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

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1998-04-10 14:37:04 +04:00
/* $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);
}