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.h"
  27 #include "esp.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 status;
  65     uint32_t dma;
  66     SCSIBus bus;
  67     SCSIDevice *current_dev;
  68     SCSIRequest *current_req;
  69     uint8_t cmdbuf[TI_BUFSZ];
  70     uint32_t cmdlen;
  71     uint32_t do_cmd;
  72
  73     /* The amount of data left in the current DMA transfer.  */
  74     uint32_t dma_left;
  75     /* The size of the current DMA transfer.  Zero if no transfer is in
  76        progress.  */
  77     uint32_t dma_counter;
  78     uint8_t *async_buf;
  79     uint32_t async_len;
  80
  81     ESPDMAMemoryReadWriteFunc dma_memory_read;
  82     ESPDMAMemoryReadWriteFunc dma_memory_write;
  83     void *dma_opaque;
  84     int dma_enabled;
  85     void (*dma_cb)(ESPState *s);
  86 };
  87
  88 #define ESP_TCLO   0x0
  89 #define ESP_TCMID  0x1
  90 #define ESP_FIFO   0x2
  91 #define ESP_CMD    0x3
  92 #define ESP_RSTAT  0x4
  93 #define ESP_WBUSID 0x4
  94 #define ESP_RINTR  0x5
  95 #define ESP_WSEL   0x5
  96 #define ESP_RSEQ   0x6
  97 #define ESP_WSYNTP 0x6
  98 #define ESP_RFLAGS 0x7
  99 #define ESP_WSYNO  0x7
 100 #define ESP_CFG1   0x8
 101 #define ESP_RRES1  0x9
 102 #define ESP_WCCF   0x9
 103 #define ESP_RRES2  0xa
 104 #define ESP_WTEST  0xa
 105 #define ESP_CFG2   0xb
 106 #define ESP_CFG3   0xc
 107 #define ESP_RES3   0xd
 108 #define ESP_TCHI   0xe
 109 #define ESP_RES4   0xf
 110
 111 #define CMD_DMA 0x80
 112 #define CMD_CMD 0x7f
 113
 114 #define CMD_NOP      0x00
 115 #define CMD_FLUSH    0x01
 116 #define CMD_RESET    0x02
 117 #define CMD_BUSRESET 0x03
 118 #define CMD_TI       0x10
 119 #define CMD_ICCS     0x11
 120 #define CMD_MSGACC   0x12
 121 #define CMD_PAD      0x18
 122 #define CMD_SATN     0x1a
 123 #define CMD_SEL      0x41
 124 #define CMD_SELATN   0x42
 125 #define CMD_SELATNS  0x43
 126 #define CMD_ENSEL    0x44
 127
 128 #define STAT_DO 0x00
 129 #define STAT_DI 0x01
 130 #define STAT_CD 0x02
 131 #define STAT_ST 0x03
 132 #define STAT_MO 0x06
 133 #define STAT_MI 0x07
 134 #define STAT_PIO_MASK 0x06
 135
 136 #define STAT_TC 0x10
 137 #define STAT_PE 0x20
 138 #define STAT_GE 0x40
 139 #define STAT_INT 0x80
 140
 141 #define BUSID_DID 0x07
 142
 143 #define INTR_FC 0x08
 144 #define INTR_BS 0x10
 145 #define INTR_DC 0x20
 146 #define INTR_RST 0x80
 147
 148 #define SEQ_0 0x0
 149 #define SEQ_CD 0x4
 150
 151 #define CFG1_RESREPT 0x40
 152
 153 #define TCHI_FAS100A 0x4
 154
 155 static void esp_raise_irq(ESPState *s)
 156 {
 157     if (!(s->rregs[ESP_RSTAT] & STAT_INT)) {
 158         s->rregs[ESP_RSTAT] |= STAT_INT;
 159         qemu_irq_raise(s->irq);
 160         DPRINTF("Raise IRQ\n");
 161     }
 162 }
 163
 164 static void esp_lower_irq(ESPState *s)
 165 {
 166     if (s->rregs[ESP_RSTAT] & STAT_INT) {
 167         s->rregs[ESP_RSTAT] &= ~STAT_INT;
 168         qemu_irq_lower(s->irq);
 169         DPRINTF("Lower IRQ\n");
 170     }
 171 }
 172
 173 static void esp_dma_enable(void *opaque, int irq, int level)
 174 {
 175     DeviceState *d = opaque;
 176     ESPState *s = container_of(d, ESPState, busdev.qdev);
