hw/dma/pxa2xx_dma.c

   1 /*
   2  * Intel XScale PXA255/270 DMA controller.
   3  *
   4  * Copyright (c) 2006 Openedhand Ltd.
   5  * Copyright (c) 2006 Thorsten Zitterell
   6  * Written by Andrzej Zaborowski <balrog@zabor.org>
   7  *
   8  * This code is licensed under the GPL.
   9  */
  10
  11 #include "hw/hw.h"
  12 #include "hw/arm/pxa.h"
  13 #include "hw/sysbus.h"
  14
  15 #define PXA255_DMA_NUM_CHANNELS 16
  16 #define PXA27X_DMA_NUM_CHANNELS 32
  17
  18 #define PXA2XX_DMA_NUM_REQUESTS 75
  19
  20 typedef struct {
  21     uint32_t descr;
  22     uint32_t src;
  23     uint32_t dest;
  24     uint32_t cmd;
  25     uint32_t state;
  26     int request;
  27 } PXA2xxDMAChannel;
  28
  29 #define TYPE_PXA2XX_DMA "pxa2xx-dma"
  30 #define PXA2XX_DMA(obj) OBJECT_CHECK(PXA2xxDMAState, (obj), TYPE_PXA2XX_DMA)
  31
  32 typedef struct PXA2xxDMAState {
  33     SysBusDevice parent_obj;
  34
  35     MemoryRegion iomem;
  36     qemu_irq irq;
  37
  38     uint32_t stopintr;
  39     uint32_t eorintr;
  40     uint32_t rasintr;
  41     uint32_t startintr;
  42     uint32_t endintr;
  43
  44     uint32_t align;
  45     uint32_t pio;
  46
  47     int channels;
  48     PXA2xxDMAChannel *chan;
  49
  50     uint8_t req[PXA2XX_DMA_NUM_REQUESTS];
  51
  52     /* Flag to avoid recursive DMA invocations.  */
  53     int running;
  54 } PXA2xxDMAState;
  55
  56 #define DCSR0   0x0000  /* DMA Control / Status register for Channel 0 */
  57 #define DCSR31  0x007c  /* DMA Control / Status register for Channel 31 */
  58 #define DALGN   0x00a0  /* DMA Alignment register */
  59 #define DPCSR   0x00a4  /* DMA Programmed I/O Control Status register */
  60 #define DRQSR0  0x00e0  /* DMA DREQ<0> Status register */
  61 #define DRQSR1  0x00e4  /* DMA DREQ<1> Status register */
  62 #define DRQSR2  0x00e8  /* DMA DREQ<2> Status register */
  63 #define DINT    0x00f0  /* DMA Interrupt register */
  64 #define DRCMR0  0x0100  /* Request to Channel Map register 0 */
  65 #define DRCMR63 0x01fc  /* Request to Channel Map register 63 */
  66 #define D_CH0   0x0200  /* Channel 0 Descriptor start */
  67 #define DRCMR64 0x1100  /* Request to Channel Map register 64 */
  68 #define DRCMR74 0x1128  /* Request to Channel Map register 74 */
  69
  70 /* Per-channel register */
  71 #define DDADR   0x00
  72 #define DSADR   0x01
  73 #define DTADR   0x02
  74 #define DCMD    0x03
  75
  76 /* Bit-field masks */
  77 #define DRCMR_CHLNUM            0x1f
  78 #define DRCMR_MAPVLD            (1 << 7)
  79 #define DDADR_STOP              (1 << 0)
  80 #define DDADR_BREN              (1 << 1)
  81 #define DCMD_LEN                0x1fff
  82 #define DCMD_WIDTH(x)           (1 << ((((x) >> 14) & 3) - 1))
  83 #define DCMD_SIZE(x)            (4 << (((x) >> 16) & 3))
  84 #define DCMD_FLYBYT             (1 << 19)
  85 #define DCMD_FLYBYS             (1 << 20)
  86 #define DCMD_ENDIRQEN           (1 << 21)
  87 #define DCMD_STARTIRQEN         (1 << 22)
  88 #define DCMD_CMPEN              (1 << 25)
  89 #define DCMD_FLOWTRG            (1 << 28)
  90 #define DCMD_FLOWSRC            (1 << 29)
  91 #define DCMD_INCTRGADDR         (1 << 30)
  92 #define DCMD_INCSRCADDR         (1 << 31)
  93 #define DCSR_BUSERRINTR         (1 << 0)
  94 #define DCSR_STARTINTR          (1 << 1)
