hw/audio/pl041.c

   1 /*
   2  * Arm PrimeCell PL041 Advanced Audio Codec Interface
   3  *
   4  * Copyright (c) 2011
   5  * Written by Mathieu Sonet - www.elasticsheep.com
   6  *
   7  * This code is licensed under the GPL.
   8  *
   9  * *****************************************************************
  10  *
  11  * This driver emulates the ARM AACI interface
  12  * connected to a LM4549 codec.
  13  *
  14  * Limitations:
  15  * - Supports only a playback on one channel (Versatile/Vexpress)
  16  * - Supports only one TX FIFO in compact-mode or non-compact mode.
  17  * - Supports playback of 12, 16, 18 and 20 bits samples.
  18  * - Record is not supported.
  19  * - The PL041 is hardwired to a LM4549 codec.
  20  *
  21  */
  22
  23 #include "qemu/osdep.h"
  24 #include "hw/irq.h"
  25 #include "hw/qdev-properties.h"
  26 #include "hw/sysbus.h"
  27 #include "qemu/log.h"
  28 #include "qemu/module.h"
  29
  30 #include "pl041.h"
  31 #include "lm4549.h"
  32 #include "migration/vmstate.h"
  33 #include "qom/object.h"
  34
  35 #if 0
  36 #define PL041_DEBUG_LEVEL 1
  37 #endif
  38
  39 #if defined(PL041_DEBUG_LEVEL) && (PL041_DEBUG_LEVEL >= 1)
  40 #define DBG_L1(fmt, ...) \
  41 do { printf("pl041: " fmt , ## __VA_ARGS__); } while (0)
  42 #else
  43 #define DBG_L1(fmt, ...) \
  44 do { } while (0)
  45 #endif
  46
  47 #if defined(PL041_DEBUG_LEVEL) && (PL041_DEBUG_LEVEL >= 2)
  48 #define DBG_L2(fmt, ...) \
  49 do { printf("pl041: " fmt , ## __VA_ARGS__); } while (0)
  50 #else
  51 #define DBG_L2(fmt, ...) \
  52 do { } while (0)
  53 #endif
  54
  55
  56 #define MAX_FIFO_DEPTH      (1024)
  57 #define DEFAULT_FIFO_DEPTH  (8)
  58
  59 #define SLOT1_RW    (1 << 19)
  60
  61 /* This FIFO only stores 20-bit samples on 32-bit words.
  62    So its level is independent of the selected mode */
  63 typedef struct {
  64     uint32_t level;
  65     uint32_t data[MAX_FIFO_DEPTH];
  66 } pl041_fifo;
  67
  68 typedef struct {
  69     pl041_fifo tx_fifo;
  70     uint8_t tx_enabled;
  71     uint8_t tx_compact_mode;
  72     uint8_t tx_sample_size;
  73
  74     pl041_fifo rx_fifo;
  75     uint8_t rx_enabled;
  76     uint8_t rx_compact_mode;
  77     uint8_t rx_sample_size;
  78 } pl041_channel;
  79
  80 #define TYPE_PL041 "pl041"
  81 OBJECT_DECLARE_SIMPLE_TYPE(PL041State, PL041)
  82
  83 struct PL041State {
  84     SysBusDevice parent_obj;
  85
  86     MemoryRegion iomem;
  87     qemu_irq irq;
  88
  89     uint32_t fifo_depth; /* FIFO depth in non-compact mode */
  90
  91     pl041_regfile regs;
  92     pl041_channel fifo1;
  93     lm4549_state codec;
  94 };
  95
  96
  97 static const unsigned char pl041_default_id[8] = {
  98     0x41, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1
  99 };
 100
 101 #if defined(PL041_DEBUG_LEVEL)
 102 #define REGISTER(name, offset) #name,
 103 static const char *pl041_regs_name[] = {
 104     #include "pl041.hx"
 105 };
 106 #undef REGISTER
 107 #endif
 108
 109
 110 #if defined(PL041_DEBUG_LEVEL)
 111 static const char *get_reg_name(hwaddr offset)
 112 {
 113     if (offset <= PL041_dr1_7) {
 114         return pl041_regs_name[offset >> 2];
 115     }
 116
 117     return "unknown";
 118 }
 119 #endif
 120
 121 static uint8_t pl041_compute_periphid3(PL041State *s)
 122 {
 123     uint8_t id3 = 1; /* One channel */
 124
 125     /* Add the fifo depth information */
 126     switch (s->fifo_depth) {
