482 lines
11 KiB
C
482 lines
11 KiB
C
/* $NetBSD: ofw_irqhandler.c,v 1.1 2002/02/06 21:30:26 thorpej Exp $ */
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/*
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* Copyright (c) 1994-1998 Mark Brinicombe.
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* Copyright (c) 1994 Brini.
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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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 Mark Brinicombe
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* for the NetBSD Project.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN 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 USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* 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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* from: irqhandler.c
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*
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* IRQ/FIQ initialisation, claim, release and handler routines
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*
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* Created : 30/09/94
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*/
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#include "opt_irqstats.h"
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#include <sys/param.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 <uvm/uvm_extern.h>
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#include <machine/intr.h>
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#include <machine/cpu.h>
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irqhandler_t *irqhandlers[NIRQS];
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int current_intr_depth;
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u_int current_mask;
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u_int actual_mask;
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u_int disabled_mask;
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u_int spl_mask;
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u_int irqmasks[IPL_LEVELS];
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u_int irqblock[NIRQS];
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extern u_int intrcnt[];
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extern u_int soft_interrupts; /* Only so we can initialise it */
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extern char *_intrnames;
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/* Prototypes */
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int podule_irqhandler __P((void));
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extern void set_spl_masks __P((void));
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/*
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* void irq_init(void)
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*
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* Initialise the IRQ/FIQ sub system
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*/
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void
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irq_init()
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{
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int loop;
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/* Clear all the IRQ handlers and the irq block masks */
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for (loop = 0; loop < NIRQS; ++loop) {
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irqhandlers[loop] = NULL;
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irqblock[loop] = 0;
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}
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/*
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* Setup the irqmasks for the different Interrupt Priority Levels
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* We will start with no bits set and these will be updated as handlers
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* are installed at different IPL's.
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*/
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for (loop = 0; loop < IPL_LEVELS; ++loop)
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irqmasks[loop] = 0;
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current_intr_depth = 0;
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current_mask = 0x00000000;
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disabled_mask = 0x00000000;
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actual_mask = 0x00000000;
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spl_mask = 0x00000000;
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soft_interrupts = 0x00000000;
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set_spl_masks();
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/* Enable IRQ's and FIQ's */
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enable_interrupts(I32_bit | F32_bit);
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}
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/*
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* int irq_claim(int irq, irqhandler_t *handler)
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*
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* Enable an IRQ and install a handler for it.
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*/
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int
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irq_claim(irq, handler)
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int irq;
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irqhandler_t *handler;
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{
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int level;
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int loop;
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#ifdef DIAGNOSTIC
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/* Sanity check */
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if (handler == NULL)
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panic("NULL interrupt handler\n");
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if (handler->ih_func == NULL)
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panic("Interrupt handler does not have a function\n");
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#endif /* DIAGNOSTIC */
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/*
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* IRQ_INSTRUCT indicates that we should get the irq number
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* from the irq structure
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*/
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if (irq == IRQ_INSTRUCT)
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irq = handler->ih_num;
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/* Make sure the irq number is valid */
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if (irq < 0 || irq >= NIRQS)
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return(-1);
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/* Make sure the level is valid */
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if (handler->ih_level < 0 || handler->ih_level >= IPL_LEVELS)
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return(-1);
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/* Attach handler at top of chain */
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handler->ih_next = irqhandlers[irq];
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irqhandlers[irq] = handler;
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/*
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* Reset the flags for this handler.
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* As the handler is now in the chain mark it as active.
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*/
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handler->ih_flags = 0 | IRQ_FLAG_ACTIVE;
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/*
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* Record the interrupt number for accounting.
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* Done here as the accounting number may not be the same as the
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* IRQ number though for the moment they are
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*/
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handler->ih_num = irq;
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#ifdef IRQSTATS
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/* Get the interrupt name from the head of the list */
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if (handler->ih_name) {
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char *ptr = _intrnames + (irq * 14);
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strcpy(ptr, " ");
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strncpy(ptr, handler->ih_name,
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min(strlen(handler->ih_name), 13));
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} else {
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char *ptr = _intrnames + (irq * 14);
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sprintf(ptr, "irq %2d ", irq);
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}
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#endif /* IRQSTATS */
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/*
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* Update the irq masks.