  95 #define DCSR_ENDINTR            (1 << 2)
  96 #define DCSR_STOPINTR           (1 << 3)
  97 #define DCSR_RASINTR            (1 << 4)
  98 #define DCSR_REQPEND            (1 << 8)
  99 #define DCSR_EORINT             (1 << 9)
 100 #define DCSR_CMPST              (1 << 10)
 101 #define DCSR_MASKRUN            (1 << 22)
 102 #define DCSR_RASIRQEN           (1 << 23)
 103 #define DCSR_CLRCMPST           (1 << 24)
 104 #define DCSR_SETCMPST           (1 << 25)
 105 #define DCSR_EORSTOPEN          (1 << 26)
 106 #define DCSR_EORJMPEN           (1 << 27)
 107 #define DCSR_EORIRQEN           (1 << 28)
 108 #define DCSR_STOPIRQEN          (1 << 29)
 109 #define DCSR_NODESCFETCH        (1 << 30)
 110 #define DCSR_RUN                (1 << 31)
 111
 112 static inline void pxa2xx_dma_update(PXA2xxDMAState *s, int ch)
 113 {
 114     if (ch >= 0) {
 115         if ((s->chan[ch].state & DCSR_STOPIRQEN) &&
 116                 (s->chan[ch].state & DCSR_STOPINTR))
 117             s->stopintr |= 1 << ch;
 118         else
 119             s->stopintr &= ~(1 << ch);
 120
 121         if ((s->chan[ch].state & DCSR_EORIRQEN) &&
 122                 (s->chan[ch].state & DCSR_EORINT))
 123             s->eorintr |= 1 << ch;
 124         else
 125             s->eorintr &= ~(1 << ch);
 126
 127         if ((s->chan[ch].state & DCSR_RASIRQEN) &&
 128                 (s->chan[ch].state & DCSR_RASINTR))
 129             s->rasintr |= 1 << ch;
 130         else
 131             s->rasintr &= ~(1 << ch);
 132
 133         if (s->chan[ch].state & DCSR_STARTINTR)
 134             s->startintr |= 1 << ch;
 135         else
 136             s->startintr &= ~(1 << ch);
 137
 138         if (s->chan[ch].state & DCSR_ENDINTR)
 139             s->endintr |= 1 << ch;
 140         else
 141             s->endintr &= ~(1 << ch);
 142     }
 143
 144     if (s->stopintr | s->eorintr | s->rasintr | s->startintr | s->endintr)
 145         qemu_irq_raise(s->irq);
 146     else
 147         qemu_irq_lower(s->irq);
 148 }
 149
 150 static inline void pxa2xx_dma_descriptor_fetch(
 151                 PXA2xxDMAState *s, int ch)
 152 {
 153     uint32_t desc[4];
 154     hwaddr daddr = s->chan[ch].descr & ~0xf;
 155     if ((s->chan[ch].descr & DDADR_BREN) && (s->chan[ch].state & DCSR_CMPST))
 156         daddr += 32;
 157
 158     cpu_physical_memory_read(daddr, desc, 16);
 159     s->chan[ch].descr = desc[DDADR];
 160     s->chan[ch].src = desc[DSADR];
 161     s->chan[ch].dest = desc[DTADR];
 162     s->chan[ch].cmd = desc[DCMD];
 163
 164     if (s->chan[ch].cmd & DCMD_FLOWSRC)
 165         s->chan[ch].src &= ~3;
 166     if (s->chan[ch].cmd & DCMD_FLOWTRG)
 167         s->chan[ch].dest &= ~3;
 168
 169     if (s->chan[ch].cmd & (DCMD_CMPEN | DCMD_FLYBYS | DCMD_FLYBYT))
 170         printf("%s: unsupported mode in channel %i\n", __FUNCTION__, ch);
 171
 172     if (s->chan[ch].cmd & DCMD_STARTIRQEN)
 173         s->chan[ch].state |= DCSR_STARTINTR;
 174 }
 175
 176 static void pxa2xx_dma_run(PXA2xxDMAState *s)
 177 {
 178     int c, srcinc, destinc;
 179     uint32_t n, size;
 180     uint32_t width;
 181     uint32_t length;
 182     uint8_t buffer[32];
 183     PXA2xxDMAChannel *ch;
 184
 185     if (s->running ++)
 186         return;
 187
