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/irq.h"
  26 #include "hw/sysbus.h"
  27 #include "migration/vmstate.h"
  28 #include "trace.h"
  29 #include "audio/audio.h"
  30 #include "qemu/error-report.h"
  31 #include "qemu/module.h"
  32
  33 enum {
  34     R_AC97_CTRL = 0,
  35     R_AC97_ADDR,
  36     R_AC97_DATAOUT,
  37     R_AC97_DATAIN,
  38     R_D_CTRL,
  39     R_D_ADDR,
  40     R_D_REMAINING,
  41     R_RESERVED,
  42     R_U_CTRL,
  43     R_U_ADDR,
  44     R_U_REMAINING,
  45     R_MAX
  46 };
  47
  48 enum {
  49     AC97_CTRL_RQEN  = (1<<0),
  50     AC97_CTRL_WRITE = (1<<1),
  51 };
  52
  53 enum {
  54     CTRL_EN = (1<<0),
  55 };
  56
  57 #define TYPE_MILKYMIST_AC97 "milkymist-ac97"
  58 #define MILKYMIST_AC97(obj) \
  59     OBJECT_CHECK(MilkymistAC97State, (obj), TYPE_MILKYMIST_AC97)
  60
  61 struct MilkymistAC97State {
  62     SysBusDevice parent_obj;
  63
  64     MemoryRegion regs_region;
  65
  66     QEMUSoundCard card;
  67     SWVoiceIn *voice_in;
  68     SWVoiceOut *voice_out;
  69
  70     uint32_t regs[R_MAX];
  71
  72     qemu_irq crrequest_irq;
  73     qemu_irq crreply_irq;
  74     qemu_irq dmar_irq;
  75     qemu_irq dmaw_irq;
  76 };
  77 typedef struct MilkymistAC97State MilkymistAC97State;
  78
  79 static void update_voices(MilkymistAC97State *s)
  80 {
  81     if (s->regs[R_D_CTRL] & CTRL_EN) {
  82         AUD_set_active_out(s->voice_out, 1);
  83     } else {
  84         AUD_set_active_out(s->voice_out, 0);
  85     }
  86
  87     if (s->regs[R_U_CTRL] & CTRL_EN) {
  88         AUD_set_active_in(s->voice_in, 1);
  89     } else {
  90         AUD_set_active_in(s->voice_in, 0);
  91     }
  92 }
  93
  94 static uint64_t ac97_read(void *opaque, hwaddr addr,
  95                           unsigned size)
  96 {
  97     MilkymistAC97State *s = opaque;
  98     uint32_t r = 0;
  99
 100     addr >>= 2;
 101     switch (addr) {
 102     case R_AC97_CTRL:
 103     case R_AC97_ADDR:
 104     case R_AC97_DATAOUT:
 105     case R_AC97_DATAIN:
 106     case R_D_CTRL:
 107     case R_D_ADDR:
 108     case R_D_REMAINING:
 109     case R_U_CTRL:
 110     case R_U_ADDR:
 111     case R_U_REMAINING:
 112         r = s->regs[addr];
 113         break;
 114
 115     default:
 116         error_report("milkymist_ac97: read access to unknown register 0x"
 117                 TARGET_FMT_plx, addr << 2);
 118         break;
 119     }
 120
 121     trace_milkymist_ac97_memory_read(addr << 2, r);
 122
 123     return r;
 124 }
 125
 126 static void ac97_write(void *opaque, hwaddr addr, uint64_t value,
 127                        unsigned size)
 128 {
 129     MilkymistAC97State *s = opaque;
 130
 131     trace_milkymist_ac97_memory_write(addr, value);
 132
 133     addr >>= 2;
 134     switch (addr) {
 135     case R_AC97_CTRL:
 136         /* always raise an IRQ according to the direction */
 137         if (value & AC97_CTRL_RQEN) {
 138             if (value & AC97_CTRL_WRITE) {
 139                 trace_milkymist_ac97_pulse_irq_crrequest();
 140                 qemu_irq_pulse(s->crrequest_irq);
 141             } else {
 142                 trace_milkymist_ac97_pulse_irq_crreply();
