hw/lsi53c895a.c

   1 /*
   2  * QEMU LSI53C895A SCSI Host Bus Adapter emulation
   3  *
   4  * Copyright (c) 2006 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licenced under the LGPL.
   8  */
   9
  10 /* ??? Need to check if the {read,write}[wl] routines work properly on
  11    big-endian targets.  */
  12
  13 #include "vl.h"
  14
  15 //#define DEBUG_LSI
  16 //#define DEBUG_LSI_REG
  17
  18 #ifdef DEBUG_LSI
  19 #define DPRINTF(fmt, args...) \
  20 do { printf("lsi_scsi: " fmt , ##args); } while (0)
  21 #define BADF(fmt, args...) \
  22 do { fprintf(stderr, "lsi_scsi: error: " fmt , ##args); exit(1);} while (0)
  23 #else
  24 #define DPRINTF(fmt, args...) do {} while(0)
  25 #define BADF(fmt, args...) \
  26 do { fprintf(stderr, "lsi_scsi: error: " fmt , ##args);} while (0)
  27 #endif
  28
  29 #define LSI_SCNTL0_TRG    0x01
  30 #define LSI_SCNTL0_AAP    0x02
  31 #define LSI_SCNTL0_EPC    0x08
  32 #define LSI_SCNTL0_WATN   0x10
  33 #define LSI_SCNTL0_START  0x20
  34
  35 #define LSI_SCNTL1_SST    0x01
  36 #define LSI_SCNTL1_IARB   0x02
  37 #define LSI_SCNTL1_AESP   0x04
  38 #define LSI_SCNTL1_RST    0x08
  39 #define LSI_SCNTL1_CON    0x10
  40 #define LSI_SCNTL1_DHP    0x20
  41 #define LSI_SCNTL1_ADB    0x40
  42 #define LSI_SCNTL1_EXC    0x80
  43
  44 #define LSI_SCNTL2_WSR    0x01
  45 #define LSI_SCNTL2_VUE0   0x02
  46 #define LSI_SCNTL2_VUE1   0x04
  47 #define LSI_SCNTL2_WSS    0x08
  48 #define LSI_SCNTL2_SLPHBEN 0x10
  49 #define LSI_SCNTL2_SLPMD  0x20
  50 #define LSI_SCNTL2_CHM    0x40
  51 #define LSI_SCNTL2_SDU    0x80
  52
  53 #define LSI_ISTAT0_DIP    0x01
  54 #define LSI_ISTAT0_SIP    0x02
  55 #define LSI_ISTAT0_INTF   0x04
  56 #define LSI_ISTAT0_CON    0x08
  57 #define LSI_ISTAT0_SEM    0x10
  58 #define LSI_ISTAT0_SIGP   0x20
  59 #define LSI_ISTAT0_SRST   0x40
  60 #define LSI_ISTAT0_ABRT   0x80
  61
  62 #define LSI_ISTAT1_SI     0x01
  63 #define LSI_ISTAT1_SRUN   0x02
  64 #define LSI_ISTAT1_FLSH   0x04
  65
  66 #define LSI_SSTAT0_SDP0   0x01
  67 #define LSI_SSTAT0_RST    0x02
  68 #define LSI_SSTAT0_WOA    0x04
  69 #define LSI_SSTAT0_LOA    0x08
  70 #define LSI_SSTAT0_AIP    0x10
  71 #define LSI_SSTAT0_OLF    0x20
  72 #define LSI_SSTAT0_ORF    0x40
  73 #define LSI_SSTAT0_ILF    0x80
  74
  75 #define LSI_SIST0_PAR     0x01
  76 #define LSI_SIST0_RST     0x02
  77 #define LSI_SIST0_UDC     0x04
  78 #define LSI_SIST0_SGE     0x08
  79 #define LSI_SIST0_RSL     0x10
  80 #define LSI_SIST0_SEL     0x20
  81 #define LSI_SIST0_CMP     0x40
  82 #define LSI_SIST0_MA      0x80
  83
  84 #define LSI_SIST1_HTH     0x01
  85 #define LSI_SIST1_GEN     0x02
  86 #define LSI_SIST1_STO     0x04
  87 #define LSI_SIST1_SBMC    0x10
