[PATCH v6 3/3] tty: 8250_omap: Use software emulated RS485 direction control

Matwey V. Kornilov
2015-12-21T18:26:19Z

Use software emulated RS485 direction control to provide RS485 API existed in
omap_serial driver. Note that 8250_omap issues interrupt on shift register
empty which is single prerequesite for using software emulated RS485.

Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru>
---
drivers/tty/serial/8250/8250_omap.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 826c5c4..323c0a4 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -698,6 +698,23 @@ static void omap_8250_throttle(struct uart_port *port)
pm_runtime_put_autosuspend(port->dev);
}

+static int omap_8250_rs485_config(struct uart_port *port, struct serial_rs485 *rs485)
+{
+ struct uart_8250_port *up = up_to_u8250p(port);
+
+ if (rs485->flags & SER_RS485_ENABLED && !serial8250_em485_enabled(up)) {
+ port->rs485 = *rs485;
+ return serial8250_em485_init(up);
+ }
+
+ if (serial8250_em485_enabled(up) && !(rs485->flags & SER_RS485_ENABLED))
+ serial8250_em485_destroy(up);
+
+ port->rs485 = *rs485;
+
+ return 0;
+}
+
static void omap_8250_unthrottle(struct uart_port *port)
{
unsigned long flags;
@@ -1144,6 +1161,7 @@ static int omap8250_probe(struct platform_device *pdev)
up.port.shutdown = omap_8250_shutdown;
up.port.throttle = omap_8250_throttle;
up.port.unthrottle = omap_8250_unthrottle;
+ up.port.rs485_config = omap_8250_rs485_config;

if (pdev->dev.of_node) {
const struct of_device_id *id;
--
2.6.3