hw/clock: Only propagate clock changes if the clock is changed
[qemu.git] / 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 #include "hw/acpi/ghes.h"
65
66 #define ACPI_POWER_BUTTON_DEVICE "PWRB"
67
68 #define TYPE_ACPI_GED "acpi-ged"
69 #define ACPI_GED(obj) \
70 OBJECT_CHECK(AcpiGedState, (obj), TYPE_ACPI_GED)
71
72 #define ACPI_GED_EVT_SEL_OFFSET 0x0
73 #define ACPI_GED_EVT_SEL_LEN 0x4
74
75 #define GED_DEVICE "GED"
76 #define AML_GED_EVT_REG "EREG"
77 #define AML_GED_EVT_SEL "ESEL"
78
79 /*
80 * Platforms need to specify the GED event bitmap
81 * to describe what kind of events they want to support
82 * through GED.
83 */
84 #define ACPI_GED_MEM_HOTPLUG_EVT 0x1
85 #define ACPI_GED_PWR_DOWN_EVT 0x2
86 #define ACPI_GED_NVDIMM_HOTPLUG_EVT 0x4
87
88 typedef struct GEDState {
89 MemoryRegion evt;
90 uint32_t sel;
91 } GEDState;
92
93 typedef struct AcpiGedState {
94 SysBusDevice parent_obj;
95 MemHotplugState memhp_state;
96 MemoryRegion container_memhp;
97 GEDState ged_state;
98 uint32_t ged_event_bitmap;
99 qemu_irq irq;
100 AcpiGhesState ghes_state;
101 } AcpiGedState;
102
103 void build_ged_aml(Aml *table, const char* name, HotplugHandler *hotplug_dev,
104 uint32_t ged_irq, AmlRegionSpace rs, hwaddr ged_base);
105
106 #endif