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/*-
* Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
* 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 AUTHOR ``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 AUTHOR 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.
*
* $FreeBSD$
*/
/*
* Allwinner thermal sensor controller
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/module.h>
#include <machine/bus.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/allwinner/aw_sid.h>
#define THS_CTRL0 0x00
#define THS_CTRL2 0x40
#define SENSOR_ACQ1_SHIFT 16
#define SENSOR2_EN (1 << 2)
#define SENSOR1_EN (1 << 1)
#define SENSOR0_EN (1 << 0)
#define THS_INTC 0x44
#define THS_INTS 0x48
#define THS_FILTER 0x70
#define FILTER_EN (1 << 2)
#define THS_CALIB0 0x74
#define THS_CALIB1 0x78
#define THS_DATA0 0x80
#define THS_DATA1 0x84
#define THS_DATA2 0x88
#define DATA_MASK 0xfff
#define TEMP_BASE 2719
#define TEMP_MUL 1000
#define TEMP_DIV 14186
#define TEMP_TO_K 273
#define ADC_ACQUIRE_TIME (24 - 1)
#define SENSOR_ENABLE_ALL (SENSOR0_EN|SENSOR1_EN|SENSOR2_EN)
enum aw_thermal_sensor {
THS_SENSOR_CPU_CLUSTER0,
THS_SENSOR_CPU_CLUSTER1,
THS_SENSOR_GPU,
THS_SENSOR_END = -1
};
struct aw_thermal_sensor_config {
enum aw_thermal_sensor sensor;
const char *name;
const char *desc;
};
static const struct aw_thermal_sensor_config a83t_sensor_config[] = {
{ .sensor = THS_SENSOR_CPU_CLUSTER0,
.name = "cluster0", .desc = "CPU cluster 0 temperature" },
{ .sensor = THS_SENSOR_CPU_CLUSTER1,
.name = "cluster1", .desc = "CPU cluster 1 temperature" },
{ .sensor = THS_SENSOR_GPU,
.name = "gpu", .desc = "GPU temperature" },
{ .sensor = THS_SENSOR_END }
};
static struct ofw_compat_data compat_data[] = {
{ "allwinner,sun8i-a83t-ts", (uintptr_t)&a83t_sensor_config },
{ NULL, (uintptr_t)NULL }
};
#define THS_CONF(d) \
(void *)ofw_bus_search_compatible((d), compat_data)->ocd_data
struct aw_thermal_softc {
struct resource *res;
struct aw_thermal_sensor_config *conf;
};
static struct resource_spec aw_thermal_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ -1, 0 }
};
#define RD4(sc, reg) bus_read_4((sc)->res, (reg))
#define WR4(sc, reg, val) bus_write_4((sc)->res, (reg), (val))
static int
aw_thermal_init(struct aw_thermal_softc *sc)
{
uint32_t calib0, calib1;
int error;
/* Read calibration settings from SRAM */
error = aw_sid_read_tscalib(&calib0, &calib1);
if (error != 0)
return (error);
/* Write calibration settings to thermal controller */
WR4(sc, THS_CALIB0, calib0);
WR4(sc, THS_CALIB1, calib1);
/* Configure ADC acquire time (CLK_IN/(N+1)) and enable sensors */
WR4(sc, THS_CTRL0, ADC_ACQUIRE_TIME);
WR4(sc, THS_CTRL2, (ADC_ACQUIRE_TIME << SENSOR_ACQ1_SHIFT) |
SENSOR_ENABLE_ALL);
/* Disable interrupts */
WR4(sc, THS_INTC, 0);
WR4(sc, THS_INTS, RD4(sc, THS_INTS));
/* Enable average filter */
WR4(sc, THS_FILTER, RD4(sc, THS_FILTER) | FILTER_EN);
return (0);
}
static int
aw_thermal_gettemp(uint32_t val)
{
int raw;
raw = val & DATA_MASK;
return (((TEMP_BASE - raw) * TEMP_MUL) / TEMP_DIV) + TEMP_TO_K;
}
static int
aw_thermal_sysctl(SYSCTL_HANDLER_ARGS)
{
struct aw_thermal_softc *sc;
enum aw_thermal_sensor sensor;
int val;
sc = arg1;
sensor = arg2;
val = aw_thermal_gettemp(RD4(sc, THS_DATA0 + (sensor * 4)));
return sysctl_handle_opaque(oidp, &val, sizeof(val), req);
}
static int
aw_thermal_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (THS_CONF(dev) == NULL)
return (ENXIO);
device_set_desc(dev, "Allwinner Thermal Sensor Controller");
return (BUS_PROBE_DEFAULT);
}
static int
aw_thermal_attach(device_t dev)
{
struct aw_thermal_softc *sc;
int i;
sc = device_get_softc(dev);
sc->conf = THS_CONF(dev);
if (bus_alloc_resources(dev, aw_thermal_spec, &sc->res) != 0) {
device_printf(dev, "cannot allocate resources for device\n");
return (ENXIO);
}
if (aw_thermal_init(sc) != 0)
return (ENXIO);
for (i = 0; sc->conf[i].sensor != THS_SENSOR_END; i++)
SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, sc->conf[i].name,
CTLTYPE_INT | CTLFLAG_RD,
sc, sc->conf[i].sensor, aw_thermal_sysctl, "IK0",
sc->conf[i].desc);
return (0);
}
static device_method_t aw_thermal_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, aw_thermal_probe),
DEVMETHOD(device_attach, aw_thermal_attach),
DEVMETHOD_END
};
static driver_t aw_thermal_driver = {
"aw_thermal",
aw_thermal_methods,
sizeof(struct aw_thermal_softc),
};
static devclass_t aw_thermal_devclass;
DRIVER_MODULE(aw_thermal, simplebus, aw_thermal_driver, aw_thermal_devclass,
0, 0);
MODULE_VERSION(aw_thermal, 1);
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