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 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 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 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 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 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 * 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