hw/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/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 typedef struct PXA2xxDMAState {
  30     SysBusDevice busdev;
  31     MemoryRegion iomem;
  32     qemu_irq irq;
  33
  34     uint32_t stopintr;
  35     uint32_t eorintr;
  36     uint32_t rasintr;
  37     uint32_t startintr;
  38     uint32_t endintr;
  39
  40     uint32_t align;
  41     uint32_t pio;
  42
  43     int channels;
  44     PXA2xxDMAChannel *chan;
  45
  46     uint8_t req[PXA2XX_DMA_NUM_REQUESTS];
  47
  48     /* Flag to avoid recursive DMA invocations.  */
  49     int running;
  50 } PXA2xxDMAState;
  51
  52 #define DCSR0   0x0000  /* DMA Control / Status register for Channel 0 */
  53 #define DCSR31  0x007c  /* DMA Control / Status register for Channel 31 */
  54 #define DALGN   0x00a0  /* DMA Alignment register */
  55 #define DPCSR   0x00a4  /* DMA Programmed I/O Control Status register */
  56 #define DRQSR0  0x00e0  /* DMA DREQ<0> Status register */
  57 #define DRQSR1  0x00e4  /* DMA DREQ<1> Status register */
  58 #define DRQSR2  0x00e8  /* DMA DREQ<2> Status register */
  59 #define DINT    0x00f0  /* DMA Interrupt register */
  60 #define DRCMR0  0x0100  /* Request to Channel Map register 0 */
  61 #define DRCMR63 0x01fc  /* Request to Channel Map register 63 */
  62 #define D_CH0   0x0200  /* Channel 0 Descriptor start */
  63 #define DRCMR64 0x1100  /* Request to Channel Map register 64 */
  64 #define DRCMR74 0x1128  /* Request to Channel Map register 74 */
  65
  66 /* Per-channel register */
  67 #define DDADR   0x00
  68 #define DSADR   0x01
  69 #define DTADR   0x02
  70 #define DCMD    0x03
  71
  72 /* Bit-field masks */
  73 #define DRCMR_CHLNUM            0x1f
  74 #define DRCMR_MAPVLD            (1 << 7)
  75 #define DDADR_STOP              (1 << 0)
  76 #define DDADR_BREN              (1 << 1)
  77 #define DCMD_LEN                0x1fff
  78 #define DCMD_WIDTH(x)           (1 << ((((x) >> 14) & 3) - 1))
  79 #define DCMD_SIZE(x)            (4 << (((x) >> 16) & 3))
  80 #define DCMD_FLYBYT             (1 << 19)
  81 #define DCMD_FLYBYS             (1 << 20)
  82 #define DCMD_ENDIRQEN           (1 << 21)
  83 #define DCMD_STARTIRQEN         (1 << 22)
  84 #define DCMD_CMPEN              (1 << 25)
  85 #define DCMD_FLOWTRG            (1 << 28)
  86 #define DCMD_FLOWSRC            (1 << 29)
  87 #define DCMD_INCTRGADDR         (1 << 30)
  88 #define DCMD_INCSRCADDR         (1 << 31)
  89 #define DCSR_BUSERRINTR         (1 << 0)
  90 #define DCSR_STARTINTR          (1 << 1)
  91 #define DCSR_ENDINTR            (1 << 2)
  92 #define DCSR_STOPINTR           (1 << 3)
  93 #define DCSR_RASINTR            (1 << 4)
  94 #define DCSR_REQPEND            (1 << 8)
  95 #define DCSR_EORINT             (1 << 9)
  96 #define DCSR_CMPST              (1 << 10)
  97 #define DCSR_MASKRUN            (1 << 22)
  98 #define DCSR_RASIRQEN           (1 << 23)
  99 #define DCSR_CLRCMPST           (1 << 24)
 100 #define DCSR_SETCMPST           (1 << 25)
 101 #define DCSR_EORSTOPEN          (1 << 26)
 102 #define DCSR_EORJMPEN           (1 << 27)
 103 #define DCSR_EORIRQEN           (1 << 28)
 104 #define DCSR_STOPIRQEN          (1 << 29)
 105 #define DCSR_NODESCFETCH        (1 << 30)
 106 #define DCSR_RUN                (1 << 31)
 107
 108 static inline void pxa2xx_dma_update(PXA2xxDMAState *s, int ch)
 109 {
 110     if (ch >= 0) {
 111         if ((s->chan[ch].state & DCSR_STOPIRQEN) &&
 112                 (s->chan[ch].state & DCSR_STOPINTR))
 113             s->stopintr |= 1 << ch;
 114         else
 115             s->stopintr &= ~(1 << ch);
 116
 117         if ((s->chan[ch].state & DCSR_EORIRQEN) &&
 118                 (s->chan[ch].state & DCSR_EORINT))
 119             s->eorintr |= 1 << ch;
 120         else
