hw/dma/xilinx_axidma.c

   1 /*
   2  * QEMU model of Xilinx AXI-DMA block.
   3  *
   4  * Copyright (c) 2011 Edgar E. Iglesias.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "hw/sysbus.h"
  26 #include "qemu/timer.h"
  27 #include "hw/ptimer.h"
  28 #include "qemu/log.h"
  29 #include "qemu/main-loop.h"
  30
  31 #include "hw/stream.h"
  32
  33 #define D(x)
  34
  35 #define TYPE_XILINX_AXI_DMA "xlnx.axi-dma"
  36 #define TYPE_XILINX_AXI_DMA_DATA_STREAM "xilinx-axi-dma-data-stream"
  37 #define TYPE_XILINX_AXI_DMA_CONTROL_STREAM "xilinx-axi-dma-control-stream"
  38
  39 #define XILINX_AXI_DMA(obj) \
  40      OBJECT_CHECK(XilinxAXIDMA, (obj), TYPE_XILINX_AXI_DMA)
  41
  42 #define XILINX_AXI_DMA_DATA_STREAM(obj) \
  43      OBJECT_CHECK(XilinxAXIDMAStreamSlave, (obj),\
  44      TYPE_XILINX_AXI_DMA_DATA_STREAM)
  45
  46 #define XILINX_AXI_DMA_CONTROL_STREAM(obj) \
  47      OBJECT_CHECK(XilinxAXIDMAStreamSlave, (obj),\
  48      TYPE_XILINX_AXI_DMA_CONTROL_STREAM)
  49
  50 #define R_DMACR             (0x00 / 4)
  51 #define R_DMASR             (0x04 / 4)
  52 #define R_CURDESC           (0x08 / 4)
  53 #define R_TAILDESC          (0x10 / 4)
  54 #define R_MAX               (0x30 / 4)
  55
  56 #define CONTROL_PAYLOAD_WORDS 5
  57 #define CONTROL_PAYLOAD_SIZE (CONTROL_PAYLOAD_WORDS * (sizeof(uint32_t)))
  58
  59 typedef struct XilinxAXIDMA XilinxAXIDMA;
  60 typedef struct XilinxAXIDMAStreamSlave XilinxAXIDMAStreamSlave;
  61
  62 enum {
  63     DMACR_RUNSTOP = 1,
  64     DMACR_TAILPTR_MODE = 2,
  65     DMACR_RESET = 4
  66 };
  67
  68 enum {
  69     DMASR_HALTED = 1,
  70     DMASR_IDLE  = 2,
  71     DMASR_IOC_IRQ  = 1 << 12,
  72     DMASR_DLY_IRQ  = 1 << 13,
  73
  74     DMASR_IRQ_MASK = 7 << 12
  75 };
  76
  77 struct SDesc {
  78     uint64_t nxtdesc;
  79     uint64_t buffer_address;
  80     uint64_t reserved;
  81     uint32_t control;
  82     uint32_t status;
  83     uint8_t app[CONTROL_PAYLOAD_SIZE];
  84 };
  85
  86 enum {
  87     SDESC_CTRL_EOF = (1 << 26),
  88     SDESC_CTRL_SOF = (1 << 27),
  89
  90     SDESC_CTRL_LEN_MASK = (1 << 23) - 1
  91 };
  92
  93 enum {
  94     SDESC_STATUS_EOF = (1 << 26),
  95     SDESC_STATUS_SOF_BIT = 27,
  96     SDESC_STATUS_SOF = (1 << SDESC_STATUS_SOF_BIT),
  97     SDESC_STATUS_COMPLETE = (1 << 31)
  98 };
  99
 100 struct Stream {
 101     QEMUBH *bh;
 102     ptimer_state *ptimer;
 103     qemu_irq irq;
 104
 105     int nr;
 106
 107     struct SDesc desc;
 108     int pos;
 109     unsigned int complete_cnt;
 110     uint32_t regs[R_MAX];
 111     uint8_t app[20];
 112 };
 113
 114 struct XilinxAXIDMAStreamSlave {
 115     Object parent;
 116
 117     struct XilinxAXIDMA *dma;
 118 };
 119
 120 struct XilinxAXIDMA {
 121     SysBusDevice busdev;
 122     MemoryRegion iomem;
 123     uint32_t freqhz;
 124     StreamSlave *tx_data_dev;
 125     StreamSlave *tx_control_dev;
 126     XilinxAXIDMAStreamSlave rx_data_dev;
 127     XilinxAXIDMAStreamSlave rx_control_dev;
 128
 129     struct Stream streams[2];
 130
 131     StreamCanPushNotifyFn notify;
 132     void *notify_opaque;
 133 };
 134
 135 /*
 136  * Helper calls to extract info from descriptors and other trivial
 137  * state from regs.
