The PCM030 CPU module comes with a 33.333 MHz instead of a 33.333333 MHz
crystal reference. If such a special reference is in use, the USB PLL
needs a tweak to create a correct frequency. Without this tweak the USB
does not work correctly.
Signed-off-by: Juergen Borleis <jbe@xxxxxxxxxxxxxx>
---
arch/ppc/boards/pcm030/config.h | 2 +-
arch/ppc/boards/pcm030/pcm030.c | 9 +++++++++
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch/ppc/boards/pcm030/config.h b/arch/ppc/boards/pcm030/config.h
index 1521811..3fe1f28 100644
--- a/arch/ppc/boards/pcm030/config.h
+++ b/arch/ppc/boards/pcm030/config.h
@@ -25,7 +25,7 @@
#include <mach/mpc5xxx.h>
-#define CFG_MPC5XXX_CLKIN 33333333 /* ... running at 33.333333MHz */
+#define CFG_MPC5XXX_CLKIN 33333000 /* ... running at 33.333MHz */
#define CFG_HID0_INIT HID0_ICE | HID0_ICFI
#define CFG_HID0_FINAL HID0_ICE
diff --git a/arch/ppc/boards/pcm030/pcm030.c b/arch/ppc/boards/pcm030/pcm030.c
index a7fa21d..376891a 100644
--- a/arch/ppc/boards/pcm030/pcm030.c
+++ b/arch/ppc/boards/pcm030/pcm030.c
@@ -32,6 +32,7 @@
#include <memory.h>
#include <linux/sizes.h>
#include <linux/stat.h>
+#include <asm/io.h>
#include <fs.h>
static struct fec_platform_data fec_info = {
@@ -43,6 +44,14 @@ static int devices_init (void)
struct stat s;
int ret;
+#if CFG_MPC5XXX_CLKIN == 33333000
+ /*
+ * Make USB work due to the special base crystal frequency:
+ * 33,3330MHz * 16 = 533,328MHz main clock, but should be 528 MHz Clock
+ */
+ out_be32((void *)MPC5XXX_CDM_48_FDC, 0x00015555);
+#endif
+
/*
* Flash can be 16MB or 32MB, setup for the last 32MB no matter
* what we find later.
--
2.1.4
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