From 2d1e5a48965be57eefce033894d9795672f6ab63 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jos=C3=A9=20Miguel=20Gon=C3=A7alves?= Date: Wed, 18 Sep 2013 16:52:49 +0100 Subject: [PATCH] serial: samsung: add support for manual RTS setting MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The Samsung serial driver currently does not support setting the RTS pin with an ioctl(TIOCMSET) call. This patch adds this support. Changes in v2: - Preserve the RTS pin's manual setting in set_termios() also when enabling CRTSCTS. Signed-off-by: José Miguel Gonçalves Reviewed-by: Tomasz Figa Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/samsung.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 81f3dbabaaed..c1af04d46682 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -407,7 +407,14 @@ static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port) static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) { - /* todo - possibly remove AFC and do manual CTS */ + unsigned int umcon = rd_regl(port, S3C2410_UMCON); + + if (mctrl & TIOCM_RTS) + umcon |= S3C2410_UMCOM_RTS_LOW; + else + umcon &= ~S3C2410_UMCOM_RTS_LOW; + + wr_regl(port, S3C2410_UMCON, umcon); } static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) @@ -774,8 +781,6 @@ static void s3c24xx_serial_set_termios(struct uart_port *port, if (termios->c_cflag & CSTOPB) ulcon |= S3C2410_LCON_STOPB; - umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0; - if (termios->c_cflag & PARENB) { if (termios->c_cflag & PARODD) ulcon |= S3C2410_LCON_PODD; @@ -792,6 +797,15 @@ static void s3c24xx_serial_set_termios(struct uart_port *port, wr_regl(port, S3C2410_ULCON, ulcon); wr_regl(port, S3C2410_UBRDIV, quot); + + umcon = rd_regl(port, S3C2410_UMCON); + if (termios->c_cflag & CRTSCTS) { + umcon |= S3C2410_UMCOM_AFC; + /* Disable RTS when RX FIFO contains 63 bytes */ + umcon &= ~S3C2412_UMCON_AFC_8; + } else { + umcon &= ~S3C2410_UMCOM_AFC; + } wr_regl(port, S3C2410_UMCON, umcon); if (ourport->info->has_divslot)