From c91b557ad0a4d4803874f8b908aa9732152b0f0b Mon Sep 17 00:00:00 2001 From: Joseph Chan Date: Wed, 15 Oct 2008 22:03:24 -0700 Subject: viafb: iface.c, iface.h, ioctl.c, ioctl.h iface.c, iface.h: support getting video memory from backdoor. ioctl.c, ioctl.h: support user mode application with additional information Signed-off-by: Joseph Chan Cc: Krzysztof Helt Cc: Geert Uytterhoeven Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/via/iface.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 drivers/video/via/iface.c (limited to 'drivers/video/via/iface.c') diff --git a/drivers/video/via/iface.c b/drivers/video/via/iface.c new file mode 100644 index 00000000000..1570636c8d5 --- /dev/null +++ b/drivers/video/via/iface.c @@ -0,0 +1,78 @@ +/* + * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved. + * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved. + + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; + * either version 2, or (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even + * the implied warranty of MERCHANTABILITY or FITNESS FOR + * A PARTICULAR PURPOSE.See the GNU General Public License + * for more details. + + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include "global.h" + +/* Get frame buffer size from VGA BIOS */ + +unsigned int viafb_get_memsize(void) +{ + unsigned int m; + + /* If memory size provided by user */ + if (viafb_memsize) + m = viafb_memsize * Mb; + else { + m = (unsigned int)viafb_read_reg(VIASR, SR39); + m = m * (4 * Mb); + + if ((m < (16 * Mb)) || (m > (64 * Mb))) + m = 16 * Mb; + } + DEBUG_MSG(KERN_INFO "framebuffer size = %d Mb\n", m / Mb); + return m; +} + +/* Get Video Buffer Starting Physical Address(back door)*/ + +unsigned long viafb_get_videobuf_addr(void) +{ + struct pci_dev *pdev = NULL; + unsigned char sys_mem; + unsigned char video_mem; + unsigned long sys_mem_size; + unsigned long video_mem_size; + /*system memory = 256 MB, video memory 64 MB */ + unsigned long vmem_starting_adr = 0x0C000000; + + pdev = + (struct pci_dev *)pci_get_device(VIA_K800_BRIDGE_VID, + VIA_K800_BRIDGE_DID, NULL); + if (pdev != NULL) { + pci_read_config_byte(pdev, VIA_K800_SYSTEM_MEMORY_REG, + &sys_mem); + pci_read_config_byte(pdev, VIA_K800_VIDEO_MEMORY_REG, + &video_mem); + video_mem = (video_mem & 0x70) >> 4; + sys_mem_size = ((unsigned long)sys_mem) << 24; + if (video_mem != 0) + video_mem_size = (1 << (video_mem)) * 1024 * 1024; + else + video_mem_size = 0; + + vmem_starting_adr = sys_mem_size - video_mem_size; + pci_dev_put(pdev); + } + + DEBUG_MSG(KERN_INFO "Video Memory Starting Address = %lx \n", + vmem_starting_adr); + return vmem_starting_adr; +} -- cgit v1.2.3