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
nvkm_volt_get(struct nvkm_volt * volt)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
nvkm_volt_set(struct nvkm_volt * volt,u32 uv)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
nvkm_volt_map(struct nvkm_volt * volt,u8 id)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
nvkm_volt_set_id(struct nvkm_volt * volt,u8 id,int condition)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
nvkm_volt_parse_bios(struct nvkm_bios * bios,struct nvkm_volt * volt)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
_nvkm_volt_init(struct nvkm_object * object)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
_nvkm_volt_dtor(struct nvkm_object * object)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
nvkm_volt_create_(struct nvkm_object * parent,struct nvkm_object * engine,struct nvkm_oclass * oclass,int length,void ** pobject)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