/*	$OpenBSD: imxtmu.c,v 1.1 2019/08/27 12:51:57 patrick Exp $	*/
/*
 * Copyright (c) 2018 Patrick Wildt <patrick@blueri.se>
 *
 * 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/malloc.h>
#include <sys/device.h>
#include <sys/sensors.h>
#include <sys/timeout.h>

#include <machine/bus.h>
#include <machine/fdt.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>

/* registers */
#define TMU_TMR					0x000
#define  TMU_TMR_ME					(1U << 31)
#define  TMU_TMR_ALPF					(0x3 << 26)
#define  TMU_TMR_SENSOR(x)				(1 << (15 - (x)))
#define TMU_TMTMIR				0x008
#define  TMU_TMTMIR_DEFAULT				0xf
#define TMU_TIER				0x020
#define TMU_TTCFGR				0x080
#define TMU_TSCFGR				0x084
#define TMU_TRITSR(x)				(0x100 + ((x) * 0x10))
#define TMU_TTR0CR				0xf10
#define TMU_TTR1CR				0xf14
#define TMU_TTR2CR				0xf18
#define TMU_TTR3CR				0xf1c

#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 imxtmu_softc {
	struct device		sc_dev;
	bus_space_tag_t		sc_iot;
	bus_space_handle_t	sc_ioh;
	int			sc_sensorid;

	struct ksensor		sc_sensor;
	struct ksensordev	sc_sensordev;
	struct timeout		sc_sensorto;
};

int	imxtmu_match(struct device *, void *, void *);
void	imxtmu_attach(struct device *, struct device *, void *);
void	imxtmu_refresh_sensors(void *);

struct cfattach imxtmu_ca = {
	sizeof(struct imxtmu_softc), imxtmu_match, imxtmu_attach
};

struct cfdriver imxtmu_cd = {
	NULL, "imxtmu", DV_DULL
};

int
imxtmu_match(struct device *parent, void *match, void *aux)
{
	struct fdt_attach_args *faa = aux;

	return OF_is_compatible(faa->fa_node, "fsl,imx8mq-tmu");
}

void
imxtmu_attach(struct device *parent, struct device *self, void *aux)
{
	struct imxtmu_softc *sc = (struct imxtmu_softc *)self;
	struct fdt_attach_args *faa = aux;
	uint32_t range[4], *calibration;
	int i, len;

	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");

	/*
	 * XXX: This thermal unit can show temperatures per node, and
	 * XXX: the thermal-zones can reference this.  But since we do
	 * XXX: not register ourselves with such a infrastructure we can
	 * XXX: live with just extracting sensor 0: the CPU.
	 */
	sc->sc_sensorid = 0;

	HWRITE4(sc, TMU_TIER, 0);
	HWRITE4(sc, TMU_TMTMIR, TMU_TMTMIR_DEFAULT);
	HWRITE4(sc, TMU_TMR, 0);

	if (OF_getpropintarray(faa->fa_node, "fsl,tmu-range", range,
	    sizeof(range)) != sizeof(range))
		return;

	HWRITE4(sc, TMU_TTR0CR, range[0]);
	HWRITE4(sc, TMU_TTR1CR, range[1]);
	HWRITE4(sc, TMU_TTR2CR, range[2]);
	HWRITE4(sc, TMU_TTR3CR, range[3]);

	len = OF_getproplen(faa->fa_node, "fsl,tmu-calibration");
	if (len <= 0 || (len % 8) != 0)
		return;

	calibration = malloc(len, M_TEMP, M_WAITOK);
	OF_getpropintarray(faa->fa_node, "fsl,tmu-calibration", calibration,
	    len);
	for (i = 0; i < (len / 4); i += 2) {
		HWRITE4(sc, TMU_TTCFGR, calibration[i + 0]);
		HWRITE4(sc, TMU_TSCFGR, calibration[i + 1]);
	}
	free(calibration, M_TEMP, len);

	HWRITE4(sc, TMU_TMR, TMU_TMR_SENSOR(sc->sc_sensorid) |
	    TMU_TMR_ME | TMU_TMR_ALPF);

	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);
	sensor_task_register(sc, imxtmu_refresh_sensors, 5);
}

void
imxtmu_refresh_sensors(void *arg)
{
	struct imxtmu_softc *sc = (struct imxtmu_softc *)arg;
	uint32_t value;

	value = HREAD4(sc, TMU_TRITSR(sc->sc_sensorid));
	value = (value & 0xff) * 1000000;

	sc->sc_sensor.value = value + 273150000;
	sc->sc_sensor.flags &= ~SENSOR_FINVALID;
}