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 "priv.h" 25 26 #include <subdev/bios.h> 27 #include <subdev/bios/vmap.h> 28 #include <subdev/bios/volt.h> 29 30 int 31 nvkm_volt_get(struct nvkm_volt *volt) 32 { 33 int ret = volt->func->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 44 static int 45 nvkm_volt_set(struct nvkm_volt *volt, u32 uv) 46 { 47 struct nvkm_subdev *subdev = &volt->subdev; 48 int i, ret = -EINVAL; 49 for (i = 0; i < volt->vid_nr; i++) { 50 if (volt->vid[i].uv == uv) { 51 ret = volt->func->vid_set(volt, volt->vid[i].vid); 52 nvkm_debug(subdev, "set %duv: %d\n", uv, ret); 53 break; 54 } 55 } 56 return ret; 57 } 58 59 static int 60 nvkm_volt_map(struct nvkm_volt *volt, u8 id) 61 { 62 struct nvkm_bios *bios = volt->subdev.device->bios; 63 struct nvbios_vmap_entry info; 64 u8 ver, len; 65 u16 vmap; 66 67 vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info); 68 if (vmap) { 69 if (info.link != 0xff) { 70 int ret = nvkm_volt_map(volt, info.link); 71 if (ret < 0) 72 return ret; 73 info.min += ret; 74 } 75 return info.min; 76 } 77 78 return id ? id * 10000 : -ENODEV; 79 } 80 81 int 82 nvkm_volt_set_id(struct nvkm_volt *volt, u8 id, int condition) 83 { 84 int ret; 85 86 if (volt->func->set_id) 87 return volt->func->set_id(volt, id, condition); 88 89 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 static int 139 nvkm_volt_init(struct nvkm_subdev *subdev) 140 { 141 struct nvkm_volt *volt = nvkm_volt(subdev); 142 int ret = nvkm_volt_get(volt); 143 if (ret < 0) { 144 if (ret != -ENODEV) 145 nvkm_debug(subdev, "current voltage unknown\n"); 146 return 0; 147 } 148 nvkm_debug(subdev, "current voltage: %duv\n", ret); 149 return 0; 150 } 151 152 static void * 153 nvkm_volt_dtor(struct nvkm_subdev *subdev) 154 { 155 return nvkm_volt(subdev); 156 } 157 158 static const struct nvkm_subdev_func 159 nvkm_volt = { 160 .dtor = nvkm_volt_dtor, 161 .init = nvkm_volt_init, 162 }; 163 164 void 165 nvkm_volt_ctor(const struct nvkm_volt_func *func, struct nvkm_device *device, 166 int index, struct nvkm_volt *volt) 167 { 168 struct nvkm_bios *bios = device->bios; 169 int i; 170 171 nvkm_subdev_ctor(&nvkm_volt, device, index, 0, &volt->subdev); 172 volt->func = func; 173 174 /* Assuming the non-bios device should build the voltage table later */ 175 if (bios) 176 nvkm_volt_parse_bios(bios, volt); 177 178 if (volt->vid_nr) { 179 for (i = 0; i < volt->vid_nr; i++) { 180 nvkm_debug(&volt->subdev, "VID %02x: %duv\n", 181 volt->vid[i].vid, volt->vid[i].uv); 182 } 183 } 184 } 185 186 int 187 nvkm_volt_new_(const struct nvkm_volt_func *func, struct nvkm_device *device, 188 int index, struct nvkm_volt **pvolt) 189 { 190 if (!(*pvolt = kzalloc(sizeof(**pvolt), GFP_KERNEL))) 191 return -ENOMEM; 192 nvkm_volt_ctor(func, device, index, *pvolt); 193 return 0; 194 } 195