tegra210_coretemp.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright 2020 Michal Meloun <mmel@FreeBSD.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/bus.h>
   34 #include <sys/cpu.h>
   35 #include <sys/kernel.h>
   36 #include <sys/lock.h>
   37 #include <sys/malloc.h>
   38 #include <sys/module.h>
   39 #include <sys/sysctl.h>
   40 
   41 #include <machine/bus.h>
   42 #include <machine/cpu.h>
   43 
   44 #include <dev/extres/clk/clk.h>
   45 #include <dev/ofw/ofw_bus_subr.h>
   46 
   47 #include "tegra_soctherm_if.h"
   48 
   49 
   50 enum therm_info {
   51         CORETEMP_TEMP,
   52         CORETEMP_DELTA,
   53         CORETEMP_RESOLUTION,
   54         CORETEMP_TJMAX,
   55 };
   56 
   57 struct tegra210_coretemp_softc {
   58         device_t                dev;
   59         int                     overheat_log;
   60         int                     core_max_temp;
   61         int                     cpu_id;
   62         device_t                tsens_dev;
   63         intptr_t                tsens_id;
   64 };
   65 
   66 static int
   67 coretemp_get_val_sysctl(SYSCTL_HANDLER_ARGS)
   68 {
   69         device_t dev;
   70         int val, temp, rv;
   71         struct tegra210_coretemp_softc *sc;
   72         enum therm_info type;
   73         char stemp[16];
   74 
   75 
   76         dev = (device_t) arg1;
   77         sc = device_get_softc(dev);
   78         type = arg2;
   79 
   80 
   81         rv = TEGRA_SOCTHERM_GET_TEMPERATURE(sc->tsens_dev, sc->dev,
   82              sc->tsens_id, &temp);
   83         if (rv != 0) {
   84                 device_printf(sc->dev,
   85                     "Cannot read temperature sensor %u:  %d\n",
   86                     (unsigned int)sc->tsens_id, rv);
   87                 return (rv);
   88         }
   89 
   90         switch (type) {
   91         case CORETEMP_TEMP:
   92                 val = temp / 100;
   93                 val +=  2731;
   94                 break;
   95         case CORETEMP_DELTA:
   96                 val = (sc->core_max_temp - temp) / 1000;
   97                 break;
   98         case CORETEMP_RESOLUTION:
   99                 val = 1;
  100                 break;
  101         case CORETEMP_TJMAX:
  102                 val = sc->core_max_temp / 100;
  103                 val +=  2731;
  104                 break;
  105         }
  106 
  107 
  108         if ((temp > sc->core_max_temp)  && !sc->overheat_log) {
  109                 sc->overheat_log = 1;
  110 
  111                 /*
  112                  * Check for Critical Temperature Status and Critical
  113                  * Temperature Log.  It doesn't really matter if the
  114                  * current temperature is invalid because the "Critical
  115                  * Temperature Log" bit will tell us if the Critical
  116                  * Temperature has * been reached in past. It's not
  117                  * directly related to the current temperature.
  118                  *
  119                  * If we reach a critical level, allow devctl(4)
  120                  * to catch this and shutdown the system.
  121                  */
  122                 device_printf(dev, "critical temperature detected, "
  123                     "suggest system shutdown\n");
  124                 snprintf(stemp, sizeof(stemp), "%d", val);
  125                 devctl_notify("coretemp", "Thermal", stemp,
  126                     "notify=0xcc");
  127         } else {
  128                 sc->overheat_log = 0;
  129         }
  130 
  131         return (sysctl_handle_int(oidp, 0, val, req));
  132 }
  133 
  134 static int
  135 tegra210_coretemp_ofw_parse(struct tegra210_coretemp_softc *sc)
  136 {
  137         int rv, ncells;
  138         phandle_t node, xnode;
  139         pcell_t *cells;
  140 
  141         node = OF_peer(0);
  142         node = ofw_bus_find_child(node, "thermal-zones");
  143         if (node <= 0) {
  144                 device_printf(sc->dev, "Cannot find 'thermal-zones'.\n");
  145                 return (ENXIO);
  146         }
  147 
  148         node = ofw_bus_find_child(node, "cpu");
  149         if (node <= 0) {
  150                 device_printf(sc->dev, "Cannot find 'cpu'\n");
  151                 return (ENXIO);
  152         }
  153         rv = ofw_bus_parse_xref_list_alloc(node, "thermal-sensors",
  154             "#thermal-sensor-cells", 0, &xnode, &ncells, &cells);
  155         if (rv != 0) {
  156                 device_printf(sc->dev,
