x86_64: convert to clock events

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>

1 files changed, 13 insertions, 94 deletions

diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c
index d899216e01ca..7781df1d50e3 100644
--- a/arch/x86/kernel/time_64.c
+++ b/arch/x86/kernel/time_64.c
@@ -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_arch_init())
-                hpet_address = 0;
+        if (!hpet_enable())
+                setup_pit_timer();
 
-        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);