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0001 /*
0002  * Copyright 2013 Red Hat Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Ben Skeggs
0023  */
0024 #include "priv.h"
0025 
0026 #include <subdev/bios.h>
0027 #include <subdev/bios/vmap.h>
0028 #include <subdev/bios/volt.h>
0029 #include <subdev/therm.h>
0030 
0031 int
0032 nvkm_volt_get(struct nvkm_volt *volt)
0033 {
0034     int ret, i;
0035 
0036     if (volt->func->volt_get)
0037         return volt->func->volt_get(volt);
0038 
0039     ret = volt->func->vid_get(volt);
0040     if (ret >= 0) {
0041         for (i = 0; i < volt->vid_nr; i++) {
0042             if (volt->vid[i].vid == ret)
0043                 return volt->vid[i].uv;
0044         }
0045         ret = -EINVAL;
0046     }
0047     return ret;
0048 }
0049 
0050 static int
0051 nvkm_volt_set(struct nvkm_volt *volt, u32 uv)
0052 {
0053     struct nvkm_subdev *subdev = &volt->subdev;
0054     int i, ret = -EINVAL, best_err = volt->max_uv, best = -1;
0055 
0056     if (volt->func->volt_set)
0057         return volt->func->volt_set(volt, uv);
0058 
0059     for (i = 0; i < volt->vid_nr; i++) {
0060         int err = volt->vid[i].uv - uv;
0061         if (err < 0 || err > best_err)
0062             continue;
0063 
0064         best_err = err;
0065         best = i;
0066         if (best_err == 0)
0067             break;
0068     }
0069 
0070     if (best == -1) {
0071         nvkm_error(subdev, "couldn't set %iuv\n", uv);
0072         return ret;
0073     }
0074 
0075     ret = volt->func->vid_set(volt, volt->vid[best].vid);
0076     nvkm_debug(subdev, "set req %duv to %duv: %d\n", uv,
0077            volt->vid[best].uv, ret);
0078     return ret;
0079 }
0080 
0081 int
0082 nvkm_volt_map_min(struct nvkm_volt *volt, u8 id)
0083 {
0084     struct nvkm_bios *bios = volt->subdev.device->bios;
0085     struct nvbios_vmap_entry info;
0086     u8  ver, len;
0087     u32 vmap;
0088 
0089     vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);
0090     if (vmap) {
0091         if (info.link != 0xff) {
0092             int ret = nvkm_volt_map_min(volt, info.link);
0093             if (ret < 0)
0094                 return ret;
0095             info.min += ret;
0096         }
0097         return info.min;
0098     }
0099 
0100     return id ? id * 10000 : -ENODEV;
0101 }
0102 
0103 int
0104 nvkm_volt_map(struct nvkm_volt *volt, u8 id, u8 temp)
0105 {
0106     struct nvkm_bios *bios = volt->subdev.device->bios;
0107     struct nvbios_vmap_entry info;
0108     u8  ver, len;
0109     u32 vmap;
0110 
0111     vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);
0112     if (vmap) {
0113         s64 result;
0114 
0115         if (volt->speedo < 0)
0116             return volt->speedo;
0117 
0118         if (ver == 0x10 || (ver == 0x20 && info.mode == 0)) {
0119             result  = div64_s64((s64)info.arg[0], 10);
0120             result += div64_s64((s64)info.arg[1] * volt->speedo, 10);
0121             result += div64_s64((s64)info.arg[2] * volt->speedo * volt->speedo, 100000);
0122         } else if (ver == 0x20) {
0123             switch (info.mode) {
0124             /* 0x0 handled above! */
0125             case 0x1:
0126                 result =  ((s64)info.arg[0] * 15625) >> 18;
0127                 result += ((s64)info.arg[1] * volt->speedo * 15625) >> 18;
0128                 result += ((s64)info.arg[2] * temp * 15625) >> 10;
