1 /*
2 * Copyright 2010 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 <drm/drmP.h>
26
27 #include "nouveau_drm.h"
28 #include "nouveau_pm.h"
29
30 #include <subdev/bios/gpio.h>
31 #include <subdev/gpio.h>
32
33 static const enum dcb_gpio_func_name vidtag[] = { 0x04, 0x05, 0x06, 0x1a, 0x73 };
34 static int nr_vidtag = sizeof(vidtag) / sizeof(vidtag[0]);
35
36 int
nouveau_voltage_gpio_get(struct drm_device * dev)37 nouveau_voltage_gpio_get(struct drm_device *dev)
38 {
39 struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
40 struct nouveau_device *device = nouveau_dev(dev);
41 struct nouveau_gpio *gpio = nouveau_gpio(device);
42 u8 vid = 0;
43 int i;
44
45 for (i = 0; i < nr_vidtag; i++) {
46 if (!(volt->vid_mask & (1 << i)))
47 continue;
48
49 vid |= gpio->get(gpio, 0, vidtag[i], 0xff) << i;
50 }
51
52 return nouveau_volt_lvl_lookup(dev, vid);
53 }
54
55 int
nouveau_voltage_gpio_set(struct drm_device * dev,int voltage)56 nouveau_voltage_gpio_set(struct drm_device *dev, int voltage)
57 {
58 struct nouveau_device *device = nouveau_dev(dev);
59 struct nouveau_gpio *gpio = nouveau_gpio(device);
60 struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
61 int vid, i;
62
63 vid = nouveau_volt_vid_lookup(dev, voltage);
64 if (vid < 0)
65 return vid;
66
67 for (i = 0; i < nr_vidtag; i++) {
68 if (!(volt->vid_mask & (1 << i)))
69 continue;
70
71 gpio->set(gpio, 0, vidtag[i], 0xff, !!(vid & (1 << i)));
72 }
73
74 return 0;
75 }
76
77 int
nouveau_volt_vid_lookup(struct drm_device * dev,int voltage)78 nouveau_volt_vid_lookup(struct drm_device *dev, int voltage)
79 {
80 struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
81 int i;
82
83 for (i = 0; i < volt->nr_level; i++) {
84 if (volt->level[i].voltage == voltage)
85 return volt->level[i].vid;
86 }
87
88 return -ENOENT;
89 }
90
91 int
nouveau_volt_lvl_lookup(struct drm_device * dev,int vid)92 nouveau_volt_lvl_lookup(struct drm_device *dev, int vid)
93 {
94 struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
95 int i;
96
97 for (i = 0; i < volt->nr_level; i++) {
98 if (volt->level[i].vid == vid)
99 return volt->level[i].voltage;
100 }
101
102 return -ENOENT;
103 }
104
105 void
nouveau_volt_init(struct drm_device * dev)106 nouveau_volt_init(struct drm_device *dev)
107 {
108 struct nouveau_drm *drm = nouveau_drm(dev);
109 struct nouveau_gpio *gpio = nouveau_gpio(drm->device);
110 struct nouveau_pm *pm = nouveau_pm(dev);
111 struct nouveau_pm_voltage *voltage = &pm->voltage;
112 struct nvbios *bios = &drm->vbios;
113 struct dcb_gpio_func func;
114 struct bit_entry P;
115 u8 *volt = NULL, *entry;
116 int i, headerlen, recordlen, entries, vidmask, vidshift;
117
118 if (bios->type == NVBIOS_BIT) {
119 if (bit_table(dev, 'P', &P))
120 return;
121
122 if (P.version == 1)
123 volt = ROMPTR(dev, P.data[16]);
124 else
125 if (P.version == 2)
126 volt = ROMPTR(dev, P.data[12]);
127 else {
128 NV_WARN(drm, "unknown volt for BIT P %d\n", P.version);
129 }
130 } else {
131 if (bios->data[bios->offset + 6] < 0x27) {
132 NV_DEBUG(drm, "BMP version too old for voltage\n");
133 return;
134 }
135
136 volt = ROMPTR(dev, bios->data[bios->offset + 0x98]);
137 }
138
139 if (!volt) {
140 NV_DEBUG(drm, "voltage table pointer invalid\n");
141 return;
142 }
143
144 switch (volt[0]) {
145 case 0x10:
146 case 0x11:
147 case 0x12:
148 headerlen = 5;
149 recordlen = volt[1];
150 entries = volt[2];
151 vidshift = 0;
152 vidmask = volt[4];
153 break;
154 case 0x20:
155 headerlen = volt[1];
156 recordlen = volt[3];
157 entries = volt[2];
158 vidshift = 0; /* could be vidshift like 0x30? */
159 vidmask = volt[5];
160 break;
161 case 0x30:
162 headerlen = volt[1];
163 recordlen = volt[2];
164 entries = volt[3];
165 vidmask = volt[4];
166 /* no longer certain what volt[5] is, if it's related to
167 * the vid shift then it's definitely not a function of
168 * how many bits are set.
169 *
170 * after looking at a number of nva3+ vbios images, they
171 * all seem likely to have a static shift of 2.. lets
172 * go with that for now until proven otherwise.
173 */
174 vidshift = 2;
175 break;
176 case 0x40:
177 headerlen = volt[1];
178 recordlen = volt[2];
179 entries = volt[3]; /* not a clue what the entries are for.. */
180 vidmask = volt[11]; /* guess.. */
181 vidshift = 0;
182 break;
183 default:
184 NV_WARN(drm, "voltage table 0x%02x unknown\n", volt[0]);
185 return;
186 }
187
188 /* validate vid mask */
189 voltage->vid_mask = vidmask;
190 if (!voltage->vid_mask)
191 return;
192
193 i = 0;
194 while (vidmask) {
195 if (i > nr_vidtag) {
196 NV_DEBUG(drm, "vid bit %d unknown\n", i);
197 return;
198 }
199
200 if (gpio && gpio->find(gpio, 0, vidtag[i], 0xff, &func)) {
201 NV_DEBUG(drm, "vid bit %d has no gpio tag\n", i);
202 return;
203 }
204
205 vidmask >>= 1;
206 i++;
207 }
208
209 /* parse vbios entries into common format */
210 voltage->version = volt[0];
211 if (voltage->version < 0x40) {
212 voltage->nr_level = entries;
213 voltage->level =
214 kcalloc(entries, sizeof(*voltage->level), GFP_KERNEL);
215 if (!voltage->level)
216 return;
217
218 entry = volt + headerlen;
219 for (i = 0; i < entries; i++, entry += recordlen) {
220 voltage->level[i].voltage = entry[0] * 10000;
221 voltage->level[i].vid = entry[1] >> vidshift;
222 }
223 } else {
224 u32 volt_uv = ROM32(volt[4]);
225 s16 step_uv = ROM16(volt[8]);
226 u8 vid;
227
228 voltage->nr_level = voltage->vid_mask + 1;
229 voltage->level = kcalloc(voltage->nr_level,
230 sizeof(*voltage->level), GFP_KERNEL);
231 if (!voltage->level)
232 return;
233
234 for (vid = 0; vid <= voltage->vid_mask; vid++) {
235 voltage->level[vid].voltage = volt_uv;
236 voltage->level[vid].vid = vid;
237 volt_uv += step_uv;
238 }
239 }
240
241 voltage->supported = true;
242 }
243
244 void
nouveau_volt_fini(struct drm_device * dev)245 nouveau_volt_fini(struct drm_device *dev)
246 {
247 struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
248
249 kfree(volt->level);
250 }
251