 127     case 8:
 128         id3 |= 0 << 3;
 129         break;
 130     case 32:
 131         id3 |= 1 << 3;
 132         break;
 133     case 64:
 134         id3 |= 2 << 3;
 135         break;
 136     case 128:
 137         id3 |= 3 << 3;
 138         break;
 139     case 256:
 140         id3 |= 4 << 3;
 141         break;
 142     case 512:
 143         id3 |= 5 << 3;
 144         break;
 145     case 1024:
 146         id3 |= 6 << 3;
 147         break;
 148     case 2048:
 149         id3 |= 7 << 3;
 150         break;
 151     }
 152
 153     return id3;
 154 }
 155
 156 static void pl041_reset(PL041State *s)
 157 {
 158     DBG_L1("pl041_reset\n");
 159
 160     memset(&s->regs, 0x00, sizeof(pl041_regfile));
 161
 162     s->regs.slfr = SL1TXEMPTY | SL2TXEMPTY | SL12TXEMPTY;
 163     s->regs.sr1 = TXFE | RXFE | TXHE;
 164     s->regs.isr1 = 0;
 165
 166     memset(&s->fifo1, 0x00, sizeof(s->fifo1));
 167 }
 168
 169
 170 static void pl041_fifo1_write(PL041State *s, uint32_t value)
 171 {
 172     pl041_channel *channel = &s->fifo1;
 173     pl041_fifo *fifo = &s->fifo1.tx_fifo;
 174
 175     /* Push the value in the FIFO */
 176     if (channel->tx_compact_mode == 0) {
 177         /* Non-compact mode */
 178
 179         if (fifo->level < s->fifo_depth) {
 180             /* Pad the value with 0 to obtain a 20-bit sample */
 181             switch (channel->tx_sample_size) {
 182             case 12:
 183                 value = (value << 8) & 0xFFFFF;
 184                 break;
 185             case 16:
 186                 value = (value << 4) & 0xFFFFF;
 187                 break;
 188             case 18:
 189                 value = (value << 2) & 0xFFFFF;
 190                 break;
 191             case 20:
 192             default:
 193                 break;
 194             }
 195
 196             /* Store the sample in the FIFO */
 197             fifo->data[fifo->level++] = value;
 198         }
 199 #if defined(PL041_DEBUG_LEVEL)
 200         else {
 201             DBG_L1("fifo1 write: overrun\n");
 202         }
 203 #endif
 204     } else {
 205         /* Compact mode */
 206
 207         if ((fifo->level + 2) < s->fifo_depth) {
 208             uint32_t i = 0;
 209             uint32_t sample = 0;
 210
 211             for (i = 0; i < 2; i++) {
 212                 sample = value & 0xFFFF;
 213                 value = value >> 16;
 214
 215                 /* Pad each sample with 0 to obtain a 20-bit sample */
 216                 switch (channel->tx_sample_size) {
 217                 case 12:
 218                     sample = sample << 8;
 219                     break;
 220                 case 16:
 221                 default:
 222                     sample = sample << 4;
 223                     break;
 224                 }
 225
 226                 /* Store the sample in the FIFO */
 227                 fifo->data[fifo->level++] = sample;
 228             }
 229         }
 230 #if defined(PL041_DEBUG_LEVEL)
 231         else {
 232             DBG_L1("fifo1 write: overrun\n");
 233         }
 234 #endif
 235     }
 236
 237     /* Update the status register */
 238     if (fifo->level > 0) {
 239         s->regs.sr1 &= ~(TXUNDERRUN | TXFE);
 240     }
 241
 242     if (fifo->level >= (s->fifo_depth / 2)) {
 243         s->regs.sr1 &= ~TXHE;
 244     }
 245
 246     if (fifo->level >= s->fifo_depth) {
 247         s->regs.sr1 |= TXFF;
 248     }