  88
  89 #define LSI_SOCL_IO       0x01
  90 #define LSI_SOCL_CD       0x02
  91 #define LSI_SOCL_MSG      0x04
  92 #define LSI_SOCL_ATN      0x08
  93 #define LSI_SOCL_SEL      0x10
  94 #define LSI_SOCL_BSY      0x20
  95 #define LSI_SOCL_ACK      0x40
  96 #define LSI_SOCL_REQ      0x80
  97
  98 #define LSI_DSTAT_IID     0x01
  99 #define LSI_DSTAT_SIR     0x04
 100 #define LSI_DSTAT_SSI     0x08
 101 #define LSI_DSTAT_ABRT    0x10
 102 #define LSI_DSTAT_BF      0x20
 103 #define LSI_DSTAT_MDPE    0x40
 104 #define LSI_DSTAT_DFE     0x80
 105
 106 #define LSI_DCNTL_COM     0x01
 107 #define LSI_DCNTL_IRQD    0x02
 108 #define LSI_DCNTL_STD     0x04
 109 #define LSI_DCNTL_IRQM    0x08
 110 #define LSI_DCNTL_SSM     0x10
 111 #define LSI_DCNTL_PFEN    0x20
 112 #define LSI_DCNTL_PFF     0x40
 113 #define LSI_DCNTL_CLSE    0x80
 114
 115 #define LSI_DMODE_MAN     0x01
 116 #define LSI_DMODE_BOF     0x02
 117 #define LSI_DMODE_ERMP    0x04
 118 #define LSI_DMODE_ERL     0x08
 119 #define LSI_DMODE_DIOM    0x10
 120 #define LSI_DMODE_SIOM    0x20
 121
 122 #define LSI_CTEST2_DACK   0x01
 123 #define LSI_CTEST2_DREQ   0x02
 124 #define LSI_CTEST2_TEOP   0x04
 125 #define LSI_CTEST2_PCICIE 0x08
 126 #define LSI_CTEST2_CM     0x10
 127 #define LSI_CTEST2_CIO    0x20
 128 #define LSI_CTEST2_SIGP   0x40
 129 #define LSI_CTEST2_DDIR   0x80
 130
 131 #define LSI_CTEST5_BL2    0x04
 132 #define LSI_CTEST5_DDIR   0x08
 133 #define LSI_CTEST5_MASR   0x10
 134 #define LSI_CTEST5_DFSN   0x20
 135 #define LSI_CTEST5_BBCK   0x40
 136 #define LSI_CTEST5_ADCK   0x80
 137
 138 #define LSI_CCNTL0_DILS   0x01
 139 #define LSI_CCNTL0_DISFC  0x10
 140 #define LSI_CCNTL0_ENNDJ  0x20
 141 #define LSI_CCNTL0_PMJCTL 0x40
 142 #define LSI_CCNTL0_ENPMJ  0x80
 143
 144 #define PHASE_DO          0
 145 #define PHASE_DI          1
 146 #define PHASE_CMD         2
 147 #define PHASE_ST          3
 148 #define PHASE_MO          6
 149 #define PHASE_MI          7
 150 #define PHASE_MASK        7
 151
 152 /* The HBA is ID 7, so for simplicitly limit to 7 devices.  */
 153 #define LSI_MAX_DEVS      7
 154
 155 /* Maximum length of MSG IN data.  */
 156 #define LSI_MAX_MSGIN_LEN 8
 157
 158 /* Flag set if this is a tagged command.  */
 159 #define LSI_TAG_VALID     (1 << 16)
 160
 161 typedef struct {
 162     uint32_t tag;
 163     uint32_t pending;
 164     int out;
 165 } lsi_queue;
 166
 167 typedef struct {
 168     PCIDevice pci_dev;
 169     int mmio_io_addr;
 170     int ram_io_addr;
 171     uint32_t script_ram_base;
 172
 173     int carry; /* ??? Should this be an a visible register somewhere?  */
 174     int sense;
 175     /* Action to take at the end of a MSG IN phase.