 188     while (s->running) {
 189         s->running = 1;
 190         for (c = 0; c < s->channels; c ++) {
 191             ch = &s->chan[c];
 192
 193             while ((ch->state & DCSR_RUN) && !(ch->state & DCSR_STOPINTR)) {
 194                 /* Test for pending requests */
 195                 if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) && !ch->request)
 196                     break;
 197
 198                 length = ch->cmd & DCMD_LEN;
 199                 size = DCMD_SIZE(ch->cmd);
 200                 width = DCMD_WIDTH(ch->cmd);
 201
 202                 srcinc = (ch->cmd & DCMD_INCSRCADDR) ? width : 0;
 203                 destinc = (ch->cmd & DCMD_INCTRGADDR) ? width : 0;
 204
 205                 while (length) {
 206                     size = MIN(length, size);
 207
 208                     for (n = 0; n < size; n += width) {
 209                         cpu_physical_memory_read(ch->src, buffer + n, width);
 210                         ch->src += srcinc;
 211                     }
 212
 213                     for (n = 0; n < size; n += width) {
 214                         cpu_physical_memory_write(ch->dest, buffer + n, width);
 215                         ch->dest += destinc;
 216                     }
 217
 218                     length -= size;
 219
 220                     if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) &&
 221                             !ch->request) {
 222                         ch->state |= DCSR_EORINT;
 223                         if (ch->state & DCSR_EORSTOPEN)
 224                             ch->state |= DCSR_STOPINTR;
 225                         if ((ch->state & DCSR_EORJMPEN) &&
 226                                         !(ch->state & DCSR_NODESCFETCH))
 227                             pxa2xx_dma_descriptor_fetch(s, c);
 228                         break;
 229                     }
 230                 }
 231
 232                 ch->cmd = (ch->cmd & ~DCMD_LEN) | length;
 233
 234                 /* Is the transfer complete now? */
 235                 if (!length) {
 236                     if (ch->cmd & DCMD_ENDIRQEN)
 237                         ch->state |= DCSR_ENDINTR;
 238
 239                     if ((ch->state & DCSR_NODESCFETCH) ||
 240                                 (ch->descr & DDADR_STOP) ||
 241                                 (ch->state & DCSR_EORSTOPEN)) {
 242                         ch->state |= DCSR_STOPINTR;
 243                         ch->state &= ~DCSR_RUN;
 244
 245                         break;
 246                     }
 247
 248                     ch->state |= DCSR_STOPINTR;
 249                     break;
 250                 }
 251             }
 252         }
 253
 254         s->running --;
 255     }
 256 }
 257
 258 static uint64_t pxa2xx_dma_read(void *opaque, hwaddr offset,
 259                                 unsigned size)
 260 {
 261     PXA2xxDMAState *s = (PXA2xxDMAState *) opaque;
 262     unsigned int channel;
 263
 264     if (size != 4) {
 265         hw_error("%s: Bad access width\n", __FUNCTION__);
 266         return 5;
 267     }
 268
 269     switch (offset) {
 270     case DRCMR64 ... DRCMR74:
 271         offset -= DRCMR64 - DRCMR0 - (64 << 2);
 272         /* Fall through */
 273     case DRCMR0 ... DRCMR63:
