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-/*
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- * arch/arm/mach-ns9xxx/time-ns9360.c
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- *
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- * Copyright (C) 2006,2007 by Digi International Inc.
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- * All rights reserved.
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published by
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- * the Free Software Foundation.
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- */
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-#include <linux/jiffies.h>
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-#include <linux/interrupt.h>
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-#include <linux/irq.h>
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-#include <linux/stringify.h>
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-#include <linux/clocksource.h>
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-#include <linux/clockchips.h>
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-
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-#include <mach/processor-ns9360.h>
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-#include <mach/regs-sys-ns9360.h>
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-#include <mach/irqs.h>
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-#include <mach/system.h>
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-#include "generic.h"
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-
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-#define TIMER_CLOCKSOURCE 0
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-#define TIMER_CLOCKEVENT 1
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-static u32 latch;
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-
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-static cycle_t ns9360_clocksource_read(struct clocksource *cs)
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-{
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- return __raw_readl(SYS_TR(TIMER_CLOCKSOURCE));
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-}
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-
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-static struct clocksource ns9360_clocksource = {
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- .name = "ns9360-timer" __stringify(TIMER_CLOCKSOURCE),
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- .rating = 300,
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- .read = ns9360_clocksource_read,
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- .mask = CLOCKSOURCE_MASK(32),
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- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
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-};
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-
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-static void ns9360_clockevent_setmode(enum clock_event_mode mode,
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- struct clock_event_device *clk)
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-{
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- u32 tc = __raw_readl(SYS_TC(TIMER_CLOCKEVENT));
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-
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- switch (mode) {
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- case CLOCK_EVT_MODE_PERIODIC:
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- __raw_writel(latch, SYS_TRC(TIMER_CLOCKEVENT));
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- REGSET(tc, SYS_TCx, REN, EN);
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- REGSET(tc, SYS_TCx, INTS, EN);
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- REGSET(tc, SYS_TCx, TEN, EN);
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- break;
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-
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- case CLOCK_EVT_MODE_ONESHOT:
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- REGSET(tc, SYS_TCx, REN, DIS);
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- REGSET(tc, SYS_TCx, INTS, EN);
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-
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- /* fall through */
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-
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- case CLOCK_EVT_MODE_UNUSED:
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- case CLOCK_EVT_MODE_SHUTDOWN:
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- case CLOCK_EVT_MODE_RESUME:
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- default:
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- REGSET(tc, SYS_TCx, TEN, DIS);
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- break;
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- }
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-
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- __raw_writel(tc, SYS_TC(TIMER_CLOCKEVENT));
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-}
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-
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-static int ns9360_clockevent_setnextevent(unsigned long evt,
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- struct clock_event_device *clk)
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-{
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- u32 tc = __raw_readl(SYS_TC(TIMER_CLOCKEVENT));
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-
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- if (REGGET(tc, SYS_TCx, TEN)) {
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- REGSET(tc, SYS_TCx, TEN, DIS);
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- __raw_writel(tc, SYS_TC(TIMER_CLOCKEVENT));
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- }
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-
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- REGSET(tc, SYS_TCx, TEN, EN);
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-
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- __raw_writel(evt, SYS_TRC(TIMER_CLOCKEVENT));
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-
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- __raw_writel(tc, SYS_TC(TIMER_CLOCKEVENT));
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-
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- return 0;
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-}
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-
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-static struct clock_event_device ns9360_clockevent_device = {
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- .name = "ns9360-timer" __stringify(TIMER_CLOCKEVENT),
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- .shift = 20,
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- .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
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- .set_mode = ns9360_clockevent_setmode,
