NetBSD-5.0.2/sys/arch/arm/ofw/ofw_irqhandler.c
/* $NetBSD: ofw_irqhandler.c,v 1.13 2008/01/06 03:45:27 matt Exp $ */
/*
* Copyright (c) 1994-1998 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Mark Brinicombe
* for the NetBSD Project.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* from: irqhandler.c
*
* IRQ/FIQ initialisation, claim, release and handler routines
*
* Created : 30/09/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ofw_irqhandler.c,v 1.13 2008/01/06 03:45:27 matt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <uvm/uvm_extern.h>
#include <machine/intr.h>
#include <machine/irqhandler.h>
#include <machine/cpu.h>
irqhandler_t *irqhandlers[NIRQS];
u_int current_mask;
u_int actual_mask;
u_int disabled_mask;
u_int irqmasks[IPL_LEVELS];
extern u_int intrcnt[];
extern char *_intrnames;
/* Prototypes */
int podule_irqhandler __P((void));
extern void set_spl_masks __P((void));
/*
* void irq_init(void)
*
* Initialise the IRQ/FIQ sub system
*/
void
irq_init()
{
int loop;
/* Clear all the IRQ handlers and the irq block masks */
for (loop = 0; loop < NIRQS; ++loop) {
irqhandlers[loop] = NULL;
}
/*
* Setup the irqmasks for the different Interrupt Priority Levels
* We will start with no bits set and these will be updated as handlers
* are installed at different IPL's.
*/
for (loop = 0; loop < IPL_LEVELS; ++loop)
irqmasks[loop] = 0;
current_mask = 0x00000000;
disabled_mask = 0x00000000;
actual_mask = 0x00000000;
set_spl_masks();
/* Enable IRQ's and FIQ's */
enable_interrupts(I32_bit | F32_bit);
}
/*
* int irq_claim(int irq, irqhandler_t *handler)
*
* Enable an IRQ and install a handler for it.
*/
int
irq_claim(irq, handler, group, name)
int irq;
irqhandler_t *handler;
const char *group;
const char *name;
{
int level;
#ifdef DIAGNOSTIC
/* Sanity check */
if (handler == NULL)
panic("NULL interrupt handler");
if (handler->ih_func == NULL)
panic("Interrupt handler does not have a function");
#endif /* DIAGNOSTIC */
/*
* IRQ_INSTRUCT indicates that we should get the irq number
* from the irq structure
*/
if (irq == IRQ_INSTRUCT)
irq = handler->ih_num;
/* Make sure the irq number is valid */
if (irq < 0 || irq >= NIRQS)
return(-1);
/* Make sure the level is valid */
if (handler->ih_level < 0 || handler->ih_level >= IPL_LEVELS)
return(-1);
evcnt_attach_dynamic(&handler->ih_ev, EVCNT_TYPE_INTR, NULL,
group, name);
/* Attach handler at top of chain */
handler->ih_next = irqhandlers[irq];
irqhandlers[irq] = handler;
/*
* Reset the flags for this handler.
* As the handler is now in the chain mark it as active.
*/
handler->ih_flags = 0 | IRQ_FLAG_ACTIVE;
/*
* Record the interrupt number for accounting.
* Done here as the accounting number may not be the same as the
* IRQ number though for the moment they are
*/
handler->ih_num = irq;
/*
* Update the irq masks.
* Find the lowest interrupt priority on the irq chain.
* Interrupt is allowable at priorities lower than this.
* If ih_level is out of range then don't bother to update
* the masks.
*/
if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) {
irqhandler_t *ptr;
/*
* Find the lowest interrupt priority on the irq chain.
* Interrupt is allowable at priorities lower than this.
*/
ptr = irqhandlers[irq];
if (ptr) {
level = ptr->ih_level - 1;
while (ptr) {
if (ptr->ih_level - 1 < level)
level = ptr->ih_level - 1;
ptr = ptr->ih_next;
}
while (level >= 0) {
irqmasks[level] |= (1 << irq);
--level;
}
}
#include "sl.h"
#include "ppp.h"
#if NSL > 0 || NPPP > 0
/* In the presence of SLIP or PPP, splimp > spltty. */
irqmasks[IPL_NET] &= irqmasks[IPL_TTY];
#endif
}
enable_irq(irq);
set_spl_masks();
return(0);
}
/*
* int irq_release(int irq, irqhandler_t *handler)
*
* Disable an IRQ and remove a handler for it.