 138  */
 139 static inline int stream_desc_sof(struct SDesc *d)
 140 {
 141     return d->control & SDESC_CTRL_SOF;
 142 }
 143
 144 static inline int stream_desc_eof(struct SDesc *d)
 145 {
 146     return d->control & SDESC_CTRL_EOF;
 147 }
 148
 149 static inline int stream_resetting(struct Stream *s)
 150 {
 151     return !!(s->regs[R_DMACR] & DMACR_RESET);
 152 }
 153
 154 static inline int stream_running(struct Stream *s)
 155 {
 156     return s->regs[R_DMACR] & DMACR_RUNSTOP;
 157 }
 158
 159 static inline int stream_idle(struct Stream *s)
 160 {
 161     return !!(s->regs[R_DMASR] & DMASR_IDLE);
 162 }
 163
 164 static void stream_reset(struct Stream *s)
 165 {
 166     s->regs[R_DMASR] = DMASR_HALTED;  /* starts up halted.  */
 167     s->regs[R_DMACR] = 1 << 16; /* Starts with one in compl threshold.  */
 168 }
 169
 170 /* Map an offset addr into a channel index.  */
 171 static inline int streamid_from_addr(hwaddr addr)
 172 {
 173     int sid;
 174
 175     sid = addr / (0x30);
 176     sid &= 1;
 177     return sid;
 178 }
 179
 180 #ifdef DEBUG_ENET
 181 static void stream_desc_show(struct SDesc *d)
 182 {
 183     qemu_log("buffer_addr  = " PRIx64 "\n", d->buffer_address);
 184     qemu_log("nxtdesc      = " PRIx64 "\n", d->nxtdesc);
 185     qemu_log("control      = %x\n", d->control);
 186     qemu_log("status       = %x\n", d->status);
 187 }
 188 #endif
 189
 190 static void stream_desc_load(struct Stream *s, hwaddr addr)
 191 {
 192     struct SDesc *d = &s->desc;
 193
 194     cpu_physical_memory_read(addr, d, sizeof *d);
 195
 196     /* Convert from LE into host endianness.  */
 197     d->buffer_address = le64_to_cpu(d->buffer_address);
 198     d->nxtdesc = le64_to_cpu(d->nxtdesc);
 199     d->control = le32_to_cpu(d->control);
 200     d->status = le32_to_cpu(d->status);
 201 }
 202
 203 static void stream_desc_store(struct Stream *s, hwaddr addr)
 204 {
 205     struct SDesc *d = &s->desc;
 206
 207     /* Convert from host endianness into LE.  */
 208     d->buffer_address = cpu_to_le64(d->buffer_address);
 209     d->nxtdesc = cpu_to_le64(d->nxtdesc);
 210     d->control = cpu_to_le32(d->control);
 211     d->status = cpu_to_le32(d->status);
 212     cpu_physical_memory_write(addr, d, sizeof *d);
 213 }
 214
 215 static void stream_update_irq(struct Stream *s)
 216 {
 217     unsigned int pending, mask, irq;
 218
 219     pending = s->regs[R_DMASR] & DMASR_IRQ_MASK;
 220     mask = s->regs[R_DMACR] & DMASR_IRQ_MASK;
 221
 222     irq = pending & mask;
 223
 224     qemu_set_irq(s->irq, !!irq);
 225 }
 226
 227 static void stream_reload_complete_cnt(struct Stream *s)
 228 {
 229     unsigned int comp_th;
 230     comp_th = (s->regs[R_DMACR] >> 16) & 0xff;
 231     s->complete_cnt = comp_th;
 232 }
 233
 234 static void timer_hit(void *opaque)
 235 {
 236     struct Stream *s = opaque;
 237
 238     stream_reload_complete_cnt(s);
 239     s->regs[R_DMASR] |= DMASR_DLY_IRQ;
 240     stream_update_irq(s);
 241 }
 242
 243 static void stream_complete(struct Stream *s)
 244 {
 245     unsigned int comp_delay;
 246
 247     /* Start the delayed timer.  */
 248     comp_delay = s->regs[R_DMACR] >> 24;
 249     if (comp_delay) {
 250         ptimer_stop(s->ptimer);
 251         ptimer_set_count(s->ptimer, comp_delay);
 252         ptimer_run(s->ptimer, 1);
 253     }
 254
 255     s->complete_cnt--;
 256     if (s->complete_cnt == 0) {
 257         /* Raise the IOC irq.  */
 258         s->regs[R_DMASR] |= DMASR_IOC_IRQ;
 259         stream_reload_complete_cnt(s);
 260     }
 261 }
 262
