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Linux/arch/score/kernel/time.c

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  1 /*
  2  * arch/score/kernel/time.c
  3  *
  4  * Score Processor version.
  5  *
  6  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
  7  *  Chen Liqin <liqin.chen@sunplusct.com>
  8  *  Lennox Wu <lennox.wu@sunplusct.com>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, see the file COPYING, or write
 22  * to the Free Software Foundation, Inc.,
 23  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 24  */
 25 
 26 #include <linux/clockchips.h>
 27 #include <linux/interrupt.h>
 28 
 29 #include <asm/scoreregs.h>
 30 
 31 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 32 {
 33         struct clock_event_device *evdev = dev_id;
 34 
 35         /* clear timer interrupt flag */
 36         outl(1, P_TIMER0_CPP_REG);
 37         evdev->event_handler(evdev);
 38 
 39         return IRQ_HANDLED;
 40 }
 41 
 42 static struct irqaction timer_irq = {
 43         .handler = timer_interrupt,
 44         .flags = IRQF_TIMER,
 45         .name = "timer",
 46 };
 47 
 48 static int score_timer_set_next_event(unsigned long delta,
 49                 struct clock_event_device *evdev)
 50 {
 51         outl((TMR_M_PERIODIC | TMR_IE_ENABLE), P_TIMER0_CTRL);
 52         outl(delta, P_TIMER0_PRELOAD);
 53         outl(inl(P_TIMER0_CTRL) | TMR_ENABLE, P_TIMER0_CTRL);
 54 
 55         return 0;
 56 }
 57 
 58 static int score_timer_set_periodic(struct clock_event_device *evt)
 59 {
 60         outl((TMR_M_PERIODIC | TMR_IE_ENABLE), P_TIMER0_CTRL);
 61         outl(SYSTEM_CLOCK / HZ, P_TIMER0_PRELOAD);
 62         outl(inl(P_TIMER0_CTRL) | TMR_ENABLE, P_TIMER0_CTRL);
 63         return 0;
 64 }
 65 
 66 static struct clock_event_device score_clockevent = {
 67         .name                   = "score_clockevent",
 68         .features               = CLOCK_EVT_FEAT_PERIODIC,
 69         .shift                  = 16,
 70         .set_next_event         = score_timer_set_next_event,
 71         .set_state_periodic     = score_timer_set_periodic,
 72 };
 73 
 74 void __init time_init(void)
 75 {
 76         timer_irq.dev_id = &score_clockevent;
 77         setup_irq(IRQ_TIMER , &timer_irq);
 78 
 79         /* setup COMPARE clockevent */
 80         score_clockevent.mult = div_sc(SYSTEM_CLOCK, NSEC_PER_SEC,
 81                                         score_clockevent.shift);
 82         score_clockevent.max_delta_ns = clockevent_delta2ns((u32)~0,
 83                                         &score_clockevent);
 84         score_clockevent.max_delta_ticks = (u32)~0;
 85         score_clockevent.min_delta_ns = clockevent_delta2ns(50,
 86                                                 &score_clockevent) + 1;
 87         score_clockevent.min_delta_ticks = 50;
 88         score_clockevent.cpumask = cpumask_of(0);
 89         clockevents_register_device(&score_clockevent);
 90 }
 91 

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