hw/esp.c

   1 /*
   2  * QEMU ESP/NCR53C9x emulation
   3  *
   4  * Copyright (c) 2005-2006 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "sysbus.h"
  26 #include "scsi-disk.h"
  27 #include "scsi.h"
  28
  29 /* debug ESP card */
  30 //#define DEBUG_ESP
  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 #ifdef DEBUG_ESP
  41 #define DPRINTF(fmt, ...)                                       \
  42     do { printf("ESP: " fmt , ## __VA_ARGS__); } while (0)
  43 #else
  44 #define DPRINTF(fmt, ...) do {} while (0)
  45 #endif
  46
  47 #define ESP_ERROR(fmt, ...)                                             \
  48     do { printf("ESP ERROR: %s: " fmt, __func__ , ## __VA_ARGS__); } while (0)
  49
  50 #define ESP_REGS 16
  51 #define TI_BUFSZ 16
  52
  53 typedef struct ESPState ESPState;
  54
  55 struct ESPState {
  56     SysBusDevice busdev;
  57     uint32_t it_shift;
  58     qemu_irq irq;
  59     uint8_t rregs[ESP_REGS];
  60     uint8_t wregs[ESP_REGS];
  61     int32_t ti_size;
  62     uint32_t ti_rptr, ti_wptr;
  63     uint8_t ti_buf[TI_BUFSZ];
  64     uint32_t sense;
  65     uint32_t dma;
  66     SCSIDevice *scsi_dev[ESP_MAX_DEVS];
  67     SCSIDevice *current_dev;
  68     uint8_t cmdbuf[TI_BUFSZ];
  69     uint32_t cmdlen;
  70     uint32_t do_cmd;
  71
  72     /* The amount of data left in the current DMA transfer.  */
  73     uint32_t dma_left;
  74     /* The size of the current DMA transfer.  Zero if no transfer is in
  75        progress.  */
  76     uint32_t dma_counter;
  77     uint8_t *async_buf;
  78     uint32_t async_len;
  79
  80     espdma_memory_read_write dma_memory_read;
  81     espdma_memory_read_write dma_memory_write;
  82     void *dma_opaque;
  83 };
  84
  85 #define ESP_TCLO   0x0
  86 #define ESP_TCMID  0x1
  87 #define ESP_FIFO   0x2
  88 #define ESP_CMD    0x3
  89 #define ESP_RSTAT  0x4
  90 #define ESP_WBUSID 0x4
  91 #define ESP_RINTR  0x5
  92 #define ESP_WSEL   0x5
  93 #define ESP_RSEQ   0x6
  94 #define ESP_WSYNTP 0x6
  95 #define ESP_RFLAGS 0x7
  96 #define ESP_WSYNO  0x7
  97 #define ESP_CFG1   0x8
  98 #define ESP_RRES1  0x9
  99 #define ESP_WCCF   0x9
 100 #define ESP_RRES2  0xa
 101 #define ESP_WTEST  0xa
 102 #define ESP_CFG2   0xb
 103 #define ESP_CFG3   0xc
 104 #define ESP_RES3   0xd
 105 #define ESP_TCHI   0xe
 106 #define ESP_RES4   0xf
 107
 108 #define CMD_DMA 0x80
 109 #define CMD_CMD 0x7f
 110
 111 #define CMD_NOP      0x00
 112 #define CMD_FLUSH    0x01
 113 #define CMD_RESET    0x02
 114 #define CMD_BUSRESET 0x03
 115 #define CMD_TI       0x10
 116 #define CMD_ICCS     0x11
 117 #define CMD_MSGACC   0x12
 118 #define CMD_PAD      0x18
 119 #define CMD_SATN     0x1a
 120 #define CMD_SEL      0x41
 121 #define CMD_SELATN   0x42
 122 #define CMD_SELATNS  0x43
 123 #define CMD_ENSEL    0x44
 124
 125 #define STAT_DO 0x00
 126 #define STAT_DI 0x01
 127 #define STAT_CD 0x02
 128 #define STAT_ST 0x03
 129 #define STAT_MO 0x06
 130 #define STAT_MI 0x07
 131 #define STAT_PIO_MASK 0x06
 132
 133 #define STAT_TC 0x10
 134 #define STAT_PE 0x20
 135 #define STAT_GE 0x40
