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.h"
  12 #include "pxa.h"
  13 #include "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     target_phys_addr_t descr;
  22     target_phys_addr_t src;
  23     target_phys_addr_t dest;
  24     uint32_t cmd;
  25     uint32_t state;
  26     int request;
  27 } PXA2xxDMAChannel;
  28
  29 typedef struct PXA2xxDMAState {
  30     SysBusDevice busdev;
  31     qemu_irq irq;
  32
  33     uint32_t stopintr;
  34     uint32_t eorintr;
  35     uint32_t rasintr;
  36     uint32_t startintr;
  37     uint32_t endintr;
  38
  39     uint32_t align;
  40     uint32_t pio;
  41
  42     int channels;
  43     PXA2xxDMAChannel *chan;
  44
  45     uint8_t req[PXA2XX_DMA_NUM_REQUESTS];
  46
  47     /* Flag to avoid recursive DMA invocations.  */
  48     int running;
  49 } PXA2xxDMAState;
  50
  51 #define DCSR0   0x0000  /* DMA Control / Status register for Channel 0 */
  52 #define DCSR31  0x007c  /* DMA Control / Status register for Channel 31 */
  53 #define DALGN   0x00a0  /* DMA Alignment register */
  54 #define DPCSR   0x00a4  /* DMA Programmed I/O Control Status register */
  55 #define DRQSR0  0x00e0  /* DMA DREQ<0> Status register */
  56 #define DRQSR1  0x00e4  /* DMA DREQ<1> Status register */
  57 #define DRQSR2  0x00e8  /* DMA DREQ<2> Status register */
  58 #define DINT    0x00f0  /* DMA Interrupt register */
  59 #define DRCMR0  0x0100  /* Request to Channel Map register 0 */
  60 #define DRCMR63 0x01fc  /* Request to Channel Map register 63 */
  61 #define D_CH0   0x0200  /* Channel 0 Descriptor start */
  62 #define DRCMR64 0x1100  /* Request to Channel Map register 64 */
  63 #define DRCMR74 0x1128  /* Request to Channel Map register 74 */
  64
  65 /* Per-channel register */
  66 #define DDADR   0x00
  67 #define DSADR   0x01
  68 #define DTADR   0x02
  69 #define DCMD    0x03
  70
  71 /* Bit-field masks */
  72 #define DRCMR_CHLNUM            0x1f
  73 #define DRCMR_MAPVLD            (1 << 7)
  74 #define DDADR_STOP              (1 << 0)
  75 #define DDADR_BREN              (1 << 1)
  76 #define DCMD_LEN                0x1fff
  77 #define DCMD_WIDTH(x)           (1 << ((((x) >> 14) & 3) - 1))
  78 #define DCMD_SIZE(x)            (4 << (((x) >> 16) & 3))
  79 #define DCMD_FLYBYT             (1 << 19)
  80 #define DCMD_FLYBYS             (1 << 20)
  81 #define DCMD_ENDIRQEN           (1 << 21)
  82 #define DCMD_STARTIRQEN         (1 << 22)
  83 #define DCMD_CMPEN              (1 << 25)
  84 #define DCMD_FLOWTRG            (1 << 28)
  85 #define DCMD_FLOWSRC            (1 << 29)
  86 #define DCMD_INCTRGADDR         (1 << 30)
  87 #define DCMD_INCSRCADDR         (1 << 31)
  88 #define DCSR_BUSERRINTR         (1 << 0)
  89 #define DCSR_STARTINTR          (1 << 1)
  90 #define DCSR_ENDINTR            (1 << 2)
  91 #define DCSR_STOPINTR           (1 << 3)
  92 #define DCSR_RASINTR            (1 << 4)
  93 #define DCSR_REQPEND            (1 << 8)
  94 #define DCSR_EORINT             (1 << 9)
  95 #define DCSR_CMPST              (1 << 10)
  96 #define DCSR_MASKRUN            (1 << 22)
  97 #define DCSR_RASIRQEN           (1 << 23)
  98 #define DCSR_CLRCMPST           (1 << 24)
