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
  30 typedef struct Sun4vRtc {
  31     SysBusDevice parent_obj;
  32
  33     MemoryRegion iomem;
  34 } Sun4vRtc;
  35
  36 static 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
  48 static 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
  54 static const MemoryRegionOps sun4v_rtc_ops = {
  55     .read = sun4v_rtc_read,
  56     .write = sun4v_rtc_write,
  57     .endianness = DEVICE_NATIVE_ENDIAN,
  58 };
  59
  60 void 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
  73 static 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
  83 static 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
  90 static 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
  97 static void sun4v_rtc_register_types(void)
  98 {
  99     type_register_static(&sun4v_rtc_info);
 100 }
 101
 102 type_init(sun4v_rtc_register_types)