UBRLCR_OFFSET
ubrlcr = readl(port->membase + UBRLCR_OFFSET);
writel(ubrlcr, port->membase + UBRLCR_OFFSET);
writel(readl(port->membase + UBRLCR_OFFSET) & ~UBRLCR_BREAK,
port->membase + UBRLCR_OFFSET);
writel(ubrlcr | (quot - 1), port->membase + UBRLCR_OFFSET);
ubrlcr = readl(port->membase + UBRLCR_OFFSET);