  99 #define DCSR_SETCMPST           (1 << 25)
 100 #define DCSR_EORSTOPEN          (1 << 26)
 101 #define DCSR_EORJMPEN           (1 << 27)
 102 #define DCSR_EORIRQEN           (1 << 28)
 103 #define DCSR_STOPIRQEN          (1 << 29)
 104 #define DCSR_NODESCFETCH        (1 << 30)
 105 #define DCSR_RUN                (1 << 31)
 106
 107 static inline void pxa2xx_dma_update(PXA2xxDMAState *s, int ch)
 108 {
 109     if (ch >= 0) {
 110         if ((s->chan[ch].state & DCSR_STOPIRQEN) &&
 111                 (s->chan[ch].state & DCSR_STOPINTR))
 112             s->stopintr |= 1 << ch;
 113         else
 114             s->stopintr &= ~(1 << ch);
 115
 116         if ((s->chan[ch].state & DCSR_EORIRQEN) &&
 117                 (s->chan[ch].state & DCSR_EORINT))
 118             s->eorintr |= 1 << ch;
 119         else
 120             s->eorintr &= ~(1 << ch);
 121
 122         if ((s->chan[ch].state & DCSR_RASIRQEN) &&
 123                 (s->chan[ch].state & DCSR_RASINTR))
 124             s->rasintr |= 1 << ch;
 125         else
 126             s->rasintr &= ~(1 << ch);
 127
 128         if (s->chan[ch].state & DCSR_STARTINTR)
 129             s->startintr |= 1 << ch;
 130         else
 131             s->startintr &= ~(1 << ch);
 132
 133         if (s->chan[ch].state & DCSR_ENDINTR)
 134             s->endintr |= 1 << ch;
 135         else
 136             s->endintr &= ~(1 << ch);
 137     }
 138
 139     if (s->stopintr | s->eorintr | s->rasintr | s->startintr | s->endintr)
 140         qemu_irq_raise(s->irq);
 141     else
 142         qemu_irq_lower(s->irq);
 143 }
 144
 145 static inline void pxa2xx_dma_descriptor_fetch(
 146                 PXA2xxDMAState *s, int ch)
 147 {
 148     uint32_t desc[4];
 149     target_phys_addr_t daddr = s->chan[ch].descr & ~0xf;
 150     if ((s->chan[ch].descr & DDADR_BREN) && (s->chan[ch].state & DCSR_CMPST))
 151         daddr += 32;
 152
 153     cpu_physical_memory_read(daddr, (uint8_t *) desc, 16);
 154     s->chan[ch].descr = desc[DDADR];
 155     s->chan[ch].src = desc[DSADR];
 156     s->chan[ch].dest = desc[DTADR];
 157     s->chan[ch].cmd = desc[DCMD];
 158
 159     if (s->chan[ch].cmd & DCMD_FLOWSRC)
 160         s->chan[ch].src &= ~3;
 161     if (s->chan[ch].cmd & DCMD_FLOWTRG)
 162         s->chan[ch].dest &= ~3;
 163
 164     if (s->chan[ch].cmd & (DCMD_CMPEN | DCMD_FLYBYS | DCMD_FLYBYT))
 165         printf("%s: unsupported mode in channel %i\n", __FUNCTION__, ch);
 166
 167     if (s->chan[ch].cmd & DCMD_STARTIRQEN)
 168         s->chan[ch].state |= DCSR_STARTINTR;
 169 }
 170
 171 static void pxa2xx_dma_run(PXA2xxDMAState *s)
 172 {
 173     int c, srcinc, destinc;
 174     uint32_t n, size;
 175     uint32_t width;
 176     uint32_t length;
 177     uint8_t buffer[32];
 178     PXA2xxDMAChannel *ch;
 179
 180     if (s->running ++)
 181         return;
 182
 183     while (s->running) {
 184         s->running = 1;
 185         for (c = 0; c < s->channels; c ++) {
 186             ch = &s->chan[c];
 187
 188             while ((ch->state & DCSR_RUN) && !(ch->state & DCSR_STOPINTR)) {
 189                 /* Test for pending requests */
 190                 if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) && !ch->request)
