100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
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/*
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* arch/score/kernel/time.c
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*
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* Score Processor version.
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*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Chen Liqin <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/clockchips.h>
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#include <linux/interrupt.h>
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#include <asm/scoreregs.h>
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static irqreturn_t timer_interrupt(int irq, void *dev_id)
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{
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struct clock_event_device *evdev = dev_id;
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/* clear timer interrupt flag */
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outl(1, P_TIMER0_CPP_REG);
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evdev->event_handler(evdev);
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return IRQ_HANDLED;
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}
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static struct irqaction timer_irq = {
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.handler = timer_interrupt,
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.flags = IRQF_DISABLED | IRQF_TIMER,
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.name = "timer",
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};
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static int score_timer_set_next_event(unsigned long delta,
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struct clock_event_device *evdev)
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{
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outl((TMR_M_PERIODIC | TMR_IE_ENABLE), P_TIMER0_CTRL);
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outl(delta, P_TIMER0_PRELOAD);
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outl(inl(P_TIMER0_CTRL) | TMR_ENABLE, P_TIMER0_CTRL);
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return 0;
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}
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static void score_timer_set_mode(enum clock_event_mode mode,
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struct clock_event_device *evdev)
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{
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switch (mode) {
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case CLOCK_EVT_MODE_PERIODIC:
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outl((TMR_M_PERIODIC | TMR_IE_ENABLE), P_TIMER0_CTRL);
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outl(SYSTEM_CLOCK/HZ, P_TIMER0_PRELOAD);
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outl(inl(P_TIMER0_CTRL) | TMR_ENABLE, P_TIMER0_CTRL);
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break;
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case CLOCK_EVT_MODE_ONESHOT:
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case CLOCK_EVT_MODE_SHUTDOWN:
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case CLOCK_EVT_MODE_RESUME:
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case CLOCK_EVT_MODE_UNUSED:
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break;
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default:
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BUG();
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}
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}
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static struct clock_event_device score_clockevent = {
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.name = "score_clockevent",
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.features = CLOCK_EVT_FEAT_PERIODIC,
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.shift = 16,
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.set_next_event = score_timer_set_next_event,
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.set_mode = score_timer_set_mode,
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};
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void __init time_init(void)
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{
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timer_irq.dev_id = &score_clockevent;
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setup_irq(IRQ_TIMER , &timer_irq);
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/* setup COMPARE clockevent */
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score_clockevent.mult = div_sc(SYSTEM_CLOCK, NSEC_PER_SEC,
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score_clockevent.shift);
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score_clockevent.max_delta_ns = clockevent_delta2ns((u32)~0,
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&score_clockevent);
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score_clockevent.min_delta_ns = clockevent_delta2ns(50,
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&score_clockevent) + 1;
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score_clockevent.cpumask = cpumask_of(0);
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clockevents_register_device(&score_clockevent);
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}
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