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
37struct nvkm_fanpwm {
38	struct nvkm_fan base;
39	struct dcb_gpio_func func;
40};
41
42static int
43nvkm_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
63static int
64nvkm_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
89int
90nvkm_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