 177
 178     if (level) {
 179         s->dma_enabled = 1;
 180         DPRINTF("Raise enable\n");
 181         if (s->dma_cb) {
 182             s->dma_cb(s);
 183             s->dma_cb = NULL;
 184         }
 185     } else {
 186         DPRINTF("Lower enable\n");
 187         s->dma_enabled = 0;
 188     }
 189 }
 190
 191 static void esp_request_cancelled(SCSIRequest *req)
 192 {
 193     ESPState *s = DO_UPCAST(ESPState, busdev.qdev, req->bus->qbus.parent);
 194
 195     if (req == s->current_req) {
 196         scsi_req_unref(s->current_req);
 197         s->current_req = NULL;
 198         s->current_dev = NULL;
 199     }
 200 }
 201
 202 static uint32_t get_cmd(ESPState *s, uint8_t *buf)
 203 {
 204     uint32_t dmalen;
 205     int target;
 206
 207     target = s->wregs[ESP_WBUSID] & BUSID_DID;
 208     if (s->dma) {
 209         dmalen = s->rregs[ESP_TCLO] | (s->rregs[ESP_TCMID] << 8);
 210         s->dma_memory_read(s->dma_opaque, buf, dmalen);
 211     } else {
 212         dmalen = s->ti_size;
 213         memcpy(buf, s->ti_buf, dmalen);
 214         buf[0] = buf[2] >> 5;
 215     }
 216     DPRINTF("get_cmd: len %d target %d\n", dmalen, target);
 217
 218     s->ti_size = 0;
 219     s->ti_rptr = 0;
 220     s->ti_wptr = 0;
 221
 222     if (s->current_req) {
 223         /* Started a new command before the old one finished.  Cancel it.  */
 224         scsi_req_cancel(s->current_req);
 225         s->async_len = 0;
 226     }
 227
 228     if (target >= ESP_MAX_DEVS || !s->bus.devs[target]) {
 229         // No such drive
 230         s->rregs[ESP_RSTAT] = 0;
 231         s->rregs[ESP_RINTR] = INTR_DC;
 232         s->rregs[ESP_RSEQ] = SEQ_0;
 233         esp_raise_irq(s);
 234         return 0;
 235     }
 236     s->current_dev = s->bus.devs[target];
 237     return dmalen;
 238 }
 239
 240 static void do_busid_cmd(ESPState *s, uint8_t *buf, uint8_t busid)
 241 {
 242     int32_t datalen;
 243     int lun;
 244
 245     DPRINTF("do_busid_cmd: busid 0x%x\n", busid);
 246     lun = busid & 7;
 247     s->current_req = scsi_req_new(s->current_dev, 0, lun, NULL);
 248     datalen = scsi_req_enqueue(s->current_req, buf);
 249     s->ti_size = datalen;
 250     if (datalen != 0) {
 251         s->rregs[ESP_RSTAT] = STAT_TC;
 252         s->dma_left = 0;
 253         s->dma_counter = 0;
 254         if (datalen > 0) {
 255             s->rregs[ESP_RSTAT] |= STAT_DI;
 256         } else {
 257             s->rregs[ESP_RSTAT] |= STAT_DO;
 258         }
 259         scsi_req_continue(s->current_req);
 260     }
 261     s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 262     s->rregs[ESP_RSEQ] = SEQ_CD;
 263     esp_raise_irq(s);
 264 }
 265
 266 static void do_cmd(ESPState *s, uint8_t *buf)
 267 {
 268     uint8_t busid = buf[0];
 269
 270     do_busid_cmd(s, &buf[1], busid);
 271 }
 272
 273 static void handle_satn(ESPState *s)
 274 {
 275     uint8_t buf[32];
 276     int len;
 277
 278     if (!s->dma_enabled) {
 279         s->dma_cb = handle_satn;
 280         return;
 281     }
 282     len = get_cmd(s, buf);
 283     if (len)
 284         do_cmd(s, buf);
 285 }
 286
