Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 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 | |
Arnd Bergmann | bddc605 | 2009-06-27 15:12:16 +0200 | [diff] [blame] | 31 | static irqreturn_t timer_interrupt(int irq, void *dev_id) |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 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_DISABLED | 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 void score_timer_set_mode(enum clock_event_mode mode, |
| 59 | struct clock_event_device *evdev) |
| 60 | { |
| 61 | switch (mode) { |
| 62 | case CLOCK_EVT_MODE_PERIODIC: |
| 63 | outl((TMR_M_PERIODIC | TMR_IE_ENABLE), P_TIMER0_CTRL); |
| 64 | outl(SYSTEM_CLOCK/HZ, P_TIMER0_PRELOAD); |
| 65 | outl(inl(P_TIMER0_CTRL) | TMR_ENABLE, P_TIMER0_CTRL); |
| 66 | break; |
| 67 | case CLOCK_EVT_MODE_ONESHOT: |
| 68 | case CLOCK_EVT_MODE_SHUTDOWN: |
| 69 | case CLOCK_EVT_MODE_RESUME: |
| 70 | case CLOCK_EVT_MODE_UNUSED: |
| 71 | break; |
| 72 | default: |
| 73 | BUG(); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | static struct clock_event_device score_clockevent = { |
| 78 | .name = "score_clockevent", |
| 79 | .features = CLOCK_EVT_FEAT_PERIODIC, |
| 80 | .shift = 16, |
| 81 | .set_next_event = score_timer_set_next_event, |
| 82 | .set_mode = score_timer_set_mode, |
| 83 | }; |
| 84 | |
| 85 | void __init time_init(void) |
| 86 | { |
| 87 | timer_irq.dev_id = &score_clockevent; |
| 88 | setup_irq(IRQ_TIMER , &timer_irq); |
| 89 | |
| 90 | /* setup COMPARE clockevent */ |
| 91 | score_clockevent.mult = div_sc(SYSTEM_CLOCK, NSEC_PER_SEC, |
| 92 | score_clockevent.shift); |
| 93 | score_clockevent.max_delta_ns = clockevent_delta2ns((u32)~0, |
| 94 | &score_clockevent); |
| 95 | score_clockevent.min_delta_ns = clockevent_delta2ns(50, |
| 96 | &score_clockevent) + 1; |
| 97 | score_clockevent.cpumask = cpumask_of(0); |
| 98 | clockevents_register_device(&score_clockevent); |
| 99 | } |