drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk20a.c

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