1 /* ati_pcigart.h -- ATI PCI GART support -*- linux-c -*-
2 * Created: Wed Dec 13 21:52:19 2000 by gareth@valinux.com
3 */
4 /*-
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 *
27 * Authors:
28 * Gareth Hughes <gareth@valinux.com>
29 *
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/6.4/sys/dev/drm/ati_pcigart.c 153401 2005-12-14 00:52:59Z anholt $");
34
35 #include "dev/drm/drmP.h"
36
37 #define ATI_PCIGART_PAGE_SIZE 4096 /* PCI GART page size */
38 #define ATI_MAX_PCIGART_PAGES 8192 /* 32 MB aperture, 4K pages */
39 #define ATI_PCIGART_TABLE_SIZE 32768
40
41 int drm_ati_pcigart_init(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
42 {
43 unsigned long pages;
44 u32 *pci_gart = NULL, page_base;
45 int i, j;
46
47 if (dev->sg == NULL) {
48 DRM_ERROR( "no scatter/gather memory!\n" );
49 return 0;
50 }
51
52 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
53 /* GART table in system memory */
54 dev->sg->dmah = drm_pci_alloc(dev, ATI_PCIGART_TABLE_SIZE, 0,
55 0xfffffffful);
56 if (dev->sg->dmah == NULL) {
57 DRM_ERROR("cannot allocate PCI GART table!\n");
58 return 0;
59 }
60
61 gart_info->addr = (void *)dev->sg->dmah->vaddr;
62 gart_info->bus_addr = dev->sg->dmah->busaddr;
63 pci_gart = (u32 *)dev->sg->dmah->vaddr;
64 } else {
65 /* GART table in framebuffer memory */
66 pci_gart = gart_info->addr;
67 }
68
69 pages = DRM_MIN(dev->sg->pages, ATI_MAX_PCIGART_PAGES);
70
71 bzero(pci_gart, ATI_PCIGART_TABLE_SIZE);
72
73 KASSERT(PAGE_SIZE >= ATI_PCIGART_PAGE_SIZE, ("page size too small"));
74
75 for ( i = 0 ; i < pages ; i++ ) {
76 page_base = (u32) dev->sg->busaddr[i];
77
78 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
79 if (gart_info->is_pcie)
80 *pci_gart = (cpu_to_le32(page_base) >> 8) | 0xc;
81 else
82 *pci_gart = cpu_to_le32(page_base);
83 pci_gart++;
84 page_base += ATI_PCIGART_PAGE_SIZE;
85 }
86 }
87
88 DRM_MEMORYBARRIER();
89
90 return 1;
91 }
92
93 int drm_ati_pcigart_cleanup(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
94 {
95 if (dev->sg == NULL) {
96 DRM_ERROR( "no scatter/gather memory!\n" );
97 return 0;
98 }
99
100 drm_pci_free(dev, dev->sg->dmah);
101
102 return 1;
103 }
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