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#include <subdev/fuse.h>
31
32#define gk104_volt(p) container_of((p), struct gk104_volt, base)
33struct gk104_volt {
34	struct nvkm_volt base;
35	struct nvbios_volt bios;
36};
37
38static int
39gk104_volt_get(struct nvkm_volt *base)
40{
41	struct nvbios_volt *bios = &gk104_volt(base)->bios;
42	struct nvkm_device *device = base->subdev.device;
43	u32 div, duty;
44
45	div  = nvkm_rd32(device, 0x20340);
46	duty = nvkm_rd32(device, 0x20344);
47
48	return bios->base + bios->pwm_range * duty / div;
49}
50
51static int
52gk104_volt_set(struct nvkm_volt *base, u32 uv)
53{
54	struct nvbios_volt *bios = &gk104_volt(base)->bios;
55	struct nvkm_device *device = base->subdev.device;
56	u32 div, duty;
57
58	/* the blob uses this crystal frequency, let's use it too. */
59	div = 27648000 / bios->pwm_freq;
60	duty = DIV_ROUND_UP((uv - bios->base) * div, bios->pwm_range);
61
62	nvkm_wr32(device, 0x20340, div);
63	nvkm_wr32(device, 0x20344, 0x80000000 | duty);
64
65	return 0;
66}
67
68static int
69gk104_volt_speedo_read(struct nvkm_volt *volt)
70{
71	struct nvkm_device *device = volt->subdev.device;
72	struct nvkm_fuse *fuse = device->fuse;
73	int ret;
74
75	if (!fuse)
76		return -EINVAL;
77
78	nvkm_wr32(device, 0x122634, 0x0);
79	ret = nvkm_fuse_read(fuse, 0x3a8);
80	nvkm_wr32(device, 0x122634, 0x41);
81	return ret;
82}
83
84static const struct nvkm_volt_func
85gk104_volt_pwm = {
86	.oneinit = gf100_volt_oneinit,
87	.volt_get = gk104_volt_get,
88	.volt_set = gk104_volt_set,
89	.speedo_read = gk104_volt_speedo_read,
90}, gk104_volt_gpio = {
91	.oneinit = gf100_volt_oneinit,
92	.vid_get = nvkm_voltgpio_get,
93	.vid_set = nvkm_voltgpio_set,
94	.speedo_read = gk104_volt_speedo_read,
95};
96
97int
98gk104_volt_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
99	       struct nvkm_volt **pvolt)
100{
101	const struct nvkm_volt_func *volt_func = &gk104_volt_gpio;
102	struct dcb_gpio_func gpio;
103	struct nvbios_volt bios;
104	struct gk104_volt *volt;
105	u8 ver, hdr, cnt, len;
106	const char *mode;
107
108	if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios))
109		return 0;
110
111	if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) &&
112	    bios.type == NVBIOS_VOLT_PWM) {
113		volt_func = &gk104_volt_pwm;
114	}
115
116	if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL)))
117		return -ENOMEM;
118	nvkm_volt_ctor(volt_func, device, type, inst, &volt->base);
119	*pvolt = &volt->base;
120	volt->bios = bios;
121
122	/* now that we have a subdev, we can show an error if we found through
123	 * the voltage table that we were supposed to use the PWN mode but we
124	 * did not find the right GPIO for it.
125	 */
126	if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) {
127		nvkm_error(&volt->base.subdev,
128			   "Type mismatch between the voltage table type and "
129			   "the GPIO table. Fallback to GPIO mode.\n");
130	}
131
132	if (volt_func == &gk104_volt_gpio) {
133		nvkm_voltgpio_init(&volt->base);
134		mode = "GPIO";
135	} else
136		mode = "PWM";
137
138	nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode);
139
140	return 0;
141}
142