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/* $OpenBSD: bcm2835_temp.c,v 1.1 2018/02/24 11:06:59 kettenis Exp $ */
/*
* Copyright (c) 2018 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/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
/* Registers */
#define TS_TSENSCTL 0x0000
#define TS_TSENSSTAT 0x0004
#define TS_TSENSSTAT_VALID (1 << 10)
#define TS_TSENSSTAT_DATA(x) ((x) & 0x3ff)
#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 bcmtemp_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
int32_t sc_slope;
int32_t sc_offset;
struct ksensor sc_sensor;
struct ksensordev sc_sensordev;
};
int bcmtemp_match(struct device *, void *, void *);
void bcmtemp_attach(struct device *, struct device *, void *);
struct cfattach bcmtemp_ca = {
sizeof (struct bcmtemp_softc), bcmtemp_match, bcmtemp_attach
};
struct cfdriver bcmtemp_cd = {
NULL, "bcmtemp", DV_DULL
};
void bcmtemp_refresh_sensors(void *);
int
bcmtemp_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "brcm,bcm2836-thermal") ||
OF_is_compatible(faa->fa_node, "brcm,bcm2837-thermal"));
}
void
bcmtemp_attach(struct device *parent, struct device *self, void *aux)
{
struct bcmtemp_softc *sc = (struct bcmtemp_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");
/* XXX fetch these from /thermal-zones. */
sc->sc_slope = -538;
if (OF_is_compatible(faa->fa_node, "brcm,bcm2836-thermal"))
sc->sc_offset = 407000;
else
sc->sc_offset = 412000;
/* Register sensors. */
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, bcmtemp_refresh_sensors, 5);
}
void
bcmtemp_refresh_sensors(void *arg)
{
struct bcmtemp_softc *sc = arg;
int32_t code, temp;
code = HREAD4(sc, TS_TSENSSTAT);
temp = sc->sc_offset + TS_TSENSSTAT_DATA(code) * sc->sc_slope;
sc->sc_sensor.value = 273150000 + 1000 * temp;
if (code & TS_TSENSSTAT_VALID)
sc->sc_sensor.flags &= ~SENSOR_FINVALID;
else
sc->sc_sensor.flags |= SENSOR_FINVALID;
}
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