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ppc4xx: Enable auto RS485 mode on PLU405 boards

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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>
This commit is contained in:
Matthias Fuchs 2009-01-02 12:16:35 +01:00 committed by Stefan Roese
parent 5f01ea63a6
commit fceebb45a0
1 changed files with 10 additions and 0 deletions
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10
board/esd/plu405/plu405.c
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@ -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);
}