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* Find the lowest interrupt priority on the irq chain.
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* Interrupt is allowable at priorities lower than this.
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* If ih_level is out of range then don't bother to update
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* the masks.
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*/
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if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) {
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irqhandler_t *ptr;
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/*
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* Find the lowest interrupt priority on the irq chain.
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* Interrupt is allowable at priorities lower than this.
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*/
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ptr = irqhandlers[irq];
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if (ptr) {
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level = ptr->ih_level - 1;
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while (ptr) {
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if (ptr->ih_level - 1 < level)
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level = ptr->ih_level - 1;
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ptr = ptr->ih_next;
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}
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while (level >= 0) {
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irqmasks[level] |= (1 << irq);
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--level;
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}
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}
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#include "sl.h"
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#include "ppp.h"
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#if NSL > 0 || NPPP > 0
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/* In the presence of SLIP or PPP, splimp > spltty. */
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irqmasks[IPL_NET] &= irqmasks[IPL_TTY];
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#endif
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}
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/*
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* We now need to update the irqblock array. This array indicates
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* what other interrupts should be blocked when interrupt is asserted
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* This basically emulates hardware interrupt priorities e.g. by
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* blocking all other IPL_BIO interrupts with an IPL_BIO interrupt
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* is asserted. For each interrupt we find the highest IPL and set
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* the block mask to the interrupt mask for that level.
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*/
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for (loop = 0; loop < NIRQS; ++loop) {
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irqhandler_t *ptr;
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ptr = irqhandlers[loop];
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if (ptr) {
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/* There is at least 1 handler so scan the chain */
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level = ptr->ih_level;
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while (ptr) {
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if (ptr->ih_level > level)
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level = ptr->ih_level;
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ptr = ptr->ih_next;
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}
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irqblock[loop] = ~irqmasks[level];
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} else
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/* No handlers for this irq so nothing to block */
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irqblock[loop] = 0;
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}
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enable_irq(irq);
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set_spl_masks();
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return(0);
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}
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/*
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* int irq_release(int irq, irqhandler_t *handler)
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*
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* Disable an IRQ and remove a handler for it.
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*/
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int
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irq_release(irq, handler)
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int irq;
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irqhandler_t *handler;
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{
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int level;
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int loop;
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irqhandler_t *irqhand;
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irqhandler_t **prehand;
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extern char *_intrnames;
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/*
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* IRQ_INSTRUCT indicates that we should get the irq number
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* from the irq structure
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*/
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if (irq == IRQ_INSTRUCT)
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irq = handler->ih_num;
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/* Make sure the irq number is valid */
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if (irq < 0 || irq >= NIRQS)
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return(-1);
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/* Locate the handler */
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irqhand = irqhandlers[irq];
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prehand = &irqhandlers[irq];
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while (irqhand && handler != irqhand) {
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prehand = &irqhand;
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irqhand = irqhand->ih_next;
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}
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/* Remove the handler if located */
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if (irqhand)
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*prehand = irqhand->ih_next;
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else
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return(-1);
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/* Now the handler has been removed from the chain mark is as inactive */
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irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE;
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/* Make sure the head of the handler list is active */
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if (irqhandlers[irq])
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irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE;
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#ifdef IRQSTATS
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/* Get the interrupt name from the head of the list */
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if (irqhandlers[irq] && irqhandlers[irq]->ih_name) {
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char *ptr = _intrnames + (irq * 14);
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strcpy(ptr, " ");
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strncpy(ptr, irqhandlers[irq]->ih_name,
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min(strlen(irqhandlers[irq]->ih_name), 13));
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} else {
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char *ptr = _intrnames + (irq * 14);
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sprintf(ptr, "irq %2d ", irq);
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}
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#endif /* IRQSTATS */
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/*
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* Update the irq masks.
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* If ih_level is out of range then don't bother to update
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* the masks.
