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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2014-09-10 21:29:56 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-26 18:01:56 +0200
commit234abab143aef82c0ef1f2de409c0db96b666f3c (patch)
tree45580c4dd61a49fb028a1b5ecf3fa637efe34ee7 /drivers
parenttty: Fix width of unsigned long bitfield padding (diff)
downloadlinux-234abab143aef82c0ef1f2de409c0db96b666f3c.tar.xz
linux-234abab143aef82c0ef1f2de409c0db96b666f3c.zip
tty: serial: 8250_core: allow to set ->throttle / ->unthrottle callbacks
The OMAP UART provides support for HW assisted flow control. What is missing is the support to throttle / unthrottle callbacks which are used by the omap-serial driver at the moment. This patch adds the callbacks. It should be safe to add them since they are only invoked from the serial_core (uart_throttle()) if the feature flags are set. Reviewed-by: Tony Lindgren <tony@atomide.com> Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/tty/serial/8250/8250_core.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index a0c1d64f34c5..68c44d97091b 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1319,6 +1319,16 @@ static void serial8250_start_tx(struct uart_port *port)
}
}
+static void serial8250_throttle(struct uart_port *port)
+{
+ port->throttle(port);
+}
+
+static void serial8250_unthrottle(struct uart_port *port)
+{
+ port->unthrottle(port);
+}
+
static void serial8250_stop_rx(struct uart_port *port)
{
struct uart_8250_port *up = up_to_u8250p(port);
@@ -2912,6 +2922,8 @@ static struct uart_ops serial8250_pops = {
.get_mctrl = serial8250_get_mctrl,
.stop_tx = serial8250_stop_tx,
.start_tx = serial8250_start_tx,
+ .throttle = serial8250_throttle,
+ .unthrottle = serial8250_unthrottle,
.stop_rx = serial8250_stop_rx,
.enable_ms = serial8250_enable_ms,
.break_ctl = serial8250_break_ctl,
@@ -3462,6 +3474,8 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
uart->capabilities = up->capabilities;
uart->rs485_config = up->rs485_config;
uart->rs485 = up->rs485;
+ uart->port.throttle = up->port.throttle;
+ uart->port.unthrottle = up->port.unthrottle;
/* Take tx_loadsz from fifosize if it wasn't set separately */
if (uart->port.fifosize && !uart->tx_loadsz)