Beispiel #1
0
static int m32r_sio_startup(struct uart_port *port)
{
	struct uart_sio_port *up =
		container_of(port, struct uart_sio_port, port);
	int retval;

	sio_init();

	/*
	 * If the "interrupt" for this port doesn't correspond with any
	 * hardware interrupt, we use a timer-based system.  The original
	 * driver used to do this with IRQ0.
	 */
	if (!up->port.irq) {
		unsigned int timeout = up->port.timeout;

		timeout = timeout > 6 ? (timeout / 2 - 2) : 1;

		up->timer.data = (unsigned long)up;
		mod_timer(&up->timer, jiffies + timeout);
	} else {
		retval = serial_link_irq_chain(up);
		if (retval)
			return retval;
	}

	/*
	 * Finally, enable interrupts.  Note: Modem status interrupts
	 * are set via set_termios(), which will be occurring imminently
	 * anyway, so we don't enable them here.
	 * - M32R_SIO: 0x0c
	 * - M32R_PLDSIO: 0x04
	 */
	up->ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
	sio_out(up, SIOTRCR, up->ier);

	/*
	 * And clear the interrupt registers again for luck.
	 */
	sio_reset();

	return 0;
}
Beispiel #2
0
static int serial8250_startup(struct uart_port *port)
{
	struct uart_8250_port *up = (struct uart_8250_port *)port;
	unsigned long flags;
	int retval;

	/*
	 * Clear the FIFO buffers and disable them.
	 * (they will be reeanbled in set_termios())
	 */
	if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
		serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
		serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
				UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
		serial_outp(up, UART_FCR, 0);
	}

	/*
	 * Clear the interrupt registers.
	 */
	(void) serial_inp(up, UART_LSR);
	(void) serial_inp(up, UART_RX);
	(void) serial_inp(up, UART_IIR);
	(void) serial_inp(up, UART_MSR);

	/*
	 * At this point, there's no way the LSR could still be 0xff;
	 * if it is, then bail out, because there's likely no UART
	 * here.
	 */
	if (!(up->port.flags & UPF_BUGGY_UART) &&
	    (serial_inp(up, UART_LSR) == 0xff)) {
		printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
		return -ENODEV;
	}

	retval = serial_link_irq_chain(up);
		if (retval)
			return retval;

	/*
	 * Now, initialize the UART
	 */
	serial_outp(up, UART_LCR, UART_LCR_WLEN8);

	spin_lock_irqsave(&up->port.lock, flags);
	if (up->port.flags & UPF_FOURPORT) {
		if (!is_real_interrupt(up->port.irq))
			up->port.mctrl |= TIOCM_OUT1;
	} else
		/*
		 * Most PC uarts need OUT2 raised to enable interrupts.
		 */
		if (is_real_interrupt(up->port.irq))
			up->port.mctrl |= TIOCM_OUT2;

	serial8250_set_mctrl(&up->port, up->port.mctrl);
	spin_unlock_irqrestore(&up->port.lock, flags);

	/*
	 * Finally, enable interrupts.  Note: Modem status interrupts
	 * are set via set_termios(), which will be occurring imminently
	 * anyway, so we don't enable them here.
	 */
	up->ier = UART_IER_RLSI | UART_IER_RDI;
	serial_outp(up, UART_IER, up->ier);

	if (up->port.flags & UPF_FOURPORT) {
		unsigned int icp;
		/*
		 * Enable interrupts on the AST Fourport board
		 */
		icp = (up->port.iobase & 0xfe0) | 0x01f;
		outb_p(0x80, icp);
		(void) inb_p(icp);
	}

	/*
	 * And clear the interrupt registers again for luck.
	 */
	(void) serial_inp(up, UART_LSR);
	(void) serial_inp(up, UART_RX);
	(void) serial_inp(up, UART_IIR);
	(void) serial_inp(up, UART_MSR);

	return 0;
}