static inline int __mp_put_char(struct sb_uart_port *port, struct circ_buf *circ, unsigned char c)
{
	unsigned long flags;
	int ret = 0;

	if (!circ->buf)
		return 0;

	spin_lock_irqsave(&port->lock, flags);
	if (uart_circ_chars_free(circ) != 0) {
		circ->buf[circ->head] = c;
		circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1);
		ret = 1;
	}
	spin_unlock_irqrestore(&port->lock, flags);
	return ret;
}

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