From c41f7f15c192d06b5dfdeb1b74f99278cee66110 Mon Sep 17 00:00:00 2001 From: Tim Wawrzynczak Date: Fri, 29 May 2020 13:56:37 -0600 Subject: dptf: Add support for generation of Active Policies This change adds support for generating the different pieces of DPTF Active Policies. This includes the Active Relationship Table, in addition to _ACx methods. BUG=b:143539650 TEST=compiles Change-Id: Iea0ccbd96f88d0f3a8f2c77a7d0f3a284e5ee463 Signed-off-by: Tim Wawrzynczak Reviewed-on: https://review.coreboot.org/c/coreboot/+/41885 Tested-by: build bot (Jenkins) Reviewed-by: Sumeet R Pawnikar Reviewed-by: Duncan Laurie --- src/include/acpi/acpigen_dptf.h | 63 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 src/include/acpi/acpigen_dptf.h (limited to 'src/include/acpi/acpigen_dptf.h') diff --git a/src/include/acpi/acpigen_dptf.h b/src/include/acpi/acpigen_dptf.h new file mode 100644 index 0000000000..a082b62fd9 --- /dev/null +++ b/src/include/acpi/acpigen_dptf.h @@ -0,0 +1,63 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef ACPI_ACPIGEN_DPTF_H +#define ACPI_ACPIGEN_DPTF_H + +#include +#include + +/* A common idiom is to use a default value if none is provided (i.e., == 0) */ +#define DEFAULT_IF_0(thing, default_) ((thing) ? (thing) : (default_)) + +/* List of available participants (i.e., they can participate in policies) */ +enum dptf_participant { + DPTF_NONE, + DPTF_CPU, + DPTF_CHARGER, + DPTF_FAN, + DPTF_TEMP_SENSOR_0, + DPTF_TEMP_SENSOR_1, + DPTF_TEMP_SENSOR_2, + DPTF_TEMP_SENSOR_3, + DPTF_PARTICIPANT_COUNT, +}; + +/* DPTF compile-time constants */ +enum { + /* A device can only define _AC0 .. _AC9 i.e. between 0 and 10 Active Cooling Methods */ + DPTF_MAX_ACX = 10, + DPTF_MAX_ACTIVE_POLICIES = (DPTF_PARTICIPANT_COUNT-1), +}; + +/* Active Policy */ +struct dptf_active_policy { + /* Device capable of being affected by the fan */ + enum dptf_participant target; + /* Source's contribution to the Target's cooling capability as a percentage */ + uint8_t weight; + /* When target reaches temperature 'temp', the source will turn on at 'fan_pct' % */ + struct { + /* (degrees C) */ + uint8_t temp; + /* 0 - 100 */ + uint8_t fan_pct; + } thresholds[DPTF_MAX_ACX]; +}; + +/* + * This function provides tables of temperature and corresponding fan or percent. When the + * temperature thresholds are met (_AC0 - _AC9), the fan is driven to corresponding percentage + * of full speed. + */ +void dptf_write_active_policies(const struct dptf_active_policy *policies, int max_count); + +/* Helper method to open the scope for a given participant. */ +void dptf_write_scope(enum dptf_participant participant); + +/* + * Write out a _STA that will check the value of the DPTE field in GNVS, and return 0xF if DPTE + * is 1, otherwise it will return 0. + */ +void dptf_write_STA(void); + +#endif /* ACPI_ACPIGEN_DPTF_H */ -- cgit v1.2.3