1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
30  * initially for Android but now also used for RISC-V's virt machine.
32 …* https://android.googlesource.com/platform/external/qemu/+/master/docs/GOLDFISH-VIRTUAL-HARDWARE.…
70 	if (ofw_bus_is_compatible(dev, "google,goldfish-rtc")) {  in goldfish_rtc_probe()
85 	sc->rid = 0;  in goldfish_rtc_attach()
86 	sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,  in goldfish_rtc_attach()
88 	if (sc->res == NULL) {  in goldfish_rtc_attach()
93 	mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF);  in goldfish_rtc_attach()
96 	 * Register as a system realtime clock with 1 second resolution.  in goldfish_rtc_attach()
112 	mtx_destroy(&sc->mtx);  in goldfish_rtc_detach()
113 	bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);  in goldfish_rtc_detach()
122 	uint64_t low, high, nsec;  in goldfish_rtc_gettime()  local
127 	 * Reading TIME_HIGH is defined in the documentation to give the high  in goldfish_rtc_gettime()
131 	mtx_lock(&sc->mtx);  in goldfish_rtc_gettime()
132 	low = bus_read_4(sc->res, GOLDFISH_RTC_TIME_LOW);  in goldfish_rtc_gettime()
133 	high = bus_read_4(sc->res, GOLDFISH_RTC_TIME_HIGH);  in goldfish_rtc_gettime()
134 	mtx_unlock(&sc->mtx);  in goldfish_rtc_gettime()
136 	nsec = (high << 32) | low;  in goldfish_rtc_gettime()
137 	ts->tv_sec = nsec / 1000000000;  in goldfish_rtc_gettime()
138 	ts->tv_nsec = nsec % 1000000000;  in goldfish_rtc_gettime()
152 	 * We request a timespec with no resolution-adjustment.  That also  in goldfish_rtc_settime()
155 	ts->tv_sec -= utc_offset();  in goldfish_rtc_settime()
156 	nsec = (uint64_t)ts->tv_sec * 1000000000 + ts->tv_nsec;  in goldfish_rtc_settime()
158 	mtx_lock(&sc->mtx);  in goldfish_rtc_settime()
159 	bus_write_4(sc->res, GOLDFISH_RTC_TIME_HIGH, nsec >> 32);  in goldfish_rtc_settime()
160 	bus_write_4(sc->res, GOLDFISH_RTC_TIME_LOW, nsec);  in goldfish_rtc_settime()
161 	mtx_unlock(&sc->mtx);  in goldfish_rtc_settime()