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*/
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if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) {
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irqhandler_t *ptr;
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/* Clean the bit from all the masks */
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for (level = 0; level < IPL_LEVELS; ++level)
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irqmasks[level] &= ~(1 << irq);
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/*
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* Find the lowest interrupt priority on the irq chain.
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* Interrupt is allowable at priorities lower than this.
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*/
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ptr = irqhandlers[irq];
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if (ptr) {
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level = ptr->ih_level - 1;
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while (ptr) {
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if (ptr->ih_level - 1 < level)
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level = ptr->ih_level - 1;
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ptr = ptr->ih_next;
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}
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while (level >= 0) {
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irqmasks[level] |= (1 << irq);
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--level;
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}
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}
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}
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/*
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* We now need to update the irqblock array. This array indicates
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* what other interrupts should be blocked when interrupt is asserted
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* This basically emulates hardware interrupt priorities e.g. by
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* blocking all other IPL_BIO interrupts with an IPL_BIO interrupt
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* is asserted. For each interrupt we find the highest IPL and set
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* the block mask to the interrupt mask for that level.
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*/
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for (loop = 0; loop < NIRQS; ++loop) {
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irqhandler_t *ptr;
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ptr = irqhandlers[loop];
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if (ptr) {
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/* There is at least 1 handler so scan the chain */
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level = ptr->ih_level;
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while (ptr) {
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if (ptr->ih_level > level)
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level = ptr->ih_level;
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ptr = ptr->ih_next;
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}
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irqblock[loop] = ~irqmasks[level];
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} else
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/* No handlers for this irq so nothing to block */
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irqblock[loop] = 0;
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}
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/*
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* Disable the appropriate mask bit if there are no handlers left for
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* this IRQ.
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*/
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if (irqhandlers[irq] == NULL)
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disable_irq(irq);
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set_spl_masks();
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return(0);
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}
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void *
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intr_claim(irq, level, name, ih_func, ih_arg)
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int irq;
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int level;
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const char *name;
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int (*ih_func) __P((void *));
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void *ih_arg;
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{
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irqhandler_t *ih;
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ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT);
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if (!ih)
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panic("intr_claim(): Cannot malloc handler memory\n");
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ih->ih_level = level;
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ih->ih_name = name;
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ih->ih_func = ih_func;
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ih->ih_arg = ih_arg;
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ih->ih_flags = 0;
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if (irq_claim(irq, ih) != 0)
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return(NULL);
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return(ih);
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}
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int
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intr_release(arg)
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void *arg;
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{
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irqhandler_t *ih = (irqhandler_t *)arg;
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if (irq_release(ih->ih_num, ih) == 0) {
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free(ih, M_DEVBUF);
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return(0);
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}
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return(1);
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}
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/*
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* void disable_irq(int irq)
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*
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* Disables a specific irq. The irq is removed from the master irq mask
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*/
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void
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disable_irq(irq)
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int irq;
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{
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register int oldirqstate;
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oldirqstate = disable_interrupts(I32_bit);
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current_mask &= ~(1 << irq);
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irq_setmasks();
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restore_interrupts(oldirqstate);
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}
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/*
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* void enable_irq(int irq)
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*
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* Enables a specific irq. The irq is added to the master irq mask
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* This routine should be used with caution. A handler should already
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* be installed.
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*/
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void
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enable_irq(irq)
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int irq;
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{
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register u_int oldirqstate;
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oldirqstate = disable_interrupts(I32_bit);
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current_mask |= (1 << irq);
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irq_setmasks();
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restore_interrupts(oldirqstate);
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}
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/*
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* void stray_irqhandler(u_int mask)
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*
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* Handler for stray interrupts. This gets called if a handler cannot be
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* found for an interrupt.
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*/
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void
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stray_irqhandler(mask)
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u_int mask;
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{
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static u_int stray_irqs = 0;
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if (++stray_irqs <= 8)
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log(LOG_ERR, "Stray interrupt %08x%s\n", mask,
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stray_irqs >= 8 ? ": stopped logging" : "");
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}
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