x86: Use common i8253 clockevent

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20110609130622.026152527@linutronix.de

2 files changed, 4 insertions, 91 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2dd95b55567b..26a14b4bdd14 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -71,7 +71,7 @@ config X86
         select IRQ_FORCED_THREADING
         select USE_GENERIC_SMP_HELPERS if SMP
         select HAVE_BPF_JIT if (X86_64 && NET)
-        select I8253_LOCK
+        select CLKEVT_I8253
 
 config INSTRUCTION_DECODER
         def_bool (KPROBES || PERF_EVENTS)
diff --git a/arch/x86/kernel/i8253.c b/arch/x86/kernel/i8253.c
index 5783e6de2079..f2b96de3c7c1 100644
--- a/arch/x86/kernel/i8253.c
+++ b/arch/x86/kernel/i8253.c
@@ -3,15 +3,9 @@
  *
  */
 #include <linux/clockchips.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/jiffies.h>
 #include <linux/module.h>
 #include <linux/timex.h>
-#include <linux/delay.h>
 #include <linux/i8253.h>
-#include <linux/init.h>
-#include <linux/io.h>
 
 #include <asm/hpet.h>
 #include <asm/time.h>
@@ -23,91 +17,10 @@
  */
 struct clock_event_device *global_clock_event;
 
-/*
- * Initialize the PIT timer.
- *
- * This is also called after resume to bring the PIT into operation again.
- */
-static void init_pit_timer(enum clock_event_mode mode,
-                           struct clock_event_device *evt)
-{
-        raw_spin_lock(&i8253_lock);
-
-        switch (mode) {
-        case CLOCK_EVT_MODE_PERIODIC:
-                /* binary, mode 2, LSB/MSB, ch 0 */
-                outb_pit(0x34, PIT_MODE);
-                outb_pit(LATCH & 0xff , PIT_CH0);       /* LSB */
-                outb_pit(LATCH >> 8 , PIT_CH0);         /* MSB */
-                break;
-
-        case CLOCK_EVT_MODE_SHUTDOWN:
-        case CLOCK_EVT_MODE_UNUSED:
-                if (evt->mode == CLOCK_EVT_MODE_PERIODIC ||
-                    evt->mode == CLOCK_EVT_MODE_ONESHOT) {
-                        outb_pit(0x30, PIT_MODE);
-                        outb_pit(0, PIT_CH0);
-                        outb_pit(0, PIT_CH0);
-                }
-                break;
-
-        case CLOCK_EVT_MODE_ONESHOT:
-                /* One shot setup */
-                outb_pit(0x38, PIT_MODE);
-                break;
-
-        case CLOCK_EVT_MODE_RESUME:
-                /* Nothing to do here */
-                break;
-        }
-        raw_spin_unlock(&i8253_lock);
-}
-
-/*
- * Program the next event in oneshot mode
- *
- * Delta is given in PIT ticks
- */
-static int pit_next_event(unsigned long delta, struct clock_event_device *evt)
-{
-        raw_spin_lock(&i8253_lock);
-        outb_pit(delta & 0xff , PIT_CH0);       /* LSB */
-        outb_pit(delta >> 8 , PIT_CH0);         /* MSB */
-        raw_spin_unlock(&i8253_lock);
-
-        return 0;
-}
-
-/*
- * On UP the PIT can serve all of the possible timer functions. On SMP systems
- * it can be solely used for the global tick.
- *
- * The profiling and update capabilities are switched off once the local apic is
- * registered. This mechanism replaces the previous #ifdef LOCAL_APIC -
- * !using_apic_timer decisions in do_timer_interrupt_hook()
- */
-static struct clock_event_device pit_ce = {
-        .name           = "pit",
-        .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-        .set_mode       = init_pit_timer,
-        .set_next_event = pit_next_event,
-        .irq            = 0,
-};
-
-/*
- * Initialize the conversion factor and the min/max deltas of the clock event
- * structure and register the clock event source with the framework.
- */
 void __init setup_pit_timer(void)
 {
-        /*
-         * Start pit with the boot cpu mask and make it global after the
-         * IO_APIC has been initialized.
-         */
-        pit_ce.cpumask = cpumask_of(smp_processor_id());
-
-        clockevents_config_and_register(&pit_ce, CLOCK_TICK_RATE, 0xF, 0x7FFF);
-        global_clock_event = &pit_ce;
+        clockevent_i8253_init(true);
+        global_clock_event = &i8253_clockevent;
 }
 
 #ifndef CONFIG_X86_64
@@ -121,7 +34,7 @@ static int __init init_pit_clocksource(void)
           * - when local APIC timer is active (PIT is switched off)
           */
         if (num_possible_cpus() > 1 || is_hpet_enabled() ||
-            pit_ce.mode != CLOCK_EVT_MODE_PERIODIC)
+            i8253_clockevent.mode != CLOCK_EVT_MODE_PERIODIC)
                 return 0;
 
         return clocksource_i8253_init();