0129                 result += ((s64)info.arg[3] * volt->speedo * temp * 15625) >> 18;
0130                 result += ((s64)info.arg[4] * volt->speedo * volt->speedo * 15625) >> 30;
0131                 result += ((s64)info.arg[5] * temp * temp * 15625) >> 18;
0132                 break;
0133             case 0x3:
0134                 result = (info.min + info.max) / 2;
0135                 break;
0136             case 0x2:
0137             default:
0138                 result = info.min;
0139                 break;
0140             }
0141         } else {
0142             return -ENODEV;
0143         }
0144 
0145         result = min(max(result, (s64)info.min), (s64)info.max);
0146 
0147         if (info.link != 0xff) {
0148             int ret = nvkm_volt_map(volt, info.link, temp);
0149             if (ret < 0)
0150                 return ret;
0151             result += ret;
0152         }
0153         return result;
0154     }
0155 
0156     return id ? id * 10000 : -ENODEV;
0157 }
0158 
0159 int
0160 nvkm_volt_set_id(struct nvkm_volt *volt, u8 id, u8 min_id, u8 temp,
0161          int condition)
0162 {
0163     int ret;
0164 
0165     if (volt->func->set_id)
0166         return volt->func->set_id(volt, id, condition);
0167 
0168     ret = nvkm_volt_map(volt, id, temp);
0169     if (ret >= 0) {
0170         int prev = nvkm_volt_get(volt);
0171         if (!condition || prev < 0 ||
0172             (condition < 0 && ret < prev) ||
0173             (condition > 0 && ret > prev)) {
0174             int min = nvkm_volt_map(volt, min_id, temp);
0175             if (min >= 0)
0176                 ret = max(min, ret);
0177             ret = nvkm_volt_set(volt, ret);
0178         } else {
0179             ret = 0;
0180         }
0181     }
0182     return ret;
0183 }
0184 
0185 static void
0186 nvkm_volt_parse_bios(struct nvkm_bios *bios, struct nvkm_volt *volt)
0187 {
0188     struct nvkm_subdev *subdev = &bios->subdev;
0189     struct nvbios_volt_entry ivid;
0190     struct nvbios_volt info;
0191     u8  ver, hdr, cnt, len;
0192     u32 data;
0193     int i;
0194 
0195     data = nvbios_volt_parse(bios, &ver, &hdr, &cnt, &len, &info);
0196     if (data && info.vidmask && info.base && info.step && info.ranged) {
0197         nvkm_debug(subdev, "found ranged based VIDs\n");
0198         volt->min_uv = info.min;
0199         volt->max_uv = info.max;
0200         for (i = 0; i < info.vidmask + 1; i++) {
0201             if (info.base >= info.min &&
0202                 info.base <= info.max) {
0203                 volt->vid[volt->vid_nr].uv = info.base;
0204                 volt->vid[volt->vid_nr].vid = i;
0205                 volt->vid_nr++;
0206             }
0207             info.base += info.step;
0208         }
0209         volt->vid_mask = info.vidmask;
0210     } else if (data && info.vidmask && !info.ranged) {
0211         nvkm_debug(subdev, "found entry based VIDs\n");
0212         volt->min_uv = 0xffffffff;
0213         volt->max_uv = 0;
0214         for (i = 0; i < cnt; i++) {
0215             data = nvbios_volt_entry_parse(bios, i, &ver, &hdr,
0216                                &ivid);
0217             if (data) {
0218                 volt->vid[volt->vid_nr].uv = ivid.voltage;
0219                 volt->vid[volt->vid_nr].vid = ivid.vid;
0220                 volt->vid_nr++;
0221                 volt->min_uv = min(volt->min_uv, ivid.voltage);