 191                     break;
 192
 193                 length = ch->cmd & DCMD_LEN;
 194                 size = DCMD_SIZE(ch->cmd);
 195                 width = DCMD_WIDTH(ch->cmd);
 196
 197                 srcinc = (ch->cmd & DCMD_INCSRCADDR) ? width : 0;
 198                 destinc = (ch->cmd & DCMD_INCTRGADDR) ? width : 0;
 199
 200                 while (length) {
 201                     size = MIN(length, size);
 202
 203                     for (n = 0; n < size; n += width) {
 204                         cpu_physical_memory_read(ch->src, buffer + n, width);
 205                         ch->src += srcinc;
 206                     }
 207
 208                     for (n = 0; n < size; n += width) {
 209                         cpu_physical_memory_write(ch->dest, buffer + n, width);
 210                         ch->dest += destinc;
 211                     }
 212
 213                     length -= size;
 214
 215                     if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) &&
 216                             !ch->request) {
 217                         ch->state |= DCSR_EORINT;
 218                         if (ch->state & DCSR_EORSTOPEN)
 219                             ch->state |= DCSR_STOPINTR;
 220                         if ((ch->state & DCSR_EORJMPEN) &&
 221                                         !(ch->state & DCSR_NODESCFETCH))
 222                             pxa2xx_dma_descriptor_fetch(s, c);
 223                         break;
 224                     }
 225                 }
 226
 227                 ch->cmd = (ch->cmd & ~DCMD_LEN) | length;
 228
 229                 /* Is the transfer complete now? */
 230                 if (!length) {
 231                     if (ch->cmd & DCMD_ENDIRQEN)
 232                         ch->state |= DCSR_ENDINTR;
 233
 234                     if ((ch->state & DCSR_NODESCFETCH) ||
 235                                 (ch->descr & DDADR_STOP) ||
 236                                 (ch->state & DCSR_EORSTOPEN)) {
 237                         ch->state |= DCSR_STOPINTR;
 238                         ch->state &= ~DCSR_RUN;
 239
 240                         break;
 241                     }
 242
 243                     ch->state |= DCSR_STOPINTR;
 244                     break;
 245                 }
 246             }
 247         }
 248
 249         s->running --;
 250     }
 251 }
 252
 253 static uint32_t pxa2xx_dma_read(void *opaque, target_phys_addr_t offset)
 254 {
 255     PXA2xxDMAState *s = (PXA2xxDMAState *) opaque;
 256     unsigned int channel;
 257
 258     switch (offset) {
 259     case DRCMR64 ... DRCMR74:
 260         offset -= DRCMR64 - DRCMR0 - (64 << 2);
 261         /* Fall through */
 262     case DRCMR0 ... DRCMR63:
 263         channel = (offset - DRCMR0) >> 2;
 264         return s->req[channel];
 265
 266     case DRQSR0:
 267     case DRQSR1:
 268     case DRQSR2:
 269         return 0;
 270
 271     case DCSR0 ... DCSR31:
 272         channel = offset >> 2;
 273         if (s->chan[channel].request)
 274             return s->chan[channel].state | DCSR_REQPEND;
 275         return s->chan[channel].state;
 276
 277     case DINT:
 278         return s->stopintr | s->eorintr | s->rasintr |
 279                 s->startintr | s->endintr;
 280
 281     case DALGN:
 282         return s->align;
 283
 284     case DPCSR:
 285         return s->pio;
 286     }
 287
 288     if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) {
 289         channel = (offset - D_CH0) >> 4;
 290         switch ((offset & 0x0f) >> 2) {
 291         case DDADR:
 292             return s->chan[channel].descr;
 293         case DSADR:
 294             return s->chan[channel].src;
 295         case DTADR:
 296             return s->chan[channel].dest;
 297         case DCMD:
 298             return s->chan[channel].cmd;
 299         }
 300     }
 301
 302     hw_error("%s: Bad offset 0x" TARGET_FMT_plx "\n", __FUNCTION__, offset);
 303     return 7;
 304 }
 305
 306 static void pxa2xx_dma_write(void *opaque,
 307                  target_phys_addr_t offset, uint32_t value)
 308 {
 309     PXA2xxDMAState *s = (PXA2xxDMAState *) opaque;
 310     unsigned int channel;
 311
 312     switch (offset) {
 313     case DRCMR64 ... DRCMR74:
 314         offset -= DRCMR64 - DRCMR0 - (64 << 2);
 315         /* Fall through */
 316     case DRCMR0 ... DRCMR63:
 317         channel = (offset - DRCMR0) >> 2;
 318
 319         if (value & DRCMR_MAPVLD)
 320             if ((value & DRCMR_CHLNUM) > s->channels)
 321                 hw_error("%s: Bad DMA channel %i\n",
 322                          __FUNCTION__, value & DRCMR_CHLNUM);
 323
 324         s->req[channel] = value;
 325         break;
 326
 327     case DRQSR0:
 328     case DRQSR1:
 329     case DRQSR2:
 330         /* Nothing to do */
 331         break;
 332
 333     case DCSR0 ... DCSR31:
 334         channel = offset >> 2;
 335         s->chan[channel].state &= 0x0000071f & ~(value &
 336                         (DCSR_EORINT | DCSR_ENDINTR |
 337                          DCSR_STARTINTR | DCSR_BUSERRINTR));
 338         s->chan[channel].state |= value & 0xfc800000;
 339
 340         if (s->chan[channel].state & DCSR_STOPIRQEN)
 341             s->chan[channel].state &= ~DCSR_STOPINTR;
 342
 343         if (value & DCSR_NODESCFETCH) {
 344             /* No-descriptor-fetch mode */
 345             if (value & DCSR_RUN) {
 346                 s->chan[channel].state &= ~DCSR_STOPINTR;
 347                 pxa2xx_dma_run(s);
 348             }
 349         } else {
 350             /* Descriptor-fetch mode */
 351             if (value & DCSR_RUN) {
 352                 s->chan[channel].state &= ~DCSR_STOPINTR;
 353                 pxa2xx_dma_descriptor_fetch(s, channel);
 354                 pxa2xx_dma_run(s);
 355             }
 356         }
 357
 358         /* Shouldn't matter as our DMA is synchronous.  */
 359         if (!(value & (DCSR_RUN | DCSR_MASKRUN)))
 360             s->chan[channel].state |= DCSR_STOPINTR;
 361
 362         if (value & DCSR_CLRCMPST)
 363             s->chan[channel].state &= ~DCSR_CMPST;
 364         if (value & DCSR_SETCMPST)
 365             s->chan[channel].state |= DCSR_CMPST;
 366
 367         pxa2xx_dma_update(s, channel);
 368         break;
 369
 370     case DALGN:
 371         s->align = value;
 372         break;