 176        0 = COMMAND, 1 = disconect, 2 = DATA OUT, 3 = DATA IN.  */
 177     int msg_action;
 178     int msg_len;
 179     uint8_t msg[LSI_MAX_MSGIN_LEN];
 180     /* 0 if SCRIPTS are running or stopped.
 181      * 1 if a Wait Reselect instruction has been issued.
 182      * 2 if processing DMA from lsi_execute_script.
 183      * 3 if a DMA operation is in progress.  */
 184     int waiting;
 185     SCSIDevice *scsi_dev[LSI_MAX_DEVS];
 186     SCSIDevice *current_dev;
 187     int current_lun;
 188     /* The tag is a combination of the device ID and the SCSI tag.  */
 189     uint32_t current_tag;
 190     uint32_t current_dma_len;
 191     uint8_t *dma_buf;
 192     lsi_queue *queue;
 193     int queue_len;
 194     int active_commands;
 195
 196     uint32_t dsa;
 197     uint32_t temp;
 198     uint32_t dnad;
 199     uint32_t dbc;
 200     uint8_t istat0;
 201     uint8_t istat1;
 202     uint8_t dcmd;
 203     uint8_t dstat;
 204     uint8_t dien;
 205     uint8_t sist0;
 206     uint8_t sist1;
 207     uint8_t sien0;
 208     uint8_t sien1;
 209     uint8_t mbox0;
 210     uint8_t mbox1;
 211     uint8_t dfifo;
 212     uint8_t ctest3;
 213     uint8_t ctest4;
 214     uint8_t ctest5;
 215     uint8_t ccntl0;
 216     uint8_t ccntl1;
 217     uint32_t dsp;
 218     uint32_t dsps;
 219     uint8_t dmode;
 220     uint8_t dcntl;
 221     uint8_t scntl0;
 222     uint8_t scntl1;
 223     uint8_t scntl2;
 224     uint8_t scntl3;
 225     uint8_t sstat0;
 226     uint8_t sstat1;
 227     uint8_t scid;
 228     uint8_t sxfer;
 229     uint8_t socl;
 230     uint8_t sdid;
 231     uint8_t ssid;
 232     uint8_t sfbr;
 233     uint8_t stest1;
 234     uint8_t stest2;
 235     uint8_t stest3;
 236     uint8_t sidl;
 237     uint8_t stime0;
 238     uint8_t respid0;
 239     uint8_t respid1;
 240     uint32_t mmrs;
 241     uint32_t mmws;
 242     uint32_t sfs;
 243     uint32_t drs;
 244     uint32_t sbms;
 245     uint32_t dmbs;
 246     uint32_t dnad64;
 247     uint32_t pmjad1;
 248     uint32_t pmjad2;
 249     uint32_t rbc;
 250     uint32_t ua;
 251     uint32_t ia;
 252     uint32_t sbc;
 253     uint32_t csbc;
 254     uint32_t scratch[18]; /* SCRATCHA-SCRATCHR */
 255
 256     /* Script ram is stored as 32-bit words in host byteorder.  */
 257     uint32_t script_ram[2048];
 258 } LSIState;
 259
 260 static void lsi_soft_reset(LSIState *s)
 261 {
 262     DPRINTF("Reset\n");
 263     s->carry = 0;
 264
 265     s->waiting = 0;
 266     s->dsa = 0;
 267     s->dnad = 0;
 268     s->dbc = 0;
 269     s->temp = 0;
 270     memset(s->scratch, 0, sizeof(s->scratch));
 271     s->istat0 = 0;
 272     s->istat1 = 0;
 273     s->dcmd = 0;
 274     s->dstat = 0;
 275     s->dien = 0;
 276     s->sist0 = 0;
 277     s->sist1 = 0;
 278     s->sien0 = 0;
 279     s->sien1 = 0;
 280     s->mbox0 = 0;
 281     s->mbox1 = 0;
 282     s->dfifo = 0;
 283     s->ctest3 = 0;
 284     s->ctest4 = 0;
 285     s->ctest5 = 0;
 286     s->ccntl0 = 0;
 287     s->ccntl1 = 0;
 288     s->dsp = 0;
 289     s->dsps = 0;
 290     s->dmode = 0;
 291     s->dcntl = 0;
 292     s->scntl0 = 0xc0;
 293     s->scntl1 = 0;
 294     s->scntl2 = 0;
 295     s->scntl3 = 0;
