hw/audio/milkymist-ac97.c

   1 /*
   2  *  QEMU model of the Milkymist System Controller.
   3  *
   4  *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  *
  20  * Specification available at:
  21  *   http://milkymist.walle.cc/socdoc/ac97.pdf
  22  */
  23
  24 #include "qemu/osdep.h"
  25 #include "hw/hw.h"
  26 #include "hw/sysbus.h"
  27 #include "trace.h"
  28 #include "audio/audio.h"
  29 #include "qemu/error-report.h"
  30 #include "qemu/module.h"
  31
  32 enum {
  33     R_AC97_CTRL = 0,
  34     R_AC97_ADDR,
  35     R_AC97_DATAOUT,
  36     R_AC97_DATAIN,
  37     R_D_CTRL,
  38     R_D_ADDR,
  39     R_D_REMAINING,
  40     R_RESERVED,
  41     R_U_CTRL,
  42     R_U_ADDR,
  43     R_U_REMAINING,
  44     R_MAX
  45 };
  46
  47 enum {
  48     AC97_CTRL_RQEN  = (1<<0),
  49     AC97_CTRL_WRITE = (1<<1),
  50 };
  51
  52 enum {
  53     CTRL_EN = (1<<0),
  54 };
  55
  56 #define TYPE_MILKYMIST_AC97 "milkymist-ac97"
  57 #define MILKYMIST_AC97(obj) \
  58     OBJECT_CHECK(MilkymistAC97State, (obj), TYPE_MILKYMIST_AC97)
  59
  60 struct MilkymistAC97State {
  61     SysBusDevice parent_obj;
  62
  63     MemoryRegion regs_region;
  64
  65     QEMUSoundCard card;
  66     SWVoiceIn *voice_in;
  67     SWVoiceOut *voice_out;
  68
  69     uint32_t regs[R_MAX];
  70
  71     qemu_irq crrequest_irq;
  72     qemu_irq crreply_irq;
  73     qemu_irq dmar_irq;
  74     qemu_irq dmaw_irq;
  75 };
  76 typedef struct MilkymistAC97State MilkymistAC97State;
  77
  78 static void update_voices(MilkymistAC97State *s)
  79 {
  80     if (s->regs[R_D_CTRL] & CTRL_EN) {
  81         AUD_set_active_out(s->voice_out, 1);
  82     } else {
  83         AUD_set_active_out(s->voice_out, 0);
  84     }
  85
  86     if (s->regs[R_U_CTRL] & CTRL_EN) {
  87         AUD_set_active_in(s->voice_in, 1);
  88     } else {
  89         AUD_set_active_in(s->voice_in, 0);
  90     }
  91 }
  92
  93 static uint64_t ac97_read(void *opaque, hwaddr addr,
  94                           unsigned size)
  95 {
  96     MilkymistAC97State *s = opaque;
  97     uint32_t r = 0;
  98
  99     addr >>= 2;
 100     switch (addr) {
 101     case R_AC97_CTRL:
 102     case R_AC97_ADDR:
 103     case R_AC97_DATAOUT:
 104     case R_AC97_DATAIN:
 105     case R_D_CTRL:
 106     case R_D_ADDR:
 107     case R_D_REMAINING:
 108     case R_U_CTRL:
 109     case R_U_ADDR:
 110     case R_U_REMAINING:
 111         r = s->regs[addr];
 112         break;
 113
 114     default:
 115         error_report("milkymist_ac97: read access to unknown register 0x"
 116                 TARGET_FMT_plx, addr << 2);
 117         break;
 118     }
 119
 120     trace_milkymist_ac97_memory_read(addr << 2, r);
 121
 122     return r;
 123 }
 124
 125 static void ac97_write(void *opaque, hwaddr addr, uint64_t value,
 126                        unsigned size)
 127 {
 128     MilkymistAC97State *s = opaque;
 129
 130     trace_milkymist_ac97_memory_write(addr, value);
 131
 132     addr >>= 2;
 133     switch (addr) {
 134     case R_AC97_CTRL:
 135         /* always raise an IRQ according to the direction */
 136         if (value & AC97_CTRL_RQEN) {
 137             if (value & AC97_CTRL_WRITE) {
 138                 trace_milkymist_ac97_pulse_irq_crrequest();
