diff options
Diffstat (limited to 'arch/i386/kernel/timers/timer_hpet.c')
| -rw-r--r-- | arch/i386/kernel/timers/timer_hpet.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/arch/i386/kernel/timers/timer_hpet.c b/arch/i386/kernel/timers/timer_hpet.c index ef8dac5dd33..d973a8b681f 100644 --- a/arch/i386/kernel/timers/timer_hpet.c +++ b/arch/i386/kernel/timers/timer_hpet.c @@ -18,8 +18,8 @@ #include "mach_timer.h" #include <asm/hpet.h> -static unsigned long __read_mostly hpet_usec_quotient; /* convert hpet clks to usec */ -static unsigned long tsc_hpet_quotient; /* convert tsc to hpet clks */ +static unsigned long hpet_usec_quotient __read_mostly; /* convert hpet clks to usec */ +static unsigned long tsc_hpet_quotient __read_mostly; /* convert tsc to hpet clks */ static unsigned long hpet_last; /* hpet counter value at last tick*/ static unsigned long last_tsc_low; /* lsb 32 bits of Time Stamp Counter */ static unsigned long last_tsc_high; /* msb 32 bits of Time Stamp Counter */ @@ -136,6 +136,8 @@ static void delay_hpet(unsigned long loops) } while ((hpet_end - hpet_start) < (loops)); } +static struct timer_opts timer_hpet; + static int __init init_hpet(char* override) { unsigned long result, remain; @@ -163,6 +165,8 @@ static int __init init_hpet(char* override) } set_cyc2ns_scale(cpu_khz/1000); } + /* set this only when cpu_has_tsc */ + timer_hpet.read_timer = read_timer_tsc; } /* @@ -177,6 +181,19 @@ static int __init init_hpet(char* override) return 0; } +static int hpet_resume(void) +{ + write_seqlock(&monotonic_lock); + /* Assume this is the last mark offset time */ + rdtsc(last_tsc_low, last_tsc_high); + + if (hpet_use_timer) + hpet_last = hpet_readl(HPET_T0_CMP) - hpet_tick; + else + hpet_last = hpet_readl(HPET_COUNTER); + write_sequnlock(&monotonic_lock); + return 0; +} /************************************************************/ /* tsc timer_opts struct */ @@ -186,7 +203,7 @@ static struct timer_opts timer_hpet __read_mostly = { .get_offset = get_offset_hpet, .monotonic_clock = monotonic_clock_hpet, .delay = delay_hpet, - .read_timer = read_timer_tsc, + .resume = hpet_resume, }; struct init_timer_opts __initdata timer_hpet_init = { |