 287 static void handle_s_without_atn(ESPState *s)
 288 {
 289     uint8_t buf[32];
 290     int len;
 291
 292     if (!s->dma_enabled) {
 293         s->dma_cb = handle_s_without_atn;
 294         return;
 295     }
 296     len = get_cmd(s, buf);
 297     if (len) {
 298         do_busid_cmd(s, buf, 0);
 299     }
 300 }
 301
 302 static void handle_satn_stop(ESPState *s)
 303 {
 304     if (!s->dma_enabled) {
 305         s->dma_cb = handle_satn_stop;
 306         return;
 307     }
 308     s->cmdlen = get_cmd(s, s->cmdbuf);
 309     if (s->cmdlen) {
 310         DPRINTF("Set ATN & Stop: cmdlen %d\n", s->cmdlen);
 311         s->do_cmd = 1;
 312         s->rregs[ESP_RSTAT] = STAT_TC | STAT_CD;
 313         s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 314         s->rregs[ESP_RSEQ] = SEQ_CD;
 315         esp_raise_irq(s);
 316     }
 317 }
 318
 319 static void write_response(ESPState *s)
 320 {
 321     DPRINTF("Transfer status (status=%d)\n", s->status);
 322     s->ti_buf[0] = s->status;
 323     s->ti_buf[1] = 0;
 324     if (s->dma) {
 325         s->dma_memory_write(s->dma_opaque, s->ti_buf, 2);
 326         s->rregs[ESP_RSTAT] = STAT_TC | STAT_ST;
 327         s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
 328         s->rregs[ESP_RSEQ] = SEQ_CD;
 329     } else {
 330         s->ti_size = 2;
 331         s->ti_rptr = 0;
 332         s->ti_wptr = 0;
 333         s->rregs[ESP_RFLAGS] = 2;
 334     }
 335     esp_raise_irq(s);
 336 }
 337
 338 static void esp_dma_done(ESPState *s)
 339 {
 340     s->rregs[ESP_RSTAT] |= STAT_TC;
 341     s->rregs[ESP_RINTR] = INTR_BS;
 342     s->rregs[ESP_RSEQ] = 0;
 343     s->rregs[ESP_RFLAGS] = 0;
 344     s->rregs[ESP_TCLO] = 0;
 345     s->rregs[ESP_TCMID] = 0;
 346     esp_raise_irq(s);
 347 }
 348
 349 static void esp_do_dma(ESPState *s)
 350 {
 351     uint32_t len;
 352     int to_device;
 353
 354     to_device = (s->ti_size < 0);
 355     len = s->dma_left;
 356     if (s->do_cmd) {
 357         DPRINTF("command len %d + %d\n", s->cmdlen, len);
 358         s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
 359         s->ti_size = 0;
 360         s->cmdlen = 0;
 361         s->do_cmd = 0;
 362         do_cmd(s, s->cmdbuf);
 363         return;
 364     }
 365     if (s->async_len == 0) {
 366         /* Defer until data is available.  */
 367         return;
 368     }
 369     if (len > s->async_len) {
 370         len = s->async_len;
 371     }
 372     if (to_device) {
 373         s->dma_memory_read(s->dma_opaque, s->async_buf, len);
 374     } else {
 375         s->dma_memory_write(s->dma_opaque, s->async_buf, len);
 376     }
 377     s->dma_left -= len;
 378     s->async_buf += len;
 379     s->async_len -= len;
 380     if (to_device)
 381         s->ti_size += len;
 382     else
 383         s->ti_size -= len;
 384     if (s->async_len == 0) {
 385         scsi_req_continue(s->current_req);
 386         /* If there is still data to be read from the device then
 387            complete the DMA operation immediately.  Otherwise defer
 388            until the scsi layer has completed.  */
