From: Greg Ungerer <gerg@snapgear.com>
To: torvalds@linux-foundation.org
Cc: gerg@uclinux.org, linux-kernel@vger.kernel.org
Subject: [M68KNOMMU 01/07]: switch 68328 timer to use GENERIC_TIME
Date: Fri, 1 Feb 2008 17:40:17 +1000 [thread overview]
Message-ID: <200802010740.m117eHNS022774@goober> (raw)
Switch the 68328 CPU timer code to using GENERIC_TIME.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
---
diff -Naurp linux-2.6.24/arch/m68knommu/platform/68328/timers.c linux-2.6.24-uc0/arch/m68knommu/platform/68328/timers.c
--- linux-2.6.24/arch/m68knommu/platform/68328/timers.c 2008-01-25 08:58:37.000000000 +1000
+++ linux-2.6.24-uc0/arch/m68knommu/platform/68328/timers.c 2008-01-25 14:32:37.000000000 +1000
@@ -19,6 +19,7 @@
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
+#include <linux/clocksource.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/pgtable.h>
@@ -51,6 +52,19 @@
#define TICKS_PER_JIFFY 10
#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)
@@ -69,6 +83,33 @@ static struct irqaction m68328_timer_irq
.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)
{
/* disable timer 1 */
@@ -84,19 +125,8 @@ void hw_timer_init(void)
/* Enable timer 1 */
TCTL |= TCTL_TEN;
-}
-
-/***************************************************************************/
-
-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;
+ m68328_clk.mult = clocksource_hz2mult(TICKS_PER_JIFFY*HZ, m68328_clk.shift);
+ clocksource_register(&m68328_clk);
}
/***************************************************************************/
reply other threads:[~2008-02-01 7:48 UTC|newest]
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