221 lines
5.6 KiB
C
221 lines
5.6 KiB
C
/* $NetBSD: wdc_mb.c,v 1.1 1998/04/10 10:37:12 leo Exp $ */
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/*
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* Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved.
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*
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* DMA and multi-sector PIO handling are derived from code contributed by
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* Onno van der Linden.
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*
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* ISA attachment created by Christopher G. Demetriou.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles M. Hannum.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <machine/cpu.h>
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#include <machine/bus.h>
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#include <machine/iomap.h>
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#include <machine/mfp.h>
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#include <machine/dma.h>
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#include <dev/ic/wdcvar.h>
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#include <m68k/asm_single.h>
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#include <atari/dev/ym2149reg.h>
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#include <atari/atari/device.h>
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/*
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* XXX This code currently doesn't even try to allow 32-bit data port use.
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*/
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static int claim_hw __P((void *, int));
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static void free_hw __P((void *));
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struct wdc_mb_softc {
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struct wdc_softc sc_wdcdev;
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struct wdc_attachment_data sc_ad;
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void *sc_ih;
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};
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int wdc_mb_probe __P((struct device *, struct cfdata *, void *));
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void wdc_mb_attach __P((struct device *, struct device *, void *));
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struct cfattach wdc_mb_ca = {
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sizeof(struct wdc_mb_softc), wdc_mb_probe, wdc_mb_attach
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};
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int
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wdc_mb_probe(parent, cfp, aux)
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struct device *parent;
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struct cfdata *cfp;
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void *aux;
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{
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#if 0 /* XXX memset */
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struct wdc_attachment_data ad = { 0 };
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#else /* XXX memset */
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struct wdc_attachment_data ad;
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#endif /* XXX memset */
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int result = 0;
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u_char sv_ierb;
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#if 0 /* XXX memset */
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#else /* XXX memset */
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bzero(&ad, sizeof ad);
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#endif /* XXX memset */
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if ((machineid & ATARI_TT) || strcmp("wdc", aux) || cfp->cf_unit != 0)
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return 0;
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if (!atari_realconfig)
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return 0;
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ad.iot = ad.auxiot = mb_alloc_bus_space_tag();
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if (ad.iot == NULL)
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return 0;
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ad.iot->stride = 2;
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ad.iot->wo_1 = 1;
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if (bus_space_map(ad.iot, 0xfff00000, 0x40, 0, &ad.ioh))
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return 0;
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if (bus_space_subregion(ad.iot, ad.ioh, 0x38, 1, &ad.auxioh))
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return 0;
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/*
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* Make sure IDE interrupts are disabled during probing.
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*/
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sv_ierb = MFP->mf_ierb;
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MFP->mf_ierb &= ~IB_DINT;
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/*
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* Make sure that IDE is turned on on the Falcon.
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*/
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if (machineid & ATARI_FALCON)
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ym2149_ser2(0);
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result = wdcprobe(&ad);
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MFP->mf_ierb = sv_ierb;
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bus_space_unmap(ad.iot, ad.ioh, 0x40);
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mb_free_bus_space_tag(ad.iot);
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return (result);
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}
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void
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wdc_mb_attach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct wdc_mb_softc *sc = (void *)self;
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printf("\n");
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sc->sc_ad.iot = sc->sc_ad.auxiot = mb_alloc_bus_space_tag();
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sc->sc_ad.iot->stride = 2;
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sc->sc_ad.iot->wo_1 = 1;
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if (bus_space_map(sc->sc_ad.iot, 0xfff00000, 0x40, 0,
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&sc->sc_ad.ioh)) {
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printf("%s: couldn't map registers\n",
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sc->sc_wdcdev.sc_dev.dv_xname);
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return;
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}
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if (bus_space_subregion(sc->sc_ad.iot, sc->sc_ad.ioh, 0x38, 1,
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&sc->sc_ad.auxioh))
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return;
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/*
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* Play a nasty trick here. Normally we only manipulate the
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* interrupt *mask*. However to defeat wd_get_parms(), we
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* disable the interrupts here using the *enable* register.
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*/
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MFP->mf_ierb &= ~IB_DINT;
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/*
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* XXX: Is this true on all atari's??
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*/
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sc->sc_wdcdev.sc_flags |= WDCF_SINGLE;
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sc->sc_ad.cap |= WDC_CAPABILITY_HWLOCK;
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sc->sc_ad.claim_hw = &claim_hw;
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sc->sc_ad.free_hw = &free_hw;
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wdcattach(&sc->sc_wdcdev, &sc->sc_ad);
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/*
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* Setup & enable disk related interrupts.
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*/
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MFP->mf_ierb |= IB_DINT;
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MFP->mf_iprb &= ~IB_DINT;
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MFP->mf_imrb |= IB_DINT;
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}
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/*
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* Hardware locking
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*/
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static int wd_lock;
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static int
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claim_hw(softc, maysleep)
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void *softc;
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int maysleep;
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{
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void wdcrestart __P((void *));
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if (wd_lock != DMA_LOCK_GRANT) {
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if (wd_lock == DMA_LOCK_REQ) {
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/*
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* ST_DMA access is being claimed.
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*/
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return 0;
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}
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if (!st_dmagrab((dma_farg)wdcintr,
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(dma_farg)(maysleep ? NULL : wdcrestart), softc,
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&wd_lock, 1))
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return 0;
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}
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return 1;
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}
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static void
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free_hw(softc)
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void *softc;
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{
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/*
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* Flush pending interrupts before giving-up lock
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*/
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single_inst_bclr_b(MFP->mf_iprb, IB_DINT);
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/*
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* Only free the lock on a Falcon. On the Hades, keep it.
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*/
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/* if (machineid & ATARI_FALCON) */
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st_dmafree(softc, &wd_lock);
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}
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