2 * Copyright (c) 2012 Hiroki Sato <hrs@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * Driver for on-die thermal sensor in 88F6282 and 88F6283.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
37 #include <sys/sysctl.h>
38 #include <machine/fdt.h>
40 #include <dev/fdt/fdt_common.h>
41 #include <dev/ofw/ofw_bus.h>
42 #include <dev/ofw/ofw_bus_subr.h>
44 #include <arm/mv/mvreg.h>
45 #include <arm/mv/mvvar.h>
47 static struct resource_spec mvts_res[] = {
48 { SYS_RES_MEMORY, 0, RF_ACTIVE },
54 struct resource *sc_res[sizeof(mvts_res)];
58 ts_probe(device_t dev)
62 if (!ofw_bus_is_compatible(dev, "mrvl,ts"))
69 device_printf(dev, "unsupported SoC (ID: 0x%08X)!\n", d);
72 device_set_desc(dev, "Marvell Thermal Sensor");
77 #define MV_TEMP_VALID_BIT (1 << 9)
78 #define MV_TEMP_SENS_OFFS 10
79 #define MV_TEMP_SENS_MASK 0x1ff
80 #define MV_TEMP_SENS_READ_MAX 16
82 #define MV_TEMP_CONVERT(x) ((((322 - x) * 100000) / 13625) + TZ_ZEROC)
86 * 0000 0000 0000 0000 0000 0000 0000 0000
89 * ^--- temperature (9 bits)
93 ts_sysctl_handler(SYSCTL_HANDLER_ARGS)
95 struct mvts_softc *sc;
101 dev = (device_t)arg1;
102 sc = device_get_softc(dev);
105 ret = bus_read_4(sc->sc_res[0], 0);
106 if ((ret & MV_TEMP_VALID_BIT) == 0) {
107 device_printf(dev, "temperature sensor is broken.\n");
108 goto ts_sysctl_handle_int;
111 for (i = 0; i < MV_TEMP_SENS_READ_MAX; i++) {
112 ret = bus_read_4(sc->sc_res[0], 0);
113 ret = (ret >> MV_TEMP_SENS_OFFS) & MV_TEMP_SENS_MASK;
116 * Successive reads should returns the same value except
117 * for the LSB when the sensor is normal.
119 if (((ret0 ^ ret) & 0x1fe) == 0)
124 if (i == MV_TEMP_SENS_READ_MAX) {
125 device_printf(dev, "temperature sensor is unstable.\n");
126 goto ts_sysctl_handle_int;
128 val = (u_int)MV_TEMP_CONVERT(ret);
130 ts_sysctl_handle_int:
131 return (sysctl_handle_int(oidp, &val, 0, req));
135 ts_attach(device_t dev)
137 struct mvts_softc *sc;
138 struct sysctl_ctx_list *ctx;
141 sc = device_get_softc(dev);
143 error = bus_alloc_resources(dev, mvts_res, sc->sc_res);
145 device_printf(dev, "could not allocate resources\n");
148 ctx = device_get_sysctl_ctx(dev);
149 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
150 OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD, dev,
151 0, ts_sysctl_handler, "IK", "Current Temperature");
157 ts_detach(device_t dev)
163 static device_method_t ts_methods[] = {
164 DEVMETHOD(device_probe, ts_probe),
165 DEVMETHOD(device_attach, ts_attach),
166 DEVMETHOD(device_detach, ts_detach),
170 static driver_t ts_driver = {
173 sizeof(struct mvts_softc),
176 static devclass_t ts_devclass;
177 DRIVER_MODULE(mvts, simplebus, ts_driver, ts_devclass, 0, 0);
178 MODULE_VERSION(mvts, 1);