Commit 630db5cb authored by Vincent Chen's avatar Vincent Chen Committed by Greg Kroah-Hartman
Browse files

tty: serial: Add CONSOLE_POLL support to SiFive UART 



Add CONSOLE_POLL support for future KGDB porting.

Signed-off-by: default avatarVincent Chen <vincent.chen@sifive.com>

Changes since v1:
1. Fix the compile error reported by kbuild test robot
Link: https://lore.kernel.org/r/1584492027-23236-1-git-send-email-vincent.chen@sifive.com



Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 089b6d36

drivers/tty/serial/sifive.c

+27 −0
Original line number Diff line number Diff line
@@ -729,6 +729,29 @@ static const char *sifive_serial_type(struct uart_port *port) 
	return port->type == PORT_SIFIVE_V0 ? "SiFive UART v0" : NULL;

}



#ifdef CONFIG_CONSOLE_POLL

static int sifive_serial_poll_get_char(struct uart_port *port)

{

	struct sifive_serial_port *ssp = port_to_sifive_serial_port(port);

	char is_empty, ch;



	ch = __ssp_receive_char(ssp, &is_empty);

	if (is_empty)

		return NO_POLL_CHAR;



	return ch;

}



static void sifive_serial_poll_put_char(struct uart_port *port,

					unsigned char c)

{

	struct sifive_serial_port *ssp = port_to_sifive_serial_port(port);



	__ssp_wait_for_xmitr(ssp);

	__ssp_transmit_char(ssp, c);

}

#endif /* CONFIG_CONSOLE_POLL */



/*

 * Early console support

 */
@@ -897,6 +920,10 @@ static const struct uart_ops sifive_serial_uops = { 
	.request_port	= sifive_serial_request_port,

	.config_port	= sifive_serial_config_port,

	.verify_port	= sifive_serial_verify_port,

#ifdef CONFIG_CONSOLE_POLL

	.poll_get_char	= sifive_serial_poll_get_char,

	.poll_put_char	= sifive_serial_poll_put_char,

#endif

};



static struct uart_driver sifive_serial_uart_driver = {

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