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| author |   Vincent Chen <vincent.chen@sifive.com> | 2020-03-18 08:40:27 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-18 11:07:13 +0100 |
| commit | 630db5cbc7b444bf47cd717906abb092a2ab5724 (patch) | |
| tree | e4fc8f171343fb0e6589a001eb74e4d774c5fe3d /drivers/tty | |
| parent | serial: 8250_port: Disable DMA operations for kernel console (diff) | |
| download | wireguard-linux-630db5cbc7b444bf47cd717906abb092a2ab5724.tar.xz wireguard-linux-630db5cbc7b444bf47cd717906abb092a2ab5724.zip | |
tty: serial: Add CONSOLE_POLL support to SiFive UART
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/sifive.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c index d34031e842d0..13eadcb8aec4 100644 --- a/drivers/tty/serial/sifive.c +++ b/drivers/tty/serial/sifive.c @@ -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 = { |