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 v2 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) 98