imx: Add save/restore functions for UART control regs

Factor out the uart save/restore functionality instead of
having the same code several times in the driver.

Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
CC: Saleem Abdulrasool <compnerd@compnerd.org>
CC: Sascha Hauer <s.hauer@pengutronix.de>
CC: Fabio Estevam <festevam@gmail.com>
CC: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
CC: linux-serial@vger.kernel.org
CC: Alan Cox <alan@linux.intel.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 35 insertions, 8 deletions

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 92a5987924cf..225922c7ce99 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -207,6 +207,12 @@ struct imx_port {
         struct imx_uart_data    *devdata;
 };
 
+struct imx_port_ucrs {
+        unsigned int    ucr1;
+        unsigned int    ucr2;
+        unsigned int    ucr3;
+};
+
 #ifdef CONFIG_IRDA
 #define USE_IRDA(sport) ((sport)->use_irda)
 #else
@@ -260,6 +266,27 @@ static inline int is_imx21_uart(struct imx_port *sport)
 }
 
 /*
+ * Save and restore functions for UCR1, UCR2 and UCR3 registers
+ */
+static void imx_port_ucrs_save(struct uart_port *port,
+                               struct imx_port_ucrs *ucr)
+{
+        /* save control registers */
+        ucr->ucr1 = readl(port->membase + UCR1);
+        ucr->ucr2 = readl(port->membase + UCR2);
+        ucr->ucr3 = readl(port->membase + UCR3);
+}
+
+static void imx_port_ucrs_restore(struct uart_port *port,
+                                  struct imx_port_ucrs *ucr)
+{
+        /* restore control registers */
+        writel(ucr->ucr1, port->membase + UCR1);
+        writel(ucr->ucr2, port->membase + UCR2);
+        writel(ucr->ucr3, port->membase + UCR3);
+}
+
+/*
  * Handle any change of modem status signal since we were last called.
  */
 static void imx_mctrl_check(struct imx_port *sport)
@@ -1121,13 +1148,14 @@ static void
 imx_console_write(struct console *co, const char *s, unsigned int count)
 {
         struct imx_port *sport = imx_ports[co->index];
-        unsigned int old_ucr1, old_ucr2, ucr1;
+        struct imx_port_ucrs old_ucr;
+        unsigned int ucr1;
 
         /*
-         *      First, save UCR1/2 and then disable interrupts
+         *      First, save UCR1/2/3 and then disable interrupts
          */
-        ucr1 = old_ucr1 = readl(sport->port.membase + UCR1);
-        old_ucr2 = readl(sport->port.membase + UCR2);
+        imx_port_ucrs_save(&sport->port, &old_ucr);
+        ucr1 = old_ucr.ucr1;
 
         if (is_imx1_uart(sport))
                 ucr1 |= IMX1_UCR1_UARTCLKEN;
@@ -1136,18 +1164,17 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
 
         writel(ucr1, sport->port.membase + UCR1);
 
-        writel(old_ucr2 | UCR2_TXEN, sport->port.membase + UCR2);
+        writel(old_ucr.ucr2 | UCR2_TXEN, sport->port.membase + UCR2);
 
         uart_console_write(&sport->port, s, count, imx_console_putchar);
 
         /*
          *      Finally, wait for transmitter to become empty
-         *      and restore UCR1/2
+         *      and restore UCR1/2/3
          */
         while (!(readl(sport->port.membase + USR2) & USR2_TXDC));
 
-        writel(old_ucr1, sport->port.membase + UCR1);
-        writel(old_ucr2, sport->port.membase + UCR2);
+        imx_port_ucrs_restore(&sport->port, &old_ucr);
 }
 
 /*