 263 static void stream_process_mem2s(struct Stream *s, StreamSlave *tx_data_dev,
 264                                  StreamSlave *tx_control_dev)
 265 {
 266     uint32_t prev_d;
 267     unsigned char txbuf[16 * 1024];
 268     unsigned int txlen;
 269
 270     if (!stream_running(s) || stream_idle(s)) {
 271         return;
 272     }
 273
 274     while (1) {
 275         stream_desc_load(s, s->regs[R_CURDESC]);
 276
 277         if (s->desc.status & SDESC_STATUS_COMPLETE) {
 278             s->regs[R_DMASR] |= DMASR_HALTED;
 279             break;
 280         }
 281
 282         if (stream_desc_sof(&s->desc)) {
 283             s->pos = 0;
 284             stream_push(tx_control_dev, s->desc.app, sizeof(s->desc.app));
 285         }
 286
 287         txlen = s->desc.control & SDESC_CTRL_LEN_MASK;
 288         if ((txlen + s->pos) > sizeof txbuf) {
 289             hw_error("%s: too small internal txbuf! %d\n", __func__,
 290                      txlen + s->pos);
 291         }
 292
 293         cpu_physical_memory_read(s->desc.buffer_address,
 294                                  txbuf + s->pos, txlen);
 295         s->pos += txlen;
 296
 297         if (stream_desc_eof(&s->desc)) {
 298             stream_push(tx_data_dev, txbuf, s->pos);
 299             s->pos = 0;
 300             stream_complete(s);
 301         }
 302
 303         /* Update the descriptor.  */
 304         s->desc.status = txlen | SDESC_STATUS_COMPLETE;
 305         stream_desc_store(s, s->regs[R_CURDESC]);
 306
 307         /* Advance.  */
 308         prev_d = s->regs[R_CURDESC];
 309         s->regs[R_CURDESC] = s->desc.nxtdesc;
 310         if (prev_d == s->regs[R_TAILDESC]) {
 311             s->regs[R_DMASR] |= DMASR_IDLE;
 312             break;
 313         }
 314     }
 315 }
 316
 317 static size_t stream_process_s2mem(struct Stream *s, unsigned char *buf,
 318                                    size_t len)
 319 {
 320     uint32_t prev_d;
 321     unsigned int rxlen;
 322     size_t pos = 0;
 323     int sof = 1;
 324
 325     if (!stream_running(s) || stream_idle(s)) {
 326         return 0;
 327     }
 328
 329     while (len) {
 330         stream_desc_load(s, s->regs[R_CURDESC]);
 331
 332         if (s->desc.status & SDESC_STATUS_COMPLETE) {
 333             s->regs[R_DMASR] |= DMASR_HALTED;
 334             break;
 335         }
 336
 337         rxlen = s->desc.control & SDESC_CTRL_LEN_MASK;
 338         if (rxlen > len) {
 339             /* It fits.  */
 340             rxlen = len;
 341         }
 342
 343         cpu_physical_memory_write(s->desc.buffer_address, buf + pos, rxlen);
 344         len -= rxlen;
 345         pos += rxlen;
 346
 347         /* Update the descriptor.  */
 348         if (!len) {
 349             stream_complete(s);
 350             memcpy(s->desc.app, s->app, sizeof(s->desc.app));
 351             s->desc.status |= SDESC_STATUS_EOF;
 352         }
 353
 354         s->desc.status |= sof << SDESC_STATUS_SOF_BIT;
 355         s->desc.status |= SDESC_STATUS_COMPLETE;
 356         stream_desc_store(s, s->regs[R_CURDESC]);
 357         sof = 0;
 358
 359         /* Advance.  */
 360         prev_d = s->regs[R_CURDESC];
 361         s->regs[R_CURDESC] = s->desc.nxtdesc;
 362         if (prev_d == s->regs[R_TAILDESC]) {
 363             s->regs[R_DMASR] |= DMASR_IDLE;
 364             break;
 365         }
 366     }
 367
 368     return pos;
 369 }
 370
 371 static void xilinx_axidma_reset(DeviceState *dev)
 372 {
 373     int i;
 374     XilinxAXIDMA *s = XILINX_AXI_DMA(dev);
 375
 376     for (i = 0; i < 2; i++) {
 377         stream_reset(&s->streams[i]);
