1/*
2 * Copyright 2015 Martin Peres
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: Martin Peres
23 */
24#include "priv.h"
25
26#include <subdev/volt.h>
27#include <subdev/gpio.h>
28#include <subdev/bios.h>
29#include <subdev/bios/volt.h>
30
31#define gk104_volt(p) container_of((p), struct gk104_volt, base)
32struct gk104_volt {
33	struct nvkm_volt base;
34	struct nvbios_volt bios;
35};
36
37int
38gk104_volt_get(struct nvkm_volt *base)
39{
40	struct nvbios_volt *bios = &gk104_volt(base)->bios;
41	struct nvkm_device *device = base->subdev.device;
42	u32 div, duty;
43
44	div  = nvkm_rd32(device, 0x20340);
45	duty = nvkm_rd32(device, 0x20344);
46
47	return bios->base + bios->pwm_range * duty / div;
48}
49
50int
51gk104_volt_set(struct nvkm_volt *base, u32 uv)
52{
53	struct nvbios_volt *bios = &gk104_volt(base)->bios;
54	struct nvkm_device *device = base->subdev.device;
55	u32 div, duty;
56
57	/* the blob uses this crystal frequency, let's use it too. */
58	div = 27648000 / bios->pwm_freq;
59	duty = (uv - bios->base) * div / bios->pwm_range;
60
61	nvkm_wr32(device, 0x20340, div);
62	nvkm_wr32(device, 0x20344, 0x80000000 | duty);
63
64	return 0;
65}
66
67static const struct nvkm_volt_func
68gk104_volt_pwm = {
69	.volt_get = gk104_volt_get,
70	.volt_set = gk104_volt_set,
71}, gk104_volt_gpio = {
72	.vid_get = nvkm_voltgpio_get,
73	.vid_set = nvkm_voltgpio_set,
74};
75
76int
77gk104_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt)
78{
79	const struct nvkm_volt_func *volt_func = &gk104_volt_gpio;
80	struct dcb_gpio_func gpio;
81	struct nvbios_volt bios;
82	struct gk104_volt *volt;
83	u8 ver, hdr, cnt, len;
84	const char *mode;
85
86	if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios))
87		return 0;
88
89	if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) &&
90	    bios.type == NVBIOS_VOLT_PWM) {
91		volt_func = &gk104_volt_pwm;
92	}
93
94	if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL)))
95		return -ENOMEM;
96	nvkm_volt_ctor(volt_func, device, index, &volt->base);
97	*pvolt = &volt->base;
98	volt->bios = bios;
99
100	/* now that we have a subdev, we can show an error if we found through
101	 * the voltage table that we were supposed to use the PWN mode but we
102	 * did not find the right GPIO for it.
103	 */
104	if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) {
105		nvkm_error(&volt->base.subdev,
106			   "Type mismatch between the voltage table type and "
107			   "the GPIO table. Fallback to GPIO mode.\n");
108	}
109
110	if (volt_func == &gk104_volt_gpio) {
111		nvkm_voltgpio_init(&volt->base);
112		mode = "GPIO";
113	} else
114		mode = "PWM";
115
116	nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode);
117
118	return 0;
119}
120