*/
int
irq_release(irq, handler)
int irq;
irqhandler_t *handler;
{
int level;
irqhandler_t *irqhand;
irqhandler_t **prehand;
/*
* IRQ_INSTRUCT indicates that we should get the irq number
* from the irq structure
*/
if (irq == IRQ_INSTRUCT)
irq = handler->ih_num;
/* Make sure the irq number is valid */
if (irq < 0 || irq >= NIRQS)
return(-1);
/* Locate the handler */
irqhand = irqhandlers[irq];
prehand = &irqhandlers[irq];
while (irqhand && handler != irqhand) {
prehand = &irqhand;
irqhand = irqhand->ih_next;
}
/* Remove the handler if located */
if (irqhand)
*prehand = irqhand->ih_next;
else
return(-1);
/* Now the handler has been removed from the chain mark is as inactive */
irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE;
/* Make sure the head of the handler list is active */
if (irqhandlers[irq])
irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE;
/*
* Update the irq masks.
* If ih_level is out of range then don't bother to update
* the masks.
*/
if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) {
irqhandler_t *ptr;
/* Clean the bit from all the masks */
for (level = 0; level < IPL_LEVELS; ++level)
irqmasks[level] &= ~(1 << irq);
/*
* Find the lowest interrupt priority on the irq chain.
* Interrupt is allowable at priorities lower than this.
*/
ptr = irqhandlers[irq];
if (ptr) {
level = ptr->ih_level - 1;
while (ptr) {
if (ptr->ih_level - 1 < level)
level = ptr->ih_level - 1;
ptr = ptr->ih_next;
}
while (level >= 0) {
irqmasks[level] |= (1 << irq);
--level;
}
}
}
/*
* Disable the appropriate mask bit if there are no handlers left for
* this IRQ.
*/
if (irqhandlers[irq] == NULL)
disable_irq(irq);
set_spl_masks();
return(0);
}
void *
intr_claim(irq, level, ih_func, ih_arg, group, name)
int irq;
int level;
int (*ih_func) __P((void *));
void *ih_arg;
const char *group;
const char *name;
{
irqhandler_t *ih;
ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT|M_ZERO);
if (!ih)
panic("intr_claim(): Cannot malloc handler memory");
ih->ih_level = level;
ih->ih_func = ih_func;
ih->ih_arg = ih_arg;
ih->ih_flags = 0;
if (irq_claim(irq, ih, group, name) != 0)
return(NULL);
return(ih);
}
int
intr_release(arg)
void *arg;
{
irqhandler_t *ih = (irqhandler_t *)arg;
if (irq_release(ih->ih_num, ih) == 0) {
free(ih, M_DEVBUF);
return(0);
}
return(1);
}
/*
* void disable_irq(int irq)
*
* Disables a specific irq. The irq is removed from the master irq mask
*/
void
disable_irq(irq)
int irq;
{
register int oldirqstate;
oldirqstate = disable_interrupts(I32_bit);
current_mask &= ~(1 << irq);
irq_setmasks();
restore_interrupts(oldirqstate);
}
/*
* void enable_irq(int irq)
*
* Enables a specific irq. The irq is added to the master irq mask
* This routine should be used with caution. A handler should already
* be installed.
*/
void
enable_irq(irq)
int irq;
{
register u_int oldirqstate;
oldirqstate = disable_interrupts(I32_bit);
current_mask |= (1 << irq);
irq_setmasks();
restore_interrupts(oldirqstate);
}
/*
* void stray_irqhandler(u_int mask)
*
* Handler for stray interrupts. This gets called if a handler cannot be
* found for an interrupt.
*/
void stray_irqhandler(u_int); /* called from assembly */
void
stray_irqhandler(mask)
u_int mask;
{
static u_int stray_irqs = 0;
if (++stray_irqs <= 8)
log(LOG_ERR, "Stray interrupt %08x%s\n", mask,
stray_irqs >= 8 ? ": stopped logging" : "");
}