1 /* $NetBSD: nouveau_nvkm_subdev_therm_fanpwm.c,v 1.3 2021/12/18 23:45:41 riastradh Exp $ */
2
3 /*
4 * Copyright 2012 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Ben Skeggs
25 * Martin Peres
26 */
27 #include <sys/cdefs.h>
28 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_therm_fanpwm.c,v 1.3 2021/12/18 23:45:41 riastradh Exp $");
29
30 #include "priv.h"
31
32 #include <core/option.h>
33 #include <subdev/bios.h>
34 #include <subdev/bios/fan.h>
35 #include <subdev/gpio.h>
36
37 struct nvkm_fanpwm {
38 struct nvkm_fan base;
39 struct dcb_gpio_func func;
40 };
41
42 static int
nvkm_fanpwm_get(struct nvkm_therm * therm)43 nvkm_fanpwm_get(struct nvkm_therm *therm)
44 {
45 struct nvkm_fanpwm *fan = (void *)therm->fan;
46 struct nvkm_device *device = therm->subdev.device;
47 struct nvkm_gpio *gpio = device->gpio;
48 int card_type = device->card_type;
49 u32 divs, duty;
50 int ret;
51
52 ret = therm->func->pwm_get(therm, fan->func.line, &divs, &duty);
53 if (ret == 0 && divs) {
54 divs = max(divs, duty);
55 if (card_type <= NV_40 || (fan->func.log[0] & 1))
56 duty = divs - duty;
57 return (duty * 100) / divs;
58 }
59
60 return nvkm_gpio_get(gpio, 0, fan->func.func, fan->func.line) * 100;
61 }
62
63 static int
nvkm_fanpwm_set(struct nvkm_therm * therm,int percent)64 nvkm_fanpwm_set(struct nvkm_therm *therm, int percent)
65 {
66 struct nvkm_fanpwm *fan = (void *)therm->fan;
67 int card_type = therm->subdev.device->card_type;
68 u32 divs, duty;
69 int ret;
70
71 divs = fan->base.perf.pwm_divisor;
72 if (fan->base.bios.pwm_freq) {
73 divs = 1;
74 if (therm->func->pwm_clock)
75 divs = therm->func->pwm_clock(therm, fan->func.line);
76 divs /= fan->base.bios.pwm_freq;
77 }
78
79 duty = ((divs * percent) + 99) / 100;
80 if (card_type <= NV_40 || (fan->func.log[0] & 1))
81 duty = divs - duty;
82
83 ret = therm->func->pwm_set(therm, fan->func.line, divs, duty);
84 if (ret == 0)
85 ret = therm->func->pwm_ctrl(therm, fan->func.line, true);
86 return ret;
87 }
88
89 int
nvkm_fanpwm_create(struct nvkm_therm * therm,struct dcb_gpio_func * func)90 nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
91 {
92 struct nvkm_device *device = therm->subdev.device;
93 struct nvkm_bios *bios = device->bios;
94 struct nvkm_fanpwm *fan;
95 struct nvbios_therm_fan info = {};
96 u32 divs, duty;
97
98 nvbios_fan_parse(bios, &info);
99
100 if (!nvkm_boolopt(device->cfgopt, "NvFanPWM", func->param) ||
101 !therm->func->pwm_ctrl || info.type == NVBIOS_THERM_FAN_TOGGLE ||
102 therm->func->pwm_get(therm, func->line, &divs, &duty) == -ENODEV)
103 return -ENODEV;
104
105 fan = kzalloc(sizeof(*fan), GFP_KERNEL);
106 therm->fan = &fan->base;
107 if (!fan)
108 return -ENOMEM;
109
110 fan->base.type = "PWM";
111 fan->base.get = nvkm_fanpwm_get;
112 fan->base.set = nvkm_fanpwm_set;
113 fan->func = *func;
114 return 0;
115 }
116