#include <asm/mach/irq.h>
#include <asm/mach/time.h>
+#undef IOP331_TIME_SYNC
+
+static unsigned long iop331_latch;
+
static inline unsigned long get_elapsed(void)
{
- return LATCH - *IOP331_TU_TCR0;
+ return iop331_latch - *IOP331_TU_TCR0;
}
static unsigned long iop331_gettimeoffset(void)
asm volatile("mrc p6, 0, %0, c6, c1, 0" : "=r" (tisr2));
if(tisr1 & 1)
- elapsed += LATCH;
+ elapsed += iop331_latch;
else if (tisr2 & 1)
- elapsed = LATCH + get_elapsed();
+ elapsed = iop331_latch + get_elapsed();
/*
* Now convert them to usec.
*/
- usec = (unsigned long)(elapsed * (tick_nsec / 1000)) / LATCH;
+ usec = (unsigned long)(elapsed * (tick_nsec / 1000)) / iop331_latch;
return usec;
}
iop331_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
u32 tisr;
-
- write_seqlock(&xtime_lock);
+#ifdef IOP331_TIME_SYNC
+ u32 passed;
+#define TM_THRESH (iop331_latch*2)
+#endif
asm volatile("mrc p6, 0, %0, c6, c1, 0" : "=r" (tisr));
+
tisr |= 1;
+
asm volatile("mcr p6, 0, %0, c6, c1, 0" : : "r" (tisr));
- timer_tick(regs);
+#ifdef IOP331_TIME_SYNC
+ passed = 0xffffffff - *IOP331_TU_TCR1;
+
+ do
+ {
+ do_timer(regs);
+ if(passed < TM_THRESH)
+ break;
+ if(passed > iop331_latch)
+ passed -= iop331_latch;
+ else
+ passed = 0;
+ } while(1);
+
+ asm volatile("mcr p6, 0, %0, c3, c1, 0" : : "r" (0xffffffff));
+#else
+ do_timer(regs);
+#endif
- write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}
.flags = SA_INTERRUPT
};
-static void __init iop331_timer_init(void)
+extern int setup_arm_irq(int, struct irqaction*);
+
+void __init iop331_init_time(void)
{
u32 timer_ctl;
+ iop331_latch = (CLOCK_TICK_RATE + HZ / 2) / HZ;
+ gettimeoffset = iop331_gettimeoffset;
setup_irq(IRQ_IOP331_TIMER0, &iop331_timer_irq);
timer_ctl = IOP331_TMR_EN | IOP331_TMR_PRIVILEGED | IOP331_TMR_RELOAD |
IOP331_TMR_RATIO_1_1;
- asm volatile("mcr p6, 0, %0, c4, c1, 0" : : "r" (LATCH));
+ asm volatile("mcr p6, 0, %0, c4, c1, 0" : : "r" (iop331_latch));
asm volatile("mcr p6, 0, %0, c0, c1, 0" : : "r" (timer_ctl));
+#ifdef IOP331_TIME_SYNC
+ /* Setup second timer */
+ /* setup counter */
+ timer_ctl = IOP331_TMR_EN | IOP331_TMR_PRIVILEGED |
+ IOP331_TMR_RATIO_1_1;
+ asm volatile("mcr p6, 0, %0, c3, c1, 0" : : "r" (0xffffffff));
+ /* setup control */
+ asm volatile("mcr p6, 0, %0, c1, c1, 0" : : "r" (timer_ctl));
+#endif
}
-struct sys_timer iop331_timer = {
- .init = iop331_timer_init,
- .offset = iop331_gettimeoffset,
-};
+