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authorGreg Ungerer <gerg@snapgear.com>2008-02-01 17:40:17 +1000
committerLinus Torvalds <torvalds@linux-foundation.org>2008-02-01 21:02:03 +1100
commit36a90f26aa24c58e5279786340beb9f5bea39361 (patch)
treecf18a97aef95f5b95525526a78bdf27f77db9bcf /arch
parentf6efaf62bbb67ad564862a1131c365c3c55f6242 (diff)
downloadlinux-linaro-36a90f26aa24c58e5279786340beb9f5bea39361.tar.gz
m68knommu: switch 68328 timer to use GENERIC_TIME
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/m68knommu/platform/68328/timers.c56
1 files changed, 43 insertions, 13 deletions
diff --git a/arch/m68knommu/platform/68328/timers.c b/arch/m68knommu/platform/68328/timers.c
index 04cbc661d4b..9159fd05c9a 100644
--- a/arch/m68knommu/platform/68328/timers.c
+++ b/arch/m68knommu/platform/68328/timers.c
@@ -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);
}
/***************************************************************************/