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
--- a/board/esd/plu405/plu405.c
+++ b/board/esd/plu405/plu405.c
@@ -104,6 +104,7 @@
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 @@
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);
}
