diff options
Diffstat (limited to 'src/northbridge/amd/lx/grphinit.c')
-rw-r--r-- | src/northbridge/amd/lx/grphinit.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/northbridge/amd/lx/grphinit.c b/src/northbridge/amd/lx/grphinit.c new file mode 100644 index 0000000000..4e0da1789d --- /dev/null +++ b/src/northbridge/amd/lx/grphinit.c @@ -0,0 +1,43 @@ +#include <arch/io.h> +#include <stdint.h> +#include <cpu/amd/vr.h> + +#define VIDEO_MB 8 // MB of video memory + +/* + * Write to a Virtual Register + * AX = Class/Index + * CX = data to write + */ +void vrWrite(uint16_t wClassIndex, uint16_t wData) +{ + outl(((uint32_t) VR_UNLOCK << 16) | wClassIndex, VRC_INDEX); + outw(wData, VRC_DATA); +} + + /* + * Read from a Virtual Register + * AX = Class/Index + * Returns a 16-bit word of data + */ +uint16_t vrRead(uint16_t wClassIndex) +{ + uint16_t wData; + outl(((uint32_t) VR_UNLOCK << 16) | wClassIndex, VRC_INDEX); + wData = inw(VRC_DATA); + return wData; +} + +/* + * 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)); +} + + |