qemu-e2k/hw/gus.c

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/*
* QEMU Proxy for Gravis Ultrasound GF1 emulation by Tibor "TS" Schütz
*
* Copyright (c) 2002-2005 Vassili Karpov (malc)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "hw.h"
#include "audiodev.h"
#include "audio/audio.h"
#include "isa.h"
#include "gusemu.h"
#include "gustate.h"
#define dolog(...) AUD_log ("audio", __VA_ARGS__)
#ifdef DEBUG
#define ldebug(...) dolog (__VA_ARGS__)
#else
#define ldebug(...)
#endif
#ifdef WORDS_BIGENDIAN
#define GUS_ENDIANNESS 1
#else
#define GUS_ENDIANNESS 0
#endif
#define IO_READ_PROTO(name) \
uint32_t name (void *opaque, uint32_t nport)
#define IO_WRITE_PROTO(name) \
void name (void *opaque, uint32_t nport, uint32_t val)
static struct {
int port;
int irq;
int dma;
int freq;
} conf = {0x240, 7, 3, 44100};
typedef struct GUSState {
GUSEmuState emu;
QEMUSoundCard card;
int freq;
int pos, left, shift, irqs;
GUSsample *mixbuf;
uint8_t himem[1024 * 1024 + 32 + 4096];
int samples;
SWVoiceOut *voice;
int64_t last_ticks;
qemu_irq *pic;
} GUSState;
IO_READ_PROTO (gus_readb)
{
GUSState *s = opaque;
return gus_read (&s->emu, nport, 1);
}
IO_READ_PROTO (gus_readw)
{
GUSState *s = opaque;
return gus_read (&s->emu, nport, 2);
}
IO_WRITE_PROTO (gus_writeb)
{
GUSState *s = opaque;
gus_write (&s->emu, nport, 1, val);
}
IO_WRITE_PROTO (gus_writew)
{
GUSState *s = opaque;
gus_write (&s->emu, nport, 2, val);
}
static int write_audio (GUSState *s, int samples)
{
int net = 0;
int pos = s->pos;
while (samples) {
int nbytes, wbytes, wsampl;
nbytes = samples << s->shift;
wbytes = AUD_write (
s->voice,
s->mixbuf + (pos << (s->shift - 1)),
nbytes
);
if (wbytes) {
wsampl = wbytes >> s->shift;
samples -= wsampl;
pos = (pos + wsampl) % s->samples;
net += wsampl;
}
else {
break;
}
}
return net;
}
static void GUS_callback (void *opaque, int free)
{
int samples, to_play, net = 0;
GUSState *s = opaque;
samples = free >> s->shift;
to_play = audio_MIN (samples, s->left);
while (to_play) {
int written = write_audio (s, to_play);
if (!written) {
goto reset;
}
s->left -= written;
to_play -= written;
samples -= written;
net += written;
}
samples = audio_MIN (samples, s->samples);
if (samples) {
gus_mixvoices (&s->emu, s->freq, samples, s->mixbuf);
while (samples) {
int written = write_audio (s, samples);
if (!written) {
break;
}
samples -= written;
net += written;
}
}
s->left = samples;
reset:
gus_irqgen (&s->emu, (double) (net * 1000000) / s->freq);
}
int GUS_irqrequest (GUSEmuState *emu, int hwirq, int n)
{
GUSState *s = emu->opaque;
/* qemu_irq_lower (s->pic[hwirq]); */
qemu_irq_raise (s->pic[hwirq]);
s->irqs += n;
ldebug ("irqrequest %d %d %d\n", hwirq, n, s->irqs);
return n;
}
void GUS_irqclear (GUSEmuState *emu, int hwirq)
{
GUSState *s = emu->opaque;
ldebug ("irqclear %d %d\n", hwirq, s->irqs);
qemu_irq_lower (s->pic[hwirq]);
s->irqs -= 1;
#ifdef IRQ_STORM
if (s->irqs > 0) {
qemu_irq_raise (s->pic[hwirq]);
}
#endif
}
void GUS_dmarequest (GUSEmuState *der)
{
/* GUSState *s = (GUSState *) der; */
ldebug ("dma request %d\n", der->gusdma);
DMA_hold_DREQ (der->gusdma);
}
int GUS_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
