FreeBSD/Linux Kernel Cross Reference
sys/dev/isa/gus_isapnp.c

     /*      $OpenBSD: gus_isapnp.c,v 1.10 2022/04/06 18:59:28 naddy Exp $   */
     /*      $NetBSD: gus.c,v 1.51 1998/01/25 23:48:06 mycroft Exp $ */
     
     /*-
      * Copyright (c) 1996 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Ken Hornstein and John Kohl.
     *
     * 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.
     */
    
    /*
     *
     * TODO:
     *      . figure out why mixer activity while sound is playing causes problems
     *        (phantom interrupts?)
     *      . figure out a better deinterleave strategy that avoids sucking up
     *        CPU, memory and cache bandwidth.  (Maybe a special encoding?
     *        Maybe use the double-speed sampling/hardware deinterleave trick
     *        from the GUS SDK?)  A 486/33 isn't quite fast enough to keep
     *        up with 44.1kHz 16-bit stereo output without some drop-outs.
     *      . use CS4231 for 16-bit sampling, for a-law and mu-law playback.
     *      . actually test full-duplex sampling(recording) and playback.
     */
    
    /*
     * Gravis UltraSound driver
     *
     * For more detailed information, see the GUS developers' kit
     * available on the net at:
     *
     * ftp://freedom.nmsu.edu/pub/ultrasound/gravis/util/
     *      gusdkXXX.zip (developers' kit--get rev 2.22 or later)
     *              See ultrawrd.doc inside--it's MS Word (ick), but it's the bible
     *
     */
    
    /*
     * The GUS Max has a slightly strange set of connections between the CS4231
     * and the GF1 and the DMA interconnects.  It's set up so that the CS4231 can
     * be playing while the GF1 is loading patches from the system.
     *
     * Here's a recreation of the DMA interconnect diagram:
     *
     *       GF1
     *   +---------+                                 digital
     *   |         |  record                         ASIC
     *   |         |--------------+
     *   |         |              |                +--------+
     *   |         | play (dram)  |      +----+    |        |
     *   |         |--------------(------|-\  |    |   +-+  |
     *   +---------+              |      |  >-|----|---|C|--|------  dma chan 1
     *                            |  +---|-/  |    |   +-+  |
     *                            |  |   +----+    |    |   |
     *                            |  |   +----+    |    |   |
     *   +---------+        +-+   +--(---|-\  |    |    |   |
     *   |         | play   |8|      |   |  >-|----|----+---|------  dma chan 2
     *   | ---C----|--------|/|------(---|-/  |    |        |
     *   |    ^    |record  |1|      |   +----+    |        |
     *   |    |    |   /----|6|------+             +--------+
     *   | ---+----|--/     +-+
     *   +---------+
     *     CS4231   8-to-16 bit bus conversion, if needed
     *
     *
     * "C" is an optional combiner.
     *
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/errno.h>
    #include <sys/ioctl.h>
    #include <sys/syslog.h>
    #include <sys/device.h>
    #include <sys/buf.h>
    #include <sys/fcntl.h>
    #include <sys/malloc.h>
   #include <sys/kernel.h>
   #include <sys/timeout.h>
   
   #include <machine/cpu.h>
   #include <machine/intr.h>
   #include <machine/bus.h>
   #include <machine/cpufunc.h>
   #include <sys/audioio.h>
   #include <dev/audio_if.h>
   
   #include <dev/isa/isavar.h>
   #include <dev/isa/isadmavar.h>
   
   #include <dev/ic/ics2101reg.h>
   #include <dev/ic/cs4231reg.h>
   #include <dev/ic/ad1848reg.h>
   #include <dev/isa/ics2101var.h>
   #include <dev/isa/ad1848var.h>
   #include <dev/isa/cs4231var.h>
   #include "gusreg.h"
   #include "gusvar.h"
   
   int     gus_isapnp_match(struct device *, void *, void *);
   void    gus_isapnp_attach(struct device *, struct device *, void *);
   
   const struct cfattach gus_isapnp_ca = {
           sizeof(struct gus_softc), gus_isapnp_match, gus_isapnp_attach
   };
   
   /*
    * Probe for the GUS hardware.
    */
   int
   gus_isapnp_match(struct device *parent, void *match, void *aux)
   {
           return 1;
   }
   
   void
   gus_isapnp_attach(struct device *parent, struct device *self, void *aux)
   {
           struct gus_softc *sc = (void *) self;
           struct isa_attach_args *ipa = aux;
   
           sc->sc_iot = ipa->ia_iot;
           sc->sc_iobase = ipa->ia_iobase;
   
           sc->sc_ioh1 = ipa->ipa_io[0].h;         /* p2xr */
           sc->sc_ioh2 = ipa->ipa_io[1].h;         /* p3xr */
           sc->sc_ioh3 = ipa->ipa_io[2].h;         /* codec/mixer */
           sc->sc_ioh4 = (bus_space_handle_t)NULL; /* midi */
   
           sc->sc_irq = ipa->ipa_irq[0].num;
           sc->sc_drq = ipa->ipa_drq[1].num;
           sc->sc_recdrq = ipa->ipa_drq[0].num;
           sc->sc_isa = parent->dv_parent;
   
           gus_subattach(sc, ipa);
   }

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