NetBSD-5.0.2/sys/arch/shark/isa/isa_irqhandler.c
/* $NetBSD: isa_irqhandler.c,v 1.21 2008/04/27 18:58:47 matt Exp $ */
/*
* Copyright 1997
* Digital Equipment Corporation. All rights reserved.
*
* This software is furnished under license and may be used and
* copied only in accordance with the following terms and conditions.
* Subject to these conditions, you may download, copy, install,
* use, modify and distribute this software in source and/or binary
* form. No title or ownership is transferred hereby.
*
* 1) Any source code used, modified or distributed must reproduce
* and retain this copyright notice and list of conditions as
* they appear in the source file.
*
* 2) No right is granted to use any trade name, trademark, or logo of
* Digital Equipment Corporation. Neither the "Digital Equipment
* Corporation" name nor any trademark or logo of Digital Equipment
* Corporation may be used to endorse or promote products derived
* from this software without the prior written permission of
* Digital Equipment Corporation.
*
* 3) This software is provided "AS-IS" and any express or implied
* warranties, including but not limited to, any implied warranties
* of merchantability, fitness for a particular purpose, or
* non-infringement are disclaimed. In no event shall DIGITAL be
* liable for any damages whatsoever, and in particular, DIGITAL
* shall not be liable for special, indirect, consequential, or
* incidental damages or damages for lost profits, loss of
* revenue or loss of use, whether such damages arise in contract,
* negligence, tort, under statute, in equity, at law or otherwise,
* even if advised of the possibility of such damage.
*/
/*
* 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.
*
* IRQ/FIQ initialisation, claim, release and handler routines
*
* from: irqhandler.c
*
* Created : 30/09/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: isa_irqhandler.c,v 1.21 2008/04/27 18:58:47 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[NIPL];
/* Prototypes */
extern void set_spl_masks(void);
void irq_calculatemasks(void);
void stray_irqhandler(u_int);
#define WriteWord(a, b) *((volatile unsigned int *)(a)) = (b)
/*
* 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 < NIPL; ++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;
{
#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 >= NIPL)
return(-1);
/* Attach evcnt */
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;
irq_calculatemasks();
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;
{
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 */
prehand = &irqhandlers[irq];
irqhand = *prehand;
while (irqhand && handler != irqhand) {
prehand = &irqhand->ih_next;
irqhand = *prehand;
}
/* Remove the handler if located */
if (irqhand)
*prehand = irqhand->ih_next;
else
return(-1);
/* The handler has been removed from the chain so mark it 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;
evcnt_detach(&irqhand->ih_ev);
irq_calculatemasks();
/*
* 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);
}
/* adapted from .../i386/isa/isa_machdep.c */
/*
* Recalculate the interrupt masks from scratch.
* We could code special registry and deregistry versions of this function that
* would be faster, but the code would be nastier, and we don't expect this to
* happen very much anyway.
*/
void
irq_calculatemasks()
{
int irq, level;
irqhandler_t *ptr;
int irqlevel[NIRQS];
/* First, figure out which levels each IRQ uses. */
for (irq = 0; irq < NIRQS; irq++) {
int levels = 0;
for (ptr = irqhandlers[irq]; ptr; ptr = ptr->ih_next)
levels |= 1 << ptr->ih_level;
irqlevel[irq] = levels;
}
/* Then figure out which IRQs use each level. */
for (level = 0; level < NIPL; level++) {
int irqs = 0;
for (irq = 0; irq < NIRQS; irq++)
if (irqlevel[irq] & (1 << level))
irqs |= 1 << irq;
irqmasks[level] = ~irqs;
}
/*
* Enforce a hierarchy that gives slow devices a better chance at not
* dropping data.
*/
KASSERT(irqmasks[IPL_NONE] == ~0);
irqmasks[IPL_SOFTCLOCK] &= irqmasks[IPL_NONE];
irqmasks[IPL_SOFTBIO] &= irqmasks[IPL_SOFTCLOCK];
irqmasks[IPL_SOFTNET] &= irqmasks[IPL_SOFTBIO];
irqmasks[IPL_SOFTSERIAL] &= irqmasks[IPL_SOFTNET];
irqmasks[IPL_VM] &= irqmasks[IPL_SOFTSERIAL];
irqmasks[IPL_CLOCK] &= irqmasks[IPL_VM];
irqmasks[IPL_HIGH] &= irqmasks[IPL_CLOCK];
}
void *
intr_claim(irq, level, ih_func, ih_arg, group, name)
int irq;
int level;
int (*ih_func)(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;
{
u_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;
{
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(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" : "");
}