hw/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 "hw/sysbus.h"
  27 #include "hw/esp.h"
  28 #include "trace.h"
  29 #include "qemu/log.h"
  30
  31 /*
  32  * On Sparc32, this is the ESP (NCR53C90) part of chip STP2000 (Master I/O),
  33  * also produced as NCR89C100. See
  34  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
  35  * and
  36  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR53C9X.txt
  37  */
  38
  39 static void esp_raise_irq(ESPState *s)
  40 {
  41     if (!(s->rregs[ESP_RSTAT] & STAT_INT)) {
  42         s->rregs[ESP_RSTAT] |= STAT_INT;
  43         qemu_irq_raise(s->irq);
  44         trace_esp_raise_irq();
  45     }
  46 }
  47
  48 static void esp_lower_irq(ESPState *s)
  49 {
  50     if (s->rregs[ESP_RSTAT] & STAT_INT) {
  51         s->rregs[ESP_RSTAT] &= ~STAT_INT;
  52         qemu_irq_lower(s->irq);
  53         trace_esp_lower_irq();
  54     }
  55 }
  56
  57 void esp_dma_enable(ESPState *s, int irq, int level)
  58 {
  59     if (level) {
  60         s->dma_enabled = 1;
  61         trace_esp_dma_enable();
  62         if (s->dma_cb) {
  63             s->dma_cb(s);
  64             s->dma_cb = NULL;
  65         }
  66     } else {
  67         trace_esp_dma_disable();
  68         s->dma_enabled = 0;
  69     }
  70 }
  71
  72 void esp_request_cancelled(SCSIRequest *req)
  73 {
  74     ESPState *s = req->hba_private;
  75
  76     if (req == s->current_req) {
  77         scsi_req_unref(s->current_req);
  78         s->current_req = NULL;
  79         s->current_dev = NULL;
  80     }
  81 }
  82
  83 static uint32_t get_cmd(ESPState *s, uint8_t *buf)
  84 {
  85     uint32_t dmalen;
  86     int target;
  87
  88     target = s->wregs[ESP_WBUSID] & BUSID_DID;
  89     if (s->dma) {
  90         dmalen = s->rregs[ESP_TCLO];
  91         dmalen |= s->rregs[ESP_TCMID] << 8;
  92         dmalen |= s->rregs[ESP_TCHI] << 16;
  93         s->dma_memory_read(s->dma_opaque, buf, dmalen);
  94     } else {
  95         dmalen = s->ti_size;
  96         memcpy(buf, s->ti_buf, dmalen);
  97         buf[0] = buf[2] >> 5;
  98     }
  99     trace_esp_get_cmd(dmalen, target);
 100
 101     s->ti_size = 0;
 102     s->ti_rptr = 0;
 103     s->ti_wptr = 0;
 104
 105     if (s->current_req) {
 106         /* Started a new command before the old one finished.  Cancel it.  */
 107         scsi_req_cancel(s->current_req);
 108         s->async_len = 0;
 109     }
 110
 111     s->current_dev = scsi_device_find(&s->bus, 0, target, 0);
 112     if (!s->current_dev) {
 113         // No such drive
 114         s->rregs[ESP_RSTAT] = 0;
 115         s->rregs[ESP_RINTR] = INTR_DC;
 116         s->rregs[ESP_RSEQ] = SEQ_0;
 117         esp_raise_irq(s);
 118         return 0;
 119     }
 120     return dmalen;
 121 }
 122
 123 static void do_busid_cmd(ESPState *s, uint8_t *buf, uint8_t busid)
 124 {
 125     int32_t datalen;
 126     int lun;
 127     SCSIDevice *current_lun;
 128
 129     trace_esp_do_busid_cmd(busid);
 130     lun = busid & 7;
 131     current_lun = scsi_device_find(&s->bus, 0, s->current_dev->id, lun);
 132     s->current_req = scsi_req_new(current_lun, 0, lun, buf, s);
 133     datalen = scsi_req_enqueue(s->current_req);
 134     s->ti_size = datalen;
 135     if (datalen != 0) {
 136         s->rregs[ESP_RSTAT] = STAT_TC;
 137         s->dma_left = 0;
 138         s->dma_counter = 0;
 139         if (datalen > 0) {
 140             s->rregs[ESP_RSTAT] |= STAT_DI;
 141         } else {
 142             s->rregs[ESP_RSTAT] |= STAT_DO;
 143         }
 144         scsi_req_continue(s->current_req);
 145     }
 146     s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 147     s->rregs[ESP_RSEQ] = SEQ_CD;
