2 * Copyright 2013 Red Hat Inc.
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5 * copy of this software and associated documentation files (the "Software"),
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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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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
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20 * OTHER DEALINGS IN THE SOFTWARE.
25 #include <subdev/volt.h>
27 #include <subdev/bios.h>
28 #include <subdev/bios/vmap.h>
29 #include <subdev/bios/volt.h>
32 nouveau_volt_get(struct nouveau_volt *volt)
35 int ret = volt->vid_get(volt), i;
37 for (i = 0; i < volt->vid_nr; i++) {
38 if (volt->vid[i].vid == ret)
39 return volt->vid[i].uv;
49 nouveau_volt_set(struct nouveau_volt *volt, u32 uv)
53 for (i = 0; i < volt->vid_nr; i++) {
54 if (volt->vid[i].uv == uv) {
55 ret = volt->vid_set(volt, volt->vid[i].vid);
56 nv_debug(volt, "set %duv: %d\n", uv, ret);
66 nouveau_volt_map(struct nouveau_volt *volt, u8 id)
68 struct nouveau_bios *bios = nouveau_bios(volt);
69 struct nvbios_vmap_entry info;
73 vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);
75 if (info.link != 0xff) {
76 int ret = nouveau_volt_map(volt, info.link);
84 return id ? id * 10000 : -ENODEV;
88 nouveau_volt_set_id(struct nouveau_volt *volt, u8 id, int condition)
90 int ret = nouveau_volt_map(volt, id);
92 int prev = nouveau_volt_get(volt);
93 if (!condition || prev < 0 ||
94 (condition < 0 && ret < prev) ||
95 (condition > 0 && ret > prev)) {
96 ret = nouveau_volt_set(volt, ret);
105 _nouveau_volt_init(struct nouveau_object *object)
107 struct nouveau_volt *volt = (void *)object;
110 ret = nouveau_subdev_init(&volt->base);
114 ret = volt->get(volt);
117 nv_debug(volt, "current voltage unknown\n");
121 nv_info(volt, "GPU voltage: %duv\n", ret);
126 _nouveau_volt_dtor(struct nouveau_object *object)
128 struct nouveau_volt *volt = (void *)object;
129 nouveau_subdev_destroy(&volt->base);
133 nouveau_volt_create_(struct nouveau_object *parent,
134 struct nouveau_object *engine,
135 struct nouveau_oclass *oclass, int length, void **pobject)
137 struct nouveau_bios *bios = nouveau_bios(parent);
138 struct nouveau_volt *volt;
139 struct nvbios_volt_entry ivid;
140 struct nvbios_volt info;
141 u8 ver, hdr, cnt, len;
145 ret = nouveau_subdev_create_(parent, engine, oclass, 0, "VOLT",
146 "voltage", length, pobject);
151 volt->get = nouveau_volt_get;
152 volt->set = nouveau_volt_set;
153 volt->set_id = nouveau_volt_set_id;
155 data = nvbios_volt_parse(bios, &ver, &hdr, &cnt, &len, &info);
156 if (data && info.vidmask && info.base && info.step) {
157 for (i = 0; i < info.vidmask + 1; i++) {
158 if (info.base >= info.min &&
159 info.base <= info.max) {
160 volt->vid[volt->vid_nr].uv = info.base;
161 volt->vid[volt->vid_nr].vid = i;
164 info.base += info.step;
166 volt->vid_mask = info.vidmask;
168 if (data && info.vidmask) {
169 for (i = 0; i < cnt; i++) {
170 data = nvbios_volt_entry_parse(bios, i, &ver, &hdr,
173 volt->vid[volt->vid_nr].uv = ivid.voltage;
174 volt->vid[volt->vid_nr].vid = ivid.vid;
178 volt->vid_mask = info.vidmask;
182 for (i = 0; i < volt->vid_nr; i++) {
183 nv_debug(volt, "VID %02x: %duv\n",
184 volt->vid[i].vid, volt->vid[i].uv);
187 /*XXX: this is an assumption.. there probably exists boards
188 * out there with i2c-connected voltage controllers too..
190 ret = nouveau_voltgpio_init(volt);
192 volt->vid_get = nouveau_voltgpio_get;
193 volt->vid_set = nouveau_voltgpio_set;