[U-Boot] [PATCH] ppc4xx: Initialize magnetic couplers on PLU405
Matthias Fuchs
matthias.fuchs at esd-electronics.com
Thu Oct 22 23:08:14 CEST 2009
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 at esd.eu>
---
board/esd/plu405/plu405.c | 33 +++++++++++++++++++++++++++++++++
include/configs/PLU405.h | 3 ++-
2 files changed, 35 insertions(+), 1 deletions(-)
diff --git a/board/esd/plu405/plu405.c b/board/esd/plu405/plu405.c
index 1841cda..7e6bf3b 100644
--- a/board/esd/plu405/plu405.c
+++ b/board/esd/plu405/plu405.c
@@ -45,6 +45,32 @@ const unsigned char fpgadata[] =
*/
#include "../common/fpga.c"
+/*
+ * generate a short spike on the CAN tx line
+ * to bring the couplers in sync
+ */
+void init_coupler(u32 addr)
+{
+ u8 *ctrl = (u8*)addr;
+
+ /* reset */
+ out_8(ctrl, 0x21);
+
+ /* dominant */
+ out_8(ctrl + 6, 0x00);
+ out_8(ctrl + 7, 0x14);
+ out_8(ctrl + 8, 0xfe);
+ out_8(ctrl, 0x20);
+
+ /* delay */
+ in_8(ctrl);
+ in_8(ctrl);
+ in_8(ctrl);
+
+ /* reset */
+ out_8(ctrl, 0x21);
+}
+
/* Prototypes */
int gunzip(void *, int, unsigned char *, unsigned long *);
@@ -198,6 +224,13 @@ 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;
}
diff --git a/include/configs/PLU405.h b/include/configs/PLU405.h
index 07fc715..b6740de 100644
--- a/include/configs/PLU405.h
+++ b/include/configs/PLU405.h
@@ -298,7 +298,8 @@
/*
* 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 */
--
1.5.6.3
More information about the U-Boot
mailing list