 136 #define STAT_INT 0x80
 137
 138 #define BUSID_DID 0x07
 139
 140 #define INTR_FC 0x08
 141 #define INTR_BS 0x10
 142 #define INTR_DC 0x20
 143 #define INTR_RST 0x80
 144
 145 #define SEQ_0 0x0
 146 #define SEQ_CD 0x4
 147
 148 #define CFG1_RESREPT 0x40
 149
 150 #define TCHI_FAS100A 0x4
 151
 152 static void esp_raise_irq(ESPState *s)
 153 {
 154     if (!(s->rregs[ESP_RSTAT] & STAT_INT)) {
 155         s->rregs[ESP_RSTAT] |= STAT_INT;
 156         qemu_irq_raise(s->irq);
 157     }
 158 }
 159
 160 static void esp_lower_irq(ESPState *s)
 161 {
 162     if (s->rregs[ESP_RSTAT] & STAT_INT) {
 163         s->rregs[ESP_RSTAT] &= ~STAT_INT;
 164         qemu_irq_lower(s->irq);
 165     }
 166 }
 167
 168 static uint32_t get_cmd(ESPState *s, uint8_t *buf)
 169 {
 170     uint32_t dmalen;
 171     int target;
 172
 173     target = s->wregs[ESP_WBUSID] & BUSID_DID;
 174     if (s->dma) {
 175         dmalen = s->rregs[ESP_TCLO] | (s->rregs[ESP_TCMID] << 8);
 176         s->dma_memory_read(s->dma_opaque, buf, dmalen);
 177     } else {
 178         dmalen = s->ti_size;
 179         memcpy(buf, s->ti_buf, dmalen);
 180         buf[0] = 0;
 181     }
 182     DPRINTF("get_cmd: len %d target %d\n", dmalen, target);
 183
 184     s->ti_size = 0;
 185     s->ti_rptr = 0;
 186     s->ti_wptr = 0;
 187
 188     if (s->current_dev) {
 189         /* Started a new command before the old one finished.  Cancel it.  */
 190         s->current_dev->cancel_io(s->current_dev, 0);
 191         s->async_len = 0;
 192     }
 193
 194     if (target >= ESP_MAX_DEVS || !s->scsi_dev[target]) {
 195         // No such drive
 196         s->rregs[ESP_RSTAT] = 0;
 197         s->rregs[ESP_RINTR] = INTR_DC;
 198         s->rregs[ESP_RSEQ] = SEQ_0;
 199         esp_raise_irq(s);
 200         return 0;
 201     }
 202     s->current_dev = s->scsi_dev[target];
 203     return dmalen;
 204 }
 205
 206 static void do_cmd(ESPState *s, uint8_t *buf)
 207 {
 208     int32_t datalen;
 209     int lun;
 210
 211     DPRINTF("do_cmd: busid 0x%x\n", buf[0]);
 212     lun = buf[0] & 7;
 213     datalen = s->current_dev->send_command(s->current_dev, 0, &buf[1], lun);
 214     s->ti_size = datalen;
 215     if (datalen != 0) {
 216         s->rregs[ESP_RSTAT] = STAT_TC;
 217         s->dma_left = 0;
 218         s->dma_counter = 0;
 219         if (datalen > 0) {
 220             s->rregs[ESP_RSTAT] |= STAT_DI;
 221             s->current_dev->read_data(s->current_dev, 0);
 222         } else {
 223             s->rregs[ESP_RSTAT] |= STAT_DO;
 224             s->current_dev->write_data(s->current_dev, 0);
 225         }
 226     }
 227     s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 228     s->rregs[ESP_RSEQ] = SEQ_CD;
 229     esp_raise_irq(s);
 230 }
 231
 232 static void handle_satn(ESPState *s)
 233 {
 234     uint8_t buf[32];
 235     int len;
 236
 237     len = get_cmd(s, buf);
 238     if (len)
 239         do_cmd(s, buf);
 240 }
 241
 242 static void handle_satn_stop(ESPState *s)
 243 {
 244     s->cmdlen = get_cmd(s, s->cmdbuf);
 245     if (s->cmdlen) {
 246         DPRINTF("Set ATN & Stop: cmdlen %d\n", s->cmdlen);
