mmDMA_POWER_CNTL
orig = data = RREG32(mmDMA_POWER_CNTL + offset);
WREG32(mmDMA_POWER_CNTL + offset, data);
orig = data = RREG32(mmDMA_POWER_CNTL + offset);
WREG32(mmDMA_POWER_CNTL + offset, data);