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Commit ceca629e authored by Sascha Hauer's avatar Sascha Hauer Committed by Russell King
Browse files

[ARM] 2971/1: i.MX uart handle rts irq 



Patch from Sascha Hauer

handle rts interrupt

Signed-off-by: default avatarGiancarlo Formicuccia <giancarlo.formicuccia@gmail.com>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 9f693d7b

drivers/serial/imx.c

+33 −6
Original line number Diff line number Diff line
@@ -73,7 +73,7 @@ struct imx_port { 
	struct uart_port	port;

	struct timer_list	timer;

	unsigned int		old_status;

	int txirq,rxirq;

	int txirq,rxirq,rtsirq;

};



/*
@@ -181,6 +181,22 @@ static void imx_start_tx(struct uart_port *port) 
		imx_transmit_buffer(sport);

}



static irqreturn_t imx_rtsint(int irq, void *dev_id, struct pt_regs *regs)

{

	struct imx_port *sport = (struct imx_port *)dev_id;

	unsigned int val = USR1((u32)sport->port.membase)&USR1_RTSS;

	unsigned long flags;



	spin_lock_irqsave(&sport->port.lock, flags);



	USR1((u32)sport->port.membase) = USR1_RTSD;

	uart_handle_cts_change(&sport->port, !!val);

	wake_up_interruptible(&sport->port.info->delta_msr_wait);



	spin_unlock_irqrestore(&sport->port.lock, flags);

	return IRQ_HANDLED;

}



static irqreturn_t imx_txint(int irq, void *dev_id, struct pt_regs *regs)

{

	struct imx_port *sport = (struct imx_port *)dev_id;
@@ -386,15 +402,21 @@ static int imx_startup(struct uart_port *port) 
	if (retval) goto error_out1;



	retval = request_irq(sport->txirq, imx_txint, 0,

			     "imx-uart", sport);

			     DRIVER_NAME, sport);

	if (retval) goto error_out2;



	retval = request_irq(sport->rtsirq, imx_rtsint, 0,

			     DRIVER_NAME, sport);

	if (retval) goto error_out3;

	set_irq_type(sport->rtsirq, IRQT_BOTHEDGE);



	/*

	 * Finally, clear and enable interrupts

	 */



	USR1((u32)sport->port.membase) = USR1_RTSD;

	UCR1((u32)sport->port.membase) |=

	                 (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_UARTEN);

	                 (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);



	UCR2((u32)sport->port.membase) |= (UCR2_RXEN | UCR2_TXEN);

	/*
@@ -406,6 +428,8 @@ static int imx_startup(struct uart_port *port) 


	return 0;



error_out3:

	free_irq(sport->txirq, sport);

error_out2:

	free_irq(sport->rxirq, sport);

error_out1:
@@ -424,6 +448,7 @@ static void imx_shutdown(struct uart_port *port) 
	/*

	 * Free the interrupts

	 */

	free_irq(sport->rtsirq, sport);

	free_irq(sport->txirq, sport);

	free_irq(sport->rxirq, sport);
@@ -432,7 +457,7 @@ static void imx_shutdown(struct uart_port *port) 
	 */



	UCR1((u32)sport->port.membase) &=

	                 ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_UARTEN);

	                 ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);

}



static void
@@ -522,7 +547,7 @@ imx_set_termios(struct uart_port *port, struct termios *termios, 
	 * disable interrupts and drain transmitter

	 */

	old_ucr1 = UCR1((u32)sport->port.membase);

	UCR1((u32)sport->port.membase) &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN);

	UCR1((u32)sport->port.membase) &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);



	while ( !(USR2((u32)sport->port.membase) & USR2_TXDC))

		barrier();
@@ -643,6 +668,7 @@ static struct imx_port imx_ports[] = { 
	{

	.txirq  = UART1_MINT_TX,

	.rxirq  = UART1_MINT_RX,

	.rtsirq = UART1_MINT_RTS,

	.port	= {

		.type		= PORT_IMX,

		.iotype		= SERIAL_IO_MEM,
@@ -658,6 +684,7 @@ static struct imx_port imx_ports[] = { 
	}, {

	.txirq  = UART2_MINT_TX,

	.rxirq  = UART2_MINT_RX,

	.rtsirq = UART2_MINT_RTS,

	.port	= {

		.type		= PORT_IMX,

		.iotype		= SERIAL_IO_MEM,
@@ -737,7 +764,7 @@ imx_console_write(struct console *co, const char *s, unsigned int count) 


	UCR1((u32)sport->port.membase) =

	                   (old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN)

	                   & ~(UCR1_TXMPTYEN | UCR1_RRDYEN);

	                   & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);

	UCR2((u32)sport->port.membase) = old_ucr2 | UCR2_TXEN;



	/*