 389         if (to_device || s->dma_left != 0 || s->ti_size == 0) {
 390             return;
 391         }
 392     }
 393
 394     /* Partially filled a scsi buffer. Complete immediately.  */
 395     esp_dma_done(s);
 396 }
 397
 398 static void esp_command_complete(SCSIRequest *req, uint32_t status)
 399 {
 400     ESPState *s = DO_UPCAST(ESPState, busdev.qdev, req->bus->qbus.parent);
 401
 402     DPRINTF("SCSI Command complete\n");
 403     if (s->ti_size != 0) {
 404         DPRINTF("SCSI command completed unexpectedly\n");
 405     }
 406     s->ti_size = 0;
 407     s->dma_left = 0;
 408     s->async_len = 0;
 409     if (status) {
 410         DPRINTF("Command failed\n");
 411     }
 412     s->status = status;
 413     s->rregs[ESP_RSTAT] = STAT_ST;
 414     esp_dma_done(s);
 415     if (s->current_req) {
 416         scsi_req_unref(s->current_req);
 417         s->current_req = NULL;
 418         s->current_dev = NULL;
 419     }
 420 }
 421
 422 static void esp_transfer_data(SCSIRequest *req, uint32_t len)
 423 {
 424     ESPState *s = DO_UPCAST(ESPState, busdev.qdev, req->bus->qbus.parent);
 425
 426     DPRINTF("transfer %d/%d\n", s->dma_left, s->ti_size);
 427     s->async_len = len;
 428     s->async_buf = scsi_req_get_buf(req);
 429     if (s->dma_left) {
 430         esp_do_dma(s);
 431     } else if (s->dma_counter != 0 && s->ti_size <= 0) {
 432         /* If this was the last part of a DMA transfer then the
 433            completion interrupt is deferred to here.  */
 434         esp_dma_done(s);
 435     }
 436 }
 437
 438 static void handle_ti(ESPState *s)
 439 {
 440     uint32_t dmalen, minlen;
 441
 442     dmalen = s->rregs[ESP_TCLO] | (s->rregs[ESP_TCMID] << 8);
 443     if (dmalen==0) {
 444       dmalen=0x10000;
 445     }
 446     s->dma_counter = dmalen;
 447
 448     if (s->do_cmd)
 449         minlen = (dmalen < 32) ? dmalen : 32;
 450     else if (s->ti_size < 0)
 451         minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
 452     else
 453         minlen = (dmalen < s->ti_size) ? dmalen : s->ti_size;
 454     DPRINTF("Transfer Information len %d\n", minlen);
 455     if (s->dma) {
 456         s->dma_left = minlen;
 457         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 458         esp_do_dma(s);
 459     } else if (s->do_cmd) {
 460         DPRINTF("command len %d\n", s->cmdlen);
 461         s->ti_size = 0;
 462         s->cmdlen = 0;
 463         s->do_cmd = 0;
 464         do_cmd(s, s->cmdbuf);
 465         return;
 466     }
 467 }
 468
 469 static void esp_hard_reset(DeviceState *d)
 470 {
 471     ESPState *s = container_of(d, ESPState, busdev.qdev);
 472
 473     memset(s->rregs, 0, ESP_REGS);
 474     memset(s->wregs, 0, ESP_REGS);
 475     s->rregs[ESP_TCHI] = TCHI_FAS100A; // Indicate fas100a
 476     s->ti_size = 0;
 477     s->ti_rptr = 0;
 478     s->ti_wptr = 0;
 479     s->dma = 0;
 480     s->do_cmd = 0;
 481     s->dma_cb = NULL;
 482
 483     s->rregs[ESP_CFG1] = 7;
 484 }
 485
 486 static void esp_soft_reset(DeviceState *d)
 487 {
 488     ESPState *s = container_of(d, ESPState, busdev.qdev);
 489
 490     qemu_irq_lower(s->irq);
