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 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 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 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 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 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 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 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 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
Indexes created Mon Sep 22 13:09:51 GMT 2025