 139                 qemu_irq_pulse(s->crrequest_irq);
 140             } else {
 141                 trace_milkymist_ac97_pulse_irq_crreply();
 142                 qemu_irq_pulse(s->crreply_irq);
 143             }
 144         }
 145
 146         /* RQEN is self clearing */
 147         s->regs[addr] = value & ~AC97_CTRL_RQEN;
 148         break;
 149     case R_D_CTRL:
 150     case R_U_CTRL:
 151         s->regs[addr] = value;
 152         update_voices(s);
 153         break;
 154     case R_AC97_ADDR:
 155     case R_AC97_DATAOUT:
 156     case R_AC97_DATAIN:
 157     case R_D_ADDR:
 158     case R_D_REMAINING:
 159     case R_U_ADDR:
 160     case R_U_REMAINING:
 161         s->regs[addr] = value;
 162         break;
 163
 164     default:
 165         error_report("milkymist_ac97: write access to unknown register 0x"
 166                 TARGET_FMT_plx, addr);
 167         break;
 168     }
 169
 170 }
 171
 172 static const MemoryRegionOps ac97_mmio_ops = {
 173     .read = ac97_read,
 174     .write = ac97_write,
 175     .valid = {
 176         .min_access_size = 4,
 177         .max_access_size = 4,
 178     },
 179     .endianness = DEVICE_NATIVE_ENDIAN,
 180 };
 181
 182 static void ac97_in_cb(void *opaque, int avail_b)
 183 {
 184     MilkymistAC97State *s = opaque;
 185     uint8_t buf[4096];
 186     uint32_t remaining = s->regs[R_U_REMAINING];
 187     int temp = audio_MIN(remaining, avail_b);
 188     uint32_t addr = s->regs[R_U_ADDR];
 189     int transferred = 0;
 190
 191     trace_milkymist_ac97_in_cb(avail_b, remaining);
 192
 193     /* prevent from raising an IRQ */
 194     if (temp == 0) {
 195         return;
 196     }
 197
 198     while (temp) {
 199         int acquired, to_copy;
 200
 201         to_copy = audio_MIN(temp, sizeof(buf));
 202         acquired = AUD_read(s->voice_in, buf, to_copy);
 203         if (!acquired) {
 204             break;
 205         }
 206
 207         cpu_physical_memory_write(addr, buf, acquired);
 208
 209         temp -= acquired;
 210         addr += acquired;
 211         transferred += acquired;
 212     }
 213
 214     trace_milkymist_ac97_in_cb_transferred(transferred);
 215
 216     s->regs[R_U_ADDR] = addr;
 217     s->regs[R_U_REMAINING] -= transferred;
 218
 219     if ((s->regs[R_U_CTRL] & CTRL_EN) && (s->regs[R_U_REMAINING] == 0)) {
 220         trace_milkymist_ac97_pulse_irq_dmaw();
 221         qemu_irq_pulse(s->dmaw_irq);
 222     }
 223 }
 224
 225 static void ac97_out_cb(void *opaque, int free_b)
 226 {
 227     MilkymistAC97State *s = opaque;
 228     uint8_t buf[4096];
 229     uint32_t remaining = s->regs[R_D_REMAINING];
 230     int temp = audio_MIN(remaining, free_b);
 231     uint32_t addr = s->regs[R_D_ADDR];
 232     int transferred = 0;
 233
 234     trace_milkymist_ac97_out_cb(free_b, remaining);
 235
 236     /* prevent from raising an IRQ */
 237     if (temp == 0) {
 238         return;
 239     }
 240
 241     while (temp) {
 242         int copied, to_copy;
 243
 244         to_copy = audio_MIN(temp, sizeof(buf));
 245         cpu_physical_memory_read(addr, buf, to_copy);
 246         copied = AUD_write(s->voice_out, buf, to_copy);
 247         if (!copied) {
 248             break;
