272489fe59
the implementation can guarantee forward progress in the event of a stuck interrupt or interrupt storm. This is especially critical for fast interrupt handlers, as they can cause a hard hang in that case. When first called, arm_get_next_irq() is passed -1. Obtained from: Juniper Networks, Inc.
151 lines
5.1 KiB
C
151 lines
5.1 KiB
C
/* $NetBSD: sa11x0_irqhandler.c,v 1.5 2003/08/07 16:26:54 agc Exp $ */
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/*-
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* Copyright (c) 1996, 1997, 1998, 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to the NetBSD Foundation
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* by IWAMOTO Toshihiro.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace
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* Simulation Facility, NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)isa.c 7.2 (Berkeley) 5/13/91
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/syslog.h>
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#include <sys/malloc.h>
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#include <sys/bus.h>
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#include <sys/interrupt.h>
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#include <sys/rman.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <arm/sa11x0/sa11x0_reg.h>
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#include <arm/sa11x0/sa11x0_var.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#define NIRQS 0x20
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struct intrhand *irqhandlers[NIRQS];
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int current_intr_depth;
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extern struct sa11x0_softc *sa11x0_softc;
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static uint32_t sa11x0_irq_mask = 0xfffffff;
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extern vm_offset_t saipic_base;
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int
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arm_get_next_irq(int last __unused)
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{
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int irq;
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if ((irq = (bus_space_read_4(sa11x0_softc->sc_iot, sa11x0_softc->sc_ioh,
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SAIPIC_IP) &
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sa11x0_irq_mask)) != 0)
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return (ffs(irq) - 1);
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return (-1);
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}
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void
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arm_mask_irq(uintptr_t irq)
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{
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sa11x0_irq_mask &= ~(1 << irq);
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__asm __volatile("str %0, [%1, #0x04]" /* SAIPIC_MR */
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: : "r" (sa11x0_irq_mask), "r" (saipic_base));
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}
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void
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arm_unmask_irq(uintptr_t irq)
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{
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sa11x0_irq_mask |= (1 << irq);
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__asm __volatile("str %0, [%1, #0x04]" /* SAIPIC_MR */
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: : "r" (sa11x0_irq_mask), "r" (saipic_base));
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}
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void stray_irqhandler(void *);
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void
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stray_irqhandler(void *p)
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{
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printf("stray interrupt %p\n", p);
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}
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/* End of irqhandler.c */
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