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author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-04-14 17:36:28 +0400 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-04-14 17:37:27 +0400 |
commit | b6112ccbff5ec580d46b584ecc3c3a773b830da2 (patch) | |
tree | 71553f09a2acfedec85f3c29a1c65e0a257001fb /arch/s390/kernel/time.c | |
parent | 5b409ed17bb32c8316b1f456466c70529454573a (diff) | |
download | linux-b6112ccbff5ec580d46b584ecc3c3a773b830da2.tar.xz |
[S390] add read_persistent_clock
Add a read_persistent_clock function that does not just return 0.
Since timekeeping_init calls the function before time_init has been
called move reset_tod_clock to early.c to make sure that the TOD
clock is running when read_persistent_clock is invoked.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/time.c')
-rw-r--r-- | arch/s390/kernel/time.c | 28 |
1 files changed, 9 insertions, 19 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index 05f93e77870b..369ff02c4ab2 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -52,9 +52,6 @@ #define USECS_PER_JIFFY ((unsigned long) 1000000/HZ) #define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12) -/* The value of the TOD clock for 1.1.1970. */ -#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL - /* * Create a small time difference between the timer interrupts * on the different cpus to avoid lock contention. @@ -63,9 +60,10 @@ #define TICK_SIZE tick +u64 sched_clock_base_cc = -1; /* Force to data section. */ + static ext_int_info_t ext_int_info_cc; static ext_int_info_t ext_int_etr_cc; -static u64 sched_clock_base_cc; static DEFINE_PER_CPU(struct clock_event_device, comparators); @@ -195,22 +193,12 @@ static void timing_alert_interrupt(__u16 code) static void etr_reset(void); static void stp_reset(void); -/* - * Get the TOD clock running. - */ -static u64 __init reset_tod_clock(void) +unsigned long read_persistent_clock(void) { - u64 time; + struct timespec ts; - etr_reset(); - stp_reset(); - if (store_clock(&time) == 0) - return time; - /* TOD clock not running. Set the clock to Unix Epoch. */ - if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0) - panic("TOD clock not operational."); - - return TOD_UNIX_EPOCH; + tod_to_timeval(get_clock() - TOD_UNIX_EPOCH, &ts); + return ts.tv_sec; } static cycle_t read_tod_clock(void) @@ -265,7 +253,9 @@ void update_vsyscall_tz(void) */ void __init time_init(void) { - sched_clock_base_cc = reset_tod_clock(); + /* Reset time synchronization interfaces. */ + etr_reset(); + stp_reset(); /* set xtime */ tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, &xtime); |