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x86_64: convert to clock events

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Finally switch to the clockevents code. Share code with i386 for
hpet and PIT.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
This commit is contained in:
Thomas Gleixner
2007-10-12 23:04:07 +02:00
committed by Thomas Gleixner
parent ba7eda4c60
commit b8ce335906
9 changed files with 158 additions and 299 deletions
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107
arch/x86/kernel/time_64.c
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@@ -28,6 +28,8 @@
#include <linux/cpu.h>
#include <linux/kallsyms.h>
#include <linux/acpi.h>
#include <linux/clockchips.h>
#ifdef CONFIG_ACPI
#include <acpi/achware.h> /* for PM timer frequency */
#include <acpi/acpi_bus.h>
@@ -46,12 +48,8 @@
#include <asm/nmi.h>
#include <asm/vgtod.h>
static char *timename = NULL;
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);
DEFINE_SPINLOCK(i8253_lock);
EXPORT_SYMBOL(i8253_lock);
volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES;
@@ -194,6 +192,13 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
static irqreturn_t timer_event_interrupt(int irq, void *dev_id)
{
global_clock_event->event_handler(global_clock_event);
return IRQ_HANDLED;
}
unsigned long read_persistent_clock(void)
{
unsigned int year, mon, day, hour, min, sec;
@@ -291,42 +296,8 @@ static unsigned int __init tsc_calibrate_cpu_khz(void)
return pmc_now * tsc_khz / (tsc_now - tsc_start);
}
static void __pit_init(int val, u8 mode)
{
unsigned long flags;
spin_lock_irqsave(&i8253_lock, flags);
outb_p(mode, PIT_MODE);
outb_p(val & 0xff, PIT_CH0); /* LSB */
outb_p(val >> 8, PIT_CH0); /* MSB */
spin_unlock_irqrestore(&i8253_lock, flags);
}
void __init pit_init(void)
{
__pit_init(LATCH, 0x34); /* binary, mode 2, LSB/MSB, ch 0 */
}
void pit_stop_interrupt(void)
{
__pit_init(0, 0x30); /* mode 0 */
}
void stop_timer_interrupt(void)
{
char *name;
if (hpet_address) {
name = "HPET";
hpet_timer_stop_set_go(0);
} else {
name = "PIT";
pit_stop_interrupt();
}
printk(KERN_INFO "timer: %s interrupt stopped.\n", name);
}
static struct irqaction irq0 = {
.handler = timer_interrupt,
.handler = timer_event_interrupt,
.flags = IRQF_DISABLED | IRQF_IRQPOLL | IRQF_NOBALANCING,
.mask = CPU_MASK_NONE,
.name = "timer"
@@ -334,20 +305,10 @@ static struct irqaction irq0 = {
void __init time_init(void)
{
if (nohpet)
hpet_address = 0;
if (!hpet_enable())
setup_pit_timer();
if (hpet_arch_init())
hpet_address = 0;
if (hpet_use_timer) {
/* set tick_nsec to use the proper rate for HPET */
tick_nsec = TICK_NSEC_HPET;
timename = "HPET";
} else {
pit_init();
timename = "PIT";
}
setup_irq(0, &irq0);
tsc_calibrate();
@@ -369,46 +330,4 @@ void __init time_init(void)
printk(KERN_INFO "time.c: Detected %d.%03d MHz processor.\n",
cpu_khz / 1000, cpu_khz % 1000);
init_tsc_clocksource();
setup_irq(0, &irq0);
}
/*
* sysfs support for the timer.
*/
static int timer_suspend(struct sys_device *dev, pm_message_t state)
{
return 0;
}
static int timer_resume(struct sys_device *dev)
{
if (hpet_address)
hpet_reenable();
else
i8254_timer_resume();
return 0;
}
static struct sysdev_class timer_sysclass = {
.resume = timer_resume,
.suspend = timer_suspend,
set_kset_name("timer"),
};
/* XXX this sysfs stuff should probably go elsewhere later -john */
static struct sys_device device_timer = {
.id = 0,
.cls = &timer_sysclass,
};
static int time_init_device(void)
{
int error = sysdev_class_register(&timer_sysclass);
if (!error)
error = sysdev_register(&device_timer);
return error;
}
device_initcall(time_init_device);