NetBSD/sys/arch/atari/dev/wdc_mb.c

/*	$NetBSD: wdc_mb.c,v 1.1 1998/04/10 10:37:12 leo Exp $	*/

/*
 * Copyright (c) 1994, 1995 Charles M. Hannum.  All rights reserved.
 *
 * DMA and multi-sector PIO handling are derived from code contributed by
 * Onno van der Linden.
 *
 * ISA attachment created by Christopher G. Demetriou.
 *
 * 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/cpu.h>
#include <machine/bus.h>
#include <machine/iomap.h>
#include <machine/mfp.h>
#include <machine/dma.h>

#include <dev/ic/wdcvar.h>

#include <m68k/asm_single.h>

#include <atari/dev/ym2149reg.h>
#include <atari/atari/device.h>

/*
 * XXX This code currently doesn't even try to allow 32-bit data port use.
 */
static int	claim_hw __P((void *, int));
static void	free_hw __P((void *));

struct wdc_mb_softc {
	struct wdc_softc sc_wdcdev;
	struct wdc_attachment_data sc_ad;
	void	*sc_ih;
};

int	wdc_mb_probe	__P((struct device *, struct cfdata *, void *));
void	wdc_mb_attach	__P((struct device *, struct device *, void *));

struct cfattach wdc_mb_ca = {
	sizeof(struct wdc_mb_softc), wdc_mb_probe, wdc_mb_attach
};

int
wdc_mb_probe(parent, cfp, aux)
	struct device *parent;
	struct cfdata *cfp;
	void *aux;
{
#if 0 /* XXX memset */
	struct wdc_attachment_data ad = { 0 };
#else /* XXX memset */
	struct wdc_attachment_data ad;
#endif /* XXX memset */
	int	result = 0;
	u_char	sv_ierb;

#if 0 /* XXX memset */
#else /* XXX memset */
	bzero(&ad, sizeof ad);
#endif /* XXX memset */

	if ((machineid & ATARI_TT) || strcmp("wdc", aux) || cfp->cf_unit != 0)
		return 0;
	if (!atari_realconfig)
		return 0;

	ad.iot = ad.auxiot = mb_alloc_bus_space_tag();
	if (ad.iot == NULL)
		return 0;
	ad.iot->stride = 2;
	ad.iot->wo_1   = 1;

	if (bus_space_map(ad.iot, 0xfff00000, 0x40, 0, &ad.ioh))
		return 0;
	if (bus_space_subregion(ad.iot, ad.ioh, 0x38, 1, &ad.auxioh))
		return 0;

	/*
	 * Make sure IDE interrupts are disabled during probing.
	 */
	sv_ierb = MFP->mf_ierb;
	MFP->mf_ierb &= ~IB_DINT;

	/*
	 * Make sure that IDE is turned on on the Falcon.
	 */
	if (machineid & ATARI_FALCON)
		ym2149_ser2(0);

	result = wdcprobe(&ad);

	MFP->mf_ierb = sv_ierb;

	bus_space_unmap(ad.iot, ad.ioh, 0x40);
	mb_free_bus_space_tag(ad.iot);

	return (result);
}

void
wdc_mb_attach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct wdc_mb_softc *sc = (void *)self;

	printf("\n");

	sc->sc_ad.iot = sc->sc_ad.auxiot = mb_alloc_bus_space_tag();
	sc->sc_ad.iot->stride = 2;
	sc->sc_ad.iot->wo_1   = 1;
	if (bus_space_map(sc->sc_ad.iot, 0xfff00000, 0x40, 0,
			  &sc->sc_ad.ioh)) {
		printf("%s: couldn't map registers\n",
		    sc->sc_wdcdev.sc_dev.dv_xname);
		return;
	}
	if (bus_space_subregion(sc->sc_ad.iot, sc->sc_ad.ioh, 0x38, 1,
				&sc->sc_ad.auxioh))
		return;

	/*
	 * Play a nasty trick here. Normally we only manipulate the
	 * interrupt *mask*. However to defeat wd_get_parms(), we
	 * disable the interrupts here using the *enable* register.
	 */
	MFP->mf_ierb &= ~IB_DINT;

	/*
	 * XXX: Is this true on all atari's??
	 */
	sc->sc_wdcdev.sc_flags |= WDCF_SINGLE;

	sc->sc_ad.cap |= WDC_CAPABILITY_HWLOCK;
	sc->sc_ad.claim_hw = &claim_hw;
	sc->sc_ad.free_hw  = &free_hw;

	wdcattach(&sc->sc_wdcdev, &sc->sc_ad);

	/*
	 * Setup & enable disk related interrupts.
	 */
	MFP->mf_ierb  |= IB_DINT;
	MFP->mf_iprb  &= ~IB_DINT;
	MFP->mf_imrb  |= IB_DINT;
}

/*
 * Hardware locking
 */
static int	wd_lock;

static int
claim_hw(softc, maysleep)
void *softc;
int  maysleep;
{
	void wdcrestart __P((void *));

	if (wd_lock != DMA_LOCK_GRANT) {
		if (wd_lock == DMA_LOCK_REQ) {
			/*
			 * ST_DMA access is being claimed.
			 */
			return 0;
		}
		if (!st_dmagrab((dma_farg)wdcintr,
		    (dma_farg)(maysleep ? NULL : wdcrestart), softc,
		    &wd_lock, 1))
			return 0;
	}
	return 1;	
}

static void
free_hw(softc)
void *softc;
{
	/*
	 * Flush pending interrupts before giving-up lock
	 */
	single_inst_bclr_b(MFP->mf_iprb, IB_DINT);

	/*
	 * Only free the lock on a Falcon. On the Hades, keep it.
	 */
/*	if (machineid & ATARI_FALCON) */
		st_dmafree(softc, &wd_lock);
}