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path: root/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c')
-rw-r--r--drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c
new file mode 100644
index 000000000000..3656d605168f
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c
@@ -0,0 +1,287 @@
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
26#include "priv.h"
27
28#include <core/object.h>
29#include <core/device.h>
30
31#include <subdev/gpio.h>
32#include <subdev/timer.h>
33
34#include <subdev/bios/fan.h>
35
36static int
37nouveau_fan_update(struct nouveau_fan *fan, bool immediate, int target)
38{
39 struct nouveau_therm *therm = fan->parent;
40 struct nouveau_therm_priv *priv = (void *)therm;
41 struct nouveau_timer *ptimer = nouveau_timer(priv);
42 unsigned long flags;
43 int ret = 0;
44 int duty;
45
46 /* update target fan speed, restricting to allowed range */
47 spin_lock_irqsave(&fan->lock, flags);
48 if (target < 0)
49 target = fan->percent;
50 target = max_t(u8, target, fan->bios.min_duty);
51 target = min_t(u8, target, fan->bios.max_duty);
52 if (fan->percent != target) {
53 nv_debug(therm, "FAN target: %d\n", target);
54 fan->percent = target;
55 }
56
57 /* check that we're not already at the target duty cycle */
58 duty = fan->get(therm);
59 if (duty == target) {
60 spin_unlock_irqrestore(&fan->lock, flags);
61 return 0;
62 }
63
64 /* smooth out the fanspeed increase/decrease */
65 if (!immediate && duty >= 0) {
66 /* the constant "3" is a rough approximation taken from
67 * nvidia's behaviour.
68 * it is meant to bump the fan speed more incrementally
69 */
70 if (duty < target)
71 duty = min(duty + 3, target);
72 else if (duty > target)
73 duty = max(duty - 3, target);
74 } else {
75 duty = target;
76 }
77
78 nv_debug(therm, "FAN update: %d\n", duty);
79 ret = fan->set(therm, duty);
80 if (ret) {
81 spin_unlock_irqrestore(&fan->lock, flags);
82 return ret;
83 }
84
85 /* fan speed updated, drop the fan lock before grabbing the
86 * alarm-scheduling lock and risking a deadlock
87 */
88 spin_unlock_irqrestore(&fan->lock, flags);
89
90 /* schedule next fan update, if not at target speed already */
91 if (list_empty(&fan->alarm.head) && target != duty) {
92 u16 bump_period = fan->bios.bump_period;
93 u16 slow_down_period = fan->bios.slow_down_period;
94 u64 delay;
95
96 if (duty > target)
97 delay = slow_down_period;
98 else if (duty == target)
99 delay = min(bump_period, slow_down_period) ;
100 else
101 delay = bump_period;
102
103 ptimer->alarm(ptimer, delay * 1000 * 1000, &fan->alarm);
104 }
105
106 return ret;
107}
108
109static void
110nouveau_fan_alarm(struct nouveau_alarm *alarm)
111{
112 struct nouveau_fan *fan = container_of(alarm, struct nouveau_fan, alarm);
113 nouveau_fan_update(fan, false, -1);
114}
115
116int
117nouveau_therm_fan_get(struct nouveau_therm *therm)
118{
119 struct nouveau_therm_priv *priv = (void *)therm;
120 return priv->fan->get(therm);
121}
122
123int
124nouveau_therm_fan_set(struct nouveau_therm *therm, bool immediate, int percent)
125{
126 struct nouveau_therm_priv *priv = (void *)therm;
127 return nouveau_fan_update(priv->fan, immediate, percent);
128}
129
130int
131nouveau_therm_fan_sense(struct nouveau_therm *therm)
132{
133 struct nouveau_therm_priv *priv = (void *)therm;
134 struct nouveau_timer *ptimer = nouveau_timer(therm);
135 struct nouveau_gpio *gpio = nouveau_gpio(therm);
136 u32 cycles, cur, prev;
137 u64 start, end, tach;
138
139 if (priv->fan->tach.func == DCB_GPIO_UNUSED)
140 return -ENODEV;
141
142 /* Time a complete rotation and extrapolate to RPM:
143 * When the fan spins, it changes the value of GPIO FAN_SENSE.
144 * We get 4 changes (0 -> 1 -> 0 -> 1) per complete rotation.
