drivers/acpi: Add a chip driver to generate thermal zone
Given the following device tree entry:
chip drivers/acpi/thermal_zone
register "description" = ""CPU""
use chrome_ec as temperature_controller
register "sensor_id" = "0"
register "polling_period" = "10"
register "critical_temperature" = "91"
register "passive_config" = "{
.temperature = 85,
}"
register "use_acpi1_thermal_zone_scope" = "true"
device generic 0 on end
end
It will generate the following:
Scope (\_TZ)
{
ThermalZone (TM00)
{
Name (_STR, "CPU") // _STR: Description String
Name (_RTV, Zero) // _RTV: Relative Temperature Values
Name (_TZP, 0x64) // _TZP: Thermal Zone Polling
Name (_CRT, 0x0E39) // _CRT: Critical Temperature
Name (_PSV, 0x0DFD) // _PSV: Passive Temperature
Name (_PSL, Package (0x10) // _PSL: Passive List
{
\_SB.CP00,
\_SB.CP01,
\_SB.CP02,
\_SB.CP03,
\_SB.CP04,
\_SB.CP05,
\_SB.CP06,
\_SB.CP07,
\_SB.CP08,
\_SB.CP09,
})
Name (_TC1, 0x02) // _TC1: Thermal Constant 1
Name (_TC2, 0x05) // _TC2: Thermal Constant 2
Name (_TSP, 0x14) // _TSP: Thermal Sampling Period
Method (_TMP, 0, Serialized) // _TMP: Temperature
{
Return (\_SB.PCI0.LPCB.EC0.CREC.TMP (Zero))
}
}
}
BUG=b:186166365
TEST=Boot guybrush to OS and verify thermal zone works
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Iee2a42db749f18eef6c3f73cdbb3441567301e5d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54132
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
This commit is contained in:
Raul E Rangel
Patrick Georgi
parent
a9efed5fd9
commit
9bf32b9701
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config DRIVERS_ACPI_THERMAL_ZONE
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bool
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default n
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depends on HAVE_ACPI_TABLES
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help
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Adds a chip driver that generates ACPI ThermalZones. See the chapter
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on Thermal Management in the ACPI specification.
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ramstage-$(CONFIG_DRIVERS_ACPI_THERMAL_ZONE) += thermal_zone.c
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/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __DRIVERS_ACPI_THERMAL_ZONE_H__
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#define __DRIVERS_ACPI_THERMAL_ZONE_H__
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#include <types.h>
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/*
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* All temperature units are in Celsius.
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* All time units are in seconds.
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*/
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struct drivers_acpi_thermal_zone_config {
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/* Description of the thermal zone */
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const char *description;
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/*
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* Device that will provide the temperature reading
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*
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* This device must have an ACPI method named `TMP` that accepts the
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* sensor ID as the first argument. It must then return an Integer containing the
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* sensor's temperature in deci-Kelvin.
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*/
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DEVTREE_CONST struct device *temperature_controller;
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/* Used to identify the temperature sensor */
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unsigned int sensor_id;
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/* The polling period in seconds for this thermal zone. */
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unsigned int polling_period;
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/* The temperature (_CRT) at which the OS must shutdown the system. */
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unsigned int critical_temperature;
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/* The temperature (_HOT) at which the OS may choose to hibernate the system */
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unsigned int hibernate_temperature;
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struct acpi_thermal_zone_passive_config {
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/*
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* The temperature (_PSV) at which the OS must activate passive cooling (i.e.,
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* throttle the CPUs).
