NetBSD/sys/arch/atari/isa/isa_hades.c

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/* $NetBSD: isa_hades.c,v 1.1 2001/04/24 06:39:48 leo Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Leo Weppelman.
*
* 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 the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION 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.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/isa/isavar.h>
#include <dev/isa/isareg.h>
#include <m68k/asm_single.h>
#include <machine/iomap.h>
#include <machine/mfp.h>
void isa_bus_init(void);
void
isa_bus_init()
{
}
/*
* The interrupt stuff is rather ugly. On the Hades, all interrupt lines
* for a slot are wired together and connected to either IO3 (slot1) or
* IO7 (slot2). Since no info can be obtained about the slot position
* at isa_intr_establish() time, the following assumption is made:
* - irq <= 6 -> slot 1
* - irq > 6 -> slot 2
*/
#define SLOTNR(irq) ((irq <= 6) ? 0 : 1)
static isa_intr_info_t iinfo[2] = { { -1 }, { -1 } };
static int iifun __P((int, int));
static int
iifun(slot, sr)
int slot;
int sr;
{
isa_intr_info_t *iinfo_p;
int s;
iinfo_p = &iinfo[slot];
/*
* Disable the interrupts
*/
if (slot == 0) {
single_inst_bclr_b(MFP->mf_imrb, IB_ISA1);
}
else {
single_inst_bclr_b(MFP->mf_imra, IA_ISA2);
}
if ((sr & PSL_IPL) >= (iinfo_p->ipl & PSL_IPL)) {
/*
* We're running at a too high priority now.
*/
add_sicallback((si_farg)iifun, (void*)slot, 0);
}
else {
s = splx(iinfo_p->ipl);
if (slot == 0) {
do {
MFP->mf_iprb = (u_int8_t)~IB_ISA1;
(void) (iinfo_p->ifunc)(iinfo_p->iarg);
} while (MFP->mf_iprb & IB_ISA1);
single_inst_bset_b(MFP->mf_imrb, IB_ISA1);
}
else {
do {
MFP->mf_ipra = (u_int8_t)~IA_ISA2;
(void) (iinfo_p->ifunc)(iinfo_p->iarg);
} while (MFP->mf_ipra & IA_ISA2);
single_inst_bset_b(MFP->mf_imra, IA_ISA2);
}
splx(s);
}
return 1;
}
/*
* XXXX
* XXXX Note that this function is not really working yet! The big problem is
* XXXX to only generate interrupts for the slot the card is in...
*/
int
isa_intr_alloc(ic, mask, type, irq)
isa_chipset_tag_t ic;
int mask;
int type;
int *irq;
{
isa_intr_info_t *iinfo_p;
int slot, i;
/*
* The Hades only supports edge triggered interrupts!
*/
if (type != IST_EDGE)
return 1;
#define MAXIRQ 10 /* XXX: Pure fiction */
for (i = 0; i < MAXIRQ; i++) {
if (mask & (1<<i)) {
slot = SLOTNR(i);
iinfo_p = &iinfo[slot];
if (iinfo_p->slot < 0) {
*irq = i;
printf("WARNING: isa_intr_alloc is not yet ready!\n"
" make sure the card is in slot %d!\n",
slot);
return 0;
}
}
}
return (1);
}
void *
isa_intr_establish(ic, irq, type, level, ih_fun, ih_arg)
isa_chipset_tag_t ic;
int irq, type, level;
int (*ih_fun) __P((void *));
void *ih_arg;
{
isa_intr_info_t *iinfo_p;
struct intrhand *ihand;
int slot;
/*
* The Hades only supports edge triggered interrupts!
*/
if (type != IST_EDGE)
return NULL;
slot = SLOTNR(irq);
iinfo_p = &iinfo[slot];
if (iinfo_p->slot >= 0)
panic("isa_intr_establish: interrupt was already established\n");
ihand = intr_establish((slot == 0) ? 3 : 15, USER_VEC, 0,
(hw_ifun_t)iifun, (void *)slot);
if (ihand != NULL) {
iinfo_p->slot = slot;
iinfo_p->ipl = level;
iinfo_p->ifunc = ih_fun;
iinfo_p->iarg = ih_arg;
iinfo_p->ihand = ihand;
/*
* Enable (unmask) the interrupt
*/
if (slot == 0) {
single_inst_bset_b(MFP->mf_imrb, IB_ISA1);
single_inst_bset_b(MFP->mf_ierb, IB_ISA1);
}
else {
single_inst_bset_b(MFP->mf_imra, IA_ISA2);
single_inst_bset_b(MFP->mf_iera, IA_ISA2);
}
return(iinfo_p);
}
return NULL;
}
void
isa_intr_disestablish(ic, handler)
isa_chipset_tag_t ic;
void *handler;
{
isa_intr_info_t *iinfo_p = (isa_intr_info_t *)handler;
if (iinfo_p->slot < 0)
panic("isa_intr_disestablish: interrupt was not established\n");
(void) intr_disestablish(iinfo_p->ihand);
iinfo_p->slot = -1;
}