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/** @file
*
* Secondary System Description Table (SSDT) for active (fan) cooling
*
* Copyright (c) 2020, Arm Ltd. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
#include <IndustryStandard/Bcm2711.h>
#include <IndustryStandard/Bcm2836.h>
#include <IndustryStandard/Bcm2836Gpio.h>
#include <IndustryStandard/Acpi.h>
DefinitionBlock (__FILE__, "SSDT", 5, "RPIFDN", "RPITHFAN", 2)
{
External (\_SB_.EC00, DeviceObj)
External (\_SB_.EC00.TZ00, DeviceObj)
Scope (\_SB_.EC00)
{
// Define a NameOp we will modify during InstallTable
Name (GIOP, 0x2) //08 47 49 4f 50 0a 02 (value must be >1)
Name (FTMP, 0x2)
// Describe a fan
PowerResource (PFAN, 0, 0) {
OperationRegion (GPIO, SystemMemory, GPIO_BASE_ADDRESS, 0x1000)
Field (GPIO, DWordAcc, NoLock, Preserve) {
Offset (0x1C),
GPS0, 32,
GPS1, 32,
RES1, 32,
GPC0, 32,
GPC1, 32,
RES2, 32,
GPL1, 32,
GPL2, 32
}
// We are hitting a GPIO pin to on/off a fan.
// This assumes that UEFI has programmed the
// direction as OUT. Given the current limitations
// on the GPIO pins, its recommended to use
// the GPIO to switch a larger voltage/current
// for the fan rather than driving it directly.
Method (_STA) {
if (GPL1 & (1 << GIOP)) {
Return (1) // present and enabled
}
Return (0)
}
Method (_ON) { // turn fan on
Store (1 << GIOP, GPS0)
}
Method (_OFF) { // turn fan off
Store (1 << GIOP, GPC0)
}
}
Device (FAN0) {
// Note, not currently an ACPIv4 fan
// the latter adds speed control/detection
// but in the case of linux needs FIF, FPS, FSL, and FST
Name (_HID, EISAID ("PNP0C0B"))
Name (_PR0, Package () { PFAN })
}
}
// merge in an active cooling point.
Scope (\_SB_.EC00.TZ00)
{
Method (_AC0) { Return ( (FTMP * 10) + 2732) } // (60C) active cooling trip point,
// if this is lower than PSV then we
// prefer active cooling
Name (_AL0, Package () { \_SB_.EC00.FAN0 }) // the fan used for AC0 above
}
}
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