Merge git://git.kernel.org/pub/scm/linux/kernel/git/joern/logfs

[pandora-kernel.git] / drivers / serial / imx.c

diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index e579d7a..eacb588 100644 (file)
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -46,6 +46,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/rational.h>
+#include <linux/slab.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -119,7 +120,8 @@
 #define  MX2_UCR3_RXDMUXSEL     (1<<2)  /* RXD Muxed Input Select, on mx2/mx3 */
 #define  UCR3_INVT      (1<<1)  /* Inverted Infrared transmission */
 #define  UCR3_BPEN      (1<<0)  /* Preset registers enable */
-#define  UCR4_CTSTL_32   (32<<10) /* CTS trigger level (32 chars) */
+#define  UCR4_CTSTL_SHF  10      /* CTS trigger level shift */
+#define  UCR4_CTSTL_MASK 0x3F    /* CTS trigger is 6 bits wide */
 #define  UCR4_INVR      (1<<9)  /* Inverted infrared reception */
 #define  UCR4_ENIRI     (1<<8)  /* Serial infrared interrupt enable */
 #define  UCR4_WKEN      (1<<7)  /* Wake interrupt enable */
@@ -590,6 +592,9 @@ static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
        return 0;
 }
 
+/* half the RX buffer size */
+#define CTSTL 16
+
 static int imx_startup(struct uart_port *port)
 {
        struct imx_port *sport = (struct imx_port *)port;
@@ -606,6 +611,10 @@ static int imx_startup(struct uart_port *port)
        if (USE_IRDA(sport))
                temp |= UCR4_IRSC;
 
+       /* set the trigger level for CTS */
+       temp &= ~(UCR4_CTSTL_MASK<<  UCR4_CTSTL_SHF);
+       temp |= CTSTL<<  UCR4_CTSTL_SHF;
+
        writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
 
        if (USE_IRDA(sport)) {