 274         channel = (offset - DRCMR0) >> 2;
 275         return s->req[channel];
 276
 277     case DRQSR0:
 278     case DRQSR1:
 279     case DRQSR2:
 280         return 0;
 281
 282     case DCSR0 ... DCSR31:
 283         channel = offset >> 2;
 284         if (s->chan[channel].request)
 285             return s->chan[channel].state | DCSR_REQPEND;
 286         return s->chan[channel].state;
 287
 288     case DINT:
 289         return s->stopintr | s->eorintr | s->rasintr |
 290                 s->startintr | s->endintr;
 291
 292     case DALGN:
 293         return s->align;
 294
 295     case DPCSR:
 296         return s->pio;
 297     }
 298
 299     if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) {
 300         channel = (offset - D_CH0) >> 4;
 301         switch ((offset & 0x0f) >> 2) {
 302         case DDADR:
 303             return s->chan[channel].descr;
 304         case DSADR:
 305             return s->chan[channel].src;
 306         case DTADR:
 307             return s->chan[channel].dest;
 308         case DCMD:
 309             return s->chan[channel].cmd;
 310         }
 311     }
 312
 313     hw_error("%s: Bad offset 0x" TARGET_FMT_plx "\n", __FUNCTION__, offset);
 314     return 7;
 315 }
 316
 317 static void pxa2xx_dma_write(void *opaque, hwaddr offset,
 318                              uint64_t value, unsigned size)
 319 {
 320     PXA2xxDMAState *s = (PXA2xxDMAState *) opaque;
 321     unsigned int channel;
 322
 323     if (size != 4) {
 324         hw_error("%s: Bad access width\n", __FUNCTION__);
 325         return;
 326     }
 327
 328     switch (offset) {
 329     case DRCMR64 ... DRCMR74:
 330         offset -= DRCMR64 - DRCMR0 - (64 << 2);
 331         /* Fall through */
 332     case DRCMR0 ... DRCMR63:
 333         channel = (offset - DRCMR0) >> 2;
 334
 335         if (value & DRCMR_MAPVLD)
 336             if ((value & DRCMR_CHLNUM) > s->channels)
 337                 hw_error("%s: Bad DMA channel %i\n",
 338                          __FUNCTION__, (unsigned)value & DRCMR_CHLNUM);
 339
 340         s->req[channel] = value;
 341         break;
 342
 343     case DRQSR0:
 344     case DRQSR1:
 345     case DRQSR2:
 346         /* Nothing to do */
 347         break;
 348
 349     case DCSR0 ... DCSR31:
 350         channel = offset >> 2;
 351         s->chan[channel].state &= 0x0000071f & ~(value &
 352                         (DCSR_EORINT | DCSR_ENDINTR |
 353                          DCSR_STARTINTR | DCSR_BUSERRINTR));
 354         s->chan[channel].state |= value & 0xfc800000;
 355
 356         if (s->chan[channel].state & DCSR_STOPIRQEN)
 357             s->chan[channel].state &= ~DCSR_STOPINTR;
 358
 359         if (value & DCSR_NODESCFETCH) {
 360             /* No-descriptor-fetch mode */
 361             if (value & DCSR_RUN) {
 362                 s->chan[channel].state &= ~DCSR_STOPINTR;
 363                 pxa2xx_dma_run(s);
 364             }
 365         } else {
 366             /* Descriptor-fetch mode */
 367             if (value & DCSR_RUN) {
 368                 s->chan[channel].state &= ~DCSR_STOPINTR;
 369                 pxa2xx_dma_descriptor_fetch(s, channel);
 370                 pxa2xx_dma_run(s);
 371             }
 372         }
 373