 247         s->do_cmd = 1;
 248         s->rregs[ESP_RSTAT] = STAT_TC | STAT_CD;
 249         s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 250         s->rregs[ESP_RSEQ] = SEQ_CD;
 251         esp_raise_irq(s);
 252     }
 253 }
 254
 255 static void write_response(ESPState *s)
 256 {
 257     DPRINTF("Transfer status (sense=%d)\n", s->sense);
 258     s->ti_buf[0] = s->sense;
 259     s->ti_buf[1] = 0;
 260     if (s->dma) {
 261         s->dma_memory_write(s->dma_opaque, s->ti_buf, 2);
 262         s->rregs[ESP_RSTAT] = STAT_TC | STAT_ST;
 263         s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 264         s->rregs[ESP_RSEQ] = SEQ_CD;
 265     } else {
 266         s->ti_size = 2;
 267         s->ti_rptr = 0;
 268         s->ti_wptr = 0;
 269         s->rregs[ESP_RFLAGS] = 2;
 270     }
 271     esp_raise_irq(s);
 272 }
 273
 274 static void esp_dma_done(ESPState *s)
 275 {
 276     s->rregs[ESP_RSTAT] |= STAT_TC;
 277     s->rregs[ESP_RINTR] = INTR_BS;
 278     s->rregs[ESP_RSEQ] = 0;
 279     s->rregs[ESP_RFLAGS] = 0;
 280     s->rregs[ESP_TCLO] = 0;
 281     s->rregs[ESP_TCMID] = 0;
 282     esp_raise_irq(s);
 283 }
 284
 285 static void esp_do_dma(ESPState *s)
 286 {
 287     uint32_t len;
 288     int to_device;
 289
 290     to_device = (s->ti_size < 0);
 291     len = s->dma_left;
 292     if (s->do_cmd) {
 293         DPRINTF("command len %d + %d\n", s->cmdlen, len);
 294         s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
 295         s->ti_size = 0;
 296         s->cmdlen = 0;
 297         s->do_cmd = 0;
 298         do_cmd(s, s->cmdbuf);
 299         return;
 300     }
 301     if (s->async_len == 0) {
 302         /* Defer until data is available.  */
 303         return;
 304     }
 305     if (len > s->async_len) {
 306         len = s->async_len;
 307     }
 308     if (to_device) {
 309         s->dma_memory_read(s->dma_opaque, s->async_buf, len);
 310     } else {
 311         s->dma_memory_write(s->dma_opaque, s->async_buf, len);
 312     }
 313     s->dma_left -= len;
 314     s->async_buf += len;
 315     s->async_len -= len;
 316     if (to_device)
 317         s->ti_size += len;
 318     else
 319         s->ti_size -= len;
 320     if (s->async_len == 0) {
 321         if (to_device) {
 322             // ti_size is negative
 323             s->current_dev->write_data(s->current_dev, 0);
 324         } else {
 325             s->current_dev->read_data(s->current_dev, 0);
 326             /* If there is still data to be read from the device then
 327                complete the DMA operation immediately.  Otherwise defer
 328                until the scsi layer has completed.  */
 329             if (s->dma_left == 0 && s->ti_size > 0) {
 330                 esp_dma_done(s);
 331             }
 332         }
 333     } else {
 334         /* Partially filled a scsi buffer. Complete immediately.  */
 335         esp_dma_done(s);
 336     }
 337 }
 338
 339 static void esp_command_complete(void *opaque, int reason, uint32_t tag,
 340                                  uint32_t arg)
