LXR qemu/hw/rtc/sun4v-rtc.c

   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 "qapi/error.h"
  15#include "qemu/module.h"
  16#include "qemu/timer.h"
  17#include "hw/rtc/sun4v-rtc.h"
  18#include "trace.h"
  19#include "qom/object.h"
  20
  21
  22#define TYPE_SUN4V_RTC "sun4v_rtc"
  23OBJECT_DECLARE_SIMPLE_TYPE(Sun4vRtc, SUN4V_RTC)
  24
  25struct Sun4vRtc {
  26    SysBusDevice parent_obj;
  27
  28    MemoryRegion iomem;
  29};
  30
  31static uint64_t sun4v_rtc_read(void *opaque, hwaddr addr,
  32                                unsigned size)
  33{
  34    uint64_t val = get_clock_realtime() / NANOSECONDS_PER_SECOND;
  35    if (!(addr & 4ULL)) {
  36        /* accessing the high 32 bits */
  37        val >>= 32;
  38    }
  39    trace_sun4v_rtc_read(addr, val);
  40    return val;
  41}
  42
  43static void sun4v_rtc_write(void *opaque, hwaddr addr,
  44                             uint64_t val, unsigned size)
  45{
  46    trace_sun4v_rtc_write(addr, val);
  47}
  48
  49static const MemoryRegionOps sun4v_rtc_ops = {
  50    .read = sun4v_rtc_read,
  51    .write = sun4v_rtc_write,
  52    .endianness = DEVICE_NATIVE_ENDIAN,
  53};
  54
  55void sun4v_rtc_init(hwaddr addr)
  56{
  57    DeviceState *dev;
  58    SysBusDevice *s;
  59
  60    dev = qdev_new(TYPE_SUN4V_RTC);
  61    s = SYS_BUS_DEVICE(dev);
  62
  63    sysbus_realize_and_unref(s, &error_fatal);
  64
  65    sysbus_mmio_map(s, 0, addr);
  66}
  67
  68static void sun4v_rtc_realize(DeviceState *dev, Error **errp)
  69{
  70    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
  71    Sun4vRtc *s = SUN4V_RTC(dev);
  72
  73    memory_region_init_io(&s->iomem, OBJECT(s), &sun4v_rtc_ops, s,
  74                          "sun4v-rtc", 0x08ULL);
  75    sysbus_init_mmio(sbd, &s->iomem);
  76}
  77
  78static void sun4v_rtc_class_init(ObjectClass *klass, void *data)
  79{
  80    DeviceClass *dc = DEVICE_CLASS(klass);
  81
  82    dc->realize = sun4v_rtc_realize;
  83}
  84
  85static const TypeInfo sun4v_rtc_info = {
  86    .name          = TYPE_SUN4V_RTC,
  87    .parent        = TYPE_SYS_BUS_DEVICE,
  88    .instance_size = sizeof(Sun4vRtc),
  89    .class_init    = sun4v_rtc_class_init,
  90};
  91
  92static void sun4v_rtc_register_types(void)
  93{
  94    type_register_static(&sun4v_rtc_info);
  95}
  96
  97type_init(sun4v_rtc_register_types)
  98