hw/audio/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/hw.h"
  25 #include "hw/audio/audio.h"
  26 #include "audio/audio.h"
  27 #include "hw/isa/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 TYPE_GUS "gus"
  45 #define GUS(obj) OBJECT_CHECK (GUSState, (obj), TYPE_GUS)
  46
  47 typedef struct GUSState {
  48     ISADevice dev;
  49     GUSEmuState emu;
  50     QEMUSoundCard card;
  51     uint32_t freq;
  52     uint32_t port;
  53     int pos, left, shift, irqs;
  54     GUSsample *mixbuf;
  55     uint8_t himem[1024 * 1024 + 32 + 4096];
  56     int samples;
  57     SWVoiceOut *voice;
  58     int64_t last_ticks;
  59     qemu_irq pic;
  60 } GUSState;
  61
  62 static uint32_t gus_readb(void *opaque, uint32_t nport)
  63 {
  64     GUSState *s = opaque;
  65
  66     return gus_read (&s->emu, nport, 1);
  67 }
  68
  69 static void gus_writeb(void *opaque, uint32_t nport, uint32_t val)
  70 {
  71     GUSState *s = opaque;
  72
  73     gus_write (&s->emu, nport, 1, val);
  74 }
  75
  76 static int write_audio (GUSState *s, int samples)
  77 {
  78     int net = 0;
  79     int pos = s->pos;
  80
  81     while (samples) {
  82         int nbytes, wbytes, wsampl;
  83
  84         nbytes = samples << s->shift;
  85         wbytes = AUD_write (
  86             s->voice,
  87             s->mixbuf + (pos << (s->shift - 1)),
  88             nbytes
  89             );
  90
  91         if (wbytes) {
  92             wsampl = wbytes >> s->shift;
  93
  94             samples -= wsampl;
  95             pos = (pos + wsampl) % s->samples;
  96
  97             net += wsampl;
  98         }
  99         else {
 100             break;
 101         }
 102     }
 103
 104     return net;
 105 }
 106
 107 static void GUS_callback (void *opaque, int free)
 108 {
 109     int samples, to_play, net = 0;
 110     GUSState *s = opaque;
 111
 112     samples = free >> s->shift;
 113     to_play = audio_MIN (samples, s->left);
 114
 115     while (to_play) {
 116         int written = write_audio (s, to_play);
 117
 118         if (!written) {
 119             goto reset;
 120         }
 121
 122         s->left -= written;
 123         to_play -= written;
 124         samples -= written;
 125         net += written;
 126     }
 127
 128     samples = audio_MIN (samples, s->samples);
 129     if (samples) {
 130         gus_mixvoices (&s->emu, s->freq, samples, s->mixbuf);
 131
 132         while (samples) {
 133             int written = write_audio (s, samples);
 134             if (!written) {
 135                 break;
 136             }
 137             samples -= written;
 138             net += written;
 139         }
 140     }
 141     s->left = samples;
 142
 143  reset:
 144     gus_irqgen (&s->emu, muldiv64 (net, 1000000, s->freq));
 145 }
 146
 147 int GUS_irqrequest (GUSEmuState *emu, int hwirq, int n)
 148 {
 149     GUSState *s = emu->opaque;
 150     /* qemu_irq_lower (s->pic); */
 151     qemu_irq_raise (s->pic);
 152     s->irqs += n;
 153     ldebug ("irqrequest %d %d %d\n", hwirq, n, s->irqs);
 154     return n;
 155 }
 156
 157 void GUS_irqclear (GUSEmuState *emu, int hwirq)
 158 {
 159     GUSState *s = emu->opaque;
 160     ldebug ("irqclear %d %d\n", hwirq, s->irqs);
 161     qemu_irq_lower (s->pic);
 162     s->irqs -= 1;
 163 #ifdef IRQ_STORM
 164     if (s->irqs > 0) {
 165         qemu_irq_raise (s->pic[hwirq]);
 166     }
 167 #endif
 168 }
 169
 170 void GUS_dmarequest (GUSEmuState *der)
 171 {
 172     /* GUSState *s = (GUSState *) der; */
 173     ldebug ("dma request %d\n", der->gusdma);
 174     DMA_hold_DREQ (der->gusdma);
 175 }
 176
 177 static int GUS_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
 178 {
 179     GUSState *s = opaque;
 180     char tmpbuf[4096];
 181     int pos = dma_pos, mode, left = dma_len - dma_pos;
 182
 183     ldebug ("read DMA %#x %d\n", dma_pos, dma_len);
 184     mode = DMA_get_channel_mode (s->emu.gusdma);
 185     while (left) {
 186         int to_copy = audio_MIN ((size_t) left, sizeof (tmpbuf));
 187         int copied;
