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