FB: Get the Geode GX frambuffer size from the BIOS

[Jordan Crouse]

Commit:     7281703e0d862388f8a6d276864c92b2e96acc9a
Parent:     cbd556651c8511cda7659a5580e1484ee3e66f0d
commit 7281703e0d862388f8a6d276864c92b2e96acc9a
Author:     Jordan Crouse <jordan.crouse at amd.com>
AuthorDate: Mon May 15 20:54:51 2006 -0600
Commit:     David Woodhouse <dwmw2 at infradead.org>
CommitDate: Mon Jun 19 16:23:02 2006 +0100

    FB: Get the Geode GX frambuffer size from the BIOS
    
    Use the Geode GX BIOS virtual registers to get the actual size of the
    framebuffer.
    
    Signed-off-by: Jordan Crouse <jordan.crouse at amd.com>
---
 drivers/video/geode/display_gx.c |   15 ++++++++++++---
 drivers/video/geode/display_gx.h |    2 +-
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/video/geode/display_gx.c b/drivers/video/geode/display_gx.c
index 825c340..0245169 100644
--- a/drivers/video/geode/display_gx.c
+++ b/drivers/video/geode/display_gx.c
@@ -21,10 +21,19 @@ #include <asm/delay.h>
 #include "geodefb.h"
 #include "display_gx.h"
 
-int gx_frame_buffer_size(void)
+unsigned int gx_frame_buffer_size(void)
 {
-	/* Assuming 16 MiB. */
-	return 16*1024*1024;
+	unsigned int val;
+
+	/* FB size is reported by a virtual register */
+	/* Virtual register class = 0x02 */
+	/* VG_MEM_SIZE(512Kb units) = 0x00 */
+
+	outw(0xFC53, 0xAC1C);
+	outw(0x0200, 0xAC1C);
+
+	val = (unsigned int)(inw(0xAC1E)) & 0xFFl;
+	return (val << 19);
 }
 
 int gx_line_delta(int xres, int bpp)
diff --git a/drivers/video/geode/display_gx.h b/drivers/video/geode/display_gx.h
index 86c6233..41e79f4 100644
--- a/drivers/video/geode/display_gx.h
+++ b/drivers/video/geode/display_gx.h
@@ -11,7 +11,7 @@
 #ifndef __DISPLAY_GX_H__
 #define __DISPLAY_GX_H__
 
-int gx_frame_buffer_size(void);
+unsigned int gx_frame_buffer_size(void);
 int gx_line_delta(int xres, int bpp);
 
 extern struct geode_dc_ops gx_dc_ops;