Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / gpu / drm / nouveau / nvkm / subdev / therm / fanpwm.c
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 <core/device.h>
28 #include <core/option.h>
29 #include <subdev/bios.h>
30 #include <subdev/bios/fan.h>
31 #include <subdev/gpio.h>
32
33 struct nvkm_fanpwm_priv {
34         struct nvkm_fan base;
35         struct dcb_gpio_func func;
36 };
37
38 static int
39 nvkm_fanpwm_get(struct nvkm_therm *therm)
40 {
41         struct nvkm_therm_priv *tpriv = (void *)therm;
42         struct nvkm_fanpwm_priv *priv = (void *)tpriv->fan;
43         struct nvkm_gpio *gpio = nvkm_gpio(therm);
44         int card_type = nv_device(therm)->card_type;
45         u32 divs, duty;
46         int ret;
47
48         ret = therm->pwm_get(therm, priv->func.line, &divs, &duty);
49         if (ret == 0 && divs) {
50                 divs = max(divs, duty);
51                 if (card_type <= NV_40 || (priv->func.log[0] & 1))
52                         duty = divs - duty;
53                 return (duty * 100) / divs;
54         }
55
56         return gpio->get(gpio, 0, priv->func.func, priv->func.line) * 100;
57 }
58
59 static int
60 nvkm_fanpwm_set(struct nvkm_therm *therm, int percent)
61 {
62         struct nvkm_therm_priv *tpriv = (void *)therm;
63         struct nvkm_fanpwm_priv *priv = (void *)tpriv->fan;
64         int card_type = nv_device(therm)->card_type;
65         u32 divs, duty;
66         int ret;
67
68         divs = priv->base.perf.pwm_divisor;
69         if (priv->base.bios.pwm_freq) {
70                 divs = 1;
71                 if (therm->pwm_clock)
72                         divs = therm->pwm_clock(therm, priv->func.line);
73                 divs /= priv->base.bios.pwm_freq;
74         }
75
76         duty = ((divs * percent) + 99) / 100;
77         if (card_type <= NV_40 || (priv->func.log[0] & 1))
78                 duty = divs - duty;
79
80         ret = therm->pwm_set(therm, priv->func.line, divs, duty);
81         if (ret == 0)
82                 ret = therm->pwm_ctrl(therm, priv->func.line, true);
83         return ret;
84 }
85
86 int
87 nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
88 {
89         struct nvkm_device *device = nv_device(therm);
90         struct nvkm_therm_priv *tpriv = (void *)therm;
91         struct nvkm_bios *bios = nvkm_bios(therm);
92         struct nvkm_fanpwm_priv *priv;
93         struct nvbios_therm_fan fan;
94         u32 divs, duty;
95
96         nvbios_fan_parse(bios, &fan);
97
98         if (!nvkm_boolopt(device->cfgopt, "NvFanPWM", func->param) ||
99             !therm->pwm_ctrl || fan.type == NVBIOS_THERM_FAN_TOGGLE ||
100              therm->pwm_get(therm, func->line, &divs, &duty) == -ENODEV)
101                 return -ENODEV;
102
103         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
104         tpriv->fan = &priv->base;
105         if (!priv)
106                 return -ENOMEM;
107
108         priv->base.type = "PWM";
109         priv->base.get = nvkm_fanpwm_get;
110         priv->base.set = nvkm_fanpwm_set;
111         priv->func = *func;
112         return 0;
113 }