 121             s->eorintr &= ~(1 << ch);
 122
 123         if ((s->chan[ch].state & DCSR_RASIRQEN) &&
 124                 (s->chan[ch].state & DCSR_RASINTR))
 125             s->rasintr |= 1 << ch;
 126         else
 127             s->rasintr &= ~(1 << ch);
 128
 129         if (s->chan[ch].state & DCSR_STARTINTR)
 130             s->startintr |= 1 << ch;
 131         else
 132             s->startintr &= ~(1 << ch);
 133
 134         if (s->chan[ch].state & DCSR_ENDINTR)
 135             s->endintr |= 1 << ch;
 136         else
 137             s->endintr &= ~(1 << ch);
 138     }
 139
 140     if (s->stopintr | s->eorintr | s->rasintr | s->startintr | s->endintr)
 141         qemu_irq_raise(s->irq);
 142     else
 143         qemu_irq_lower(s->irq);
 144 }
 145
 146 static inline void pxa2xx_dma_descriptor_fetch(
 147                 PXA2xxDMAState *s, int ch)
 148 {
 149     uint32_t desc[4];
 150     hwaddr daddr = s->chan[ch].descr & ~0xf;
 151     if ((s->chan[ch].descr & DDADR_BREN) && (s->chan[ch].state & DCSR_CMPST))
 152         daddr += 32;
 153
 154     cpu_physical_memory_read(daddr, (uint8_t *) desc, 16);
 155     s->chan[ch].descr = desc[DDADR];
 156     s->chan[ch].src = desc[DSADR];
 157     s->chan[ch].dest = desc[DTADR];
 158     s->chan[ch].cmd = desc[DCMD];
 159
 160     if (s->chan[ch].cmd & DCMD_FLOWSRC)
 161         s->chan[ch].src &= ~3;
 162     if (s->chan[ch].cmd & DCMD_FLOWTRG)
 163         s->chan[ch].dest &= ~3;
 164
 165     if (s->chan[ch].cmd & (DCMD_CMPEN | DCMD_FLYBYS | DCMD_FLYBYT))
 166         printf("%s: unsupported mode in channel %i\n", __FUNCTION__, ch);
 167
 168     if (s->chan[ch].cmd & DCMD_STARTIRQEN)
 169         s->chan[ch].state |= DCSR_STARTINTR;
 170 }
 171
 172 static void pxa2xx_dma_run(PXA2xxDMAState *s)
 173 {
 174     int c, srcinc, destinc;
 175     uint32_t n, size;
 176     uint32_t width;
 177     uint32_t length;
 178     uint8_t buffer[32];
 179     PXA2xxDMAChannel *ch;
 180
 181     if (s->running ++)
 182         return;
 183
 184     while (s->running) {
 185         s->running = 1;
 186         for (c = 0; c < s->channels; c ++) {
 187             ch = &s->chan[c];
 188
 189             while ((ch->state & DCSR_RUN) && !(ch->state & DCSR_STOPINTR)) {
 190                 /* Test for pending requests */
 191                 if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) && !ch->request)
 192                     break;
 193
 194                 length = ch->cmd & DCMD_LEN;
 195                 size = DCMD_SIZE(ch->cmd);
 196                 width = DCMD_WIDTH(ch->cmd);
 197
 198                 srcinc = (ch->cmd & DCMD_INCSRCADDR) ? width : 0;
 199                 destinc = (ch->cmd & DCMD_INCTRGADDR) ? width : 0;
 200
 201                 while (length) {
 202                     size = MIN(length, size);
 203
 204                     for (n = 0; n < size; n += width) {
 205                         cpu_physical_memory_read(ch->src, buffer + n, width);
 206                         ch->src += srcinc;
 207                     }
 208
 209                     for (n = 0; n < size; n += width) {
 210                         cpu_physical_memory_write(ch->dest, buffer + n, width);
 211                         ch->dest += destinc;
 212                     }
 213
 214                     length -= size;
 215
 216                     if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) &&
 217                             !ch->request) {
 218                         ch->state |= DCSR_EORINT;
 219                         if (ch->state & DCSR_EORSTOPEN)
 220                             ch->state |= DCSR_STOPINTR;
 221                         if ((ch->state & DCSR_EORJMPEN) &&
 222                                         !(ch->state & DCSR_NODESCFETCH))
 223                             pxa2xx_dma_descriptor_fetch(s, c);