 148     esp_raise_irq(s);
 149 }
 150
 151 static void do_cmd(ESPState *s, uint8_t *buf)
 152 {
 153     uint8_t busid = buf[0];
 154
 155     do_busid_cmd(s, &buf[1], busid);
 156 }
 157
 158 static void handle_satn(ESPState *s)
 159 {
 160     uint8_t buf[32];
 161     int len;
 162
 163     if (s->dma && !s->dma_enabled) {
 164         s->dma_cb = handle_satn;
 165         return;
 166     }
 167     len = get_cmd(s, buf);
 168     if (len)
 169         do_cmd(s, buf);
 170 }
 171
 172 static void handle_s_without_atn(ESPState *s)
 173 {
 174     uint8_t buf[32];
 175     int len;
 176
 177     if (s->dma && !s->dma_enabled) {
 178         s->dma_cb = handle_s_without_atn;
 179         return;
 180     }
 181     len = get_cmd(s, buf);
 182     if (len) {
 183         do_busid_cmd(s, buf, 0);
 184     }
 185 }
 186
 187 static void handle_satn_stop(ESPState *s)
 188 {
 189     if (s->dma && !s->dma_enabled) {
 190         s->dma_cb = handle_satn_stop;
 191         return;
 192     }
 193     s->cmdlen = get_cmd(s, s->cmdbuf);
 194     if (s->cmdlen) {
 195         trace_esp_handle_satn_stop(s->cmdlen);
 196         s->do_cmd = 1;
 197         s->rregs[ESP_RSTAT] = STAT_TC | STAT_CD;
 198         s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 199         s->rregs[ESP_RSEQ] = SEQ_CD;
 200         esp_raise_irq(s);
 201     }
 202 }
 203
 204 static void write_response(ESPState *s)
 205 {
 206     trace_esp_write_response(s->status);
 207     s->ti_buf[0] = s->status;
 208     s->ti_buf[1] = 0;
 209     if (s->dma) {
 210         s->dma_memory_write(s->dma_opaque, s->ti_buf, 2);
 211         s->rregs[ESP_RSTAT] = STAT_TC | STAT_ST;
 212         s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 213         s->rregs[ESP_RSEQ] = SEQ_CD;
 214     } else {
 215         s->ti_size = 2;
 216         s->ti_rptr = 0;
 217         s->ti_wptr = 0;
 218         s->rregs[ESP_RFLAGS] = 2;
 219     }
 220     esp_raise_irq(s);
 221 }
 222
 223 static void esp_dma_done(ESPState *s)
 224 {
 225     s->rregs[ESP_RSTAT] |= STAT_TC;
 226     s->rregs[ESP_RINTR] = INTR_BS;
 227     s->rregs[ESP_RSEQ] = 0;
 228     s->rregs[ESP_RFLAGS] = 0;
 229     s->rregs[ESP_TCLO] = 0;
 230     s->rregs[ESP_TCMID] = 0;
 231     s->rregs[ESP_TCHI] = 0;
 232     esp_raise_irq(s);
 233 }
 234
 235 static void esp_do_dma(ESPState *s)
 236 {
 237     uint32_t len;
 238     int to_device;
 239
 240     to_device = (s->ti_size < 0);
 241     len = s->dma_left;
 242     if (s->do_cmd) {
 243         trace_esp_do_dma(s->cmdlen, len);
 244         s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
 245         s->ti_size = 0;
 246         s->cmdlen = 0;
 247         s->do_cmd = 0;
 248         do_cmd(s, s->cmdbuf);
 249         return;
 250     }
 251     if (s->async_len == 0) {
 252         /* Defer until data is available.  */
 253         return;
 254     }
 255     if (len > s->async_len) {
 256         len = s->async_len;
 257     }
 258     if (to_device) {
 259         s->dma_memory_read(s->dma_opaque, s->async_buf, len);
 260     } else {
 261         s->dma_memory_write(s->dma_opaque, s->async_buf, len);
 262     }
 263     s->dma_left -= len;
 264     s->async_buf += len;
 265     s->async_len -= len;
 266     if (to_device)
 267         s->ti_size += len;
 268     else
 269         s->ti_size -= len;
 270     if (s->async_len == 0) {
 271         scsi_req_continue(s->current_req);
 272         /* If there is still data to be read from the device then
 273            complete the DMA operation immediately.  Otherwise defer
 274            until the scsi layer has completed.  */
