122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/*
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*
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* Copyright (c) 2018 Intel Corporation
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* Copyright (c) 2019 Huawei Technologies R & D (UK) Ltd
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* Written by Samuel Ortiz, Shameer Kolothum
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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*
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* The ACPI Generic Event Device (GED) is a hardware-reduced specific
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* device[ACPI v6.1 Section 5.6.9] that handles all platform events,
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* including the hotplug ones. Generic Event Device allows platforms
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* to handle interrupts in ACPI ASL statements. It follows a very
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* similar approach like the _EVT method from GPIO events. All
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* interrupts are listed in _CRS and the handler is written in _EVT
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* method. Here, we use a single interrupt for the GED device, relying
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* on IO memory region to communicate the type of device affected by
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* the interrupt. This way, we can support up to 32 events with a
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* unique interrupt.
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*
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* Here is an example.
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*
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* Device (\_SB.GED)
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* {
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* Name (_HID, "ACPI0013")
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* Name (_UID, Zero)
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* Name (_CRS, ResourceTemplate ()
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* {
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* Interrupt (ResourceConsumer, Edge, ActiveHigh, Exclusive, ,, )
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* {
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* 0x00000029,
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* }
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* })
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* OperationRegion (EREG, SystemMemory, 0x09080000, 0x04)
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* Field (EREG, DWordAcc, NoLock, WriteAsZeros)
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* {
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* ESEL, 32
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* }
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*
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* Method (_EVT, 1, Serialized) // _EVT: Event
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* {
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* Local0 = ESEL // ESEL = IO memory region which specifies the
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* // device type.
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* If (((Local0 & One) == One))
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* {
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* MethodEvent1()
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* }
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* If ((Local0 & 0x2) == 0x2)
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* {
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* MethodEvent2()
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* }
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* ...
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* }
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* }
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*
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*/
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#ifndef HW_ACPI_GENERIC_EVENT_DEVICE_H
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#define HW_ACPI_GENERIC_EVENT_DEVICE_H
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#include "hw/sysbus.h"
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#include "hw/acpi/memory_hotplug.h"
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#include "hw/acpi/ghes.h"
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#include "qom/object.h"
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#define ACPI_POWER_BUTTON_DEVICE "PWRB"
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#define TYPE_ACPI_GED "acpi-ged"
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OBJECT_DECLARE_SIMPLE_TYPE(AcpiGedState, ACPI_GED)
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#define TYPE_ACPI_GED_X86 "acpi-ged-x86"
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#define ACPI_GED_EVT_SEL_OFFSET 0x0
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#define ACPI_GED_EVT_SEL_LEN 0x4
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#define ACPI_GED_REG_SLEEP_CTL 0x00
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#define ACPI_GED_REG_SLEEP_STS 0x01
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#define ACPI_GED_REG_RESET 0x02
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#define ACPI_GED_REG_COUNT 0x03
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/* ACPI_GED_REG_RESET value for reset*/
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#define ACPI_GED_RESET_VALUE 0x42
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/* ACPI_GED_REG_SLEEP_CTL.SLP_TYP value for S5 (aka poweroff) */
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#define ACPI_GED_SLP_TYP_S5 0x05
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#define GED_DEVICE "GED"
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#define AML_GED_EVT_REG "EREG"
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#define AML_GED_EVT_SEL "ESEL"
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/*
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* Platforms need to specify the GED event bitmap
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* to describe what kind of events they want to support
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* through GED.
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*/
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#define ACPI_GED_MEM_HOTPLUG_EVT 0x1
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#define ACPI_GED_PWR_DOWN_EVT 0x2
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#define ACPI_GED_NVDIMM_HOTPLUG_EVT 0x4
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typedef struct GEDState {
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MemoryRegion evt;
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MemoryRegion regs;
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uint32_t sel;
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} GEDState;
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struct AcpiGedState {
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SysBusDevice parent_obj;
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MemHotplugState memhp_state;
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MemoryRegion container_memhp;
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GEDState ged_state;
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uint32_t ged_event_bitmap;
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qemu_irq irq;
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AcpiGhesState ghes_state;
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};
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void build_ged_aml(Aml *table, const char* name, HotplugHandler *hotplug_dev,
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uint32_t ged_irq, AmlRegionSpace rs, hwaddr ged_base);
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void acpi_dsdt_add_power_button(Aml *scope);
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#endif
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