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 20 21 #define TYPE_SUN4V_RTC "sun4v_rtc" 22 #define SUN4V_RTC(obj) OBJECT_CHECK(Sun4vRtc, (obj), TYPE_SUN4V_RTC) 23 24 typedef struct Sun4vRtc { 25 SysBusDevice parent_obj; 26 27 MemoryRegion iomem; 28 } Sun4vRtc; 29 30 static uint64_t sun4v_rtc_read(void *opaque, hwaddr addr, 31 unsigned size) 32 { 33 uint64_t val = get_clock_realtime() / NANOSECONDS_PER_SECOND; 34 if (!(addr & 4ULL)) { 35 /* accessing the high 32 bits */ 36 val >>= 32; 37 } 38 trace_sun4v_rtc_read(addr, val); 39 return val; 40 } 41 42 static void sun4v_rtc_write(void *opaque, hwaddr addr, 43 uint64_t val, unsigned size) 44 { 45 trace_sun4v_rtc_write(addr, val); 46 } 47 48 static const MemoryRegionOps sun4v_rtc_ops = { 49 .read = sun4v_rtc_read, 50 .write = sun4v_rtc_write, 51 .endianness = DEVICE_NATIVE_ENDIAN, 52 }; 53 54 void sun4v_rtc_init(hwaddr addr) 55 { 56 DeviceState *dev; 57 SysBusDevice *s; 58 59 dev = qdev_new(TYPE_SUN4V_RTC); 60 s = SYS_BUS_DEVICE(dev); 61 62 sysbus_realize_and_unref(s, &error_fatal); 63 64 sysbus_mmio_map(s, 0, addr); 65 } 66 67 static void sun4v_rtc_realize(DeviceState *dev, Error **errp) 68 { 69 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 70 Sun4vRtc *s = SUN4V_RTC(dev); 71 72 memory_region_init_io(&s->iomem, OBJECT(s), &sun4v_rtc_ops, s, 73 "sun4v-rtc", 0x08ULL); 74 sysbus_init_mmio(sbd, &s->iomem); 75 } 76 77 static void sun4v_rtc_class_init(ObjectClass *klass, void *data) 78 { 79 DeviceClass *dc = DEVICE_CLASS(klass); 80 81 dc->realize = sun4v_rtc_realize; 82 } 83 84 static const TypeInfo sun4v_rtc_info = { 85 .name = TYPE_SUN4V_RTC, 86 .parent = TYPE_SYS_BUS_DEVICE, 87 .instance_size = sizeof(Sun4vRtc), 88 .class_init = sun4v_rtc_class_init, 89 }; 90 91 static void sun4v_rtc_register_types(void) 92 { 93 type_register_static(&sun4v_rtc_info); 94 } 95 96 type_init(sun4v_rtc_register_types) 97