 341 {
 342     ESPState *s = (ESPState *)opaque;
 343
 344     if (reason == SCSI_REASON_DONE) {
 345         DPRINTF("SCSI Command complete\n");
 346         if (s->ti_size != 0)
 347             DPRINTF("SCSI command completed unexpectedly\n");
 348         s->ti_size = 0;
 349         s->dma_left = 0;
 350         s->async_len = 0;
 351         if (arg)
 352             DPRINTF("Command failed\n");
 353         s->sense = arg;
 354         s->rregs[ESP_RSTAT] = STAT_ST;
 355         esp_dma_done(s);
 356         s->current_dev = NULL;
 357     } else {
 358         DPRINTF("transfer %d/%d\n", s->dma_left, s->ti_size);
 359         s->async_len = arg;
 360         s->async_buf = s->current_dev->get_buf(s->current_dev, 0);
 361         if (s->dma_left) {
 362             esp_do_dma(s);
 363         } else if (s->dma_counter != 0 && s->ti_size <= 0) {
 364             /* If this was the last part of a DMA transfer then the
 365                completion interrupt is deferred to here.  */
 366             esp_dma_done(s);
 367         }
 368     }
 369 }
 370
 371 static void handle_ti(ESPState *s)
 372 {
 373     uint32_t dmalen, minlen;
 374
 375     dmalen = s->rregs[ESP_TCLO] | (s->rregs[ESP_TCMID] << 8);
 376     if (dmalen==0) {
 377       dmalen=0x10000;
 378     }
 379     s->dma_counter = dmalen;
 380
 381     if (s->do_cmd)
 382         minlen = (dmalen < 32) ? dmalen : 32;
 383     else if (s->ti_size < 0)
 384         minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
 385     else
 386         minlen = (dmalen < s->ti_size) ? dmalen : s->ti_size;
 387     DPRINTF("Transfer Information len %d\n", minlen);
 388     if (s->dma) {
 389         s->dma_left = minlen;
 390         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 391         esp_do_dma(s);
 392     } else if (s->do_cmd) {
 393         DPRINTF("command len %d\n", s->cmdlen);
 394         s->ti_size = 0;
 395         s->cmdlen = 0;
 396         s->do_cmd = 0;
 397         do_cmd(s, s->cmdbuf);
 398         return;
 399     }
 400 }
 401
 402 static void esp_reset(void *opaque)
 403 {
 404     ESPState *s = opaque;
 405
 406     memset(s->rregs, 0, ESP_REGS);
 407     memset(s->wregs, 0, ESP_REGS);
 408     s->rregs[ESP_TCHI] = TCHI_FAS100A; // Indicate fas100a
 409     s->ti_size = 0;
 410     s->ti_rptr = 0;
 411     s->ti_wptr = 0;
 412     s->dma = 0;
 413     s->do_cmd = 0;
 414
 415     s->rregs[ESP_CFG1] = 7;
 416 }
 417
 418 static void parent_esp_reset(void *opaque, int irq, int level)
 419 {
 420     if (level)
 421         esp_reset(opaque);
 422 }
 423
 424 static uint32_t esp_mem_readb(void *opaque, target_phys_addr_t addr)
 425 {
 426     ESPState *s = opaque;
 427     uint32_t saddr, old_val;
 428
 429     saddr = addr >> s->it_shift;
 430     DPRINTF("read reg[%d]: 0x%2.2x\n", saddr, s->rregs[saddr]);
 431     switch (saddr) {
 432     case ESP_FIFO:
 433         if (s->ti_size > 0) {
 434             s->ti_size--;
 435             if ((s->rregs[ESP_RSTAT] & STAT_PIO_MASK) == 0) {
 436                 /* Data out.  */
