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authorJordan Crouse <jordan.crouse@amd.com>2006-12-08 02:40:52 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-08 08:29:08 -0800
commit4c1979c8963528cc6f52203ae62162ed22e171f4 (patch)
treedc3219a7767747fc6e5476d7ea8aec104b8d0852 /drivers/video
parent4437cd1e98409e236a9d303fb742fdd53b3a20bb (diff)
[PATCH] 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@amd.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Acked-by: James Simmons <jsimmons@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/geode/display_gx.c15
-rw-r--r--drivers/video/geode/display_gx.h2
2 files changed, 13 insertions, 4 deletions
diff --git a/drivers/video/geode/display_gx.c b/drivers/video/geode/display_gx.c
index 825c3405f5c..0245169366b 100644
--- a/drivers/video/geode/display_gx.c
+++ b/drivers/video/geode/display_gx.c
@@ -21,10 +21,19 @@
#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 86c62336130..41e79f44067 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;