src/include/nhlt.h

/*
 * This file is part of the coreboot project.
 *
 * Copyright 2015 Google, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef _NHLT_H_
#define _NHLT_H_

#include <stdint.h>
#include <stddef.h>

struct nhlt;
struct nhlt_endpoint;
struct nhlt_format;
struct nhlt_format_config;

/*
 * Non HD Audio ACPI support. This table is typically used for Intel Smart
 * Sound Technology DSP. It provides a way to encode opaque settings in
 * the ACPI tables.
 *
 * While the structure fields of the NHLT structs are exposed below
 * the SoC/chipset code should be the only other user manipulating the
 * fields directly aside from the library itself.
 *
 * The NHLT table consists of endpoints which in turn contain different
 * supporting stream formats. Each endpoint may contain a device specific
 * configuration payload as well as each stream format.
 *
 * Most code should use the SoC variants of the functions because
 * there is required logic needed to be performed by the SoC. The SoC
 * code should be abstracting the inner details of these functions that
 * specically apply to NHLT objects for that SoC.
 *
 * An example sequence:
 *
 * nhlt = nhlt_init()
 * ep = nhlt_add_endpoint()
 * nhlt_endpoint_append_config(ep)
 * nhlt_endpoint_add_formats(ep)
 * nhlt_soc_serialize()
 */

/* Obtain an nhlt object for adding endpoints. Returns NULL on error. */
struct nhlt *nhlt_init(void);

/* Return the size of the NHLT table including ACPI header. */
size_t nhlt_current_size(struct nhlt *nhlt);

/*
 * Helper functions for adding NHLT devices utilizing an nhlt_endp_descriptor
 * to drive the logic.
 */

struct nhlt_endp_descriptor {
	/* NHLT endpoint types. */
	int link;
	int device;
	int direction;
	uint16_t vid;
	uint16_t did;
	/* Optional endpoint specific configuration data. */
	const void *cfg;
	size_t cfg_size;
	/* Formats supported for endpoint. */
	const struct nhlt_format_config *formats;
	size_t num_formats;
};

/*
 * Add the number of endpoints described by each descriptor. The virtual bus
 * id for each descriptor is the default value of 0.
 * Returns < 0 on error, 0 on success.
 */
int nhlt_add_endpoints(struct nhlt *nhlt,
			const struct nhlt_endp_descriptor *epds,
			size_t num_epds);

/*
 * Add the number of endpoints associated with a single NHLT SSP instance id.
 * Each endpoint described in the endpoint descriptor array uses the provided
 * virtual bus id. Returns < 0 on error, 0 on success.
 */
int nhlt_add_ssp_endpoints(struct nhlt *nhlt, int virtual_bus_id,
		const struct nhlt_endp_descriptor *epds, size_t num_epds);

/*
 * Add endpoint to NHLT object. Returns NULL on error.
 *
 * generic nhlt_add_endpoint() is called by the SoC code to provide
 * the specific assumptions/uses for NHLT for that platform. All fields
 * are the NHLT enumerations found within this header file.
 */
struct nhlt_endpoint *nhlt_add_endpoint(struct nhlt *nhlt, int link_type,
					int device_type, int dir,
					uint16_t vid, uint16_t did);

/*
 * Append blob of configuration to the endpoint proper. Returns 0 on
 * success, < 0 on error. A copy of the configuration is made so any
 * resources pointed to by config can be freed after the call.
 */
int nhlt_endpoint_append_config(struct nhlt_endpoint *endpoint,
				const void *config, size_t config_sz);

/* Add a format type to the provided endpoint. Returns NULL on error. */
struct nhlt_format *nhlt_add_format(struct nhlt_endpoint *endpoint,
					int num_channels,
					int sample_freq_khz,
					int container_bits_per_sample,
					int valid_bits_per_sample,
					uint32_t speaker_mask);

/*
 * Append blob of configuration to the format proper. Returns 0 on
 * success, < 0 on error. A copy of the configuration is made so any
 * resources pointed to by config can be freed after the call.
 */
int nhlt_format_append_config(struct nhlt_format *format, const void *config,
				size_t config_sz);

/*
 * Add num_formats described by formats to the endpoint. This function
 * effectively wraps nhlt_add_format() and nhlt_format_config() using the
 * data found in each nhlt_format_config object. Returns 0 on success, < 0
 * on error.
 */
int nhlt_endpoint_add_formats(struct nhlt_endpoint *endpoint,
				const struct nhlt_format_config *formats,
				size_t num_formats);

/*
 * Increment the instance id for a given link type. This function is
 * used for marking a device being completely added to the NHLT object.
 * Subsequent endpoints added to the nhlt object with the same link type
 * will use incremented instance id.
 */
void nhlt_next_instance(struct nhlt *nhlt, int link_type);

/*
 * Serialize NHLT object to ACPI table. Take in the beginning address of where
 * the table will reside and return the address of the next ACPI table. On
 * error 0 will be returned. The NHLT object is no longer valid after this
 * function is called.
 */
uintptr_t nhlt_serialize(struct nhlt *nhlt, uintptr_t acpi_addr);

/*
 * Serialize NHLT object to ACPI table. Take in the beginning address of where
 * the table will reside oem_id and oem_table_id and return the address of the
 * next ACPI table. On error 0 will be returned. The NHLT object is no longer
 * valid after thisfunction is called.
 */
uintptr_t nhlt_serialize_oem_overrides(struct nhlt *nhlt, uintptr_t acpi_addr,
		const char *oem_id, const char *oem_table_id,
		uint32_t oem_revision);

/*
 * While very similar to nhlt_serialize() the SoC specific function allows
 * the chipset to perform any needed accounting work such as updating ACPI
 * field references for the serialized structure.
 */
uintptr_t nhlt_soc_serialize(struct nhlt *nhlt, uintptr_t acpi_addr);