 249
 250     DBG_L2("fifo1_push sr1 = 0x%08x\n", s->regs.sr1);
 251 }
 252
 253 static void pl041_fifo1_transmit(PL041State *s)
 254 {
 255     pl041_channel *channel = &s->fifo1;
 256     pl041_fifo *fifo = &s->fifo1.tx_fifo;
 257     uint32_t slots = s->regs.txcr1 & TXSLOT_MASK;
 258     uint32_t written_samples;
 259
 260     /* Check if FIFO1 transmit is enabled */
 261     if ((channel->tx_enabled) && (slots & (TXSLOT3 | TXSLOT4))) {
 262         if (fifo->level >= (s->fifo_depth / 2)) {
 263             int i;
 264
 265             DBG_L1("Transfer FIFO level = %i\n", fifo->level);
 266
 267             /* Try to transfer the whole FIFO */
 268             for (i = 0; i < (fifo->level / 2); i++) {
 269                 uint32_t left = fifo->data[i * 2];
 270                 uint32_t right = fifo->data[i * 2 + 1];
 271
 272                  /* Transmit two 20-bit samples to the codec */
 273                 if (lm4549_write_samples(&s->codec, left, right) == 0) {
 274                     DBG_L1("Codec buffer full\n");
 275                     break;
 276                 }
 277             }
 278
 279             written_samples = i * 2;
 280             if (written_samples > 0) {
 281                 /* Update the FIFO level */
 282                 fifo->level -= written_samples;
 283
 284                 /* Move back the pending samples to the start of the FIFO */
 285                 for (i = 0; i < fifo->level; i++) {
 286                     fifo->data[i] = fifo->data[written_samples + i];
 287                 }
 288
 289                 /* Update the status register */
 290                 s->regs.sr1 &= ~TXFF;
 291
 292                 if (fifo->level <= (s->fifo_depth / 2)) {
 293                     s->regs.sr1 |= TXHE;
 294                 }
 295
 296                 if (fifo->level == 0) {
 297                     s->regs.sr1 |= TXFE | TXUNDERRUN;
 298                     DBG_L1("Empty FIFO\n");
 299                 }
 300             }
 301         }
 302     }
 303 }
 304
 305 static void pl041_isr1_update(PL041State *s)
 306 {
 307     /* Update ISR1 */
 308     if (s->regs.sr1 & TXUNDERRUN) {
 309         s->regs.isr1 |= URINTR;
 310     } else {
 311         s->regs.isr1 &= ~URINTR;
 312     }
 313
 314     if (s->regs.sr1 & TXHE) {
 315         s->regs.isr1 |= TXINTR;
 316     } else {
 317         s->regs.isr1 &= ~TXINTR;
 318     }
 319
 320     if (!(s->regs.sr1 & TXBUSY) && (s->regs.sr1 & TXFE)) {
 321         s->regs.isr1 |= TXCINTR;
 322     } else {
 323         s->regs.isr1 &= ~TXCINTR;
 324     }
 325
 326     /* Update the irq state */
 327     qemu_set_irq(s->irq, ((s->regs.isr1 & s->regs.ie1) > 0) ? 1 : 0);
 328     DBG_L2("Set interrupt sr1 = 0x%08x isr1 = 0x%08x masked = 0x%08x\n",
 329            s->regs.sr1, s->regs.isr1, s->regs.isr1 & s->regs.ie1);
 330 }
 331
 332 static void pl041_request_data(void *opaque)
 333 {
 334     PL041State *s = (PL041State *)opaque;
 335
 336     /* Trigger pending transfers */
 337     pl041_fifo1_transmit(s);
 338     pl041_isr1_update(s);
 339 }
 340
 341 static uint64_t pl041_read(void *opaque, hwaddr offset,
 342                                 unsigned size)
 343 {
 344     PL041State *s = (PL041State *)opaque;
 345     int value;
 346
 347     if ((offset >= PL041_periphid0) && (offset <= PL041_pcellid3)) {
 348         if (offset == PL041_periphid3) {
 349             value = pl041_compute_periphid3(s);
