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
34 static 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 */
56 static inline int
gk20a_volt_get_cvb_voltage(int speedo,int s_scale,const struct cvb_coef * coef)57 gk20a_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 */
71 static inline int
gk20a_volt_get_cvb_t_voltage(int speedo,int temp,int s_scale,int t_scale,const struct cvb_coef * coef)72 gk20a_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
85 static int
gk20a_volt_calc_voltage(const struct cvb_coef * coef,int speedo)86 gk20a_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
97 static int
gk20a_volt_vid_get(struct nvkm_volt * base)98 gk20a_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
112 static int
gk20a_volt_vid_set(struct nvkm_volt * base,u8 vid)113 gk20a_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
122 static int
gk20a_volt_set_id(struct nvkm_volt * base,u8 id,int condition)123 gk20a_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
144 static const struct nvkm_volt_func
145 gk20a_volt = {
146 .vid_get = gk20a_volt_vid_get,
147 .vid_set = gk20a_volt_vid_set,
148 .set_id = gk20a_volt_set_id,
149 };
150
151 int
gk20a_volt_ctor(struct nvkm_device * device,int index,const struct cvb_coef * coefs,int nb_coefs,int vmin,struct gk20a_volt * volt)152 gk20a_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
179 int
gk20a_volt_new(struct nvkm_device * device,int index,struct nvkm_volt ** pvolt)180 gk20a_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