PCI_REG_STATCMD
r = __raw_readl(ctx->regs + PCI_REG_STATCMD) & 0x0000ffff;
__raw_writel(r, ctx->regs + PCI_REG_STATCMD);
status = __raw_readl(ctx->regs + PCI_REG_STATCMD);
__raw_writel(status & 0xf000ffff, ctx->regs + PCI_REG_STATCMD);