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tty: serial: Add CONSOLE_POLL support to SiFive UART

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Add CONSOLE_POLL support for future KGDB porting.

Signed-off-by: Vincent 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vincent Chen 2020-03-18 08:40:27 +08:00 committed by Greg Kroah-Hartman
parent 089b6d3654
commit 630db5cbc7
1 changed files with 27 additions and 0 deletions
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27
drivers/tty/serial/sifive.c
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@ -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 = {