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 = 0;
 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     to_device = (s->ti_size < 0);
 249     len = s->dma_left;
 250     if (s->do_cmd) {
 251         trace_esp_do_dma(s->cmdlen, len);
 252         s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
 253         s->ti_size = 0;
 254         s->cmdlen = 0;
 255         s->do_cmd = 0;
 256         do_cmd(s, s->cmdbuf);
 257         return;
 258     }
 259     if (s->async_len == 0) {
 260         /* Defer until data is available.  */
 261         return;
 262     }
 263     if (len > s->async_len) {
 264         len = s->async_len;
 265     }
 266     if (to_device) {
 267         s->dma_memory_read(s->dma_opaque, s->async_buf, len);
 268     } else {
 269         s->dma_memory_write(s->dma_opaque, s->async_buf, len);
 270     }
 271     s->dma_left -= len;
 272     s->async_buf += len;
 273     s->async_len -= len;
 274     if (to_device)
 275         s->ti_size += len;
 276     else
 277         s->ti_size -= len;
 278     if (s->async_len == 0) {
 279         scsi_req_continue(s->current_req);
 280         /* If there is still data to be read from the device then
 281            complete the DMA operation immediately.  Otherwise defer
 282            until the scsi layer has completed.  */
 283         if (to_device || s->dma_left != 0 || s->ti_size == 0) {
 284             return;
 285         }
 286     }
 287
 288     /* Partially filled a scsi buffer. Complete immediately.  */
 289     esp_dma_done(s);
 290 }
 291
 292 void esp_command_complete(SCSIRequest *req, uint32_t status,
 293                                  size_t resid)
 294 {
 295     ESPState *s = req->hba_private;
 296
 297     trace_esp_command_complete();
 298     if (s->ti_size != 0) {
 299         trace_esp_command_complete_unexpected();
 300     }
 301     s->ti_size = 0;
 302     s->dma_left = 0;
 303     s->async_len = 0;
 304     if (status) {
 305         trace_esp_command_complete_fail();
 306     }
 307     s->status = status;
 308     s->rregs[ESP_RSTAT] = STAT_ST;
 309     esp_dma_done(s);
 310     if (s->current_req) {
 311         scsi_req_unref(s->current_req);
 312         s->current_req = NULL;
 313         s->current_dev = NULL;
 314     }
 315 }
 316
 317 void esp_transfer_data(SCSIRequest *req, uint32_t len)
 318 {
 319     ESPState *s = req->hba_private;
 320
 321     trace_esp_transfer_data(s->dma_left, s->ti_size);
 322     s->async_len = len;
 323     s->async_buf = scsi_req_get_buf(req);
 324     if (s->dma_left) {
 325         esp_do_dma(s);
 326     } else if (s->dma_counter != 0 && s->ti_size <= 0) {
 327         /* If this was the last part of a DMA transfer then the
 328            completion interrupt is deferred to here.  */
 329         esp_dma_done(s);
 330     }
 331 }
 332
 333 static void handle_ti(ESPState *s)
 334 {
 335     uint32_t dmalen, minlen;
 336
 337     if (s->dma && !s->dma_enabled) {
 338         s->dma_cb = handle_ti;
 339         return;
 340     }
 341
 342     dmalen = s->rregs[ESP_TCLO];
 343     dmalen |= s->rregs[ESP_TCMID] << 8;
 344     dmalen |= s->rregs[ESP_TCHI] << 16;
 345     if (dmalen==0) {
 346       dmalen=0x10000;
 347     }
 348     s->dma_counter = dmalen;
 349
 350     if (s->do_cmd)
 351         minlen = (dmalen < 32) ? dmalen : 32;
 352     else if (s->ti_size < 0)
 353         minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
 354     else
 355         minlen = (dmalen < s->ti_size) ? dmalen : s->ti_size;
 356     trace_esp_handle_ti(minlen);
 357     if (s->dma) {
 358         s->dma_left = minlen;
 359         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 360         esp_do_dma(s);
 361     } else 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         return;
 368     }
 369 }
 370
 371 void esp_hard_reset(ESPState *s)
 372 {
 373     memset(s->rregs, 0, ESP_REGS);
 374     memset(s->wregs, 0, ESP_REGS);
 375     s->tchi_written = 0;
 376     s->ti_size = 0;
 377     s->ti_rptr = 0;
 378     s->ti_wptr = 0;
 379     s->dma = 0;
 380     s->do_cmd = 0;
