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_subdev *subdev = &therm->base.subdev; 36 struct nvkm_timer *tmr = subdev->device->timer; 37 unsigned long flags; 38 int ret = 0; 39 int duty; 40 41 /* update target fan speed, restricting to allowed range */ 42 spin_lock_irqsave(&fan->lock, flags); 43 if (target < 0) 44 target = fan->percent; 45 target = max_t(u8, target, fan->bios.min_duty); 46 target = min_t(u8, target, fan->bios.max_duty); 47 if (fan->percent != target) { 48 nvkm_debug(subdev, "FAN target: %d\n", target); 49 fan->percent = target; 50 } 51 52 /* check that we're not already at the target duty cycle */ 53 duty = fan->get(&therm->base); 54 if (duty == target) { 55 spin_unlock_irqrestore(&fan->lock, flags); 56 return 0; 57 } 58 59 /* smooth out the fanspeed increase/decrease */ 60 if (!immediate && duty >= 0) { 61 /* the constant "3" is a rough approximation taken from 62 * nvidia's behaviour. 63 * it is meant to bump the fan speed more incrementally 64 */ 65 if (duty < target) 66 duty = min(duty + 3, target); 67 else if (duty > target) 68 duty = max(duty - 3, target); 69 } else { 70 duty = target; 71 } 72 73 nvkm_debug(subdev, "FAN update: %d\n", duty); 74 ret = fan->set(&therm->base, duty); 75 if (ret) { 76 spin_unlock_irqrestore(&fan->lock, flags); 77 return ret; 78 } 79 80 /* fan speed updated, drop the fan lock before grabbing the 81 * alarm-scheduling lock and risking a deadlock 82 */ 83 spin_unlock_irqrestore(&fan->lock, flags); 84 85 /* schedule next fan update, if not at target speed already */ 86 if (list_empty(&fan->alarm.head) && target != duty) { 87 u16 bump_period = fan->bios.bump_period; 88 u16 slow_down_period = fan->bios.slow_down_period; 89 u64 delay; 90 91 if (duty > target) 92 delay = slow_down_period; 93 else if (duty == target) 94 delay = min(bump_period, slow_down_period) ; 95 else 96 delay = bump_period; 97 98 tmr->alarm(tmr, delay * 1000 * 1000, &fan->alarm); 99 } 100 101 return ret; 102 } 103 104 static void 105 nvkm_fan_alarm(struct nvkm_alarm *alarm) 106 { 107 struct nvkm_fan *fan = container_of(alarm, struct nvkm_fan, alarm); 108 nvkm_fan_update(fan, false, -1); 109 } 110 111 int 112 nvkm_therm_fan_get(struct nvkm_therm *obj) 113 { 114 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 115 return therm->fan->get(&therm->base); 116 } 117 118 int 119 nvkm_therm_fan_set(struct nvkm_therm *obj, bool immediate, int percent) 120 { 121 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 122 return nvkm_fan_update(therm->fan, immediate, percent); 123 } 124 125 int 126 nvkm_therm_fan_sense(struct nvkm_therm *obj) 127 { 128 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 129 struct nvkm_device *device = therm->base.subdev.device; 130 struct nvkm_timer *tmr = device->timer; 131 struct nvkm_gpio *gpio = device->gpio; 132 u32 cycles, cur, prev; 133 u64 start, end, tach; 134 135 if (therm->fan->tach.func == DCB_GPIO_UNUSED) 136 return -ENODEV; 137 138 /* Time a complete rotation and extrapolate to RPM: 139 * When the fan spins, it changes the value of GPIO FAN_SENSE. 140 * We get 4 changes (0 -> 1 -> 0 -> 1) per complete rotation. 141 */ 142 start = tmr->read(tmr); 143 prev = nvkm_gpio_get(gpio, 0, therm->fan->tach.func, 144 therm->fan->tach.line); 145 cycles = 0; 146 do { 147 usleep_range(500, 1000); /* supports 0 < rpm < 7500 */ 148 149 cur = nvkm_gpio_get(gpio, 0, therm->fan->tach.func, 150 therm->fan->tach.line); 151 if (prev != cur) { 152 if (!start) 153 start = tmr->read(tmr); 154 cycles++; 155 prev = cur; 156 } 157 } while (cycles < 5 && tmr->read(tmr) - start < 250000000); 158 end = tmr->read(tmr); 159 160 if (cycles == 5) { 161 tach = (u64)60000000000ULL; 162 do_div(tach, (end - start)); 163 return tach; 164 } else 165 return 