Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[pandora-kernel.git] / arch / powerpc / kernel / time.c

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index eae4511..465e498 100644 (file)
--- 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)
@@ -769,11 +774,12 @@ int update_persistent_clock(struct timespec now)
        return ppc_md.set_rtc_time(&tm);
 }
 
-unsigned long read_persistent_clock(void)
+void read_persistent_clock(struct timespec *ts)
 {
        struct rtc_time tm;
        static int first = 1;
 
+       ts->tv_nsec = 0;
        /* XXX this is a litle fragile but will work okay in the short term */
        if (first) {
                first = 0;
@@ -781,14 +787,18 @@ unsigned long read_persistent_clock(void)
                        timezone_offset = ppc_md.time_init();
 
                /* get_boot_time() isn't guaranteed to be safe to call late */
-               if (ppc_md.get_boot_time)
-                       return ppc_md.get_boot_time() -timezone_offset;
+               if (ppc_md.get_boot_time) {
+                       ts->tv_sec = ppc_md.get_boot_time() - timezone_offset;
+                       return;
+               }
+       }
+       if (!ppc_md.get_rtc_time) {
+               ts->tv_sec = 0;
+               return;
        }
-       if (!ppc_md.get_rtc_time)
-               return 0;
        ppc_md.get_rtc_time(&tm);
-       return mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
-                     tm.tm_hour, tm.tm_min, tm.tm_sec);
+       ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
+                           tm.tm_hour, tm.tm_min, tm.tm_sec);
 }
 
 /* clocksource code */
@@ -913,6 +923,11 @@ 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 +1031,11 @@ 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();