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1/*2 * Copyright 2013 Red Hat Inc.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * 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 OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: Ben Skeggs23 */24#include "priv.h"25 26#include <subdev/bios.h>27#include <subdev/bios/vmap.h>28#include <subdev/bios/volt.h>29#include <subdev/therm.h>30 31int32nvkm_volt_get(struct nvkm_volt *volt)33{34 int ret, i;35 36 if (volt->func->volt_get)37 return volt->func->volt_get(volt);38 39 ret = volt->func->vid_get(volt);40 if (ret >= 0) {41 for (i = 0; i < volt->vid_nr; i++) {42 if (volt->vid[i].vid == ret)43 return volt->vid[i].uv;44 }45 ret = -EINVAL;46 }47 return ret;48}49 50static int51nvkm_volt_set(struct nvkm_volt *volt, u32 uv)52{53 struct nvkm_subdev *subdev = &volt->subdev;54 int i, ret = -EINVAL, best_err = volt->max_uv, best = -1;55 56 if (volt->func->volt_set)57 return volt->func->volt_set(volt, uv);58 59 for (i = 0; i < volt->vid_nr; i++) {60 int err = volt->vid[i].uv - uv;61 if (err < 0 || err > best_err)62 continue;63 64 best_err = err;65 best = i;66 if (best_err == 0)67 break;68 }69 70 if (best == -1) {71 nvkm_error(subdev, "couldn't set %iuv\n", uv);72 return ret;73 }74 75 ret = volt->func->vid_set(volt, volt->vid[best].vid);76 nvkm_debug(subdev, "set req %duv to %duv: %d\n", uv,77 volt->vid[best].uv, ret);78 return ret;79}80 81int82nvkm_volt_map_min(struct nvkm_volt *volt, u8 id)83{84 struct nvkm_bios *bios = volt->subdev.device->bios;85 struct nvbios_vmap_entry info;86 u8 ver, len;87 u32 vmap;88 89 vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);90 if (vmap) {91 if (info.link != 0xff) {92 int ret = nvkm_volt_map_min(volt, info.link);93 if (ret < 0)94 return ret;95 info.min += ret;96 }97 return info.min;98 }99 100 return id ? id * 10000 : -ENODEV;101}102 103int104nvkm_volt_map(struct nvkm_volt *volt, u8 id, u8 temp)105{106 struct nvkm_bios *bios = volt->subdev.device->bios;107 struct nvbios_vmap_entry info;108 u8 ver, len;109 u32 vmap;110 111 vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);112 if (vmap) {113 s64 result;114 115 if (volt->speedo < 0)116 return volt->speedo;117 118 if (ver == 0x10 || (ver == 0x20 && info.mode == 0)) {119 result = div64_s64((s64)info.arg[0], 10);120 result += div64_s64((s64)info.arg[1] * volt->speedo, 10);121 result += div64_s64((s64)info.arg[2] * volt->speedo * volt->speedo, 100000);122 } else if (ver == 0x20) {123 switch (info.mode) {124 /* 0x0 handled above! */125 case 0x1:126 result = ((s64)info.arg[0] * 15625) >> 18;127 result += ((s64)info.arg[1] * volt->speedo * 15625) >> 18;128 result += ((s64)info.arg[2] * temp * 15625) >> 10;129 result += ((s64)info.arg[3] * volt->speedo * temp * 15625) >> 18;130 result += ((s64)info.arg[4] * volt->speedo * volt->speedo * 15625) >> 30;131 result += ((s64)info.arg[5] * temp * temp * 15625) >> 18;132 break;133 case 0x3:134 result = (info.min + info.max) / 2;135 break;136 case 0x2:137 default:138 result = info.min;139 break;140 }141 } else {142 return -ENODEV;143 }144 145 result = min(max(result, (s64)info.min), (s64)info.max);146 147 if (info.link != 0xff) {148 int ret = nvkm_volt_map(volt, info.link, temp);149 if (ret < 0)150 return ret;151 result += ret;152 }153 return result;154 }155 156 return id ? id * 10000 : -ENODEV;157}158 159int160nvkm_volt_set_id(struct nvkm_volt *volt, u8 id, u8 min_id, u8 temp,161 int condition)162{163 int ret;164 165 if (volt->func->set_id)166 return volt->func->set_id(volt, id, condition);167 168 ret = nvkm_volt_map(volt, id, temp);169 if (ret >= 0) {170 int prev = nvkm_volt_get(volt);171 if (!condition || prev < 0 ||172 (condition < 0 && ret < prev) ||173 (condition > 0 && ret > prev)) {174 int min = nvkm_volt_map(volt, min_id, temp);175 if (min >= 0)176 ret = max(min, ret);177 ret = nvkm_volt_set(volt, ret);178 } else {179 