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 
29 static 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  */
51 static inline int
52 gk20a_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  */
66 static inline int
67 gk20a_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 
80 static int
81 gk20a_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 
92 static int
93 gk20a_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 
107 static int
108 gk20a_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 
117 static int
118 gk20a_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 
139 static const struct nvkm_volt_func
140 gk20a_volt = {
141 	.vid_get = gk20a_volt_vid_get,
142 	.vid_set = gk20a_volt_vid_set,
143 	.set_id = gk20a_volt_set_id,
144 };
145 
146 int
147 gk20a_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 
174 int
175 gk20a_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