 491     esp_hard_reset(d);
 492 }
 493
 494 static void parent_esp_reset(void *opaque, int irq, int level)
 495 {
 496     if (level) {
 497         esp_soft_reset(opaque);
 498     }
 499 }
 500
 501 static void esp_gpio_demux(void *opaque, int irq, int level)
 502 {
 503     switch (irq) {
 504     case 0:
 505         parent_esp_reset(opaque, irq, level);
 506         break;
 507     case 1:
 508         esp_dma_enable(opaque, irq, level);
 509         break;
 510     }
 511 }
 512
 513 static uint32_t esp_mem_readb(void *opaque, target_phys_addr_t addr)
 514 {
 515     ESPState *s = opaque;
 516     uint32_t saddr, old_val;
 517
 518     saddr = addr >> s->it_shift;
 519     DPRINTF("read reg[%d]: 0x%2.2x\n", saddr, s->rregs[saddr]);
 520     switch (saddr) {
 521     case ESP_FIFO:
 522         if (s->ti_size > 0) {
 523             s->ti_size--;
 524             if ((s->rregs[ESP_RSTAT] & STAT_PIO_MASK) == 0) {
 525                 /* Data out.  */
 526                 ESP_ERROR("PIO data read not implemented\n");
 527                 s->rregs[ESP_FIFO] = 0;
 528             } else {
 529                 s->rregs[ESP_FIFO] = s->ti_buf[s->ti_rptr++];
 530             }
 531             esp_raise_irq(s);
 532         }
 533         if (s->ti_size == 0) {
 534             s->ti_rptr = 0;
 535             s->ti_wptr = 0;
 536         }
 537         break;
 538     case ESP_RINTR:
 539         /* Clear sequence step, interrupt register and all status bits
 540            except TC */
 541         old_val = s->rregs[ESP_RINTR];
 542         s->rregs[ESP_RINTR] = 0;
 543         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 544         s->rregs[ESP_RSEQ] = SEQ_CD;
 545         esp_lower_irq(s);
 546
 547         return old_val;
 548     default:
 549         break;
 550     }
 551     return s->rregs[saddr];
 552 }
 553
 554 static void esp_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
 555 {
 556     ESPState *s = opaque;
 557     uint32_t saddr;
 558
 559     saddr = addr >> s->it_shift;
 560     DPRINTF("write reg[%d]: 0x%2.2x -> 0x%2.2x\n", saddr, s->wregs[saddr],
 561             val);
 562     switch (saddr) {
 563     case ESP_TCLO:
 564     case ESP_TCMID:
 565         s->rregs[ESP_RSTAT] &= ~STAT_TC;
 566         break;
 567     case ESP_FIFO:
 568         if (s->do_cmd) {
 569             s->cmdbuf[s->cmdlen++] = val & 0xff;
 570         } else if (s->ti_size == TI_BUFSZ - 1) {
 571             ESP_ERROR("fifo overrun\n");
 572         } else {
 573             s->ti_size++;
 574             s->ti_buf[s->ti_wptr++] = val & 0xff;
 575         }
 576         break;
 577     case ESP_CMD:
 578         s->rregs[saddr] = val;
 579         if (val & CMD_DMA) {
 580             s->dma = 1;
 581             /* Reload DMA counter.  */
 582             s->rregs[ESP_TCLO] = s->wregs[ESP_TCLO];
 583             s->rregs[ESP_TCMID] = s->wregs[ESP_TCMID];
 584         } else {
 585             s->dma = 0;
 586         }
 587         switch(val & CMD_CMD) {
 588         case CMD_NOP:
 589             DPRINTF("NOP (%2.2x)\n", val);
 590             break;
 591         case CMD_FLUSH:
