101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
|
/*
|
||
|
|
*
|
||
|
|
* 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 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
|
||
|
|
|
||
|
|
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
|