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