* [PATCH] serial: imx: add support for loopback mode.
@ 2013-11-29 9:29 Huang Shijie
0 siblings, 0 replies; only message in thread
From: Huang Shijie @ 2013-11-29 9:29 UTC (permalink / raw)
To: gregkh; +Cc: linux-serial, linux-arm-kernel, Huang Shijie
Add the loopback mode support for imx uart driver.
Signed-off-by: Huang Shijie <b32955@freescale.com>
---
drivers/tty/serial/imx.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index b2cfdb6..d799140 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -806,6 +806,9 @@ static unsigned int imx_get_mctrl(struct uart_port *port)
if (readl(sport->port.membase + UCR2) & UCR2_CTS)
tmp |= TIOCM_RTS;
+ if (readl(sport->port.membase + uts_reg(sport)) & UTS_LOOP)
+ tmp |= TIOCM_LOOP;
+
return tmp;
}
@@ -821,6 +824,11 @@ static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
temp |= UCR2_CTS;
writel(temp, sport->port.membase + UCR2);
+
+ temp = readl(sport->port.membase + uts_reg(sport)) & ~UTS_LOOP;
+ if (mctrl & TIOCM_LOOP)
+ temp |= UTS_LOOP;
+ writel(temp, sport->port.membase + uts_reg(sport));
}
/*
--
1.7.2.rc3
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