 378     }
 379 }
 380
 381 static size_t
 382 xilinx_axidma_control_stream_push(StreamSlave *obj, unsigned char *buf,
 383                                   size_t len)
 384 {
 385     XilinxAXIDMAStreamSlave *cs = XILINX_AXI_DMA_CONTROL_STREAM(obj);
 386     struct Stream *s = &cs->dma->streams[1];
 387
 388     if (len != CONTROL_PAYLOAD_SIZE) {
 389         hw_error("AXI DMA requires %d byte control stream payload\n",
 390                  (int)CONTROL_PAYLOAD_SIZE);
 391     }
 392
 393     memcpy(s->app, buf, len);
 394     return len;
 395 }
 396
 397 static bool
 398 xilinx_axidma_data_stream_can_push(StreamSlave *obj,
 399                                    StreamCanPushNotifyFn notify,
 400                                    void *notify_opaque)
 401 {
 402     XilinxAXIDMAStreamSlave *ds = XILINX_AXI_DMA_DATA_STREAM(obj);
 403     struct Stream *s = &ds->dma->streams[1];
 404
 405     if (!stream_running(s) || stream_idle(s)) {
 406         ds->dma->notify = notify;
 407         ds->dma->notify_opaque = notify_opaque;
 408         return false;
 409     }
 410
 411     return true;
 412 }
 413
 414 static size_t
 415 xilinx_axidma_data_stream_push(StreamSlave *obj, unsigned char *buf, size_t len)
 416 {
 417     XilinxAXIDMAStreamSlave *ds = XILINX_AXI_DMA_DATA_STREAM(obj);
 418     struct Stream *s = &ds->dma->streams[1];
 419     size_t ret;
 420
 421     ret = stream_process_s2mem(s, buf, len);
 422     stream_update_irq(s);
 423     return ret;
 424 }
 425
 426 static uint64_t axidma_read(void *opaque, hwaddr addr,
 427                             unsigned size)
 428 {
 429     XilinxAXIDMA *d = opaque;
 430     struct Stream *s;
 431     uint32_t r = 0;
 432     int sid;
 433
 434     sid = streamid_from_addr(addr);
 435     s = &d->streams[sid];
 436
 437     addr = addr % 0x30;
 438     addr >>= 2;
 439     switch (addr) {
 440         case R_DMACR:
 441             /* Simulate one cycles reset delay.  */
 442             s->regs[addr] &= ~DMACR_RESET;
 443             r = s->regs[addr];
 444             break;
 445         case R_DMASR:
 446             s->regs[addr] &= 0xffff;
 447             s->regs[addr] |= (s->complete_cnt & 0xff) << 16;
 448             s->regs[addr] |= (ptimer_get_count(s->ptimer) & 0xff) << 24;
 449             r = s->regs[addr];
 450             break;
 451         default:
 452             r = s->regs[addr];
 453             D(qemu_log("%s ch=%d addr=" TARGET_FMT_plx " v=%x\n",
 454                            __func__, sid, addr * 4, r));
 455             break;
 456     }
 457     return r;
 458
 459 }
 460
 461 static void axidma_write(void *opaque, hwaddr addr,
 462                          uint64_t value, unsigned size)
 463 {
 464     XilinxAXIDMA *d = opaque;
 465     struct Stream *s;
 466     int sid;
 467
 468     sid = streamid_from_addr(addr);
 469     s = &d->streams[sid];
 470
 471     addr = addr % 0x30;
 472     addr >>= 2;
 473     switch (addr) {
 474         case R_DMACR:
 475             /* Tailptr mode is always on.  */
 476             value |= DMACR_TAILPTR_MODE;
 477             /* Remember our previous reset state.  */
 478             value |= (s->regs[addr] & DMACR_RESET);
 479             s->regs[addr] = value;
 480
 481             if (value & DMACR_RESET) {
 482                 stream_reset(s);
 483             }
 484
 485             if ((value & 1) && !stream_resetting(s)) {
 486                 /* Start processing.  */
 487                 s->regs[R_DMASR] &= ~(DMASR_HALTED | DMASR_IDLE);
 488             }
 489             stream_reload_complete_cnt(s);
 490             break;
