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 "qapi/error.h"
  31 #include "qemu/log.h"
  32
  33 /*
  34  * On Sparc32, this is the ESP (NCR53C90) part of chip STP2000 (Master I/O),
  35  * also produced as NCR89C100. See
  36  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
  37  * and
  38  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR53C9X.txt
  39  */
  40
  41 static void esp_raise_irq(ESPState *s)
  42 {
  43     if (!(s->rregs[ESP_RSTAT] & STAT_INT)) {
  44         s->rregs[ESP_RSTAT] |= STAT_INT;
  45         qemu_irq_raise(s->irq);
  46         trace_esp_raise_irq();
  47     }
  48 }
  49
  50 static void esp_lower_irq(ESPState *s)
  51 {
  52     if (s->rregs[ESP_RSTAT] & STAT_INT) {
  53         s->rregs[ESP_RSTAT] &= ~STAT_INT;
  54         qemu_irq_lower(s->irq);
  55         trace_esp_lower_irq();
  56     }
  57 }
  58
  59 void esp_dma_enable(ESPState *s, int irq, int level)
  60 {
  61     if (level) {
  62         s->dma_enabled = 1;
  63         trace_esp_dma_enable();
  64         if (s->dma_cb) {
  65             s->dma_cb(s);
  66             s->dma_cb = NULL;
  67         }
  68     } else {
  69         trace_esp_dma_disable();
  70         s->dma_enabled = 0;
  71     }
  72 }
  73
  74 void esp_request_cancelled(SCSIRequest *req)
  75 {
  76     ESPState *s = req->hba_private;
  77
  78     if (req == s->current_req) {
  79         scsi_req_unref(s->current_req);
  80         s->current_req = NULL;
  81         s->current_dev = NULL;
  82     }
  83 }
  84
  85 static uint32_t get_cmd(ESPState *s, uint8_t *buf, uint8_t buflen)
  86 {
  87     uint32_t dmalen;
  88     int target;
  89
  90     target = s->wregs[ESP_WBUSID] & BUSID_DID;
  91     if (s->dma) {
  92         dmalen = s->rregs[ESP_TCLO];
  93         dmalen |= s->rregs[ESP_TCMID] << 8;
  94         dmalen |= s->rregs[ESP_TCHI] << 16;
  95         if (dmalen > buflen) {
  96             return 0;
  97         }
  98         s->dma_memory_read(s->dma_opaque, buf, dmalen);
  99     } else {
 100         dmalen = s->ti_size;
 101         if (dmalen > TI_BUFSZ) {
 102             return 0;
 103         }
 104         memcpy(buf, s->ti_buf, dmalen);
 105         buf[0] = buf[2] >> 5;
 106     }
 107     trace_esp_get_cmd(dmalen, target);
 108
 109     s->ti_size = 0;
 110     s->ti_rptr = 0;
 111     s->ti_wptr = 0;
 112
 113     if (s->current_req) {
 114         /* Started a new command before the old one finished.  Cancel it.  */
 115         scsi_req_cancel(s->current_req);
 116         s->async_len = 0;
 117     }
 118
 119     s->current_dev = scsi_device_find(&s->bus, 0, target, 0);
 120     if (!s->current_dev) {
 121         // No such drive
 122         s->rregs[ESP_RSTAT] = 0;
 123         s->rregs[ESP_RINTR] = INTR_DC;
 124         s->rregs[ESP_RSEQ] = SEQ_0;
 125         esp_raise_irq(s);
 126         return 0;
 127     }
 128     return dmalen;
 129 }
 130
 131 static void do_busid_cmd(ESPState *s, uint8_t *buf, uint8_t busid)
 132 {
 133     int32_t datalen;
 134     int lun;
 135     SCSIDevice *current_lun;
 136
 137     trace_esp_do_busid_cmd(busid);
 138     lun = busid & 7;
 139     current_lun = scsi_device_find(&s->bus, 0, s->current_dev->id, lun);
 140     s->current_req = scsi_req_new(current_lun, 0, lun, buf, s);
 141     datalen = scsi_req_enqueue(s->current_req);
 142     s->ti_size = datalen;
 143     if (datalen != 0) {
 144         s->rregs[ESP_RSTAT] = STAT_TC;
 145         s->dma_left = 0;
 146         s->dma_counter = 0;
 147         if (datalen > 0) {
 148             s->rregs[ESP_RSTAT] |= STAT_DI;
 149         } else {