 374         /* Shouldn't matter as our DMA is synchronous.  */
 375         if (!(value & (DCSR_RUN | DCSR_MASKRUN)))
 376             s->chan[channel].state |= DCSR_STOPINTR;
 377
 378         if (value & DCSR_CLRCMPST)
 379             s->chan[channel].state &= ~DCSR_CMPST;
 380         if (value & DCSR_SETCMPST)
 381             s->chan[channel].state |= DCSR_CMPST;
 382
 383         pxa2xx_dma_update(s, channel);
 384         break;
 385
 386     case DALGN:
 387         s->align = value;
 388         break;
 389
 390     case DPCSR:
 391         s->pio = value & 0x80000001;
 392         break;
 393
 394     default:
 395         if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) {
 396             channel = (offset - D_CH0) >> 4;
 397             switch ((offset & 0x0f) >> 2) {
 398             case DDADR:
 399                 s->chan[channel].descr = value;
 400                 break;
 401             case DSADR:
 402                 s->chan[channel].src = value;
 403                 break;
 404             case DTADR:
 405                 s->chan[channel].dest = value;
 406                 break;
 407             case DCMD:
 408                 s->chan[channel].cmd = value;
 409                 break;
 410             default:
 411                 goto fail;
 412             }
 413
 414             break;
 415         }
 416     fail:
 417         hw_error("%s: Bad offset " TARGET_FMT_plx "\n", __FUNCTION__, offset);
 418     }
 419 }
 420
 421 static const MemoryRegionOps pxa2xx_dma_ops = {
 422     .read = pxa2xx_dma_read,
 423     .write = pxa2xx_dma_write,
 424     .endianness = DEVICE_NATIVE_ENDIAN,
 425 };
 426
 427 static void pxa2xx_dma_request(void *opaque, int req_num, int on)
 428 {
 429     PXA2xxDMAState *s = opaque;
 430     int ch;
 431     if (req_num < 0 || req_num >= PXA2XX_DMA_NUM_REQUESTS)
 432         hw_error("%s: Bad DMA request %i\n", __FUNCTION__, req_num);
 433
 434     if (!(s->req[req_num] & DRCMR_MAPVLD))
 435         return;
 436     ch = s->req[req_num] & DRCMR_CHLNUM;
 437
 438     if (!s->chan[ch].request && on)
 439         s->chan[ch].state |= DCSR_RASINTR;
 440     else
 441         s->chan[ch].state &= ~DCSR_RASINTR;
 442     if (s->chan[ch].request && !on)
 443         s->chan[ch].state |= DCSR_EORINT;
 444
 445     s->chan[ch].request = on;
 446     if (on) {
 447         pxa2xx_dma_run(s);
 448         pxa2xx_dma_update(s, ch);
 449     }
 450 }
 451
 452 static int pxa2xx_dma_init(SysBusDevice *sbd)
 453 {
 454     DeviceState *dev = DEVICE(sbd);
 455     PXA2xxDMAState *s = PXA2XX_DMA(dev);
 456     int i;
 457
 458     if (s->channels <= 0) {
 459         return -1;
 460     }
 461
 462     s->chan = g_new0(PXA2xxDMAChannel, s->channels);
 463
 464     for (i = 0; i < s->channels; i ++)
 465         s->chan[i].state = DCSR_STOPINTR;
 466
 467     memset(s->req, 0, sizeof(uint8_t) * PXA2XX_DMA_NUM_REQUESTS);
 468
 469     qdev_init_gpio_in(dev, pxa2xx_dma_request, PXA2XX_DMA_NUM_REQUESTS);
 470
 471     memory_region_init_io(&s->iomem, OBJECT(s), &pxa2xx_dma_ops, s,
 472                           "pxa2xx.dma", 0x00010000);
 473     sysbus_init_mmio(sbd, &s->iomem);
 474     sysbus_init_irq(sbd, &s->irq);
 475
 476     return 0;
 477 }
 478
 479 DeviceState *pxa27x_dma_init(hwaddr base, qemu_irq irq)