{
GUSState *s = opaque;
char tmpbuf[4096];
int pos = dma_pos, mode, left = dma_len - dma_pos;
ldebug ("read DMA %#x %d\n", dma_pos, dma_len);
mode = DMA_get_channel_mode (s->emu.gusdma);
while (left) {
int to_copy = audio_MIN ((size_t) left, sizeof (tmpbuf));
int copied;
ldebug ("left=%d to_copy=%d pos=%d\n", left, to_copy, pos);
copied = DMA_read_memory (nchan, tmpbuf, pos, to_copy);
gus_dma_transferdata (&s->emu, tmpbuf, copied, left == copied);
left -= copied;
pos += copied;
}
if (0 == ((mode >> 4) & 1)) {
DMA_release_DREQ (s->emu.gusdma);
}
return dma_len;
}
static void GUS_save (QEMUFile *f, void *opaque)
{
GUSState *s = opaque;
qemu_put_be32 (f, s->pos);
qemu_put_be32 (f, s->left);
qemu_put_be32 (f, s->shift);
qemu_put_be32 (f, s->irqs);
qemu_put_be32 (f, s->samples);
qemu_put_be64 (f, s->last_ticks);
qemu_put_buffer (f, s->himem, sizeof (s->himem));
}
static int GUS_load (QEMUFile *f, void *opaque, int version_id)
{
GUSState *s = opaque;
if (version_id != 2)
return -EINVAL;
s->pos = qemu_get_be32 (f);
s->left = qemu_get_be32 (f);
s->shift = qemu_get_be32 (f);
s->irqs = qemu_get_be32 (f);
s->samples = qemu_get_be32 (f);
s->last_ticks = qemu_get_be64 (f);
qemu_get_buffer (f, s->himem, sizeof (s->himem));
return 0;
}
int GUS_init (AudioState *audio, qemu_irq *pic)
{
GUSState *s;
audsettings_t as;
if (!audio) {
dolog ("No audio state\n");
return -1;
}
s = qemu_mallocz (sizeof (*s));
if (!s) {
dolog ("Could not allocate memory for GUS (%zu bytes)\n",
sizeof (*s));
return -1;
}
AUD_register_card (audio, "gus", &s->card);
as.freq = conf.freq;
as.nchannels = 2;
as.fmt = AUD_FMT_S16;
as.endianness = GUS_ENDIANNESS;
s->voice = AUD_open_out (
&s->card,
NULL,
"gus",
s,
GUS_callback,
&as
);
if (!s->voice) {
AUD_remove_card (&s->card);
qemu_free (s);
return -1;
}
s->shift = 2;
s->samples = AUD_get_buffer_size_out (s->voice) >> s->shift;
s->mixbuf = qemu_mallocz (s->samples << s->shift);
if (!s->mixbuf) {
AUD_close_out (&s->card, s->voice);
AUD_remove_card (&s->card);
qemu_free (s);
return -1;
}
register_ioport_write (conf.port, 1, 1, gus_writeb, s);
register_ioport_write (conf.port, 1, 2, gus_writew, s);
register_ioport_read ((conf.port + 0x100) & 0xf00, 1, 1, gus_readb, s);
register_ioport_read ((conf.port + 0x100) & 0xf00, 1, 2, gus_readw, s);
register_ioport_write (conf.port + 6, 10, 1, gus_writeb, s);
register_ioport_write (conf.port + 6, 10, 2, gus_writew, s);
register_ioport_read (conf.port + 6, 10, 1, gus_readb, s);
register_ioport_read (conf.port + 6, 10, 2, gus_readw, s);
register_ioport_write (conf.port + 0x100, 8, 1, gus_writeb, s);
register_ioport_write (conf.port + 0x100, 8, 2, gus_writew, s);
register_ioport_read (conf.port + 0x100, 8, 1, gus_readb, s);
register_ioport_read (conf.port + 0x100, 8, 2, gus_readw, s);
DMA_register_channel (conf.dma, GUS_read_DMA, s);
s->emu.gusirq = conf.irq;
s->emu.gusdma = conf.dma;
s->emu.himemaddr = s->himem;
s->emu.gusdatapos = s->emu.himemaddr + 1024 * 1024 + 32;
s->emu.opaque = s;
s->freq = conf.freq;
s->pic = pic;
AUD_set_active_out (s->voice, 1);
register_savevm ("gus", 0, 2, GUS_save, GUS_load, s);
return 0;
}