 143                 qemu_irq_pulse(s->crreply_irq);
 144             }
 145         }
 146
 147         /* RQEN is self clearing */
 148         s->regs[addr] = value & ~AC97_CTRL_RQEN;
 149         break;
 150     case R_D_CTRL:
 151     case R_U_CTRL:
 152         s->regs[addr] = value;
 153         update_voices(s);
 154         break;
 155     case R_AC97_ADDR:
 156     case R_AC97_DATAOUT:
 157     case R_AC97_DATAIN:
 158     case R_D_ADDR:
 159     case R_D_REMAINING:
 160     case R_U_ADDR:
 161     case R_U_REMAINING:
 162         s->regs[addr] = value;
 163         break;
 164
 165     default:
 166         error_report("milkymist_ac97: write access to unknown register 0x"
 167                 TARGET_FMT_plx, addr);
 168         break;
 169     }
 170
 171 }
 172
 173 static const MemoryRegionOps ac97_mmio_ops = {
 174     .read = ac97_read,
 175     .write = ac97_write,
 176     .valid = {
 177         .min_access_size = 4,
 178         .max_access_size = 4,
 179     },
 180     .endianness = DEVICE_NATIVE_ENDIAN,
 181 };
 182
 183 static void ac97_in_cb(void *opaque, int avail_b)
 184 {
 185     MilkymistAC97State *s = opaque;
 186     uint8_t buf[4096];
 187     uint32_t remaining = s->regs[R_U_REMAINING];
 188     int temp = audio_MIN(remaining, avail_b);
 189     uint32_t addr = s->regs[R_U_ADDR];
 190     int transferred = 0;
 191
 192     trace_milkymist_ac97_in_cb(avail_b, remaining);
 193
 194     /* prevent from raising an IRQ */
 195     if (temp == 0) {
 196         return;
 197     }
 198
 199     while (temp) {
 200         int acquired, to_copy;
 201
 202         to_copy = audio_MIN(temp, sizeof(buf));
 203         acquired = AUD_read(s->voice_in, buf, to_copy);
 204         if (!acquired) {
 205             break;
 206         }
 207
 208         cpu_physical_memory_write(addr, buf, acquired);
 209
 210         temp -= acquired;
 211         addr += acquired;
 212         transferred += acquired;
 213     }
 214
 215     trace_milkymist_ac97_in_cb_transferred(transferred);
 216
 217     s->regs[R_U_ADDR] = addr;
 218     s->regs[R_U_REMAINING] -= transferred;
 219
 220     if ((s->regs[R_U_CTRL] & CTRL_EN) && (s->regs[R_U_REMAINING] == 0)) {
 221         trace_milkymist_ac97_pulse_irq_dmaw();
 222         qemu_irq_pulse(s->dmaw_irq);
 223     }
 224 }
 225
 226 static void ac97_out_cb(void *opaque, int free_b)
 227 {
 228     MilkymistAC97State *s = opaque;
 229     uint8_t buf[4096];
 230     uint32_t remaining = s->regs[R_D_REMAINING];
 231     int temp = audio_MIN(remaining, free_b);
 232     uint32_t addr = s->regs[R_D_ADDR];
 233     int transferred = 0;
 234
 235     trace_milkymist_ac97_out_cb(free_b, remaining);
 236
 237     /* prevent from raising an IRQ */
 238     if (temp == 0) {
 239         return;
 240     }
 241
 242     while (temp) {
 243         int copied, to_copy;
 244
 245         to_copy = audio_MIN(temp, sizeof(buf));
 246         cpu_physical_memory_read(addr, buf, to_copy);
 247         copied = AUD_write(s->voice_out, buf, to_copy);
 248         if (!copied) {
 249             break;
 250         }
 251         temp -= copied;
 252         addr += copied;
