ppc4xx: Enable auto RS485 mode on PLU405 boards

This patch turns on the auto RS485 mode in the 2nd external
uart on PLU405 boards. This is a special mode of the used
Exar XR16C2850 uart. Because these boards only have a 485 physical
layer connected it's a good idea to turn it on by default.

Signed-off-by: Matthias Fuchs <mf@esd.eu>
Signed-off-by: Stefan Roese <sr@denx.de>

diff --git a/board/esd/plu405/plu405.c b/board/esd/plu405/plu405.c
index 61186a8..85057a2 100644 (file)
--- a/board/esd/plu405/plu405.c
+++ b/board/esd/plu405/plu405.c
@@ -104,6 +104,7 @@ int misc_init_r (void)
        unsigned char *duart0_mcr = (unsigned char *)((ulong)DUART0_BA + 4);
        unsigned char *duart1_mcr = (unsigned char *)((ulong)DUART1_BA + 4);
        unsigned char *dst;
+       unsigned char fctr;
        ulong len = sizeof(fpgadata);
        int status;
        int index;
@@ -203,6 +204,15 @@ int misc_init_r (void)
        out_8(duart0_mcr, 0x08);
        out_8(duart1_mcr, 0x08);
 
+       /*
+        * Enable auto RS485 mode in 2nd external uart
+        */
+       out_8((void *)DUART1_BA + 3, 0xbf); /* write LCR */
+       fctr = in_8((void *)DUART1_BA + 1); /* read FCTR */
+       fctr |= 0x08;                       /* enable RS485 mode */
+       out_8((void *)DUART1_BA + 1, fctr); /* write FCTR */
+       out_8((void *)DUART1_BA + 3, 0);    /* write LCR */
+
        return (0);
 }