include/hw/acpi/generic_event_device.h

   1 /*
   2  *
   3  * Copyright (c) 2018 Intel Corporation
   4  * Copyright (c) 2019 Huawei Technologies R & D (UK) Ltd
   5  * Written by Samuel Ortiz, Shameer Kolothum
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2 or later, as published by the Free Software Foundation.
  10  *
  11  * The ACPI Generic Event Device (GED) is a hardware-reduced specific
  12  * device[ACPI v6.1 Section 5.6.9] that handles all platform events,
  13  * including the hotplug ones. Generic Event Device allows platforms
  14  * to handle interrupts in ACPI ASL statements. It follows a very
  15  * similar approach like the _EVT method from GPIO events. All
  16  * interrupts are listed in  _CRS and the handler is written in _EVT
  17  * method. Here, we use a single interrupt for the GED device, relying
  18  * on IO memory region to communicate the type of device affected by
  19  * the interrupt. This way, we can support up to 32 events with a
  20  * unique interrupt.
  21  *
  22  * Here is an example.
  23  *
  24  * Device (\_SB.GED)
  25  * {
  26  *     Name (_HID, "ACPI0013")
  27  *     Name (_UID, Zero)
  28  *     Name (_CRS, ResourceTemplate ()
  29  *     {
  30  *         Interrupt (ResourceConsumer, Edge, ActiveHigh, Exclusive, ,, )
  31  *         {
  32  *              0x00000029,
  33  *         }
  34  *     })
  35  *     OperationRegion (EREG, SystemMemory, 0x09080000, 0x04)
  36  *     Field (EREG, DWordAcc, NoLock, WriteAsZeros)
  37  *     {
  38  *         ESEL,   32
  39  *     }
  40  *
  41  *     Method (_EVT, 1, Serialized)  // _EVT: Event
  42  *     {
  43  *         Local0 = ESEL // ESEL = IO memory region which specifies the
  44  *                       // device type.
  45  *         If (((Local0 & One) == One))
  46  *         {
  47  *             MethodEvent1()
  48  *         }
  49  *         If ((Local0 & 0x2) == 0x2)
  50  *         {
  51  *             MethodEvent2()
  52  *         }
  53  *         ...
  54  *     }
  55  * }
  56  *
  57  */
  58
  59 #ifndef HW_ACPI_GED_H
  60 #define HW_ACPI_GED_H
  61
  62 #include "hw/sysbus.h"
  63 #include "hw/acpi/memory_hotplug.h"
  64
  65 #define ACPI_POWER_BUTTON_DEVICE "PWRB"
  66
  67 #define TYPE_ACPI_GED "acpi-ged"
  68 #define ACPI_GED(obj) \
  69     OBJECT_CHECK(AcpiGedState, (obj), TYPE_ACPI_GED)
  70
  71 #define ACPI_GED_EVT_SEL_OFFSET    0x0
  72 #define ACPI_GED_EVT_SEL_LEN       0x4
  73
  74 #define GED_DEVICE      "GED"
  75 #define AML_GED_EVT_REG "EREG"
  76 #define AML_GED_EVT_SEL "ESEL"
  77
  78 /*
  79  * Platforms need to specify the GED event bitmap
  80  * to describe what kind of events they want to support
  81  * through GED.
  82  */
  83 #define ACPI_GED_MEM_HOTPLUG_EVT   0x1
  84 #define ACPI_GED_PWR_DOWN_EVT      0x2
  85
  86 typedef struct GEDState {
  87     MemoryRegion io;
  88     uint32_t     sel;
  89 } GEDState;
  90
  91 typedef struct AcpiGedState {
  92     SysBusDevice parent_obj;
  93     MemHotplugState memhp_state;
  94     MemoryRegion container_memhp;
  95     GEDState ged_state;
  96     uint32_t ged_event_bitmap;
  97     qemu_irq irq;
  98 } AcpiGedState;
  99
 100 void build_ged_aml(Aml *table, const char* name, HotplugHandler *hotplug_dev,
 101                    uint32_t ged_irq, AmlRegionSpace rs, hwaddr ged_base);
 102
 103 #endif