 150             s->rregs[ESP_RSTAT] |= STAT_DO;
 151         }
 152         scsi_req_continue(s->current_req);
 153     }
 154     s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 155     s->rregs[ESP_RSEQ] = SEQ_CD;
 156     esp_raise_irq(s);
 157 }
 158
 159 static void do_cmd(ESPState *s, uint8_t *buf)
 160 {
 161     uint8_t busid = buf[0];
 162
 163     do_busid_cmd(s, &buf[1], busid);
 164 }
 165
 166 static void handle_satn(ESPState *s)
 167 {
 168     uint8_t buf[32];
 169     int len;
 170
 171     if (s->dma && !s->dma_enabled) {
 172         s->dma_cb = handle_satn;
 173         return;
 174     }
 175     len = get_cmd(s, buf, sizeof(buf));
 176     if (len)
 177         do_cmd(s, buf);
 178 }
 179
 180 static void handle_s_without_atn(ESPState *s)
 181 {
 182     uint8_t buf[32];
 183     int len;
 184
 185     if (s->dma && !s->dma_enabled) {
 186         s->dma_cb = handle_s_without_atn;
 187         return;
 188     }
 189     len = get_cmd(s, buf, sizeof(buf));
 190     if (len) {
 191         do_busid_cmd(s, buf, 0);
 192     }
 193 }
 194
 195 static void handle_satn_stop(ESPState *s)
 196 {
 197     if (s->dma && !s->dma_enabled) {
 198         s->dma_cb = handle_satn_stop;
 199         return;
 200     }
 201     s->cmdlen = get_cmd(s, s->cmdbuf, sizeof(s->cmdbuf));
 202     if (s->cmdlen) {
 203         trace_esp_handle_satn_stop(s->cmdlen);
 204         s->do_cmd = 1;
 205         s->rregs[ESP_RSTAT] = STAT_TC | STAT_CD;
 206         s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 207         s->rregs[ESP_RSEQ] = SEQ_CD;
 208         esp_raise_irq(s);
 209     }
 210 }
 211
 212 static void write_response(ESPState *s)
 213 {
 214     trace_esp_write_response(s->status);
 215     s->ti_buf[0] = s->status;
 216     s->ti_buf[1] = 0;
 217     if (s->dma) {
 218         s->dma_memory_write(s->dma_opaque, s->ti_buf, 2);
 219         s->rregs[ESP_RSTAT] = STAT_TC | STAT_ST;
 220         s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 221         s->rregs[ESP_RSEQ] = SEQ_CD;
 222     } else {
 223         s->ti_size = 2;
 224         s->ti_rptr = 0;
 225         s->ti_wptr = 2;
 226         s->rregs[ESP_RFLAGS] = 2;
 227     }
 228     esp_raise_irq(s);
 229 }
 230
 231 static void esp_dma_done(ESPState *s)
 232 {
 233     s->rregs[ESP_RSTAT] |= STAT_TC;
 234     s->rregs[ESP_RINTR] = INTR_BS;
 235     s->rregs[ESP_RSEQ] = 0;
 236     s->rregs[ESP_RFLAGS] = 0;
 237     s->rregs[ESP_TCLO] = 0;
 238     s->rregs[ESP_TCMID] = 0;
 239     s->rregs[ESP_TCHI] = 0;
 240     esp_raise_irq(s);
 241 }
 242
 243 static void esp_do_dma(ESPState *s)
 244 {
 245     uint32_t len;
 246     int to_device;
 247
 248     len = s->dma_left;
 249     if (s->do_cmd) {
 250         trace_esp_do_dma(s->cmdlen, len);
 251         assert (s->cmdlen <= sizeof(s->cmdbuf) &&
 252                 len <= sizeof(s->cmdbuf) - s->cmdlen);
 253         s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
 254         return;
 255     }
 256     if (s->async_len == 0) {
 257         /* Defer until data is available.  */
 258         return;
 259     }
 260     if (len > s->async_len) {
 261         len = s->async_len;
 262     }
 263     to_device = (s->ti_size < 0);
 264     if (to_device) {
 265         s->dma_memory_read(s->dma_opaque, s->async_buf, len);
 266     } else {
 267         s->dma_memory_write(s->dma_opaque, s->async_buf, len);
 268     }
 269     s->dma_left -= len;
 270     s->async_buf += len;
 271     s->async_len -= len;
 272     if (to_device)
 273         s->ti_size += len;
 274     else
 275         s->ti_size -= len;
 276     if (s->async_len == 0) {