  157                     "Cannot parse 'thermal-sensors' property.\n");
  158                 return (ENXIO);
  159         }
  160         if (ncells != 1) {
  161                 device_printf(sc->dev,
  162                     "Invalid format of 'thermal-sensors' property(%d).\n",
  163                     ncells);
  164                 return (ENXIO);
  165         }
  166 
  167         sc->tsens_id = 0x100 + sc->cpu_id;
  168         OF_prop_free(cells);
  169 
  170         sc->tsens_dev = OF_device_from_xref(xnode);
  171         if (sc->tsens_dev == NULL) {
  172                 device_printf(sc->dev,
  173                     "Cannot find thermal sensors device.");
  174                 return (ENXIO);
  175         }
  176         return (0);
  177 }
  178 
  179 static void
  180 tegra210_coretemp_identify(driver_t *driver, device_t parent)
  181 {
  182         phandle_t root;
  183 
  184         root = OF_finddevice("/");
  185         if (!ofw_bus_node_is_compatible(root, "nvidia,tegra210"))
  186                 return;
  187         if (device_find_child(parent, "tegra210_coretemp", -1) != NULL)
  188                 return;
  189         if (BUS_ADD_CHILD(parent, 0, "tegra210_coretemp", -1) == NULL)
  190                 device_printf(parent, "add child failed\n");
  191 }
  192 
  193 static int
  194 tegra210_coretemp_probe(device_t dev)
  195 {
  196 
  197         device_set_desc(dev, "CPU Thermal Sensor");
  198         return (0);
  199 }
  200 
  201 static int
  202 tegra210_coretemp_attach(device_t dev)
  203 {
  204         struct tegra210_coretemp_softc *sc;
  205         device_t pdev;
  206         struct sysctl_oid *oid;
  207         struct sysctl_ctx_list *ctx;
  208         int rv;
  209 
  210         sc = device_get_softc(dev);
  211         sc->dev = dev;
  212         sc->cpu_id = device_get_unit(dev);
  213         sc->core_max_temp = 102000;
  214         pdev = device_get_parent(dev);
  215 
  216         rv = tegra210_coretemp_ofw_parse(sc);
  217         if (rv != 0)
  218                 return (rv);
  219 
  220         ctx = device_get_sysctl_ctx(dev);
  221 
  222         oid = SYSCTL_ADD_NODE(ctx,
  223             SYSCTL_CHILDREN(device_get_sysctl_tree(pdev)), OID_AUTO,
  224             "coretemp", CTLFLAG_RD, NULL, "Per-CPU thermal information");
  225 
  226         /*
  227          * Add the MIBs to dev.cpu.N and dev.cpu.N.coretemp.
  228          */
  229         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(pdev)),
  230             OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
  231             dev, CORETEMP_TEMP, coretemp_get_val_sysctl, "IK",
  232             "Current temperature");
  233         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "delta",
  234             CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, CORETEMP_DELTA,
  235             coretemp_get_val_sysctl, "I",
  236             "Delta between TCC activation and current temperature");
  237         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "resolution",
  238             CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, CORETEMP_RESOLUTION,
  239             coretemp_get_val_sysctl, "I",
  240             "Resolution of CPU thermal sensor");
  241         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "tjmax",
  242             CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, CORETEMP_TJMAX,
  243             coretemp_get_val_sysctl, "IK",
  244             "TCC activation temperature");
  245 
  246         return (0);
  247 }
  248 
  249 static int
  250 tegra210_coretemp_detach(device_t dev)
  251 {
  252         return (0);
  253 }
  254 
  255 static device_method_t tegra210_coretemp_methods[] = {
  256         /* Device interface */
  257         DEVMETHOD(device_identify,      tegra210_coretemp_identify),
  258         DEVMETHOD(device_probe,         tegra210_coretemp_probe),
  259         DEVMETHOD(device_attach,        tegra210_coretemp_attach),
  260         DEVMETHOD(device_detach,        tegra210_coretemp_detach),
  261 
  262         DEVMETHOD_END
  263 };
  264 
  265 static DEFINE_CLASS_0(tegra210_coretemp, tegra210_coretemp_driver,
  266     tegra210_coretemp_methods, sizeof(struct tegra210_coretemp_softc));
  267 DRIVER_MODULE(tegra210_coretemp, cpu, tegra210_coretemp_driver, NULL, NULL);

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FreeBSD/Linux Kernel Cross Reference sys/arm64/nvidia/tegra210/tegra210_coretemp.c

FreeBSD/Linux Kernel Cross Reference
sys/arm64/nvidia/tegra210/tegra210_coretemp.c