PCDR
outb(PCDR, CSCIR);
outb(PCDR, CSCIR);
*s++ = __raw_readb(PCDR);
volatile u_char PCDR; /* Port C Data Register */
pxa2xx_ac97_pcm_stereo_in.addr = regs->start + PCDR;
pxa2xx_ac97_pcm_stereo_out.addr = regs->start + PCDR;