 296     s->sstat0 = 0;
 297     s->sstat1 = 0;
 298     s->scid = 7;
 299     s->sxfer = 0;
 300     s->socl = 0;
 301     s->stest1 = 0;
 302     s->stest2 = 0;
 303     s->stest3 = 0;
 304     s->sidl = 0;
 305     s->stime0 = 0;
 306     s->respid0 = 0x80;
 307     s->respid1 = 0;
 308     s->mmrs = 0;
 309     s->mmws = 0;
 310     s->sfs = 0;
 311     s->drs = 0;
 312     s->sbms = 0;
 313     s->dmbs = 0;
 314     s->dnad64 = 0;
 315     s->pmjad1 = 0;
 316     s->pmjad2 = 0;
 317     s->rbc = 0;
 318     s->ua = 0;
 319     s->ia = 0;
 320     s->sbc = 0;
 321     s->csbc = 0;
 322 }
 323
 324 static uint8_t lsi_reg_readb(LSIState *s, int offset);
 325 static void lsi_reg_writeb(LSIState *s, int offset, uint8_t val);
 326 static void lsi_execute_script(LSIState *s);
 327
 328 static inline uint32_t read_dword(LSIState *s, uint32_t addr)
 329 {
 330     uint32_t buf;
 331
 332     /* Optimize reading from SCRIPTS RAM.  */
 333     if ((addr & 0xffffe000) == s->script_ram_base) {
 334         return s->script_ram[(addr & 0x1fff) >> 2];
 335     }
 336     cpu_physical_memory_read(addr, (uint8_t *)&buf, 4);
 337     return cpu_to_le32(buf);
 338 }
 339
 340 static void lsi_stop_script(LSIState *s)
 341 {
 342     s->istat1 &= ~LSI_ISTAT1_SRUN;
 343 }
 344
 345 static void lsi_update_irq(LSIState *s)
 346 {
 347     int level;
 348     static int last_level;
 349
 350     /* It's unclear whether the DIP/SIP bits should be cleared when the
 351        Interrupt Status Registers are cleared or when istat0 is read.
 352        We currently do the formwer, which seems to work.  */
 353     level = 0;
 354     if (s->dstat) {
 355         if (s->dstat & s->dien)
 356             level = 1;
 357         s->istat0 |= LSI_ISTAT0_DIP;
 358     } else {
 359         s->istat0 &= ~LSI_ISTAT0_DIP;
 360     }
 361
 362     if (s->sist0 || s->sist1) {
 363         if ((s->sist0 & s->sien0) || (s->sist1 & s->sien1))
 364             level = 1;
 365         s->istat0 |= LSI_ISTAT0_SIP;
 366     } else {
 367         s->istat0 &= ~LSI_ISTAT0_SIP;
 368     }
 369     if (s->istat0 & LSI_ISTAT0_INTF)
 370         level = 1;
 371
 372     if (level != last_level) {
 373         DPRINTF("Update IRQ level %d dstat %02x sist %02x%02x\n",
 374                 level, s->dstat, s->sist1, s->sist0);
 375         last_level = level;
 376     }
 377     qemu_set_irq(s->pci_dev.irq[0], level);
 378 }
 379
 380 /* Stop SCRIPTS execution and raise a SCSI interrupt.  */
 381 static void lsi_script_scsi_interrupt(LSIState *s, int stat0, int stat1)
 382 {
 383     uint32_t mask0;
 384     uint32_t mask1;
 385
 386     DPRINTF("SCSI Interrupt 0x%02x%02x prev 0x%02x%02x\n",
 387             stat1, stat0, s->sist1, s->sist0);
 388     s->sist0 |= stat0;
 389     s->sist1 |= stat1;
 390     /* Stop processor on fatal or unmasked interrupt.  As a special hack
 391        we don't stop processing when raising STO.  Instead continue
 392        execution and stop at the next insn that accesses the SCSI bus.  */
 393     mask0 = s->sien0 | ~(LSI_SIST0_CMP | LSI_SIST0_SEL | LSI_SIST0_RSL);
 394     mask1 = s->sien1 | ~(LSI_SIST1_GEN | LSI_SIST1_HTH);