 224                         break;
 225                     }
 226                 }
 227
 228                 ch->cmd = (ch->cmd & ~DCMD_LEN) | length;
 229
 230                 /* Is the transfer complete now? */
 231                 if (!length) {
 232                     if (ch->cmd & DCMD_ENDIRQEN)
 233                         ch->state |= DCSR_ENDINTR;
 234
 235                     if ((ch->state & DCSR_NODESCFETCH) ||
 236                                 (ch->descr & DDADR_STOP) ||
 237                                 (ch->state & DCSR_EORSTOPEN)) {
 238                         ch->state |= DCSR_STOPINTR;
 239                         ch->state &= ~DCSR_RUN;
 240
 241                         break;
 242                     }
 243
 244                     ch->state |= DCSR_STOPINTR;
 245                     break;
 246                 }
 247             }
 248         }
 249
 250         s->running --;
 251     }
 252 }
 253
 254 static uint64_t pxa2xx_dma_read(void *opaque, hwaddr offset,
 255                                 unsigned size)
 256 {
 257     PXA2xxDMAState *s = (PXA2xxDMAState *) opaque;
 258     unsigned int channel;
 259
 260     if (size != 4) {
 261         hw_error("%s: Bad access width\n", __FUNCTION__);
 262         return 5;
 263     }
 264
 265     switch (offset) {
 266     case DRCMR64 ... DRCMR74:
 267         offset -= DRCMR64 - DRCMR0 - (64 << 2);
 268         /* Fall through */
 269     case DRCMR0 ... DRCMR63:
 270         channel = (offset - DRCMR0) >> 2;
 271         return s->req[channel];
 272
 273     case DRQSR0:
 274     case DRQSR1:
 275     case DRQSR2:
 276         return 0;
 277
 278     case DCSR0 ... DCSR31:
 279         channel = offset >> 2;
 280         if (s->chan[channel].request)
 281             return s->chan[channel].state | DCSR_REQPEND;
 282         return s->chan[channel].state;
 283
 284     case DINT:
 285         return s->stopintr | s->eorintr | s->rasintr |
 286                 s->startintr | s->endintr;
 287
 288     case DALGN:
 289         return s->align;
 290
 291     case DPCSR:
 292         return s->pio;
 293     }
 294
 295     if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) {
 296         channel = (offset - D_CH0) >> 4;
 297         switch ((offset & 0x0f) >> 2) {
 298         case DDADR:
 299             return s->chan[channel].descr;
 300         case DSADR:
 301             return s->chan[channel].src;
 302         case DTADR:
 303             return s->chan[channel].dest;
 304         case DCMD:
 305             return s->chan[channel].cmd;
 306         }
 307     }
 308
 309     hw_error("%s: Bad offset 0x" TARGET_FMT_plx "\n", __FUNCTION__, offset);
 310     return 7;
 311 }
 312
 313 static void pxa2xx_dma_write(void *opaque, hwaddr offset,
 314                              uint64_t value, unsigned size)
 315 {
 316     PXA2xxDMAState *s = (PXA2xxDMAState *) opaque;
 317     unsigned int channel;
 318
 319     if (size != 4) {
 320         hw_error("%s: Bad access width\n", __FUNCTION__);
 321         return;
 322     }
 323
 324     switch (offset) {
 325     case DRCMR64 ... DRCMR74:
 326         offset -= DRCMR64 - DRCMR0 - (64 << 2);
 327         /* Fall through */
 328     case DRCMR0 ... DRCMR63:
 329         channel = (offset - DRCMR0) >> 2;
 330
 331         if (value & DRCMR_MAPVLD)
 332             if ((value & DRCMR_CHLNUM) > s->channels)
 333                 hw_error("%s: Bad DMA channel %i\n",
 334                          __FUNCTION__, (unsigned)value & DRCMR_CHLNUM);
 335
 336         s->req[channel] = value;
 337         break;
 338
 339     case DRQSR0:
 340     case DRQSR1:
 341     case DRQSR2:
 342         /* Nothing to do */
 343         break;
 344
 345     case DCSR0 ... DCSR31:
 346         channel = offset >> 2;
