fhc
struct fhc *p = kzalloc_obj(*p);
u32 __iomem *fhc;
conf = sbus_readl(par->fhc);
rev = (sbus_readl(par->fhc) >> CG6_FHC_REV_SHIFT) & CG6_FHC_REV_MASK;
conf = (sbus_readl(par->fhc) & CG6_FHC_RES_MASK) |
sbus_writel(conf, par->fhc);
if (par->fhc)
of_iounmap(&op->resource[0], par->fhc, sizeof(u32));
par->fhc = of_ioremap(&op->resource[0], CG6_FHC_OFFSET,
!par->bt || !par->fhc || !info->screen_base)