 249         }
 250         temp -= copied;
 251         addr += copied;
 252         transferred += copied;
 253     }
 254
 255     trace_milkymist_ac97_out_cb_transferred(transferred);
 256
 257     s->regs[R_D_ADDR] = addr;
 258     s->regs[R_D_REMAINING] -= transferred;
 259
 260     if ((s->regs[R_D_CTRL] & CTRL_EN) && (s->regs[R_D_REMAINING] == 0)) {
 261         trace_milkymist_ac97_pulse_irq_dmar();
 262         qemu_irq_pulse(s->dmar_irq);
 263     }
 264 }
 265
 266 static void milkymist_ac97_reset(DeviceState *d)
 267 {
 268     MilkymistAC97State *s = MILKYMIST_AC97(d);
 269     int i;
 270
 271     for (i = 0; i < R_MAX; i++) {
 272         s->regs[i] = 0;
 273     }
 274
 275     AUD_set_active_in(s->voice_in, 0);
 276     AUD_set_active_out(s->voice_out, 0);
 277 }
 278
 279 static int ac97_post_load(void *opaque, int version_id)
 280 {
 281     MilkymistAC97State *s = opaque;
 282
 283     update_voices(s);
 284
 285     return 0;
 286 }
 287
 288 static void milkymist_ac97_init(Object *obj)
 289 {
 290     MilkymistAC97State *s = MILKYMIST_AC97(obj);
 291     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 292
 293     sysbus_init_irq(dev, &s->crrequest_irq);
 294     sysbus_init_irq(dev, &s->crreply_irq);
 295     sysbus_init_irq(dev, &s->dmar_irq);
 296     sysbus_init_irq(dev, &s->dmaw_irq);
 297
 298     memory_region_init_io(&s->regs_region, obj, &ac97_mmio_ops, s,
 299             "milkymist-ac97", R_MAX * 4);
 300     sysbus_init_mmio(dev, &s->regs_region);
 301 }
 302
 303 static void milkymist_ac97_realize(DeviceState *dev, Error **errp)
 304 {
 305     MilkymistAC97State *s = MILKYMIST_AC97(dev);
 306     struct audsettings as;
 307
 308     AUD_register_card("Milkymist AC'97", &s->card);
 309
 310     as.freq = 48000;
 311     as.nchannels = 2;
 312     as.fmt = AUDIO_FORMAT_S16;
 313     as.endianness = 1;
 314
 315     s->voice_in = AUD_open_in(&s->card, s->voice_in,
 316             "mm_ac97.in", s, ac97_in_cb, &as);
 317     s->voice_out = AUD_open_out(&s->card, s->voice_out,
 318             "mm_ac97.out", s, ac97_out_cb, &as);
 319 }
 320
 321 static const VMStateDescription vmstate_milkymist_ac97 = {
 322     .name = "milkymist-ac97",
 323     .version_id = 1,
 324     .minimum_version_id = 1,
 325     .post_load = ac97_post_load,
 326     .fields = (VMStateField[]) {
 327         VMSTATE_UINT32_ARRAY(regs, MilkymistAC97State, R_MAX),
 328         VMSTATE_END_OF_LIST()
 329     }
 330 };
 331
 332 static void milkymist_ac97_class_init(ObjectClass *klass, void *data)
 333 {
 334     DeviceClass *dc = DEVICE_CLASS(klass);
 335
 336     dc->realize = milkymist_ac97_realize;
 337     dc->reset = milkymist_ac97_reset;
 338     dc->vmsd = &vmstate_milkymist_ac97;
 339 }
 340
 341 static const TypeInfo milkymist_ac97_info = {
 342     .name          = TYPE_MILKYMIST_AC97,
 343     .parent        = TYPE_SYS_BUS_DEVICE,
 344     .instance_size = sizeof(MilkymistAC97State),
 345     .instance_init = milkymist_ac97_init,
 346     .class_init    = milkymist_ac97_class_init,
 347 };
 348
 349 static void milkymist_ac97_register_types(void)
 350 {
 351     type_register_static(&milkymist_ac97_info);
 352 }
 353
 354 type_init(milkymist_ac97_register_types)