/*
 * While very similar to nhlt_serialize_oem_overrides() the SoC specific
 * function allows the chipset to perform any needed accounting work such
 * as updating ACPI field references for the serialized structure.
 */
uintptr_t nhlt_soc_serialize_oem_overrides(struct nhlt *nhlt,
	uintptr_t acpi_addr, const char *oem_id, const char *oem_table_id,
	uint32_t oem_revision);

/* Link and device types. */
enum {
	NHLT_LINK_HDA,
	NHLT_LINK_DSP,
	NHLT_LINK_PDM,
	NHLT_LINK_SSP,
	NHLT_MAX_LINK_TYPES,
};

enum {
	NHLT_SSP_DEV_BT, /* Bluetooth */
	NHLT_SSP_DEV_MODEM,
	NHLT_SSP_DEV_FM,
	NHLT_SSP_DEV_RESERVED,
	NHLT_SSP_DEV_I2S = 4,
};

enum {
	NHLT_PDM_DEV,
};

/* Endpoint direction. */
enum {
	NHLT_DIR_RENDER,
	NHLT_DIR_CAPTURE,
	NHLT_DIR_BIDIRECTIONAL,
};

/* Channel Mask for an endpoint. While they are prefixed with 'SPEAKER' the
 * channel masks are also used for capture devices. */
enum {
	SPEAKER_FRONT_LEFT = 1 << 0,
	SPEAKER_FRONT_RIGHT = 1 << 1,
	SPEAKER_FRONT_CENTER = 1 << 2,
	SPEAKER_LOW_FREQUENCY = 1 << 3,
	SPEAKER_BACK_LEFT = 1 << 4,
	SPEAKER_BACK_RIGHT = 1 << 5,
	SPEAKER_FRONT_LEFT_OF_CENTER = 1 << 6,
	SPEAKER_FRONT_RIGHT_OF_CENTER = 1 << 7,
	SPEAKER_BACK_CENTER = 1 << 8,
	SPEAKER_SIDE_LEFT = 1 << 9,
	SPEAKER_SIDE_RIGHT = 1 << 10,
	SPEAKER_TOP_CENTER = 1 << 11,
	SPEAKER_TOP_FRONT_LEFT = 1 << 12,
	SPEAKER_TOP_FRONT_CENTER = 1 << 13,
	SPEAKER_TOP_FRONT_RIGHT = 1 << 14,
	SPEAKER_TOP_BACK_LEFT = 1 << 15,
	SPEAKER_TOP_BACK_CENTER = 1 << 16,
	SPEAKER_TOP_BACK_RIGHT = 1 << 17,
};


/* Supporting structures. Only SoC/chipset and the library code directly should
 * be manipulating these structures. */
struct sub_format {
	uint32_t data1;
	uint16_t data2;
	uint16_t data3;
	uint8_t data4[8];
};

struct nhlt_specific_config {
	uint32_t size;
	void *capabilities;
};

struct nhlt_waveform {
	uint16_t tag;
	uint16_t num_channels;
	uint32_t samples_per_second;
	uint32_t bytes_per_second;
	uint16_t block_align;
	uint16_t bits_per_sample;
	uint16_t extra_size;
	uint16_t valid_bits_per_sample;
	uint32_t channel_mask;
	struct sub_format sub_format;
};

struct nhlt_format {
	struct nhlt_waveform waveform;
	struct nhlt_specific_config config;
};

/*
 * This struct is used by nhlt_endpoint_add_formats() for easily adding
 * waveform formats with associated settings file.
 */
struct nhlt_format_config {
	int num_channels;
	int sample_freq_khz;
	int container_bits_per_sample;
	int valid_bits_per_sample;
	uint32_t speaker_mask;
	const char *settings_file;
};

/* Arbitrary max number of formats per endpoint. */
#define MAX_FORMATS 2
struct nhlt_endpoint {
	uint32_t length;
	uint8_t link_type;
	uint8_t instance_id;
	uint16_t vendor_id;
	uint16_t device_id;
	uint16_t revision_id;
	uint32_t subsystem_id;
	uint8_t device_type;
	uint8_t direction;
	uint8_t virtual_bus_id;
	struct nhlt_specific_config config;
	uint8_t num_formats;
	struct nhlt_format formats[MAX_FORMATS];
};

#define MAX_ENDPOINTS 8
struct nhlt {
	uint32_t subsystem_id;
	uint8_t num_endpoints;
	struct nhlt_endpoint endpoints[MAX_ENDPOINTS];
	uint8_t current_instance_id[NHLT_MAX_LINK_TYPES];
};

struct nhlt_tdm_config {
	uint8_t virtual_slot;
	uint8_t config_type;
};

enum {
	NHLT_TDM_BASIC,
	NHLT_TDM_MIC_ARRAY,
};

struct nhlt_dmic_array_config {
	struct nhlt_tdm_config tdm_config;
	uint8_t array_type;
};

/*
 * Microphone array definitions may be found here:
 * https://msdn.microsoft.com/en-us/library/windows/hardware/dn613960%28v=vs.85%29.aspx
 */
enum {
	NHLT_MIC_ARRAY_2CH_SMALL = 0xa,
	NHLT_MIC_ARRAY_2CH_BIG = 0xb,
	NHLT_MIC_ARRAY_4CH_1ST_GEOM = 0xc,
	NHLT_MIC_ARRAY_4CH_L_SHAPED = 0xd,
	NHLT_MIC_ARRAY_4CH_2ND_GEOM = 0xe,
	NHLT_MIC_ARRAY_VENDOR_DEFINED = 0xf,
};

#endif