 437                 ESP_ERROR("PIO data read not implemented\n");
 438                 s->rregs[ESP_FIFO] = 0;
 439             } else {
 440                 s->rregs[ESP_FIFO] = s->ti_buf[s->ti_rptr++];
 441             }
 442             esp_raise_irq(s);
 443         }
 444         if (s->ti_size == 0) {
 445             s->ti_rptr = 0;
 446             s->ti_wptr = 0;
 447         }
 448         break;
 449     case ESP_RINTR:
 450         /* Clear sequence step, interrupt register and all status bits
 451            except TC */
 452         old_val = s->rregs[ESP_RINTR];
 453         s->rregs[ESP_RINTR] = 0;
 454         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 455         s->rregs[ESP_RSEQ] = SEQ_CD;
 456         esp_lower_irq(s);
 457
 458         return old_val;
 459     default:
 460         break;
 461     }
 462     return s->rregs[saddr];
 463 }
 464
 465 static void esp_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
 466 {
 467     ESPState *s = opaque;
 468     uint32_t saddr;
 469
 470     saddr = addr >> s->it_shift;
 471     DPRINTF("write reg[%d]: 0x%2.2x -> 0x%2.2x\n", saddr, s->wregs[saddr],
 472             val);
 473     switch (saddr) {
 474     case ESP_TCLO:
 475     case ESP_TCMID:
 476         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 477         break;
 478     case ESP_FIFO:
 479         if (s->do_cmd) {
 480             s->cmdbuf[s->cmdlen++] = val & 0xff;
 481         } else if (s->ti_size == TI_BUFSZ - 1) {
 482             ESP_ERROR("fifo overrun\n");
 483         } else {
 484             s->ti_size++;
 485             s->ti_buf[s->ti_wptr++] = val & 0xff;
 486         }
 487         break;
 488     case ESP_CMD:
 489         s->rregs[saddr] = val;
 490         if (val & CMD_DMA) {
 491             s->dma = 1;
 492             /* Reload DMA counter.  */
 493             s->rregs[ESP_TCLO] = s->wregs[ESP_TCLO];
 494             s->rregs[ESP_TCMID] = s->wregs[ESP_TCMID];
 495         } else {
 496             s->dma = 0;
 497         }
 498         switch(val & CMD_CMD) {
 499         case CMD_NOP:
 500             DPRINTF("NOP (%2.2x)\n", val);
 501             break;
 502         case CMD_FLUSH:
 503             DPRINTF("Flush FIFO (%2.2x)\n", val);
 504             //s->ti_size = 0;
 505             s->rregs[ESP_RINTR] = INTR_FC;
 506             s->rregs[ESP_RSEQ] = 0;
 507             s->rregs[ESP_RFLAGS] = 0;
 508             break;
 509         case CMD_RESET:
 510             DPRINTF("Chip reset (%2.2x)\n", val);
 511             esp_reset(s);
 512             break;
 513         case CMD_BUSRESET:
 514             DPRINTF("Bus reset (%2.2x)\n", val);
 515             s->rregs[ESP_RINTR] = INTR_RST;
 516             if (!(s->wregs[ESP_CFG1] & CFG1_RESREPT)) {
 517                 esp_raise_irq(s);
 518             }
 519             break;
 520         case CMD_TI:
 521             handle_ti(s);
 522             break;
 523         case CMD_ICCS:
 524             DPRINTF("Initiator Command Complete Sequence (%2.2x)\n", val);
 525             write_response(s);
 526             s->rregs[ESP_RINTR] = INTR_FC;
