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

   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, int index,
 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, index, &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, int index, 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, index, gk20a_cvb_coef,
 185                                ARRAY_SIZE(gk20a_cvb_coef), 0, volt);
 186 }