1 files changed, 78 insertions, 0 deletions

diff --git a/drivers/video/via/iface.c b/drivers/video/via/iface.c
new file mode 100644
index 000000000000..1570636c8d51
--- /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;
+}