 491
 492         case R_DMASR:
 493             /* Mask away write to clear irq lines.  */
 494             value &= ~(value & DMASR_IRQ_MASK);
 495             s->regs[addr] = value;
 496             break;
 497
 498         case R_TAILDESC:
 499             s->regs[addr] = value;
 500             s->regs[R_DMASR] &= ~DMASR_IDLE; /* Not idle.  */
 501             if (!sid) {
 502                 stream_process_mem2s(s, d->tx_data_dev, d->tx_control_dev);
 503             }
 504             break;
 505         default:
 506             D(qemu_log("%s: ch=%d addr=" TARGET_FMT_plx " v=%x\n",
 507                   __func__, sid, addr * 4, (unsigned)value));
 508             s->regs[addr] = value;
 509             break;
 510     }
 511     if (sid == 1 && d->notify) {
 512         StreamCanPushNotifyFn notifytmp = d->notify;
 513         d->notify = NULL;
 514         notifytmp(d->notify_opaque);
 515     }
 516     stream_update_irq(s);
 517 }
 518
 519 static const MemoryRegionOps axidma_ops = {
 520     .read = axidma_read,
 521     .write = axidma_write,
 522     .endianness = DEVICE_NATIVE_ENDIAN,
 523 };
 524
 525 static void xilinx_axidma_realize(DeviceState *dev, Error **errp)
 526 {
 527     XilinxAXIDMA *s = XILINX_AXI_DMA(dev);
 528     XilinxAXIDMAStreamSlave *ds = XILINX_AXI_DMA_DATA_STREAM(&s->rx_data_dev);
 529     XilinxAXIDMAStreamSlave *cs = XILINX_AXI_DMA_CONTROL_STREAM(
 530                                                             &s->rx_control_dev);
 531     Error *local_err = NULL;
 532
 533     object_property_add_link(OBJECT(ds), "dma", TYPE_XILINX_AXI_DMA,
 534                              (Object **)&ds->dma,
 535                              object_property_allow_set_link,
 536                              OBJ_PROP_LINK_UNREF_ON_RELEASE,
 537                              &local_err);
 538     object_property_add_link(OBJECT(cs), "dma", TYPE_XILINX_AXI_DMA,
 539                              (Object **)&cs->dma,
 540                              object_property_allow_set_link,
 541                              OBJ_PROP_LINK_UNREF_ON_RELEASE,
 542                              &local_err);
 543     if (local_err) {
 544         goto xilinx_axidma_realize_fail;
 545     }
 546     object_property_set_link(OBJECT(ds), OBJECT(s), "dma", &local_err);
 547     object_property_set_link(OBJECT(cs), OBJECT(s), "dma", &local_err);
 548     if (local_err) {
 549         goto xilinx_axidma_realize_fail;
 550     }
 551
 552     int i;
 553
 554     for (i = 0; i < 2; i++) {
 555         struct Stream *st = &s->streams[i];
 556
 557         st->nr = i;
 558         st->bh = qemu_bh_new(timer_hit, st);
 559         st->ptimer = ptimer_init(st->bh);
 560         ptimer_set_freq(st->ptimer, s->freqhz);
 561     }
 562     return;
 563
 564 xilinx_axidma_realize_fail:
 565     if (!*errp) {
 566         *errp = local_err;
 567     }
 568 }
 569
 570 static void xilinx_axidma_init(Object *obj)
 571 {
 572     XilinxAXIDMA *s = XILINX_AXI_DMA(obj);
 573     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 574
 575     object_property_add_link(obj, "axistream-connected", TYPE_STREAM_SLAVE,
 576                              (Object **)&s->tx_data_dev,
 577                              qdev_prop_allow_set_link_before_realize,
 578                              OBJ_PROP_LINK_UNREF_ON_RELEASE,
 579                              &error_abort);
 580     object_property_add_link(obj, "axistream-control-connected",
 581                              TYPE_STREAM_SLAVE,
 582                              (Object **)&s->tx_control_dev,
