Commit e1a9c179 authored by Denis V. Lunev's avatar Denis V. Lunev Committed by Greg Kroah-Hartman
Browse files

tty: serial: KGDB support for PXA 



Actually, in order to support KGDB over serial console one must
implement two callbacks for character polling. Clone them from
8250 driver with a bit of tuning.

Signed-off-by: default avatarDenis V. Lunev <den@openvz.org>
Signed-off-by: default avatarMarko Katic <dromede@gmail.com>
CC: Eric Miao <eric.y.miao@gmail.com>
CC: Russell King <linux@arm.linux.org.uk>
Acked-by: default avatarHaojian Zhuang <haojian.zhuang@gmail.com>

 drivers/tty/serial/pxa.c |   55 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 55 insertions(+), 0 deletions(-)
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c9739941

drivers/tty/serial/pxa.c

+55 −0
Original line number Diff line number Diff line
@@ -705,6 +705,57 @@ serial_pxa_console_write(struct console *co, const char *s, unsigned int count) 
	clk_disable_unprepare(up->clk);

}



#ifdef CONFIG_CONSOLE_POLL

/*

 * Console polling routines for writing and reading from the uart while

 * in an interrupt or debug context.

 */



static int serial_pxa_get_poll_char(struct uart_port *port)

{

	struct uart_pxa_port *up = (struct uart_pxa_port *)port;

	unsigned char lsr = serial_in(up, UART_LSR);



	while (!(lsr & UART_LSR_DR))

		lsr = serial_in(up, UART_LSR);



	return serial_in(up, UART_RX);

}





static void serial_pxa_put_poll_char(struct uart_port *port,

			 unsigned char c)

{

	unsigned int ier;

	struct uart_pxa_port *up = (struct uart_pxa_port *)port;



	/*

	 *	First save the IER then disable the interrupts

	 */

	ier = serial_in(up, UART_IER);

	serial_out(up, UART_IER, UART_IER_UUE);



	wait_for_xmitr(up);

	/*

	 *	Send the character out.

	 *	If a LF, also do CR...

	 */

	serial_out(up, UART_TX, c);

	if (c == 10) {

		wait_for_xmitr(up);

		serial_out(up, UART_TX, 13);

	}



	/*

	 *	Finally, wait for transmitter to become empty

	 *	and restore the IER

	 */

	wait_for_xmitr(up);

	serial_out(up, UART_IER, ier);

}



#endif /* CONFIG_CONSOLE_POLL */



static int __init

serial_pxa_console_setup(struct console *co, char *options)

{
@@ -759,6 +810,10 @@ struct uart_ops serial_pxa_pops = { 
	.request_port	= serial_pxa_request_port,

	.config_port	= serial_pxa_config_port,

	.verify_port	= serial_pxa_verify_port,

#ifdef CONFIG_CONSOLE_POLL

	.poll_get_char = serial_pxa_get_poll_char,

	.poll_put_char = serial_pxa_put_poll_char,

#endif

};



static struct uart_driver serial_pxa_reg = {

CRA Git | Maintained and supported by SUSTech CRA and CCSE