 350         } else {
 351             value = pl041_default_id[(offset - PL041_periphid0) >> 2];
 352         }
 353
 354         DBG_L1("pl041_read [0x%08x] => 0x%08x\n", offset, value);
 355         return value;
 356     } else if (offset <= PL041_dr4_7) {
 357         value = *((uint32_t *)&s->regs + (offset >> 2));
 358     } else {
 359         DBG_L1("pl041_read: Reserved offset %x\n", (int)offset);
 360         return 0;
 361     }
 362
 363     switch (offset) {
 364     case PL041_allints:
 365         value = s->regs.isr1 & 0x7F;
 366         break;
 367     }
 368
 369     DBG_L1("pl041_read [0x%08x] %s => 0x%08x\n", offset,
 370            get_reg_name(offset), value);
 371
 372     return value;
 373 }
 374
 375 static void pl041_write(void *opaque, hwaddr offset,
 376                              uint64_t value, unsigned size)
 377 {
 378     PL041State *s = (PL041State *)opaque;
 379     uint16_t control, data;
 380     uint32_t result;
 381
 382     DBG_L1("pl041_write [0x%08x] %s <= 0x%08x\n", offset,
 383            get_reg_name(offset), (unsigned int)value);
 384
 385     /* Write the register */
 386     if (offset <= PL041_dr4_7) {
 387         *((uint32_t *)&s->regs + (offset >> 2)) = value;
 388     } else {
 389         DBG_L1("pl041_write: Reserved offset %x\n", (int)offset);
 390         return;
 391     }
 392
 393     /* Execute the actions */
 394     switch (offset) {
 395     case PL041_txcr1:
 396     {
 397         pl041_channel *channel = &s->fifo1;
 398
 399         uint32_t txen = s->regs.txcr1 & TXEN;
 400         uint32_t tsize = (s->regs.txcr1 & TSIZE_MASK) >> TSIZE_MASK_BIT;
 401         uint32_t compact_mode = (s->regs.txcr1 & TXCOMPACT) ? 1 : 0;
 402 #if defined(PL041_DEBUG_LEVEL)
 403         uint32_t slots = (s->regs.txcr1 & TXSLOT_MASK) >> TXSLOT_MASK_BIT;
 404         uint32_t txfen = (s->regs.txcr1 & TXFEN) > 0 ? 1 : 0;
 405 #endif
 406
 407         DBG_L1("=> txen = %i slots = 0x%01x tsize = %i compact = %i "
 408                "txfen = %i\n", txen, slots,  tsize, compact_mode, txfen);
 409
 410         channel->tx_enabled = txen;
 411         channel->tx_compact_mode = compact_mode;
 412
 413         switch (tsize) {
 414         case 0:
 415             channel->tx_sample_size = 16;
 416             break;
 417         case 1:
 418             channel->tx_sample_size = 18;
 419             break;
 420         case 2:
 421             channel->tx_sample_size = 20;
 422             break;
 423         case 3:
 424             channel->tx_sample_size = 12;
 425             break;
 426         }
 427
 428         DBG_L1("TX enabled = %i\n", channel->tx_enabled);
 429         DBG_L1("TX compact mode = %i\n", channel->tx_compact_mode);
 430         DBG_L1("TX sample width = %i\n", channel->tx_sample_size);
 431
 432         /* Check if compact mode is allowed with selected tsize */
 433         if (channel->tx_compact_mode == 1) {
 434             if ((channel->tx_sample_size == 18) ||
 435                 (channel->tx_sample_size == 20)) {
 436                 channel->tx_compact_mode = 0;
 437                 DBG_L1("Compact mode not allowed with 18/20-bit sample size\n");
 438             }
 439         }
 440
 441         break;
 442     }
 443     case PL041_sl1tx:
 444         s->regs.slfr &= ~SL1TXEMPTY;
 445
 446         control = (s->regs.sl1tx >> 12) & 0x7F;
 447         data = (s->regs.sl2tx >> 4) & 0xFFFF;
 448