 583                              qdev_prop_allow_set_link_before_realize,
 584                              OBJ_PROP_LINK_UNREF_ON_RELEASE,
 585                              &error_abort);
 586
 587     object_initialize(&s->rx_data_dev, sizeof(s->rx_data_dev),
 588                       TYPE_XILINX_AXI_DMA_DATA_STREAM);
 589     object_initialize(&s->rx_control_dev, sizeof(s->rx_control_dev),
 590                       TYPE_XILINX_AXI_DMA_CONTROL_STREAM);
 591     object_property_add_child(OBJECT(s), "axistream-connected-target",
 592                               (Object *)&s->rx_data_dev, &error_abort);
 593     object_property_add_child(OBJECT(s), "axistream-control-connected-target",
 594                               (Object *)&s->rx_control_dev, &error_abort);
 595
 596     sysbus_init_irq(sbd, &s->streams[0].irq);
 597     sysbus_init_irq(sbd, &s->streams[1].irq);
 598
 599     memory_region_init_io(&s->iomem, obj, &axidma_ops, s,
 600                           "xlnx.axi-dma", R_MAX * 4 * 2);
 601     sysbus_init_mmio(sbd, &s->iomem);
 602 }
 603
 604 static Property axidma_properties[] = {
 605     DEFINE_PROP_UINT32("freqhz", XilinxAXIDMA, freqhz, 50000000),
 606     DEFINE_PROP_END_OF_LIST(),
 607 };
 608
 609 static void axidma_class_init(ObjectClass *klass, void *data)
 610 {
 611     DeviceClass *dc = DEVICE_CLASS(klass);
 612
 613     dc->realize = xilinx_axidma_realize,
 614     dc->reset = xilinx_axidma_reset;
 615     dc->props = axidma_properties;
 616 }
 617
 618 static StreamSlaveClass xilinx_axidma_data_stream_class = {
 619     .push = xilinx_axidma_data_stream_push,
 620     .can_push = xilinx_axidma_data_stream_can_push,
 621 };
 622
 623 static StreamSlaveClass xilinx_axidma_control_stream_class = {
 624     .push = xilinx_axidma_control_stream_push,
 625 };
 626
 627 static void xilinx_axidma_stream_class_init(ObjectClass *klass, void *data)
 628 {
 629     StreamSlaveClass *ssc = STREAM_SLAVE_CLASS(klass);
 630
 631     ssc->push = ((StreamSlaveClass *)data)->push;
 632     ssc->can_push = ((StreamSlaveClass *)data)->can_push;
 633 }
 634
 635 static const TypeInfo axidma_info = {
 636     .name          = TYPE_XILINX_AXI_DMA,
 637     .parent        = TYPE_SYS_BUS_DEVICE,
 638     .instance_size = sizeof(XilinxAXIDMA),
 639     .class_init    = axidma_class_init,
 640     .instance_init = xilinx_axidma_init,
 641 };
 642
 643 static const TypeInfo xilinx_axidma_data_stream_info = {
 644     .name          = TYPE_XILINX_AXI_DMA_DATA_STREAM,
 645     .parent        = TYPE_OBJECT,
 646     .instance_size = sizeof(struct XilinxAXIDMAStreamSlave),
 647     .class_init    = xilinx_axidma_stream_class_init,
 648     .class_data    = &xilinx_axidma_data_stream_class,
 649     .interfaces = (InterfaceInfo[]) {
 650         { TYPE_STREAM_SLAVE },
 651         { }
 652     }
 653 };
 654
 655 static const TypeInfo xilinx_axidma_control_stream_info = {
 656     .name          = TYPE_XILINX_AXI_DMA_CONTROL_STREAM,
 657     .parent        = TYPE_OBJECT,
 658     .instance_size = sizeof(struct XilinxAXIDMAStreamSlave),
 659     .class_init    = xilinx_axidma_stream_class_init,
 660     .class_data    = &xilinx_axidma_control_stream_class,
 661     .interfaces = (InterfaceInfo[]) {
 662         { TYPE_STREAM_SLAVE },
 663         { }
 664     }
 665 };
 666
 667 static void xilinx_axidma_register_types(void)
 668 {
 669     type_register_static(&axidma_info);
 670     type_register_static(&xilinx_axidma_data_stream_info);
 671     type_register_static(&xilinx_axidma_control_stream_info);
 672 }
 673
 674 type_init(xilinx_axidma_register_types)