hw/gus.c

   1 /*
   2  * QEMU Proxy for Gravis Ultrasound GF1 emulation by Tibor "TS" Schütz
   3  *
   4  * Copyright (c) 2002-2005 Vassili Karpov (malc)
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "audiodev.h"
  26 #include "audio/audio.h"
  27 #include "isa.h"
  28 #include "gusemu.h"
  29 #include "gustate.h"
  30
  31 #define dolog(...) AUD_log ("audio", __VA_ARGS__)
  32 #ifdef DEBUG
  33 #define ldebug(...) dolog (__VA_ARGS__)
  34 #else
  35 #define ldebug(...)
  36 #endif
  37
  38 #ifdef HOST_WORDS_BIGENDIAN
  39 #define GUS_ENDIANNESS 1
  40 #else
  41 #define GUS_ENDIANNESS 0
  42 #endif
  43
  44 #define IO_READ_PROTO(name) \
  45     static uint32_t name (void *opaque, uint32_t nport)
  46 #define IO_WRITE_PROTO(name) \
  47     static void name (void *opaque, uint32_t nport, uint32_t val)
  48
  49 typedef struct GUSState {
  50     ISADevice dev;
  51     GUSEmuState emu;
  52     QEMUSoundCard card;
  53     uint32_t freq;
  54     uint32_t port;
  55     int pos, left, shift, irqs;
  56     GUSsample *mixbuf;
  57     uint8_t himem[1024 * 1024 + 32 + 4096];
  58     int samples;
  59     SWVoiceOut *voice;
  60     int64_t last_ticks;
  61     qemu_irq pic;
  62 } GUSState;
  63
  64 IO_READ_PROTO (gus_readb)
  65 {
  66     GUSState *s = opaque;
  67
  68     return gus_read (&s->emu, nport, 1);
  69 }
  70
  71 IO_READ_PROTO (gus_readw)
  72 {
  73     GUSState *s = opaque;
  74
  75     return gus_read (&s->emu, nport, 2);
  76 }
  77
  78 IO_WRITE_PROTO (gus_writeb)
  79 {
  80     GUSState *s = opaque;
  81
  82     gus_write (&s->emu, nport, 1, val);
  83 }
  84
  85 IO_WRITE_PROTO (gus_writew)
  86 {
  87     GUSState *s = opaque;
  88
  89     gus_write (&s->emu, nport, 2, val);
  90 }
  91
  92 static int write_audio (GUSState *s, int samples)
  93 {
  94     int net = 0;
  95     int pos = s->pos;
  96
  97     while (samples) {
  98         int nbytes, wbytes, wsampl;
  99
 100         nbytes = samples << s->shift;
 101         wbytes = AUD_write (
 102             s->voice,
 103             s->mixbuf + (pos << (s->shift - 1)),
 104             nbytes
 105             );
 106
 107         if (wbytes) {
 108             wsampl = wbytes >> s->shift;
 109
 110             samples -= wsampl;
 111             pos = (pos + wsampl) % s->samples;
 112
 113             net += wsampl;
 114         }
 115         else {
 116             break;
 117         }
 118     }
 119
 120     return net;
 121 }
 122
 123 static void GUS_callback (void *opaque, int free)
 124 {
 125     int samples, to_play, net = 0;
 126     GUSState *s = opaque;
 127
 128     samples = free >> s->shift;
 129     to_play = audio_MIN (samples, s->left);
 130
 131     while (to_play) {
 132         int written = write_audio (s, to_play);
 133
 134         if (!written) {
 135             goto reset;
 136         }
 137
 138         s->left -= written;
 139         to_play -= written;
 140         samples -= written;
 141         net += written;
 142     }
 143
 144     samples = audio_MIN (samples, s->samples);
 145     if (samples) {
 146         gus_mixvoices (&s->emu, s->freq, samples, s->mixbuf);
 147
 148         while (samples) {
 149             int written = write_audio (s, samples);
 150             if (!written) {
 151                 break;
 152             }
 153             samples -= written;
 154             net += written;
 155         }
 156     }
 157     s->left = samples;
 158
 159  reset:
 160     gus_irqgen (&s->emu, muldiv64 (net, 1000000, s->freq));
 161 }
 162
 163 int GUS_irqrequest (GUSEmuState *emu, int hwirq, int n)
 164 {
 165     GUSState *s = emu->opaque;
 166     /* qemu_irq_lower (s->pic); */
 167     qemu_irq_raise (s->pic);
 168     s->irqs += n;
 169     ldebug ("irqrequest %d %d %d\n", hwirq, n, s->irqs);
 170     return n;
 171 }
 172
 173 void GUS_irqclear (GUSEmuState *emu, int hwirq)
 174 {
 175     GUSState *s = emu->opaque;
 176     ldebug ("irqclear %d %d\n", hwirq, s->irqs);
 177     qemu_irq_lower (s->pic);
 178     s->irqs -= 1;
 179 #ifdef IRQ_STORM
 180     if (s->irqs > 0) {
 181         qemu_irq_raise (s->pic[hwirq]);
 182     }
 183 #endif
 184 }
 185
 186 void GUS_dmarequest (GUSEmuState *der)
 187 {
 188     /* GUSState *s = (GUSState *) der; */
 189     ldebug ("dma request %d\n", der->gusdma);
