NetBSD-5.0.2/sys/dev/isa/cms.c
/* $NetBSD: cms.c,v 1.18 2008/04/28 20:23:52 martin 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 1.18 2008/04/28 20:23:52 martin 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_if.h>
#include <dev/audiovar.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 {
struct midi_softc sc_mididev;
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;
struct audio_attach_args arg;
sc->sc_mididev.dev = self;
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);
ms = &sc->sc_midisyn;
ms->mets = &midi_cms_hw;
strcpy(ms->name, "Creative Music System");
ms->nvoice = CMS_NVOICES;
ms->data = sc;
/* use the synthesiser */
midisyn_attach(&sc->sc_mididev, ms);
/* now attach the midi device to the synthesiser */
arg.type = AUDIODEV_TYPE_MIDI;
arg.hwif = sc->sc_mididev.hw_if;
arg.hdl = sc->sc_mididev.hw_hdl;
config_found(self, &arg, 0);
}
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);
}