145 */
146 start = ptimer->read(ptimer);
147 prev = gpio->get(gpio, 0, priv->fan->tach.func, priv->fan->tach.line);
148 cycles = 0;
149 do {
150 usleep_range(500, 1000); /* supports 0 < rpm < 7500 */
151
152 cur = gpio->get(gpio, 0, priv->fan->tach.func, priv->fan->tach.line);
153 if (prev != cur) {
154 if (!start)
155 start = ptimer->read(ptimer);
156 cycles++;
157 prev = cur;
158 }
159 } while (cycles < 5 && ptimer->read(ptimer) - start < 250000000);
160 end = ptimer->read(ptimer);
161
162 if (cycles == 5) {
163 tach = (u64)60000000000ULL;
164 do_div(tach, (end - start));
165 return tach;
166 } else
167 return 0;
168}
169
170int
171nouveau_therm_fan_user_get(struct nouveau_therm *therm)
172{
173 return nouveau_therm_fan_get(therm);
174}
175
176int
177nouveau_therm_fan_user_set(struct nouveau_therm *therm, int percent)
178{
179 struct nouveau_therm_priv *priv = (void *)therm;
180
181 if (priv->mode != NOUVEAU_THERM_CTRL_MANUAL)
182 return -EINVAL;
183
184 return nouveau_therm_fan_set(therm, true, percent);
185}
186
187static void
188nouveau_therm_fan_set_defaults(struct nouveau_therm *therm)
189{
190 struct nouveau_therm_priv *priv = (void *)therm;
191
192 priv->fan->bios.pwm_freq = 0;
193 priv->fan->bios.min_duty = 0;
194 priv->fan->bios.max_duty = 100;
195 priv->fan->bios.bump_period = 500;
196 priv->fan->bios.slow_down_period = 2000;
197 priv->fan->bios.linear_min_temp = 40;
198 priv->fan->bios.linear_max_temp = 85;
199}
200
201static void
202nouveau_therm_fan_safety_checks(struct nouveau_therm *therm)
203{
204 struct nouveau_therm_priv *priv = (void *)therm;
205
206 if (priv->fan->bios.min_duty > 100)
207 priv->fan->bios.min_duty = 100;
208 if (priv->fan->bios.max_duty > 100)
209 priv->fan->bios.max_duty = 100;
210
211 if (priv->fan->bios.min_duty > priv->fan->bios.max_duty)
212 priv->fan->bios.min_duty = priv->fan->bios.max_duty;
213}
214
215int
216nouveau_therm_fan_init(struct nouveau_therm *therm)
217{
218 return 0;
219}
220
221int
222nouveau_therm_fan_fini(struct nouveau_therm *therm, bool suspend)
223{
224 struct nouveau_therm_priv *priv = (void *)therm;
225 struct nouveau_timer *ptimer = nouveau_timer(therm);
226
227 if (suspend)
228 ptimer->alarm_cancel(ptimer, &priv->fan->alarm);
229 return 0;
230}
231
232int
233nouveau_therm_fan_ctor(struct nouveau_therm *therm)
234{
235 struct nouveau_therm_priv *priv = (void *)therm;
236 struct nouveau_gpio *gpio = nouveau_gpio(therm);
237 struct nouveau_bios *bios = nouveau_bios(therm);
238 struct dcb_gpio_func func;
239 int ret;
240
241 /* attempt to locate a drivable fan, and determine control method */
242 ret = gpio->find(gpio, 0, DCB_GPIO_FAN, 0xff, &func);
243 if (ret == 0) {
244 /* FIXME: is this really the place to perform such checks ? */
245 if (func.line != 16 && func.log[0] & DCB_GPIO_LOG_DIR_IN) {
246 nv_debug(therm, "GPIO_FAN is in input mode\n");
247 ret = -EINVAL;
248 } else {
249 ret = nouveau_fanpwm_create(therm, &func);
250 if (ret != 0)
251 ret = nouveau_fantog_create(therm, &func);
252 }
253 }
254
255 /* no controllable fan found, create a dummy fan module */
256 if (ret != 0) {
257 ret = nouveau_fannil_create(therm);
258 if (ret)
259 return ret;
260 }
261
262 nv_info(therm, "FAN control: %s\n", priv->fan->type);
263
264 /* read the current speed, it is useful when resuming */
265 priv->fan->percent = nouveau_therm_fan_get(therm);
266
267 /* attempt to detect a tachometer connection */
268 ret = gpio->find(gpio, 0, DCB_GPIO_FAN_SENSE, 0xff, &priv->fan->tach);
269 if (ret)
270 priv->fan->tach.func = DCB_GPIO_UNUSED;
271
272 /* initialise fan bump/slow update handling */
273 priv->fan->parent = therm;
274 nouveau_alarm_init(&priv->fan->alarm, nouveau_fan_alarm);
275 spin_lock_init(&priv->fan->lock);
276
277 /* other random init... */
278 nouveau_therm_fan_set_defaults(therm);
279 nvbios_perf_fan_parse(bios, &priv->fan->perf);
280 if (!nvbios_fan_parse(bios, &priv->fan->bios)) {
281 nv_debug(therm, "parsing the fan table failed\n");
282 if (nvbios_therm_fan_parse(bios, &priv->fan->bios))
283 nv_error(therm, "parsing both fan tables failed\n");
284 }
285 nouveau_therm_fan_safety_checks(therm);
286 return 0;
287}
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