/*      $OpenBSD: hitemp.c,v 1.3 2022/06/28 23:43:12 naddy 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 HI3660_OFFSET   0x040
#define HI3660_TEMP     0x01c
#define HI3660_TH       0x020
#define HI3660_LAG      0x028
#define HI3660_INT_EN   0x02c
#define HI3660_INT_CLR  0x030

#define HI3670_OFFSET   0x100
#define HI3670_INT_EN   0x064

#define HITEMP_NSENSORS 4

struct hitemp_softc {
        struct device           sc_dev;
        bus_space_tag_t         sc_iot;
        bus_space_handle_t      sc_ioh;

        bus_size_t              sc_offset;
        uint64_t                (*sc_calc_temp)(uint64_t);

        struct ksensor          sc_sensors[HITEMP_NSENSORS];
        struct ksensordev       sc_sensordev;
};

int     hitemp_match(struct device *, void *, void *);
void    hitemp_attach(struct device *, struct device *, void *);

const struct cfattach   hitemp_ca = {
        sizeof (struct hitemp_softc), hitemp_match, hitemp_attach
};

struct cfdriver hitemp_cd = {
        NULL, "hitemp", DV_DULL
};

struct hitemp_compat {
        const char *compat;
        bus_size_t offset;
        uint64_t (*calc_temp)(uint64_t);
};

uint64_t hi3660_calc_temp(uint64_t);
uint64_t hi3670_calc_temp(uint64_t);

const struct hitemp_compat hitemp_compat[] = {
        {
                "hsilicon,hi3660-tsensor",
                HI3660_OFFSET, hi3660_calc_temp
        },
        {
                "hisilicon,kirin970-tsensor",
                HI3670_OFFSET, hi3670_calc_temp
        }
};

void    hitemp_refresh_sensors(void *);

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

        for (i = 0; i < nitems(hitemp_compat); i++) {
                if (OF_is_compatible(faa->fa_node, hitemp_compat[i].compat))
                        return 1;
        }

        return 0;
}

void
hitemp_attach(struct device *parent, struct device *self, void *aux)
{
        struct hitemp_softc *sc = (struct hitemp_softc *)self;
        struct fdt_attach_args *faa = aux;
        int i;

        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");

        for (i = 0; i < nitems(hitemp_compat); i++) {
                if (OF_is_compatible(faa->fa_node, hitemp_compat[i].compat)) {
                        break;
                }
        }
        KASSERT(i < nitems(hitemp_compat));

        sc->sc_offset = hitemp_compat[i].offset;
        sc->sc_calc_temp = hitemp_compat[i].calc_temp;

        /* Register sensors. */
        strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
            sizeof(sc->sc_sensordev.xname));
        for (i = 0; i < HITEMP_NSENSORS; i++) {
                sc->sc_sensors[i].type = SENSOR_TEMP;
                sc->sc_sensors[i].flags = SENSOR_FINVALID;
                sensor_attach(&sc->sc_sensordev, &sc->sc_sensors[i]);
        }
        sensordev_install(&sc->sc_sensordev);
        sensor_task_register(sc, hitemp_refresh_sensors, 5);
}

uint64_t
hi3660_calc_temp(uint64_t value)
{
        return 273150000 - 63780000 + value * 205000;
}

uint64_t
hi3670_calc_temp(uint64_t value)
{
        return 273150000 - 73720000 + value * 216000;
}

void
hitemp_refresh_sensors(void *arg)
{
        struct hitemp_softc *sc = arg;
        bus_size_t offset = 0;
        uint32_t value;
        uint64_t temp;
        int i;

        for (i = 0; i < HITEMP_NSENSORS; i++) {
                value = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
                    offset + HI3660_TEMP);
                temp = sc->sc_calc_temp(value);
                sc->sc_sensors[i].value = temp;
                sc->sc_sensors[i].flags &= ~SENSOR_FINVALID;
                offset += sc->sc_offset;
        }
}