extif_read32
*n = extif_read32(extif, SSB_EXTIF_CLOCK_N);
*m = extif_read32(extif, SSB_EXTIF_CLOCK_SB);
return extif_read32(extif, SSB_EXTIF_GPIO_IN) & mask;
value |= extif_read32(extif, offset) & ~mask;