AST_VHUB_IER
vhub->regs + AST_VHUB_IER);
writel(0, vhub->regs + AST_VHUB_IER);
writel(0, vhub->regs + AST_VHUB_IER);
writel(reg, d->vhub->regs + AST_VHUB_IER);
reg = readl(d->vhub->regs + AST_VHUB_IER);
writel(reg, d->vhub->regs + AST_VHUB_IER);
reg = readl(d->vhub->regs + AST_VHUB_IER);