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