 275         if (to_device || s->dma_left != 0 || s->ti_size == 0) {
 276             return;
 277         }
 278     }
 279
 280     /* Partially filled a scsi buffer. Complete immediately.  */
 281     esp_dma_done(s);
 282 }
 283
 284 void esp_command_complete(SCSIRequest *req, uint32_t status,
 285                                  size_t resid)
 286 {
 287     ESPState *s = req->hba_private;
 288
 289     trace_esp_command_complete();
 290     if (s->ti_size != 0) {
 291         trace_esp_command_complete_unexpected();
 292     }
 293     s->ti_size = 0;
 294     s->dma_left = 0;
 295     s->async_len = 0;
 296     if (status) {
 297         trace_esp_command_complete_fail();
 298     }
 299     s->status = status;
 300     s->rregs[ESP_RSTAT] = STAT_ST;
 301     esp_dma_done(s);
 302     if (s->current_req) {
 303         scsi_req_unref(s->current_req);
 304         s->current_req = NULL;
 305         s->current_dev = NULL;
 306     }
 307 }
 308
 309 void esp_transfer_data(SCSIRequest *req, uint32_t len)
 310 {
 311     ESPState *s = req->hba_private;
 312
 313     trace_esp_transfer_data(s->dma_left, s->ti_size);
 314     s->async_len = len;
 315     s->async_buf = scsi_req_get_buf(req);
 316     if (s->dma_left) {
 317         esp_do_dma(s);
 318     } else if (s->dma_counter != 0 && s->ti_size <= 0) {
 319         /* If this was the last part of a DMA transfer then the
 320            completion interrupt is deferred to here.  */
 321         esp_dma_done(s);
 322     }
 323 }
 324
 325 static void handle_ti(ESPState *s)
 326 {
 327     uint32_t dmalen, minlen;
 328
 329     if (s->dma && !s->dma_enabled) {
 330         s->dma_cb = handle_ti;
 331         return;
 332     }
 333
 334     dmalen = s->rregs[ESP_TCLO];
 335     dmalen |= s->rregs[ESP_TCMID] << 8;
 336     dmalen |= s->rregs[ESP_TCHI] << 16;
 337     if (dmalen==0) {
 338       dmalen=0x10000;
 339     }
 340     s->dma_counter = dmalen;
 341
 342     if (s->do_cmd)
 343         minlen = (dmalen < 32) ? dmalen : 32;
 344     else if (s->ti_size < 0)
 345         minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
 346     else
 347         minlen = (dmalen < s->ti_size) ? dmalen : s->ti_size;
 348     trace_esp_handle_ti(minlen);
 349     if (s->dma) {
 350         s->dma_left = minlen;
 351         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 352         esp_do_dma(s);
 353     } else if (s->do_cmd) {
 354         trace_esp_handle_ti_cmd(s->cmdlen);
 355         s->ti_size = 0;
 356         s->cmdlen = 0;
 357         s->do_cmd = 0;
 358         do_cmd(s, s->cmdbuf);
 359         return;
 360     }
 361 }
 362
 363 void esp_hard_reset(ESPState *s)
 364 {
 365     memset(s->rregs, 0, ESP_REGS);
 366     memset(s->wregs, 0, ESP_REGS);
 367     s->rregs[ESP_TCHI] = s->chip_id;
 368     s->ti_size = 0;
 369     s->ti_rptr = 0;
 370     s->ti_wptr = 0;
 371     s->dma = 0;
 372     s->do_cmd = 0;
 373     s->dma_cb = NULL;
 374
 375     s->rregs[ESP_CFG1] = 7;
 376 }
 377
 378 static void esp_soft_reset(ESPState *s)
 379 {
 380     qemu_irq_lower(s->irq);
 381     esp_hard_reset(s);
 382 }
 383
 384 static void parent_esp_reset(ESPState *s, int irq, int level)
 385 {
 386     if (level) {
 387         esp_soft_reset(s);
 388     }
 389 }
 390
 391 uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
 392 {
 393     uint32_t old_val;
 394
 395     trace_esp_mem_readb(saddr, s->rregs[saddr]);
 396     switch (saddr) {
 397     case ESP_FIFO:
 398         if (s->ti_size > 0) {
 399             s->ti_size--;
 400             if ((s->rregs[ESP_RSTAT] & STAT_PIO_MASK) == 0) {
 401                 /* Data out.  */
 402                 qemu_log_mask(LOG_UNIMP,
