hw/scsi/esp.c

   1 /*
   2  * QEMU ESP/NCR53C9x emulation
   3  *
   4  * Copyright (c) 2005-2006 Fabrice Bellard
   5  * Copyright (c) 2012 Herve Poussineau
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "hw/sysbus.h"
  28 #include "hw/scsi/esp.h"
  29 #include "trace.h"
  30 #include "qemu/log.h"
  31
  32 /*
  33  * On Sparc32, this is the ESP (NCR53C90) part of chip STP2000 (Master I/O),
  34  * also produced as NCR89C100. See
  35  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
  36  * and
  37  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR53C9X.txt
  38  */
  39
  40 static void esp_raise_irq(ESPState *s)
  41 {
  42     if (!(s->rregs[ESP_RSTAT] & STAT_INT)) {
  43         s->rregs[ESP_RSTAT] |= STAT_INT;
  44         qemu_irq_raise(s->irq);
  45         trace_esp_raise_irq();
  46     }
  47 }
  48
  49 static void esp_lower_irq(ESPState *s)
  50 {
  51     if (s->rregs[ESP_RSTAT] & STAT_INT) {
  52         s->rregs[ESP_RSTAT] &= ~STAT_INT;
  53         qemu_irq_lower(s->irq);
  54         trace_esp_lower_irq();
  55     }
  56 }
  57
  58 void esp_dma_enable(ESPState *s, int irq, int level)
  59 {
  60     if (level) {
  61         s->dma_enabled = 1;
  62         trace_esp_dma_enable();
  63         if (s->dma_cb) {
  64             s->dma_cb(s);
  65             s->dma_cb = NULL;
  66         }
  67     } else {
  68         trace_esp_dma_disable();
  69         s->dma_enabled = 0;
  70     }
  71 }
  72
  73 void esp_request_cancelled(SCSIRequest *req)
  74 {
  75     ESPState *s = req->hba_private;
  76
  77     if (req == s->current_req) {
  78         scsi_req_unref(s->current_req);
  79         s->current_req = NULL;
  80         s->current_dev = NULL;
  81     }
  82 }
  83
  84 static uint32_t get_cmd(ESPState *s, uint8_t *buf, uint8_t buflen)
  85 {
  86     uint32_t dmalen;
  87     int target;
  88
  89     target = s->wregs[ESP_WBUSID] & BUSID_DID;
  90     if (s->dma) {
  91         dmalen = s->rregs[ESP_TCLO];
  92         dmalen |= s->rregs[ESP_TCMID] << 8;
  93         dmalen |= s->rregs[ESP_TCHI] << 16;
  94         if (dmalen > buflen) {
  95             return 0;
  96         }
  97         s->dma_memory_read(s->dma_opaque, buf, dmalen);
  98     } else {
  99         dmalen = s->ti_size;
 100         if (dmalen > TI_BUFSZ) {
 101             return 0;
 102         }
 103         memcpy(buf, s->ti_buf, dmalen);
 104         buf[0] = buf[2] >> 5;
 105     }
 106     trace_esp_get_cmd(dmalen, target);
 107
 108     s->ti_size = 0;
 109     s->ti_rptr = 0;
 110     s->ti_wptr = 0;
 111
 112     if (s->current_req) {
 113         /* Started a new command before the old one finished.  Cancel it.  */
 114         scsi_req_cancel(s->current_req);
 115         s->async_len = 0;
 116     }
 117
 118     s->current_dev = scsi_device_find(&s->bus, 0, target, 0);
 119     if (!s->current_dev) {
 120         // No such drive
 121         s->rregs[ESP_RSTAT] = 0;
 122         s->rregs[ESP_RINTR] = INTR_DC;
 123         s->rregs[ESP_RSEQ] = SEQ_0;
 124         esp_raise_irq(s);
 125         return 0;
 126     }
 127     return dmalen;
 128 }
 129
 130 static void do_busid_cmd(ESPState *s, uint8_t *buf, uint8_t busid)
 131 {
 132     int32_t datalen;
 133     int lun;
 134     SCSIDevice *current_lun;
 135
 136     trace_esp_do_busid_cmd(busid);
 137     lun = busid & 7;
 138     current_lun = scsi_device_find(&s->bus, 0, s->current_dev->id, lun);
 139     s->current_req = scsi_req_new(current_lun, 0, lun, buf, s);
 140     datalen = scsi_req_enqueue(s->current_req);
 141     s->ti_size = datalen;
