in carriers/tpci200.c [69:76]
static void tpci200_clear_mask(struct tpci200_board *tpci200,
__le16 __iomem *addr, u16 mask)
{
unsigned long flags;
spin_lock_irqsave(&tpci200->regs_lock, flags);
iowrite16(ioread16(addr) & (~mask), addr);
spin_unlock_irqrestore(&tpci200->regs_lock, flags);
}