From: Juergen Borleis <jbe@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 4/5] PPC/PCM030: fix reference clock
Date: Fri, 24 Jul 2015 15:42:05 +0200 [thread overview]
Message-ID: <1437745326-8994-5-git-send-email-jbe@pengutronix.de> (raw)
In-Reply-To: <1437745326-8994-1-git-send-email-jbe@pengutronix.de>
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@pengutronix.de>
---
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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next prev parent reply other threads:[~2015-07-24 13:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-24 13:42 [PATCH] PowerPC/MPC5200 Juergen Borleis
2015-07-24 13:42 ` [PATCH 1/5] PPC/MPC52xx: add some useful GPIO definitions Juergen Borleis
2015-07-24 13:42 ` [PATCH 2/5] Devicetree/PPC: fix devicetree's fixup Juergen Borleis
2015-07-24 13:42 ` [PATCH 3/5] PPC/PCM030: remove nowhere used definitions Juergen Borleis
2015-07-24 13:42 ` Juergen Borleis [this message]
2015-07-27 5:42 ` [PATCH 4/5] PPC/PCM030: fix reference clock Sascha Hauer
2015-07-27 7:55 ` Juergen Borleis
2015-07-24 13:42 ` [PATCH 5/5] PPC/PCM030: enable USB/OHCI pin support Juergen Borleis
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