 142     if (datalen != 0) {
 143         s->rregs[ESP_RSTAT] = STAT_TC;
 144         s->dma_left = 0;
 145         s->dma_counter = 0;
 146         if (datalen > 0) {
 147             s->rregs[ESP_RSTAT] |= STAT_DI;
 148         } else {
 149             s->rregs[ESP_RSTAT] |= STAT_DO;
 150         }
 151         scsi_req_continue(s->current_req);
 152     }
 153     s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 154     s->rregs[ESP_RSEQ] = SEQ_CD;
 155     esp_raise_irq(s);
 156 }
 157
 158 static void do_cmd(ESPState *s, uint8_t *buf)
 159 {
 160     uint8_t busid = buf[0];
 161
 162     do_busid_cmd(s, &buf[1], busid);
 163 }
 164
 165 static void handle_satn(ESPState *s)
 166 {
 167     uint8_t buf[32];
 168     int len;
 169
 170     if (s->dma && !s->dma_enabled) {
 171         s->dma_cb = handle_satn;
 172         return;
 173     }
 174     len = get_cmd(s, buf, sizeof(buf));
 175     if (len)
 176         do_cmd(s, buf);
 177 }
 178
 179 static void handle_s_without_atn(ESPState *s)
 180 {
 181     uint8_t buf[32];
 182     int len;
 183
 184     if (s->dma && !s->dma_enabled) {
 185         s->dma_cb = handle_s_without_atn;
 186         return;
 187     }
 188     len = get_cmd(s, buf, sizeof(buf));
 189     if (len) {
 190         do_busid_cmd(s, buf, 0);
 191     }
 192 }
 193
 194 static void handle_satn_stop(ESPState *s)
 195 {
 196     if (s->dma && !s->dma_enabled) {
 197         s->dma_cb = handle_satn_stop;
 198         return;
 199     }
 200     s->cmdlen = get_cmd(s, s->cmdbuf, sizeof(s->cmdbuf));
 201     if (s->cmdlen) {
 202         trace_esp_handle_satn_stop(s->cmdlen);
 203         s->do_cmd = 1;
 204         s->rregs[ESP_RSTAT] = STAT_TC | STAT_CD;
 205         s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 206         s->rregs[ESP_RSEQ] = SEQ_CD;
 207         esp_raise_irq(s);
 208     }
 209 }
 210
 211 static void write_response(ESPState *s)
 212 {
 213     trace_esp_write_response(s->status);
 214     s->ti_buf[0] = s->status;
 215     s->ti_buf[1] = 0;
 216     if (s->dma) {
 217         s->dma_memory_write(s->dma_opaque, s->ti_buf, 2);
 218         s->rregs[ESP_RSTAT] = STAT_TC | STAT_ST;
 219         s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 220         s->rregs[ESP_RSEQ] = SEQ_CD;
 221     } else {
 222         s->ti_size = 2;
 223         s->ti_rptr = 0;
 224         s->ti_wptr = 2;
 225         s->rregs[ESP_RFLAGS] = 2;
 226     }
 227     esp_raise_irq(s);
 228 }
 229
 230 static void esp_dma_done(ESPState *s)
 231 {
 232     s->rregs[ESP_RSTAT] |= STAT_TC;
 233     s->rregs[ESP_RINTR] = INTR_BS;
 234     s->rregs[ESP_RSEQ] = 0;
 235     s->rregs[ESP_RFLAGS] = 0;
 236     s->rregs[ESP_TCLO] = 0;
 237     s->rregs[ESP_TCMID] = 0;
 238     s->rregs[ESP_TCHI] = 0;
 239     esp_raise_irq(s);
 240 }
 241
 242 static void esp_do_dma(ESPState *s)
 243 {
 244     uint32_t len;
 245     int to_device;
 246
 247     len = s->dma_left;
 248     if (s->do_cmd) {
 249         trace_esp_do_dma(s->cmdlen, len);
 250         assert (s->cmdlen <= sizeof(s->cmdbuf) &&
 251                 len <= sizeof(s->cmdbuf) - s->cmdlen);
 252         s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
 253         return;
 254     }
 255     if (s->async_len == 0) {
 256         /* Defer until data is available.  */
 257         return;
 258     }
 259     if (len > s->async_len) {
 260         len = s->async_len;
 261     }
 262     to_device = (s->ti_size < 0);
 263     if (to_device) {
 264         s->dma_memory_read(s->dma_opaque, s->async_buf, len);
 265     } else {