 449         if ((s->regs.sl1tx & SLOT1_RW) == 0) {
 450             /* Write operation */
 451             lm4549_write(&s->codec, control, data);
 452         } else {
 453             /* Read operation */
 454             result = lm4549_read(&s->codec, control);
 455
 456             /* Store the returned value */
 457             s->regs.sl1rx = s->regs.sl1tx & ~SLOT1_RW;
 458             s->regs.sl2rx = result << 4;
 459
 460             s->regs.slfr &= ~(SL1RXBUSY | SL2RXBUSY);
 461             s->regs.slfr |= SL1RXVALID | SL2RXVALID;
 462         }
 463         break;
 464
 465     case PL041_sl2tx:
 466         s->regs.sl2tx = value;
 467         s->regs.slfr &= ~SL2TXEMPTY;
 468         break;
 469
 470     case PL041_intclr:
 471         DBG_L1("=> Clear interrupt intclr = 0x%08x isr1 = 0x%08x\n",
 472                s->regs.intclr, s->regs.isr1);
 473
 474         if (s->regs.intclr & TXUEC1) {
 475             s->regs.sr1 &= ~TXUNDERRUN;
 476         }
 477         break;
 478
 479     case PL041_maincr:
 480     {
 481 #if defined(PL041_DEBUG_LEVEL)
 482         char debug[] = " AACIFE  SL1RXEN  SL1TXEN";
 483         if (!(value & AACIFE)) {
 484             debug[0] = '!';
 485         }
 486         if (!(value & SL1RXEN)) {
 487             debug[8] = '!';
 488         }
 489         if (!(value & SL1TXEN)) {
 490             debug[17] = '!';
 491         }
 492         DBG_L1("%s\n", debug);
 493 #endif
 494
 495         if ((s->regs.maincr & AACIFE) == 0) {
 496             pl041_reset(s);
 497         }
 498         break;
 499     }
 500
 501     case PL041_dr1_0:
 502     case PL041_dr1_1:
 503     case PL041_dr1_2:
 504     case PL041_dr1_3:
 505         pl041_fifo1_write(s, value);
 506         break;
 507     }
 508
 509     /* Transmit the FIFO content */
 510     pl041_fifo1_transmit(s);
 511
 512     /* Update the ISR1 register */
 513     pl041_isr1_update(s);
 514 }
 515
 516 static void pl041_device_reset(DeviceState *d)
 517 {
 518     PL041State *s = PL041(d);
 519
 520     pl041_reset(s);
 521 }
 522
 523 static const MemoryRegionOps pl041_ops = {
 524     .read = pl041_read,
 525     .write = pl041_write,
 526     .endianness = DEVICE_NATIVE_ENDIAN,
 527 };
 528
 529 static void pl041_init(Object *obj)
 530 {
 531     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 532     PL041State *s = PL041(dev);
 533
 534     DBG_L1("pl041_init 0x%08x\n", (uint32_t)s);
 535
 536     /* Connect the device to the sysbus */
 537     memory_region_init_io(&s->iomem, obj, &pl041_ops, s, "pl041", 0x1000);
 538     sysbus_init_mmio(dev, &s->iomem);
 539     sysbus_init_irq(dev, &s->irq);
 540 }
 541
 542 static void pl041_realize(DeviceState *dev, Error **errp)
 543 {
 544     PL041State *s = PL041(dev);
 545
 546     /* Check the device properties */
 547     switch (s->fifo_depth) {
 548     case 8:
 549     case 32:
 550     case 64:
 551     case 128:
 552     case 256:
 553     case 512:
 554     case 1024:
 555     case 2048:
 556         break;
 557     case 16:
 558     default:
 559         /* NC FIFO depth of 16 is not allowed because its id bits in
 560            AACIPERIPHID3 overlap with the id for the default NC FIFO depth */
 561         qemu_log_mask(LOG_UNIMP,
 562                       "pl041: unsupported non-compact fifo depth [%i]\n",
 563                       s->fifo_depth);
 564     }
 565
 566     /* Init the codec */
