summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/nouveau/nouveau_volt.c
blob: c2cc8e2d653925c2a34fb6044d5b15f81a1996c0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
/*
 * Copyright 2010 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#include "drmP.h"

#include "nouveau_drm.h"
#include "nouveau_pm.h"

#include <subdev/bios/gpio.h>
#include <subdev/gpio.h>

static const enum dcb_gpio_func_name vidtag[] = { 0x04, 0x05, 0x06, 0x1a, 0x73 };
static int nr_vidtag = sizeof(vidtag) / sizeof(vidtag[0]);

int
nouveau_voltage_gpio_get(struct drm_device *dev)
{
	struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
	struct nouveau_device *device = nouveau_dev(dev);
	struct nouveau_gpio *gpio = nouveau_gpio(device);
	u8 vid = 0;
	int i;

	for (i = 0; i < nr_vidtag; i++) {
		if (!(volt->vid_mask & (1 << i)))
			continue;

		vid |= gpio->get(gpio, 0, vidtag[i], 0xff) << i;
	}

	return nouveau_volt_lvl_lookup(dev, vid);
}

int
nouveau_voltage_gpio_set(struct drm_device *dev, int voltage)
{
	struct nouveau_device *device = nouveau_dev(dev);
	struct nouveau_gpio *gpio = nouveau_gpio(device);
	struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
	int vid, i;

	vid = nouveau_volt_vid_lookup(dev, voltage);
	if (vid < 0)
		return vid;

	for (i = 0; i < nr_vidtag; i++) {
		if (!(volt->vid_mask & (1 << i)))
			continue;

		gpio->set(gpio, 0, vidtag[i], 0xff, !!(vid & (1 << i)));
	}

	return 0;
}

int
nouveau_volt_vid_lookup(struct drm_device *dev, int voltage)
{
	struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
	int i;

	for (i = 0; i < volt->nr_level; i++) {
		if (volt->level[i].voltage == voltage)
			return volt->level[i].vid;
	}

	return -ENOENT;
}

int
nouveau_volt_lvl_lookup(struct drm_device *dev, int vid)
{
	struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
	int i;

	for (i = 0; i < volt->nr_level; i++) {
		if (volt->level[i].vid == vid)
			return volt->level[i].voltage;
	}

	return -ENOENT;
}

void
nouveau_volt_init(struct drm_device *dev)
{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nouveau_gpio *gpio = nouveau_gpio(drm->device);
	struct nouveau_pm *pm = nouveau_pm(dev);
	struct nouveau_pm_voltage *voltage = &pm->voltage;
	struct nvbios *bios = &drm->vbios;
	struct dcb_gpio_func func;
	struct bit_entry P;
	u8 *volt = NULL, *entry;
	int i, headerlen, recordlen, entries, vidmask, vidshift;

	if (bios->type == NVBIOS_BIT) {
		if (bit_table(dev, 'P', &P))
			return;

		if (P.version == 1)
			volt = ROMPTR(dev, P.data[16]);
		else
		if (P.version == 2)
			volt = ROMPTR(dev, P.data[12]);
		else {
			NV_WARN(drm, "unknown volt for BIT P %d\n", P.version);
		}
	} else {
		if (bios->data[bios->offset + 6] < 0x27) {
			NV_DEBUG(drm, "BMP version too old for voltage\n");
			return;
		}

		volt = ROMPTR(dev, bios->data[bios->offset + 0x98]);
	}

	if (!volt) {
		NV_DEBUG(drm, "voltage table pointer invalid\n");
		return;
	}

	switch (volt[0]) {
	case 0x10:
	case 0x11:
	case 0x12:
		headerlen = 5;
		recordlen = volt[1];
		entries   = volt[2];
		vidshift  = 0;
		vidmask   = volt[4];
		break;
	case 0x20:
		headerlen = volt[1];
		recordlen = volt[3];
		entries   = volt[2];
		vidshift  = 0; /* could be vidshift like 0x30? */
		vidmask   = volt[5];
		break;
	case 0x30:
		headerlen = volt[1];
		recordlen = volt[2];
		entries   = volt[3];
		vidmask   = volt[4];
		/* no longer certain what volt[5] is, if it's related to
		 * the vid shift then it's definitely not a function of
		 * how many bits are set.
		 *
		 * after looking at a number of nva3+ vbios images, they
		 * all seem likely to have a static shift of 2.. lets
		 * go with that for now until proven otherwise.
		 */
		vidshift  = 2;
		break;
	case 0x40:
		headerlen = volt[1];
		recordlen = volt[2];
		entries   = volt[3]; /* not a clue what the entries are for.. */
		vidmask   = volt[11]; /* guess.. */
		vidshift  = 0;
		break;
	default:
		NV_WARN(drm, "voltage table 0x%02x unknown\n", volt[0]);
		return;
	}

	/* validate vid mask */
	voltage->vid_mask = vidmask;
	if (!voltage->vid_mask)
		return;

	i = 0;
	while (vidmask) {
		if (i > nr_vidtag) {
			NV_DEBUG(drm, "vid bit %d unknown\n", i);
			return;
		}

		if (gpio && gpio->find(gpio, 0, vidtag[i], 0xff, &func)) {
			NV_DEBUG(drm, "vid bit %d has no gpio tag\n", i);
			return;
		}

		vidmask >>= 1;
		i++;
	}

	/* parse vbios entries into common format */
	voltage->version = volt[0];
	if (voltage->version < 0x40) {
		voltage->nr_level = entries;
		voltage->level =
			kcalloc(entries, sizeof(*voltage->level), GFP_KERNEL);
		if (!voltage->level)
			return;

		entry = volt + headerlen;
		for (i = 0; i < entries; i++, entry += recordlen) {
			voltage->level[i].voltage = entry[0] * 10000;
			voltage->level[i].vid     = entry[1] >> vidshift;
		}
	} else {
		u32 volt_uv = ROM32(volt[4]);
		s16 step_uv = ROM16(volt[8]);
		u8 vid;

		voltage->nr_level = voltage->vid_mask + 1;
		voltage->level = kcalloc(voltage->nr_level,
					 sizeof(*voltage->level), GFP_KERNEL);
		if (!voltage->level)
			return;

		for (vid = 0; vid <= voltage->vid_mask; vid++) {
			voltage->level[vid].voltage = volt_uv;
			voltage->level[vid].vid = vid;
			volt_uv += step_uv;
		}
	}

	voltage->supported = true;
}

void
nouveau_volt_fini(struct drm_device *dev)
{
	struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;

	kfree(volt->level);
}
OpenPOWER on IntegriCloud