1 /* $OpenBSD: drm_agpsupport.c,v 1.29 2022/01/14 06:52:58 jsg Exp $ */
2 /*-
3 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
4 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the next
15 * paragraph) shall be included in all copies or substantial portions of the
16 * Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
25 *
26 * Author:
27 * Rickard E. (Rik) Faith <faith@valinux.com>
28 * Gareth Hughes <gareth@valinux.com>
29 *
30 */
31
32 /*
33 * Support code for tying the kernel AGP support to DRM drivers.
34 */
35
36 #include <linux/module.h>
37 #include <linux/pci.h>
38 #include <linux/slab.h>
39
40 #include <asm/agp.h>
41
42 #include <drm/drm_device.h>
43 #include <drm/drm_drv.h>
44 #include <drm/drm_file.h>
45 #include <drm/drm_print.h>
46
47 #include "drm_legacy.h"
48
49 #if IS_ENABLED(CONFIG_AGP)
50
51 int
drm_legacy_agp_info(struct drm_device * dev,struct drm_agp_info * info)52 drm_legacy_agp_info(struct drm_device * dev, struct drm_agp_info *info)
53 {
54 struct agp_info *kern;
55
56 if (dev->agp == NULL || !dev->agp->acquired)
57 return (EINVAL);
58
59 kern = &dev->agp->info;
60 agp_get_info(dev->agp->agpdev, kern);
61 info->agp_version_major = 1;
62 info->agp_version_minor = 0;
63 info->mode = kern->ai_mode;
64 info->aperture_base = kern->ai_aperture_base;
65 info->aperture_size = kern->ai_aperture_size;
66 info->memory_allowed = kern->ai_memory_allowed;
67 info->memory_used = kern->ai_memory_used;
68 info->id_vendor = kern->ai_devid & 0xffff;
69 info->id_device = kern->ai_devid >> 16;
70
71 return (0);
72 }
73
74 int
drm_legacy_agp_acquire(struct drm_device * dev)75 drm_legacy_agp_acquire(struct drm_device *dev)
76 {
77 int retcode;
78
79 if (dev->agp == NULL || dev->agp->acquired)
80 return (EINVAL);
81
82 retcode = agp_acquire(dev->agp->agpdev);
83 if (retcode)
84 return (retcode);
85
86 dev->agp->acquired = 1;
87
88 return (0);
89 }
90
91 int
drm_legacy_agp_release(struct drm_device * dev)92 drm_legacy_agp_release(struct drm_device * dev)
93 {
94 if (dev->agp == NULL || !dev->agp->acquired)
95 return (EINVAL);
96 agp_release(dev->agp->agpdev);
97 dev->agp->acquired = 0;
98
99 return (0);
100 }
101
102 int
drm_legacy_agp_enable(struct drm_device * dev,drm_agp_mode_t mode)103 drm_legacy_agp_enable(struct drm_device *dev, drm_agp_mode_t mode)
104 {
105 int retcode = 0;
106
107 if (dev->agp == NULL || !dev->agp->acquired)
108 return (EINVAL);
109
110 dev->agp->mode = mode.mode;
111 if ((retcode = agp_enable(dev->agp->agpdev, mode.mode)) == 0)
112 dev->agp->enabled = 1;
113 return (retcode);
114 }
115
116 void
drm_legacy_agp_takedown(struct drm_device * dev)117 drm_legacy_agp_takedown(struct drm_device *dev)
118 {
119 if (dev->agp == NULL)
120 return;
121
122 drm_legacy_agp_release(dev);
123 dev->agp->enabled = 0;
124 }
125
126 struct drm_agp_head *
drm_legacy_agp_init(struct drm_device * dev)127 drm_legacy_agp_init(struct drm_device *dev)
128 {
129 struct agp_softc *agpdev;
130 struct drm_agp_head *head = NULL;
131 int agp_available = 1;
132
133 agpdev = agp_find_device(0);
134 if (agpdev == NULL)
135 agp_available = 0;
136
137 DRM_DEBUG("agp_available = %d\n", agp_available);
138
139 if (agp_available) {
140 head = mallocarray(1, sizeof(*head), M_DRM, M_NOWAIT | M_ZERO);
141 if (head == NULL)
142 return (NULL);
143 head->agpdev = agpdev;
144 agp_get_info(agpdev, &head->info);
145 head->base = head->info.ai_aperture_base;
146 head->cant_use_aperture = (head->base == 0);
147 TAILQ_INIT(&head->memory);
148 }
149 return (head);
150 }
151
152 #endif /* IS_ENABLED(CONFIG_AGP) */
153