 527             s->rregs[ESP_RSTAT] |= STAT_MI;
 528             break;
 529         case CMD_MSGACC:
 530             DPRINTF("Message Accepted (%2.2x)\n", val);
 531             write_response(s);
 532             s->rregs[ESP_RINTR] = INTR_DC;
 533             s->rregs[ESP_RSEQ] = 0;
 534             break;
 535         case CMD_PAD:
 536             DPRINTF("Transfer padding (%2.2x)\n", val);
 537             s->rregs[ESP_RSTAT] = STAT_TC;
 538             s->rregs[ESP_RINTR] = INTR_FC;
 539             s->rregs[ESP_RSEQ] = 0;
 540             break;
 541         case CMD_SATN:
 542             DPRINTF("Set ATN (%2.2x)\n", val);
 543             break;
 544         case CMD_SEL:
 545             DPRINTF("Select without ATN (%2.2x)\n", val);
 546             handle_satn(s);
 547             break;
 548         case CMD_SELATN:
 549             DPRINTF("Select with ATN (%2.2x)\n", val);
 550             handle_satn(s);
 551             break;
 552         case CMD_SELATNS:
 553             DPRINTF("Select with ATN & stop (%2.2x)\n", val);
 554             handle_satn_stop(s);
 555             break;
 556         case CMD_ENSEL:
 557             DPRINTF("Enable selection (%2.2x)\n", val);
 558             s->rregs[ESP_RINTR] = 0;
 559             break;
 560         default:
 561             ESP_ERROR("Unhandled ESP command (%2.2x)\n", val);
 562             break;
 563         }
 564         break;
 565     case ESP_WBUSID ... ESP_WSYNO:
 566         break;
 567     case ESP_CFG1:
 568         s->rregs[saddr] = val;
 569         break;
 570     case ESP_WCCF ... ESP_WTEST:
 571         break;
 572     case ESP_CFG2 ... ESP_RES4:
 573         s->rregs[saddr] = val;
 574         break;
 575     default:
 576         ESP_ERROR("invalid write of 0x%02x at [0x%x]\n", val, saddr);
 577         return;
 578     }
 579     s->wregs[saddr] = val;
 580 }
 581
 582 static CPUReadMemoryFunc *esp_mem_read[3] = {
 583     esp_mem_readb,
 584     NULL,
 585     NULL,
 586 };
 587
 588 static CPUWriteMemoryFunc *esp_mem_write[3] = {
 589     esp_mem_writeb,
 590     NULL,
 591     esp_mem_writeb,
 592 };
 593
 594 static void esp_save(QEMUFile *f, void *opaque)
 595 {
 596     ESPState *s = opaque;
 597
 598     qemu_put_buffer(f, s->rregs, ESP_REGS);
 599     qemu_put_buffer(f, s->wregs, ESP_REGS);
 600     qemu_put_sbe32s(f, &s->ti_size);
 601     qemu_put_be32s(f, &s->ti_rptr);
 602     qemu_put_be32s(f, &s->ti_wptr);
 603     qemu_put_buffer(f, s->ti_buf, TI_BUFSZ);
 604     qemu_put_be32s(f, &s->sense);
 605     qemu_put_be32s(f, &s->dma);
 606     qemu_put_buffer(f, s->cmdbuf, TI_BUFSZ);
 607     qemu_put_be32s(f, &s->cmdlen);
 608     qemu_put_be32s(f, &s->do_cmd);
 609     qemu_put_be32s(f, &s->dma_left);
 610     // There should be no transfers in progress, so dma_counter is not saved
 611 }
 612
 613 static int esp_load(QEMUFile *f, void *opaque, int version_id)
 614 {
 615     ESPState *s = opaque;
 616
 617     if (version_id != 3)
 618         return -EINVAL; // Cannot emulate 2
 619
 620     qemu_get_buffer(f, s->rregs, ESP_REGS);