 277         scsi_req_continue(s->current_req);
 278         /* If there is still data to be read from the device then
 279            complete the DMA operation immediately.  Otherwise defer
 280            until the scsi layer has completed.  */
 281         if (to_device || s->dma_left != 0 || s->ti_size == 0) {
 282             return;
 283         }
 284     }
 285
 286     /* Partially filled a scsi buffer. Complete immediately.  */
 287     esp_dma_done(s);
 288 }
 289
 290 void esp_command_complete(SCSIRequest *req, uint32_t status,
 291                                  size_t resid)
 292 {
 293     ESPState *s = req->hba_private;
 294
 295     trace_esp_command_complete();
 296     if (s->ti_size != 0) {
 297         trace_esp_command_complete_unexpected();
 298     }
 299     s->ti_size = 0;
 300     s->dma_left = 0;
 301     s->async_len = 0;
 302     if (status) {
 303         trace_esp_command_complete_fail();
 304     }
 305     s->status = status;
 306     s->rregs[ESP_RSTAT] = STAT_ST;
 307     esp_dma_done(s);
 308     if (s->current_req) {
 309         scsi_req_unref(s->current_req);
 310         s->current_req = NULL;
 311         s->current_dev = NULL;
 312     }
 313 }
 314
 315 void esp_transfer_data(SCSIRequest *req, uint32_t len)
 316 {
 317     ESPState *s = req->hba_private;
 318
 319     assert(!s->do_cmd);
 320     trace_esp_transfer_data(s->dma_left, s->ti_size);
 321     s->async_len = len;
 322     s->async_buf = scsi_req_get_buf(req);
 323     if (s->dma_left) {
 324         esp_do_dma(s);
 325     } else if (s->dma_counter != 0 && s->ti_size <= 0) {
 326         /* If this was the last part of a DMA transfer then the
 327            completion interrupt is deferred to here.  */
 328         esp_dma_done(s);
 329     }
 330 }
 331
 332 static void handle_ti(ESPState *s)
 333 {
 334     uint32_t dmalen, minlen;
 335
 336     if (s->dma && !s->dma_enabled) {
 337         s->dma_cb = handle_ti;
 338         return;
 339     }
 340
 341     dmalen = s->rregs[ESP_TCLO];
 342     dmalen |= s->rregs[ESP_TCMID] << 8;
 343     dmalen |= s->rregs[ESP_TCHI] << 16;
 344     if (dmalen==0) {
 345       dmalen=0x10000;
 346     }
 347     s->dma_counter = dmalen;
 348
 349     if (s->do_cmd)
 350         minlen = (dmalen < ESP_CMDBUF_SZ) ? dmalen : ESP_CMDBUF_SZ;
 351     else if (s->ti_size < 0)
 352         minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
 353     else
 354         minlen = (dmalen < s->ti_size) ? dmalen : s->ti_size;
 355     trace_esp_handle_ti(minlen);
 356     if (s->dma) {
 357         s->dma_left = minlen;
 358         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 359         esp_do_dma(s);
 360     }
 361     if (s->do_cmd) {
 362         trace_esp_handle_ti_cmd(s->cmdlen);
 363         s->ti_size = 0;
 364         s->cmdlen = 0;
 365         s->do_cmd = 0;
 366         do_cmd(s, s->cmdbuf);
 367     }
 368 }
 369
 370 void esp_hard_reset(ESPState *s)
 371 {
 372     memset(s->rregs, 0, ESP_REGS);
 373     memset(s->wregs, 0, ESP_REGS);
 374     s->tchi_written = 0;
 375     s->ti_size = 0;
 376     s->ti_rptr = 0;
 377     s->ti_wptr = 0;
 378     s->dma = 0;
 379     s->do_cmd = 0;
 380     s->dma_cb = NULL;
 381
 382     s->rregs[ESP_CFG1] = 7;
 383 }
 384
 385 static void esp_soft_reset(ESPState *s)
 386 {
 387     qemu_irq_lower(s->irq);
 388     esp_hard_reset(s);
 389 }
 390
 391 static void parent_esp_reset(ESPState *s, int irq, int level)
 392 {
 393     if (level) {
 394         esp_soft_reset(s);
 395     }
 396 }
 397
 398 uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
 399 {