 395     mask1 &= ~LSI_SIST1_STO;
 396     if (s->sist0 & mask0 || s->sist1 & mask1) {
 397         lsi_stop_script(s);
 398     }
 399     lsi_update_irq(s);
 400 }
 401
 402 /* Stop SCRIPTS execution and raise a DMA interrupt.  */
 403 static void lsi_script_dma_interrupt(LSIState *s, int stat)
 404 {
 405     DPRINTF("DMA Interrupt 0x%x prev 0x%x\n", stat, s->dstat);
 406     s->dstat |= stat;
 407     lsi_update_irq(s);
 408     lsi_stop_script(s);
 409 }
 410
 411 static inline void lsi_set_phase(LSIState *s, int phase)
 412 {
 413     s->sstat1 = (s->sstat1 & ~PHASE_MASK) | phase;
 414 }
 415
 416 static void lsi_bad_phase(LSIState *s, int out, int new_phase)
 417 {
 418     /* Trigger a phase mismatch.  */
 419     if (s->ccntl0 & LSI_CCNTL0_ENPMJ) {
 420         if ((s->ccntl0 & LSI_CCNTL0_PMJCTL) || out) {
 421             s->dsp = s->pmjad1;
 422         } else {
 423             s->dsp = s->pmjad2;
 424         }
 425         DPRINTF("Data phase mismatch jump to %08x\n", s->dsp);
 426     } else {
 427         DPRINTF("Phase mismatch interrupt\n");
 428         lsi_script_scsi_interrupt(s, LSI_SIST0_MA, 0);
 429         lsi_stop_script(s);
 430     }
 431     lsi_set_phase(s, new_phase);
 432 }
 433
 434
 435 /* Resume SCRIPTS execution after a DMA operation.  */
 436 static void lsi_resume_script(LSIState *s)
 437 {
 438     if (s->waiting != 2) {
 439         s->waiting = 0;
 440         lsi_execute_script(s);
 441     } else {
 442         s->waiting = 0;
 443     }
 444 }
 445
 446 /* Initiate a SCSI layer data transfer.  */
 447 static void lsi_do_dma(LSIState *s, int out)
 448 {
 449     uint32_t count;
 450     uint32_t addr;
 451
 452     if (!s->current_dma_len) {
 453         /* Wait until data is available.  */
 454         DPRINTF("DMA no data available\n");
 455         return;
 456     }
 457
 458     count = s->dbc;
 459     if (count > s->current_dma_len)
 460         count = s->current_dma_len;
 461     DPRINTF("DMA addr=0x%08x len=%d\n", s->dnad, count);
 462
 463     addr = s->dnad;
 464     s->csbc += count;
 465     s->dnad += count;
 466     s->dbc -= count;
 467
 468     if (s->dma_buf == NULL) {
 469         s->dma_buf = scsi_get_buf(s->current_dev, s->current_tag);
 470     }
 471
 472     /* ??? Set SFBR to first data byte.  */
 473     if (out) {
 474         cpu_physical_memory_read(addr, s->dma_buf, count);
 475     } else {
 476         cpu_physical_memory_write(addr, s->dma_buf, count);
 477     }
 478     s->current_dma_len -= count;
 479     if (s->current_dma_len == 0) {
 480         s->dma_buf = NULL;
 481         if (out) {
 482             /* Write the data.  */
 483             scsi_write_data(s->current_dev, s->current_tag);
 484         } else {
 485             /* Request any remaining data.  */
 486             scsi_read_data(s->current_dev, s->current_tag);
 487         }
 488     } else {
 489         s->dma_buf += count;
 490         lsi_resume_script(s);
 491     }
 492 }
 493
 494
 495 /* Add a command to the queue.  */
 496 static void lsi_queue_command(LSIState *s)
 497 {
 498     lsi_queue *p;
 499
 500     DPRINTF("Queueing tag=0x%x\n", s->current_tag);
 501     if (s->queue_len == s->active_commands) {
