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_fbc.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 
35 static void i915_save_display(struct drm_i915_private *dev_priv)
36 {
37 	struct pci_dev *pdev = dev_priv->drm.pdev;
38 
39 	/* Display arbitration control */
40 	if (INTEL_GEN(dev_priv) <= 4)
41 		dev_priv->regfile.saveDSPARB = I915_READ(DSPARB);
42 
43 	if (IS_GEN(dev_priv, 4))
44 		pci_read_config_word(pdev, GCDGMBUS,
45 				     &dev_priv->regfile.saveGCDGMBUS);
46 }
47 
48 static void i915_restore_display(struct drm_i915_private *dev_priv)
49 {
50 	struct pci_dev *pdev = dev_priv->drm.pdev;
51 
52 	if (IS_GEN(dev_priv, 4))
53 		pci_write_config_word(pdev, GCDGMBUS,
54 				      dev_priv->regfile.saveGCDGMBUS);
55 
56 	/* Display arbitration */
57 	if (INTEL_GEN(dev_priv) <= 4)
58 		I915_WRITE(DSPARB, dev_priv->regfile.saveDSPARB);
59 
60 	/* only restore FBC info on the platform that supports FBC*/
61 	intel_fbc_global_disable(dev_priv);
62 
63 	intel_vga_redisable(dev_priv);
64 
65 	intel_gmbus_reset(dev_priv);
66 }
67 
68 int i915_save_state(struct drm_i915_private *dev_priv)
69 {
70 	int i;
71 
72 	i915_save_display(dev_priv);
73 
74 	/* Scratch space */
75 	if (IS_GEN(dev_priv, 2) && IS_MOBILE(dev_priv)) {
76 		for (i = 0; i < 7; i++) {
77 			dev_priv->regfile.saveSWF0[i] = I915_READ(SWF0(i));
78 			dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
79 		}
80 		for (i = 0; i < 3; i++)
81 			dev_priv->regfile.saveSWF3[i] = I915_READ(SWF3(i));
82 	} else if (IS_GEN(dev_priv, 2)) {
83 		for (i = 0; i < 7; i++)
84 			dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
85 	} else if (HAS_GMCH(dev_priv)) {
86 		for (i = 0; i < 16; i++) {
87 			dev_priv->regfile.saveSWF0[i] = I915_READ(SWF0(i));
88 			dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
89 		}
90 		for (i = 0; i < 3; i++)
91 			dev_priv->regfile.saveSWF3[i] = I915_READ(SWF3(i));
92 	}
93 
94 	return 0;
95 }
96 
97 int i915_restore_state(struct drm_i915_private *dev_priv)
98 {
99 	int i;
100 
101 	i915_restore_display(dev_priv);
102 
103 	/* Scratch space */
104 	if (IS_GEN(dev_priv, 2) && IS_MOBILE(dev_priv)) {
105 		for (i = 0; i < 7; i++) {
106 			I915_WRITE(SWF0(i), dev_priv->regfile.saveSWF0[i]);
107 			I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
108 		}
109 		for (i = 0; i < 3; i++)
110 			I915_WRITE(SWF3(i), dev_priv->regfile.saveSWF3[i]);
111 	} else if (IS_GEN(dev_priv, 2)) {
112 		for (i = 0; i < 7; i++)
113 			I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
114 	} else if (HAS_GMCH(dev_priv)) {
115 		for (i = 0; i < 16; i++) {
116 			I915_WRITE(SWF0(i), dev_priv->regfile.saveSWF0[i]);
117 			I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
118 		}
119 		for (i = 0; i < 3; i++)
120 			I915_WRITE(SWF3(i), dev_priv->regfile.saveSWF3[i]);
121 	}
122 
123 	return 0;
124 }
125