 400     uint32_t old_val;
 401
 402     trace_esp_mem_readb(saddr, s->rregs[saddr]);
 403     switch (saddr) {
 404     case ESP_FIFO:
 405         if ((s->rregs[ESP_RSTAT] & STAT_PIO_MASK) == 0) {
 406             /* Data out.  */
 407             qemu_log_mask(LOG_UNIMP, "esp: PIO data read not implemented\n");
 408             s->rregs[ESP_FIFO] = 0;
 409         } else if (s->ti_rptr < s->ti_wptr) {
 410             s->ti_size--;
 411             s->rregs[ESP_FIFO] = s->ti_buf[s->ti_rptr++];
 412         }
 413         if (s->ti_rptr == s->ti_wptr) {
 414             s->ti_rptr = 0;
 415             s->ti_wptr = 0;
 416         }
 417         break;
 418     case ESP_RINTR:
 419         /* Clear sequence step, interrupt register and all status bits
 420            except TC */
 421         old_val = s->rregs[ESP_RINTR];
 422         s->rregs[ESP_RINTR] = 0;
 423         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 424         s->rregs[ESP_RSEQ] = SEQ_CD;
 425         esp_lower_irq(s);
 426
 427         return old_val;
 428     case ESP_TCHI:
 429         /* Return the unique id if the value has never been written */
 430         if (!s->tchi_written) {
 431             return s->chip_id;
 432         }
 433     default:
 434         break;
 435     }
 436     return s->rregs[saddr];
 437 }
 438
 439 void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val)
 440 {
 441     trace_esp_mem_writeb(saddr, s->wregs[saddr], val);
 442     switch (saddr) {
 443     case ESP_TCHI:
 444         s->tchi_written = true;
 445         /* fall through */
 446     case ESP_TCLO:
 447     case ESP_TCMID:
 448         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 449         break;
 450     case ESP_FIFO:
 451         if (s->do_cmd) {
 452             if (s->cmdlen < ESP_CMDBUF_SZ) {
 453                 s->cmdbuf[s->cmdlen++] = val & 0xff;
 454             } else {
 455                 trace_esp_error_fifo_overrun();
 456             }
 457         } else if (s->ti_wptr == TI_BUFSZ - 1) {
 458             trace_esp_error_fifo_overrun();
 459         } else {
 460             s->ti_size++;
 461             s->ti_buf[s->ti_wptr++] = val & 0xff;
 462         }
 463         break;
 464     case ESP_CMD:
 465         s->rregs[saddr] = val;
 466         if (val & CMD_DMA) {
 467             s->dma = 1;
 468             /* Reload DMA counter.  */
 469             s->rregs[ESP_TCLO] = s->wregs[ESP_TCLO];
 470             s->rregs[ESP_TCMID] = s->wregs[ESP_TCMID];
 471             s->rregs[ESP_TCHI] = s->wregs[ESP_TCHI];
 472         } else {
 473             s->dma = 0;
 474         }
 475         switch(val & CMD_CMD) {
 476         case CMD_NOP:
 477             trace_esp_mem_writeb_cmd_nop(val);
 478             break;
 479         case CMD_FLUSH:
 480             trace_esp_mem_writeb_cmd_flush(val);
 481             //s->ti_size = 0;
 482             s->rregs[ESP_RINTR] = INTR_FC;
 483             s->rregs[ESP_RSEQ] = 0;
 484             s->rregs[ESP_RFLAGS] = 0;
 485             break;
 486         case CMD_RESET:
 487             trace_esp_mem_writeb_cmd_reset(val);
 488             esp_soft_reset(s);
 489             break;
 490         case CMD_BUSRESET:
 491             trace_esp_mem_writeb_cmd_bus_reset(val);
 492             s->rregs[ESP_RINTR] = INTR_RST;
 493             if (!(s->wregs[ESP_CFG1] & CFG1_RESREPT)) {
 494                 esp_raise_irq(s);
 495             }
 496             break;
 497         case CMD_TI:
 498             handle_ti(s);
 499             break;
 500         case CMD_ICCS:
 501             trace_esp_mem_writeb_cmd_iccs(val);
