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
25#include <subdev/volt.h>
26
27#include <subdev/bios.h>
28#include <subdev/bios/vmap.h>
29#include <subdev/bios/volt.h>
30
31static int
32nouveau_volt_get(struct nouveau_volt *volt)
33{
34	if (volt->vid_get) {
35		int ret = volt->vid_get(volt), i;
36		if (ret >= 0) {
37			for (i = 0; i < volt->vid_nr; i++) {
38				if (volt->vid[i].vid == ret)
39					return volt->vid[i].uv;
40			}
41			ret = -EINVAL;
42		}
43		return ret;
44	}
45	return -ENODEV;
46}
47
48static int
49nouveau_volt_set(struct nouveau_volt *volt, u32 uv)
50{
51	if (volt->vid_set) {
52		int i, ret = -EINVAL;
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);
57				break;
58			}
59		}
60		return ret;
61	}
62	return -ENODEV;
63}
64
65static int
66nouveau_volt_map(struct nouveau_volt *volt, u8 id)
67{
68	struct nouveau_bios *bios = nouveau_bios(volt);
69	struct nvbios_vmap_entry info;
70	u8  ver, len;
71	u16 vmap;
72
73	vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);
74	if (vmap) {
75		if (info.link != 0xff) {
76			int ret = nouveau_volt_map(volt, info.link);
77			if (ret < 0)
78				return ret;
79			info.min += ret;
80		}
81		return info.min;
82	}
83
84	return id ? id * 10000 : -ENODEV;
85}
86
87static int
88nouveau_volt_set_id(struct nouveau_volt *volt, u8 id, int condition)
89{
90	int ret = nouveau_volt_map(volt, id);
91	if (ret >= 0) {
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);
97		} else {
98			ret = 0;
99		}
100	}
101	return ret;
102}
103
104int
105_nouveau_volt_init(struct nouveau_object *object)
106{
107	struct nouveau_volt *volt = (void *)object;
108	int ret;
109
110	ret = nouveau_subdev_init(&volt->base);
111	if (ret)
112		return ret;
113
114	ret = volt->get(volt);
115	if (ret < 0) {
116		if (ret != -ENODEV)
117			nv_debug(volt, "current voltage unknown\n");
118		return 0;
119	}
120
121	nv_info(volt, "GPU voltage: %duv\n", ret);
122	return 0;
123}
124
125void
126_nouveau_volt_dtor(struct nouveau_object *object)
127{
128	struct nouveau_volt *volt = (void *)object;
129	nouveau_subdev_destroy(&volt->base);
130}
131
132int
133nouveau_volt_create_(struct nouveau_object *parent,
134		     struct nouveau_object *engine,
135		     struct nouveau_oclass *oclass, int length, void **pobject)
136{
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;
142	u16 data;
143	int ret, i;
144
145	ret = nouveau_subdev_create_(parent, engine, oclass, 0, "VOLT",
146				     "voltage", length, pobject);
147	volt = *pobject;
148	if (ret)
149		return ret;
150
151	volt->get = nouveau_volt_get;
152	volt->set = nouveau_volt_set;
153	volt->set_id = nouveau_volt_set_id;
154
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;
162				volt->vid_nr++;
163			}
164			info.base += info.step;
165		}
166		volt->vid_mask = info.vidmask;
167	} else
168	if (data && info.vidmask) {
169		for (i = 0; i < cnt; i++) {
170			data = nvbios_volt_entry_parse(bios, i, &ver, &hdr,
171						      &ivid);
172			if (data) {
173				volt->vid[volt->vid_nr].uv = ivid.voltage;
174				volt->vid[volt->vid_nr].vid = ivid.vid;
175				volt->vid_nr++;
176			}
177		}
178		volt->vid_mask = info.vidmask;
179	}
180
181	if (volt->vid_nr) {
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);
185		}
186
187		/*XXX: this is an assumption.. there probably exists boards
188		 * out there with i2c-connected voltage controllers too..
189		 */
190		ret = nouveau_voltgpio_init(volt);
191		if (ret == 0) {
192			volt->vid_get = nouveau_voltgpio_get;
193			volt->vid_set = nouveau_voltgpio_set;
194		}
195	}
196
197	return ret;
198}
199