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
  18//#define DEBUG_SUN4V_RTC
  19
  20#ifdef DEBUG_SUN4V_RTC
  21#define DPRINTF(fmt, ...)                                       \
  22    do { printf("sun4v_rtc: " fmt , ## __VA_ARGS__); } while (0)
  23#else
  24#define DPRINTF(fmt, ...) do {} while (0)
  25#endif
  26
  27#define TYPE_SUN4V_RTC "sun4v_rtc"
  28#define SUN4V_RTC(obj) OBJECT_CHECK(Sun4vRtc, (obj), TYPE_SUN4V_RTC)
  29
  30typedef struct Sun4vRtc {
  31    SysBusDevice parent_obj;
  32
  33    MemoryRegion iomem;
  34} Sun4vRtc;
  35
  36static uint64_t sun4v_rtc_read(void *opaque, hwaddr addr,
  37                                unsigned size)
  38{
  39    uint64_t val = get_clock_realtime() / NANOSECONDS_PER_SECOND;
  40    if (!(addr & 4ULL)) {
  41        /* accessing the high 32 bits */
  42        val >>= 32;
  43    }
  44    DPRINTF("read from " TARGET_FMT_plx " val %lx\n", addr, val);
  45    return val;
  46}
  47
  48static void sun4v_rtc_write(void *opaque, hwaddr addr,
  49                             uint64_t val, unsigned size)
  50{
  51    DPRINTF("write 0x%x to " TARGET_FMT_plx "\n", (unsigned)val, addr);
  52}
  53
  54static const MemoryRegionOps sun4v_rtc_ops = {
  55    .read = sun4v_rtc_read,
  56    .write = sun4v_rtc_write,
  57    .endianness = DEVICE_NATIVE_ENDIAN,
  58};
  59
  60void sun4v_rtc_init(hwaddr addr)
  61{
  62    DeviceState *dev;
  63    SysBusDevice *s;
  64
  65    dev = qdev_create(NULL, TYPE_SUN4V_RTC);
  66    s = SYS_BUS_DEVICE(dev);
  67
  68    qdev_init_nofail(dev);
  69
  70    sysbus_mmio_map(s, 0, addr);
  71}
  72
  73static int sun4v_rtc_init1(SysBusDevice *dev)
  74{
  75    Sun4vRtc *s = SUN4V_RTC(dev);
  76
  77    memory_region_init_io(&s->iomem, OBJECT(s), &sun4v_rtc_ops, s,
  78                          "sun4v-rtc", 0x08ULL);
  79    sysbus_init_mmio(dev, &s->iomem);
  80    return 0;
  81}
  82
  83static void sun4v_rtc_class_init(ObjectClass *klass, void *data)
  84{
  85    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
  86
  87    k->init = sun4v_rtc_init1;
  88}
  89
  90static const TypeInfo sun4v_rtc_info = {
  91    .name          = TYPE_SUN4V_RTC,
  92    .parent        = TYPE_SYS_BUS_DEVICE,
  93    .instance_size = sizeof(Sun4vRtc),
  94    .class_init    = sun4v_rtc_class_init,
  95};
  96
  97static void sun4v_rtc_register_types(void)
  98{
  99    type_register_static(&sun4v_rtc_info);
 100}
 101
 102type_init(sun4v_rtc_register_types)
 103