ron forget an svn add.

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2319 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 37 insertions, 0 deletions

diff --git a/src/northbridge/amd/gx2/grphinit.c b/src/northbridge/amd/gx2/grphinit.c
new file mode 100644
index 0000000000..1d115c8c76
--- /dev/null
+++ b/src/northbridge/amd/gx2/grphinit.c
@@ -0,0 +1,37 @@
+#include <arch/io.h>
+#include <stdint.h>
+
+#define VIDEO_MB	8					// MB of video memory
+
+#define VRC_INDEX				0xAC1C	// Index register
+#define VRC_DATA				0xAC1E	// Data register
+#define VR_UNLOCK				0xFC53	// Virtual register unlock code
+#define	VRC_VG					0x02	// SoftVG Class
+#define	VG_MEM_SIZE				0x00	// bits 7:0 - 512K unit size, bit 8 controller priority
+
+
+/*
+ * Write to a Virtual Register
+ * AX = Class/Index
+ * CX = data to write
+ */
+static void vrWrite(uint16_t wClassIndex, uint16_t wData)
+{
+	outl(((uint32_t) VR_UNLOCK << 16) | wClassIndex, VRC_INDEX);
+	outw(wData, VRC_DATA);
+}
+
+
+/*
+ * This function mirrors the Graphics_Init routine in GeodeROM.
+ */
+void graphics_init(void)
+{
+	/* SoftVG initialization */
+
+	/* Call SoftVG with the main configuration parameters. */
+	/* NOTE: SoftVG expects the memory size to be given in 512 KB pages */
+	vrWrite((VRC_VG <<  8) + VG_MEM_SIZE, 0x0100 | (VIDEO_MB * 2));
+}
+
+