1 /**
2 * \file ati_pcigart.c
3 * ATI PCI GART support
4 *
5 * \author Gareth Hughes <gareth@valinux.com>
6 */
7
8 /*
9 * Created: Wed Dec 13 21:52:19 2000 by gareth@valinux.com
10 *
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
23 * Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
31 * DEALINGS IN THE SOFTWARE.
32 */
33
34 #include <linux/export.h>
35 #include "drmP.h"
36
37 # define ATI_PCIGART_PAGE_SIZE 4096 /**< PCI GART page size */
38
drm_ati_alloc_pcigart_table(struct drm_device * dev,struct drm_ati_pcigart_info * gart_info)39 static int drm_ati_alloc_pcigart_table(struct drm_device *dev,
40 struct drm_ati_pcigart_info *gart_info)
41 {
42 gart_info->table_handle = drm_pci_alloc(dev, gart_info->table_size,
43 PAGE_SIZE);
44 if (gart_info->table_handle == NULL)
45 return -ENOMEM;
46
47 return 0;
48 }
49
drm_ati_free_pcigart_table(struct drm_device * dev,struct drm_ati_pcigart_info * gart_info)50 static void drm_ati_free_pcigart_table(struct drm_device *dev,
51 struct drm_ati_pcigart_info *gart_info)
52 {
53 drm_pci_free(dev, gart_info->table_handle);
54 gart_info->table_handle = NULL;
55 }
56
drm_ati_pcigart_cleanup(struct drm_device * dev,struct drm_ati_pcigart_info * gart_info)57 int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
58 {
59 struct drm_sg_mem *entry = dev->sg;
60 unsigned long pages;
61 int i;
62 int max_pages;
63
64 /* we need to support large memory configurations */
65 if (!entry) {
66 DRM_ERROR("no scatter/gather memory!\n");
67 return 0;
68 }
69
70 if (gart_info->bus_addr) {
71
72 max_pages = (gart_info->table_size / sizeof(u32));
73 pages = (entry->pages <= max_pages)
74 ? entry->pages : max_pages;
75
76 for (i = 0; i < pages; i++) {
77 if (!entry->busaddr[i])
78 break;
79 pci_unmap_page(dev->pdev, entry->busaddr[i],
80 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
81 }
82
83 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
84 gart_info->bus_addr = 0;
85 }
86
87 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN &&
88 gart_info->table_handle) {
89 drm_ati_free_pcigart_table(dev, gart_info);
90 }
91
92 return 1;
93 }
94 EXPORT_SYMBOL(drm_ati_pcigart_cleanup);
95
drm_ati_pcigart_init(struct drm_device * dev,struct drm_ati_pcigart_info * gart_info)96 int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
97 {
98 struct drm_local_map *map = &gart_info->mapping;
99 struct drm_sg_mem *entry = dev->sg;
100 void *address = NULL;
101 unsigned long pages;
102 u32 *pci_gart = NULL, page_base, gart_idx;
103 dma_addr_t bus_address = 0;
104 int i, j, ret = 0;
105 int max_ati_pages, max_real_pages;
106
107 if (!entry) {
108 DRM_ERROR("no scatter/gather memory!\n");
109 goto done;
110 }
111
112 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
113 DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
114
115 if (pci_set_dma_mask(dev->pdev, gart_info->table_mask)) {
116 DRM_ERROR("fail to set dma mask to 0x%Lx\n",
117 (unsigned long long)gart_info->table_mask);
118 ret = 1;
119 goto done;
120 }
121
122 ret = drm_ati_alloc_pcigart_table(dev, gart_info);
123 if (ret) {
124 DRM_ERROR("cannot allocate PCI GART page!\n");
125 goto done;
126 }
127
128 pci_gart = gart_info->table_handle->vaddr;
129 address = gart_info->table_handle->vaddr;
130 bus_address = gart_info->table_handle->busaddr;
131 } else {
132 address = gart_info->addr;
133 bus_address = gart_info->bus_addr;
134 DRM_DEBUG("PCI: Gart Table: VRAM %08LX mapped at %08lX\n",
135 (unsigned long long)bus_address,
136 (unsigned long)address);
137 }
138
139
140 max_ati_pages = (gart_info->table_size / sizeof(u32));
141 max_real_pages = max_ati_pages / (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE);
142 pages = (entry->pages <= max_real_pages)
143 ? entry->pages : max_real_pages;
144
145 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
146 memset(pci_gart, 0, max_ati_pages * sizeof(u32));
147 } else {
148 memset_io((void __iomem *)map->handle, 0, max_ati_pages * sizeof(u32));
149 }
150
151 gart_idx = 0;
152 for (i = 0; i < pages; i++) {
153 /* we need to support large memory configurations */
154 entry->busaddr[i] = pci_map_page(dev->pdev, entry->pagelist[i],
155 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
156 if (pci_dma_mapping_error(dev->pdev, entry->busaddr[i])) {
157 DRM_ERROR("unable to map PCIGART pages!\n");
158 drm_ati_pcigart_cleanup(dev, gart_info);
159 address = NULL;
160 bus_address = 0;
161 goto done;
162 }
163 page_base = (u32) entry->busaddr[i];
164
165 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
166 u32 val;
167
168 switch(gart_info->gart_reg_if) {
169 case DRM_ATI_GART_IGP:
170 val = page_base | 0xc;
171 break;
172 case DRM_ATI_GART_PCIE:
173 val = (page_base >> 8) | 0xc;
174 break;
175 default:
176 case DRM_ATI_GART_PCI:
177 val = page_base;
178 break;
179 }
180 if (gart_info->gart_table_location ==
181 DRM_ATI_GART_MAIN)
182 pci_gart[gart_idx] = cpu_to_le32(val);
183 else
184 DRM_WRITE32(map, gart_idx * sizeof(u32), val);
185 gart_idx++;
186 page_base += ATI_PCIGART_PAGE_SIZE;
187 }
188 }
189 ret = 1;
190
191 #if defined(__i386__) || defined(__x86_64__)
192 wbinvd();
193 #else
194 mb();
195 #endif
196
197 done:
198 gart_info->addr = address;
199 gart_info->bus_addr = bus_address;
200 return ret;
201 }
202 EXPORT_SYMBOL(drm_ati_pcigart_init);
203