diff options
Diffstat (limited to 'arch/powerpc/kernel/time.c')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 69 |
1 files changed, 48 insertions, 21 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index a6282b625b44..de8479769bb7 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -62,8 +62,8 @@ #include <asm/irq.h> #include <asm/div64.h> #include <asm/smp.h> +#include <asm/vdso_datapage.h> #ifdef CONFIG_PPC64 -#include <asm/systemcfg.h> #include <asm/firmware.h> #endif #ifdef CONFIG_PPC_ISERIES @@ -130,6 +130,34 @@ unsigned long tb_last_stamp; */ DEFINE_PER_CPU(unsigned long, last_jiffy); +void __delay(unsigned long loops) +{ + unsigned long start; + int diff; + + if (__USE_RTC()) { + start = get_rtcl(); + do { + /* the RTCL register wraps at 1000000000 */ + diff = get_rtcl() - start; + if (diff < 0) + diff += 1000000000; + } while (diff < loops); + } else { + start = get_tbl(); + while (get_tbl() - start < loops) + HMT_low(); + HMT_medium(); + } +} +EXPORT_SYMBOL(__delay); + +void udelay(unsigned long usecs) +{ + __delay(tb_ticks_per_usec * usecs); +} +EXPORT_SYMBOL(udelay); + static __inline__ void timer_check_rtc(void) { /* @@ -261,7 +289,6 @@ static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec, do_gtod.varp = temp_varp; do_gtod.var_idx = temp_idx; -#ifdef CONFIG_PPC64 /* * tb_update_count is used to allow the userspace gettimeofday code * to assure itself that it sees a consistent view of the tb_to_xs and @@ -271,14 +298,15 @@ static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec, * tb_to_xs and stamp_xsec values are consistent. If not, then it * loops back and reads them again until this criteria is met. */ - ++(systemcfg->tb_update_count); + ++(vdso_data->tb_update_count); smp_wmb(); - systemcfg->tb_orig_stamp = new_tb_stamp; - systemcfg->stamp_xsec = new_stamp_xsec; - systemcfg->tb_to_xs = new_tb_to_xs; + vdso_data->tb_orig_stamp = new_tb_stamp; + vdso_data->stamp_xsec = new_stamp_xsec; + vdso_data->tb_to_xs = new_tb_to_xs; + vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec; + vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec; smp_wmb(); - ++(systemcfg->tb_update_count); -#endif + ++(vdso_data->tb_update_count); } /* @@ -357,8 +385,8 @@ static void iSeries_tb_recal(void) do_gtod.tb_ticks_per_sec = tb_ticks_per_sec; tb_to_xs = divres.result_low; do_gtod.varp->tb_to_xs = tb_to_xs; - systemcfg->tb_ticks_per_sec = tb_ticks_per_sec; - systemcfg->tb_to_xs = tb_to_xs; + vdso_data->tb_ticks_per_sec = tb_ticks_per_sec; + vdso_data->tb_to_xs = tb_to_xs; } else { printk( "Titan recalibrate: FAILED (difference > 4 percent)\n" @@ -483,6 +511,8 @@ void __init smp_space_timers(unsigned int max_cpus) unsigned long offset = tb_ticks_per_jiffy / max_cpus; unsigned long previous_tb = per_cpu(last_jiffy, boot_cpuid); + /* make sure tb > per_cpu(last_jiffy, cpu) for all cpus always */ + previous_tb -= tb_ticks_per_jiffy; for_each_cpu(i) { if (i != boot_cpuid) { previous_tb += offset; @@ -558,10 +588,8 @@ int do_settimeofday(struct timespec *tv) new_xsec += (u64)new_sec * XSEC_PER_SEC - tb_delta_xs; update_gtod(tb_last_jiffy, new_xsec, do_gtod.varp->tb_to_xs); -#ifdef CONFIG_PPC64 - systemcfg->tz_minuteswest = sys_tz.tz_minuteswest; - systemcfg->tz_dsttime = sys_tz.tz_dsttime; -#endif + vdso_data->tz_minuteswest = sys_tz.tz_minuteswest; + vdso_data->tz_dsttime = sys_tz.tz_dsttime; write_sequnlock_irqrestore(&xtime_lock, flags); clock_was_set(); @@ -710,13 +738,12 @@ void __init time_init(void) do_gtod.tb_ticks_per_sec = tb_ticks_per_sec; do_gtod.varp->tb_to_xs = tb_to_xs; do_gtod.tb_to_us = tb_to_us; -#ifdef CONFIG_PPC64 - systemcfg->tb_orig_stamp = tb_last_jiffy; - systemcfg->tb_update_count = 0; - systemcfg->tb_ticks_per_sec = tb_ticks_per_sec; - systemcfg->stamp_xsec = xtime.tv_sec * XSEC_PER_SEC; - systemcfg->tb_to_xs = tb_to_xs; -#endif + + vdso_data->tb_orig_stamp = tb_last_jiffy; + vdso_data->tb_update_count = 0; + vdso_data->tb_ticks_per_sec = tb_ticks_per_sec; + vdso_data->stamp_xsec = xtime.tv_sec * XSEC_PER_SEC; + vdso_data->tb_to_xs = tb_to_xs; time_freq = 0; |