LXR qemu/hw/timer/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/hw.h"
  14#include "hw/sysbus.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
  23typedef struct Sun4vRtc {
  24    SysBusDevice parent_obj;
  25
  26    MemoryRegion iomem;
  27} Sun4vRtc;
  28
  29static 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
  41static void sun4v_rtc_write(void *opaque, hwaddr addr,
  42                             uint64_t val, unsigned size)
  43{
  44    trace_sun4v_rtc_write(addr, val);
  45}
  46
  47static const MemoryRegionOps sun4v_rtc_ops = {
  48    .read = sun4v_rtc_read,
  49    .write = sun4v_rtc_write,
  50    .endianness = DEVICE_NATIVE_ENDIAN,
  51};
  52
  53void 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
  66static 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
  76static 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
  83static 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
  90static void sun4v_rtc_register_types(void)
  91{
  92    type_register_static(&sun4v_rtc_info);
  93}
  94
  95type_init(sun4v_rtc_register_types)
  96