2 * Copyright 2012 Red Hat Inc.
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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.
27 #include <subdev/bios/fan.h>
28 #include <subdev/gpio.h>
29 #include <subdev/timer.h>
32 nvkm_fan_update(struct nvkm_fan *fan, bool immediate, int target)
34 struct nvkm_therm_priv *therm = (void *)fan->parent;
35 struct nvkm_timer *tmr = nvkm_timer(therm);
40 /* update target fan speed, restricting to allowed range */
41 spin_lock_irqsave(&fan->lock, flags);
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;
51 /* check that we're not already at the target duty cycle */
52 duty = fan->get(&therm->base);
54 spin_unlock_irqrestore(&fan->lock, flags);
58 /* smooth out the fanspeed increase/decrease */
59 if (!immediate && duty >= 0) {
60 /* the constant "3" is a rough approximation taken from
62 * it is meant to bump the fan speed more incrementally
65 duty = min(duty + 3, target);
66 else if (duty > target)
67 duty = max(duty - 3, target);
72 nv_debug(therm, "FAN update: %d\n", duty);
73 ret = fan->set(&therm->base, duty);
75 spin_unlock_irqrestore(&fan->lock, flags);
79 /* fan speed updated, drop the fan lock before grabbing the
80 * alarm-scheduling lock and risking a deadlock
82 spin_unlock_irqrestore(&fan->lock, flags);
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;
91 delay = slow_down_period;
92 else if (duty == target)
93 delay = min(bump_period, slow_down_period) ;
97 tmr->alarm(tmr, delay * 1000 * 1000, &fan->alarm);
104 nvkm_fan_alarm(struct nvkm_alarm *alarm)
106 struct nvkm_fan *fan = container_of(alarm, struct nvkm_fan, alarm);
107 nvkm_fan_update(fan, false, -1);
111 nvkm_therm_fan_get(struct nvkm_therm *obj)
113 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base);
114 return therm->fan->get(&therm->base);
118 nvkm_therm_fan_set(struct nvkm_therm *obj, bool immediate, int percent)
120 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base);
121 return nvkm_fan_update(therm->fan, immediate, percent);
125 nvkm_therm_fan_sense(struct nvkm_therm *obj)
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;
133 if (therm->fan->tach.func == DCB_GPIO_UNUSED)
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.
140 start = tmr->read(tmr);
141 prev = gpio->get(gpio, 0, therm->fan->tach.func, therm->fan->tach.line);
144 usleep_range(500, 1000); /* supports 0 < rpm < 7500 */
146 cur = gpio->get(gpio, 0, therm->fan->tach.func, therm->fan->tach.line);
149 start = tmr->read(tmr);
153 } while (cycles < 5 && tmr->read(tmr) - start < 250000000);
154 end = tmr->read(tmr);
157 tach = (u64)60000000000ULL;
158 do_div(tach, (end - start));
165 nvkm_therm_fan_user_get(struct nvkm_therm *obj)
167 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base);
168 return nvkm_therm_fan_get(&therm->base);
172 nvkm_therm_fan_user_set(struct nvkm_therm *obj, int percent)
174 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base);
176 if (therm->mode != NVKM_THERM_CTRL_MANUAL)
179 return nvkm_therm_fan_set(&therm->base, true, percent);
183 nvkm_therm_fan_set_defaults(struct nvkm_therm *obj)
185 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base);
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;
197 nvkm_therm_fan_safety_checks(struct nvkm_therm *obj)
199 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base);
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;
206 if (therm->fan->bios.min_duty > therm->fan->bios.max_duty)
207 therm->fan->bios.min_duty = therm->fan->bios.max_duty;
211 nvkm_therm_fan_init(struct nvkm_therm *obj)
217 nvkm_therm_fan_fini(struct nvkm_therm *obj, bool suspend)
219 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base);
220 struct nvkm_timer *tmr = nvkm_timer(therm);
223 tmr->alarm_cancel(tmr, &therm->fan->alarm);
228 nvkm_therm_fan_ctor(struct nvkm_therm *obj)
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;
236 /* attempt to locate a drivable fan, and determine control method */
237 ret = gpio->find(gpio, 0, DCB_GPIO_FAN, 0xff, &func);
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");
244 ret = nvkm_fanpwm_create(&therm->base, &func);
246 ret = nvkm_fantog_create(&therm->base, &func);
250 /* no controllable fan found, create a dummy fan module */
252 ret = nvkm_fannil_create(&therm->base);
257 nv_info(therm, "FAN control: %s\n", therm->fan->type);
259 /* read the current speed, it is useful when resuming */
260 therm->fan->percent = nvkm_therm_fan_get(&therm->base);
262 /* attempt to detect a tachometer connection */
263 ret = gpio->find(gpio, 0, DCB_GPIO_FAN_SENSE, 0xff, &therm->fan->tach);
265 therm->fan->tach.func = DCB_GPIO_UNUSED;
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);
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");
280 nvkm_therm_fan_safety_checks(&therm->base);