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m68knommu: switch 68328 timer to use GENERIC_TIME

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Switch the 68328 CPU timer code to using GENERIC_TIME.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Greg Ungerer 2008-02-01 17:40:17 +10:00 • committed by Linus Torvalds
parent f6efaf62bb
commit 36a90f26aa
1 changed files with 43 additions and 13 deletions
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56
arch/m68knommu/platform/68328/timers.c
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@ -19,6 +19,7 @@
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/irq.h> #include <linux/irq.h>
#include <linux/clocksource.h>
#include <asm/setup.h> #include <asm/setup.h>
#include <asm/system.h> #include <asm/system.h>
#include <asm/pgtable.h> #include <asm/pgtable.h>
@ -51,6 +52,19 @@
#define TICKS_PER_JIFFY 10 #define TICKS_PER_JIFFY 10
#endif #endif
static u32 m68328_tick_cnt;
/***************************************************************************/
static irqreturn_t hw_tick(int irq, void *dummy)
{
/* Reset Timer1 */
TSTAT &= 0;
m68328_tick_cnt += TICKS_PER_JIFFY;
return arch_timer_interrupt(irq, dummy);
}
/***************************************************************************/ /***************************************************************************/
static irqreturn_t hw_tick(int irq, void *dummy) static irqreturn_t hw_tick(int irq, void *dummy)
@ -69,6 +83,33 @@ static struct irqaction m68328_timer_irq = {
.handler = hw_tick, .handler = hw_tick,
}; };
/***************************************************************************/
static cycle_t m68328_read_clk(void)
{
unsigned long flags;
u32 cycles;
local_irq_save(flags);
cycles = m68328_tick_cnt + TCN;
local_irq_restore(flags);
return cycles;
}
/***************************************************************************/
static struct clocksource m68328_clk = {
.name = "timer",
.rating = 250,
.read = m68328_read_clk,
.shift = 20,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
/***************************************************************************/
void hw_timer_init(void) void hw_timer_init(void)
{ {
/* disable timer 1 */ /* disable timer 1 */
@ -84,19 +125,8 @@ void hw_timer_init(void)
/* Enable timer 1 */ /* Enable timer 1 */
TCTL |= TCTL_TEN; TCTL |= TCTL_TEN;
} m68328_clk.mult = clocksource_hz2mult(TICKS_PER_JIFFY*HZ, m68328_clk.shift);
clocksource_register(&m68328_clk);
/***************************************************************************/
unsigned long hw_timer_offset(void)
{
unsigned long ticks = TCN, offset = 0;
/* check for pending interrupt */
if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM)))
offset = 1000000 / HZ;
ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY;
return ticks + offset;
} }
/***************************************************************************/ /***************************************************************************/