Merge branch 'upstream-fixes'
[linux-2.6] / drivers / char / drm / ati_pcigart.c
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 "drmP.h"
35
36 #if PAGE_SIZE == 65536
37 # define ATI_PCIGART_TABLE_ORDER        0
38 # define ATI_PCIGART_TABLE_PAGES        (1 << 0)
39 #elif PAGE_SIZE == 16384
40 # define ATI_PCIGART_TABLE_ORDER        1
41 # define ATI_PCIGART_TABLE_PAGES        (1 << 1)
42 #elif PAGE_SIZE == 8192
43 # define ATI_PCIGART_TABLE_ORDER        2
44 # define ATI_PCIGART_TABLE_PAGES        (1 << 2)
45 #elif PAGE_SIZE == 4096
46 # define ATI_PCIGART_TABLE_ORDER        3
47 # define ATI_PCIGART_TABLE_PAGES        (1 << 3)
48 #else
49 # error - PAGE_SIZE not 64K, 16K, 8K or 4K
50 #endif
51
52 # define ATI_MAX_PCIGART_PAGES          8192    /**< 32 MB aperture, 4K pages */
53 # define ATI_PCIGART_PAGE_SIZE          4096    /**< PCI GART page size */
54
55 static void *drm_ati_alloc_pcigart_table(void)
56 {
57         unsigned long address;
58         struct page *page;
59         int i;
60         DRM_DEBUG("%s\n", __FUNCTION__);
61
62         address = __get_free_pages(GFP_KERNEL | __GFP_COMP,
63                                    ATI_PCIGART_TABLE_ORDER);
64         if (address == 0UL) {
65                 return NULL;
66         }
67
68         page = virt_to_page(address);
69
70         for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++)
71                 SetPageReserved(page);
72
73         DRM_DEBUG("%s: returning 0x%08lx\n", __FUNCTION__, address);
74         return (void *)address;
75 }
76
77 static void drm_ati_free_pcigart_table(void *address)
78 {
79         struct page *page;
80         int i;
81         DRM_DEBUG("%s\n", __FUNCTION__);
82
83         page = virt_to_page((unsigned long)address);
84
85         for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++)
86                 ClearPageReserved(page);
87
88         free_pages((unsigned long)address, ATI_PCIGART_TABLE_ORDER);
89 }
90
91 int drm_ati_pcigart_cleanup(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
92 {
93         drm_sg_mem_t *entry = dev->sg;
94         unsigned long pages;
95         int i;
96
97         /* we need to support large memory configurations */
98         if (!entry) {
99                 DRM_ERROR("no scatter/gather memory!\n");
100                 return 0;
101         }
102
103         if (gart_info->bus_addr) {
104                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
105                         pci_unmap_single(dev->pdev, gart_info->bus_addr,
106                                          ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
107                                          PCI_DMA_TODEVICE);
108                 }
109
110                 pages = (entry->pages <= ATI_MAX_PCIGART_PAGES)
111                     ? entry->pages : ATI_MAX_PCIGART_PAGES;
112
113                 for (i = 0; i < pages; i++) {
114                         if (!entry->busaddr[i])
115                                 break;
116                         pci_unmap_single(dev->pdev, entry->busaddr[i],
117                                          PAGE_SIZE, PCI_DMA_TODEVICE);
118                 }
119
120                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
121                         gart_info->bus_addr = 0;
122         }
123
124         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN
125             && gart_info->addr) {
126                 drm_ati_free_pcigart_table(gart_info->addr);
127                 gart_info->addr = NULL;
128         }
129
130         return 1;
131 }
132
133 EXPORT_SYMBOL(drm_ati_pcigart_cleanup);
134
135 int drm_ati_pcigart_init(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
136 {
137         drm_sg_mem_t *entry = dev->sg;
138         void *address = NULL;
139         unsigned long pages;
140         u32 *pci_gart, page_base, bus_address = 0;
141         int i, j, ret = 0;
142
143         if (!entry) {
144                 DRM_ERROR("no scatter/gather memory!\n");
145                 goto done;
146         }
147
148         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
149                 DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
150
151                 address = drm_ati_alloc_pcigart_table();
152                 if (!address) {
153                         DRM_ERROR("cannot allocate PCI GART page!\n");
154                         goto done;
155                 }
156
157                 if (!dev->pdev) {
158                         DRM_ERROR("PCI device unknown!\n");
159                         goto done;
160                 }
161
162                 bus_address = pci_map_single(dev->pdev, address,
163                                              ATI_PCIGART_TABLE_PAGES *
164                                              PAGE_SIZE, PCI_DMA_TODEVICE);
165                 if (bus_address == 0) {
166                         DRM_ERROR("unable to map PCIGART pages!\n");
167                         drm_ati_free_pcigart_table(address);
168                         address = NULL;
169                         goto done;
170                 }
171         } else {
172                 address = gart_info->addr;
173                 bus_address = gart_info->bus_addr;
174                 DRM_DEBUG("PCI: Gart Table: VRAM %08X mapped at %08lX\n",
175                           bus_address, (unsigned long)address);
176         }
177
178         pci_gart = (u32 *) address;
179
180         pages = (entry->pages <= ATI_MAX_PCIGART_PAGES)
181             ? entry->pages : ATI_MAX_PCIGART_PAGES;
182
183         memset(pci_gart, 0, ATI_MAX_PCIGART_PAGES * sizeof(u32));
184
185         for (i = 0; i < pages; i++) {
186                 /* we need to support large memory configurations */
187                 entry->busaddr[i] = pci_map_single(dev->pdev,
188                                                    page_address(entry->
189                                                                 pagelist[i]),
190                                                    PAGE_SIZE, PCI_DMA_TODEVICE);
191                 if (entry->busaddr[i] == 0) {
192                         DRM_ERROR("unable to map PCIGART pages!\n");
193                         drm_ati_pcigart_cleanup(dev, gart_info);
194                         address = NULL;
195                         bus_address = 0;
196                         goto done;
197                 }
198                 page_base = (u32) entry->busaddr[i];
199
200                 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
201                         if (gart_info->is_pcie)
202                                 *pci_gart = cpu_to_le32((page_base >> 8) | 0xc);
203                         else
204                                 *pci_gart = cpu_to_le32(page_base);
205                         pci_gart++;
206                         page_base += ATI_PCIGART_PAGE_SIZE;
207                 }
208         }
209
210         ret = 1;
211
212 #if defined(__i386__) || defined(__x86_64__)
213         wbinvd();
214 #else
215         mb();
216 #endif
217
218       done:
219         gart_info->addr = address;
220         gart_info->bus_addr = bus_address;
221         return ret;
222 }
223
224 EXPORT_SYMBOL(drm_ati_pcigart_init);