kernel/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c

   1 /*
   2  * Copyright 2013 Red Hat Inc.
   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 COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24 #include <subdev/volt.h>
  25 #include <subdev/bios.h>
  26 #include <subdev/bios/vmap.h>
  27 #include <subdev/bios/volt.h>
  28
  29 static int
  30 nvkm_volt_get(struct nvkm_volt *volt)
  31 {
  32         if (volt->vid_get) {
  33                 int ret = volt->vid_get(volt), i;
  34                 if (ret >= 0) {
  35                         for (i = 0; i < volt->vid_nr; i++) {
  36                                 if (volt->vid[i].vid == ret)
  37                                         return volt->vid[i].uv;
  38                         }
  39                         ret = -EINVAL;
  40                 }
  41                 return ret;
  42         }
  43         return -ENODEV;
  44 }
  45
  46 static int
  47 nvkm_volt_set(struct nvkm_volt *volt, u32 uv)
  48 {
  49         if (volt->vid_set) {
  50                 int i, ret = -EINVAL;
  51                 for (i = 0; i < volt->vid_nr; i++) {
  52                         if (volt->vid[i].uv == uv) {
  53                                 ret = volt->vid_set(volt, volt->vid[i].vid);
  54                                 nv_debug(volt, "set %duv: %d\n", uv, ret);
  55                                 break;
  56                         }
  57                 }
  58                 return ret;
  59         }
  60         return -ENODEV;
  61 }
  62
  63 static int
  64 nvkm_volt_map(struct nvkm_volt *volt, u8 id)
  65 {
  66         struct nvkm_bios *bios = nvkm_bios(volt);
  67         struct nvbios_vmap_entry info;
  68         u8  ver, len;
  69         u16 vmap;
  70
  71         vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);
  72         if (vmap) {
  73                 if (info.link != 0xff) {
  74                         int ret = nvkm_volt_map(volt, info.link);
  75                         if (ret < 0)
  76                                 return ret;
  77                         info.min += ret;
  78                 }
  79                 return info.min;
  80         }
  81
  82         return id ? id * 10000 : -ENODEV;
  83 }
  84
  85 static int
  86 nvkm_volt_set_id(struct nvkm_volt *volt, u8 id, int condition)
  87 {
  88         int ret = nvkm_volt_map(volt, id);
  89         if (ret >= 0) {
  90                 int prev = nvkm_volt_get(volt);
  91                 if (!condition || prev < 0 ||
  92                     (condition < 0 && ret < prev) ||
  93                     (condition > 0 && ret > prev)) {
  94                         ret = nvkm_volt_set(volt, ret);
  95                 } else {
  96                         ret = 0;
  97                 }
  98         }
  99         return ret;
 100 }
 101
 102 static void
 103 nvkm_volt_parse_bios(struct nvkm_bios *bios, struct nvkm_volt *volt)
 104 {
 105         struct nvbios_volt_entry ivid;
 106         struct nvbios_volt info;
 107         u8  ver, hdr, cnt, len;
 108         u16 data;
 109         int i;
 110
 111         data = nvbios_volt_parse(bios, &ver, &hdr, &cnt, &len, &info);
 112         if (data && info.vidmask && info.base && info.step) {
 113                 for (i = 0; i < info.vidmask + 1; i++) {
 114                         if (info.base >= info.min &&
 115                                 info.base <= info.max) {
 116                                 volt->vid[volt->vid_nr].uv = info.base;
 117                                 volt->vid[volt->vid_nr].vid = i;
 118                                 volt->vid_nr++;
 119                         }
 120                         info.base += info.step;
 121                 }
 122                 volt->vid_mask = info.vidmask;
 123         } else if (data && info.vidmask) {
 124                 for (i = 0; i < cnt; i++) {
 125                         data = nvbios_volt_entry_parse(bios, i, &ver, &hdr,
 126                                                        &ivid);
 127                         if (data) {
 128                                 volt->vid[volt->vid_nr].uv = ivid.voltage;
 129                                 volt->vid[volt->vid_nr].vid = ivid.vid;
 130                                 volt->vid_nr++;
 131                         }
 132                 }
 133                 volt->vid_mask = info.vidmask;
 134         }
 135 }
 136
 137 int
 138 _nvkm_volt_init(struct nvkm_object *object)
 139 {
 140         struct nvkm_volt *volt = (void *)object;
 141         int ret;
 142
 143         ret = nvkm_subdev_init(&volt->base);
 144         if (ret)
 145                 return ret;
 146
 147         ret = volt->get(volt);
 148         if (ret < 0) {
 149                 if (ret != -ENODEV)
 150                         nv_debug(volt, "current voltage unknown\n");
 151                 return 0;
 152         }
 153
 154         nv_info(volt, "GPU voltage: %duv\n", ret);
 155         return 0;
 156 }
 157
 158 void
 159 _nvkm_volt_dtor(struct nvkm_object *object)
 160 {
 161         struct nvkm_volt *volt = (void *)object;
 162         nvkm_subdev_destroy(&volt->base);
 163 }
 164
 165 int
 166 nvkm_volt_create_(struct nvkm_object *parent, struct nvkm_object *engine,
 167                   struct nvkm_oclass *oclass, int length, void **pobject)
 168 {
 169         struct nvkm_bios *bios = nvkm_bios(parent);
 170         struct nvkm_volt *volt;
 171         int ret, i;
 172
 173         ret = nvkm_subdev_create_(parent, engine, oclass, 0, "VOLT",
 174                                   "voltage", length, pobject);
 175         volt = *pobject;
 176         if (ret)
 177                 return ret;
 178
 179         volt->get = nvkm_volt_get;
 180         volt->set = nvkm_volt_set;
 181         volt->set_id = nvkm_volt_set_id;
 182
 183         /* Assuming the non-bios device should build the voltage table later */
 184         if (bios)
 185                 nvkm_volt_parse_bios(bios, volt);
 186
 187         if (volt->vid_nr) {
 188                 for (i = 0; i < volt->vid_nr; i++) {
 189                         nv_debug(volt, "VID %02x: %duv\n",
 190                                  volt->vid[i].vid, volt->vid[i].uv);
 191                 }
 192
 193                 /*XXX: this is an assumption.. there probably exists boards
 194                  * out there with i2c-connected voltage controllers too..
 195                  */
 196                 ret = nvkm_voltgpio_init(volt);
 197                 if (ret == 0) {
 198                         volt->vid_get = nvkm_voltgpio_get;
 199                         volt->vid_set = nvkm_voltgpio_set;
 200                 }
 201         }
 202
 203         return ret;
 204 }