1/*	$NetBSD: nouveau_nvkm_subdev_volt_gk104.c,v 1.4 2021/12/18 23:45:42 riastradh Exp $	*/
2
3/*
4 * Copyright 2015 Martin Peres
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: Martin Peres
25 */
26#include <sys/cdefs.h>
27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_volt_gk104.c,v 1.4 2021/12/18 23:45:42 riastradh Exp $");
28
29#include "priv.h"
30
31#include <subdev/volt.h>
32#include <subdev/gpio.h>
33#include <subdev/bios.h>
34#include <subdev/bios/volt.h>
35#include <subdev/fuse.h>
36
37#define gk104_volt(p) container_of((p), struct gk104_volt, base)
38struct gk104_volt {
39	struct nvkm_volt base;
40	struct nvbios_volt bios;
41};
42
43static int
44gk104_volt_get(struct nvkm_volt *base)
45{
46	struct nvbios_volt *bios = &gk104_volt(base)->bios;
47	struct nvkm_device *device = base->subdev.device;
48	u32 div, duty;
49
50	div  = nvkm_rd32(device, 0x20340);
51	duty = nvkm_rd32(device, 0x20344);
52
53	return bios->base + bios->pwm_range * duty / div;
54}
55
56static int
57gk104_volt_set(struct nvkm_volt *base, u32 uv)
58{
59	struct nvbios_volt *bios = &gk104_volt(base)->bios;
60	struct nvkm_device *device = base->subdev.device;
61	u32 div, duty;
62
63	/* the blob uses this crystal frequency, let's use it too. */
64	div = 27648000 / bios->pwm_freq;
65	duty = DIV_ROUND_UP((uv - bios->base) * div, bios->pwm_range);
66
67	nvkm_wr32(device, 0x20340, div);
68	nvkm_wr32(device, 0x20344, 0x80000000 | duty);
69
70	return 0;
71}
72
73static int
74gk104_volt_speedo_read(struct nvkm_volt *volt)
75{
76	struct nvkm_device *device = volt->subdev.device;
77	struct nvkm_fuse *fuse = device->fuse;
78	int ret;
79
80	if (!fuse)
81		return -EINVAL;
82
83	nvkm_wr32(device, 0x122634, 0x0);
84	ret = nvkm_fuse_read(fuse, 0x3a8);
85	nvkm_wr32(device, 0x122634, 0x41);
86	return ret;
87}
88
89static const struct nvkm_volt_func
90gk104_volt_pwm = {
91	.oneinit = gf100_volt_oneinit,
92	.volt_get = gk104_volt_get,
93	.volt_set = gk104_volt_set,
94	.speedo_read = gk104_volt_speedo_read,
95}, gk104_volt_gpio = {
96	.oneinit = gf100_volt_oneinit,
97	.vid_get = nvkm_voltgpio_get,
98	.vid_set = nvkm_voltgpio_set,
99	.speedo_read = gk104_volt_speedo_read,
100};
101
102int
103gk104_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt)
104{
105	const struct nvkm_volt_func *volt_func = &gk104_volt_gpio;
106	struct dcb_gpio_func gpio;
107	struct nvbios_volt bios;
108	struct gk104_volt *volt;
109	u8 ver, hdr, cnt, len;
110	const char *mode;
111
112	if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios))
113		return 0;
114
115	if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) &&
116	    bios.type == NVBIOS_VOLT_PWM) {
117		volt_func = &gk104_volt_pwm;
118	}
119
120	if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL)))
121		return -ENOMEM;
122	nvkm_volt_ctor(volt_func, device, index, &volt->base);
123	*pvolt = &volt->base;
124	volt->bios = bios;
125
126	/* now that we have a subdev, we can show an error if we found through
127	 * the voltage table that we were supposed to use the PWN mode but we
128	 * did not find the right GPIO for it.
129	 */
130	if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) {
131		nvkm_error(&volt->base.subdev,
132			   "Type mismatch between the voltage table type and "
133			   "the GPIO table. Fallback to GPIO mode.\n");
134	}
135
136	if (volt_func == &gk104_volt_gpio) {
137		nvkm_voltgpio_init(&volt->base);
138		mode = "GPIO";
139	} else
140		mode = "PWM";
141
142	nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode);
143
144	return 0;
145}
146