From 5665bcac4f3f2d101537f751fd3d2baa66afaafc Mon Sep 17 00:00:00 2001
From: Sean Rhodes <sean@starlabs.systems>
Date: Thu, 29 Aug 2024 20:19:39 +0100
Subject: drivers/usb/acpi: Add DSM for Intel Bluetooth

Add support for creating a DSM Method for Intel Bluetooth that
is outlined in Intel's connectivity integrated guide (which has
no document number).

It supports two GUIDs:

Set Tile Activaction (2d19d3e1-5708-4696-bd5b-2c3dbae2d6a9)
BIT(0)  Indicates whether the device supports other functions
BIT(1)  Set Tile Activation

Check/Set Reset Delay (aa10f4e0-81ac-4233-abf6-3b2ac50e28d9)
BIT(0)  Indicates whether the device supports other functions
BIT(1)  Set Bluetooth reset timing

Change-Id: Icc18f867604876b27ced2ee4356e47b3aa6b4f74
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84133
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 src/drivers/usb/acpi/chip.h     |   3 +
 src/drivers/usb/acpi/usb_acpi.c | 126 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 129 insertions(+)

diff --git a/src/drivers/usb/acpi/chip.h b/src/drivers/usb/acpi/chip.h
index 9acd382c3d..855a5d798b 100644
--- a/src/drivers/usb/acpi/chip.h
+++ b/src/drivers/usb/acpi/chip.h
@@ -47,6 +47,9 @@ struct drivers_usb_acpi_config {
 	/* Does the device have a power resource? */
 	bool has_power_resource;
 
+	/* Intel Bluetooth */
+	bool is_intel_bluetooth;
+
 	/* GPIO used to take device out of reset or to put it into reset. */
 	struct acpi_gpio reset_gpio;
 	/* Delay to be inserted after device is taken out of reset. */
diff --git a/src/drivers/usb/acpi/usb_acpi.c b/src/drivers/usb/acpi/usb_acpi.c
index 569147abad..b01c9492b3 100644
--- a/src/drivers/usb/acpi/usb_acpi.c
+++ b/src/drivers/usb/acpi/usb_acpi.c
@@ -8,6 +8,129 @@
 #include <device/device.h>
 #include "chip.h"
 
+/*
+ * Intel Bluetooth DSM
+ *
+ * Check Tile Activation (2d19d3e1-5708-4696-bd5b-2c3dbae2d6a9)
+ *
+ * Arg2 == 0: Return a package with the following bits set
+ * BIT(0)	Indicates whether the device supports other functions
+ * BIT(1)	Check Tile Activation
+ *
+ * Check/Set Reset Delay (aa10f4e0-81ac-4233-abf6-3b2ac50e28d9)
+ * Arg2 == 0: Return a package with the following bit set
+ * BIT(0)	Indicates whether the device supports other functions
+ * BIT(1)	Check Bluetooth reset timing
+ * Arg2 == 1: Set the reset delay based on Arg3
+ */
+
+static void check_reset_delay(void *arg)
+{
+	acpigen_write_if_lequal_op_int(ARG1_OP, 0);
+	{
+		acpigen_write_return_singleton_buffer(0x03);
+	}
+	acpigen_write_else();
+	{
+		acpigen_write_return_singleton_buffer(0x00);
+	}
+	acpigen_pop_len();
+}
+
+static void set_reset_delay(void *arg)
+{
+	acpigen_write_store_op_to_namestr(ARG3_OP, "RDLY");
+}
+
+static void get_feature_flag(void *arg)
+{
+	acpigen_write_if_lequal_op_int(ARG1_OP, 0);
+	{
+		acpigen_write_return_singleton_buffer(0x03);
+	}
+	acpigen_write_else();
+	{
+		acpigen_write_return_singleton_buffer(0x00);
+	}
+	acpigen_pop_len();
+}
+
+void (*uuid_callbacks1[])(void *) = { check_reset_delay, set_reset_delay };
+void (*uuid_callbacks2[])(void *) = { get_feature_flag };
+
+static void acpi_device_intel_bt(void)
+{
+/*
+ *	Name (RDLY, 0x69)
+ */
+	acpigen_write_name_integer("RDLY", 0x69);
+
+/*
+ *	Method (_DSM, 4, Serialized)
+ *	{
+ *		If ((Arg0 == ToUUID ("aa10f4e0-81ac-4233-abf6-3b2ac50e28d9")))
+ *		{
+ *			If ((Arg2 == Zero))
+ *			{
+ *				If ((Arg1 == Zero))
+ *				{
+ *					Return (Buffer (One)
+ *					{
+ *						0x03
+ *					})
+ *				}
+ *				Else
+ *				{
+ *					Return (Buffer (One)
+ *					{
+ *						0x00
+ *					})
+ *				}
+ *			}
+ *			If ((Arg2 == One))
+ *			{
+ *				RDLY = Arg3
+ *			}
+ *			Return (Zero)
+ *		}
+ *		ElseIf ((Arg0 == ToUUID ("2d19d3e1-5708-4696-bd5b-2c3dbae2d6a9")))
+ *		{
+ *			If ((Arg2 == Zero))
+ *			{
+ *				If ((Arg1 == Zero))
+ *				{
+ *					Return (Buffer (One)
+ *					{
+ *						0x00
+ *					})
+ *				}
+ *				Else
+ *				{
+ *					Return (Buffer (One)
+ *					{
+ *						0x00
+ *					})
+ *				}
+ *			}
+ *			Return (Zero)
+ *		}
+ *		Else
+ *		{
+ *			Return (Buffer (One)
+ *			{
+ *				0x00
+ *			})
+ *		}
+ *	}
+ */
+	struct dsm_uuid uuid_callbacks[] = {
+		DSM_UUID("aa10f4e0-81ac-4233-abf6-3b2ac50e28d9", uuid_callbacks1, 2, NULL),
+		DSM_UUID("2d19d3e1-5708-4696-bd5b-2c3dbae2d6a9", uuid_callbacks2, 1, NULL),
+	};
+
+	acpigen_write_dsm_uuid_arr(uuid_callbacks, ARRAY_SIZE(uuid_callbacks));
+}
+
 static bool usb_acpi_add_gpios_to_crs(struct drivers_usb_acpi_config *cfg)
 {
 	if (cfg->privacy_gpio.pin_count)
@@ -107,6 +230,9 @@ static void usb_acpi_fill_ssdt_generator(const struct device *dev)
 		acpi_device_add_power_res(&power_res_params);
 	}
 
+	if (config->is_intel_bluetooth)
+		acpi_device_intel_bt();
+
 	acpigen_pop_len();
 
 	printk(BIOS_INFO, "%s: %s at %s\n", path,
-- 
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