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- .set_next_event = ns9360_clockevent_setnextevent,
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-};
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-
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-static irqreturn_t ns9360_clockevent_handler(int irq, void *dev_id)
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-{
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- int timerno = irq - IRQ_NS9360_TIMER0;
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- u32 tc;
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-
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- struct clock_event_device *evt = &ns9360_clockevent_device;
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-
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- /* clear irq */
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- tc = __raw_readl(SYS_TC(timerno));
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- if (REGGET(tc, SYS_TCx, REN) == SYS_TCx_REN_DIS) {
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- REGSET(tc, SYS_TCx, TEN, DIS);
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- __raw_writel(tc, SYS_TC(timerno));
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- }
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- REGSET(tc, SYS_TCx, INTC, SET);
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- __raw_writel(tc, SYS_TC(timerno));
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- REGSET(tc, SYS_TCx, INTC, UNSET);
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- __raw_writel(tc, SYS_TC(timerno));
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-
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- evt->event_handler(evt);
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-
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- return IRQ_HANDLED;
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-}
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-
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-static struct irqaction ns9360_clockevent_action = {
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- .name = "ns9360-timer" __stringify(TIMER_CLOCKEVENT),
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- .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
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- .handler = ns9360_clockevent_handler,
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-};
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-
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-static void __init ns9360_timer_init(void)
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-{
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- int tc;
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-
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- tc = __raw_readl(SYS_TC(TIMER_CLOCKSOURCE));
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- if (REGGET(tc, SYS_TCx, TEN)) {
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- REGSET(tc, SYS_TCx, TEN, DIS);
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- __raw_writel(tc, SYS_TC(TIMER_CLOCKSOURCE));
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- }
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-
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- __raw_writel(0, SYS_TRC(TIMER_CLOCKSOURCE));
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-
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- REGSET(tc, SYS_TCx, TEN, EN);
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- REGSET(tc, SYS_TCx, TDBG, STOP);
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- REGSET(tc, SYS_TCx, TLCS, CPU);
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- REGSET(tc, SYS_TCx, TM, IEE);
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- REGSET(tc, SYS_TCx, INTS, DIS);
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- REGSET(tc, SYS_TCx, UDS, UP);
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- REGSET(tc, SYS_TCx, TSZ, 32);
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- REGSET(tc, SYS_TCx, REN, EN);
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-
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- __raw_writel(tc, SYS_TC(TIMER_CLOCKSOURCE));
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-
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- clocksource_register_hz(&ns9360_clocksource, ns9360_cpuclock());
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-
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- latch = SH_DIV(ns9360_cpuclock(), HZ, 0);
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-
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- tc = __raw_readl(SYS_TC(TIMER_CLOCKEVENT));
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- REGSET(tc, SYS_TCx, TEN, DIS);
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- REGSET(tc, SYS_TCx, TDBG, STOP);
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- REGSET(tc, SYS_TCx, TLCS, CPU);
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- REGSET(tc, SYS_TCx, TM, IEE);
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- REGSET(tc, SYS_TCx, INTS, DIS);
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- REGSET(tc, SYS_TCx, UDS, DOWN);
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- REGSET(tc, SYS_TCx, TSZ, 32);
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- REGSET(tc, SYS_TCx, REN, EN);
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- __raw_writel(tc, SYS_TC(TIMER_CLOCKEVENT));
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-
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- ns9360_clockevent_device.mult = div_sc(ns9360_cpuclock(),
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- NSEC_PER_SEC, ns9360_clockevent_device.shift);
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- ns9360_clockevent_device.max_delta_ns =
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- clockevent_delta2ns(-1, &ns9360_clockevent_device);
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- ns9360_clockevent_device.min_delta_ns =
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- clockevent_delta2ns(1, &ns9360_clockevent_device);
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-
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- ns9360_clockevent_device.cpumask = cpumask_of(0);
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- clockevents_register_device(&ns9360_clockevent_device);
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-
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- setup_irq(IRQ_NS9360_TIMER0 + TIMER_CLOCKEVENT,
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- &ns9360_clockevent_action);
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-}
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-
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-struct sys_timer ns9360_timer = {
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- .init = ns9360_timer_init,
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-};
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