 502         s->queue_len++;
 503         s->queue = realloc(s->queue, s->queue_len * sizeof(lsi_queue));
 504     }
 505     p = &s->queue[s->active_commands++];
 506     p->tag = s->current_tag;
 507     p->pending = 0;
 508     p->out = (s->sstat1 & PHASE_MASK) == PHASE_DO;
 509 }
 510
 511 /* Queue a byte for a MSG IN phase.  */
 512 static void lsi_add_msg_byte(LSIState *s, uint8_t data)
 513 {
 514     if (s->msg_len >= LSI_MAX_MSGIN_LEN) {
 515         BADF("MSG IN data too long\n");
 516     } else {
 517         DPRINTF("MSG IN 0x%02x\n", data);
 518         s->msg[s->msg_len++] = data;
 519     }
 520 }
 521
 522 /* Perform reselection to continue a command.  */
 523 static void lsi_reselect(LSIState *s, uint32_t tag)
 524 {
 525     lsi_queue *p;
 526     int n;
 527     int id;
 528
 529     p = NULL;
 530     for (n = 0; n < s->active_commands; n++) {
 531         p = &s->queue[n];
 532         if (p->tag == tag)
 533             break;
 534     }
 535     if (n == s->active_commands) {
 536         BADF("Reselected non-existant command tag=0x%x\n", tag);
 537         return;
 538     }
 539     id = (tag >> 8) & 0xf;
 540     s->ssid = id | 0x80;
 541     DPRINTF("Reselected target %d\n", id);
 542     s->current_dev = s->scsi_dev[id];
 543     s->current_tag = tag;
 544     s->scntl1 |= LSI_SCNTL1_CON;
 545     lsi_set_phase(s, PHASE_MI);
 546     s->msg_action = p->out ? 2 : 3;
 547     s->current_dma_len = p->pending;
 548     s->dma_buf = NULL;
 549     lsi_add_msg_byte(s, 0x80);
 550     if (s->current_tag & LSI_TAG_VALID) {
 551         lsi_add_msg_byte(s, 0x20);
 552         lsi_add_msg_byte(s, tag & 0xff);
 553     }
 554
 555     s->active_commands--;
 556     if (n != s->active_commands) {
 557         s->queue[n] = s->queue[s->active_commands];
 558     }
 559 }
 560
 561 /* Record that data is available for a queued command.  Returns zero if
 562    the device was reselected, nonzero if the IO is deferred.  */
 563 static int lsi_queue_tag(LSIState *s, uint32_t tag, uint32_t arg)
 564 {
 565     lsi_queue *p;
 566     int i;
 567     for (i = 0; i < s->active_commands; i++) {
 568         p = &s->queue[i];
 569         if (p->tag == tag) {
 570             if (p->pending) {
 571                 BADF("Multiple IO pending for tag %d\n", tag);
 572             }
 573             p->pending = arg;
 574             if (s->waiting == 1) {
 575                 /* Reselect device.  */
 576                 lsi_reselect(s, tag);
 577                 return 0;
 578             } else {
 579                DPRINTF("Queueing IO tag=0x%x\n", tag);
 580                 p->pending = arg;
 581                 return 1;
 582             }
 583         }
 584     }
 585     BADF("IO with unknown tag %d\n", tag);
 586     return 1;
 587 }
 588
 589 /* Callback to indicate that the SCSI layer has completed a transfer.  */
 590 static void lsi_command_complete(void *opaque, int reason, uint32_t tag,
 591                                  uint32_t arg)
 592 {
 593     LSIState *s = (LSIState *)opaque;
 594     int out;
 595
 596     out = (s->sstat1 & PHASE_MASK) == PHASE_DO;
 597     if (reason == SCSI_REASON_DONE) {