 502             write_response(s);
 503             s->rregs[ESP_RINTR] = INTR_FC;
 504             s->rregs[ESP_RSTAT] |= STAT_MI;
 505             break;
 506         case CMD_MSGACC:
 507             trace_esp_mem_writeb_cmd_msgacc(val);
 508             s->rregs[ESP_RINTR] = INTR_DC;
 509             s->rregs[ESP_RSEQ] = 0;
 510             s->rregs[ESP_RFLAGS] = 0;
 511             esp_raise_irq(s);
 512             break;
 513         case CMD_PAD:
 514             trace_esp_mem_writeb_cmd_pad(val);
 515             s->rregs[ESP_RSTAT] = STAT_TC;
 516             s->rregs[ESP_RINTR] = INTR_FC;
 517             s->rregs[ESP_RSEQ] = 0;
 518             break;
 519         case CMD_SATN:
 520             trace_esp_mem_writeb_cmd_satn(val);
 521             break;
 522         case CMD_RSTATN:
 523             trace_esp_mem_writeb_cmd_rstatn(val);
 524             break;
 525         case CMD_SEL:
 526             trace_esp_mem_writeb_cmd_sel(val);
 527             handle_s_without_atn(s);
 528             break;
 529         case CMD_SELATN:
 530             trace_esp_mem_writeb_cmd_selatn(val);
 531             handle_satn(s);
 532             break;
 533         case CMD_SELATNS:
 534             trace_esp_mem_writeb_cmd_selatns(val);
 535             handle_satn_stop(s);
 536             break;
 537         case CMD_ENSEL:
 538             trace_esp_mem_writeb_cmd_ensel(val);
 539             s->rregs[ESP_RINTR] = 0;
 540             break;
 541         case CMD_DISSEL:
 542             trace_esp_mem_writeb_cmd_dissel(val);
 543             s->rregs[ESP_RINTR] = 0;
 544             esp_raise_irq(s);
 545             break;
 546         default:
 547             trace_esp_error_unhandled_command(val);
 548             break;
 549         }
 550         break;
 551     case ESP_WBUSID ... ESP_WSYNO:
 552         break;
 553     case ESP_CFG1:
 554     case ESP_CFG2: case ESP_CFG3:
 555     case ESP_RES3: case ESP_RES4:
 556         s->rregs[saddr] = val;
 557         break;
 558     case ESP_WCCF ... ESP_WTEST:
 559         break;
 560     default:
 561         trace_esp_error_invalid_write(val, saddr);
 562         return;
 563     }
 564     s->wregs[saddr] = val;
 565 }
 566
 567 static bool esp_mem_accepts(void *opaque, hwaddr addr,
 568                             unsigned size, bool is_write)
 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 #define TYPE_ESP "esp"
 596 #define ESP_STATE(obj) OBJECT_CHECK(SysBusESPState, (obj), TYPE_ESP)
 597
 598 typedef struct {
 599     /*< private >*/
 600     SysBusDevice parent_obj;
 601     /*< public >*/
 602
 603     MemoryRegion iomem;
 604     uint32_t it_shift;
 605     ESPState esp;
 606 } SysBusESPState;
 607
 608 static void sysbus_esp_mem_write(void *opaque, hwaddr addr,
 609                                  uint64_t val, unsigned int size)
 610 {
 611     SysBusESPState *sysbus = opaque;
 612     uint32_t saddr;
 613
 614     saddr = addr >> sysbus->it_shift;
 615     esp_reg_write(&sysbus->esp, saddr, val);
 616 }
 617
 618 static uint64_t sysbus_esp_mem_read(void *opaque, hwaddr addr,
 619                                     unsigned int size)
 620 {
 621     SysBusESPState *sysbus = opaque;
 622     uint32_t saddr;
 623
 624     saddr = addr >> sysbus->it_shift;
 625     return esp_reg_read(&sysbus->esp, saddr);
 626 }
 627
 628 static const MemoryRegionOps sysbus_esp_mem_ops = {
 629     .read = sysbus_esp_mem_read,
 630     .write = sysbus_esp_mem_write,
 631     .endianness = DEVICE_NATIVE_ENDIAN,
 632     .valid.accepts = esp_mem_accepts,
 633 };
 634
 635 void esp_init(hwaddr espaddr, int it_shift,