 480 {
 481     DeviceState *dev;
 482
 483     dev = qdev_create(NULL, "pxa2xx-dma");
 484     qdev_prop_set_int32(dev, "channels", PXA27X_DMA_NUM_CHANNELS);
 485     qdev_init_nofail(dev);
 486
 487     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
 488     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, irq);
 489
 490     return dev;
 491 }
 492
 493 DeviceState *pxa255_dma_init(hwaddr base, qemu_irq irq)
 494 {
 495     DeviceState *dev;
 496
 497     dev = qdev_create(NULL, "pxa2xx-dma");
 498     qdev_prop_set_int32(dev, "channels", PXA27X_DMA_NUM_CHANNELS);
 499     qdev_init_nofail(dev);
 500
 501     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
 502     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, irq);
 503
 504     return dev;
 505 }
 506
 507 static bool is_version_0(void *opaque, int version_id)
 508 {
 509     return version_id == 0;
 510 }
 511
 512 static VMStateDescription vmstate_pxa2xx_dma_chan = {
 513     .name = "pxa2xx_dma_chan",
 514     .version_id = 1,
 515     .minimum_version_id = 1,
 516     .fields = (VMStateField[]) {
 517         VMSTATE_UINT32(descr, PXA2xxDMAChannel),
 518         VMSTATE_UINT32(src, PXA2xxDMAChannel),
 519         VMSTATE_UINT32(dest, PXA2xxDMAChannel),
 520         VMSTATE_UINT32(cmd, PXA2xxDMAChannel),
 521         VMSTATE_UINT32(state, PXA2xxDMAChannel),
 522         VMSTATE_INT32(request, PXA2xxDMAChannel),
 523         VMSTATE_END_OF_LIST(),
 524     },
 525 };
 526
 527 static VMStateDescription vmstate_pxa2xx_dma = {
 528     .name = "pxa2xx_dma",
 529     .version_id = 1,
 530     .minimum_version_id = 0,
 531     .fields = (VMStateField[]) {
 532         VMSTATE_UNUSED_TEST(is_version_0, 4),
 533         VMSTATE_UINT32(stopintr, PXA2xxDMAState),
 534         VMSTATE_UINT32(eorintr, PXA2xxDMAState),
 535         VMSTATE_UINT32(rasintr, PXA2xxDMAState),
 536         VMSTATE_UINT32(startintr, PXA2xxDMAState),
 537         VMSTATE_UINT32(endintr, PXA2xxDMAState),
 538         VMSTATE_UINT32(align, PXA2xxDMAState),
 539         VMSTATE_UINT32(pio, PXA2xxDMAState),
 540         VMSTATE_BUFFER(req, PXA2xxDMAState),
 541         VMSTATE_STRUCT_VARRAY_POINTER_INT32(chan, PXA2xxDMAState, channels,
 542                 vmstate_pxa2xx_dma_chan, PXA2xxDMAChannel),
 543         VMSTATE_END_OF_LIST(),
 544     },
 545 };
 546
 547 static Property pxa2xx_dma_properties[] = {
 548     DEFINE_PROP_INT32("channels", PXA2xxDMAState, channels, -1),
 549     DEFINE_PROP_END_OF_LIST(),
 550 };
 551
 552 static void pxa2xx_dma_class_init(ObjectClass *klass, void *data)
 553 {
 554     DeviceClass *dc = DEVICE_CLASS(klass);
 555     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 556
 557     k->init = pxa2xx_dma_init;
 558     dc->desc = "PXA2xx DMA controller";
 559     dc->vmsd = &vmstate_pxa2xx_dma;
 560     dc->props = pxa2xx_dma_properties;
 561 }
 562
 563 static const TypeInfo pxa2xx_dma_info = {
 564     .name          = TYPE_PXA2XX_DMA,
 565     .parent        = TYPE_SYS_BUS_DEVICE,
 566     .instance_size = sizeof(PXA2xxDMAState),
 567     .class_init    = pxa2xx_dma_class_init,
 568 };
 569
 570 static void pxa2xx_dma_register_types(void)
 571 {
 572     type_register_static(&pxa2xx_dma_info);
 573 }
 574
 575 type_init(pxa2xx_dma_register_types)