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 <drm/drmP.h>
36
37 #include <drm/ati_pcigart.h>
38
39 # define ATI_PCIGART_PAGE_SIZE 4096 /**< PCI GART page size */
40
drm_ati_alloc_pcigart_table(struct drm_device * dev,struct drm_ati_pcigart_info * gart_info)41 static int drm_ati_alloc_pcigart_table(struct drm_device *dev,
42 struct drm_ati_pcigart_info *gart_info)
43 {
44 gart_info->table_handle = drm_pci_alloc(dev, gart_info->table_size,
45 PAGE_SIZE);
46 if (gart_info->table_handle == NULL)
47 return -ENOMEM;
48
49 return 0;
50 }
51
drm_ati_free_pcigart_table(struct drm_device * dev,struct drm_ati_pcigart_info * gart_info)52 static void drm_ati_free_pcigart_table(struct drm_device *dev,
53 struct drm_ati_pcigart_info *gart_info)
54 {
55 drm_pci_free(dev, gart_info->table_handle);
56 gart_info->table_handle = NULL;
57 }
58
drm_ati_pcigart_cleanup(struct drm_device * dev,struct drm_ati_pcigart_info * gart_info)59 int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
60 {
61 struct drm_sg_mem *entry = dev->sg;
62 unsigned long pages;
63 int i;
64 int max_pages;
65
66 /* we need to support large memory configurations */
67 if (!entry) {
68 DRM_ERROR("no scatter/gather memory!\n");
69 return 0;
70 }
71
72 if (gart_info->bus_addr) {
73
74 max_pages = (gart_info->table_size / sizeof(u32));
75 pages = (entry->pages <= max_pages)
76 ? entry->pages : max_pages;
77
78 for (i = 0; i < pages; i++) {
79 if (!entry->busaddr[i])
80 break;
81 pci_unmap_page(dev->pdev, entry->busaddr[i],
82 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
83 }
84
85 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
86 gart_info->bus_addr = 0;
87 }
88
89 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN &&
90 gart_info->table_handle) {
91 drm_ati_free_pcigart_table(dev, gart_info);
92 }
93
94 return 1;
95 }
96 EXPORT_SYMBOL(drm_ati_pcigart_cleanup);
97
drm_ati_pcigart_init(struct drm_device * dev,struct drm_ati_pcigart_info * gart_info)98 int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
99 {
100 struct drm_local_map *map = &gart_info->mapping;
101 struct drm_sg_mem *entry = dev->sg;
102 void *address = NULL;
103 unsigned long pages;
104 u32 *pci_gart = NULL, page_base, gart_idx;
105 dma_addr_t bus_address = 0;
106 int i, j, ret = 0;
107 int max_ati_pages, max_real_pages;
108
109 if (!entry) {
110 DRM_ERROR("no scatter/gather memory!\n");
111 goto done;
112 }
113
114 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
115 DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
116
117 if (pci_set_dma_mask(dev->pdev, gart_info->table_mask)) {
118 DRM_ERROR("fail to set dma mask to 0x%Lx\n",
119 (unsigned long long)gart_info->table_mask);
120 ret = 1;
121 goto done;
122 }
123
124 ret = drm_ati_alloc_pcigart_table(dev, gart_info);
125 if (ret) {
126 DRM_ERROR("cannot allocate PCI GART page!\n");
127 goto done;
128 }
129
130 pci_gart = gart_info->table_handle->vaddr;
131 address = gart_info->table_handle->vaddr;
132 bus_address = gart_info->table_handle->busaddr;
133 } else {
134 address = gart_info->addr;
135 bus_address = gart_info->bus_addr;
136 DRM_DEBUG("PCI: Gart Table: VRAM %08LX mapped at %08lX\n",
137 (unsigned long long)bus_address,
138 (unsigned long)address);
139 }
140
141
142 max_ati_pages = (gart_info->table_size / sizeof(u32));
143 max_real_pages = max_ati_pages / (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE);
144 pages = (entry->pages <= max_real_pages)
145 ? entry->pages : max_real_pages;
146
147 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
148 memset(pci_gart, 0, max_ati_pages * sizeof(u32));
149 } else {
150 memset_io((void __iomem *)map->handle, 0, max_ati_pages * sizeof(u32));
151 }
152
153 gart_idx = 0;
154 for (i = 0; i < pages; i++) {
155 /* we need to support large memory configurations */
156 entry->busaddr[i] = pci_map_page(dev->pdev, entry->pagelist[i],
157 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
158 if (pci_dma_mapping_error(dev->pdev, entry->busaddr[i])) {
159 DRM_ERROR("unable to map PCIGART pages!\n");
160 drm_ati_pcigart_cleanup(dev, gart_info);
161 address = NULL;
162 bus_address = 0;
163 goto done;
164 }
165 page_base = (u32) entry->busaddr[i];
166
167 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
168 u32 val;
169
170 switch(gart_info->gart_reg_if) {
171 case DRM_ATI_GART_IGP:
172 val = page_base | 0xc;
173 break;
174 case DRM_ATI_GART_PCIE:
175 val = (page_base >> 8) | 0xc;
176 break;
177 default:
178 case DRM_ATI_GART_PCI:
179 val = page_base;
180 break;
181 }
182 if (gart_info->gart_table_location ==
183 DRM_ATI_GART_MAIN)
184 pci_gart[gart_idx] = cpu_to_le32(val);
185 else
186 DRM_WRITE32(map, gart_idx * sizeof(u32), val);
187 gart_idx++;
188 page_base += ATI_PCIGART_PAGE_SIZE;
189 }
190 }
191 ret = 1;
192
193 #if defined(__i386__) || defined(__x86_64__)
194 wbinvd();
195 #else
196 mb();
197 #endif
198
199 done:
200 gart_info->addr = address;
201 gart_info->bus_addr = bus_address;
202 return ret;
203 }
204 EXPORT_SYMBOL(drm_ati_pcigart_init);
205