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Subject[tip:timers/cleanup] mips: Use common i8253 clockevent
Commit-ID:  594fa4ac22954c9cb8d65040c5c3676778b08e1d
Gitweb: http://git.kernel.org/tip/594fa4ac22954c9cb8d65040c5c3676778b08e1d
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Thu, 9 Jun 2011 13:08:27 +0000
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Fri, 24 Jun 2011 16:22:55 +0200
mips: 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/20110609130622.133068765@linutronix.de
---
arch/mips/Kconfig | 1 +
arch/mips/kernel/i8253.c | 97 +---------------------------------------------
2 files changed, 3 insertions(+), 95 deletions(-)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 45f7aac..6cb60ad 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2391,6 +2391,7 @@ config MMU
config I8253
bool
select CLKSRC_I8253
+ select CLKEVT_I8253
select MIPS_EXTERNAL_TIMER

config ZONE_DMA32
diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c
index 3d2ff57..8d95fe4f 100644
--- a/arch/mips/kernel/i8253.c
+++ b/arch/mips/kernel/i8253.c
@@ -4,92 +4,15 @@
*/
#include <linux/clockchips.h>
#include <linux/i8253.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/smp.h>
-#include <linux/spinlock.h>
#include <linux/irq.h>

-#include <asm/delay.h>
-#include <asm/io.h>
#include <asm/time.h>

-/*
- * 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_p(0x34, PIT_MODE);
- outb_p(LATCH & 0xff , PIT_CH0); /* LSB */
- outb(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_p(0x30, PIT_MODE);
- outb_p(0, PIT_CH0);
- outb_p(0, PIT_CH0);
- }
- break;
-
- case CLOCK_EVT_MODE_ONESHOT:
- /* One shot setup */
- outb_p(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_p(delta & 0xff , PIT_CH0); /* LSB */
- outb(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 capabilites 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_clockevent = {
- .name = "pit",
- .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
- .set_mode = init_pit_timer,
- .set_next_event = pit_next_event,
- .irq = 0,
-};
-
static irqreturn_t timer_interrupt(int irq, void *dev_id)
{
- pit_clockevent.event_handler(&pit_clockevent);
+ i8253_clockevent.event_handler(&pit_clockevent);

return IRQ_HANDLED;
}
@@ -100,25 +23,9 @@ static struct irqaction irq0 = {
.name = "timer"
};

-/*
- * 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)
{
- struct clock_event_device *cd = &pit_clockevent;
- unsigned int cpu = smp_processor_id();
-
- /*
- * Start pit with the boot cpu mask and make it global after the
- * IO_APIC has been initialized.
- */
- cd->cpumask = cpumask_of(cpu);
- clockevent_set_clock(cd, CLOCK_TICK_RATE);
- cd->max_delta_ns = clockevent_delta2ns(0x7FFF, cd);
- cd->min_delta_ns = clockevent_delta2ns(0xF, cd);
- clockevents_register_device(cd);
-
+ clockevent_i8253_init(true);
setup_irq(0, &irq0);
}


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