 592             DPRINTF("Flush FIFO (%2.2x)\n", val);
 593             //s->ti_size = 0;
 594             s->rregs[ESP_RINTR] = INTR_FC;
 595             s->rregs[ESP_RSEQ] = 0;
 596             s->rregs[ESP_RFLAGS] = 0;
 597             break;
 598         case CMD_RESET:
 599             DPRINTF("Chip reset (%2.2x)\n", val);
 600             esp_soft_reset(&s->busdev.qdev);
 601             break;
 602         case CMD_BUSRESET:
 603             DPRINTF("Bus reset (%2.2x)\n", val);
 604             s->rregs[ESP_RINTR] = INTR_RST;
 605             if (!(s->wregs[ESP_CFG1] & CFG1_RESREPT)) {
 606                 esp_raise_irq(s);
 607             }
 608             break;
 609         case CMD_TI:
 610             handle_ti(s);
 611             break;
 612         case CMD_ICCS:
 613             DPRINTF("Initiator Command Complete Sequence (%2.2x)\n", val);
 614             write_response(s);
 615             s->rregs[ESP_RINTR] = INTR_FC;
 616             s->rregs[ESP_RSTAT] |= STAT_MI;
 617             break;
 618         case CMD_MSGACC:
 619             DPRINTF("Message Accepted (%2.2x)\n", val);
 620             s->rregs[ESP_RINTR] = INTR_DC;
 621             s->rregs[ESP_RSEQ] = 0;
 622             s->rregs[ESP_RFLAGS] = 0;
 623             esp_raise_irq(s);
 624             break;
 625         case CMD_PAD:
 626             DPRINTF("Transfer padding (%2.2x)\n", val);
 627             s->rregs[ESP_RSTAT] = STAT_TC;
 628             s->rregs[ESP_RINTR] = INTR_FC;
 629             s->rregs[ESP_RSEQ] = 0;
 630             break;
 631         case CMD_SATN:
 632             DPRINTF("Set ATN (%2.2x)\n", val);
 633             break;
 634         case CMD_SEL:
 635             DPRINTF("Select without ATN (%2.2x)\n", val);
 636             handle_s_without_atn(s);
 637             break;
 638         case CMD_SELATN:
 639             DPRINTF("Select with ATN (%2.2x)\n", val);
 640             handle_satn(s);
 641             break;
 642         case CMD_SELATNS:
 643             DPRINTF("Select with ATN & stop (%2.2x)\n", val);
 644             handle_satn_stop(s);
 645             break;
 646         case CMD_ENSEL:
 647             DPRINTF("Enable selection (%2.2x)\n", val);
 648             s->rregs[ESP_RINTR] = 0;
 649             break;
 650         default:
 651             ESP_ERROR("Unhandled ESP command (%2.2x)\n", val);
 652             break;
 653         }
 654         break;
 655     case ESP_WBUSID ... ESP_WSYNO:
 656         break;
 657     case ESP_CFG1:
 658         s->rregs[saddr] = val;
 659         break;
 660     case ESP_WCCF ... ESP_WTEST:
 661         break;
 662     case ESP_CFG2 ... ESP_RES4:
 663         s->rregs[saddr] = val;
 664         break;
 665     default:
 666         ESP_ERROR("invalid write of 0x%02x at [0x%x]\n", val, saddr);
 667         return;
 668     }
 669     s->wregs[saddr] = val;
 670 }
 671
 672 static CPUReadMemoryFunc * const esp_mem_read[3] = {
 673     esp_mem_readb,
 674     NULL,
 675     NULL,
 676 };
 677
 678 static CPUWriteMemoryFunc * const esp_mem_write[3] = {
 679     esp_mem_writeb,
 680     NULL,
 681     esp_mem_writeb,
 682 };
 683
