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c91b557a JC |
1 | /* |
2 | * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved. | |
3 | * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved. | |
4 | ||
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public | |
7 | * License as published by the Free Software Foundation; | |
8 | * either version 2, or (at your option) any later version. | |
9 | ||
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even | |
12 | * the implied warranty of MERCHANTABILITY or FITNESS FOR | |
13 | * A PARTICULAR PURPOSE.See the GNU General Public License | |
14 | * for more details. | |
15 | ||
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., | |
19 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | #include "global.h" | |
23 | ||
24 | /* Get frame buffer size from VGA BIOS */ | |
25 | ||
26 | unsigned int viafb_get_memsize(void) | |
27 | { | |
28 | unsigned int m; | |
29 | ||
30 | /* If memory size provided by user */ | |
31 | if (viafb_memsize) | |
32 | m = viafb_memsize * Mb; | |
33 | else { | |
34 | m = (unsigned int)viafb_read_reg(VIASR, SR39); | |
35 | m = m * (4 * Mb); | |
36 | ||
37 | if ((m < (16 * Mb)) || (m > (64 * Mb))) | |
38 | m = 16 * Mb; | |
39 | } | |
40 | DEBUG_MSG(KERN_INFO "framebuffer size = %d Mb\n", m / Mb); | |
41 | return m; | |
42 | } | |
43 | ||
44 | /* Get Video Buffer Starting Physical Address(back door)*/ | |
45 | ||
46 | unsigned long viafb_get_videobuf_addr(void) | |
47 | { | |
48 | struct pci_dev *pdev = NULL; | |
49 | unsigned char sys_mem; | |
50 | unsigned char video_mem; | |
51 | unsigned long sys_mem_size; | |
52 | unsigned long video_mem_size; | |
53 | /*system memory = 256 MB, video memory 64 MB */ | |
54 | unsigned long vmem_starting_adr = 0x0C000000; | |
55 | ||
56 | pdev = | |
57 | (struct pci_dev *)pci_get_device(VIA_K800_BRIDGE_VID, | |
58 | VIA_K800_BRIDGE_DID, NULL); | |
59 | if (pdev != NULL) { | |
60 | pci_read_config_byte(pdev, VIA_K800_SYSTEM_MEMORY_REG, | |
61 | &sys_mem); | |
62 | pci_read_config_byte(pdev, VIA_K800_VIDEO_MEMORY_REG, | |
63 | &video_mem); | |
64 | video_mem = (video_mem & 0x70) >> 4; | |
65 | sys_mem_size = ((unsigned long)sys_mem) << 24; | |
66 | if (video_mem != 0) | |
67 | video_mem_size = (1 << (video_mem)) * 1024 * 1024; | |
68 | else | |
69 | video_mem_size = 0; | |
70 | ||
71 | vmem_starting_adr = sys_mem_size - video_mem_size; | |
72 | pci_dev_put(pdev); | |
73 | } | |
74 | ||
75 | DEBUG_MSG(KERN_INFO "Video Memory Starting Address = %lx \n", | |
76 | vmem_starting_adr); | |
77 | return vmem_starting_adr; | |
78 | } |