1 | /* |
2 | * QEMU sun4v Real Time Clock device |
3 | * |
4 | * The sun4v_rtc device (sun4v tod clock) |
5 | * |
6 | * Copyright (c) 2016 Artyom Tarasenko |
7 | * |
8 | * This code is licensed under the GNU GPL v3 or (at your option) any later |
9 | * version. |
10 | */ |
11 | |
12 | #include "qemu/osdep.h" |
13 | #include "hw/sysbus.h" |
14 | #include "qemu/module.h" |
15 | #include "qemu/timer.h" |
16 | #include "hw/timer/sun4v-rtc.h" |
17 | #include "trace.h" |
18 | |
19 | |
20 | #define TYPE_SUN4V_RTC "sun4v_rtc" |
21 | #define SUN4V_RTC(obj) OBJECT_CHECK(Sun4vRtc, (obj), TYPE_SUN4V_RTC) |
22 | |
23 | typedef struct Sun4vRtc { |
24 | SysBusDevice parent_obj; |
25 | |
26 | MemoryRegion iomem; |
27 | } Sun4vRtc; |
28 | |
29 | static uint64_t sun4v_rtc_read(void *opaque, hwaddr addr, |
30 | unsigned size) |
31 | { |
32 | uint64_t val = get_clock_realtime() / NANOSECONDS_PER_SECOND; |
33 | if (!(addr & 4ULL)) { |
34 | /* accessing the high 32 bits */ |
35 | val >>= 32; |
36 | } |
37 | trace_sun4v_rtc_read(addr, val); |
38 | return val; |
39 | } |
40 | |
41 | static void sun4v_rtc_write(void *opaque, hwaddr addr, |
42 | uint64_t val, unsigned size) |
43 | { |
44 | trace_sun4v_rtc_write(addr, val); |
45 | } |
46 | |
47 | static const MemoryRegionOps sun4v_rtc_ops = { |
48 | .read = sun4v_rtc_read, |
49 | .write = sun4v_rtc_write, |
50 | .endianness = DEVICE_NATIVE_ENDIAN, |
51 | }; |
52 | |
53 | void sun4v_rtc_init(hwaddr addr) |
54 | { |
55 | DeviceState *dev; |
56 | SysBusDevice *s; |
57 | |
58 | dev = qdev_create(NULL, TYPE_SUN4V_RTC); |
59 | s = SYS_BUS_DEVICE(dev); |
60 | |
61 | qdev_init_nofail(dev); |
62 | |
63 | sysbus_mmio_map(s, 0, addr); |
64 | } |
65 | |
66 | static void sun4v_rtc_realize(DeviceState *dev, Error **errp) |
67 | { |
68 | SysBusDevice *sbd = SYS_BUS_DEVICE(dev); |
69 | Sun4vRtc *s = SUN4V_RTC(dev); |
70 | |
71 | memory_region_init_io(&s->iomem, OBJECT(s), &sun4v_rtc_ops, s, |
72 | "sun4v-rtc" , 0x08ULL); |
73 | sysbus_init_mmio(sbd, &s->iomem); |
74 | } |
75 | |
76 | static void sun4v_rtc_class_init(ObjectClass *klass, void *data) |
77 | { |
78 | DeviceClass *dc = DEVICE_CLASS(klass); |
79 | |
80 | dc->realize = sun4v_rtc_realize; |
81 | } |
82 | |
83 | static const TypeInfo sun4v_rtc_info = { |
84 | .name = TYPE_SUN4V_RTC, |
85 | .parent = TYPE_SYS_BUS_DEVICE, |
86 | .instance_size = sizeof(Sun4vRtc), |
87 | .class_init = sun4v_rtc_class_init, |
88 | }; |
89 | |
90 | static void sun4v_rtc_register_types(void) |
91 | { |
92 | type_register_static(&sun4v_rtc_info); |
93 | } |
94 | |
95 | type_init(sun4v_rtc_register_types) |
96 | |