 621     qemu_get_buffer(f, s->wregs, ESP_REGS);
 622     qemu_get_sbe32s(f, &s->ti_size);
 623     qemu_get_be32s(f, &s->ti_rptr);
 624     qemu_get_be32s(f, &s->ti_wptr);
 625     qemu_get_buffer(f, s->ti_buf, TI_BUFSZ);
 626     qemu_get_be32s(f, &s->sense);
 627     qemu_get_be32s(f, &s->dma);
 628     qemu_get_buffer(f, s->cmdbuf, TI_BUFSZ);
 629     qemu_get_be32s(f, &s->cmdlen);
 630     qemu_get_be32s(f, &s->do_cmd);
 631     qemu_get_be32s(f, &s->dma_left);
 632
 633     return 0;
 634 }
 635
 636 static void esp_scsi_attach(DeviceState *host, BlockDriverState *bd, int id)
 637 {
 638     ESPState *s = FROM_SYSBUS(ESPState, sysbus_from_qdev(host));
 639
 640     if (id < 0) {
 641         for (id = 0; id < ESP_MAX_DEVS; id++) {
 642             if (id == (s->rregs[ESP_CFG1] & 0x7))
 643                 continue;
 644             if (s->scsi_dev[id] == NULL)
 645                 break;
 646         }
 647     }
 648     if (id >= ESP_MAX_DEVS) {
 649         DPRINTF("Bad Device ID %d\n", id);
 650         return;
 651     }
 652     if (s->scsi_dev[id]) {
 653         DPRINTF("Destroying device %d\n", id);
 654         s->scsi_dev[id]->destroy(s->scsi_dev[id]);
 655     }
 656     DPRINTF("Attaching block device %d\n", id);
 657     /* Command queueing is not implemented.  */
 658     s->scsi_dev[id] = scsi_generic_init(bd, 0, esp_command_complete, s);
 659     if (s->scsi_dev[id] == NULL)
 660         s->scsi_dev[id] = scsi_disk_init(bd, 0, esp_command_complete, s);
 661 }
 662
 663 void esp_init(target_phys_addr_t espaddr, int it_shift,
 664               espdma_memory_read_write dma_memory_read,
 665               espdma_memory_read_write dma_memory_write,
 666               void *dma_opaque, qemu_irq irq, qemu_irq *reset)
 667 {
 668     DeviceState *dev;
 669     SysBusDevice *s;
 670     ESPState *esp;
 671
 672     dev = qdev_create(NULL, "esp");
 673     esp = DO_UPCAST(ESPState, busdev.qdev, dev);
 674     esp->dma_memory_read = dma_memory_read;
 675     esp->dma_memory_write = dma_memory_write;
 676     esp->dma_opaque = dma_opaque;
 677     esp->it_shift = it_shift;
 678     qdev_init(dev);
 679     s = sysbus_from_qdev(dev);
 680     sysbus_connect_irq(s, 0, irq);
 681     sysbus_mmio_map(s, 0, espaddr);
 682     *reset = qdev_get_gpio_in(dev, 0);
 683 }
 684
 685 static void esp_init1(SysBusDevice *dev)
 686 {
 687     ESPState *s = FROM_SYSBUS(ESPState, dev);
 688     int esp_io_memory;
 689
 690     sysbus_init_irq(dev, &s->irq);
 691     assert(s->it_shift != -1);
 692
 693     esp_io_memory = cpu_register_io_memory(esp_mem_read, esp_mem_write, s);
 694     sysbus_init_mmio(dev, ESP_REGS << s->it_shift, esp_io_memory);
 695
 696     esp_reset(s);
 697
 698     register_savevm("esp", -1, 3, esp_save, esp_load, s);
 699     qemu_register_reset(esp_reset, s);
 700
 701     qdev_init_gpio_in(&dev->qdev, parent_esp_reset, 1);
 702
 703     scsi_bus_new(&dev->qdev, esp_scsi_attach);
 704 }
 705
 706 static void esp_register_devices(void)
 707 {
 708     sysbus_register_dev("esp", sizeof(ESPState), esp_init1);
 709 }
 710
 711 device_init(esp_register_devices)