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 "qemu/module.h" 15 #include "qemu/timer.h" 16 #include "hw/rtc/sun4v-rtc.h" 17 #include "trace.h" 18 19 20 #define TYPE_SUN4V_RTC "sun4v_rtc" 21 #define SUN4V_RTC(obj) OBJECT_CHECK(Sun4vRtc, (obj), TYPE_SUN4V_RTC) 22 23 typedef struct Sun4vRtc { 24 SysBusDevice parent_obj; 25 26 MemoryRegion iomem; 27 } Sun4vRtc; 28 29 static uint64_t sun4v_rtc_read(void *opaque, hwaddr addr, 30 unsigned size) 31 { 32 uint64_t val = get_clock_realtime() / NANOSECONDS_PER_SECOND; 33 if (!(addr & 4ULL)) { 34 /* accessing the high 32 bits */ 35 val >>= 32; 36 } 37 trace_sun4v_rtc_read(addr, val); 38 return val; 39 } 40 41 static void sun4v_rtc_write(void *opaque, hwaddr addr, 42 uint64_t val, unsigned size) 43 { 44 trace_sun4v_rtc_write(addr, val); 45 } 46 47 static const MemoryRegionOps sun4v_rtc_ops = { 48 .read = sun4v_rtc_read, 49 .write = sun4v_rtc_write, 50 .endianness = DEVICE_NATIVE_ENDIAN, 51 }; 52 53 void sun4v_rtc_init(hwaddr addr) 54 { 55 DeviceState *dev; 56 SysBusDevice *s; 57 58 dev = qdev_create(NULL, TYPE_SUN4V_RTC); 59 s = SYS_BUS_DEVICE(dev); 60 61 qdev_init_nofail(dev); 62 63 sysbus_mmio_map(s, 0, addr); 64 } 65 66 static void sun4v_rtc_realize(DeviceState *dev, Error **errp) 67 { 68 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 69 Sun4vRtc *s = SUN4V_RTC(dev); 70 71 memory_region_init_io(&s->iomem, OBJECT(s), &sun4v_rtc_ops, s, 72 "sun4v-rtc", 0x08ULL); 73 sysbus_init_mmio(sbd, &s->iomem); 74 } 75 76 static void sun4v_rtc_class_init(ObjectClass *klass, void *data) 77 { 78 DeviceClass *dc = DEVICE_CLASS(klass); 79 80 dc->realize = sun4v_rtc_realize; 81 } 82 83 static const TypeInfo sun4v_rtc_info = { 84 .name = TYPE_SUN4V_RTC, 85 .parent = TYPE_SYS_BUS_DEVICE, 86 .instance_size = sizeof(Sun4vRtc), 87 .class_init = sun4v_rtc_class_init, 88 }; 89 90 static void sun4v_rtc_register_types(void) 91 { 92 type_register_static(&sun4v_rtc_info); 93 } 94 95 type_init(sun4v_rtc_register_types) 96