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 } 205