diff options
| -rw-r--r-- | src/northbridge/amd/gx2/grphinit.c | 37 |
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)); +} + + |