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(&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 } 208