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ppc4xx: Initialize magnetic couplers in PLU405 

This patch fixes an ugly behavior of the IL712 magnetic couplers
as used on PLU405. 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 2009-10-26 09:58:45 +01:00 committed by Stefan Roese
parent 067f54c66a
commit be0db3e314
2 changed files with 38 additions and 1 deletions
board/esd/plu405
plu405.c
include/configs
PLU405.h

36
board/esd/plu405/plu405.c
View File

@ -26,6 +26,7 @@
#include <asm/io.h>
#include <command.h>
#include <malloc.h>
#include <sja1000.h>
#undef FPGA_DEBUG
@ -61,6 +62,34 @@ au_image_t au_image[] = {
int N_AU_IMAGES = (sizeof(au_image) / sizeof(au_image[0]));
/*
* 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);
}
/* Prototypes */
int gunzip(void *, int, unsigned char *, unsigned long *);
@ -214,6 +243,13 @@ int misc_init_r(void)
out_8((void *)DUART1_BA + 1, fctr); /* write FCTR */
out_8((void *)DUART1_BA + 3, 0); /* write LCR */
/*
* Init magnetic couplers
*/
if (!getenv("noinitcoupler")) {
init_coupler(CAN0_BA);
init_coupler(CAN1_BA);
}
return 0;
}

3
include/configs/PLU405.h
View File

@ -300,7 +300,8 @@
/*
* External Bus Controller (EBC) Setup
*/
#define CAN_BA 0xF0000000 /* CAN Base Address */
#define CAN0_BA 0xF0000000 /* CAN0 Base Address */
#define CAN1_BA 0xF0000100 /* CAN1 Base Address */
#define DUART0_BA 0xF0000400 /* DUART Base Address */
#define DUART1_BA 0xF0000408 /* DUART Base Address */
#define RTC_BA 0xF0000500 /* RTC Base Address */