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 }
79
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