1 /* 2 * Copyright 2012 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Ben Skeggs 23 * Martin Peres 24 */ 25 #include "priv.h" 26 27 #include <subdev/bios/fan.h> 28 #include <subdev/gpio.h> 29 #include <subdev/timer.h> 30 31 static int 32 nvkm_fan_update(struct nvkm_fan *fan, bool immediate, int target) 33 { 34 struct nvkm_therm_priv *therm = (void *)fan->parent; 35 struct nvkm_timer *tmr = nvkm_timer(therm); 36 unsigned long flags; 37 int ret = 0; 38 int duty; 39 40 /* update target fan speed, restricting to allowed range */ 41 spin_lock_irqsave(&fan->lock, flags); 42 if (target < 0) 43 target = fan->percent; 44 target = max_t(u8, target, fan->bios.min_duty); 45 target = min_t(u8, target, fan->bios.max_duty); 46 if (fan->percent != target) { 47 nv_debug(therm, "FAN target: %d\n", target); 48 fan->percent = target; 49 } 50 51 /* check that we're not already at the target duty cycle */ 52 duty = fan->get(&therm->base); 53 if (duty == target) { 54 spin_unlock_irqrestore(&fan->lock, flags); 55 return 0; 56 } 57 58 /* smooth out the fanspeed increase/decrease */ 59 if (!immediate && duty >= 0) { 60 /* the constant "3" is a rough approximation taken from 61 * nvidia's behaviour. 62 * it is meant to bump the fan speed more incrementally 63 */ 64 if (duty < target) 65 duty = min(duty + 3, target); 66 else if (duty > target) 67 duty = max(duty - 3, target); 68 } else { 69 duty = target; 70 } 71 72 nv_debug(therm, "FAN update: %d\n", duty); 73 ret = fan->set(&therm->base, duty); 74 if (ret) { 75 spin_unlock_irqrestore(&fan->lock, flags); 76 return ret; 77 } 78 79 /* fan speed updated, drop the fan lock before grabbing the 80 * alarm-scheduling lock and risking a deadlock 81 */ 82 spin_unlock_irqrestore(&fan->lock, flags); 83 84 /* schedule next fan update, if not at target speed already */ 85 if (list_empty(&fan->alarm.head) && target != duty) { 86 u16 bump_period = fan->bios.bump_period; 87 u16 slow_down_period = fan->bios.slow_down_period; 88 u64 delay; 89 90 if (duty > target) 91 delay = slow_down_period; 92 else if (duty == target) 93 delay = min(bump_period, slow_down_period) ; 94 else 95 delay = bump_period; 96 97 tmr->alarm(tmr, delay * 1000 * 1000, &fan->alarm); 98 } 99 100 return ret; 101 } 102 103 static void 104 nvkm_fan_alarm(struct nvkm_alarm *alarm) 105 { 106 struct nvkm_fan *fan = container_of(alarm, struct nvkm_fan, alarm); 107 nvkm_fan_update(fan, false, -1); 108 } 109 110 int 111 nvkm_therm_fan_get(struct nvkm_therm *obj) 112 { 113 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 114 return therm->fan->get(&therm->base); 115 } 116 117 int 118 nvkm_therm_fan_set(struct nvkm_therm *obj, bool immediate, int percent) 119 { 120 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 121 return nvkm_fan_update(therm->fan, immediate, percent); 122 } 123 124 int 125 nvkm_therm_fan_sense(struct nvkm_therm *obj) 126 { 127 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 128 struct nvkm_timer *tmr = nvkm_timer(therm); 129 struct nvkm_gpio *gpio = nvkm_gpio(therm); 130 u32 cycles, cur, prev; 131 u64 start, end, tach; 132 133 if (therm->fan->tach.func == DCB_GPIO_UNUSED) 134 return -ENODEV; 135 136 /* Time a complete rotation and extrapolate to RPM: 137 * When the fan spins, it changes the value of GPIO FAN_SENSE. 138 * We get 4 changes (0 -> 1 -> 0 -> 1) per complete rotation. 