 381     s->dma_cb = NULL;
 382
 383     s->rregs[ESP_CFG1] = 7;
 384 }
 385
 386 static void esp_soft_reset(ESPState *s)
 387 {
 388     qemu_irq_lower(s->irq);
 389     esp_hard_reset(s);
 390 }
 391
 392 static void parent_esp_reset(ESPState *s, int irq, int level)
 393 {
 394     if (level) {
 395         esp_soft_reset(s);
 396     }
 397 }
 398
 399 uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
 400 {
 401     uint32_t old_val;
 402
 403     trace_esp_mem_readb(saddr, s->rregs[saddr]);
 404     switch (saddr) {
 405     case ESP_FIFO:
 406         if (s->ti_size > 0) {
 407             s->ti_size--;
 408             if ((s->rregs[ESP_RSTAT] & STAT_PIO_MASK) == 0) {
 409                 /* Data out.  */
 410                 qemu_log_mask(LOG_UNIMP,
 411                               "esp: PIO data read not implemented\n");
 412                 s->rregs[ESP_FIFO] = 0;
 413             } else {
 414                 s->rregs[ESP_FIFO] = s->ti_buf[s->ti_rptr++];
 415             }
 416             esp_raise_irq(s);
 417         }
 418         if (s->ti_size == 0) {
 419             s->ti_rptr = 0;
 420             s->ti_wptr = 0;
 421         }
 422         break;
 423     case ESP_RINTR:
 424         /* Clear sequence step, interrupt register and all status bits
 425            except TC */
 426         old_val = s->rregs[ESP_RINTR];
 427         s->rregs[ESP_RINTR] = 0;
 428         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 429         s->rregs[ESP_RSEQ] = SEQ_CD;
 430         esp_lower_irq(s);
 431
 432         return old_val;
 433     case ESP_TCHI:
 434         /* Return the unique id if the value has never been written */
 435         if (!s->tchi_written) {
 436             return s->chip_id;
 437         }
 438     default:
 439         break;
 440     }
 441     return s->rregs[saddr];
 442 }
 443
 444 void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val)
 445 {
 446     trace_esp_mem_writeb(saddr, s->wregs[saddr], val);
 447     switch (saddr) {
 448     case ESP_TCHI:
 449         s->tchi_written = true;
 450         /* fall through */
 451     case ESP_TCLO:
 452     case ESP_TCMID:
 453         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 454         break;
 455     case ESP_FIFO:
 456         if (s->do_cmd) {
 457             if (s->cmdlen < TI_BUFSZ) {
 458                 s->cmdbuf[s->cmdlen++] = val & 0xff;
 459             } else {
 460                 trace_esp_error_fifo_overrun();
 461             }
 462         } else if (s->ti_size == TI_BUFSZ - 1) {
 463             trace_esp_error_fifo_overrun();
 464         } else {
 465             s->ti_size++;
 466             s->ti_buf[s->ti_wptr++] = val & 0xff;
 467         }
 468         break;
 469     case ESP_CMD:
 470         s->rregs[saddr] = val;
 471         if (val & CMD_DMA) {
 472             s->dma = 1;
 473             /* Reload DMA counter.  */
 474             s->rregs[ESP_TCLO] = s->wregs[ESP_TCLO];
 475             s->rregs[ESP_TCMID] = s->wregs[ESP_TCMID];
 476             s->rregs[ESP_TCHI] = s->wregs[ESP_TCHI];
 477         } else {
 478             s->dma = 0;
 479         }
 480         switch(val & CMD_CMD) {
 481         case CMD_NOP:
 482             trace_esp_mem_writeb_cmd_nop(val);
 483             break;
 484         case CMD_FLUSH:
 485             trace_esp_mem_writeb_cmd_flush(val);
 486             //s->ti_size = 0;
 487             s->rregs[ESP_RINTR] = INTR_FC;
 488             s->rregs[ESP_RSEQ] = 0;
 489             s->rregs[ESP_RFLAGS] = 0;
 490             break;
 491         case CMD_RESET:
 492             trace_esp_mem_writeb_cmd_reset(val);
 493             esp_soft_reset(s);
 494             break;
 495         case CMD_BUSRESET:
 496             trace_esp_mem_writeb_cmd_bus_reset(val);
 497             s->rregs[ESP_RINTR] = INTR_RST;
 498             if (!(s->wregs[ESP_CFG1] & CFG1_RESREPT)) {
 499                 esp_raise_irq(s);
 500             }
 501             break;
 502         case CMD_TI:
 503             handle_ti(s);
 504             break;
 505         case CMD_ICCS:
 506             trace_esp_mem_writeb_cmd_iccs(val);
