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Commit 1db894ec authored by Alexey Charkov's avatar Alexey Charkov Committed by Greg Kroah-Hartman
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tty: vt8500_serial: add polled console functions 



This adds simple polling functions for single-character transmit
and receive, as used by kgdb.

Signed-off-by: default avatarAlexey Charkov <alchark@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8c986d3e

drivers/tty/serial/vt8500_serial.c

+31 −0
Original line number Original line Diff line number Diff line
@@ -558,6 +558,33 @@ static struct console vt8500_console = { 
#define VT8500_CONSOLE	NULL

#define VT8500_CONSOLE	NULL

#endif

#endif





#ifdef CONFIG_CONSOLE_POLL

static int vt8500_get_poll_char(struct uart_port *port)

{

	unsigned int status = vt8500_read(port, VT8500_URFIDX);



	if (!(status & 0x1f00))

		return NO_POLL_CHAR;



	return vt8500_read(port, VT8500_RXFIFO) & 0xff;

}



static void vt8500_put_poll_char(struct uart_port *port, unsigned char c)

{

	unsigned int status, tmout = 10000;



	do {

		status = vt8500_read(port, VT8500_URFIDX);



		if (--tmout == 0)

			break;

		udelay(1);

	} while (status & 0x10);



	vt8500_write(port, c, VT8500_TXFIFO);

}

#endif



static struct uart_ops vt8500_uart_pops = {

static struct uart_ops vt8500_uart_pops = {

	.tx_empty	= vt8500_tx_empty,

	.tx_empty	= vt8500_tx_empty,

	.set_mctrl	= vt8500_set_mctrl,

	.set_mctrl	= vt8500_set_mctrl,
@@ -575,6 +602,10 @@ static struct uart_ops vt8500_uart_pops = { 
	.request_port	= vt8500_request_port,

	.request_port	= vt8500_request_port,

	.config_port	= vt8500_config_port,

	.config_port	= vt8500_config_port,

	.verify_port	= vt8500_verify_port,

	.verify_port	= vt8500_verify_port,

#ifdef CONFIG_CONSOLE_POLL

	.poll_get_char	= vt8500_get_poll_char,

	.poll_put_char	= vt8500_put_poll_char,

#endif

};

};





static struct uart_driver vt8500_uart_driver = {

static struct uart_driver vt8500_uart_driver = {