 373
 374     case DPCSR:
 375         s->pio = value & 0x80000001;
 376         break;
 377
 378     default:
 379         if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) {
 380             channel = (offset - D_CH0) >> 4;
 381             switch ((offset & 0x0f) >> 2) {
 382             case DDADR:
 383                 s->chan[channel].descr = value;
 384                 break;
 385             case DSADR:
 386                 s->chan[channel].src = value;
 387                 break;
 388             case DTADR:
 389                 s->chan[channel].dest = value;
 390                 break;
 391             case DCMD:
 392                 s->chan[channel].cmd = value;
 393                 break;
 394             default:
 395                 goto fail;
 396             }
 397
 398             break;
 399         }
 400     fail:
 401         hw_error("%s: Bad offset " TARGET_FMT_plx "\n", __FUNCTION__, offset);
 402     }
 403 }
 404
 405 static uint32_t pxa2xx_dma_readbad(void *opaque, target_phys_addr_t offset)
 406 {
 407     hw_error("%s: Bad access width\n", __FUNCTION__);
 408     return 5;
 409 }
 410
 411 static void pxa2xx_dma_writebad(void *opaque,
 412                  target_phys_addr_t offset, uint32_t value)
 413 {
 414     hw_error("%s: Bad access width\n", __FUNCTION__);
 415 }
 416
 417 static CPUReadMemoryFunc * const pxa2xx_dma_readfn[] = {
 418     pxa2xx_dma_readbad,
 419     pxa2xx_dma_readbad,
 420     pxa2xx_dma_read
 421 };
 422
 423 static CPUWriteMemoryFunc * const pxa2xx_dma_writefn[] = {
 424     pxa2xx_dma_writebad,
 425     pxa2xx_dma_writebad,
 426     pxa2xx_dma_write
 427 };
 428
 429 static void pxa2xx_dma_request(void *opaque, int req_num, int on)
 430 {
 431     PXA2xxDMAState *s = opaque;
 432     int ch;
 433     if (req_num < 0 || req_num >= PXA2XX_DMA_NUM_REQUESTS)
 434         hw_error("%s: Bad DMA request %i\n", __FUNCTION__, req_num);
 435
 436     if (!(s->req[req_num] & DRCMR_MAPVLD))
 437         return;
 438     ch = s->req[req_num] & DRCMR_CHLNUM;
 439
 440     if (!s->chan[ch].request && on)
 441         s->chan[ch].state |= DCSR_RASINTR;
 442     else
 443         s->chan[ch].state &= ~DCSR_RASINTR;
 444     if (s->chan[ch].request && !on)
 445         s->chan[ch].state |= DCSR_EORINT;
 446
 447     s->chan[ch].request = on;
 448     if (on) {
 449         pxa2xx_dma_run(s);
 450         pxa2xx_dma_update(s, ch);
 451     }
 452 }
 453
 454 static int pxa2xx_dma_init(SysBusDevice *dev)
 455 {
 456     int i, iomemtype;
 457     PXA2xxDMAState *s;
 458     s = FROM_SYSBUS(PXA2xxDMAState, dev);
 459
 460     if (s->channels <= 0) {
 461         return -1;
 462     }
 463
 464     s->chan = qemu_mallocz(sizeof(PXA2xxDMAChannel) * s->channels);
 465
 466     memset(s->chan, 0, sizeof(PXA2xxDMAChannel) * s->channels);
 467     for (i = 0; i < s->channels; i ++)
 468         s->chan[i].state = DCSR_STOPINTR;
 469
 470     memset(s->req, 0, sizeof(uint8_t) * PXA2XX_DMA_NUM_REQUESTS);
 471
 472     qdev_init_gpio_in(&dev->qdev, pxa2xx_dma_request, PXA2XX_DMA_NUM_REQUESTS);
 473
 474     iomemtype = cpu_register_io_memory(pxa2xx_dma_readfn,
 475                     pxa2xx_dma_writefn, s, DEVICE_NATIVE_ENDIAN);
