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mpc5200/gpt: tiny fix for gpt period limitation 

This patch changes the period parameter of mpc52xx_gpt_start_timer to
a u64 to support larger timeout periods.

Signed-off-by: Albrecht Dreß <albrecht.dress@arcor.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Albrecht Dreß 2009-11-12 13:31:35 -07:00 committed by Grant Likely
parent 02d9e58e46
commit 690b846aa1
2 changed files with 4 additions and 4 deletions
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2
arch/powerpc/include/asm/mpc52xx.h
View File

@ -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 period,
extern int mpc52xx_gpt_start_timer(struct mpc52xx_gpt_priv *gpt, u64 period,
int continuous);
extern void mpc52xx_gpt_stop_timer(struct mpc52xx_gpt_priv *gpt);

6
arch/powerpc/platforms/52xx/mpc52xx_gpt.c
View File

@ -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 *gpt, int period,
* arithmatic is done here to preserve the precision until the value
* is scaled back down into the u32 range. Period is in 'ns', bus
* frequency is in Hz. */
clocks = (u64)period * (u64)gpt->ipb_freq;
clocks = period * (u64)gpt->ipb_freq;
do_div(clocks, 1000000000); /* Scale it down to ns range */
/* This device cannot handle a clock count greater than 32 bits */