139 */ 140 start = tmr->read(tmr); 141 prev = gpio->get(gpio, 0, therm->fan->tach.func, therm->fan->tach.line); 142 cycles = 0; 143 do { 144 usleep_range(500, 1000); /* supports 0 < rpm < 7500 */ 145 146 cur = gpio->get(gpio, 0, therm->fan->tach.func, therm->fan->tach.line); 147 if (prev != cur) { 148 if (!start) 149 start = tmr->read(tmr); 150 cycles++; 151 prev = cur; 152 } 153 } while (cycles < 5 && tmr->read(tmr) - start < 250000000); 154 end = tmr->read(tmr); 155 156 if (cycles == 5) { 157 tach = (u64)60000000000ULL; 158 do_div(tach, (end - start)); 159 return tach; 160 } else 161 return 0; 162 } 163 164 int 165 nvkm_therm_fan_user_get(struct nvkm_therm *obj) 166 { 167 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 168 return nvkm_therm_fan_get(&therm->base); 169 } 170 171 int 172 nvkm_therm_fan_user_set(struct nvkm_therm *obj, int percent) 173 { 174 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 175 176 if (therm->mode != NVKM_THERM_CTRL_MANUAL) 177 return -EINVAL; 178 179 return nvkm_therm_fan_set(&therm->base, true, percent); 180 } 181 182 static void 183 nvkm_therm_fan_set_defaults(struct nvkm_therm *obj) 184 { 185 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 186 187 therm->fan->bios.pwm_freq = 0; 188 therm->fan->bios.min_duty = 0; 189 therm->fan->bios.max_duty = 100; 190 therm->fan->bios.bump_period = 500; 191 therm->fan->bios.slow_down_period = 2000; 192 therm->fan->bios.linear_min_temp = 40; 193 therm->fan->bios.linear_max_temp = 85; 194 } 195 196 static void 197 nvkm_therm_fan_safety_checks(struct nvkm_therm *obj) 198 { 199 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 200 201 if (therm->fan->bios.min_duty > 100) 202 therm->fan->bios.min_duty = 100; 203 if (therm->fan->bios.max_duty > 100) 204 therm->fan->bios.max_duty = 100; 205 206 if (therm->fan->bios.min_duty > therm->fan->bios.max_duty) 207 therm->fan->bios.min_duty = therm->fan->bios.max_duty; 208 } 209 210 int 211 nvkm_therm_fan_init(struct nvkm_therm *obj) 212 { 213 return 0; 214 } 215 216 int 217 nvkm_therm_fan_fini(struct nvkm_therm *obj, bool suspend) 218 { 219 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 220 struct nvkm_timer *tmr = nvkm_timer(therm); 221 222 if (suspend) 223 tmr->alarm_cancel(tmr, &therm->fan->alarm); 224 return 0; 225 } 226 227 int 228 nvkm_therm_fan_ctor(struct nvkm_therm *obj) 229 { 230 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 231 struct nvkm_gpio *gpio = nvkm_gpio(therm); 232 struct nvkm_bios *bios = nvkm_bios(therm); 233 struct dcb_gpio_func func; 234 int ret; 235 236 /* attempt to locate a drivable fan, and determine control method */ 237 ret = gpio->find(gpio, 0, DCB_GPIO_FAN, 0xff, &func); 238 if (ret == 0) { 239 /* FIXME: is this really the place to perform such checks ? */ 240 if (func.line != 16 && func.log[0] & DCB_GPIO_LOG_DIR_IN) { 241 nv_debug(therm, "GPIO_FAN is in input mode\n"); 242 ret = -EINVAL; 243 } else { 244 ret = nvkm_fanpwm_create(&therm->base, &func); 245 if (ret != 0) 246 ret = nvkm_fantog_create(&therm->base, &func); 247 } 248 } 249 250 /* no controllable fan found, create a dummy fan module */ 251 if (ret != 0) { 252 ret = nvkm_fannil_create(&therm->base); 253 if (ret) 254 return ret; 255 } 256 257 nv_info(therm, "FAN control: %s\n", therm->fan->type); 258 259 /* read the current speed, it is useful when resuming */ 260 therm->fan->percent = nvkm_therm_fan_get(&therm->base); 261 262 /* attempt to detect a tachometer connection */ 263 ret = gpio->find(gpio, 0, DCB_GPIO_FAN_SENSE, 0xff, &therm->fan->tach); 264 if (ret) 265 therm->fan->tach.func = DCB_GPIO_UNUSED; 266 267 /* initialise fan bump/slow update handling */ 268 therm->fan->parent = &therm->base; 269 nvkm_alarm_init(&therm->fan->alarm, nvkm_fan_alarm); 270 spin_lock_init(&therm->fan->lock); 271 272 /* other random init... */ 273 nvkm_therm_fan_set_defaults(&therm->base); 274 nvbios_perf_fan_parse(bios, &therm->fan->perf); 275 if (!nvbios_fan_parse(bios, &therm->fan->bios)) { 276 nv_debug(therm, "parsing the fan table failed\n"); 277 if (nvbios_therm_fan_parse(bios, &therm->fan->bios)) 278 nv_error(therm, "parsing both fan tables failed\n"); 279 } 280 nvkm_therm_fan_safety_checks(&therm->base); 281 return 0; 282 } 283