system76-coreboot/src/lib/nhlt.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <acpi/acpi.h>
#include <cbfs.h>
#include <commonlib/endian.h>
#include <console/console.h>
#include <nhlt.h>
#include <stdlib.h>
#include <string.h>

#define NHLT_RID 1
#define NHLT_SSID 1
#define WAVEFORMAT_TAG 0xfffe
#define DEFAULT_VIRTUAL_BUS_ID 0

static const struct sub_format pcm_subformat = {
	.data1 = 0x00000001,
	.data2 = 0x0000,
	.data3 = 0x0010,
	.data4 = { 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 },
};

struct nhlt *nhlt_init(void)
{
	struct nhlt *nhlt;

	nhlt = malloc(sizeof(*nhlt));

	if (nhlt == NULL)
		return NULL;

	memset(nhlt, 0, sizeof(*nhlt));
	nhlt->subsystem_id = NHLT_SSID;

	return nhlt;
}

struct nhlt_endpoint *nhlt_add_endpoint(struct nhlt *nhlt, int link_type,
					int device_type, int dir,
					uint16_t vid, uint16_t did)
{
	struct nhlt_endpoint *endp;

	if (link_type < NHLT_LINK_HDA || link_type >= NHLT_MAX_LINK_TYPES)
		return NULL;

	if (nhlt->num_endpoints >= MAX_ENDPOINTS)
		return NULL;

	endp = &nhlt->endpoints[nhlt->num_endpoints];

	endp->link_type = link_type;
	endp->instance_id = nhlt->current_instance_id[link_type];
	endp->vendor_id = vid;
	endp->device_id = did;
	endp->revision_id = NHLT_RID;
	endp->subsystem_id = nhlt->subsystem_id;
	endp->device_type = device_type;
	endp->direction = dir;
	endp->virtual_bus_id = DEFAULT_VIRTUAL_BUS_ID;

	nhlt->num_endpoints++;

	return endp;
}

static int append_specific_config(struct nhlt_specific_config *spec_cfg,
					const void *config, size_t config_sz)
{
	size_t new_sz;
	void *new_cfg;

	if (config == NULL || config_sz == 0)
		return 0;

	new_sz = spec_cfg->size + config_sz;

	new_cfg = malloc(new_sz);

	if (new_cfg == NULL)
		return -1;

	/* Append new config. */
	memcpy(new_cfg, spec_cfg->capabilities, spec_cfg->size);
	memcpy(new_cfg + spec_cfg->size, config, config_sz);

	free(spec_cfg->capabilities);

	/* Update with new config data. */
	spec_cfg->size = new_sz;
	spec_cfg->capabilities = new_cfg;

	return 0;
}

int nhlt_endpoint_append_config(struct nhlt_endpoint *endp, const void *config,
				size_t config_sz)
{
	return append_specific_config(&endp->config, config, config_sz);
}

struct nhlt_format *nhlt_add_format(struct nhlt_endpoint *endp,
					int num_channels,
					int sample_freq_khz,
					int container_bits_per_sample,
					int valid_bits_per_sample,
					uint32_t speaker_mask)
{
	struct nhlt_format *fmt;
	struct nhlt_waveform *wave;

	if (endp->num_formats >= MAX_FORMATS)
		return NULL;

	fmt = &endp->formats[endp->num_formats];
	wave = &fmt->waveform;

	wave->tag = WAVEFORMAT_TAG;
	wave->num_channels = num_channels;
	wave->samples_per_second = sample_freq_khz * KHz;
	wave->bits_per_sample = container_bits_per_sample;
	wave->extra_size = sizeof(wave->valid_bits_per_sample);
	wave->extra_size += sizeof(wave->channel_mask);
	wave->extra_size += sizeof(wave->sub_format);
	wave->valid_bits_per_sample = valid_bits_per_sample;
	wave->channel_mask = speaker_mask;
	memcpy(&wave->sub_format, &pcm_subformat, sizeof(wave->sub_format));

	/* Calculate the derived fields. */
	wave->block_align = wave->num_channels * wave->bits_per_sample / 8;
	wave->bytes_per_second = wave->block_align * wave->samples_per_second;

	endp->num_formats++;

	return fmt;
}

int nhlt_format_append_config(struct nhlt_format *fmt, const void *config,
				size_t config_sz)
{
	return append_specific_config(&fmt->config, config, config_sz);
}

int nhlt_endpoint_add_formats(struct nhlt_endpoint *endp,
				const struct nhlt_format_config *formats,
				size_t num_formats)
{
	size_t i;

	for (i = 0; i < num_formats; i++) {
		struct nhlt_format *fmt;
		void *settings_data;
		size_t size;
		const struct nhlt_format_config *cfg = &formats[i];

		fmt = nhlt_add_format(endp, cfg->num_channels,
					cfg->sample_freq_khz,
					cfg->container_bits_per_sample,
					cfg->valid_bits_per_sample,
					cfg->speaker_mask);

		if (fmt == NULL)
			return -1;

		if (cfg->settings_file == NULL)
			continue;

