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 *therm = fan->parent; 35 struct nvkm_subdev *subdev = &therm->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); 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, 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 (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 nvkm_timer_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 *therm) 113 { 114 return therm->fan->get(therm); 115 } 116 117 int 118 nvkm_therm_fan_set(struct nvkm_therm *therm, bool immediate, int percent) 119 { 120 return nvkm_fan_update(therm->fan, immediate, percent); 121 } 122 123 int 124 nvkm_therm_fan_sense(struct nvkm_therm *therm) 125 { 126 struct nvkm_device *device = therm->subdev.device; 127 struct nvkm_timer *tmr = device->timer; 128 struct nvkm_gpio *gpio = device->gpio; 129 u32 cycles, cur, prev; 130 u64 start, end, tach; 131 132 if (therm->func->fan_sense) 133 return therm->func->fan_sense(therm); 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 = nvkm_timer_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 = nvkm_timer_read(tmr); 154 cycles++; 155 prev = cur; 156 } 157 } while (cycles < 5 && nvkm_timer_read(tmr) - start < 250000000); 158 end = nvkm_timer_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 *therm) 170 { 171 return nvkm_therm_fan_get(therm); 172 } 173 174 int 175 nvkm_therm_fan_user_set(struct nvkm_therm *therm, int percent) 176 { 177 if (therm->mode != NVKM_THERM_CTRL_MANUAL) 178 return -EINVAL; 179 180 return nvkm_therm_fan_set(therm, true, percent); 181 } 182 183 static void 184 nvkm_therm_fan_set_defaults(struct nvkm_therm *therm) 185 { 186 therm->fan->bios.pwm_freq = 0; 187 therm->fan->bios.min_duty = 0; 188 therm->fan->bios.max_duty = 100; 189 therm->fan->bios.bump_period = 500; 190 therm->fan->bios.slow_down_period = 2000; 191 therm->fan->bios.linear_min_temp = 40; 192 therm->fan->bios.linear_max_temp = 85; 193 } 194 195 static void 196 nvkm_therm_fan_safety_checks(struct nvkm_therm *therm) 197 { 198 if (therm->fan->bios.min_duty > 100) 199 therm->fan->bios.min_duty = 100; 200 if (therm->fan->bios.max_duty > 100) 201 therm->fan->bios.max_duty = 100; 202 203 if (therm->fan->bios.min_duty > therm->fan->bios.max_duty) 204 therm->fan->bios.min_duty = therm->fan->bios.max_duty; 205 } 206 207 int 208 nvkm_therm_fan_init(struct nvkm_therm *therm) 209 { 210 return 0; 211 } 212 213 int 214 nvkm_therm_fan_fini(struct nvkm_therm *therm, bool suspend) 215 { 216 struct nvkm_timer *tmr = therm->subdev.device->timer; 217 if (suspend) 218 nvkm_timer_alarm(tmr, 0, &therm->fan->alarm); 219 return 0; 220 } 221 222 int 223 nvkm_therm_fan_ctor(struct nvkm_therm *therm) 224 { 225 struct nvkm_subdev *subdev = &therm->subdev; 226 struct nvkm_device *device = subdev->device; 227 struct nvkm_gpio *gpio = device->gpio; 228 struct nvkm_bios *bios = device->bios; 229 struct dcb_gpio_func func; 230 int ret; 231 232 /* attempt to locate a drivable fan, and determine control method */ 233 ret = nvkm_gpio_find(gpio, 0, DCB_GPIO_FAN, 0xff, &func); 234 if (ret == 0) { 235 /* FIXME: is this really the place to perform such checks ? */ 236 if (func.line != 16 && func.log[0] & DCB_GPIO_LOG_DIR_IN) { 237 nvkm_debug(subdev, "GPIO_FAN is in input mode\n"); 238 ret = -EINVAL; 239 } else { 240 ret = nvkm_fanpwm_create(therm, &func); 241 if (ret != 0) 242 ret = nvkm_fantog_create(therm, &func); 243 } 244 } 245 246 /* no controllable fan found, create a dummy fan module */ 247 if (ret != 0) { 248 ret = nvkm_fannil_create(therm); 249 if (ret) 250 return ret; 251 } 252 253 nvkm_debug(subdev, "FAN control: %s\n", therm->fan->type); 254 255 /* read the current speed, it is useful when resuming */ 256 therm->fan->percent = nvkm_therm_fan_get(therm); 257 258 /* attempt to detect a tachometer connection */ 259 ret = nvkm_gpio_find(gpio, 0, DCB_GPIO_FAN_SENSE, 0xff, 260 &therm->fan->tach); 261 if (ret) 262 therm->fan->tach.func = DCB_GPIO_UNUSED; 263 264 /* initialise fan bump/slow update handling */ 265 therm->fan->parent = therm; 266 nvkm_alarm_init(&therm->fan->alarm, nvkm_fan_alarm); 267 spin_lock_init(&therm->fan->lock); 268 269 /* other random init... */ 270 nvkm_therm_fan_set_defaults(therm); 271 nvbios_perf_fan_parse(bios, &therm->fan->perf); 272 if (!nvbios_fan_parse(bios, &therm->fan->bios)) { 273 nvkm_debug(subdev, "parsing the fan table failed\n"); 274 if (nvbios_therm_fan_parse(bios, &therm->fan->bios)) 275 nvkm_error(subdev, "parsing both fan tables failed\n"); 276 } 277 nvkm_therm_fan_safety_checks(therm); 278 return 0; 279 } 280