#include "mach_timer.h"
#include <asm/hpet.h>
-static unsigned long 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 */
eax = hpet_readl(HPET_COUNTER);
eax -= hpet_last; /* hpet delta */
-
+ eax = min(hpet_tick, eax);
/*
* Time offset = (hpet delta) * ( usecs per HPET clock )
* = (hpet delta) * ( usecs per tick / HPET clocks per tick)
last_offset = ((unsigned long long)last_tsc_high<<32)|last_tsc_low;
rdtsc(last_tsc_low, last_tsc_high);
- offset = hpet_readl(HPET_T0_CMP) - hpet_tick;
- if (unlikely(((offset - hpet_last) > hpet_tick) && (hpet_last != 0))) {
- int lost_ticks = (offset - hpet_last) / hpet_tick;
+ if (hpet_use_timer)
+ offset = hpet_readl(HPET_T0_CMP) - hpet_tick;
+ else
+ offset = hpet_readl(HPET_COUNTER);
+ if (unlikely(((offset - hpet_last) >= (2*hpet_tick)) && (hpet_last != 0))) {
+ int lost_ticks = ((offset - hpet_last) / hpet_tick) - 1;
jiffies_64 += lost_ticks;
}
hpet_last = offset;
} while ((hpet_end - hpet_start) < (loops));
}
+static struct timer_opts timer_hpet;
+
static int __init init_hpet(char* override)
{
unsigned long result, remain;
{ unsigned long eax=0, edx=1000;
ASM_DIV64_REG(cpu_khz, edx, tsc_quotient,
eax, edx);
- printk("Detected %lu.%03lu MHz processor.\n",
+ printk("Detected %u.%03u MHz processor.\n",
cpu_khz / 1000, cpu_khz % 1000);
}
set_cyc2ns_scale(cpu_khz/1000);
}
+ /* set this only when cpu_has_tsc */
+ timer_hpet.read_timer = read_timer_tsc;
}
/*
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 */
-static struct timer_opts timer_hpet = {
+static struct timer_opts timer_hpet __read_mostly = {
.name = "hpet",
.mark_offset = mark_offset_hpet,
.get_offset = get_offset_hpet,
.monotonic_clock = monotonic_clock_hpet,
.delay = delay_hpet,
+ .resume = hpet_resume,
};
struct init_timer_opts __initdata timer_hpet_init = {