1/*	$NetBSD: nouveau_nvkm_subdev_volt_gk20a.c,v 1.3 2021/12/18 23:45:42 riastradh Exp $	*/
2
3/*
4 * Copyright (c) 2014-2016, NVIDIA CORPORATION. All rights reserved.
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 */
24#include <sys/cdefs.h>
25__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_volt_gk20a.c,v 1.3 2021/12/18 23:45:42 riastradh Exp $");
26
27#define gk20a_volt(p) container_of((p), struct gk20a_volt, base)
28#include "priv.h"
29
30#include <core/tegra.h>
31
32#include "gk20a.h"
33
34static const struct cvb_coef gk20a_cvb_coef[] = {
35	/* MHz,        c0,     c1,   c2,    c3,     c4,   c5 */
36	/*  72 */ { 1209886, -36468,  515,   417, -13123,  203},
37	/* 108 */ { 1130804, -27659,  296,   298, -10834,  221},
38	/* 180 */ { 1162871, -27110,  247,   238, -10681,  268},
39	/* 252 */ { 1220458, -28654,  247,   179, -10376,  298},
40	/* 324 */ { 1280953, -30204,  247,   119,  -9766,  304},
41	/* 396 */ { 1344547, -31777,  247,   119,  -8545,  292},
42	/* 468 */ { 1420168, -34227,  269,    60,  -7172,  256},
43	/* 540 */ { 1490757, -35955,  274,    60,  -5188,  197},
44	/* 612 */ { 1599112, -42583,  398,     0,  -1831,  119},
45	/* 648 */ { 1366986, -16459, -274,     0,  -3204,   72},
46	/* 684 */ { 1391884, -17078, -274,   -60,  -1526,   30},
47	/* 708 */ { 1415522, -17497, -274,   -60,   -458,    0},
48	/* 756 */ { 1464061, -18331, -274,  -119,   1831,  -72},
49	/* 804 */ { 1524225, -20064, -254,  -119,   4272, -155},
50	/* 852 */ { 1608418, -21643, -269,     0,    763,  -48},
51};
52
53/**
54 * cvb_mv = ((c2 * speedo / s_scale + c1) * speedo / s_scale + c0)
55 */
56static inline int
57gk20a_volt_get_cvb_voltage(int speedo, int s_scale, const struct cvb_coef *coef)
58{
59	int mv;
60
61	mv = DIV_ROUND_CLOSEST(coef->c2 * speedo, s_scale);
62	mv = DIV_ROUND_CLOSEST((mv + coef->c1) * speedo, s_scale) + coef->c0;
63	return mv;
64}
65
66/**
67 * cvb_t_mv =
68 * ((c2 * speedo / s_scale + c1) * speedo / s_scale + c0) +
69 * ((c3 * speedo / s_scale + c4 + c5 * T / t_scale) * T / t_scale)
70 */
71static inline int
72gk20a_volt_get_cvb_t_voltage(int speedo, int temp, int s_scale, int t_scale,
73			     const struct cvb_coef *coef)
74{
75	int cvb_mv, mv;
76
77	cvb_mv = gk20a_volt_get_cvb_voltage(speedo, s_scale, coef);
78
79	mv = DIV_ROUND_CLOSEST(coef->c3 * speedo, s_scale) + coef->c4 +
80		DIV_ROUND_CLOSEST(coef->c5 * temp, t_scale);
81	mv = DIV_ROUND_CLOSEST(mv * temp, t_scale) + cvb_mv;
82	return mv;
83}
84
85static int
86gk20a_volt_calc_voltage(const struct cvb_coef *coef, int speedo)
87{
88	static const int v_scale = 1000;
89	int mv;
90
91	mv = gk20a_volt_get_cvb_t_voltage(speedo, -10, 100, 10, coef);
92	mv = DIV_ROUND_UP(mv, v_scale);
93
94	return mv * 1000;
95}
96
97static int
98gk20a_volt_vid_get(struct nvkm_volt *base)
99{
100	struct gk20a_volt *volt = gk20a_volt(base);
101	int i, uv;
102
103	uv = regulator_get_voltage(volt->vdd);
104
105	for (i = 0; i < volt->base.vid_nr; i++)
106		if (volt->base.vid[i].uv >= uv)
107			return i;
108
109	return -EINVAL;
110}
111
112static int
113gk20a_volt_vid_set(struct nvkm_volt *base, u8 vid)
114{
115	struct gk20a_volt *volt = gk20a_volt(base);
116	struct nvkm_subdev *subdev = &volt->base.subdev;
117
118	nvkm_debug(subdev, "set voltage as %duv\n", volt->base.vid[vid].uv);
119	return regulator_set_voltage(volt->vdd, volt->base.vid[vid].uv, 1200000);
120}
121
122static int
123gk20a_volt_set_id(struct nvkm_volt *base, u8 id, int condition)
124{
125	struct gk20a_volt *volt = gk20a_volt(base);
126	struct nvkm_subdev *subdev = &volt->base.subdev;
127	int prev_uv = regulator_get_voltage(volt->vdd);
128	int target_uv = volt->base.vid[id].uv;
129	int ret;
130
131	nvkm_debug(subdev, "prev=%d, target=%d, condition=%d\n",
132		   prev_uv, target_uv, condition);
133	if (!condition ||
134		(condition < 0 && target_uv < prev_uv) ||
135		(condition > 0 && target_uv > prev_uv)) {
136		ret = gk20a_volt_vid_set(&volt->base, volt->base.vid[id].vid);
137	} else {
138		ret = 0;
139	}
140
141	return ret;
142}
143
144static const struct nvkm_volt_func
145gk20a_volt = {
146	.vid_get = gk20a_volt_vid_get,
147	.vid_set = gk20a_volt_vid_set,
148	.set_id = gk20a_volt_set_id,
149};
150
151int
152gk20a_volt_ctor(struct nvkm_device *device, int index,
153		const struct cvb_coef *coefs, int nb_coefs,
154		int vmin, struct gk20a_volt *volt)
155{
156	struct nvkm_device_tegra *tdev = device->func->tegra(device);
157	int i, uv;
158
159	nvkm_volt_ctor(&gk20a_volt, device, index, &volt->base);
160
161	uv = regulator_get_voltage(tdev->vdd);
162	nvkm_debug(&volt->base.subdev, "the default voltage is %duV\n", uv);
163
164	volt->vdd = tdev->vdd;
165
166	volt->base.vid_nr = nb_coefs;
167	for (i = 0; i < volt->base.vid_nr; i++) {
168		volt->base.vid[i].vid = i;
169		volt->base.vid[i].uv = max(
170			gk20a_volt_calc_voltage(&coefs[i], tdev->gpu_speedo),
171			vmin);
172		nvkm_debug(&volt->base.subdev, "%2d: vid=%d, uv=%d\n", i,
173			   volt->base.vid[i].vid, volt->base.vid[i].uv);
174	}
175
176	return 0;
177}
178
179int
180gk20a_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt)
181{
182	struct gk20a_volt *volt;
183
184	volt = kzalloc(sizeof(*volt), GFP_KERNEL);
185	if (!volt)
186		return -ENOMEM;
187	*pvolt = &volt->base;
188
189	return gk20a_volt_ctor(device, index, gk20a_cvb_coef,
190			       ARRAY_SIZE(gk20a_cvb_coef), 0, volt);
191}
192