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/* $OpenBSD: sxits.c,v 1.1 2018/01/06 13:04:47 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/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
/* Registers */
#define TP_CTRL0 0x00
#define TP_CTRL0_ADC_CLK_DIVIDER(x) (((x) & 0x3) << 20)
#define TP_CTRL0_FS_DIV(x) (((x) & 0xf) << 16)
#define TP_CTRL0_TACQ(x) ((x) & 0xffff)
#define TP_CTRL1 0x04
#define TP_CTRL1_TP_MODE_EN (1 << 4)
#define TP_CTRL3 0x0c
#define TP_CTRL3_FILTER_EN (1 << 2)
#define TP_CTRL3_FILTER_TYPE(x) ((x) & 0x3)
#define TP_TPR 0x18
#define TP_TPR_TEMP_EN (1 << 16)
#define TP_TPR_TEMP_PER(x) ((x) & 0xffff)
#define TEMP_DATA 0x20
#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 sxits_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
uint16_t sc_offset;
uint16_t sc_scale;
struct ksensor sc_sensor;
struct ksensordev sc_sensordev;
};
int sxits_match(struct device *, void *, void *);
void sxits_attach(struct device *, struct device *, void *);
struct cfattach sxits_ca = {
sizeof (struct sxits_softc), sxits_match, sxits_attach
};
struct cfdriver sxits_cd = {
NULL, "sxits", DV_DULL
};
void sxits_refresh_sensors(void *);
int
sxits_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "allwinner,sun4i-a10-ts") ||
OF_is_compatible(faa->fa_node, "allwinner,sun5i-a13-ts"));
}
void
sxits_attach(struct device *parent, struct device *self, void *aux)
{
struct sxits_softc *sc = (struct sxits_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");
if (OF_is_compatible(faa->fa_node, "allwinner,sun4i-a10-ts")) {
sc->sc_offset = 1932;
sc->sc_scale = 133;
} else {
sc->sc_offset = 1447;
sc->sc_scale = 100;
}
/* Start data acquisition. */
HWRITE4(sc, TP_CTRL0, TP_CTRL0_ADC_CLK_DIVIDER(2) |
TP_CTRL0_FS_DIV(7) | TP_CTRL0_TACQ(63));
HWRITE4(sc, TP_CTRL1, TP_CTRL1_TP_MODE_EN);
HWRITE4(sc, TP_CTRL3, TP_CTRL3_FILTER_EN | TP_CTRL3_FILTER_TYPE(1));
HWRITE4(sc, TP_TPR, TP_TPR_TEMP_EN | TP_TPR_TEMP_PER(800));
/* 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, sxits_refresh_sensors, 5);
}
void
sxits_refresh_sensors(void *arg)
{
struct sxits_softc *sc = arg;
uint32_t data, temp;
data = HREAD4(sc, TEMP_DATA);
if (data == 0) {
sc->sc_sensor.flags |= SENSOR_FINVALID;
return;
}
temp = (data - sc->sc_offset) * sc->sc_scale;
sc->sc_sensor.value = temp * 1000 + 273150000;
sc->sc_sensor.flags &= ~SENSOR_FINVALID;
}
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