 266         s->dma_memory_write(s->dma_opaque, s->async_buf, len);
 267     }
 268     s->dma_left -= len;
 269     s->async_buf += len;
 270     s->async_len -= len;
 271     if (to_device)
 272         s->ti_size += len;
 273     else
 274         s->ti_size -= len;
 275     if (s->async_len == 0) {
 276         scsi_req_continue(s->current_req);
 277         /* If there is still data to be read from the device then
 278            complete the DMA operation immediately.  Otherwise defer
 279            until the scsi layer has completed.  */
 280         if (to_device || s->dma_left != 0 || s->ti_size == 0) {
 281             return;
 282         }
 283     }
 284
 285     /* Partially filled a scsi buffer. Complete immediately.  */
 286     esp_dma_done(s);
 287 }
 288
 289 void esp_command_complete(SCSIRequest *req, uint32_t status,
 290                                  size_t resid)
 291 {
 292     ESPState *s = req->hba_private;
 293
 294     trace_esp_command_complete();
 295     if (s->ti_size != 0) {
 296         trace_esp_command_complete_unexpected();
 297     }
 298     s->ti_size = 0;
 299     s->dma_left = 0;
 300     s->async_len = 0;
 301     if (status) {
 302         trace_esp_command_complete_fail();
 303     }
 304     s->status = status;
 305     s->rregs[ESP_RSTAT] = STAT_ST;
 306     esp_dma_done(s);
 307     if (s->current_req) {
 308         scsi_req_unref(s->current_req);
 309         s->current_req = NULL;
 310         s->current_dev = NULL;
 311     }
 312 }
 313
 314 void esp_transfer_data(SCSIRequest *req, uint32_t len)
 315 {
 316     ESPState *s = req->hba_private;
 317
 318     assert(!s->do_cmd);
 319     trace_esp_transfer_data(s->dma_left, s->ti_size);
 320     s->async_len = len;
 321     s->async_buf = scsi_req_get_buf(req);
 322     if (s->dma_left) {
 323         esp_do_dma(s);
 324     } else if (s->dma_counter != 0 && s->ti_size <= 0) {
 325         /* If this was the last part of a DMA transfer then the
 326            completion interrupt is deferred to here.  */
 327         esp_dma_done(s);
 328     }
 329 }
 330
 331 static void handle_ti(ESPState *s)
 332 {
 333     uint32_t dmalen, minlen;
 334
 335     if (s->dma && !s->dma_enabled) {
 336         s->dma_cb = handle_ti;
 337         return;
 338     }
 339
 340     dmalen = s->rregs[ESP_TCLO];
 341     dmalen |= s->rregs[ESP_TCMID] << 8;
 342     dmalen |= s->rregs[ESP_TCHI] << 16;
 343     if (dmalen==0) {
 344       dmalen=0x10000;
 345     }
 346     s->dma_counter = dmalen;
 347
 348     if (s->do_cmd)
 349         minlen = (dmalen < ESP_CMDBUF_SZ) ? dmalen : ESP_CMDBUF_SZ;
 350     else if (s->ti_size < 0)
 351         minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
 352     else
 353         minlen = (dmalen < s->ti_size) ? dmalen : s->ti_size;
 354     trace_esp_handle_ti(minlen);
 355     if (s->dma) {
 356         s->dma_left = minlen;
 357         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 358         esp_do_dma(s);
 359     }
 360     if (s->do_cmd) {
 361         trace_esp_handle_ti_cmd(s->cmdlen);
 362         s->ti_size = 0;
 363         s->cmdlen = 0;
 364         s->do_cmd = 0;
 365         do_cmd(s, s->cmdbuf);
 366     }
 367 }
 368
 369 void esp_hard_reset(ESPState *s)
 370 {
 371     memset(s->rregs, 0, ESP_REGS);
 372     memset(s->wregs, 0, ESP_REGS);
 373     s->tchi_written = 0;
 374     s->ti_size = 0;
 375     s->ti_rptr = 0;
 376     s->ti_wptr = 0;
 377     s->dma = 0;
 378     s->do_cmd = 0;
 379     s->dma_cb = NULL;
 380
 381     s->rregs[ESP_CFG1] = 7;
 382 }
 383
