193c3cc125
Move the xtime write mode seqlock into timer_tick(), so it only surrounds the call to do_timer(). This avoids a deadlock in update_process_times() ... hrtimer_get_softirq_time() which tries to get a read mode seqlock on xtime, thereby preventing booting. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*
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* arch/arm/mach-lh7a40x/time.c
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*
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* Copyright (C) 2004 Logic Product Development
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/time.h>
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#include <asm/hardware.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/leds.h>
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#include <asm/mach/time.h>
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#include "common.h"
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#if HZ < 100
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# define TIMER_CONTROL TIMER_CONTROL2
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# define TIMER_LOAD TIMER_LOAD2
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# define TIMER_CONSTANT (508469/HZ)
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# define TIMER_MODE (TIMER_C_ENABLE | TIMER_C_PERIODIC | TIMER_C_508KHZ)
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# define TIMER_EOI TIMER_EOI2
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# define TIMER_IRQ IRQ_T2UI
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#else
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# define TIMER_CONTROL TIMER_CONTROL3
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# define TIMER_LOAD TIMER_LOAD3
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# define TIMER_CONSTANT (3686400/HZ)
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# define TIMER_MODE (TIMER_C_ENABLE | TIMER_C_PERIODIC)
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# define TIMER_EOI TIMER_EOI3
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# define TIMER_IRQ IRQ_T3UI
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#endif
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static irqreturn_t
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lh7a40x_timer_interrupt(int irq, void *dev_id)
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{
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TIMER_EOI = 0;
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timer_tick();
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return IRQ_HANDLED;
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}
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static struct irqaction lh7a40x_timer_irq = {
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.name = "LHA740x Timer Tick",
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.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
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.handler = lh7a40x_timer_interrupt,
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};
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static void __init lh7a40x_timer_init (void)
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{
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/* Stop/disable all timers */
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TIMER_CONTROL1 = 0;
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TIMER_CONTROL2 = 0;
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TIMER_CONTROL3 = 0;
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setup_irq (TIMER_IRQ, &lh7a40x_timer_irq);
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TIMER_LOAD = TIMER_CONSTANT;
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TIMER_CONTROL = TIMER_MODE;
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}
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struct sys_timer lh7a40x_timer = {
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.init = &lh7a40x_timer_init,
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};
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