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"
  23 OBJECT_DECLARE_SIMPLE_TYPE(Sun4vRtc, SUN4V_RTC)
  24
  25 struct Sun4vRtc {
  26     SysBusDevice parent_obj;
  27
  28     MemoryRegion iomem;
  29 };
  30
  31 static 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
  43 static void sun4v_rtc_write(void *opaque, hwaddr addr,
  44                              uint64_t val, unsigned size)
  45 {
  46     trace_sun4v_rtc_write(addr, val);
  47 }
  48
  49 static const MemoryRegionOps sun4v_rtc_ops = {
  50     .read = sun4v_rtc_read,
  51     .write = sun4v_rtc_write,
  52     .endianness = DEVICE_NATIVE_ENDIAN,
  53 };
  54
  55 void 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
  68 static 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
  78 static 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
  85 static 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
  92 static void sun4v_rtc_register_types(void)
  93 {
  94     type_register_static(&sun4v_rtc_info);
  95 }
  96
  97 type_init(sun4v_rtc_register_types)