IMX_GPT_CR
WRITE4(sc, IMX_GPT_CR, 0);
WRITE4(sc, IMX_GPT_CR, ctlreg);
WRITE4(sc, IMX_GPT_CR, ctlreg | GPT_CR_SWR);
while (READ4(sc, IMX_GPT_CR) & GPT_CR_SWR)
WRITE4(sc, IMX_GPT_CR, ctlreg | GPT_CR_EN);
sc->clkfreq / 1000, basefreq, READ4(sc, IMX_GPT_CR), READ4(sc, IMX_GPT_PR));