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         struct nvkm_subdev *subdev = &volt->subdev;
  50         if (volt->vid_set) {
  51                 int i, ret = -EINVAL;
  52                 for (i = 0; i < volt->vid_nr; i++) {
  53                         if (volt->vid[i].uv == uv) {
  54                                 ret = volt->vid_set(volt, volt->vid[i].vid);
  55                                 nvkm_debug(subdev, "set %duv: %d\n", uv, ret);
  56                                 break;
  57                         }
  58                 }
  59                 return ret;
  60         }
  61         return -ENODEV;
  62 }
  63
  64 static int
  65 nvkm_volt_map(struct nvkm_volt *volt, u8 id)
  66 {
  67         struct nvkm_bios *bios = nvkm_bios(volt);
  68         struct nvbios_vmap_entry info;
  69         u8  ver, len;
  70         u16 vmap;
  71
  72         vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);
  73         if (vmap) {
  74                 if (info.link != 0xff) {
  75                         int ret = nvkm_volt_map(volt, info.link);
  76                         if (ret < 0)
  77                                 return ret;
  78                         info.min += ret;
  79                 }
  80                 return info.min;
  81         }
  82
  83         return id ? id * 10000 : -ENODEV;
  84 }
  85
  86 static int
  87 nvkm_volt_set_id(struct nvkm_volt *volt, u8 id, int condition)
  88 {
  89         int ret = nvkm_volt_map(volt, id);
  90         if (ret >= 0) {
  91                 int prev = nvkm_volt_get(volt);
  92                 if (!condition || prev < 0 ||
  93                     (condition < 0 && ret < prev) ||
  94                     (condition > 0 && ret > prev)) {
  95                         ret = nvkm_volt_set(volt, ret);
  96                 } else {
  97                         ret = 0;
  98                 }
  99         }
 100         return ret;
 101 }
 102
 103 static void
 104 nvkm_volt_parse_bios(struct nvkm_bios *bios, struct nvkm_volt *volt)
 105 {
 106         struct nvbios_volt_entry ivid;
 107         struct nvbios_volt info;
 108         u8  ver, hdr, cnt, len;
 109         u16 data;
 110         int i;
 111
 112         data = nvbios_volt_parse(bios, &ver, &hdr, &cnt, &len, &info);
 113         if (data && info.vidmask && info.base && info.step) {
 114                 for (i = 0; i < info.vidmask + 1; i++) {
 115                         if (info.base >= info.min &&
 116                                 info.base <= info.max) {
 117                                 volt->vid[volt->vid_nr].uv = info.base;
 118                                 volt->vid[volt->vid_nr].vid = i;
 119                                 volt->vid_nr++;
 120                         }
 121                         info.base += info.step;
 122                 }
 123                 volt->vid_mask = info.vidmask;
 124         } else if (data && info.vidmask) {
 125                 for (i = 0; i < cnt; i++) {
 126                         data = nvbios_volt_entry_parse(bios, i, &ver, &hdr,
 127                                                        &ivid);
 128                         if (data) {
 129                                 volt->vid[volt->vid_nr].uv = ivid.voltage;
 130                                 volt->vid[volt->vid_nr].vid = ivid.vid;
 131                                 volt->vid_nr++;
 132                         }
 133                 }
 134                 volt->vid_mask = info.vidmask;
 135         }
 136 }
 137
 138 int
 139 _nvkm_volt_init(struct nvkm_object *object)
 140 {
 141         struct nvkm_volt *volt = (void *)object;
 142         struct nvkm_subdev *subdev = &volt->subdev;
 143         int ret;
 144
 145         ret = nvkm_subdev_init_old(&volt->subdev);
 146         if (ret)
 147                 return ret;
 148
 149         ret = volt->get(volt);
 150         if (ret < 0) {
 151                 if (ret != -ENODEV)
 152                         nvkm_debug(subdev, "current voltage unknown\n");
 153                 return 0;
 154         }
 155
 156         nvkm_debug(subdev, "current voltage: %duv\n", ret);
 157         return 0;
 158 }
 159
 160 void
 161 _nvkm_volt_dtor(struct nvkm_object *object)
 162 {
 163         struct nvkm_volt *volt = (void *)object;
 164         nvkm_subdev_destroy(&volt->subdev);
 165 }
 166
 167 int
 168 nvkm_volt_create_(struct nvkm_object *parent, struct nvkm_object *engine,
 169                   struct nvkm_oclass *oclass, int length, void **pobject)
 170 {
 171         struct nvkm_device *device = (void *)parent;
 172         struct nvkm_bios *bios = device->bios;
 173         struct nvkm_volt *volt;
 174         int ret, i;
 175
 176         ret = nvkm_subdev_create_(parent, engine, oclass, 0, "VOLT",
 177                                   "voltage", length, pobject);
 178         volt = *pobject;
 179         if (ret)
 180                 return ret;
 181
 182         volt->get = nvkm_volt_get;
 183         volt->set = nvkm_volt_set;
 184         volt->set_id = nvkm_volt_set_id;
 185
 186         /* Assuming the non-bios device should build the voltage table later */
 187         if (bios)
 188                 nvkm_volt_parse_bios(bios, volt);
 189
 190         if (volt->vid_nr) {
 191                 for (i = 0; i < volt->vid_nr; i++) {
 192                         nvkm_debug(&volt->subdev, "VID %02x: %duv\n",
 193                                    volt->vid[i].vid, volt->vid[i].uv);
 194                 }
 195
 196                 /*XXX: this is an assumption.. there probably exists boards
 197                  * out there with i2c-connected voltage controllers too..
 198                  */
 199                 ret = nvkm_voltgpio_init(volt);
 200                 if (ret == 0) {
 201                         volt->vid_get = nvkm_voltgpio_get;
 202                         volt->vid_set = nvkm_voltgpio_set;
 203                 }
 204         }
 205
 206         return ret;
 207 }