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/*
* Copyright (c) 2014 Patrick Wildt <patrick@blueri.se>
* Copyright (c) 2016 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/queue.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/evcount.h>
#include <sys/sensors.h>
#include <sys/socket.h>
#include <sys/timeout.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <armv7/armv7/armv7var.h>
#include <armv7/imx/imxocotpvar.h>
#include <armv7/imx/imxccmvar.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
/* registers */
#define TEMPMON_TEMPSENSE0 0x180
#define TEMPMON_TEMPSENSE0_SET 0x184
#define TEMPMON_TEMPSENSE0_CLR 0x188
#define TEMPMON_TEMPSENSE0_TOG 0x18c
#define TEMPMON_TEMPSENSE1 0x190
#define TEMPMON_TEMPSENSE1_SET 0x194
#define TEMPMON_TEMPSENSE1_CLR 0x198
#define TEMPMON_TEMPSENSE1_TOG 0x19c
/* bits and bytes */
#define TEMPMON_TEMPSENSE0_POWER_DOWN (1 << 0)
#define TEMPMON_TEMPSENSE0_MEASURE_TEMP (1 << 1)
#define TEMPMON_TEMPSENSE0_FINISHED (1 << 2)
#define TEMPMON_TEMPSENSE0_TEMP_CNT_MASK 0xfff
#define TEMPMON_TEMPSENSE0_TEMP_CNT_SHIFT 8
#define TEMPMON_TEMPSENSE0_ALARM_VALUE_MASK 0xfff
#define TEMPMON_TEMPSENSE0_ALARM_VALUE_SHIFT 20
/* calibration */
#define OCOTP_ANA1_HOT_TEMP_MASK 0xff
#define OCOTP_ANA1_HOT_TEMP_SHIFT 0
#define OCOTP_ANA1_HOT_COUNT_MASK 0xfff
#define OCOTP_ANA1_HOT_COUNT_SHIFT 8
#define OCOTP_ANA1_ROOM_COUNT_MASK 0xfff
#define OCOTP_ANA1_ROOM_COUNT_SHIFT 20
#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))
#define HSET4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
#define HCLR4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
struct imxtemp_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
uint32_t sc_hot_count;
uint32_t sc_hot_temp;
uint32_t sc_room_count;
struct ksensor sc_sensor;
struct ksensordev sc_sensordev;
struct timeout sc_sensorto;
};
int imxtemp_match(struct device *, void *, void *);
void imxtemp_attach(struct device *, struct device *, void *);
struct cfattach imxtemp_ca = {
sizeof(struct imxtemp_softc), imxtemp_match, imxtemp_attach
};
struct cfdriver imxtemp_cd = {
NULL, "imxtemp", DV_DULL
};
void imxtemp_calibration(struct device *);
int32_t imxtemp_calc_temp(struct imxtemp_softc *, uint32_t);
void imxtemp_refresh_sensors(void *);
void imxtemp_pickup_sensors(void *);
int
imxtemp_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
if (OF_is_compatible(faa->fa_node, "fsl,imx6q-anatop"))
return 10; /* Must beat simplebus(4). */
return 0;
}
void
imxtemp_attach(struct device *parent, struct device *self, void *aux)
{
struct imxtemp_softc *sc = (struct imxtemp_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1)
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))
panic("%s: bus_space_map failed!", __func__);
printf("\n");
config_mountroot(self, imxtemp_calibration);
}
void
imxtemp_calibration(struct device *self)
{
struct imxtemp_softc *sc = (struct imxtemp_softc *)self;
uint32_t calibration;
calibration = imxocotp_get_temperature_calibration();
sc->sc_hot_count = (calibration >> OCOTP_ANA1_HOT_COUNT_SHIFT) &
OCOTP_ANA1_HOT_COUNT_MASK;
sc->sc_hot_temp = (calibration >> OCOTP_ANA1_HOT_TEMP_SHIFT) &
OCOTP_ANA1_HOT_TEMP_MASK;
sc->sc_room_count = (calibration >> OCOTP_ANA1_ROOM_COUNT_SHIFT) &
OCOTP_ANA1_ROOM_COUNT_MASK;
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
strlcpy(sc->sc_sensor.desc, "core",
sizeof(sc->sc_sensor.desc));
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);
timeout_set(&sc->sc_sensorto, imxtemp_pickup_sensors, sc);
sensor_task_register(sc, imxtemp_refresh_sensors, 5);
}
int32_t
imxtemp_calc_temp(struct imxtemp_softc *sc, uint32_t temp_cnt)
{
int32_t value;
/*
* Calculate the calibrated tempterature based on the equation
* provided in the i.MX6 reference manual:
*
* Tmeas = HOT_TEMP - (Nmeas - HOT_COUNT) * ((HOT_TEMP - 25.0) /
* (ROOM_COUNT - HOT_COUNT))
*
* Note that we calculate the temperature in uC to avoid loss
* of precision.
*/
value = ((sc->sc_hot_temp - 25) * 1000000) /
(sc->sc_room_count - sc->sc_hot_count);
value *= (temp_cnt - sc->sc_hot_count);
return ((sc->sc_hot_temp * 1000000) - value);
}
void
imxtemp_refresh_sensors(void *arg)
{
struct imxtemp_softc *sc = (struct imxtemp_softc *)arg;
timeout_del(&sc->sc_sensorto);
/* Power on temperature sensor. */
HCLR4(sc, TEMPMON_TEMPSENSE0, TEMPMON_TEMPSENSE0_POWER_DOWN);
HSET4(sc, TEMPMON_TEMPSENSE0, TEMPMON_TEMPSENSE0_MEASURE_TEMP);
/* It may require up to ~17us to complete a measurement. */
timeout_add_usec(&sc->sc_sensorto, 25);
}
void
imxtemp_pickup_sensors(void *arg)
{
struct imxtemp_softc *sc = (struct imxtemp_softc *)arg;
uint32_t value;
uint32_t temp_cnt;
value = HREAD4(sc, TEMPMON_TEMPSENSE0);
/* Power down temperature sensor. */
HCLR4(sc, TEMPMON_TEMPSENSE0, TEMPMON_TEMPSENSE0_MEASURE_TEMP);
HSET4(sc, TEMPMON_TEMPSENSE0, TEMPMON_TEMPSENSE0_POWER_DOWN);
if ((value & TEMPMON_TEMPSENSE0_FINISHED) == 0) {
sc->sc_sensor.flags |= SENSOR_FINVALID;
return;
}
temp_cnt = (value >> TEMPMON_TEMPSENSE0_TEMP_CNT_SHIFT) &
TEMPMON_TEMPSENSE0_TEMP_CNT_MASK;
sc->sc_sensor.value = imxtemp_calc_temp(sc, temp_cnt) + 273150000;
sc->sc_sensor.flags &= ~SENSOR_FINVALID;
}
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