 384 static void esp_soft_reset(ESPState *s)
 385 {
 386     qemu_irq_lower(s->irq);
 387     esp_hard_reset(s);
 388 }
 389
 390 static void parent_esp_reset(ESPState *s, int irq, int level)
 391 {
 392     if (level) {
 393         esp_soft_reset(s);
 394     }
 395 }
 396
 397 uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
 398 {
 399     uint32_t old_val;
 400
 401     trace_esp_mem_readb(saddr, s->rregs[saddr]);
 402     switch (saddr) {
 403     case ESP_FIFO:
 404         if ((s->rregs[ESP_RSTAT] & STAT_PIO_MASK) == 0) {
 405             /* Data out.  */
 406             qemu_log_mask(LOG_UNIMP, "esp: PIO data read not implemented\n");
 407             s->rregs[ESP_FIFO] = 0;
 408         } else if (s->ti_rptr < s->ti_wptr) {
 409             s->ti_size--;
 410             s->rregs[ESP_FIFO] = s->ti_buf[s->ti_rptr++];
 411         }
 412         if (s->ti_rptr == s->ti_wptr) {
 413             s->ti_rptr = 0;
 414             s->ti_wptr = 0;
 415         }
 416         break;
 417     case ESP_RINTR:
 418         /* Clear sequence step, interrupt register and all status bits
 419            except TC */
 420         old_val = s->rregs[ESP_RINTR];
 421         s->rregs[ESP_RINTR] = 0;
 422         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 423         s->rregs[ESP_RSEQ] = SEQ_CD;
 424         esp_lower_irq(s);
 425
 426         return old_val;
 427     case ESP_TCHI:
 428         /* Return the unique id if the value has never been written */
 429         if (!s->tchi_written) {
 430             return s->chip_id;
 431         }
 432     default:
 433         break;
 434     }
 435     return s->rregs[saddr];
 436 }
 437
 438 void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val)
 439 {
 440     trace_esp_mem_writeb(saddr, s->wregs[saddr], val);
 441     switch (saddr) {
 442     case ESP_TCHI:
 443         s->tchi_written = true;
 444         /* fall through */
 445     case ESP_TCLO:
 446     case ESP_TCMID:
 447         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 448         break;
 449     case ESP_FIFO:
 450         if (s->do_cmd) {
 451             if (s->cmdlen < ESP_CMDBUF_SZ) {
 452                 s->cmdbuf[s->cmdlen++] = val & 0xff;
 453             } else {
 454                 trace_esp_error_fifo_overrun();
 455             }
 456         } else if (s->ti_wptr == TI_BUFSZ - 1) {
 457             trace_esp_error_fifo_overrun();
 458         } else {
 459             s->ti_size++;
 460             s->ti_buf[s->ti_wptr++] = val & 0xff;
 461         }
 462         break;
 463     case ESP_CMD:
 464         s->rregs[saddr] = val;
 465         if (val & CMD_DMA) {
 466             s->dma = 1;
 467             /* Reload DMA counter.  */
 468             s->rregs[ESP_TCLO] = s->wregs[ESP_TCLO];
 469             s->rregs[ESP_TCMID] = s->wregs[ESP_TCMID];
 470             s->rregs[ESP_TCHI] = s->wregs[ESP_TCHI];
 471         } else {
 472             s->dma = 0;
 473         }
 474         switch(val & CMD_CMD) {
 475         case CMD_NOP:
 476             trace_esp_mem_writeb_cmd_nop(val);
 477             break;
 478         case CMD_FLUSH:
 479             trace_esp_mem_writeb_cmd_flush(val);
 480             //s->ti_size = 0;
 481             s->rregs[ESP_RINTR] = INTR_FC;
 482             s->rregs[ESP_RSEQ] = 0;
 483             s->rregs[ESP_RFLAGS] = 0;
 484             break;
 485         case CMD_RESET:
 486             trace_esp_mem_writeb_cmd_reset(val);
 487             esp_soft_reset(s);
 488             break;
 489         case CMD_BUSRESET:
 490             trace_esp_mem_writeb_cmd_bus_reset(val);