 684 static const VMStateDescription vmstate_esp = {
 685     .name ="esp",
 686     .version_id = 3,
 687     .minimum_version_id = 3,
 688     .minimum_version_id_old = 3,
 689     .fields      = (VMStateField []) {
 690         VMSTATE_BUFFER(rregs, ESPState),
 691         VMSTATE_BUFFER(wregs, ESPState),
 692         VMSTATE_INT32(ti_size, ESPState),
 693         VMSTATE_UINT32(ti_rptr, ESPState),
 694         VMSTATE_UINT32(ti_wptr, ESPState),
 695         VMSTATE_BUFFER(ti_buf, ESPState),
 696         VMSTATE_UINT32(status, ESPState),
 697         VMSTATE_UINT32(dma, ESPState),
 698         VMSTATE_BUFFER(cmdbuf, ESPState),
 699         VMSTATE_UINT32(cmdlen, ESPState),
 700         VMSTATE_UINT32(do_cmd, ESPState),
 701         VMSTATE_UINT32(dma_left, ESPState),
 702         VMSTATE_END_OF_LIST()
 703     }
 704 };
 705
 706 void esp_init(target_phys_addr_t espaddr, int it_shift,
 707               ESPDMAMemoryReadWriteFunc dma_memory_read,
 708               ESPDMAMemoryReadWriteFunc dma_memory_write,
 709               void *dma_opaque, qemu_irq irq, qemu_irq *reset,
 710               qemu_irq *dma_enable)
 711 {
 712     DeviceState *dev;
 713     SysBusDevice *s;
 714     ESPState *esp;
 715
 716     dev = qdev_create(NULL, "esp");
 717     esp = DO_UPCAST(ESPState, busdev.qdev, dev);
 718     esp->dma_memory_read = dma_memory_read;
 719     esp->dma_memory_write = dma_memory_write;
 720     esp->dma_opaque = dma_opaque;
 721     esp->it_shift = it_shift;
 722     /* XXX for now until rc4030 has been changed to use DMA enable signal */
 723     esp->dma_enabled = 1;
 724     qdev_init_nofail(dev);
 725     s = sysbus_from_qdev(dev);
 726     sysbus_connect_irq(s, 0, irq);
 727     sysbus_mmio_map(s, 0, espaddr);
 728     *reset = qdev_get_gpio_in(dev, 0);
 729     *dma_enable = qdev_get_gpio_in(dev, 1);
 730 }
 731
 732 static const struct SCSIBusOps esp_scsi_ops = {
 733     .transfer_data = esp_transfer_data,
 734     .complete = esp_command_complete,
 735     .cancel = esp_request_cancelled
 736 };
 737
 738 static int esp_init1(SysBusDevice *dev)
 739 {
 740     ESPState *s = FROM_SYSBUS(ESPState, dev);
 741     int esp_io_memory;
 742
 743     sysbus_init_irq(dev, &s->irq);
 744     assert(s->it_shift != -1);
 745
 746     esp_io_memory = cpu_register_io_memory(esp_mem_read, esp_mem_write, s,
 747                                            DEVICE_NATIVE_ENDIAN);
 748     sysbus_init_mmio(dev, ESP_REGS << s->it_shift, esp_io_memory);
 749
 750     qdev_init_gpio_in(&dev->qdev, esp_gpio_demux, 2);
 751
 752     scsi_bus_new(&s->bus, &dev->qdev, 0, ESP_MAX_DEVS, &esp_scsi_ops);
 753     return scsi_bus_legacy_handle_cmdline(&s->bus);
 754 }
 755
 756 static SysBusDeviceInfo esp_info = {
 757     .init = esp_init1,
 758     .qdev.name  = "esp",
 759     .qdev.size  = sizeof(ESPState),
 760     .qdev.vmsd  = &vmstate_esp,
 761     .qdev.reset = esp_hard_reset,
 762     .qdev.props = (Property[]) {
 763         {.name = NULL}
 764     }
 765 };
 766
 767 static void esp_register_devices(void)
 768 {
 769     sysbus_register_withprop(&esp_info);
 770 }
 771
 772 device_init(esp_register_devices)