diff options
Diffstat (limited to 'arch/score/kernel/time.c')
| -rw-r--r-- | arch/score/kernel/time.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/arch/score/kernel/time.c b/arch/score/kernel/time.c new file mode 100644 index 00000000000..cd66ba327ca --- /dev/null +++ b/arch/score/kernel/time.c @@ -0,0 +1,99 @@ +/* + * 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> + +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); +} |