 253         transferred += copied;
 254     }
 255
 256     trace_milkymist_ac97_out_cb_transferred(transferred);
 257
 258     s->regs[R_D_ADDR] = addr;
 259     s->regs[R_D_REMAINING] -= transferred;
 260
 261     if ((s->regs[R_D_CTRL] & CTRL_EN) && (s->regs[R_D_REMAINING] == 0)) {
 262         trace_milkymist_ac97_pulse_irq_dmar();
 263         qemu_irq_pulse(s->dmar_irq);
 264     }
 265 }
 266
 267 static void milkymist_ac97_reset(DeviceState *d)
 268 {
 269     MilkymistAC97State *s = MILKYMIST_AC97(d);
 270     int i;
 271
 272     for (i = 0; i < R_MAX; i++) {
 273         s->regs[i] = 0;
 274     }
 275
 276     AUD_set_active_in(s->voice_in, 0);
 277     AUD_set_active_out(s->voice_out, 0);
 278 }
 279
 280 static int ac97_post_load(void *opaque, int version_id)
 281 {
 282     MilkymistAC97State *s = opaque;
 283
 284     update_voices(s);
 285
 286     return 0;
 287 }
 288
 289 static void milkymist_ac97_init(Object *obj)
 290 {
 291     MilkymistAC97State *s = MILKYMIST_AC97(obj);
 292     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 293
 294     sysbus_init_irq(dev, &s->crrequest_irq);
 295     sysbus_init_irq(dev, &s->crreply_irq);
 296     sysbus_init_irq(dev, &s->dmar_irq);
 297     sysbus_init_irq(dev, &s->dmaw_irq);
 298
 299     memory_region_init_io(&s->regs_region, obj, &ac97_mmio_ops, s,
 300             "milkymist-ac97", R_MAX * 4);
 301     sysbus_init_mmio(dev, &s->regs_region);
 302 }
 303
 304 static void milkymist_ac97_realize(DeviceState *dev, Error **errp)
 305 {
 306     MilkymistAC97State *s = MILKYMIST_AC97(dev);
 307     struct audsettings as;
 308
 309     AUD_register_card("Milkymist AC'97", &s->card);
 310
 311     as.freq = 48000;
 312     as.nchannels = 2;
 313     as.fmt = AUDIO_FORMAT_S16;
 314     as.endianness = 1;
 315
 316     s->voice_in = AUD_open_in(&s->card, s->voice_in,
 317             "mm_ac97.in", s, ac97_in_cb, &as);
 318     s->voice_out = AUD_open_out(&s->card, s->voice_out,
 319             "mm_ac97.out", s, ac97_out_cb, &as);
 320 }
 321
 322 static const VMStateDescription vmstate_milkymist_ac97 = {
 323     .name = "milkymist-ac97",
 324     .version_id = 1,
 325     .minimum_version_id = 1,
 326     .post_load = ac97_post_load,
 327     .fields = (VMStateField[]) {
 328         VMSTATE_UINT32_ARRAY(regs, MilkymistAC97State, R_MAX),
 329         VMSTATE_END_OF_LIST()
 330     }
 331 };
 332
 333 static void milkymist_ac97_class_init(ObjectClass *klass, void *data)
 334 {
 335     DeviceClass *dc = DEVICE_CLASS(klass);
 336
 337     dc->realize = milkymist_ac97_realize;
 338     dc->reset = milkymist_ac97_reset;
 339     dc->vmsd = &vmstate_milkymist_ac97;
 340 }
 341
 342 static const TypeInfo milkymist_ac97_info = {
 343     .name          = TYPE_MILKYMIST_AC97,
 344     .parent        = TYPE_SYS_BUS_DEVICE,
 345     .instance_size = sizeof(MilkymistAC97State),
 346     .instance_init = milkymist_ac97_init,
 347     .class_init    = milkymist_ac97_class_init,
 348 };
 349
 350 static void milkymist_ac97_register_types(void)
 351 {
 352     type_register_static(&milkymist_ac97_info);
 353 }
 354
 355 type_init(milkymist_ac97_register_types)