268 lines
7.1 KiB
C
268 lines
7.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright 2020 Michal Meloun <mmel@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/cpu.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <dev/extres/clk/clk.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "tegra_soctherm_if.h"
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enum therm_info {
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CORETEMP_TEMP,
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CORETEMP_DELTA,
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CORETEMP_RESOLUTION,
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CORETEMP_TJMAX,
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};
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struct tegra210_coretemp_softc {
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device_t dev;
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int overheat_log;
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int core_max_temp;
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int cpu_id;
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device_t tsens_dev;
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intptr_t tsens_id;
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};
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static int
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coretemp_get_val_sysctl(SYSCTL_HANDLER_ARGS)
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{
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device_t dev;
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int val, temp, rv;
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struct tegra210_coretemp_softc *sc;
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enum therm_info type;
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char stemp[16];
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dev = (device_t) arg1;
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sc = device_get_softc(dev);
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type = arg2;
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rv = TEGRA_SOCTHERM_GET_TEMPERATURE(sc->tsens_dev, sc->dev,
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sc->tsens_id, &temp);
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if (rv != 0) {
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device_printf(sc->dev,
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"Cannot read temperature sensor %u: %d\n",
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(unsigned int)sc->tsens_id, rv);
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return (rv);
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}
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switch (type) {
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case CORETEMP_TEMP:
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val = temp / 100;
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val += 2731;
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break;
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case CORETEMP_DELTA:
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val = (sc->core_max_temp - temp) / 1000;
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break;
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case CORETEMP_RESOLUTION:
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val = 1;
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break;
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case CORETEMP_TJMAX:
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val = sc->core_max_temp / 100;
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val += 2731;
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break;
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}
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if ((temp > sc->core_max_temp) && !sc->overheat_log) {
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sc->overheat_log = 1;
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/*
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* Check for Critical Temperature Status and Critical
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* Temperature Log. It doesn't really matter if the
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* current temperature is invalid because the "Critical
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* Temperature Log" bit will tell us if the Critical
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* Temperature has * been reached in past. It's not
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* directly related to the current temperature.
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*
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* If we reach a critical level, allow devctl(4)
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* to catch this and shutdown the system.
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*/
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device_printf(dev, "critical temperature detected, "
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"suggest system shutdown\n");
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snprintf(stemp, sizeof(stemp), "%d", val);
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devctl_notify("coretemp", "Thermal", stemp,
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"notify=0xcc");
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} else {
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sc->overheat_log = 0;
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}
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return (sysctl_handle_int(oidp, 0, val, req));
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}
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static int
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tegra210_coretemp_ofw_parse(struct tegra210_coretemp_softc *sc)
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{
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int rv, ncells;
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phandle_t node, xnode;
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pcell_t *cells;
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node = OF_peer(0);
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node = ofw_bus_find_child(node, "thermal-zones");
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if (node <= 0) {
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device_printf(sc->dev, "Cannot find 'thermal-zones'.\n");
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return (ENXIO);
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}
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node = ofw_bus_find_child(node, "cpu");
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if (node <= 0) {
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device_printf(sc->dev, "Cannot find 'cpu'\n");
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return (ENXIO);
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}
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rv = ofw_bus_parse_xref_list_alloc(node, "thermal-sensors",
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"#thermal-sensor-cells", 0, &xnode, &ncells, &cells);
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if (rv != 0) {
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device_printf(sc->dev,
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"Cannot parse 'thermal-sensors' property.\n");
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return (ENXIO);
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}
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if (ncells != 1) {
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device_printf(sc->dev,
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"Invalid format of 'thermal-sensors' property(%d).\n",
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ncells);
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return (ENXIO);
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}
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sc->tsens_id = 0x100 + sc->cpu_id;
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OF_prop_free(cells);
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sc->tsens_dev = OF_device_from_xref(xnode);
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if (sc->tsens_dev == NULL) {
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device_printf(sc->dev,
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"Cannot find thermal sensors device.");
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return (ENXIO);
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}
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return (0);
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}
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static void
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tegra210_coretemp_identify(driver_t *driver, device_t parent)
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{
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phandle_t root;
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root = OF_finddevice("/");
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if (!ofw_bus_node_is_compatible(root, "nvidia,tegra210"))
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return;
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if (device_find_child(parent, "tegra210_coretemp", -1) != NULL)
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return;
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if (BUS_ADD_CHILD(parent, 0, "tegra210_coretemp", -1) == NULL)
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device_printf(parent, "add child failed\n");
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}
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static int
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tegra210_coretemp_probe(device_t dev)
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{
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device_set_desc(dev, "CPU Thermal Sensor");
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return (0);
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}
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static int
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tegra210_coretemp_attach(device_t dev)
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{
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struct tegra210_coretemp_softc *sc;
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device_t pdev;
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struct sysctl_oid *oid;
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struct sysctl_ctx_list *ctx;
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int rv;
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sc = device_get_softc(dev);
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sc->dev = dev;
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sc->cpu_id = device_get_unit(dev);
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sc->core_max_temp = 102000;
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pdev = device_get_parent(dev);
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rv = tegra210_coretemp_ofw_parse(sc);
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if (rv != 0)
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return (rv);
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ctx = device_get_sysctl_ctx(dev);
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oid = SYSCTL_ADD_NODE(ctx,
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SYSCTL_CHILDREN(device_get_sysctl_tree(pdev)), OID_AUTO,
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"coretemp", CTLFLAG_RD, NULL, "Per-CPU thermal information");
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/*
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* Add the MIBs to dev.cpu.N and dev.cpu.N.coretemp.
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*/
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(pdev)),
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OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
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dev, CORETEMP_TEMP, coretemp_get_val_sysctl, "IK",
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"Current temperature");
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "delta",
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CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, CORETEMP_DELTA,
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coretemp_get_val_sysctl, "I",
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"Delta between TCC activation and current temperature");
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "resolution",
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CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, CORETEMP_RESOLUTION,
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coretemp_get_val_sysctl, "I",
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"Resolution of CPU thermal sensor");
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "tjmax",
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CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, CORETEMP_TJMAX,
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coretemp_get_val_sysctl, "IK",
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"TCC activation temperature");
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return (0);
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}
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static int
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tegra210_coretemp_detach(device_t dev)
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{
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return (0);
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}
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static device_method_t tegra210_coretemp_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, tegra210_coretemp_identify),
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DEVMETHOD(device_probe, tegra210_coretemp_probe),
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DEVMETHOD(device_attach, tegra210_coretemp_attach),
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DEVMETHOD(device_detach, tegra210_coretemp_detach),
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DEVMETHOD_END
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};
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static DEFINE_CLASS_0(tegra210_coretemp, tegra210_coretemp_driver,
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tegra210_coretemp_methods, sizeof(struct tegra210_coretemp_softc));
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DRIVER_MODULE(tegra210_coretemp, cpu, tegra210_coretemp_driver, NULL, NULL);
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