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 31static int 32nvkm_fan_update(struct nvkm_fan *fan, bool immediate, int target) 33{ 34 struct nvkm_therm *therm = fan->parent; 35 struct nvkm_therm_priv *priv = (void *)therm; 36 struct nvkm_timer *ptimer = nvkm_timer(priv); 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 nv_debug(therm, "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 nv_debug(therm, "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 (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 ptimer->alarm(ptimer, delay * 1000 * 1000, &fan->alarm); 99 } 100 101 return ret; 102} 103 104static void 105nvkm_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 111int 112nvkm_therm_fan_get(struct nvkm_therm *therm) 113{ 114 struct nvkm_therm_priv *priv = (void *)therm; 115 return priv->fan->get(therm); 116} 117 118int 119nvkm_therm_fan_set(struct nvkm_therm *therm, bool immediate, int percent) 120{ 121 struct nvkm_therm_priv *priv = (void *)therm; 122 return nvkm_fan_update(priv->fan, immediate, percent); 123} 124 125int 126nvkm_therm_fan_sense(struct nvkm_therm *therm) 127{ 128 struct nvkm_therm_priv *priv = (void *)therm; 129 struct nvkm_timer *ptimer = nvkm_timer(therm); 130 struct nvkm_gpio *gpio = nvkm_gpio(therm); 131 u32 cycles, cur, prev; 132 u64 start, end, tach; 133 134 if (priv->fan->tach.func == DCB_GPIO_UNUSED) 135 return -ENODEV; 136 137 /* Time a complete rotation and extrapolate to RPM: 138 * When the fan spins, it changes the value of GPIO FAN_SENSE. 139 * We get 4 changes (0 -> 1 -> 0 -> 1) per complete rotation. 140 */ 141 start = ptimer->read(ptimer); 142 prev = gpio->get(gpio, 0, priv->fan->tach.func, priv->fan->tach.line); 143 cycles = 0; 144 do { 145 usleep_range(500, 1000); /* supports 0 < rpm < 7500 */ 146 147 cur = gpio->get(gpio, 0, priv->fan->tach.func, priv->fan->tach.line); 148 if (prev != cur) { 149 if (!start) 150 start = ptimer->read(ptimer); 151 cycles++; 152 prev = cur; 153 } 154 } while (cycles < 5 && ptimer->read(ptimer) - start < 250000000); 155 end = ptimer->read(ptimer); 156 157 if (cycles == 5) { 158 tach = (u64)60000000000ULL; 159 do_div(tach, (end - start)); 160 return tach; 161 } else 162 return 0; 163} 164 165int 166nvkm_therm_fan_user_get(struct nvkm_therm *therm) 167{ 168 return nvkm_therm_fan_get(therm); 169} 170 171int 172nvkm_therm_fan_user_set(struct nvkm_therm *therm, int percent) 173{ 174 struct nvkm_therm_priv *priv = (void *)therm; 175 176 if (priv->mode != NVKM_THERM_CTRL_MANUAL) 177 return -EINVAL; 178 179 return nvkm_therm_fan_set(therm, true, percent); 180} 181 182static void 183nvkm_therm_fan_set_defaults(struct nvkm_therm *therm) 184{ 185 struct nvkm_therm_priv *priv = (void *)therm; 186 187 priv->fan->bios.pwm_freq = 0; 188 priv->fan->bios.min_duty = 0; 189 priv->fan->bios.max_duty = 100; 190 priv->fan->bios.bump_period = 500; 191 priv->fan->bios.slow_down_period = 2000; 192 priv->fan->bios.linear_min_temp = 40; 193 priv->fan->bios.linear_max_temp = 85; 194} 195 196static void 197nvkm_therm_fan_safety_checks(struct nvkm_therm *therm) 198{ 199 struct nvkm_therm_priv *priv = (void *)therm; 200 201 if (priv->fan->bios.min_duty > 100) 202 priv->fan->bios.min_duty = 100; 203 if (priv->fan->bios.max_duty > 100) 204 priv->fan->bios.max_duty = 100; 205 206 if (priv->fan->bios.min_duty > priv->fan->bios.max_duty) 207 priv->fan->bios.min_duty = priv->fan->bios.max_duty; 208} 209 210int 211nvkm_therm_fan_init(struct nvkm_therm *therm) 212{ 213 return 0; 214} 215 216int 217nvkm_therm_fan_fini(struct nvkm_therm *therm, bool suspend) 218{ 219 struct nvkm_therm_priv *priv = (void *)therm; 220 struct nvkm_timer *ptimer = nvkm_timer(therm); 221 222 if (suspend) 223 ptimer->alarm_cancel(ptimer, &priv->fan->alarm); 224 return 0; 225} 226 227int 228nvkm_therm_fan_ctor(struct nvkm_therm *therm) 229{ 230 struct nvkm_therm_priv *priv = (void *)therm; 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, &func); 245 if (ret != 0) 246 ret = nvkm_fantog_create(therm, &func); 247 } 248 } 249 250 /* no controllable fan found, create a dummy fan module */ 251 if (ret != 0) { 252 ret = nvkm_fannil_create(therm); 253 if (ret) 254 return ret; 255 } 256 257 nv_info(therm, "FAN control: %s\n", priv->fan->type); 258 259 /* read the current speed, it is useful when resuming */ 260 priv->fan->percent = nvkm_therm_fan_get(therm); 261 262 /* attempt to detect a tachometer connection */ 263 ret = gpio->find(gpio, 0, DCB_GPIO_FAN_SENSE, 0xff, &priv->fan->tach); 264 if (ret) 265 priv->fan->tach.func = DCB_GPIO_UNUSED; 266 267 /* initialise fan bump/slow update handling */ 268 priv->fan->parent = therm; 269 nvkm_alarm_init(&priv->fan->alarm, nvkm_fan_alarm); 270 spin_lock_init(&priv->fan->lock); 271 272 /* other random init... */ 273 nvkm_therm_fan_set_defaults(therm); 274 nvbios_perf_fan_parse(bios, &priv->fan->perf); 275 if (!nvbios_fan_parse(bios, &priv->fan->bios)) { 276 nv_debug(therm, "parsing the fan table failed\n"); 277 if (nvbios_therm_fan_parse(bios, &priv->fan->bios)) 278 nv_error(therm, "parsing both fan tables failed\n"); 279 } 280 nvkm_therm_fan_safety_checks(therm); 281 return 0; 282} 283