0222                 volt->max_uv = max(volt->max_uv, ivid.voltage);
0223             }
0224         }
0225         volt->vid_mask = info.vidmask;
0226     } else if (data && info.type == NVBIOS_VOLT_PWM) {
0227         volt->min_uv = info.base;
0228         volt->max_uv = info.base + info.pwm_range;
0229     }
0230 }
0231 
0232 static int
0233 nvkm_volt_speedo_read(struct nvkm_volt *volt)
0234 {
0235     if (volt->func->speedo_read)
0236         return volt->func->speedo_read(volt);
0237     return -EINVAL;
0238 }
0239 
0240 static int
0241 nvkm_volt_init(struct nvkm_subdev *subdev)
0242 {
0243     struct nvkm_volt *volt = nvkm_volt(subdev);
0244     int ret = nvkm_volt_get(volt);
0245     if (ret < 0) {
0246         if (ret != -ENODEV)
0247             nvkm_debug(subdev, "current voltage unknown\n");
0248         return 0;
0249     }
0250     nvkm_debug(subdev, "current voltage: %duv\n", ret);
0251     return 0;
0252 }
0253 
0254 static int
0255 nvkm_volt_oneinit(struct nvkm_subdev *subdev)
0256 {
0257     struct nvkm_volt *volt = nvkm_volt(subdev);
0258 
0259     volt->speedo = nvkm_volt_speedo_read(volt);
0260     if (volt->speedo > 0)
0261         nvkm_debug(&volt->subdev, "speedo %x\n", volt->speedo);
0262 
0263     if (volt->func->oneinit)
0264         return volt->func->oneinit(volt);
0265 
0266     return 0;
0267 }
0268 
0269 static void *
0270 nvkm_volt_dtor(struct nvkm_subdev *subdev)
0271 {
0272     return nvkm_volt(subdev);
0273 }
0274 
0275 static const struct nvkm_subdev_func
0276 nvkm_volt = {
0277     .dtor = nvkm_volt_dtor,
0278     .init = nvkm_volt_init,
0279     .oneinit = nvkm_volt_oneinit,
0280 };
0281 
0282 void
0283 nvkm_volt_ctor(const struct nvkm_volt_func *func, struct nvkm_device *device,
0284            enum nvkm_subdev_type type, int inst, struct nvkm_volt *volt)
0285 {
0286     struct nvkm_bios *bios = device->bios;
0287     int i;
0288 
0289     nvkm_subdev_ctor(&nvkm_volt, device, type, inst, &volt->subdev);
0290     volt->func = func;
0291 
0292     /* Assuming the non-bios device should build the voltage table later */
0293     if (bios) {
0294         u8 ver, hdr, cnt, len;
0295         struct nvbios_vmap vmap;
0296 
0297         nvkm_volt_parse_bios(bios, volt);
0298         nvkm_debug(&volt->subdev, "min: %iuv max: %iuv\n",
0299                volt->min_uv, volt->max_uv);
0300 
0301         if (nvbios_vmap_parse(bios, &ver, &hdr, &cnt, &len, &vmap)) {
0302             volt->max0_id = vmap.max0;
0303             volt->max1_id = vmap.max1;
0304             volt->max2_id = vmap.max2;
0305         } else {
0306             volt->max0_id = 0xff;
0307             volt->max1_id = 0xff;
0308             volt->max2_id = 0xff;
0309         }
0310     }
0311 
0312     if (volt->vid_nr) {
0313         for (i = 0; i < volt->vid_nr; i++) {
0314             nvkm_debug(&volt->subdev, "VID %02x: %duv\n",
0315                    volt->vid[i].vid, volt->vid[i].uv);
0316         }
0317     }
0318 }
0319 
0320 int
0321 nvkm_volt_new_(const struct nvkm_volt_func *func, struct nvkm_device *device,
0322            enum nvkm_subdev_type type, int inst, struct nvkm_volt **pvolt)
0323 {
0324     if (!(*pvolt = kzalloc(sizeof(**pvolt), GFP_KERNEL)))
0325         return -ENOMEM;
0326     nvkm_volt_ctor(func, device, type, inst, *pvolt);
0327     return 0;
0328 }
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