xref: /src/sys/arch/atari/isa/isa_hades.c

/*	$NetBSD: isa_hades.c,v 1.10 2023/01/06 10:28:28 tsutsui 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.
 *
 * 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: isa_hades.c,v 1.10 2023/01/06 10:28:28 tsutsui Exp $");

#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(void)
{
}

/*
 * 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(int, int);

static int
iifun(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(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(isa_chipset_tag_t ic, int irq, int type, int level, int (*ih_fun)(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");

	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(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");

	(void) intr_disestablish(iinfo_p->ihand);
	iinfo_p->slot = -1;
}