		/* Find the settings file in CBFS and place it in format. */
		settings_data = cbfs_map(cfg->settings_file, &size);
		if (!settings_data)
			return -1;

		if (nhlt_format_append_config(fmt, settings_data, size)) {
			cbfs_unmap(settings_data);
			return -1;
		}

		cbfs_unmap(settings_data);
	}

	return 0;
}

static size_t calc_specific_config_size(struct nhlt_specific_config *cfg)
{
	return sizeof(cfg->size) + cfg->size;
}

static size_t calc_format_size(struct nhlt_format *fmt)
{
	size_t sz = 0;

	/* Wave format first. */
	sz += sizeof(fmt->waveform.tag);
	sz += sizeof(fmt->waveform.num_channels);
	sz += sizeof(fmt->waveform.samples_per_second);
	sz += sizeof(fmt->waveform.bytes_per_second);
	sz += sizeof(fmt->waveform.block_align);
	sz += sizeof(fmt->waveform.bits_per_sample);
	sz += sizeof(fmt->waveform.extra_size);
	sz += sizeof(fmt->waveform.valid_bits_per_sample);
	sz += sizeof(fmt->waveform.channel_mask);
	sz += sizeof(fmt->waveform.sub_format);

	sz += calc_specific_config_size(&fmt->config);

	return sz;
}

static size_t calc_endpoint_size(struct nhlt_endpoint *endp)
{
	int i;
	size_t sz = 0;

	sz += sizeof(endp->length) + sizeof(endp->link_type);
	sz += sizeof(endp->instance_id) + sizeof(endp->vendor_id);
	sz += sizeof(endp->device_id) + sizeof(endp->revision_id);
	sz += sizeof(endp->subsystem_id) + sizeof(endp->device_type);
	sz += sizeof(endp->direction) + sizeof(endp->virtual_bus_id);
	sz += calc_specific_config_size(&endp->config);
	sz += sizeof(endp->num_formats);

	for (i = 0; i < endp->num_formats; i++)
		sz += calc_format_size(&endp->formats[i]);

	/* Adjust endpoint length to reflect current configuration. */
	endp->length = sz;

	return sz;
}

static size_t calc_endpoints_size(struct nhlt *nhlt)
{
	int i;
	size_t sz = 0;

	for (i = 0; i < nhlt->num_endpoints; i++)
		sz += calc_endpoint_size(&nhlt->endpoints[i]);

	return sz;
}

static size_t calc_size(struct nhlt *nhlt)
{
	return sizeof(nhlt->num_endpoints) + calc_endpoints_size(nhlt);
}

size_t nhlt_current_size(struct nhlt *nhlt)
{
	return calc_size(nhlt) + sizeof(acpi_header_t) + sizeof(uint32_t);
}

static void nhlt_free_resources(struct nhlt *nhlt)
{
	int i;
	int j;

	/* Free all specific configs. */
	for (i = 0; i < nhlt->num_endpoints; i++) {
		struct nhlt_endpoint *endp = &nhlt->endpoints[i];

		free(endp->config.capabilities);
		for (j = 0; j < endp->num_formats; j++) {
			struct nhlt_format *fmt = &endp->formats[j];

			free(fmt->config.capabilities);
		}
	}

	/* Free nhlt object proper. */
	free(nhlt);
}

struct cursor {
	uint8_t *buf;
};

static void ser8(struct cursor *cur, uint8_t val)
{
	write_le8(cur->buf, val);
	cur->buf += sizeof(val);
}

static void ser16(struct cursor *cur, uint16_t val)
{
	write_le16(cur->buf, val);
	cur->buf += sizeof(val);
}

static void ser32(struct cursor *cur, uint32_t val)
{
	write_le32(cur->buf, val);
	cur->buf += sizeof(val);
}

static void serblob(struct cursor *cur, void *from, size_t sz)
{
	memcpy(cur->buf, from, sz);
	cur->buf += sz;
}

static void serialize_specific_config(struct nhlt_specific_config *cfg,
					struct cursor *cur)
{
	ser32(cur, cfg->size);
	serblob(cur, cfg->capabilities, cfg->size);
}

static void serialize_waveform(struct nhlt_waveform *wave, struct cursor *cur)
{
	ser16(cur, wave->tag);
	ser16(cur, wave->num_channels);
	ser32(cur, wave->samples_per_second);
	ser32(cur, wave->bytes_per_second);
	ser16(cur, wave->block_align);
	ser16(cur, wave->bits_per_sample);
	ser16(cur, wave->extra_size);
	ser16(cur, wave->valid_bits_per_sample);
	ser32(cur, wave->channel_mask);
	ser32(cur, wave->sub_format.data1);
	ser16(cur, wave->sub_format.data2);
	ser16(cur, wave->sub_format.data3);
	serblob(cur, wave->sub_format.data4, sizeof(wave->sub_format.data4));
}

