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ppc4xx: Initialize magnetic coupler on VOM405 boards

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This patch fixes an ugly behavior of the IL712 magnetic coupler
as used on VOM405. These parts will remember their last state
over a power cycle which might cause unwanted behavior.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Matthias Fuchs 2009-10-27 19:58:09 +01:00 committed by Stefan Roese
parent be0db3e314
commit 3ffc0d61ba
1 changed files with 35 additions and 0 deletions
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35
board/esd/vom405/vom405.c
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@ -26,11 +26,40 @@
#include <asm/io.h>
#include <command.h>
#include <malloc.h>
#include <sja1000.h>
DECLARE_GLOBAL_DATA_PTR;
extern void lxt971_no_sleep(void);
/*
* generate a short spike on the CAN tx line
* to bring the couplers in sync
*/
void init_coupler(u32 addr)
{
struct sja1000_basic_s *ctrl = (struct sja1000_basic_s *)addr;
/* reset */
out_8(&ctrl->cr, CR_RR);
/* dominant */
out_8(&ctrl->btr0, 0x00); /* btr setup is required */
out_8(&ctrl->btr1, 0x14); /* we use 1Mbit/s */
out_8(&ctrl->oc, OC_TP1 | OC_TN1 | OC_POL1 |
OC_TP0 | OC_TN0 | OC_POL0 | OC_MODE1);
out_8(&ctrl->cr, 0x00);
/* delay */
in_8(&ctrl->cr);
in_8(&ctrl->cr);
in_8(&ctrl->cr);
in_8(&ctrl->cr);
/* reset */
out_8(&ctrl->cr, CR_RR);
}
int board_early_init_f (void)
{
/*
@ -77,6 +106,12 @@ int misc_init_r (void)
gd->bd->bi_flashstart = 0 - gd->bd->bi_flashsize;
gd->bd->bi_flashoffset = 0;
/*
* Init magnetic coupler
*/
if (!getenv("noinitcoupler"))
init_coupler(CAN_BA);
return (0);
}