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 #include <subdev/therm.h>
30
31 int
nvkm_volt_get(struct nvkm_volt * volt)32 nvkm_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
50 static int
nvkm_volt_set(struct nvkm_volt * volt,u32 uv)51 nvkm_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
81 int
nvkm_volt_map_min(struct nvkm_volt * volt,u8 id)82 nvkm_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
103 int
nvkm_volt_map(struct nvkm_volt * volt,u8 id,u8 temp)104 nvkm_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
159 int
nvkm_volt_set_id(struct nvkm_volt * volt,u8 id,u8 min_id,u8 temp,int condition)160 nvkm_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
185 static void
nvkm_volt_parse_bios(struct nvkm_bios * bios,struct nvkm_volt * volt)186 nvkm_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
232 static int
nvkm_volt_speedo_read(struct nvkm_volt * volt)233 nvkm_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
240 static int
nvkm_volt_init(struct nvkm_subdev * subdev)241 nvkm_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
254 static int
nvkm_volt_oneinit(struct nvkm_subdev * subdev)255 nvkm_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
269 static void *
nvkm_volt_dtor(struct nvkm_subdev * subdev)270 nvkm_volt_dtor(struct nvkm_subdev *subdev)
271 {
272 return nvkm_volt(subdev);
273 }
274
275 static const struct nvkm_subdev_func
276 nvkm_volt = {
277 .dtor = nvkm_volt_dtor,
278 .init = nvkm_volt_init,
279 .oneinit = nvkm_volt_oneinit,
280 };
281
282 void
nvkm_volt_ctor(const struct nvkm_volt_func * func,struct nvkm_device * device,int index,struct nvkm_volt * volt)283 nvkm_volt_ctor(const struct nvkm_volt_func *func, struct nvkm_device *device,
284 int index, struct nvkm_volt *volt)
285 {
286 struct nvkm_bios *bios = device->bios;
287 int i;
288
289 nvkm_subdev_ctor(&nvkm_volt, device, index, &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
320 int
nvkm_volt_new_(const struct nvkm_volt_func * func,struct nvkm_device * device,int index,struct nvkm_volt ** pvolt)321 nvkm_volt_new_(const struct nvkm_volt_func *func, struct nvkm_device *device,
322 int index, struct nvkm_volt **pvolt)
323 {
324 if (!(*pvolt = kzalloc(sizeof(**pvolt), GFP_KERNEL)))
325 return -ENOMEM;
326 nvkm_volt_ctor(func, device, index, *pvolt);
327 return 0;
328 }
329