 507             write_response(s);
 508             s->rregs[ESP_RINTR] = INTR_FC;
 509             s->rregs[ESP_RSTAT] |= STAT_MI;
 510             break;
 511         case CMD_MSGACC:
 512             trace_esp_mem_writeb_cmd_msgacc(val);
 513             s->rregs[ESP_RINTR] = INTR_DC;
 514             s->rregs[ESP_RSEQ] = 0;
 515             s->rregs[ESP_RFLAGS] = 0;
 516             esp_raise_irq(s);
 517             break;
 518         case CMD_PAD:
 519             trace_esp_mem_writeb_cmd_pad(val);
 520             s->rregs[ESP_RSTAT] = STAT_TC;
 521             s->rregs[ESP_RINTR] = INTR_FC;
 522             s->rregs[ESP_RSEQ] = 0;
 523             break;
 524         case CMD_SATN:
 525             trace_esp_mem_writeb_cmd_satn(val);
 526             break;
 527         case CMD_RSTATN:
 528             trace_esp_mem_writeb_cmd_rstatn(val);
 529             break;
 530         case CMD_SEL:
 531             trace_esp_mem_writeb_cmd_sel(val);
 532             handle_s_without_atn(s);
 533             break;
 534         case CMD_SELATN:
 535             trace_esp_mem_writeb_cmd_selatn(val);
 536             handle_satn(s);
 537             break;
 538         case CMD_SELATNS:
 539             trace_esp_mem_writeb_cmd_selatns(val);
 540             handle_satn_stop(s);
 541             break;
 542         case CMD_ENSEL:
 543             trace_esp_mem_writeb_cmd_ensel(val);
 544             s->rregs[ESP_RINTR] = 0;
 545             break;
 546         case CMD_DISSEL:
 547             trace_esp_mem_writeb_cmd_dissel(val);
 548             s->rregs[ESP_RINTR] = 0;
 549             esp_raise_irq(s);
 550             break;
 551         default:
 552             trace_esp_error_unhandled_command(val);
 553             break;
 554         }
 555         break;
 556     case ESP_WBUSID ... ESP_WSYNO:
 557         break;
 558     case ESP_CFG1:
 559     case ESP_CFG2: case ESP_CFG3:
 560     case ESP_RES3: case ESP_RES4:
 561         s->rregs[saddr] = val;
 562         break;
 563     case ESP_WCCF ... ESP_WTEST:
 564         break;
 565     default:
 566         trace_esp_error_invalid_write(val, saddr);
 567         return;
 568     }
 569     s->wregs[saddr] = val;
 570 }
 571
 572 static bool esp_mem_accepts(void *opaque, hwaddr addr,
 573                             unsigned size, bool is_write)
 574 {
 575     return (size == 1) || (is_write && size == 4);
 576 }
 577
 578 const VMStateDescription vmstate_esp = {
 579     .name ="esp",
 580     .version_id = 3,
 581     .minimum_version_id = 3,
 582     .fields = (VMStateField[]) {
 583         VMSTATE_BUFFER(rregs, ESPState),
 584         VMSTATE_BUFFER(wregs, ESPState),
 585         VMSTATE_INT32(ti_size, ESPState),
 586         VMSTATE_UINT32(ti_rptr, ESPState),
 587         VMSTATE_UINT32(ti_wptr, ESPState),
 588         VMSTATE_BUFFER(ti_buf, ESPState),
 589         VMSTATE_UINT32(status, ESPState),
 590         VMSTATE_UINT32(dma, ESPState),
 591         VMSTATE_BUFFER(cmdbuf, ESPState),
 592         VMSTATE_UINT32(cmdlen, ESPState),
 593         VMSTATE_UINT32(do_cmd, ESPState),
 594         VMSTATE_UINT32(dma_left, ESPState),
 595         VMSTATE_END_OF_LIST()
 596     }
 597 };
 598
 599 #define TYPE_ESP "esp"
 600 #define ESP(obj) OBJECT_CHECK(SysBusESPState, (obj), TYPE_ESP)
 601
 602 typedef struct {
 603     /*< private >*/
 604     SysBusDevice parent_obj;
 605     /*< public >*/
 606
 607     MemoryRegion iomem;
 608     uint32_t it_shift;
 609     ESPState esp;
 610 } SysBusESPState;
 611
 612 static void sysbus_esp_mem_write(void *opaque, hwaddr addr,
 613                                  uint64_t val, unsigned int size)
 614 {
 615     SysBusESPState *sysbus = opaque;
 616     uint32_t saddr;
 617
 618     saddr = addr >> sysbus->it_shift;
 619     esp_reg_write(&sysbus->esp, saddr, val);
 620 }
 621
 622 static uint64_t sysbus_esp_mem_read(void *opaque, hwaddr addr,
 623                                     unsigned int size)
 624 {
 625     SysBusESPState *sysbus = opaque;
 626     uint32_t saddr;
 627
 628     saddr = addr >> sysbus->it_shift;