 491             s->rregs[ESP_RINTR] = INTR_RST;
 492             if (!(s->wregs[ESP_CFG1] & CFG1_RESREPT)) {
 493                 esp_raise_irq(s);
 494             }
 495             break;
 496         case CMD_TI:
 497             handle_ti(s);
 498             break;
 499         case CMD_ICCS:
 500             trace_esp_mem_writeb_cmd_iccs(val);
 501             write_response(s);
 502             s->rregs[ESP_RINTR] = INTR_FC;
 503             s->rregs[ESP_RSTAT] |= STAT_MI;
 504             break;
 505         case CMD_MSGACC:
 506             trace_esp_mem_writeb_cmd_msgacc(val);
 507             s->rregs[ESP_RINTR] = INTR_DC;
 508             s->rregs[ESP_RSEQ] = 0;
 509             s->rregs[ESP_RFLAGS] = 0;
 510             esp_raise_irq(s);
 511             break;
 512         case CMD_PAD:
 513             trace_esp_mem_writeb_cmd_pad(val);
 514             s->rregs[ESP_RSTAT] = STAT_TC;
 515             s->rregs[ESP_RINTR] = INTR_FC;
 516             s->rregs[ESP_RSEQ] = 0;
 517             break;
 518         case CMD_SATN:
 519             trace_esp_mem_writeb_cmd_satn(val);
 520             break;
 521         case CMD_RSTATN:
 522             trace_esp_mem_writeb_cmd_rstatn(val);
 523             break;
 524         case CMD_SEL:
 525             trace_esp_mem_writeb_cmd_sel(val);
 526             handle_s_without_atn(s);
 527             break;
 528         case CMD_SELATN:
 529             trace_esp_mem_writeb_cmd_selatn(val);
 530             handle_satn(s);
 531             break;
 532         case CMD_SELATNS:
 533             trace_esp_mem_writeb_cmd_selatns(val);
 534             handle_satn_stop(s);
 535             break;
 536         case CMD_ENSEL:
 537             trace_esp_mem_writeb_cmd_ensel(val);
 538             s->rregs[ESP_RINTR] = 0;
 539             break;
 540         case CMD_DISSEL:
 541             trace_esp_mem_writeb_cmd_dissel(val);
 542             s->rregs[ESP_RINTR] = 0;
 543             esp_raise_irq(s);
 544             break;
 545         default:
 546             trace_esp_error_unhandled_command(val);
 547             break;
 548         }
 549         break;
 550     case ESP_WBUSID ... ESP_WSYNO:
 551         break;
 552     case ESP_CFG1:
 553     case ESP_CFG2: case ESP_CFG3:
 554     case ESP_RES3: case ESP_RES4:
 555         s->rregs[saddr] = val;
 556         break;
 557     case ESP_WCCF ... ESP_WTEST:
 558         break;
 559     default:
 560         trace_esp_error_invalid_write(val, saddr);
 561         return;
 562     }
 563     s->wregs[saddr] = val;
 564 }
 565
 566 static bool esp_mem_accepts(void *opaque, hwaddr addr,
 567                             unsigned size, bool is_write,
 568                             MemTxAttrs attrs)
 569 {
 570     return (size == 1) || (is_write && size == 4);
 571 }
 572
 573 const VMStateDescription vmstate_esp = {
 574     .name ="esp",
 575     .version_id = 4,
 576     .minimum_version_id = 3,
 577     .fields = (VMStateField[]) {
 578         VMSTATE_BUFFER(rregs, ESPState),
 579         VMSTATE_BUFFER(wregs, ESPState),
 580         VMSTATE_INT32(ti_size, ESPState),
 581         VMSTATE_UINT32(ti_rptr, ESPState),
 582         VMSTATE_UINT32(ti_wptr, ESPState),
 583         VMSTATE_BUFFER(ti_buf, ESPState),
 584         VMSTATE_UINT32(status, ESPState),
 585         VMSTATE_UINT32(dma, ESPState),
 586         VMSTATE_PARTIAL_BUFFER(cmdbuf, ESPState, 16),
 587         VMSTATE_BUFFER_START_MIDDLE_V(cmdbuf, ESPState, 16, 4),
 588         VMSTATE_UINT32(cmdlen, ESPState),
 589         VMSTATE_UINT32(do_cmd, ESPState),
