From 73c92a4a7c1f9f0ff4451a5b34da9d18978e90e2 Mon Sep 17 00:00:00 2001 From: "Ronald G. Minnich" Date: Mon, 12 Jun 2006 20:37:33 +0000 Subject: ron forget an svn add. git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2319 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- src/northbridge/amd/gx2/grphinit.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 src/northbridge/amd/gx2/grphinit.c (limited to 'src/northbridge/amd') 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 +#include + +#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)); +} + + -- cgit v1.2.3