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 typedef struct Sun4vRtc Sun4vRtc; 24 DECLARE_INSTANCE_CHECKER(Sun4vRtc, SUN4V_RTC, 25 TYPE_SUN4V_RTC) 26 27 struct Sun4vRtc { 28 SysBusDevice parent_obj; 29 30 MemoryRegion iomem; 31 }; 32 33 static uint64_t sun4v_rtc_read(void *opaque, hwaddr addr, 34 unsigned size) 35 { 36 uint64_t val = get_clock_realtime() / NANOSECONDS_PER_SECOND; 37 if (!(addr & 4ULL)) { 38 /* accessing the high 32 bits */ 39 val >>= 32; 40 } 41 trace_sun4v_rtc_read(addr, val); 42 return val; 43 } 44 45 static void sun4v_rtc_write(void *opaque, hwaddr addr, 46 uint64_t val, unsigned size) 47 { 48 trace_sun4v_rtc_write(addr, val); 49 } 50 51 static const MemoryRegionOps sun4v_rtc_ops = { 52 .read = sun4v_rtc_read, 53 .write = sun4v_rtc_write, 54 .endianness = DEVICE_NATIVE_ENDIAN, 55 }; 56 57 void sun4v_rtc_init(hwaddr addr) 58 { 59 DeviceState *dev; 60 SysBusDevice *s; 61 62 dev = qdev_new(TYPE_SUN4V_RTC); 63 s = SYS_BUS_DEVICE(dev); 64 65 sysbus_realize_and_unref(s, &error_fatal); 66 67 sysbus_mmio_map(s, 0, addr); 68 } 69 70 static void sun4v_rtc_realize(DeviceState *dev, Error **errp) 71 { 72 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 73 Sun4vRtc *s = SUN4V_RTC(dev); 74 75 memory_region_init_io(&s->iomem, OBJECT(s), &sun4v_rtc_ops, s, 76 "sun4v-rtc", 0x08ULL); 77 sysbus_init_mmio(sbd, &s->iomem); 78 } 79 80 static void sun4v_rtc_class_init(ObjectClass *klass, void *data) 81 { 82 DeviceClass *dc = DEVICE_CLASS(klass); 83 84 dc->realize = sun4v_rtc_realize; 85 } 86 87 static const TypeInfo sun4v_rtc_info = { 88 .name = TYPE_SUN4V_RTC, 89 .parent = TYPE_SYS_BUS_DEVICE, 90 .instance_size = sizeof(Sun4vRtc), 91 .class_init = sun4v_rtc_class_init, 92 }; 93 94 static void sun4v_rtc_register_types(void) 95 { 96 type_register_static(&sun4v_rtc_info); 97 } 98 99 type_init(sun4v_rtc_register_types) 100