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/* $OpenBSD: amltemp.c,v 1.1 2020/01/14 16:56:32 kettenis Exp $ */
/*
* Copyright (c) 2020 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/ofw_clock.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/ofw_thermal.h>
#include <dev/ofw/fdt.h>
/* Calibration */
#define TS_CALIB_VALID_MASK 0x8c000000
#define TS_CALIB_SIGN_MASK 0x00008000
#define TS_CALIB_VALUE_MASK 0x000003ff
/* Registers */
#define TS_CFG_REG1 0x01
#define TS_CFG_REG1_ANA_EN_VCM (1 << 10)
#define TS_CFG_REG1_ANA_EN_VBG (1 << 9)
#define TS_CFG_REG1_FILTER_EN (1 << 5)
#define TS_CFG_REG1_DEM_EN (1 << 3)
#define TS_CFG_REG1_ANA_CH_SEL 3
#define TS_STAT0 0x10
#define TS_STAT0_CODE_MASK 0xffff
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg) << 2))
#define HWRITE4(sc, reg, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg) << 2, (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 amltemp_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
int sc_node;
int32_t sc_calib;
struct ksensor sc_sensor;
struct ksensordev sc_sensordev;
struct thermal_sensor sc_ts;
};
int amltemp_match(struct device *, void *, void *);
void amltemp_attach(struct device *, struct device *, void *);
struct cfattach amltemp_ca = {
sizeof (struct amltemp_softc), amltemp_match, amltemp_attach
};
struct cfdriver amltemp_cd = {
NULL, "amltemp", DV_DULL
};
void amltemp_attachhook(struct device *);
int32_t amltemp_calc_temp(struct amltemp_softc *, int32_t);
void amltemp_refresh_sensors(void *);
int32_t amltemp_get_temperature(void *, uint32_t *);
int
amltemp_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "amlogic,g12a-thermal");
}
void
amltemp_attach(struct device *parent, struct device *self, void *aux)
{
struct amltemp_softc *sc = (struct amltemp_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;
}
sc->sc_node = faa->fa_node;
printf("\n");
config_mountroot(self, amltemp_attachhook);
}
void
amltemp_attachhook(struct device *self)
{
struct amltemp_softc *sc = (struct amltemp_softc *)self;
struct regmap *rm;
bus_addr_t offset;
const char *name;
uint32_t ao_secure;
if (OF_is_compatible(sc->sc_node, "amlogic,g12a-cpu-thermal")) {
offset = 0x128;
name = "CPU";
} else if (OF_is_compatible(sc->sc_node, "amlogic,g12a-ddr-thermal")) {
offset = 0x0f0;
name = "DDR";
} else {
printf("%s: unknown sensor\n", sc->sc_dev.dv_xname);
return;
}
/* Extract calibration value. */
ao_secure = OF_getpropint(sc->sc_node, "amlogic,ao-secure", 0);
rm = regmap_byphandle(ao_secure);
if (rm == NULL) {
printf("%s: no calibration info\n", sc->sc_dev.dv_xname);
return;
}
sc->sc_calib = regmap_read_4(rm, offset);
if ((sc->sc_calib & TS_CALIB_VALID_MASK) == 0) {
printf("%s: invalid calibration\n", sc->sc_dev.dv_xname);
return;
}
if (sc->sc_calib & TS_CALIB_SIGN_MASK)
sc->sc_calib = ~(sc->sc_calib & TS_CALIB_VALUE_MASK) + 1;
else
sc->sc_calib = (sc->sc_calib & TS_CALIB_VALUE_MASK);
/* Enable hardware. */
clock_enable_all(sc->sc_node);
HSET4(sc, TS_CFG_REG1, TS_CFG_REG1_ANA_EN_VCM |
TS_CFG_REG1_ANA_EN_VBG | TS_CFG_REG1_FILTER_EN |
TS_CFG_REG1_DEM_EN | TS_CFG_REG1_ANA_CH_SEL);
/* Register sensor. */
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
strlcpy(sc->sc_sensor.desc, name, 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, amltemp_refresh_sensors, 5);
sc->sc_ts.ts_node = sc->sc_node;
sc->sc_ts.ts_cookie = sc;
sc->sc_ts.ts_get_temperature = amltemp_get_temperature;
thermal_sensor_register(&sc->sc_ts);
}
int32_t
amltemp_calc_temp(struct amltemp_softc *sc, int32_t code)
{
const uint32_t A = 9411;
const uint32_t B = 3159;
const uint32_t m = 424;
const uint32_t n = 324;
int64_t tmp1, tmp2;
tmp1 = (code * m) / 100;
tmp2 = (code * n) / 100;
tmp1 = (tmp1 * (1 << 16)) / ((1 << 16) + tmp2);
tmp1 = ((tmp1 + sc->sc_calib) * A) / (1 << 16);
return (tmp1 - B) * 100;
}
void
amltemp_refresh_sensors(void *arg)
{
struct amltemp_softc *sc = arg;
int32_t code, temp;
code = HREAD4(sc, TS_STAT0);
temp = amltemp_calc_temp(sc, code & TS_STAT0_CODE_MASK);
sc->sc_sensor.value = 273150000 + 1000 * temp;
sc->sc_sensor.flags &= ~SENSOR_FINVALID;
}
int32_t
amltemp_get_temperature(void *cookie, uint32_t *cells)
{
struct amltemp_softc *sc = cookie;
int32_t code;
code = HREAD4(sc, TS_STAT0);
return amltemp_calc_temp(sc, code & TS_STAT0_CODE_MASK);
}
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