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*/
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unsigned int temperature;
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/**
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* DeltaP[%] = _TC1 * (Tn - Tn-1) + _TC2 * (Tn - Tt)
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* Where:
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* Tn = current temperature
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* Tt = target temperature (_PSV)
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*
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* If any of these values are 0, then one of the following defaults will be
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* used: TC1: 2, TC2: 5, TSP: 10
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*/
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unsigned int time_constant_1;
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unsigned int time_constant_2;
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unsigned int time_sampling_period;
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} passive_config;
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/* Place the ThermalZone in the \_TZ scope */
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bool use_acpi1_thermal_zone_scope;
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};
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#endif /* __DRIVERS_ACPI_THERMAL_ZONE_H__ */
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@ -0,0 +1,131 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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#include <acpi/acpigen.h>
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#include <assert.h>
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#include <commonlib/bsd/helpers.h>
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#include <console/console.h>
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#include <device/device.h>
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#include <stdlib.h>
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#include <string.h>
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#include "chip.h"
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#define TZ_DEVICE_PATH "\\_TZ"
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/* These defaults should be good enough for most systems */
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#define DEFAULT_TC1 2
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#define DEFAULT_TC2 5
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#define DEFAULT_TSP 10
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#define CELSIUS_TO_DECI_KELVIN(temp_c) ((temp_c) * 10 + 2731)
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#define SECONDS_TO_DECI_SECONDS(s) ((s) * 10)
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static const char *thermal_zone_acpi_name(const struct device *dev)
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{
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char *name;
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if (dev->path.type != DEVICE_PATH_GENERIC)
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return NULL;
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name = malloc(ACPI_NAME_BUFFER_SIZE);
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snprintf(name, ACPI_NAME_BUFFER_SIZE, "TM%02X", dev->path.generic.id);
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return name;
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}
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static void thermal_zone_fill_ssdt(const struct device *dev)
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{
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struct drivers_acpi_thermal_zone_config *config = config_of(dev);
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const char *scope;
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const char *name;
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assert(dev->path.type == DEVICE_PATH_GENERIC);
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if (config->use_acpi1_thermal_zone_scope)
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scope = TZ_DEVICE_PATH;
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else
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scope = acpi_device_scope(dev);
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name = acpi_device_name(dev);
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assert(name);
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assert(scope);
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if (!config->temperature_controller) {
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printk(BIOS_ERR, "%s: missing temperature_controller\n", dev_path(dev));
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return;
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}
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printk(BIOS_INFO, "%s.%s: %s at %s\n", scope, name, dev->chip_ops->name, dev_path(dev));
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acpigen_write_scope(scope);
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acpigen_write_thermal_zone(name);
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if (config->description)
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acpigen_write_name_string("_STR", config->description);
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if (config->polling_period)
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acpigen_write_name_integer(
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"_TZP", SECONDS_TO_DECI_SECONDS(config->polling_period));
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if (config->critical_temperature)
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acpigen_write_name_integer(
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"_CRT", CELSIUS_TO_DECI_KELVIN(config->critical_temperature));
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if (config->hibernate_temperature)
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acpigen_write_name_integer(
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"_HOT", CELSIUS_TO_DECI_KELVIN(config->hibernate_temperature));
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if (config->passive_config.temperature) {
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acpigen_write_name_integer(
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"_PSV", CELSIUS_TO_DECI_KELVIN(config->passive_config.temperature));
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/*
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* The linux kernel currently has an artificial limit of 10 on the number of
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* references that can be returned in a list. If we don't respect this limit,
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* then the passive threshold won't work.
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*
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* See https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/third_party/kernel/v5.10/include/acpi/acpi_bus.h;l=19
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*/
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acpigen_write_processor_package("_PSL", 0, MIN(10, dev_count_cpu()));
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acpigen_write_name_integer("_TC1", config->passive_config.time_constant_1
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?: DEFAULT_TC1);
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acpigen_write_name_integer("_TC2", config->passive_config.time_constant_2
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?: DEFAULT_TC2);
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acpigen_write_name_integer(
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"_TSP",
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SECONDS_TO_DECI_SECONDS(config->passive_config.time_sampling_period
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?: DEFAULT_TSP));
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}
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/*
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* Method (_TMP) {
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* Return (<path>.TMP(<sensor_id>))
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* }
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*/
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acpigen_write_method_serialized("_TMP", 0);
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acpigen_emit_byte(RETURN_OP);
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acpigen_emit_namestring(acpi_device_path_join(config->temperature_controller, "TMP"));
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acpigen_write_integer(config->sensor_id);
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acpigen_write_method_end();
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acpigen_write_thermal_zone_end();
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acpigen_write_scope_end();
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}
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static struct device_operations thermal_zone_ops = {
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.read_resources = noop_read_resources,
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.set_resources = noop_set_resources,
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.acpi_name = thermal_zone_acpi_name,
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.acpi_fill_ssdt = thermal_zone_fill_ssdt,
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};
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static void thermal_zone_enable_dev(struct device *dev)
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{
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dev->ops = &thermal_zone_ops;
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}
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struct chip_operations drivers_acpi_thermal_zone_ops = {
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CHIP_NAME("ACPI Thermal Zone")
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.enable_dev = thermal_zone_enable_dev,
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};
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