 629     return esp_reg_read(&sysbus->esp, saddr);
 630 }
 631
 632 static const MemoryRegionOps sysbus_esp_mem_ops = {
 633     .read = sysbus_esp_mem_read,
 634     .write = sysbus_esp_mem_write,
 635     .endianness = DEVICE_NATIVE_ENDIAN,
 636     .valid.accepts = esp_mem_accepts,
 637 };
 638
 639 void esp_init(hwaddr espaddr, int it_shift,
 640               ESPDMAMemoryReadWriteFunc dma_memory_read,
 641               ESPDMAMemoryReadWriteFunc dma_memory_write,
 642               void *dma_opaque, qemu_irq irq, qemu_irq *reset,
 643               qemu_irq *dma_enable)
 644 {
 645     DeviceState *dev;
 646     SysBusDevice *s;
 647     SysBusESPState *sysbus;
 648     ESPState *esp;
 649
 650     dev = qdev_create(NULL, TYPE_ESP);
 651     sysbus = ESP(dev);
 652     esp = &sysbus->esp;
 653     esp->dma_memory_read = dma_memory_read;
 654     esp->dma_memory_write = dma_memory_write;
 655     esp->dma_opaque = dma_opaque;
 656     sysbus->it_shift = it_shift;
 657     /* XXX for now until rc4030 has been changed to use DMA enable signal */
 658     esp->dma_enabled = 1;
 659     qdev_init_nofail(dev);
 660     s = SYS_BUS_DEVICE(dev);
 661     sysbus_connect_irq(s, 0, irq);
 662     sysbus_mmio_map(s, 0, espaddr);
 663     *reset = qdev_get_gpio_in(dev, 0);
 664     *dma_enable = qdev_get_gpio_in(dev, 1);
 665 }
 666
 667 static const struct SCSIBusInfo esp_scsi_info = {
 668     .tcq = false,
 669     .max_target = ESP_MAX_DEVS,
 670     .max_lun = 7,
 671
 672     .transfer_data = esp_transfer_data,
 673     .complete = esp_command_complete,
 674     .cancel = esp_request_cancelled
 675 };
 676
 677 static void sysbus_esp_gpio_demux(void *opaque, int irq, int level)
 678 {
 679     SysBusESPState *sysbus = ESP(opaque);
 680     ESPState *s = &sysbus->esp;
 681
 682     switch (irq) {
 683     case 0:
 684         parent_esp_reset(s, irq, level);
 685         break;
 686     case 1:
 687         esp_dma_enable(opaque, irq, level);
 688         break;
 689     }
 690 }
 691
 692 static void sysbus_esp_realize(DeviceState *dev, Error **errp)
 693 {
 694     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 695     SysBusESPState *sysbus = ESP(dev);
 696     ESPState *s = &sysbus->esp;
 697     Error *err = NULL;
 698
 699     sysbus_init_irq(sbd, &s->irq);
 700     assert(sysbus->it_shift != -1);
 701
 702     s->chip_id = TCHI_FAS100A;
 703     memory_region_init_io(&sysbus->iomem, OBJECT(sysbus), &sysbus_esp_mem_ops,
 704                           sysbus, "esp", ESP_REGS << sysbus->it_shift);
 705     sysbus_init_mmio(sbd, &sysbus->iomem);
 706
 707     qdev_init_gpio_in(dev, sysbus_esp_gpio_demux, 2);
 708
 709     scsi_bus_new(&s->bus, sizeof(s->bus), dev, &esp_scsi_info, NULL);
 710     scsi_bus_legacy_handle_cmdline(&s->bus, &err);
 711     if (err != NULL) {
 712         error_propagate(errp, err);
 713         return;
 714     }
 715 }
 716
 717 static void sysbus_esp_hard_reset(DeviceState *dev)
 718 {
 719     SysBusESPState *sysbus = ESP(dev);
 720     esp_hard_reset(&sysbus->esp);
 721 }
 722
 723 static const VMStateDescription vmstate_sysbus_esp_scsi = {
 724     .name = "sysbusespscsi",
 725     .version_id = 0,
 726     .minimum_version_id = 0,
 727     .fields = (VMStateField[]) {
 728         VMSTATE_STRUCT(esp, SysBusESPState, 0, vmstate_esp, ESPState),
 729         VMSTATE_END_OF_LIST()
 730     }
 731 };
 732
 733 static void sysbus_esp_class_init(ObjectClass *klass, void *data)
 734 {
 735     DeviceClass *dc = DEVICE_CLASS(klass);
 736
 737     dc->realize = sysbus_esp_realize;
 738     dc->reset = sysbus_esp_hard_reset;
 739     dc->vmsd = &vmstate_sysbus_esp_scsi;
 740     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 741 }
 742
 743 static const TypeInfo sysbus_esp_info = {
 744     .name          = TYPE_ESP,
 745     .parent        = TYPE_SYS_BUS_DEVICE,
 746     .instance_size = sizeof(SysBusESPState),
 747     .class_init    = sysbus_esp_class_init,
 748 };
 749
 750 static void esp_register_types(void)
 751 {
 752     type_register_static(&sysbus_esp_info);
 753 }
 754
 755 type_init(esp_register_types)