 636               ESPDMAMemoryReadWriteFunc dma_memory_read,
 637               ESPDMAMemoryReadWriteFunc dma_memory_write,
 638               void *dma_opaque, qemu_irq irq, qemu_irq *reset,
 639               qemu_irq *dma_enable)
 640 {
 641     DeviceState *dev;
 642     SysBusDevice *s;
 643     SysBusESPState *sysbus;
 644     ESPState *esp;
 645
 646     dev = qdev_create(NULL, TYPE_ESP);
 647     sysbus = ESP_STATE(dev);
 648     esp = &sysbus->esp;
 649     esp->dma_memory_read = dma_memory_read;
 650     esp->dma_memory_write = dma_memory_write;
 651     esp->dma_opaque = dma_opaque;
 652     sysbus->it_shift = it_shift;
 653     /* XXX for now until rc4030 has been changed to use DMA enable signal */
 654     esp->dma_enabled = 1;
 655     qdev_init_nofail(dev);
 656     s = SYS_BUS_DEVICE(dev);
 657     sysbus_connect_irq(s, 0, irq);
 658     sysbus_mmio_map(s, 0, espaddr);
 659     *reset = qdev_get_gpio_in(dev, 0);
 660     *dma_enable = qdev_get_gpio_in(dev, 1);
 661 }
 662
 663 static const struct SCSIBusInfo esp_scsi_info = {
 664     .tcq = false,
 665     .max_target = ESP_MAX_DEVS,
 666     .max_lun = 7,
 667
 668     .transfer_data = esp_transfer_data,
 669     .complete = esp_command_complete,
 670     .cancel = esp_request_cancelled
 671 };
 672
 673 static void sysbus_esp_gpio_demux(void *opaque, int irq, int level)
 674 {
 675     SysBusESPState *sysbus = ESP_STATE(opaque);
 676     ESPState *s = &sysbus->esp;
 677
 678     switch (irq) {
 679     case 0:
 680         parent_esp_reset(s, irq, level);
 681         break;
 682     case 1:
 683         esp_dma_enable(opaque, irq, level);
 684         break;
 685     }
 686 }
 687
 688 static void sysbus_esp_realize(DeviceState *dev, Error **errp)
 689 {
 690     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 691     SysBusESPState *sysbus = ESP_STATE(dev);
 692     ESPState *s = &sysbus->esp;
 693
 694     sysbus_init_irq(sbd, &s->irq);
 695     assert(sysbus->it_shift != -1);
 696
 697     s->chip_id = TCHI_FAS100A;
 698     memory_region_init_io(&sysbus->iomem, OBJECT(sysbus), &sysbus_esp_mem_ops,
 699                           sysbus, "esp", ESP_REGS << sysbus->it_shift);
 700     sysbus_init_mmio(sbd, &sysbus->iomem);
 701
 702     qdev_init_gpio_in(dev, sysbus_esp_gpio_demux, 2);
 703
 704     scsi_bus_new(&s->bus, sizeof(s->bus), dev, &esp_scsi_info, NULL);
 705 }
 706
 707 static void sysbus_esp_hard_reset(DeviceState *dev)
 708 {
 709     SysBusESPState *sysbus = ESP_STATE(dev);
 710     esp_hard_reset(&sysbus->esp);
 711 }
 712
 713 static const VMStateDescription vmstate_sysbus_esp_scsi = {
 714     .name = "sysbusespscsi",
 715     .version_id = 0,
 716     .minimum_version_id = 0,
 717     .fields = (VMStateField[]) {
 718         VMSTATE_STRUCT(esp, SysBusESPState, 0, vmstate_esp, ESPState),
 719         VMSTATE_END_OF_LIST()
 720     }
 721 };
 722
 723 static void sysbus_esp_class_init(ObjectClass *klass, void *data)
 724 {
 725     DeviceClass *dc = DEVICE_CLASS(klass);
 726
 727     dc->realize = sysbus_esp_realize;
 728     dc->reset = sysbus_esp_hard_reset;
 729     dc->vmsd = &vmstate_sysbus_esp_scsi;
 730     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 731 }
 732
 733 static const TypeInfo sysbus_esp_info = {
 734     .name          = TYPE_ESP,
 735     .parent        = TYPE_SYS_BUS_DEVICE,
 736     .instance_size = sizeof(SysBusESPState),
 737     .class_init    = sysbus_esp_class_init,
 738 };
 739
 740 static void esp_register_types(void)
 741 {
 742     type_register_static(&sysbus_esp_info);
 743 }
 744
 745 type_init(esp_register_types)