 347         s->chan[channel].state &= 0x0000071f & ~(value &
 348                         (DCSR_EORINT | DCSR_ENDINTR |
 349                          DCSR_STARTINTR | DCSR_BUSERRINTR));
 350         s->chan[channel].state |= value & 0xfc800000;
 351
 352         if (s->chan[channel].state & DCSR_STOPIRQEN)
 353             s->chan[channel].state &= ~DCSR_STOPINTR;
 354
 355         if (value & DCSR_NODESCFETCH) {
 356             /* No-descriptor-fetch mode */
 357             if (value & DCSR_RUN) {
 358                 s->chan[channel].state &= ~DCSR_STOPINTR;
 359                 pxa2xx_dma_run(s);
 360             }
 361         } else {
 362             /* Descriptor-fetch mode */
 363             if (value & DCSR_RUN) {
 364                 s->chan[channel].state &= ~DCSR_STOPINTR;
 365                 pxa2xx_dma_descriptor_fetch(s, channel);
 366                 pxa2xx_dma_run(s);
 367             }
 368         }
 369
 370         /* Shouldn't matter as our DMA is synchronous.  */
 371         if (!(value & (DCSR_RUN | DCSR_MASKRUN)))
 372             s->chan[channel].state |= DCSR_STOPINTR;
 373
 374         if (value & DCSR_CLRCMPST)
 375             s->chan[channel].state &= ~DCSR_CMPST;
 376         if (value & DCSR_SETCMPST)
 377             s->chan[channel].state |= DCSR_CMPST;
 378
 379         pxa2xx_dma_update(s, channel);
 380         break;
 381
 382     case DALGN:
 383         s->align = value;
 384         break;
 385
 386     case DPCSR:
 387         s->pio = value & 0x80000001;
 388         break;
 389
 390     default:
 391         if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) {
 392             channel = (offset - D_CH0) >> 4;
 393             switch ((offset & 0x0f) >> 2) {
 394             case DDADR:
 395                 s->chan[channel].descr = value;
 396                 break;
 397             case DSADR:
 398                 s->chan[channel].src = value;
 399                 break;
 400             case DTADR:
 401                 s->chan[channel].dest = value;
 402                 break;
 403             case DCMD:
 404                 s->chan[channel].cmd = value;
 405                 break;
 406             default:
 407                 goto fail;
 408             }
 409
 410             break;
 411         }
 412     fail:
 413         hw_error("%s: Bad offset " TARGET_FMT_plx "\n", __FUNCTION__, offset);
 414     }
 415 }
 416
 417 static const MemoryRegionOps pxa2xx_dma_ops = {
 418     .read = pxa2xx_dma_read,
 419     .write = pxa2xx_dma_write,
 420     .endianness = DEVICE_NATIVE_ENDIAN,
 421 };
 422
 423 static void pxa2xx_dma_request(void *opaque, int req_num, int on)
 424 {
 425     PXA2xxDMAState *s = opaque;
 426     int ch;
 427     if (req_num < 0 || req_num >= PXA2XX_DMA_NUM_REQUESTS)
 428         hw_error("%s: Bad DMA request %i\n", __FUNCTION__, req_num);
 429
 430     if (!(s->req[req_num] & DRCMR_MAPVLD))
 431         return;
 432     ch = s->req[req_num] & DRCMR_CHLNUM;
 433
 434     if (!s->chan[ch].request && on)
 435         s->chan[ch].state |= DCSR_RASINTR;
 436     else
 437         s->chan[ch].state &= ~DCSR_RASINTR;
 438     if (s->chan[ch].request && !on)
 439         s->chan[ch].state |= DCSR_EORINT;
 440
 441     s->chan[ch].request = on;
 442     if (on) {
 443         pxa2xx_dma_run(s);
 444         pxa2xx_dma_update(s, ch);
 445     }
 446 }
 447
 448 static int pxa2xx_dma_init(SysBusDevice *dev)
 449 {
 450     int i;
 451     PXA2xxDMAState *s;
 452     s = FROM_SYSBUS(PXA2xxDMAState, dev);
 453
 454     if (s->channels <= 0) {
 455         return -1;
 456     }
 457
 458     s->chan = g_malloc0(sizeof(PXA2xxDMAChannel) * s->channels);
 459
 460     memset(s->chan, 0, sizeof(PXA2xxDMAChannel) * s->channels);
 461     for (i = 0; i < s->channels; i ++)
 462         s->chan[i].state = DCSR_STOPINTR;
 463
