/* $NetBSD: cms.c,v 1.23 2019/05/08 13:40:18 isaki Exp $ */

/*
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* 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.
*
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cms.c,v 1.23 2019/05/08 13:40:18 isaki Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/select.h>

#include <sys/bus.h>

#include <sys/audioio.h>
#include <dev/audio/audio_if.h>

#include <sys/midiio.h>
#include <dev/midi_if.h>
#include <dev/midivar.h>
#include <dev/midisynvar.h>

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#include <dev/isa/cmsreg.h>

#ifdef AUDIO_DEBUG
#define DPRINTF(x)      if (cmsdebug) printf x
int     cmsdebug = 0;
#else
#define DPRINTF(x)
#endif

struct cms_softc {
       kmutex_t sc_lock;

       bus_space_tag_t sc_iot;
       bus_space_handle_t sc_ioh;

       /* shadow registers for each chip */
       u_int8_t sc_shadowregs[32*2];
       midisyn sc_midisyn;
};

int     cms_probe(device_t, cfdata_t, void *);
void    cms_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(cms, sizeof(struct cms_softc),
   cms_probe, cms_attach, NULL, NULL);

int     cms_open(midisyn *, int);
void    cms_close(midisyn *);
void    cms_on(midisyn *, uint_fast16_t, midipitch_t, int16_t);
void    cms_off(midisyn *, uint_fast16_t, uint_fast8_t);

struct midisyn_methods midi_cms_hw = {
       .open     = cms_open,
       .close    = cms_close,
       .attackv  = cms_on,
       .releasev = cms_off,
};

static void cms_reset(struct cms_softc *);

static char cms_note_table[] = {
       /* A  */ 3,
       /* A# */ 31,
       /* B  */ 58,
       /* C  */ 83,
       /* C# */ 107,
       /* D  */ 130,
       /* D# */ 151,
       /* E  */ 172,
       /* F  */ 191,
       /* F# */ 209,
       /* G  */ 226,
       /* G# */ 242,
};

#define NOTE_TO_OCTAVE(note) (((note)-CMS_FIRST_NOTE)/12)
#define NOTE_TO_COUNT(note) cms_note_table[(((note)-CMS_FIRST_NOTE)%12)]

int
cms_probe(device_t parent, cfdata_t match, void *aux)
{
       struct isa_attach_args *ia = aux;
       bus_space_tag_t iot;
       bus_space_handle_t ioh;
       int found = 0;
       int i;

       DPRINTF(("cms_probe():\n"));

       iot = ia->ia_iot;

       if (ia->ia_nio < 1)
               return 0;

       if (ISA_DIRECT_CONFIG(ia))
               return 0;

       if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
               return 0;

       if (bus_space_map(iot, ia->ia_io[0].ir_addr, CMS_IOSIZE, 0, &ioh))
               return 0;

       bus_space_write_1(iot, ioh, CMS_WREG, 0xaa);
       if (bus_space_read_1(iot, ioh, CMS_RREG) != 0xaa)
               goto out;

       for (i = 0; i < 8; i++) {
               if (bus_space_read_1(iot, ioh, CMS_MREG) != 0x7f)
                       goto out;
       }
       found = 1;

       ia->ia_nio = 1;
       ia->ia_io[0].ir_size = CMS_IOSIZE;

       ia->ia_niomem = 0;
       ia->ia_nirq = 0;
       ia->ia_ndrq = 0;

out:
       bus_space_unmap(iot, ioh, CMS_IOSIZE);

       return found;
}


void
cms_attach(device_t parent, device_t self, void *aux)
{
       struct cms_softc *sc = device_private(self);
       struct isa_attach_args *ia = aux;
       bus_space_tag_t iot;
       bus_space_handle_t ioh;
       midisyn *ms;

       mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_AUDIO);

       aprint_normal("\n");

       DPRINTF(("cms_attach():\n"));

       iot = ia->ia_iot;

       if (bus_space_map(iot, ia->ia_io[0].ir_addr, CMS_IOSIZE, 0, &ioh)) {
               aprint_error_dev(self, "can't map i/o space\n");
               return;
       }

       sc->sc_iot = iot;
       sc->sc_ioh = ioh;

       /* now let's reset the chips */
       cms_reset(sc);

       /* init the synthesiser */
       ms = &sc->sc_midisyn;
       ms->mets = &midi_cms_hw;
       strcpy(ms->name, "Creative Music System");
       ms->nvoice = CMS_NVOICES;
       ms->data = sc;
       ms->lock = &sc->sc_lock;
       midisyn_init(ms);

       /* and attach the midi device with the synthesiser */
       midi_attach_mi(&midisyn_hw_if, ms, self);
}


int
cms_open(midisyn *ms, int flag)
{
       struct cms_softc *sc = (struct cms_softc *)ms->data;

       cms_reset(sc);

       return 0;
}

void
cms_close(midisyn *ms)
{
       struct cms_softc *sc = (struct cms_softc *)ms->data;

       cms_reset(sc);
}

void
cms_on(midisyn *ms, uint_fast16_t vidx, midipitch_t mp, int16_t level_cB)
{
       struct cms_softc *sc = (struct cms_softc *)ms->data;
       int chip = CHAN_TO_CHIP(vidx);
       int voice = CHAN_TO_VOICE(vidx);
       uint32_t note;
       u_int8_t octave;
       u_int8_t count;
       u_int8_t reg;
       u_int8_t vol;