 476     sysbus_init_mmio(dev, 0x00010000, iomemtype);
 477     sysbus_init_irq(dev, &s->irq);
 478
 479     return 0;
 480 }
 481
 482 DeviceState *pxa27x_dma_init(target_phys_addr_t base, qemu_irq irq)
 483 {
 484     DeviceState *dev;
 485
 486     dev = qdev_create(NULL, "pxa2xx-dma");
 487     qdev_prop_set_int32(dev, "channels", PXA27X_DMA_NUM_CHANNELS);
 488     qdev_init_nofail(dev);
 489
 490     sysbus_mmio_map(sysbus_from_qdev(dev), 0, base);
 491     sysbus_connect_irq(sysbus_from_qdev(dev), 0, irq);
 492
 493     return dev;
 494 }
 495
 496 DeviceState *pxa255_dma_init(target_phys_addr_t base, qemu_irq irq)
 497 {
 498     DeviceState *dev;
 499
 500     dev = qdev_create(NULL, "pxa2xx-dma");
 501     qdev_prop_set_int32(dev, "channels", PXA27X_DMA_NUM_CHANNELS);
 502     qdev_init_nofail(dev);
 503
 504     sysbus_mmio_map(sysbus_from_qdev(dev), 0, base);
 505     sysbus_connect_irq(sysbus_from_qdev(dev), 0, irq);
 506
 507     return dev;
 508 }
 509
 510 static bool is_version_0(void *opaque, int version_id)
 511 {
 512     return version_id == 0;
 513 }
 514
 515 static VMStateDescription vmstate_pxa2xx_dma_chan = {
 516     .name = "pxa2xx_dma_chan",
 517     .version_id = 1,
 518     .minimum_version_id = 1,
 519     .minimum_version_id_old = 1,
 520     .fields = (VMStateField[]) {
 521         VMSTATE_UINTTL(descr, PXA2xxDMAChannel),
 522         VMSTATE_UINTTL(src, PXA2xxDMAChannel),
 523         VMSTATE_UINTTL(dest, PXA2xxDMAChannel),
 524         VMSTATE_UINT32(cmd, PXA2xxDMAChannel),
 525         VMSTATE_UINT32(state, PXA2xxDMAChannel),
 526         VMSTATE_INT32(request, PXA2xxDMAChannel),
 527         VMSTATE_END_OF_LIST(),
 528     },
 529 };
 530
 531 static VMStateDescription vmstate_pxa2xx_dma = {
 532     .name = "pxa2xx_dma",
 533     .version_id = 1,
 534     .minimum_version_id = 0,
 535     .minimum_version_id_old = 0,
 536     .fields = (VMStateField[]) {
 537         VMSTATE_UNUSED_TEST(is_version_0, 4),
 538         VMSTATE_UINT32(stopintr, PXA2xxDMAState),
 539         VMSTATE_UINT32(eorintr, PXA2xxDMAState),
 540         VMSTATE_UINT32(rasintr, PXA2xxDMAState),
 541         VMSTATE_UINT32(startintr, PXA2xxDMAState),
 542         VMSTATE_UINT32(endintr, PXA2xxDMAState),
 543         VMSTATE_UINT32(align, PXA2xxDMAState),
 544         VMSTATE_UINT32(pio, PXA2xxDMAState),
 545         VMSTATE_BUFFER(req, PXA2xxDMAState),
 546         VMSTATE_STRUCT_VARRAY_POINTER_INT32(chan, PXA2xxDMAState, channels,
 547                 vmstate_pxa2xx_dma_chan, PXA2xxDMAChannel),
 548         VMSTATE_END_OF_LIST(),
 549     },
 550 };
 551
 552 static SysBusDeviceInfo pxa2xx_dma_info = {
 553     .init       = pxa2xx_dma_init,
 554     .qdev.name  = "pxa2xx-dma",
 555     .qdev.desc  = "PXA2xx DMA controller",
 556     .qdev.size  = sizeof(PXA2xxDMAState),
 557     .qdev.vmsd  = &vmstate_pxa2xx_dma,
 558     .qdev.props = (Property[]) {
 559         DEFINE_PROP_INT32("channels", PXA2xxDMAState, channels, -1),
 560         DEFINE_PROP_END_OF_LIST(),
 561     },
 562 };
 563
 564 static void pxa2xx_dma_register(void)
 565 {
 566     sysbus_register_withprop(&pxa2xx_dma_info);
 567 }
 568 device_init(pxa2xx_dma_register);