ret = 0;180 }181 }182 return ret;183}184 185static void186nvkm_volt_parse_bios(struct nvkm_bios *bios, struct nvkm_volt *volt)187{188 struct nvkm_subdev *subdev = &bios->subdev;189 struct nvbios_volt_entry ivid;190 struct nvbios_volt info;191 u8 ver, hdr, cnt, len;192 u32 data;193 int i;194 195 data = nvbios_volt_parse(bios, &ver, &hdr, &cnt, &len, &info);196 if (data && info.vidmask && info.base && info.step && info.ranged) {197 nvkm_debug(subdev, "found ranged based VIDs\n");198 volt->min_uv = info.min;199 volt->max_uv = info.max;200 for (i = 0; i < info.vidmask + 1; i++) {201 if (info.base >= info.min &&202 info.base <= info.max) {203 volt->vid[volt->vid_nr].uv = info.base;204 volt->vid[volt->vid_nr].vid = i;205 volt->vid_nr++;206 }207 info.base += info.step;208 }209 volt->vid_mask = info.vidmask;210 } else if (data && info.vidmask && !info.ranged) {211 nvkm_debug(subdev, "found entry based VIDs\n");212 volt->min_uv = 0xffffffff;213 volt->max_uv = 0;214 for (i = 0; i < cnt; i++) {215 data = nvbios_volt_entry_parse(bios, i, &ver, &hdr,216 &ivid);217 if (data) {218 volt->vid[volt->vid_nr].uv = ivid.voltage;219 volt->vid[volt->vid_nr].vid = ivid.vid;220 volt->vid_nr++;221 volt->min_uv = min(volt->min_uv, ivid.voltage);222 volt->max_uv = max(volt->max_uv, ivid.voltage);223 }224 }225 volt->vid_mask = info.vidmask;226 } else if (data && info.type == NVBIOS_VOLT_PWM) {227 volt->min_uv = info.base;228 volt->max_uv = info.base + info.pwm_range;229 }230}231 232static int233nvkm_volt_speedo_read(struct nvkm_volt *volt)234{235 if (volt->func->speedo_read)236 return volt->func->speedo_read(volt);237 return -EINVAL;238}239 240static int241nvkm_volt_init(struct nvkm_subdev *subdev)242{243 struct nvkm_volt *volt = nvkm_volt(subdev);244 int ret = nvkm_volt_get(volt);245 if (ret < 0) {246 if (ret != -ENODEV)247 nvkm_debug(subdev, "current voltage unknown\n");248 return 0;249 }250 nvkm_debug(subdev, "current voltage: %duv\n", ret);251 return 0;252}253 254static int255nvkm_volt_oneinit(struct nvkm_subdev *subdev)256{257 struct nvkm_volt *volt = nvkm_volt(subdev);258 259 volt->speedo = nvkm_volt_speedo_read(volt);260 if (volt->speedo > 0)261 nvkm_debug(&volt->subdev, "speedo %x\n", volt->speedo);262 263 if (volt->func->oneinit)264 return volt->func->oneinit(volt);265 266 return 0;267}268 269static void *270nvkm_volt_dtor(struct nvkm_subdev *subdev)271{272 return nvkm_volt(subdev);273}274 275static const struct nvkm_subdev_func276nvkm_volt = {277 .dtor = nvkm_volt_dtor,278 .init = nvkm_volt_init,279 .oneinit = nvkm_volt_oneinit,280};281 282void283nvkm_volt_ctor(const struct nvkm_volt_func *func, struct nvkm_device *device,284 enum nvkm_subdev_type type, int inst, struct nvkm_volt *volt)285{286 struct nvkm_bios *bios = device->bios;287 int i;288 289 nvkm_subdev_ctor(&nvkm_volt, device, type, inst, &volt->subdev);290 volt->func = func;291 292 /* Assuming the non-bios device should build the voltage table later */293 if (bios) {294 u8 ver, hdr, cnt, len;295 struct nvbios_vmap vmap;296 297 nvkm_volt_parse_bios(bios, volt);298 nvkm_debug(&volt->subdev, "min: %iuv max: %iuv\n",299 volt->min_uv, volt->max_uv);300 301 if (nvbios_vmap_parse(bios, &ver, &hdr, &cnt, &len, &vmap)) {302 volt->max0_id = vmap.max0;303 volt->max1_id = vmap.max1;304 volt->max2_id = vmap.max2;305 } else {306 volt->max0_id = 0xff;307 volt->max1_id = 0xff;308 volt->max2_id = 0xff;309 }310 }311 312 if (volt->vid_nr) {313 for (i = 0; i < volt->vid_nr; i++) {314 nvkm_debug(&volt->subdev, "VID %02x: %duv\n",315 volt->vid[i].vid, volt->vid[i].uv);316 }317 }318}319 320int321nvkm_volt_new_(const struct nvkm_volt_func *func, struct nvkm_device *device,322 enum nvkm_subdev_type type, int inst, struct nvkm_volt **pvolt)323{324 if (!(*pvolt = kzalloc(sizeof(**pvolt), GFP_KERNEL)))325 return -ENOMEM;326 nvkm_volt_ctor(func, device, type, inst, *pvolt);327 return 0;328}329