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Subject[patch 2/9] Remove the support for the VXTIME_PMTMR timer mode
VXTIME_PMTMR will be replaced by a more generic "Master Timer"

Signed-off-by: Jiri Bohac <jbohac@suse.cz>

Index: linux-2.6.20-rc5/arch/x86_64/kernel/apic.c
===================================================================
--- linux-2.6.20-rc5.orig/arch/x86_64/kernel/apic.c
+++ linux-2.6.20-rc5/arch/x86_64/kernel/apic.c
@@ -784,16 +784,7 @@ static void setup_APIC_timer(unsigned in
} while (c2 - c1 < 300);
}
__setup_APIC_LVTT(clocks);
- /* Turn off PIT interrupt if we use APIC timer as main timer.
- Only works with the PM timer right now
- TBD fix it for HPET too. */
- if (vxtime.mode == VXTIME_PMTMR &&
- smp_processor_id() == boot_cpu_id &&
- apic_runs_main_timer == 1 &&
- !cpu_isset(boot_cpu_id, timer_interrupt_broadcast_ipi_mask)) {
- stop_timer_interrupt();
- apic_runs_main_timer++;
- }
+
local_irq_restore(flags);
}

Index: linux-2.6.20-rc5/arch/x86_64/kernel/pmtimer.c
===================================================================
--- linux-2.6.20-rc5.orig/arch/x86_64/kernel/pmtimer.c
+++ linux-2.6.20-rc5/arch/x86_64/kernel/pmtimer.c
@@ -29,10 +29,6 @@
* in arch/i386/kernel/acpi/boot.c */
u32 pmtmr_ioport __read_mostly;

-/* value of the Power timer at last timer interrupt */
-static u32 offset_delay;
-static u32 last_pmtmr_tick;
-
#define ACPI_PM_MASK 0xFFFFFF /* limit it to 24 bits */

static inline u32 cyc2us(u32 cycles)
@@ -48,38 +44,6 @@ static inline u32 cyc2us(u32 cycles)
return (cycles >> 10);
}

-int pmtimer_mark_offset(void)
-{
- static int first_run = 1;
- unsigned long tsc;
- u32 lost;
-
- u32 tick = inl(pmtmr_ioport);
- u32 delta;
-
- delta = cyc2us((tick - last_pmtmr_tick) & ACPI_PM_MASK);
-
- last_pmtmr_tick = tick;
- monotonic_base += delta * NSEC_PER_USEC;
-
- delta += offset_delay;
-
- lost = delta / (USEC_PER_SEC / HZ);
- offset_delay = delta % (USEC_PER_SEC / HZ);
-
- rdtscll(tsc);
- vxtime.last_tsc = tsc - offset_delay * (u64)cpu_khz / 1000;
-
- /* don't calculate delay for first run,
- or if we've got less then a tick */
- if (first_run || (lost < 1)) {
- first_run = 0;
- offset_delay = 0;
- }
-
- return lost - 1;
-}
-
static unsigned pmtimer_wait_tick(void)
{
u32 a, b;
@@ -100,28 +64,3 @@ void pmtimer_wait(unsigned us)
cpu_relax();
} while (cyc2us(b - a) < us);
}
-
-void pmtimer_resume(void)
-{
- last_pmtmr_tick = inl(pmtmr_ioport);
-}
-
-unsigned int do_gettimeoffset_pm(void)
-{
- u32 now, offset, delta = 0;
-
- offset = last_pmtmr_tick;
- now = inl(pmtmr_ioport);
- delta = (now - offset) & ACPI_PM_MASK;
-
- return offset_delay + cyc2us(delta);
-}
-
-
-static int __init nopmtimer_setup(char *s)
-{
- pmtmr_ioport = 0;
- return 1;
-}
-
-__setup("nopmtimer", nopmtimer_setup);
Index: linux-2.6.20-rc5/arch/x86_64/kernel/time.c
===================================================================
--- linux-2.6.20-rc5.orig/arch/x86_64/kernel/time.c
+++ linux-2.6.20-rc5/arch/x86_64/kernel/time.c
@@ -364,13 +364,6 @@ void main_timer_handler(void)
*/
offset = hpet_readl(HPET_T0_CMP) - hpet_tick;
delay = hpet_readl(HPET_COUNTER) - offset;
- } else if (!pmtmr_ioport) {
- spin_lock(&i8253_lock);
- outb_p(0x00, 0x43);
- delay = inb_p(0x40);
- delay |= inb(0x40) << 8;
- spin_unlock(&i8253_lock);
- delay = LATCH - 1 - delay;
}

tsc = get_cycles_sync();
@@ -384,10 +377,6 @@ void main_timer_handler(void)
(offset - vxtime.last) * NSEC_PER_TICK / hpet_tick;

vxtime.last = offset;
-#ifdef CONFIG_X86_PM_TIMER
- } else if (vxtime.mode == VXTIME_PMTMR) {
- lost = pmtimer_mark_offset();
-#endif
} else {
offset = (((tsc - vxtime.last_tsc) *
vxtime.tsc_quot) >> US_SCALE) - USEC_PER_TICK;
@@ -914,13 +903,6 @@ void __init time_init(void)
tick_nsec = TICK_NSEC_HPET;
cpu_khz = hpet_calibrate_tsc();
timename = "HPET";
-#ifdef CONFIG_X86_PM_TIMER
- } else if (pmtmr_ioport && !vxtime.hpet_address) {
- vxtime_hz = PM_TIMER_FREQUENCY;
- timename = "PM";
- pit_init();
- cpu_khz = pit_calibrate_tsc();
-#endif
} else {
pit_init();
cpu_khz = pit_calibrate_tsc();
@@ -987,16 +969,6 @@ void time_init_gtod(void)
vxtime.last = hpet_readl(HPET_COUNTER);
vxtime.mode = VXTIME_HPET;
do_gettimeoffset = do_gettimeoffset_hpet;
-#ifdef CONFIG_X86_PM_TIMER
- /* Using PM for gettimeofday is quite slow, but we have no other
- choice because the TSC is too unreliable on some systems. */
- } else if (pmtmr_ioport && !vxtime.hpet_address && notsc) {
- timetype = "PM";
- do_gettimeoffset = do_gettimeoffset_pm;
- vxtime.mode = VXTIME_PMTMR;
- sysctl_vsyscall = 0;
- printk(KERN_INFO "Disabling vsyscall due to use of PM timer\n");
-#endif
} else {
timetype = hpet_use_timer ? "HPET/TSC" : "PIT/TSC";
vxtime.mode = VXTIME_TSC;
@@ -1064,10 +1036,6 @@ static int timer_resume(struct sys_devic
vxtime.last = hpet_readl(HPET_T0_CMP) - hpet_tick;
else
vxtime.last = hpet_readl(HPET_COUNTER);
-#ifdef CONFIG_X86_PM_TIMER
- } else if (vxtime.mode == VXTIME_PMTMR) {
- pmtimer_resume();
-#endif
} else
vxtime.last_tsc = get_cycles_sync();
write_sequnlock_irqrestore(&xtime_lock,flags);
Index: linux-2.6.20-rc5/include/asm-x86_64/vsyscall.h
===================================================================
--- linux-2.6.20-rc5.orig/include/asm-x86_64/vsyscall.h
+++ linux-2.6.20-rc5/include/asm-x86_64/vsyscall.h
@@ -26,7 +26,6 @@ enum vsyscall_num {

#define VXTIME_TSC 1
#define VXTIME_HPET 2
-#define VXTIME_PMTMR 3

#define VGETCPU_RDTSCP 1
#define VGETCPU_LSL 2
--
-
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