 403                               "esp: PIO data read not implemented\n");
 404                 s->rregs[ESP_FIFO] = 0;
 405             } else {
 406                 s->rregs[ESP_FIFO] = s->ti_buf[s->ti_rptr++];
 407             }
 408             esp_raise_irq(s);
 409         }
 410         if (s->ti_size == 0) {
 411             s->ti_rptr = 0;
 412             s->ti_wptr = 0;
 413         }
 414         break;
 415     case ESP_RINTR:
 416         /* Clear sequence step, interrupt register and all status bits
 417            except TC */
 418         old_val = s->rregs[ESP_RINTR];
 419         s->rregs[ESP_RINTR] = 0;
 420         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 421         s->rregs[ESP_RSEQ] = SEQ_CD;
 422         esp_lower_irq(s);
 423
 424         return old_val;
 425     default:
 426         break;
 427     }
 428     return s->rregs[saddr];
 429 }
 430
 431 void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val)
 432 {
 433     trace_esp_mem_writeb(saddr, s->wregs[saddr], val);
 434     switch (saddr) {
 435     case ESP_TCLO:
 436     case ESP_TCMID:
 437     case ESP_TCHI:
 438         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 439         break;
 440     case ESP_FIFO:
 441         if (s->do_cmd) {
 442             s->cmdbuf[s->cmdlen++] = val & 0xff;
 443         } else if (s->ti_size == TI_BUFSZ - 1) {
 444             trace_esp_error_fifo_overrun();
 445         } else {
 446             s->ti_size++;
 447             s->ti_buf[s->ti_wptr++] = val & 0xff;
 448         }
 449         break;
 450     case ESP_CMD:
 451         s->rregs[saddr] = val;
 452         if (val & CMD_DMA) {
 453             s->dma = 1;
 454             /* Reload DMA counter.  */
 455             s->rregs[ESP_TCLO] = s->wregs[ESP_TCLO];
 456             s->rregs[ESP_TCMID] = s->wregs[ESP_TCMID];
 457             s->rregs[ESP_TCHI] = s->wregs[ESP_TCHI];
 458         } else {
 459             s->dma = 0;
 460         }
 461         switch(val & CMD_CMD) {
 462         case CMD_NOP:
 463             trace_esp_mem_writeb_cmd_nop(val);
 464             break;
 465         case CMD_FLUSH:
 466             trace_esp_mem_writeb_cmd_flush(val);
 467             //s->ti_size = 0;
 468             s->rregs[ESP_RINTR] = INTR_FC;
 469             s->rregs[ESP_RSEQ] = 0;
 470             s->rregs[ESP_RFLAGS] = 0;
 471             break;
 472         case CMD_RESET:
 473             trace_esp_mem_writeb_cmd_reset(val);
 474             esp_soft_reset(s);
 475             break;
 476         case CMD_BUSRESET:
 477             trace_esp_mem_writeb_cmd_bus_reset(val);
 478             s->rregs[ESP_RINTR] = INTR_RST;
 479             if (!(s->wregs[ESP_CFG1] & CFG1_RESREPT)) {
 480                 esp_raise_irq(s);
 481             }
 482             break;
 483         case CMD_TI:
 484             handle_ti(s);
 485             break;
 486         case CMD_ICCS:
 487             trace_esp_mem_writeb_cmd_iccs(val);
 488             write_response(s);
 489             s->rregs[ESP_RINTR] = INTR_FC;
 490             s->rregs[ESP_RSTAT] |= STAT_MI;
 491             break;
 492         case CMD_MSGACC:
 493             trace_esp_mem_writeb_cmd_msgacc(val);
 494             s->rregs[ESP_RINTR] = INTR_DC;
 495             s->rregs[ESP_RSEQ] = 0;
 496             s->rregs[ESP_RFLAGS] = 0;
 497             esp_raise_irq(s);
 498             break;
 499         case CMD_PAD:
 500             trace_esp_mem_writeb_cmd_pad(val);
 501             s->rregs[ESP_RSTAT] = STAT_TC;
 502             s->rregs[ESP_RINTR] = INTR_FC;
 503             s->rregs[ESP_RSEQ] = 0;
 504             break;
 505         case CMD_SATN:
 506             trace_esp_mem_writeb_cmd_satn(val);
 507             break;
 508         case CMD_RSTATN:
 509             trace_esp_mem_writeb_cmd_rstatn(val);
 510             break;
 511         case CMD_SEL:
 512             trace_esp_mem_writeb_cmd_sel(val);
 513             handle_s_without_atn(s);
 514             break;
 515         case CMD_SELATN:
 516             trace_esp_mem_writeb_cmd_selatn(val);
 517             handle_satn(s);
 518             break;
 519         case CMD_SELATNS:
 520             trace_esp_mem_writeb_cmd_selatns(val);
 521             handle_satn_stop(s);
 522             break;
 523         case CMD_ENSEL:
 524             trace_esp_mem_writeb_cmd_ensel(val);
 525             s->rregs[ESP_RINTR] = 0;
 526             break;
 527         case CMD_DISSEL:
 528             trace_esp_mem_writeb_cmd_dissel(val);
 529             s->rregs[ESP_RINTR] = 0;
 530             esp_raise_irq(s);
 531             break;
 532         default:
 533             trace_esp_error_unhandled_command(val);
 534             break;
 535         }
 536         break;
 537     case ESP_WBUSID ... ESP_WSYNO:
 538         break;
 539     case ESP_CFG1:
 540     case ESP_CFG2: case ESP_CFG3:
 541     case ESP_RES3: case ESP_RES4:
 542         s->rregs[saddr] = val;
 543         break;
 544     case ESP_WCCF ... ESP_WTEST:
 545         break;
 546     default:
 547         trace_esp_error_invalid_write(val, saddr);
 548         return;
 549     }
 550     s->wregs[saddr] = val;
 551 }
 552
 553 static bool esp_mem_accepts(void *opaque, hwaddr addr,
 554                             unsigned size, bool is_write)
 555 {
 556     return (size == 1) || (is_write && size == 4);
 557 }
 558
 559 const VMStateDescription vmstate_esp = {
 560     .name ="esp",
 561     .version_id = 3,
 562     .minimum_version_id = 3,
 563     .minimum_version_id_old = 3,
 564     .fields      = (VMStateField []) {
 565         VMSTATE_BUFFER(rregs, ESPState),
 566         VMSTATE_BUFFER(wregs, ESPState),
 567         VMSTATE_INT32(ti_size, ESPState),
 568         VMSTATE_UINT32(ti_rptr, ESPState),
 569         VMSTATE_UINT32(ti_wptr, ESPState),
 570         VMSTATE_BUFFER(ti_buf, ESPState),
 571         VMSTATE_UINT32(status, ESPState),
 572         VMSTATE_UINT32(dma, ESPState),
 573         VMSTATE_BUFFER(cmdbuf, ESPState),
 574         VMSTATE_UINT32(cmdlen, ESPState),
 575         VMSTATE_UINT32(do_cmd, ESPState),
 576         VMSTATE_UINT32(dma_left, ESPState),
 577         VMSTATE_END_OF_LIST()
 578     }
 579 };
 580
 581 typedef struct {
 582     SysBusDevice busdev;
 583     MemoryRegion iomem;
 584     uint32_t it_shift;
 585     ESPState esp;
 586 } SysBusESPState;
 587
 588 static void sysbus_esp_mem_write(void *opaque, hwaddr addr,
 589                                  uint64_t val, unsigned int size)
 590 {
 591     SysBusESPState *sysbus = opaque;
 592     uint32_t saddr;
 593
 594     saddr = addr >> sysbus->it_shift;
 595     esp_reg_write(&sysbus->esp, saddr, val);
 596 }
 597
 598 static uint64_t sysbus_esp_mem_read(void *opaque, hwaddr addr,
 599                                     unsigned int size)
 600 {
 601     SysBusESPState *sysbus = opaque;
 602     uint32_t saddr;
 603
 604     saddr = addr >> sysbus->it_shift;
 605     return esp_reg_read(&sysbus->esp, saddr);
 606 }
 607
 608 static const MemoryRegionOps sysbus_esp_mem_ops = {
 609     .read = sysbus_esp_mem_read,
 610     .write = sysbus_esp_mem_write,
 611     .endianness = DEVICE_NATIVE_ENDIAN,
 612     .valid.accepts = esp_mem_accepts,
 613 };
 614
 615 void esp_init(hwaddr espaddr, int it_shift,
 616               ESPDMAMemoryReadWriteFunc dma_memory_read,