 464     memset(s->req, 0, sizeof(uint8_t) * PXA2XX_DMA_NUM_REQUESTS);
 465
 466     qdev_init_gpio_in(&dev->qdev, pxa2xx_dma_request, PXA2XX_DMA_NUM_REQUESTS);
 467
 468     memory_region_init_io(&s->iomem, &pxa2xx_dma_ops, s,
 469                           "pxa2xx.dma", 0x00010000);
 470     sysbus_init_mmio(dev, &s->iomem);
 471     sysbus_init_irq(dev, &s->irq);
 472
 473     return 0;
 474 }
 475
 476 DeviceState *pxa27x_dma_init(hwaddr base, qemu_irq irq)
 477 {
 478     DeviceState *dev;
 479
 480     dev = qdev_create(NULL, "pxa2xx-dma");
 481     qdev_prop_set_int32(dev, "channels", PXA27X_DMA_NUM_CHANNELS);
 482     qdev_init_nofail(dev);
 483
 484     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
 485     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, irq);
 486
 487     return dev;
 488 }
 489
 490 DeviceState *pxa255_dma_init(hwaddr base, qemu_irq irq)
 491 {
 492     DeviceState *dev;
 493
 494     dev = qdev_create(NULL, "pxa2xx-dma");
 495     qdev_prop_set_int32(dev, "channels", PXA27X_DMA_NUM_CHANNELS);
 496     qdev_init_nofail(dev);
 497
 498     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
 499     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, irq);
 500
 501     return dev;
 502 }
 503
 504 static bool is_version_0(void *opaque, int version_id)
 505 {
 506     return version_id == 0;
 507 }
 508
 509 static VMStateDescription vmstate_pxa2xx_dma_chan = {
 510     .name = "pxa2xx_dma_chan",
 511     .version_id = 1,
 512     .minimum_version_id = 1,
 513     .minimum_version_id_old = 1,
 514     .fields = (VMStateField[]) {
 515         VMSTATE_UINT32(descr, PXA2xxDMAChannel),
 516         VMSTATE_UINT32(src, PXA2xxDMAChannel),
 517         VMSTATE_UINT32(dest, PXA2xxDMAChannel),
 518         VMSTATE_UINT32(cmd, PXA2xxDMAChannel),
 519         VMSTATE_UINT32(state, PXA2xxDMAChannel),
 520         VMSTATE_INT32(request, PXA2xxDMAChannel),
 521         VMSTATE_END_OF_LIST(),
 522     },
 523 };
 524
 525 static VMStateDescription vmstate_pxa2xx_dma = {
 526     .name = "pxa2xx_dma",
 527     .version_id = 1,
 528     .minimum_version_id = 0,
 529     .minimum_version_id_old = 0,
 530     .fields = (VMStateField[]) {
 531         VMSTATE_UNUSED_TEST(is_version_0, 4),
 532         VMSTATE_UINT32(stopintr, PXA2xxDMAState),
 533         VMSTATE_UINT32(eorintr, PXA2xxDMAState),
 534         VMSTATE_UINT32(rasintr, PXA2xxDMAState),
 535         VMSTATE_UINT32(startintr, PXA2xxDMAState),
 536         VMSTATE_UINT32(endintr, PXA2xxDMAState),
 537         VMSTATE_UINT32(align, PXA2xxDMAState),
 538         VMSTATE_UINT32(pio, PXA2xxDMAState),
 539         VMSTATE_BUFFER(req, PXA2xxDMAState),
 540         VMSTATE_STRUCT_VARRAY_POINTER_INT32(chan, PXA2xxDMAState, channels,
 541                 vmstate_pxa2xx_dma_chan, PXA2xxDMAChannel),
 542         VMSTATE_END_OF_LIST(),
 543     },
 544 };
 545
 546 static Property pxa2xx_dma_properties[] = {
 547     DEFINE_PROP_INT32("channels", PXA2xxDMAState, channels, -1),
 548     DEFINE_PROP_END_OF_LIST(),
 549 };
 550
 551 static void pxa2xx_dma_class_init(ObjectClass *klass, void *data)
 552 {
 553     DeviceClass *dc = DEVICE_CLASS(klass);
 554     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 555
 556     k->init = pxa2xx_dma_init;
 557     dc->desc = "PXA2xx DMA controller";
 558     dc->vmsd = &vmstate_pxa2xx_dma;
 559     dc->props = pxa2xx_dma_properties;
 560 }
 561
 562 static const TypeInfo pxa2xx_dma_info = {
 563     .name          = "pxa2xx-dma",
 564     .parent        = TYPE_SYS_BUS_DEVICE,
 565     .instance_size = sizeof(PXA2xxDMAState),
 566     .class_init    = pxa2xx_dma_class_init,
 567 };
 568
 569 static void pxa2xx_dma_register_types(void)
 570 {
 571     type_register_static(&pxa2xx_dma_info);
 572 }
 573
 574 type_init(pxa2xx_dma_register_types)