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 <josephchan@via.com.tw>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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 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;
+}