 617               ESPDMAMemoryReadWriteFunc dma_memory_write,
 618               void *dma_opaque, qemu_irq irq, qemu_irq *reset,
 619               qemu_irq *dma_enable)
 620 {
 621     DeviceState *dev;
 622     SysBusDevice *s;
 623     SysBusESPState *sysbus;
 624     ESPState *esp;
 625
 626     dev = qdev_create(NULL, "esp");
 627     sysbus = DO_UPCAST(SysBusESPState, busdev.qdev, dev);
 628     esp = &sysbus->esp;
 629     esp->dma_memory_read = dma_memory_read;
 630     esp->dma_memory_write = dma_memory_write;
 631     esp->dma_opaque = dma_opaque;
 632     sysbus->it_shift = it_shift;
 633     /* XXX for now until rc4030 has been changed to use DMA enable signal */
 634     esp->dma_enabled = 1;
 635     qdev_init_nofail(dev);
 636     s = SYS_BUS_DEVICE(dev);
 637     sysbus_connect_irq(s, 0, irq);
 638     sysbus_mmio_map(s, 0, espaddr);
 639     *reset = qdev_get_gpio_in(dev, 0);
 640     *dma_enable = qdev_get_gpio_in(dev, 1);
 641 }
 642
 643 static const struct SCSIBusInfo esp_scsi_info = {
 644     .tcq = false,
 645     .max_target = ESP_MAX_DEVS,
 646     .max_lun = 7,
 647
 648     .transfer_data = esp_transfer_data,
 649     .complete = esp_command_complete,
 650     .cancel = esp_request_cancelled
 651 };
 652
 653 static void sysbus_esp_gpio_demux(void *opaque, int irq, int level)
 654 {
 655     DeviceState *d = opaque;
 656     SysBusESPState *sysbus = container_of(d, SysBusESPState, busdev.qdev);
 657     ESPState *s = &sysbus->esp;
 658
 659     switch (irq) {
 660     case 0:
 661         parent_esp_reset(s, irq, level);
 662         break;
 663     case 1:
 664         esp_dma_enable(opaque, irq, level);
 665         break;
 666     }
 667 }
 668
 669 static int sysbus_esp_init(SysBusDevice *dev)
 670 {
 671     SysBusESPState *sysbus = FROM_SYSBUS(SysBusESPState, dev);
 672     ESPState *s = &sysbus->esp;
 673
 674     sysbus_init_irq(dev, &s->irq);
 675     assert(sysbus->it_shift != -1);
 676
 677     s->chip_id = TCHI_FAS100A;
 678     memory_region_init_io(&sysbus->iomem, &sysbus_esp_mem_ops, sysbus,
 679                           "esp", ESP_REGS << sysbus->it_shift);
 680     sysbus_init_mmio(dev, &sysbus->iomem);
 681
 682     qdev_init_gpio_in(&dev->qdev, sysbus_esp_gpio_demux, 2);
 683
 684     scsi_bus_new(&s->bus, &dev->qdev, &esp_scsi_info);
 685     return scsi_bus_legacy_handle_cmdline(&s->bus);
 686 }
 687
 688 static void sysbus_esp_hard_reset(DeviceState *dev)
 689 {
 690     SysBusESPState *sysbus = DO_UPCAST(SysBusESPState, busdev.qdev, dev);
 691     esp_hard_reset(&sysbus->esp);
 692 }
 693
 694 static const VMStateDescription vmstate_sysbus_esp_scsi = {
 695     .name = "sysbusespscsi",
 696     .version_id = 0,
 697     .minimum_version_id = 0,
 698     .minimum_version_id_old = 0,
 699     .fields = (VMStateField[]) {
 700         VMSTATE_STRUCT(esp, SysBusESPState, 0, vmstate_esp, ESPState),
 701         VMSTATE_END_OF_LIST()
 702     }
 703 };
 704
 705 static void sysbus_esp_class_init(ObjectClass *klass, void *data)
 706 {
 707     DeviceClass *dc = DEVICE_CLASS(klass);
 708     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 709
 710     k->init = sysbus_esp_init;
 711     dc->reset = sysbus_esp_hard_reset;
 712     dc->vmsd = &vmstate_sysbus_esp_scsi;
 713 }
 714
 715 static const TypeInfo sysbus_esp_info = {
 716     .name          = "esp",
 717     .parent        = TYPE_SYS_BUS_DEVICE,
 718     .instance_size = sizeof(SysBusESPState),
 719     .class_init    = sysbus_esp_class_init,
 720 };
 721
 722 static void esp_register_types(void)
 723 {
 724     type_register_static(&sysbus_esp_info);
 725 }
 726
 727 type_init(esp_register_types)