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