1/*
2 *
3 * Copyright 2008 (c) Intel Corporation
4 *   Jesse Barnes <jbarnes@virtuousgeek.org>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26
27#include "display/intel_de.h"
28#include "display/intel_gmbus.h"
29#include "display/intel_vga.h"
30
31#include "i915_drv.h"
32#include "i915_reg.h"
33#include "i915_suspend.h"
34#include "intel_pci_config.h"
35
36static void intel_save_swf(struct drm_i915_private *dev_priv)
37{
38	int i;
39
40	/* Scratch space */
41	if (GRAPHICS_VER(dev_priv) == 2 && IS_MOBILE(dev_priv)) {
42		for (i = 0; i < 7; i++) {
43			dev_priv->regfile.saveSWF0[i] = intel_de_read(dev_priv, SWF0(i));
44			dev_priv->regfile.saveSWF1[i] = intel_de_read(dev_priv, SWF1(i));
45		}
46		for (i = 0; i < 3; i++)
47			dev_priv->regfile.saveSWF3[i] = intel_de_read(dev_priv, SWF3(i));
48	} else if (GRAPHICS_VER(dev_priv) == 2) {
49		for (i = 0; i < 7; i++)
50			dev_priv->regfile.saveSWF1[i] = intel_de_read(dev_priv, SWF1(i));
51	} else if (HAS_GMCH(dev_priv)) {
52		for (i = 0; i < 16; i++) {
53			dev_priv->regfile.saveSWF0[i] = intel_de_read(dev_priv, SWF0(i));
54			dev_priv->regfile.saveSWF1[i] = intel_de_read(dev_priv, SWF1(i));
55		}
56		for (i = 0; i < 3; i++)
57			dev_priv->regfile.saveSWF3[i] = intel_de_read(dev_priv, SWF3(i));
58	}
59}
60
61static void intel_restore_swf(struct drm_i915_private *dev_priv)
62{
63	int i;
64
65	/* Scratch space */
66	if (GRAPHICS_VER(dev_priv) == 2 && IS_MOBILE(dev_priv)) {
67		for (i = 0; i < 7; i++) {
68			intel_de_write(dev_priv, SWF0(i), dev_priv->regfile.saveSWF0[i]);
69			intel_de_write(dev_priv, SWF1(i), dev_priv->regfile.saveSWF1[i]);
70		}
71		for (i = 0; i < 3; i++)
72			intel_de_write(dev_priv, SWF3(i), dev_priv->regfile.saveSWF3[i]);
73	} else if (GRAPHICS_VER(dev_priv) == 2) {
74		for (i = 0; i < 7; i++)
75			intel_de_write(dev_priv, SWF1(i), dev_priv->regfile.saveSWF1[i]);
76	} else if (HAS_GMCH(dev_priv)) {
77		for (i = 0; i < 16; i++) {
78			intel_de_write(dev_priv, SWF0(i), dev_priv->regfile.saveSWF0[i]);
79			intel_de_write(dev_priv, SWF1(i), dev_priv->regfile.saveSWF1[i]);
80		}
81		for (i = 0; i < 3; i++)
82			intel_de_write(dev_priv, SWF3(i), dev_priv->regfile.saveSWF3[i]);
83	}
84}
85
86void i915_save_display(struct drm_i915_private *dev_priv)
87{
88	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
89
90	if (!HAS_DISPLAY(dev_priv))
91		return;
92
93	/* Display arbitration control */
94	if (GRAPHICS_VER(dev_priv) <= 4)
95		dev_priv->regfile.saveDSPARB = intel_de_read(dev_priv, DSPARB);
96
97	if (GRAPHICS_VER(dev_priv) == 4)
98		pci_read_config_word(pdev, GCDGMBUS,
99				     &dev_priv->regfile.saveGCDGMBUS);
100
101	intel_save_swf(dev_priv);
102}
103
104void i915_restore_display(struct drm_i915_private *dev_priv)
105{
106	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
107
108	if (!HAS_DISPLAY(dev_priv))
109		return;
110
111	intel_restore_swf(dev_priv);
112
113	if (GRAPHICS_VER(dev_priv) == 4)
114		pci_write_config_word(pdev, GCDGMBUS,
115				      dev_priv->regfile.saveGCDGMBUS);
116
117	/* Display arbitration */
118	if (GRAPHICS_VER(dev_priv) <= 4)
119		intel_de_write(dev_priv, DSPARB, dev_priv->regfile.saveDSPARB);
120
121	intel_vga_redisable(dev_priv);
122
123	intel_gmbus_reset(dev_priv);
124}
125