NetBSD/sys/arch/evbarm/ifpga/ifpga_irqhandler.c

464 lines
11 KiB
C

/* $NetBSD: ifpga_irqhandler.c,v 1.2 2002/01/30 03:59:41 thorpej Exp $ */
/*
* Copyright (c) 1994-1998 Mark Brinicombe.
* Copyright (c) 1997 Causality Limited
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* 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 OR CONTRIBUTORS 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: iomd_irqhandler.c,v 1.16 $
*/
#include "opt_irqstats.h"
#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 <evbarm/ifpga/irqhandler.h> /* XXX XXX XXX */
#include <machine/cpu.h>
irqhandler_t *irqhandlers[NIRQS];
int current_intr_depth; /* Depth of interrupt nesting */
u_int intr_claimed_mask; /* Interrupts that are claimed */
u_int intr_disabled_mask; /* Interrupts that are temporarily disabled */
u_int intr_current_mask; /* Interrupts currently allowable */
u_int spl_mask;
u_int irqmasks[NIPL];
u_int irqblock[NIRQS];
extern u_int soft_interrupts; /* Only so we can initialise it */
extern char *_intrnames;
extern void set_spl_masks __P((void));
void
irq_init(void)
{
int loop;
/* Clear all the IRQ handlers and the irq block masks */
for (loop = 0; loop < NIRQS; ++loop) {
irqhandlers[loop] = NULL;
irqblock[loop] = 0;
}
/*
* 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_intr_depth = 0;
intr_claimed_mask = 0x00000000;
intr_disabled_mask = 0x00000000;
intr_current_mask = 0x00000000;
spl_mask = 0x00000000;
soft_interrupts = 0x00000000;
set_spl_masks();
}
/* Run the irq initialization code that can't be done until the IRQ
controller is mapped. */
void
irq_postinit()
{
irq_setmasks();
/* Enable IRQ's and FIQ's */
enable_interrupts(I32_bit | F32_bit);
}
void
stray_irqhandler()
{
panic("stray irq\n");
}
/*
* void disable_irq(int irq)
*
* Disables a specific irq. The irq is removed from the master irq mask
*
* Use of this function outside this file is deprecated.
*/
void
disable_irq(irq)
int irq;
{
int oldirqstate;
oldirqstate = disable_interrupts(I32_bit);
intr_claimed_mask &= ~(1 << irq);
intr_current_mask = intr_claimed_mask & ~intr_disabled_mask;
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.
*
* Use of this function outside this file is deprecated.
*/
void
enable_irq(irq)
int irq;
{
u_int oldirqstate;
oldirqstate = disable_interrupts(I32_bit);
intr_claimed_mask |= (1 << irq);
intr_current_mask = intr_claimed_mask & ~intr_disabled_mask;
irq_setmasks();
restore_interrupts(oldirqstate);
}
/*
* int irq_claim(int irq, irqhandler_t *handler)
*
* Enable an IRQ and install a handler for it.
*/
int
irq_claim(irq, handler)
int irq;
irqhandler_t *handler;
{
int level;
int loop;
#ifdef DIAGNOSTIC
/* Sanity check */
if (handler == NULL)
panic("NULL interrupt handler\n");
if (handler->ih_func == NULL)
panic("Interrupt handler does not have a function\n");
#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 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;
#ifdef IRQSTATS
/* Get the interrupt name from the head of the list */
if (handler->ih_name) {
char *ptr = _intrnames + (irq * 14);
strcpy(ptr, " ");
strncpy(ptr, handler->ih_name,
min(strlen(handler->ih_name), 13));
} else {
char *ptr = _intrnames + (irq * 14);
sprintf(ptr, "irq %2d ", irq);
}
#endif /* IRQSTATS */
/*
* 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 < NIPL) {
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;
}
for (loop = 0; loop < NIPL; ++loop) {
if (level >= loop)
irqmasks[loop] |= (1 << irq);
else
irqmasks[loop] &= ~(1 << irq);
}
}
#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
}
/*
* We now need to update the irqblock array. This array indicates
* what other interrupts should be blocked when interrupt is asserted
* This basically emulates hardware interrupt priorities e.g. by blocking
* all other IPL_BIO interrupts with an IPL_BIO interrupt is asserted.
* For each interrupt we find the highest IPL and set the block mask to
* the interrupt mask for that level.
*/
for (loop = 0; loop < NIRQS; ++loop) {
irqhandler_t *ptr;
ptr = irqhandlers[loop];
if (ptr) {
/* There is at least 1 handler so scan the chain */
level = ptr->ih_level;
while (ptr) {
if (ptr->ih_level > level)
level = ptr->ih_level;
ptr = ptr->ih_next;
}
irqblock[loop] = ~irqmasks[level];
} else
/* No handlers for this irq so nothing to block */
irqblock[loop] = 0;
}
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;
int loop;
irqhandler_t *irqhand;
irqhandler_t **prehand;
#ifdef IRQSTATS
extern char *_intrnames;
#endif /* IRQSTATS */
/*
* 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->ih_next;
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;
#ifdef IRQSTATS
/* Get the interrupt name from the head of the list */
if (irqhandlers[irq] && irqhandlers[irq]->ih_name) {
char *ptr = _intrnames + (irq * 14);
strcpy(ptr, " ");
strncpy(ptr, irqhandlers[irq]->ih_name,
min(strlen(irqhandlers[irq]->ih_name), 13));
} else {
char *ptr = _intrnames + (irq * 14);
sprintf(ptr, "irq %2d ", irq);
}
#endif /* IRQSTATS */
/*
* 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 < NIPL) {
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;
}
for (loop = 0; loop < NIPL; ++loop) {
if (level >= loop)
irqmasks[loop] |= (1 << irq);
else
irqmasks[loop] &= ~(1 << irq);
}
}
}
/*
* We now need to update the irqblock array. This array indicates
* what other interrupts should be blocked when interrupt is asserted
* This basically emulates hardware interrupt priorities e.g. by
* blocking all other IPL_BIO interrupts with an IPL_BIO interrupt
* is asserted. For each interrupt we find the highest IPL and set
* the block mask to the interrupt mask for that level.
*/
for (loop = 0; loop < NIRQS; ++loop) {
irqhandler_t *ptr;
ptr = irqhandlers[loop];
if (ptr) {
/* There is at least 1 handler so scan the chain */
level = ptr->ih_level;
while (ptr) {
if (ptr->ih_level > level)
level = ptr->ih_level;
ptr = ptr->ih_next;
}
irqblock[loop] = ~irqmasks[level];
} else
/* No handlers for this irq so nothing to block */
irqblock[loop] = 0;
}
/*
* 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, name, ih_func, ih_arg)
int irq;
int level;
const char *name;
int (*ih_func) __P((void *));
void *ih_arg;
{
irqhandler_t *ih;
ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT);
if (!ih)
panic("intr_claim(): Cannot malloc handler memory\n");
ih->ih_level = level;
ih->ih_name = name;
ih->ih_func = ih_func;
ih->ih_arg = ih_arg;
ih->ih_flags = 0;
if (irq_claim(irq, ih) != 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);
}