src/soc/intel/xeon_sp/acpi.c

/* SPDX-License-Identifier: GPL-2.0-or-later */

#include <assert.h>
#include <intelblocks/acpi.h>
#include <soc/chip_common.h>
#include <soc/pci_devs.h>
#include <soc/util.h>
#include <stdint.h>
#include <stdlib.h>

#include "chip.h"

/*
 * List of supported C-states in this processor.
 */
enum {
	C_STATE_C1,	/* 0 */
	C_STATE_C3,	/* 1 */
	C_STATE_C6,	/* 2 */
	C_STATE_C7,	/* 3 */
	NUM_C_STATES
};

static const acpi_cstate_t cstate_map[NUM_C_STATES] = {
	[C_STATE_C1] = {
		/* C1 */
		.latency = 1,
		.power = 0x3e8,
		.resource = MWAIT_RES(0, 0),
	},
	[C_STATE_C3] = {
		/* C3 */
		.latency = 15,
		.power = 0x1f4,
		.resource = MWAIT_RES(1, 0),
	},
	[C_STATE_C6] = {
		/* C6 */
		.latency = 41,
		.power = 0x15e,
		.resource = MWAIT_RES(2, 0),
	},
	[C_STATE_C7] = {
		/* C7 */
		.latency = 41,
		.power = 0x0c8,
		.resource = MWAIT_RES(3, 0),
	}
};

/* Max states supported */
static int cstate_set_all[] = {
	C_STATE_C1,
	C_STATE_C3,
	C_STATE_C6,
	C_STATE_C7
};

static int cstate_set_c1_c6[] = {
	C_STATE_C1,
	C_STATE_C6,
};

const acpi_cstate_t *soc_get_cstate_map(size_t *entries)
{
	static acpi_cstate_t map[ARRAY_SIZE(cstate_set_all)];
	int *cstate_set;
	int i;

	const config_t *config = config_of_soc();

	const enum acpi_cstate_mode states = config->cstate_states;

	switch (states) {
	case CSTATES_C1C6:
		*entries = ARRAY_SIZE(cstate_set_c1_c6);
		cstate_set = cstate_set_c1_c6;
		break;
	case CSTATES_ALL:
	default:
		*entries = ARRAY_SIZE(cstate_set_all);
		cstate_set = cstate_set_all;
		break;
	}

	for (i = 0; i < *entries; i++) {
		map[i] = cstate_map[cstate_set[i]];
		map[i].ctype = i + 1;
	}
	return map;
}

void iio_domain_set_acpi_name(struct device *dev, const char *prefix)
{
	const union xeon_domain_path dn = {
		.domain_path = dev->path.domain.domain
	};

	assert(dn.socket < CONFIG_MAX_SOCKET);
	assert(dn.stack < 16);
	assert(prefix != NULL && strlen(prefix) == 2);

	if (dn.socket >= CONFIG_MAX_SOCKET || dn.stack >= 16 ||
	    !prefix || strlen(prefix) != 2)
		return;

	char *name = xmalloc(ACPI_NAME_BUFFER_SIZE);
	snprintf(name, ACPI_NAME_BUFFER_SIZE, "%s%1X%1X", prefix, dn.socket, dn.stack);
	dev->name = name;
}

const char *soc_acpi_name(const struct device *dev)
{
	if (dev->path.type == DEVICE_PATH_DOMAIN)
		return dev->name;

	/* FIXME: Add SoC specific device names here */

	return NULL;
}