linux-kernel - [PATCH 1/4] FB: Get the Geode GX frambuffer size from the BIOS

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Message-ID: <20060724165600.18822.56476.stgit@cosmic.amd.com>
Date:	Mon, 24 Jul 2006 10:56:00 -0600
From:	"Jordan Crouse" <jordan.crouse@....com>
To:	akpm@...l.org
cc:	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net, blizzard@...hat.com,
	dwmw2@...hat.com
Subject: [PATCH 1/4] FB: Get the Geode GX frambuffer size from the BIOS

From: Jordan Crouse <jordan.crouse@....com>

Use the Geode GX BIOS virtual registers to get the actual size of the
framebuffer.

Signed-off-by: Jordan Crouse <jordan.crouse@....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;


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