void __init setup_system_timer0(void) { /* Power down the core timer, just to play safe. */ bfin_write_TCNTL(0); disable_gptimers(TIMER0bit); set_gptimer_status(0, TIMER_STATUS_TRUN0); while (get_gptimer_status(0) & TIMER_STATUS_TRUN0) udelay(10); set_gptimer_config(0, 0x59); /* IRQ enable, periodic, PWM_OUT, SCLKed, OUT PAD disabled */ set_gptimer_period(TIMER0_id, get_sclk() / HZ); set_gptimer_pwidth(TIMER0_id, 1); SSYNC(); enable_gptimers(TIMER0bit); }
irqreturn_t timer_interrupt(int irq, void *dummy) { /* last time the cmos clock got updated */ static long last_rtc_update; write_seqlock(&xtime_lock); #if defined(CONFIG_TICK_SOURCE_SYSTMR0) && !defined(CONFIG_IPIPE) /* * TIMIL0 is latched in __ipipe_grab_irq() when the I-Pipe is * enabled. */ if (get_gptimer_status(0) & TIMER_STATUS_TIMIL0) { #endif do_timer(1); /* * If we have an externally synchronized Linux clock, then update * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be * called as close as possible to 500 ms before the new second starts. */ if (ntp_synced() && xtime.tv_sec > last_rtc_update + 660 && (xtime.tv_nsec / NSEC_PER_USEC) >= 500000 - ((unsigned)TICK_SIZE) / 2 && (xtime.tv_nsec / NSEC_PER_USEC) <= 500000 + ((unsigned)TICK_SIZE) / 2) { if (set_rtc_mmss(xtime.tv_sec) == 0) last_rtc_update = xtime.tv_sec; else /* Do it again in 60s. */ last_rtc_update = xtime.tv_sec - 600; } #if defined(CONFIG_TICK_SOURCE_SYSTMR0) && !defined(CONFIG_IPIPE) set_gptimer_status(0, TIMER_STATUS_TIMIL0); } #endif write_sequnlock(&xtime_lock); #ifdef CONFIG_IPIPE update_root_process_times(get_irq_regs()); #else update_process_times(user_mode(get_irq_regs())); #endif profile_tick(CPU_PROFILING); return IRQ_HANDLED; }
static void bfin_timer_ack(void) { set_gptimer_status(TIMER_GROUP1, TIMER_STATUS_TIMIL0); }