 190     DMA_hold_DREQ (der->gusdma);
 191 }
 192
 193 static int GUS_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
 194 {
 195     GUSState *s = opaque;
 196     char tmpbuf[4096];
 197     int pos = dma_pos, mode, left = dma_len - dma_pos;
 198
 199     ldebug ("read DMA %#x %d\n", dma_pos, dma_len);
 200     mode = DMA_get_channel_mode (s->emu.gusdma);
 201     while (left) {
 202         int to_copy = audio_MIN ((size_t) left, sizeof (tmpbuf));
 203         int copied;
 204
 205         ldebug ("left=%d to_copy=%d pos=%d\n", left, to_copy, pos);
 206         copied = DMA_read_memory (nchan, tmpbuf, pos, to_copy);
 207         gus_dma_transferdata (&s->emu, tmpbuf, copied, left == copied);
 208         left -= copied;
 209         pos += copied;
 210     }
 211
 212     if (0 == ((mode >> 4) & 1)) {
 213         DMA_release_DREQ (s->emu.gusdma);
 214     }
 215     return dma_len;
 216 }
 217
 218 static const VMStateDescription vmstate_gus = {
 219     .name = "gus",
 220     .version_id = 2,
 221     .minimum_version_id = 2,
 222     .minimum_version_id_old = 2,
 223     .fields      = (VMStateField []) {
 224         VMSTATE_INT32(pos, GUSState),
 225         VMSTATE_INT32(left, GUSState),
 226         VMSTATE_INT32(shift, GUSState),
 227         VMSTATE_INT32(irqs, GUSState),
 228         VMSTATE_INT32(samples, GUSState),
 229         VMSTATE_INT64(last_ticks, GUSState),
 230         VMSTATE_BUFFER(himem, GUSState),
 231         VMSTATE_END_OF_LIST()
 232     }
 233 };
 234
 235 static const MemoryRegionPortio gus_portio_list1[] = {
 236     {0x000,  1, 1, .write = gus_writeb },
 237     {0x000,  1, 2, .write = gus_writew },
 238     {0x006, 10, 1, .read = gus_readb, .write = gus_writeb },
 239     {0x006, 10, 2, .read = gus_readw, .write = gus_writew },
 240     {0x100,  8, 1, .read = gus_readb, .write = gus_writeb },
 241     {0x100,  8, 2, .read = gus_readw, .write = gus_writew },
 242     PORTIO_END_OF_LIST(),
 243 };
 244
 245 static const MemoryRegionPortio gus_portio_list2[] = {
 246     {0, 1, 1, .read = gus_readb },
 247     {0, 1, 2, .read = gus_readw },
 248     PORTIO_END_OF_LIST(),
 249 };
 250
 251 static int gus_initfn (ISADevice *dev)
 252 {
 253     GUSState *s = DO_UPCAST (GUSState, dev, dev);
 254     struct audsettings as;
 255
 256     AUD_register_card ("gus", &s->card);
 257
 258     as.freq = s->freq;
 259     as.nchannels = 2;
 260     as.fmt = AUD_FMT_S16;
 261     as.endianness = GUS_ENDIANNESS;
 262
 263     s->voice = AUD_open_out (
 264         &s->card,
 265         NULL,
 266         "gus",
 267         s,
 268         GUS_callback,
 269         &as
 270         );
 271
 272     if (!s->voice) {
 273         AUD_remove_card (&s->card);
 274         return -1;
 275     }
 276
 277     s->shift = 2;
 278     s->samples = AUD_get_buffer_size_out (s->voice) >> s->shift;
 279     s->mixbuf = g_malloc0 (s->samples << s->shift);
 280
 281     isa_register_portio_list (dev, s->port, gus_portio_list1, s, "gus");
 282     isa_register_portio_list (dev, (s->port + 0x100) & 0xf00,
 283                               gus_portio_list2, s, "gus");
 284
 285     DMA_register_channel (s->emu.gusdma, GUS_read_DMA, s);
 286     s->emu.himemaddr = s->himem;
 287     s->emu.gusdatapos = s->emu.himemaddr + 1024 * 1024 + 32;
 288     s->emu.opaque = s;
 289     isa_init_irq (dev, &s->pic, s->emu.gusirq);
 290
 291     AUD_set_active_out (s->voice, 1);
 292
 293     return 0;
 294 }
 295
 296 int GUS_init (qemu_irq *pic)
 297 {
 298     isa_create_simple ("gus");
 299     return 0;
 300 }
 301
 302 static ISADeviceInfo gus_info = {
 303     .qdev.name     = "gus",
 304     .qdev.desc     = "Gravis Ultrasound GF1",
 305     .qdev.size     = sizeof (GUSState),
 306     .qdev.vmsd     = &vmstate_gus,
 307     .init          = gus_initfn,
 308     .qdev.props    = (Property[]) {
 309         DEFINE_PROP_UINT32 ("freq",    GUSState, freq,        44100),
 310         DEFINE_PROP_HEX32  ("iobase",  GUSState, port,        0x240),
 311         DEFINE_PROP_UINT32 ("irq",     GUSState, emu.gusirq,  7),
 312         DEFINE_PROP_UINT32 ("dma",     GUSState, emu.gusdma,  3),
 313         DEFINE_PROP_END_OF_LIST (),
 314     },
 315 };
 316
 317 static void gus_register (void)
 318 {
 319     isa_qdev_register (&gus_info);
 320 }
 321 device_init (gus_register)