89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
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/*
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* BRIEF MODULE DESCRIPTION
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* Galileo EV96100 rtc routines.
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*
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* Copyright 2000 MontaVista Software Inc.
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* Author: MontaVista Software, Inc.
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* ppopov@mvista.com or source@mvista.com
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*
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* This file was derived from Carsten Langgaard's
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* arch/mips/mips-boards/atlas/atlas_rtc.c.
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*
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999,2000 MIPS Technologies, Inc. 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 as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/kernel_stat.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/timex.h>
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#include <asm/mipsregs.h>
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#include <asm/ptrace.h>
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#include <asm/time.h>
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#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
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extern volatile unsigned long wall_jiffies;
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unsigned long missed_heart_beats = 0;
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static unsigned long r4k_offset; /* Amount to increment compare reg each time */
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static unsigned long r4k_cur; /* What counter should be at next timer irq */
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static inline void ack_r4ktimer(unsigned long newval)
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{
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write_c0_compare(newval);
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}
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/*
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* There are a lot of conceptually broken versions of the MIPS timer interrupt
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* handler floating around. This one is rather different, but the algorithm
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* is probably more robust.
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*/
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void mips_timer_interrupt(struct pt_regs *regs)
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{
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int irq = 7; /* FIX ME */
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if (r4k_offset == 0) {
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goto null;
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}
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do {
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kstat_this_cpu.irqs[irq]++;
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do_timer(regs);
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#ifndef CONFIG_SMP
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update_process_times(user_mode(regs));
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#endif
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r4k_cur += r4k_offset;
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ack_r4ktimer(r4k_cur);
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} while (((unsigned long)read_c0_count()
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- r4k_cur) < 0x7fffffff);
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return;
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null:
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ack_r4ktimer(0);
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}
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