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/* $NetBSD: obiofan.c,v 1.2 2021/09/11 16:29:18 macallan Exp $ */
/*-
* Copyright (c) 2021 Michael Lorenz
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <sys/callout.h>
#include <sys/time.h>
#include <dev/ofw/openfirm.h>
#include <dev/sysmon/sysmonvar.h>
#include <machine/autoconf.h>
#include <macppc/dev/obiovar.h>
#include "opt_obiofan.h"
#ifdef OBIOFAN_DEBUG
#define DPRINTF printf
#else
#define DPRINTF if (0) printf
#endif
struct obiofan_softc {
device_t sc_dev;
struct sysmon_envsys *sc_sme;
envsys_data_t sc_sensors[4];
callout_t sc_callout;
time_t sc_stamp;
int sc_node;
int sc_reg, sc_shift;
int sc_count, sc_rpm;
};
int obiofan_match(device_t, cfdata_t, void *);
void obiofan_attach(device_t, device_t, void *);
static void obiofan_refresh(struct sysmon_envsys *, envsys_data_t *);
static void obiofan_update(void *);
CFATTACH_DECL_NEW(obiofan, sizeof(struct obiofan_softc), obiofan_match,
obiofan_attach, NULL, NULL);
int
obiofan_match(device_t parent, cfdata_t match, void *aux)
{
struct confargs *ca = aux;
if (strcmp(ca->ca_name, "fans") == 0)
return 1;
return 0;
}
void
obiofan_attach(device_t parent, device_t self, void *aux)
{
struct obiofan_softc *sc = device_private(self);
struct confargs *ca = aux;
char descr[32] = "fan";
int node = ca->ca_node, tc_node;
int regs[8], tc_regs[32];
printf("\n");
if (OF_getprop(node, "reg", regs, sizeof(regs)) <= 0)
return;
sc->sc_node = node;
#ifdef OBIOFAN_DEBUG
int i;
for (i = 0; i < 7; i += 2)
printf("%02x: %08x\n", regs[i], obio_read_4(regs[i]));
#endif
tc_node = OF_parent(node);
if (OF_getprop(tc_node, "platform-do-getTACHCount", tc_regs, 32) <= 0) {
aprint_error("no platform-do-getTACHCount\n");
return;
}
/*
* XXX this is guesswork based on poking around & observation
*
* the parameter format seems to be:
* reg[0] - node number for the fan, or pointer into OF space
* reg[1] - 0x08000000
* reg[2] - 0x0000001a - varies with different platform-do-*
* reg[3] - register number in obio space
* reg[4] - bitmask in the register
* reg[5] - unknown
* reg[6] - unknown
*
* for now only get the parameters for the 1st fan since that's all we
* have on my 7,3
*/
sc->sc_reg = tc_regs[3];
sc->sc_shift = ffs(tc_regs[4]) - 1;
OF_getprop(tc_regs[0], "location", descr, 32);
DPRINTF("%s: %02x %d\n", descr, sc->sc_reg, sc->sc_shift);
sc->sc_stamp = time_second;
sc->sc_count = obio_read_4(sc->sc_reg) >> sc->sc_shift;
sc->sc_rpm = -1;
sc->sc_sme = sysmon_envsys_create();
sc->sc_sme->sme_name = device_xname(self);
sc->sc_sme->sme_cookie = sc;
sc->sc_sme->sme_refresh = obiofan_refresh;
sc->sc_sensors[0].units = ENVSYS_SFANRPM;
sc->sc_sensors[0].state = ENVSYS_SINVALID;
strcpy(sc->sc_sensors[0].desc, descr);
sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensors[0]);
sysmon_envsys_register(sc->sc_sme);
callout_init(&sc->sc_callout, 0);
callout_setfunc(&sc->sc_callout, obiofan_update, sc);
callout_schedule(&sc->sc_callout, mstohz(5000));
}
static void
obiofan_update(void *cookie)
{
struct obiofan_softc *sc = cookie;
time_t now = time_second, diff;
int spin, spins;
diff = now - sc->sc_stamp;
if (diff < 5) return;
spin = obio_read_4(sc->sc_reg) >> sc->sc_shift;
spins = (spin - sc->sc_count) & 0xffff;
sc->sc_rpm = spins * 60 / diff;
sc->sc_count = spin;
sc->sc_stamp = now;
DPRINTF("%s %lld %d\n", __func__, diff, spins);
callout_schedule(&sc->sc_callout, mstohz(5000));
}
static void
obiofan_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
struct obiofan_softc *sc = sme->sme_cookie;
if (sc->sc_rpm >= 0) {
edata->state = ENVSYS_SVALID;
edata->value_cur = sc->sc_rpm;
}
}
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