NetBSD/sys/arch/atari/pci/pci_hades.c

/*	$NetBSD: pci_hades.c,v 1.1 2001/05/15 14:14:49 leo Exp $	*/

/*
 * Copyright (c) 1996 Leo Weppelman.  All rights reserved.
 * Copyright (c) 1996, 1997 Christopher G. Demetriou.  All rights reserved.
 * Copyright (c) 1994 Charles M. Hannum.  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 Charles M. Hannum.
 * 4. The name of the author may not 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.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <machine/bus.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>

#include <machine/cpu.h>
#include <machine/iomap.h>
#include <machine/mfp.h>
#include <machine/bswap.h>

#include <atari/atari/device.h>
#include <atari/pci/pci_vga.h>

int
pci_bus_maxdevs(pc, busno)
	pci_chipset_tag_t pc;
	int busno;
{
	return (4);
}

static int pci_config_offset __P((pcitag_t));

/*
 * Atari_init.c maps the config areas NBPG bytes apart....
 */
static int pci_config_offset(tag)
pcitag_t	tag;
{
	int	device;

	device = (tag >> 11) & 0x1f;
	return(device * NBPG);
}

pcireg_t
pci_conf_read(pc, tag, reg)
	pci_chipset_tag_t pc;
	pcitag_t tag;
	int reg;
{
	u_long	data;

	data = *(u_long *)(pci_conf_addr + pci_config_offset(tag) + reg);
	return (bswap32(data));
}

void
pci_conf_write(pc, tag, reg, data)
	pci_chipset_tag_t pc;
	pcitag_t tag;
	int reg;
	pcireg_t data;
{
	*((u_long *)(pci_conf_addr + pci_config_offset(tag) + reg))
		= bswap32(data);
}

/*
 * The interrupt stuff is rather ugly. On the Hades, all interrupt lines
 * for a slot are wired together and connected to IO 0,1,2 or 5 (slots:
 * (0-3) on the TT-MFP. The Pci-config code initializes the irq. number
 * to the slot position.
 */
static pci_intr_info_t iinfo[4] = { { -1 }, { -1 }, { -1 }, { -1 } };

static int	iifun __P((int, int));

static int
iifun(slot, sr)
int	slot;
int	sr;
{
	pci_intr_info_t *iinfo_p;
	int		s;

	iinfo_p = &iinfo[slot];

	/*
	 * Disable the interrupts
	 */
	MFP2->mf_imrb  &= ~iinfo_p->imask;

	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);
		(void) (iinfo_p->ifunc)(iinfo_p->iarg);
		splx(s);

		/*
		 * Re-enable interrupts after handling
		 */
		MFP2->mf_imrb |= iinfo_p->imask;
	}
	return 1;
}

void *
pci_intr_establish(pc, ih, level, ih_fun, ih_arg)
	pci_chipset_tag_t	pc;
	pci_intr_handle_t	ih;
	int			level;
	int			(*ih_fun) __P((void *));
	void			*ih_arg;
{
	pci_intr_info_t *iinfo_p;
	struct intrhand	*ihand;
	int		slot;

	slot    = ih;
	iinfo_p = &iinfo[slot];

	if (iinfo_p->ipl > 0)
	    panic("pci_intr_establish: interrupt was already established\n");

	ihand = intr_establish((slot == 3) ? 23 : 16 + slot, USER_VEC, 0,
				(hw_ifun_t)iifun, (void *)slot);
	if (ihand != NULL) {
		iinfo_p->ipl   = level;
		iinfo_p->imask = (slot == 3) ? 0x80 : (0x01 << slot);
		iinfo_p->ifunc = ih_fun;
		iinfo_p->iarg  = ih_arg;
		iinfo_p->ihand = ihand;

		/*
		 * Enable (unmask) the interrupt
		 */
		MFP2->mf_imrb |= iinfo_p->imask;
		MFP2->mf_ierb |= iinfo_p->imask;
		return(iinfo_p);
	}
	return NULL;
}

void
pci_intr_disestablish(pc, cookie)
	pci_chipset_tag_t pc;
	void *cookie;
{
	pci_intr_info_t *iinfo_p = (pci_intr_info_t *)cookie;

	if (iinfo->ipl < 0)
	    panic("pci_intr_disestablish: interrupt was not established\n");

	MFP2->mf_imrb &= ~iinfo->imask;
	MFP2->mf_ierb &= ~iinfo->imask;
	(void) intr_disestablish(iinfo_p->ihand);
	iinfo_p->ipl = -1;
}