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