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 struct tegra210_coretemp_softc *sc; 253 254 sc = device_get_softc(dev); 255 return (0); 256 } 257 258 static device_method_t tegra210_coretemp_methods[] = { 259 /* Device interface */ 260 DEVMETHOD(device_identify, tegra210_coretemp_identify), 261 DEVMETHOD(device_probe, tegra210_coretemp_probe), 262 DEVMETHOD(device_attach, tegra210_coretemp_attach), 263 DEVMETHOD(device_detach, tegra210_coretemp_detach), 264 265 DEVMETHOD_END 266 }; 267 268 static devclass_t tegra210_coretemp_devclass; 269 static DEFINE_CLASS_0(tegra210_coretemp, tegra210_coretemp_driver, 270 tegra210_coretemp_methods, sizeof(struct tegra210_coretemp_softc)); 271 DRIVER_MODULE(tegra210_coretemp, cpu, tegra210_coretemp_driver, 272 tegra210_coretemp_devclass, NULL, NULL); 273