diff options
Diffstat (limited to 'arch/powerpc/kernel/time.c')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 33 |
1 files changed, 24 insertions, 9 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index eae4511ceea..a180b4f9a4f 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -479,7 +479,8 @@ static int __init iSeries_tb_recal(void) unsigned long tb_ticks = tb - iSeries_recal_tb; unsigned long titan_usec = (titan - iSeries_recal_titan) >> 12; unsigned long new_tb_ticks_per_sec = (tb_ticks * USEC_PER_SEC)/titan_usec; - unsigned long new_tb_ticks_per_jiffy = (new_tb_ticks_per_sec+(HZ/2))/HZ; + unsigned long new_tb_ticks_per_jiffy = + DIV_ROUND_CLOSEST(new_tb_ticks_per_sec, HZ); long tick_diff = new_tb_ticks_per_jiffy - tb_ticks_per_jiffy; char sign = '+'; /* make sure tb_ticks_per_sec and tb_ticks_per_jiffy are consistent */ @@ -726,6 +727,18 @@ static int __init get_freq(char *name, int cells, unsigned long *val) return found; } +/* should become __cpuinit when secondary_cpu_time_init also is */ +void start_cpu_decrementer(void) +{ +#if defined(CONFIG_BOOKE) || defined(CONFIG_40x) + /* Clear any pending timer interrupts */ + mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS); + + /* Enable decrementer interrupt */ + mtspr(SPRN_TCR, TCR_DIE); +#endif /* defined(CONFIG_BOOKE) || defined(CONFIG_40x) */ +} + void __init generic_calibrate_decr(void) { ppc_tb_freq = DEFAULT_TB_FREQ; /* hardcoded default */ @@ -745,14 +758,6 @@ void __init generic_calibrate_decr(void) printk(KERN_ERR "WARNING: Estimating processor frequency " "(not found)\n"); } - -#if defined(CONFIG_BOOKE) || defined(CONFIG_40x) - /* Clear any pending timer interrupts */ - mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS); - - /* Enable decrementer interrupt */ - mtspr(SPRN_TCR, TCR_DIE); -#endif } int update_persistent_clock(struct timespec now) @@ -913,6 +918,11 @@ static void __init init_decrementer_clockevent(void) void secondary_cpu_time_init(void) { + /* Start the decrementer on CPUs that have manual control + * such as BookE + */ + start_cpu_decrementer(); + /* FIME: Should make unrelatred change to move snapshot_timebase * call here ! */ register_decrementer_clockevent(smp_processor_id()); @@ -1016,6 +1026,11 @@ void __init time_init(void) write_sequnlock_irqrestore(&xtime_lock, flags); + /* Start the decrementer on CPUs that have manual control + * such as BookE + */ + start_cpu_decrementer(); + /* Register the clocksource, if we're not running on iSeries */ if (!firmware_has_feature(FW_FEATURE_ISERIES)) clocksource_init(); |