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/* $OpenBSD: stftemp.c,v 1.2 2023/07/01 08:20:38 jsing 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") ||
OF_is_compatible(faa->fa_node, "starfive,jh7110-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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