static void serialize_format(struct nhlt_format *fmt, struct cursor *cur)
{
	serialize_waveform(&fmt->waveform, cur);
	serialize_specific_config(&fmt->config, cur);
}

static void serialize_endpoint(struct nhlt_endpoint *endp, struct cursor *cur)
{
	int i;

	ser32(cur, endp->length);
	ser8(cur, endp->link_type);
	ser8(cur, endp->instance_id);
	ser16(cur, endp->vendor_id);
	ser16(cur, endp->device_id);
	ser16(cur, endp->revision_id);
	ser32(cur, endp->subsystem_id);
	ser8(cur, endp->device_type);
	ser8(cur, endp->direction);
	ser8(cur, endp->virtual_bus_id);
	serialize_specific_config(&endp->config, cur);
	ser8(cur, endp->num_formats);

	for (i = 0; i < endp->num_formats; i++)
		serialize_format(&endp->formats[i], cur);
}

static void nhlt_serialize_endpoints(struct nhlt *nhlt, struct cursor *cur)
{
	int i, capabilities_size = 0;

	ser8(cur, nhlt->num_endpoints);

	for (i = 0; i < nhlt->num_endpoints; i++)
		serialize_endpoint(&nhlt->endpoints[i], cur);
	ser32(cur, capabilities_size);
}

uintptr_t nhlt_serialize(struct nhlt *nhlt, uintptr_t acpi_addr)
{
	return nhlt_serialize_oem_overrides(nhlt, acpi_addr, NULL, NULL, 0);
}

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)
{
	struct cursor cur;
	acpi_header_t *header;
	size_t sz;
	size_t oem_id_len;
	size_t oem_table_id_len;

	printk(BIOS_DEBUG, "ACPI:    * NHLT\n");

	sz = nhlt_current_size(nhlt);

	/* Create header */
	header = (void *)acpi_addr;
	memset(header, 0, sizeof(acpi_header_t));
	memcpy(header->signature, "NHLT", 4);
	write_le32(&header->length, sz);
	write_le8(&header->revision, get_acpi_table_revision(NHLT));

	if (oem_id == NULL)
		oem_id = OEM_ID;

	if (oem_table_id == NULL)
		oem_table_id = ACPI_TABLE_CREATOR;

	oem_id_len = MIN(strlen(oem_id), 6);
	oem_table_id_len = MIN(strlen(oem_table_id), 8);

	memcpy(header->oem_id, oem_id, oem_id_len);
	memcpy(header->oem_table_id, oem_table_id, oem_table_id_len);
	write_le32(&header->oem_revision, oem_revision);
	memcpy(header->asl_compiler_id, ASLC, 4);

	cur.buf = (void *)(acpi_addr + sizeof(acpi_header_t));
	nhlt_serialize_endpoints(nhlt, &cur);

	write_le8(&header->checksum, acpi_checksum((void *)header, sz));

	nhlt_free_resources(nhlt);

	acpi_addr += sz;
	acpi_addr = ALIGN_UP(acpi_addr, 16);

	return acpi_addr;
}

static int _nhlt_add_single_endpoint(struct nhlt *nhlt, int virtual_bus_id,
					const struct nhlt_endp_descriptor *epd)
{
	struct nhlt_endpoint *endp;

	endp = nhlt_add_endpoint(nhlt, epd->link, epd->device, epd->direction,
				epd->vid, epd->did);

	if (endp == NULL)
		return -1;

	endp->virtual_bus_id = virtual_bus_id;

	if (nhlt_endpoint_append_config(endp, epd->cfg, epd->cfg_size))
		return -1;

	if (nhlt_endpoint_add_formats(endp, epd->formats, epd->num_formats))
		return -1;

	return 0;
}

static int _nhlt_add_endpoints(struct nhlt *nhlt, int virtual_bus_id,
			const struct nhlt_endp_descriptor *epds,
			size_t num_epds)
{
	size_t i;

	for (i = 0; i < num_epds; i++)
		if (_nhlt_add_single_endpoint(nhlt, virtual_bus_id, &epds[i]))
			return -1;

	return 0;
}

int nhlt_add_endpoints(struct nhlt *nhlt,
			const struct nhlt_endp_descriptor *epds,
			size_t num_epds)
{
	int ret;
	ret = _nhlt_add_endpoints(nhlt, DEFAULT_VIRTUAL_BUS_ID, epds, num_epds);
	return ret;
}

int nhlt_add_ssp_endpoints(struct nhlt *nhlt, int virtual_bus_id,
		const struct nhlt_endp_descriptor *epds, size_t num_epds)
{
	return  _nhlt_add_endpoints(nhlt, virtual_bus_id, epds, num_epds);
}