diff options
Diffstat (limited to 'board/esd/plu405')
| -rw-r--r-- | board/esd/plu405/plu405.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/board/esd/plu405/plu405.c b/board/esd/plu405/plu405.c index f14ef7a..c733587 100644 --- a/board/esd/plu405/plu405.c +++ b/board/esd/plu405/plu405.c @@ -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; } |