Google LLC
+ * Parts taken from coreboot
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <irq.h>
+#include <log.h>
+#include <acpi/acpigen.h>
+#include <acpi/acpi_device.h>
+#include <acpi/acpi_dp.h>
+#ifdef CONFIG_X86
+#include <asm/acpi_nhlt.h>
+#endif
+#include <asm-generic/gpio.h>
+#include <dt-bindings/sound/nhlt.h>
+#include <dm/acpi.h>
+
+#define DA7219_ACPI_HID		"DLGS7219"
+
+static int da7219_acpi_fill_ssdt(const struct udevice *dev,
+				 struct acpi_ctx *ctx)
+{
+	char scope[ACPI_PATH_MAX];
+	char name[ACPI_NAME_MAX];
+	struct acpi_dp *dsd, *aad;
+	ofnode node;
+	u32 val;
+	int ret;
+
+	ret = acpi_device_scope(dev, scope, sizeof(scope));
+	if (ret)
+		return log_msg_ret("scope", ret);
+	ret = acpi_get_name(dev, name);
+	if (ret)
+		return log_msg_ret("name", ret);
+
+	/* Device */
+	acpigen_write_scope(ctx, scope);
+	acpigen_write_device(ctx, name);
+	acpigen_write_name_string(ctx, "_HID", DA7219_ACPI_HID);
+	acpigen_write_name_integer(ctx, "_UID", 1);
+	acpigen_write_name_string(ctx, "_DDN",
+				  dev_read_string(dev, "acpi,ddn"));
+	acpigen_write_name_integer(ctx, "_S0W", 4);
+	acpigen_write_sta(ctx, acpi_device_status(dev));
+
+	/* Resources */
+	acpigen_write_name(ctx, "_CRS");
+	acpigen_write_resourcetemplate_header(ctx);
+	ret = acpi_device_write_i2c_dev(ctx, dev);
+	if (ret)
+		return log_msg_ret("i2c", ret);
+
+	/* Use either Interrupt() or GpioInt() */
+	ret = acpi_device_write_interrupt_or_gpio(ctx, (struct udevice *)dev,
+						  "req-gpios");
+	if (ret)
+		return log_msg_ret("irq_gpio", ret);
+	acpigen_write_resourcetemplate_footer(ctx);
+
+	/* AAD Child Device Properties */
+	aad = acpi_dp_new_table("DAAD");
+	if (!aad)
+		return log_msg_ret("aad", -ENOMEM);
+
+	node = ofnode_find_subnode(dev_ofnode(dev), "da7219_aad");
+	if (!ofnode_valid(node))
+		return log_msg_ret("da7219_aad", -EINVAL);
+	acpi_dp_ofnode_copy_int(node, aad, "dlg,btn-cfg");
+	acpi_dp_ofnode_copy_int(node, aad, "dlg,mic-det-thr");
+	acpi_dp_ofnode_copy_int(node, aad, "dlg,jack-ins-deb");
+	acpi_dp_ofnode_copy_str(node, aad, "dlg,jack-det-rate");
+	acpi_dp_ofnode_copy_int(node, aad, "dlg,jack-rem-deb");
+	acpi_dp_ofnode_copy_int(node, aad, "dlg,a-d-btn-thr");
+	acpi_dp_ofnode_copy_int(node, aad, "dlg,d-b-btn-thr");
+	acpi_dp_ofnode_copy_int(node, aad, "dlg,b-c-btn-thr");
+	acpi_dp_ofnode_copy_int(node, aad, "dlg,c-mic-btn-thr");
+	acpi_dp_ofnode_copy_int(node, aad, "dlg,btn-avg");
+	acpi_dp_ofnode_copy_int(node, aad, "dlg,adc-1bit-rpt");
+	if (!ofnode_read_u32(node, "dlg,micbias-pulse-lvl", &val)) {