 188
 189         ldebug ("left=%d to_copy=%d pos=%d\n", left, to_copy, pos);
 190         copied = DMA_read_memory (nchan, tmpbuf, pos, to_copy);
 191         gus_dma_transferdata (&s->emu, tmpbuf, copied, left == copied);
 192         left -= copied;
 193         pos += copied;
 194     }
 195
 196     if (((mode >> 4) & 1) == 0) {
 197         DMA_release_DREQ (s->emu.gusdma);
 198     }
 199     return dma_len;
 200 }
 201
 202 static const VMStateDescription vmstate_gus = {
 203     .name = "gus",
 204     .version_id = 2,
 205     .minimum_version_id = 2,
 206     .fields = (VMStateField[]) {
 207         VMSTATE_INT32 (pos, GUSState),
 208         VMSTATE_INT32 (left, GUSState),
 209         VMSTATE_INT32 (shift, GUSState),
 210         VMSTATE_INT32 (irqs, GUSState),
 211         VMSTATE_INT32 (samples, GUSState),
 212         VMSTATE_INT64 (last_ticks, GUSState),
 213         VMSTATE_BUFFER (himem, GUSState),
 214         VMSTATE_END_OF_LIST ()
 215     }
 216 };
 217
 218 static const MemoryRegionPortio gus_portio_list1[] = {
 219     {0x000,  1, 1, .write = gus_writeb },
 220     {0x006, 10, 1, .read = gus_readb, .write = gus_writeb },
 221     {0x100,  8, 1, .read = gus_readb, .write = gus_writeb },
 222     PORTIO_END_OF_LIST (),
 223 };
 224
 225 static const MemoryRegionPortio gus_portio_list2[] = {
 226     {0, 2, 1, .read = gus_readb },
 227     PORTIO_END_OF_LIST (),
 228 };
 229
 230 static void gus_realizefn (DeviceState *dev, Error **errp)
 231 {
 232     ISADevice *d = ISA_DEVICE(dev);
 233     GUSState *s = GUS (dev);
 234     struct audsettings as;
 235
 236     AUD_register_card ("gus", &s->card);
 237
 238     as.freq = s->freq;
 239     as.nchannels = 2;
 240     as.fmt = AUD_FMT_S16;
 241     as.endianness = GUS_ENDIANNESS;
 242
 243     s->voice = AUD_open_out (
 244         &s->card,
 245         NULL,
 246         "gus",
 247         s,
 248         GUS_callback,
 249         &as
 250         );
 251
 252     if (!s->voice) {
 253         AUD_remove_card (&s->card);
 254         error_setg(errp, "No voice");
 255         return;
 256     }
 257
 258     s->shift = 2;
 259     s->samples = AUD_get_buffer_size_out (s->voice) >> s->shift;
 260     s->mixbuf = g_malloc0 (s->samples << s->shift);
 261
 262     isa_register_portio_list (d, s->port, gus_portio_list1, s, "gus");
 263     isa_register_portio_list (d, (s->port + 0x100) & 0xf00,
 264                               gus_portio_list2, s, "gus");
 265
 266     DMA_register_channel (s->emu.gusdma, GUS_read_DMA, s);
 267     s->emu.himemaddr = s->himem;
 268     s->emu.gusdatapos = s->emu.himemaddr + 1024 * 1024 + 32;
 269     s->emu.opaque = s;
 270     isa_init_irq (d, &s->pic, s->emu.gusirq);
 271
 272     AUD_set_active_out (s->voice, 1);
 273 }
 274
 275 static int GUS_init (ISABus *bus)
 276 {
 277     isa_create_simple (bus, TYPE_GUS);
 278     return 0;
 279 }
 280
 281 static Property gus_properties[] = {
 282     DEFINE_PROP_UINT32 ("freq",    GUSState, freq,        44100),
 283     DEFINE_PROP_UINT32 ("iobase",  GUSState, port,        0x240),
 284     DEFINE_PROP_UINT32 ("irq",     GUSState, emu.gusirq,  7),
 285     DEFINE_PROP_UINT32 ("dma",     GUSState, emu.gusdma,  3),
 286     DEFINE_PROP_END_OF_LIST (),
 287 };
 288
 289 static void gus_class_initfn (ObjectClass *klass, void *data)
 290 {
 291     DeviceClass *dc = DEVICE_CLASS (klass);
 292
 293     dc->realize = gus_realizefn;
 294     set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
 295     dc->desc = "Gravis Ultrasound GF1";
 296     dc->vmsd = &vmstate_gus;
 297     dc->props = gus_properties;
 298 }
 299
 300 static const TypeInfo gus_info = {
 301     .name          = TYPE_GUS,
 302     .parent        = TYPE_ISA_DEVICE,
 303     .instance_size = sizeof (GUSState),
 304     .class_init    = gus_class_initfn,
 305 };
 306
 307 static void gus_register_types (void)
 308 {
 309     type_register_static (&gus_info);
 310     isa_register_soundhw("gus", "Gravis Ultrasound GF1", GUS_init);
 311 }
 312
 313 type_init (gus_register_types)