| Joseph Chan | c91b557 | 2008-10-15 22:03:24 -0700 | [diff] [blame] | 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 | } |