+		acpi_dp_ofnode_copy_int(node, aad, "dlg,micbias-pulse-lvl");
+		acpi_dp_ofnode_copy_int(node, aad, "dlg,micbias-pulse-time");
+	}
+
+	/* DA7219 Properties */
+	dsd = acpi_dp_new_table("_DSD");
+	if (!dsd)
+		return log_msg_ret("dsd", -ENOMEM);
+	acpi_dp_dev_copy_int(dev, dsd, "dlg,micbias-lvl");
+	acpi_dp_dev_copy_str(dev, dsd, "dlg,mic-amp-in-sel");
+	acpi_dp_dev_copy_str(dev, dsd, "dlg,mclk-name");
+	acpi_dp_add_child(dsd, "da7219_aad", aad);
+
+	/* Write Device Property Hierarchy */
+	acpi_dp_write(ctx, dsd);
+
+	acpigen_pop_len(ctx); /* Device */
+	acpigen_pop_len(ctx); /* Scope */
+
+	return 0;
+}
+
+/* For now only X86 boards support NHLT */
+#ifdef CONFIG_X86
+static const struct nhlt_format_config da7219_formats[] = {
+	/* 48 KHz 24-bits per sample. */
+	{
+		.num_channels = 2,
+		.sample_freq_khz = 48,
+		.container_bits_per_sample = 32,
+		.valid_bits_per_sample = 24,
+		.settings_file = "dialog-2ch-48khz-24b.dat",
+	},
+};
+
+static const struct nhlt_tdm_config tdm_config = {
+	.virtual_slot = 0,
+	.config_type = NHLT_TDM_BASIC,
+};
+
+static const struct nhlt_endp_descriptor da7219_descriptors[] = {
+	/* Render Endpoint */
+	{
+		.link = NHLT_LINK_SSP,
+		.device = NHLT_SSP_DEV_I2S,
+		.direction = NHLT_DIR_RENDER,
+		.vid = NHLT_VID,
+		.did = NHLT_DID_SSP,
+		.cfg = &tdm_config,
+		.cfg_size = sizeof(tdm_config),
+		.formats = da7219_formats,
+		.num_formats = ARRAY_SIZE(da7219_formats),
+	},
+	/* Capture Endpoint */
+	{
+		.link = NHLT_LINK_SSP,
+		.device = NHLT_SSP_DEV_I2S,
+		.direction = NHLT_DIR_CAPTURE,
+		.vid = NHLT_VID,
+		.did = NHLT_DID_SSP,
+		.cfg = &tdm_config,
+		.cfg_size = sizeof(tdm_config),
+		.formats = da7219_formats,
+		.num_formats = ARRAY_SIZE(da7219_formats),
+	},
+};
+
+static int da7219_acpi_setup_nhlt(const struct udevice *dev,
+				  struct acpi_ctx *ctx)
+{
+	u32 hwlink;
+	int ret;
+
+	if (dev_read_u32(dev, "acpi,audio-link", &hwlink))
+		return log_msg_ret("link", -EINVAL);
+
+	/* Virtual bus id of SSP links are the hardware port ids proper. */
+	ret = nhlt_add_ssp_endpoints(ctx->nhlt, hwlink, da7219_descriptors,
+				     ARRAY_SIZE(da7219_descriptors));
+	if (ret)
+		return log_msg_ret("add", ret);
+
+	return 0;
+}
+#endif
+
+struct acpi_ops da7219_acpi_ops = {
+	.fill_ssdt	= da7219_acpi_fill_ssdt,
+#ifdef CONFIG_X86
+	.setup_nhlt	= da7219_acpi_setup_nhlt,
+#endif
+};
+
+static const struct udevice_id da7219_ids[] = {
+	{ .compatible = "dlg,da7219" },
+	{ }
+};
+
+U_BOOT_DRIVER(da7219) = {
+	.name		= "da7219",
+	.id		= UCLASS_MISC,
+	.of_match	= da7219_ids,
+	ACPI_OPS_PTR(&da7219_acpi_ops)
+};