       /*
        * The next line is a regrettable hack, because it drops all pitch
        * adjustment midisyn has supplied in miditune, so this synth will
        * not respond to tuning, pitchbend, etc. It seems it ought to be
        * possible to DTRT if the formula that generated the cms_note_table
        * can be found, but I've had no luck, and a plot of the numbers in
        * the table clearly curves the wrong way to be derived any obvious
        * way from the equal tempered scale. (Or maybe the table's wrong?
        * Has this device been playing flat up the scale? I don't have
        * access to one to try.)
        */
       note = MIDIPITCH_TO_KEY(mp);

       if (note < CMS_FIRST_NOTE)
               return;

       octave = NOTE_TO_OCTAVE(note);
       count = NOTE_TO_COUNT(note);

       DPRINTF(("chip=%d voice=%d octave=%d count=%d offset=%d shift=%d\n",
               chip, voice, octave, count, OCTAVE_OFFSET(voice),
               OCTAVE_SHIFT(voice)));

       /* write the count */
       CMS_WRITE(sc, chip, CMS_IREG_FREQ0 + voice, count);

       /* select the octave */
       reg = CMS_READ(sc, chip, CMS_IREG_OCTAVE_1_0 + OCTAVE_OFFSET(voice));
       reg &= ~(0x0f<<OCTAVE_SHIFT(voice));
       reg |= ((octave&0x7)<<OCTAVE_SHIFT(voice));
       CMS_WRITE(sc, chip, CMS_IREG_OCTAVE_1_0 + OCTAVE_OFFSET(voice), reg);

       /* set the volume */
       /* this may be the wrong curve but will do something. no docs! */
       vol = 15 + ((level_cB > -75) ? level_cB/5 : -15);
       CMS_WRITE(sc, chip, CMS_IREG_VOL0 + voice, ((vol<<4)|vol));

       /* enable the voice */
       reg = CMS_READ(sc, chip, CMS_IREG_FREQ_CTL);
       reg |= (1<<voice);
       CMS_WRITE(sc, chip, CMS_IREG_FREQ_CTL, reg);
}

void
cms_off(midisyn *ms, uint_fast16_t vidx, uint_fast8_t vel)
{
       struct cms_softc *sc = (struct cms_softc *)ms->data;
       int chip = CHAN_TO_CHIP(vidx);
       int voice = CHAN_TO_VOICE(vidx);
       u_int8_t reg;

       /* disable the channel */
       reg = CMS_READ(sc, chip, CMS_IREG_FREQ_CTL);
       reg &= ~(1<<voice);
       CMS_WRITE(sc, chip, CMS_IREG_FREQ_CTL, reg);
}

static void
cms_reset(struct cms_softc *sc)
{
       int i;

       DPRINTF(("cms_reset():\n"));

       for (i = 0; i < 6; i++) {
               CMS_WRITE(sc, 0, CMS_IREG_VOL0+i, 0x00);
               CMS_WRITE(sc, 1, CMS_IREG_VOL0+i, 0x00);

               CMS_WRITE(sc, 0, CMS_IREG_FREQ0+i, 0x00);
               CMS_WRITE(sc, 1, CMS_IREG_FREQ0+i, 0x00);
       }

       for (i = 0; i < 3; i++) {
               CMS_WRITE(sc, 0, CMS_IREG_OCTAVE_1_0+i, 0x00);
               CMS_WRITE(sc, 1, CMS_IREG_OCTAVE_1_0+i, 0x00);
       }

       CMS_WRITE(sc, 0, CMS_IREG_FREQ_CTL, 0x00);
       CMS_WRITE(sc, 1, CMS_IREG_FREQ_CTL, 0x00);

       CMS_WRITE(sc, 0, CMS_IREG_NOISE_CTL, 0x00);
       CMS_WRITE(sc, 1, CMS_IREG_NOISE_CTL, 0x00);

       CMS_WRITE(sc, 0, CMS_IREG_NOISE_BW, 0x00);
       CMS_WRITE(sc, 1, CMS_IREG_NOISE_BW, 0x00);

       /*
        * These registers don't appear to be useful, but must be
        * cleared otherwise certain voices don't work properly
        */
       CMS_WRITE(sc, 0, 0x18, 0x00);
       CMS_WRITE(sc, 1, 0x18, 0x00);
       CMS_WRITE(sc, 0, 0x19, 0x00);
       CMS_WRITE(sc, 1, 0x19, 0x00);

       CMS_WRITE(sc, 0, CMS_IREG_SYS_CTL, CMS_IREG_SYS_RESET);
       CMS_WRITE(sc, 1, CMS_IREG_SYS_CTL, CMS_IREG_SYS_RESET);

       CMS_WRITE(sc, 0, CMS_IREG_SYS_CTL, CMS_IREG_SYS_ENBL);
       CMS_WRITE(sc, 1, CMS_IREG_SYS_CTL, CMS_IREG_SYS_ENBL);
}

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