0; 166 } 167 168 int 169 nvkm_therm_fan_user_get(struct nvkm_therm *obj) 170 { 171 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 172 return nvkm_therm_fan_get(&therm->base); 173 } 174 175 int 176 nvkm_therm_fan_user_set(struct nvkm_therm *obj, int percent) 177 { 178 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 179 180 if (therm->mode != NVKM_THERM_CTRL_MANUAL) 181 return -EINVAL; 182 183 return nvkm_therm_fan_set(&therm->base, true, percent); 184 } 185 186 static void 187 nvkm_therm_fan_set_defaults(struct nvkm_therm *obj) 188 { 189 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 190 191 therm->fan->bios.pwm_freq = 0; 192 therm->fan->bios.min_duty = 0; 193 therm->fan->bios.max_duty = 100; 194 therm->fan->bios.bump_period = 500; 195 therm->fan->bios.slow_down_period = 2000; 196 therm->fan->bios.linear_min_temp = 40; 197 therm->fan->bios.linear_max_temp = 85; 198 } 199 200 static void 201 nvkm_therm_fan_safety_checks(struct nvkm_therm *obj) 202 { 203 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 204 205 if (therm->fan->bios.min_duty > 100) 206 therm->fan->bios.min_duty = 100; 207 if (therm->fan->bios.max_duty > 100) 208 therm->fan->bios.max_duty = 100; 209 210 if (therm->fan->bios.min_duty > therm->fan->bios.max_duty) 211 therm->fan->bios.min_duty = therm->fan->bios.max_duty; 212 } 213 214 int 215 nvkm_therm_fan_init(struct nvkm_therm *obj) 216 { 217 return 0; 218 } 219 220 int 221 nvkm_therm_fan_fini(struct nvkm_therm *obj, bool suspend) 222 { 223 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 224 struct nvkm_timer *tmr = nvkm_timer(therm); 225 226 if (suspend) 227 tmr->alarm_cancel(tmr, &therm->fan->alarm); 228 return 0; 229 } 230 231 int 232 nvkm_therm_fan_ctor(struct nvkm_therm *obj) 233 { 234 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 235 struct nvkm_subdev *subdev = &therm->base.subdev; 236 struct nvkm_device *device = subdev->device; 237 struct nvkm_gpio *gpio = device->gpio; 238 struct nvkm_bios *bios = device->bios; 239 struct dcb_gpio_func func; 240 int ret; 241 242 /* attempt to locate a drivable fan, and determine control method */ 243 ret = nvkm_gpio_find(gpio, 0, DCB_GPIO_FAN, 0xff, &func); 244 if (ret == 0) { 245 /* FIXME: is this really the place to perform such checks ? */ 246 if (func.line != 16 && func.log[0] & DCB_GPIO_LOG_DIR_IN) { 247 nvkm_debug(subdev, "GPIO_FAN is in input mode\n"); 248 ret = -EINVAL; 249 } else { 250 ret = nvkm_fanpwm_create(&therm->base, &func); 251 if (ret != 0) 252 ret = nvkm_fantog_create(&therm->base, &func); 253 } 254 } 255 256 /* no controllable fan found, create a dummy fan module */ 257 if (ret != 0) { 258 ret = nvkm_fannil_create(&therm->base); 259 if (ret) 260 return ret; 261 } 262 263 nvkm_debug(subdev, "FAN control: %s\n", therm->fan->type); 264 265 /* read the current speed, it is useful when resuming */ 266 therm->fan->percent = nvkm_therm_fan_get(&therm->base); 267 268 /* attempt to detect a tachometer connection */ 269 ret = nvkm_gpio_find(gpio, 0, DCB_GPIO_FAN_SENSE, 0xff, 270 &therm->fan->tach); 271 if (ret) 272 therm->fan->tach.func = DCB_GPIO_UNUSED; 273 274 /* initialise fan bump/slow update handling */ 275 therm->fan->parent = &therm->base; 276 nvkm_alarm_init(&therm->fan->alarm, nvkm_fan_alarm); 277 spin_lock_init(&therm->fan->lock); 278 279 /* other random init... */ 280 nvkm_therm_fan_set_defaults(&therm->base); 281 nvbios_perf_fan_parse(bios, &therm->fan->perf); 282 if (!nvbios_fan_parse(bios, &therm->fan->bios)) { 283 nvkm_debug(subdev, "parsing the fan table failed\n"); 284 if (nvbios_therm_fan_parse(bios, &therm->fan->bios)) 285 nvkm_error(subdev, "parsing both fan tables failed\n"); 286 } 287 nvkm_therm_fan_safety_checks(&therm->base); 288 return 0; 289 } 290