From: "Albrecht Dreß" <albrecht.dress@arcor•de>
To: grant.likely@secretlab•ca
Cc: linuxppc-dev@ozlabs•org
Subject: [PATCH] mpc5200/gpt: tiny fix for gpt period limitation
Date: Wed, 11 Nov 2009 09:49:29 +0100 (CET) [thread overview]
Message-ID: <18304285.1257929369240.JavaMail.ngmail@webmail19.ha2.local> (raw)
This patch fixes a limitation of the 5200's period.
Signed-off-by: Albrecht Dre=DF <albrecht.dress@arcor•de>
---
arch/powerpc/include/asm/mpc52xx.h | 2 +-
arch/powerpc/platforms/52xx/mpc52xx_gpt.c | 6 +++---
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/include/asm/mpc52xx.h b/arch/powerpc/include/asm/=
mpc52xx.h
index 707ab75..933fb8f 100644
--- a/arch/powerpc/include/asm/mpc52xx.h
+++ b/arch/powerpc/include/asm/mpc52xx.h
@@ -279,7 +279,7 @@ extern void mpc52xx_restart(char *cmd);
/* mpc52xx_gpt.c */
struct mpc52xx_gpt_priv;
extern struct mpc52xx_gpt_priv *mpc52xx_gpt_from_irq(int irq);
-extern int mpc52xx_gpt_start_timer(struct mpc52xx_gpt_priv *gpt, int perio=
d,
+extern int mpc52xx_gpt_start_timer(struct mpc52xx_gpt_priv *gpt, u64 perio=
d,
int continuous);
extern void mpc52xx_gpt_stop_timer(struct mpc52xx_gpt_priv *gpt);
=20
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c b/arch/powerpc/platf=
orms/52xx/mpc52xx_gpt.c
index 2c3fa13..77572ab 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
@@ -378,12 +378,12 @@ EXPORT_SYMBOL(mpc52xx_gpt_from_irq);
/**
* mpc52xx_gpt_start_timer - Set and enable the GPT timer
* @gpt: Pointer to gpt private data structure
- * @period: period of timer
+ * @period: period of timer in ns; max. ~130s @ 33MHz IPB clock
* @continuous: set to 1 to make timer continuous free running
*
* An interrupt will be generated every time the timer fires
*/
-int mpc52xx_gpt_start_timer(struct mpc52xx_gpt_priv *gpt, int period,
+int mpc52xx_gpt_start_timer(struct mpc52xx_gpt_priv *gpt, u64 period,
int continuous)
{
u32 clear, set;
@@ -400,7 +400,7 @@ int mpc52xx_gpt_start_timer(struct mpc52xx_gpt_priv *gp=
t, int period,
* arithmatic is done here to preserve the precision until the valu=
e
* is scaled back down into the u32 range. Period is in 'ns', bus
* frequency is in Hz. */
- clocks =3D (u64)period * (u64)gpt->ipb_freq;
+ clocks =3D period * (u64)gpt->ipb_freq;
do_div(clocks, 1000000000); /* Scale it down to ns range */
=20
/* This device cannot handle a clock count greater than 32 bits */
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next reply other threads:[~2009-11-11 8:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-11 8:49 Albrecht Dreß [this message]
2009-11-12 21:15 ` [PATCH] mpc5200/gpt: tiny fix for gpt period limitation Grant Likely
2009-11-12 21:44 ` Wolfram Sang
2009-11-13 0:21 ` Grant Likely
2009-11-13 9:25 ` Albrecht Dreß
-- strict thread matches above, loose matches on Subject: below --
2009-11-13 9:24 Albrecht Dreß
2009-11-11 8:47 Albrecht Dreß
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