 567     lm4549_init(&s->codec, &pl041_request_data, (void *)s, errp);
 568 }
 569
 570 static const VMStateDescription vmstate_pl041_regfile = {
 571     .name = "pl041_regfile",
 572     .version_id = 1,
 573     .minimum_version_id = 1,
 574     .fields = (VMStateField[]) {
 575 #define REGISTER(name, offset) VMSTATE_UINT32(name, pl041_regfile),
 576         #include "pl041.hx"
 577 #undef REGISTER
 578         VMSTATE_END_OF_LIST()
 579     }
 580 };
 581
 582 static const VMStateDescription vmstate_pl041_fifo = {
 583     .name = "pl041_fifo",
 584     .version_id = 1,
 585     .minimum_version_id = 1,
 586     .fields = (VMStateField[]) {
 587         VMSTATE_UINT32(level, pl041_fifo),
 588         VMSTATE_UINT32_ARRAY(data, pl041_fifo, MAX_FIFO_DEPTH),
 589         VMSTATE_END_OF_LIST()
 590     }
 591 };
 592
 593 static const VMStateDescription vmstate_pl041_channel = {
 594     .name = "pl041_channel",
 595     .version_id = 1,
 596     .minimum_version_id = 1,
 597     .fields = (VMStateField[]) {
 598         VMSTATE_STRUCT(tx_fifo, pl041_channel, 0,
 599                        vmstate_pl041_fifo, pl041_fifo),
 600         VMSTATE_UINT8(tx_enabled, pl041_channel),
 601         VMSTATE_UINT8(tx_compact_mode, pl041_channel),
 602         VMSTATE_UINT8(tx_sample_size, pl041_channel),
 603         VMSTATE_STRUCT(rx_fifo, pl041_channel, 0,
 604                        vmstate_pl041_fifo, pl041_fifo),
 605         VMSTATE_UINT8(rx_enabled, pl041_channel),
 606         VMSTATE_UINT8(rx_compact_mode, pl041_channel),
 607         VMSTATE_UINT8(rx_sample_size, pl041_channel),
 608         VMSTATE_END_OF_LIST()
 609     }
 610 };
 611
 612 static const VMStateDescription vmstate_pl041 = {
 613     .name = "pl041",
 614     .version_id = 1,
 615     .minimum_version_id = 1,
 616     .fields = (VMStateField[]) {
 617         VMSTATE_UINT32(fifo_depth, PL041State),
 618         VMSTATE_STRUCT(regs, PL041State, 0,
 619                        vmstate_pl041_regfile, pl041_regfile),
 620         VMSTATE_STRUCT(fifo1, PL041State, 0,
 621                        vmstate_pl041_channel, pl041_channel),
 622         VMSTATE_STRUCT(codec, PL041State, 0,
 623                        vmstate_lm4549_state, lm4549_state),
 624         VMSTATE_END_OF_LIST()
 625     }
 626 };
 627
 628 static Property pl041_device_properties[] = {
 629     DEFINE_AUDIO_PROPERTIES(PL041State, codec.card),
 630     /* Non-compact FIFO depth property */
 631     DEFINE_PROP_UINT32("nc_fifo_depth", PL041State, fifo_depth,
 632                        DEFAULT_FIFO_DEPTH),
 633     DEFINE_PROP_END_OF_LIST(),
 634 };
 635
 636 static void pl041_device_class_init(ObjectClass *klass, void *data)
 637 {
 638     DeviceClass *dc = DEVICE_CLASS(klass);
 639
 640     dc->realize = pl041_realize;
 641     set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
 642     dc->reset = pl041_device_reset;
 643     dc->vmsd = &vmstate_pl041;
 644     device_class_set_props(dc, pl041_device_properties);
 645 }
 646
 647 static const TypeInfo pl041_device_info = {
 648     .name          = TYPE_PL041,
 649     .parent        = TYPE_SYS_BUS_DEVICE,
 650     .instance_size = sizeof(PL041State),
 651     .instance_init = pl041_init,
 652     .class_init    = pl041_device_class_init,
 653 };
 654
 655 static void pl041_register_types(void)
 656 {
 657     type_register_static(&pl041_device_info);
 658 }
 659
 660 type_init(pl041_register_types)