--- /dev/null
+/* $OpenBSD: stftemp.c,v 1.1 2022/06/12 10:51:55 kettenis Exp $ */
+/*
+ * Copyright (c) 2022 Mark Kettenis <kettenis@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/sensors.h>
+
+#include <machine/intr.h>
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_clock.h>
+#include <dev/ofw/ofw_thermal.h>
+#include <dev/ofw/fdt.h>
+
+/* Registers */
+#define TEMP 0x0000
+#define TEMP_PD (1 << 1)
+#define TEMP_RSTN (1 << 0)
+#define TEMP_RUN (1 << 2)
+#define TEMP_DOUT_MASK 0x0fff0000
+#define TEMP_DOUT_SHIFT 16
+
+#define HREAD4(sc, reg) \
+ (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
+#define HWRITE4(sc, reg, val) \
+ bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
+
+struct stftemp_softc {
+ struct device sc_dev;
+ bus_space_tag_t sc_iot;
+ bus_space_handle_t sc_ioh;
+
+ struct ksensor sc_sensor;
+ struct ksensordev sc_sensordev;
+
+ struct thermal_sensor sc_ts;
+};
+
+int stftemp_match(struct device *, void *, void *);
+void stftemp_attach(struct device *, struct device *, void *);
+
+const struct cfattach stftemp_ca = {
+ sizeof (struct stftemp_softc), stftemp_match, stftemp_attach
+};
+
+struct cfdriver stftemp_cd = {
+ NULL, "stftemp", DV_DULL
+};
+
+void stftemp_refresh_sensors(void *);
+int32_t stftemp_get_temperature(void *, uint32_t *);
+
+int
+stftemp_match(struct device *parent, void *match, void *aux)
+{
+ struct fdt_attach_args *faa = aux;
+
+ return OF_is_compatible(faa->fa_node, "starfive,jh7100-temp");
+}
+
+void
+stftemp_attach(struct device *parent, struct device *self, void *aux)
+{
+ struct stftemp_softc *sc = (struct stftemp_softc *)self;
+ struct fdt_attach_args *faa = aux;
+
+ if (faa->fa_nreg < 1) {
+ printf(": no registers\n");
+ return;
+ }
+
+ sc->sc_iot = faa->fa_iot;
+ if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
+ faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
+ printf(": can't map registers\n");
+ return;
+ }
+
+ printf("\n");
+
+ clock_enable(faa->fa_node, "bus");
+ reset_deassert(faa->fa_node, "bus");
+
+ clock_enable(faa->fa_node, "sense");
+ reset_deassert(faa->fa_node, "sense");
+
+ /* Power down */
+ HWRITE4(sc, TEMP, TEMP_PD);
+ delay(1);
+
+ /* Power up with reset asserted */
+ HWRITE4(sc, TEMP, 0);
+ delay(60);
+
+ /* Deassert reset */
+ HWRITE4(sc, TEMP, TEMP_RSTN);
+ delay(1);
+
+ /* Start measuring */
+ HWRITE4(sc, TEMP, TEMP_RSTN | TEMP_RUN);
+
+ /* Register sensor */
+ strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
+ sizeof(sc->sc_sensordev.xname));
+ sc->sc_sensor.type = SENSOR_TEMP;
+ sc->sc_sensor.flags = SENSOR_FINVALID;
+ sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
+ sensordev_install(&sc->sc_sensordev);
+ sensor_task_register(sc, stftemp_refresh_sensors, 5);
+
+ sc->sc_ts.ts_node = faa->fa_node;
+ sc->sc_ts.ts_cookie = sc;
+ sc->sc_ts.ts_get_temperature = stftemp_get_temperature;
+ thermal_sensor_register(&sc->sc_ts);
+}
+
+int32_t
+stftemp_get_temp(struct stftemp_softc *sc)
+{
+ int32_t value;
+
+ value = HREAD4(sc, TEMP);
+ value = (value & TEMP_DOUT_MASK) >> TEMP_DOUT_SHIFT;
+
+ return (value * 237500) / 4094 - 81100;
+}
+
+void
+stftemp_refresh_sensors(void *arg)
+{
+ struct stftemp_softc *sc = arg;
+
+ sc->sc_sensor.value = 273150000 + 1000 * stftemp_get_temp(sc);
+ sc->sc_sensor.flags &= ~SENSOR_FINVALID;
+}
+
+int32_t
+stftemp_get_temperature(void *cookie, uint32_t *cells)
+{
+ return stftemp_get_temp(cookie);
+}
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