 590         VMSTATE_UINT32(dma_left, ESPState),
 591         VMSTATE_END_OF_LIST()
 592     }
 593 };
 594
 595 static void sysbus_esp_mem_write(void *opaque, hwaddr addr,
 596                                  uint64_t val, unsigned int size)
 597 {
 598     SysBusESPState *sysbus = opaque;
 599     uint32_t saddr;
 600
 601     saddr = addr >> sysbus->it_shift;
 602     esp_reg_write(&sysbus->esp, saddr, val);
 603 }
 604
 605 static uint64_t sysbus_esp_mem_read(void *opaque, hwaddr addr,
 606                                     unsigned int size)
 607 {
 608     SysBusESPState *sysbus = opaque;
 609     uint32_t saddr;
 610
 611     saddr = addr >> sysbus->it_shift;
 612     return esp_reg_read(&sysbus->esp, saddr);
 613 }
 614
 615 static const MemoryRegionOps sysbus_esp_mem_ops = {
 616     .read = sysbus_esp_mem_read,
 617     .write = sysbus_esp_mem_write,
 618     .endianness = DEVICE_NATIVE_ENDIAN,
 619     .valid.accepts = esp_mem_accepts,
 620 };
 621
 622 static const struct SCSIBusInfo esp_scsi_info = {
 623     .tcq = false,
 624     .max_target = ESP_MAX_DEVS,
 625     .max_lun = 7,
 626
 627     .transfer_data = esp_transfer_data,
 628     .complete = esp_command_complete,
 629     .cancel = esp_request_cancelled
 630 };
 631
 632 static void sysbus_esp_gpio_demux(void *opaque, int irq, int level)
 633 {
 634     SysBusESPState *sysbus = ESP_STATE(opaque);
 635     ESPState *s = &sysbus->esp;
 636
 637     switch (irq) {
 638     case 0:
 639         parent_esp_reset(s, irq, level);
 640         break;
 641     case 1:
 642         esp_dma_enable(opaque, irq, level);
 643         break;
 644     }
 645 }
 646
 647 static void sysbus_esp_realize(DeviceState *dev, Error **errp)
 648 {
 649     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 650     SysBusESPState *sysbus = ESP_STATE(dev);
 651     ESPState *s = &sysbus->esp;
 652
 653     sysbus_init_irq(sbd, &s->irq);
 654     assert(sysbus->it_shift != -1);
 655
 656     s->chip_id = TCHI_FAS100A;
 657     memory_region_init_io(&sysbus->iomem, OBJECT(sysbus), &sysbus_esp_mem_ops,
 658                           sysbus, "esp", ESP_REGS << sysbus->it_shift);
 659     sysbus_init_mmio(sbd, &sysbus->iomem);
 660
 661     qdev_init_gpio_in(dev, sysbus_esp_gpio_demux, 2);
 662
 663     scsi_bus_new(&s->bus, sizeof(s->bus), dev, &esp_scsi_info, NULL);
 664 }
 665
 666 static void sysbus_esp_hard_reset(DeviceState *dev)
 667 {
 668     SysBusESPState *sysbus = ESP_STATE(dev);
 669     esp_hard_reset(&sysbus->esp);
 670 }
 671
 672 static const VMStateDescription vmstate_sysbus_esp_scsi = {
 673     .name = "sysbusespscsi",
 674     .version_id = 0,
 675     .minimum_version_id = 0,
 676     .fields = (VMStateField[]) {
 677         VMSTATE_STRUCT(esp, SysBusESPState, 0, vmstate_esp, ESPState),
 678         VMSTATE_END_OF_LIST()
 679     }
 680 };
 681
 682 static void sysbus_esp_class_init(ObjectClass *klass, void *data)
 683 {
 684     DeviceClass *dc = DEVICE_CLASS(klass);
 685
 686     dc->realize = sysbus_esp_realize;
 687     dc->reset = sysbus_esp_hard_reset;
 688     dc->vmsd = &vmstate_sysbus_esp_scsi;
 689     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 690 }
 691
 692 static const TypeInfo sysbus_esp_info = {
 693     .name          = TYPE_ESP,
 694     .parent        = TYPE_SYS_BUS_DEVICE,
 695     .instance_size = sizeof(SysBusESPState),
 696     .class_init    = sysbus_esp_class_init,
 697 };
 698
 699 static void esp_register_types(void)
 700 {
 701     type_register_static(&sysbus_esp_info);
 702 }
 703
 704 type_init(esp_register_types)