1 /* $NetBSD: tda.c,v 1.4 2011/04/03 06:25:11 jdc Exp $ */ 2 /* $OpenBSD: tda.c,v 1.4 2008/02/27 17:25:00 robert Exp $ */ 3 4 /* 5 * Copyright (c) 2008 Robert Nagy <robert@openbsd.org> 6 * Copyright (c) 2008 Mark Kettenis <kettenis@openbsd.org> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include <sys/param.h> 22 #include <sys/systm.h> 23 #include <sys/kernel.h> 24 #include <sys/device.h> 25 #include <dev/sysmon/sysmonvar.h> 26 #include <dev/sysmon/sysmon_taskq.h> 27 28 #include <machine/autoconf.h> 29 #include <machine/openfirm.h> 30 31 #include <dev/i2c/i2cvar.h> 32 33 /* fan control registers */ 34 #define TDA_SYSFAN_REG 0xf0 35 #define TDA_CPUFAN_REG 0xf2 36 #define TDA_PSFAN_REG 0xf4 37 38 #define TDA_FANSPEED_MIN 0x0c 39 #define TDA_FANSPEED_MAX 0x3f 40 41 #define TDA_PSFAN_ON 0x1f 42 #define TDA_PSFAN_OFF 0x00 43 44 /* Internal and External temperature senor numbers */ 45 #define SENSOR_TEMP_EXT 0 46 #define SENSOR_TEMP_INT 1 47 48 #define CPU_TEMP_MAX (67 * 1000000 + 273150000) 49 #define CPU_TEMP_MIN (57 * 1000000 + 273150000) 50 #define SYS_TEMP_MAX (30 * 1000000 + 273150000) 51 #define SYS_TEMP_MIN (20 * 1000000 + 273150000) 52 53 struct tda_softc { 54 device_t sc_dev; 55 i2c_tag_t sc_tag; 56 i2c_addr_t sc_addr; 57 58 u_int16_t sc_cfan_speed; /* current CPU fan speed */ 59 u_int16_t sc_sfan_speed; /* current SYS fan speed */ 60 61 callout_t sc_timer; 62 }; 63 64 int tda_match(struct device *, struct cfdata *, void *); 65 void tda_attach(struct device *, struct device *, void *); 66 67 void tda_setspeed(struct tda_softc *); 68 static void tda_adjust(void *); 69 static void tda_timeout(void *); 70 71 72 CFATTACH_DECL_NEW(tda, sizeof(struct tda_softc), 73 tda_match, tda_attach, NULL, NULL); 74 75 int 76 tda_match(struct device *parent, struct cfdata *match, void *aux) 77 { 78 struct i2c_attach_args *ia = aux; 79 char name[32]; 80 81 /* Only attach on the Sun Blade 1000/2000. */ 82 if (OF_getprop(findroot(), "name", name, sizeof(name)) <= 0) 83 return (0); 84 if (strcmp(name, "SUNW,Sun-Blade-1000") != 0) 85 return (0); 86 87 /* 88 * No need for "compatible" matching, we know exactly what 89 * firmware calls us. 90 */ 91 if (ia->ia_name == NULL) 92 return(0); 93 return strcmp(ia->ia_name, "fan-control") == 0; 94 } 95 96 void 97 tda_attach(struct device *parent, struct device *self, void *aux) 98 { 99 struct tda_softc *sc = device_private(self); 100 struct i2c_attach_args *ia = aux; 101 102 sc->sc_dev = self; 103 sc->sc_tag = ia->ia_tag; 104 sc->sc_addr = ia->ia_addr; 105 106 aprint_normal(": %s\n", ia->ia_name); 107 aprint_naive(": Environment sensor\n"); 108 109 /* 110 * Set the fans to maximum speed and save the power levels; 111 * the controller is write-only. 112 */ 113 sc->sc_cfan_speed = sc->sc_sfan_speed = (TDA_FANSPEED_MAX+TDA_FANSPEED_MIN)/2; 114 tda_setspeed(sc); 115 116 callout_init(&sc->sc_timer, CALLOUT_MPSAFE); 117 callout_reset(&sc->sc_timer, hz*20, tda_timeout, sc); 118 } 119 120 static void 121 tda_timeout(void *v) 122 { 123 struct tda_softc *sc = v; 124 125 sysmon_task_queue_sched(0, tda_adjust, sc); 126 