diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2015-10-18 19:34:46 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-12-14 03:59:48 (GMT) |
| commit | 90ebc4838666d148eac5bbac6f4044e5b25cd2d6 (patch) | |
| tree | 9e4c1e9f67750b433be9c376901fd459a945f140 | |
| parent | 18dfef9c7f87b75bbb0fb66a634f7c13a45b9f8d (diff) | |
| download | linux-90ebc4838666d148eac5bbac6f4044e5b25cd2d6.tar.xz | |
serial: imx: repair and complete handshaking
The .get_mctrl callback should not report the status of RTS or LOOP, so
drop this. Instead implement reporting the state of CAR (aka DCD) and
RI.
For .set_mctrl implement setting the DTR line.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/imx.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 76818f5..086675e 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -148,8 +148,11 @@ #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */ #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */ #define USR2_IDLE (1<<12) /* Idle condition */ +#define USR2_RIDELT (1<<10) /* Ring Interrupt Delta */ +#define USR2_RIIN (1<<9) /* Ring Indicator Input */ #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */ #define USR2_WAKE (1<<7) /* Wake */ +#define USR2_DCDIN (1<<5) /* Data Carrier Detect Input */ #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */ #define USR2_TXDC (1<<3) /* Transmitter complete */ #define USR2_BRCD (1<<2) /* Break condition */ @@ -804,16 +807,19 @@ static unsigned int imx_tx_empty(struct uart_port *port) static unsigned int imx_get_mctrl(struct uart_port *port) { struct imx_port *sport = (struct imx_port *)port; - unsigned int tmp = TIOCM_DSR | TIOCM_CAR; + unsigned int tmp = TIOCM_DSR; + unsigned usr1 = readl(sport->port.membase + USR1); - if (readl(sport->port.membase + USR1) & USR1_RTSS) + if (usr1 & USR1_RTSS) tmp |= TIOCM_CTS; - if (readl(sport->port.membase + UCR2) & UCR2_CTS) - tmp |= TIOCM_RTS; + /* in DCE mode DCDIN is always 0 */ + if (!(usr1 & USR2_DCDIN)) + tmp |= TIOCM_CAR; - if (readl(sport->port.membase + uts_reg(sport)) & UTS_LOOP) - tmp |= TIOCM_LOOP; + /* in DCE mode RIIN is always 0 */ + if (readl(sport->port.membase + USR2) & USR2_RIIN) + tmp |= TIOCM_RI; return tmp; } @@ -831,6 +837,11 @@ static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl) writel(temp, sport->port.membase + UCR2); } + temp = readl(sport->port.membase + UCR3) & ~UCR3_DSR; + if (!(mctrl & TIOCM_DTR)) + temp |= UCR3_DSR; + writel(temp, sport->port.membase + UCR3); + temp = readl(sport->port.membase + uts_reg(sport)) & ~UTS_LOOP; if (mctrl & TIOCM_LOOP) temp |= UTS_LOOP; |