callout_reset(&sc->sc_timer, hz*60, tda_timeout, sc); 127 } 128 129 void 130 tda_setspeed(struct tda_softc *sc) 131 { 132 u_int8_t cmd[2]; 133 134 if (sc->sc_cfan_speed < TDA_FANSPEED_MIN) 135 sc->sc_cfan_speed = TDA_FANSPEED_MIN; 136 if (sc->sc_sfan_speed < TDA_FANSPEED_MIN) 137 sc->sc_sfan_speed = TDA_FANSPEED_MIN; 138 if (sc->sc_cfan_speed > TDA_FANSPEED_MAX) 139 sc->sc_cfan_speed = TDA_FANSPEED_MAX; 140 if (sc->sc_sfan_speed > TDA_FANSPEED_MAX) 141 sc->sc_sfan_speed = TDA_FANSPEED_MAX; 142 143 iic_acquire_bus(sc->sc_tag, 0); 144 145 cmd[0] = TDA_CPUFAN_REG; 146 cmd[1] = sc->sc_cfan_speed; 147 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 148 sc->sc_addr, &cmd, sizeof(cmd), NULL, 0, 0)) { 149 aprint_error_dev(sc->sc_dev, "cannot write cpu-fan register\n"); 150 iic_release_bus(sc->sc_tag, 0); 151 return; 152 } 153 154 cmd[0] = TDA_SYSFAN_REG; 155 cmd[1] = sc->sc_sfan_speed; 156 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 157 sc->sc_addr, &cmd, sizeof(cmd), NULL, 0, 0)) { 158 aprint_error_dev(sc->sc_dev, "cannot write system-fan register\n"); 159 iic_release_bus(sc->sc_tag, 0); 160 return; 161 } 162 163 iic_release_bus(sc->sc_tag, 0); 164 165 aprint_debug_dev(sc->sc_dev, "changed fan speed to cpu=%d system=%d\n", 166 sc->sc_cfan_speed, sc->sc_sfan_speed); 167 } 168 169 static bool 170 is_cpu_sensor(const envsys_data_t *edata) 171 { 172 if (edata->units != ENVSYS_STEMP) 173 return false; 174 return strcmp(edata->desc, "external") == 0; 175 } 176 177 static bool 178 is_system_sensor(const envsys_data_t *edata) 179 { 180 if (edata->units != ENVSYS_STEMP) 181 return false; 182 return strcmp(edata->desc, "internal") == 0; 183 } 184 185 static void 186 tda_adjust(void *v) 187 { 188 struct tda_softc *sc = v; 189 u_int64_t ctemp, stemp; 190 u_int16_t cspeed, sspeed; 191 192 /* Default to running the fans at maximum speed. */ 193 sspeed = cspeed = TDA_FANSPEED_MAX; 194 195 /* fetch maximum current temperature */ 196 ctemp = sysmon_envsys_get_max_value(is_cpu_sensor, true); 197 stemp = sysmon_envsys_get_max_value(is_system_sensor, true); 198 199 /* the predicates for selecting sensors must have gone wrong */ 200 if (ctemp == 0 || stemp == 0) { 201 aprint_error_dev(sc->sc_dev, "skipping temp adjustment" 202 " - no sensor values\n"); 203 return; 204 } 205 206 aprint_debug_dev(sc->sc_dev, "current temperature: cpu %" PRIu64 207 " system %" PRIu64 "\n", 208 ctemp, stemp); 209 210 if (ctemp < CPU_TEMP_MIN) 211 cspeed = TDA_FANSPEED_MIN; 212 else if (ctemp < CPU_TEMP_MAX) 213 cspeed = TDA_FANSPEED_MIN + 214 (ctemp - CPU_TEMP_MIN) * 215 (TDA_FANSPEED_MAX - TDA_FANSPEED_MIN) / 216 (CPU_TEMP_MAX - CPU_TEMP_MIN); 217 218 if (stemp < SYS_TEMP_MIN) 219 sspeed = TDA_FANSPEED_MIN; 220 else if (stemp < SYS_TEMP_MAX) 221 sc->sc_sfan_speed = TDA_FANSPEED_MIN + 222 (stemp - SYS_TEMP_MIN) * 223 (TDA_FANSPEED_MAX - TDA_FANSPEED_MIN) / 224 (SYS_TEMP_MAX - SYS_TEMP_MIN); 225 226 if (sspeed == sc->sc_sfan_speed && cspeed == sc->sc_cfan_speed) 227 return; 228 229 sc->sc_sfan_speed = sspeed; 230 sc->sc_cfan_speed = cspeed; 231 tda_setspeed(sc); 232 } 233