 598         DPRINTF("Command complete sense=%d\n", (int)arg);
 599         s->sense = arg;
 600         if (s->waiting && s->dbc != 0) {
 601             /* Raise phase mismatch for short transfers.  */
 602             lsi_bad_phase(s, out, PHASE_ST);
 603         } else {
 604             lsi_set_phase(s, PHASE_ST);
 605         }
 606         lsi_resume_script(s);
 607         return;
 608     }
 609
 610     if (s->waiting == 1 || tag != s->current_tag) {
 611         if (lsi_queue_tag(s, tag, arg))
 612             return;
 613     }
 614     DPRINTF("Data ready tag=0x%x len=%d\n", tag, arg);
 615     s->current_dma_len = arg;
 616     if (!s->waiting)
 617         return;
 618     if (s->waiting == 1 || s->dbc == 0) {
 619         lsi_resume_script(s);
 620     } else {
 621         lsi_do_dma(s, out);
 622     }
 623 }
 624
 625 static void lsi_do_command(LSIState *s)
 626 {
 627     uint8_t buf[16];
 628     int n;
 629
 630     DPRINTF("Send command len=%d\n", s->dbc);
 631     if (s->dbc > 16)
 632         s->dbc = 16;
 633     cpu_physical_memory_read(s->dnad, buf, s->dbc);
 634     s->sfbr = buf[0];
 635     n = scsi_send_command(s->current_dev, s->current_tag, buf, s->current_lun);
 636     if (n > 0) {
 637         lsi_set_phase(s, PHASE_DI);
 638         scsi_read_data(s->current_dev, s->current_tag);
 639     } else if (n < 0) {
 640         lsi_set_phase(s, PHASE_DO);
 641         scsi_write_data(s->current_dev, s->current_tag);
 642     }
 643     if (n && s->current_dma_len == 0) {
 644         /* Command did not complete immediately so disconnect.  */
 645         lsi_add_msg_byte(s, 2); /* SAVE DATA POINTER */
 646         lsi_add_msg_byte(s, 4); /* DISCONNECT */
 647         lsi_set_phase(s, PHASE_MI);
 648         s->msg_action = 1;
 649         lsi_queue_command(s);
 650     }
 651 }
 652
 653 static void lsi_do_status(LSIState *s)
 654 {
 655     uint8_t sense;
 656     DPRINTF("Get status len=%d sense=%d\n", s->dbc, s->sense);
 657     if (s->dbc != 1)
 658         BADF("Bad Status move\n");
 659     s->dbc = 1;
 660     sense = s->sense;
 661     s->sfbr = sense;
 662     cpu_physical_memory_write(s->dnad, &sense, 1);
 663     lsi_set_phase(s, PHASE_MI);
 664     s->msg_action = 1;
 665     lsi_add_msg_byte(s, 0); /* COMMAND COMPLETE */
 666 }
 667
 668 static void lsi_disconnect(LSIState *s)
 669 {
 670     s->scntl1 &= ~LSI_SCNTL1_CON;
 671     s->sstat1 &= ~PHASE_MASK;
 672 }
 673
 674 static void lsi_do_msgin(LSIState *s)
 675 {
 676     int len;
 677     DPRINTF("Message in len=%d/%d\n", s->dbc, s->msg_len);
 678     s->sfbr = s->msg[0];
 679     len = s->msg_len;
 680     if (len > s->dbc)
 681         len = s->dbc;
 682     cpu_physical_memory_write(s->dnad, s->msg, len);
 683     /* Linux drivers rely on the last byte being in the SIDL.  */
 684     s->sidl = s->msg[len - 1];
 685     s->msg_len -= len;
 686     if (s->msg_len) {
 687         memmove(s->msg, s->msg + len, s->msg_len);
 688     } else {
 689         /* ??? Check if ATN (not yet implemented) is asserted and maybe
 690            switch to PHASE_MO.  */
 691         switch (s->msg_action) {
 692         case 0:
 693             lsi_set_phase(s, PHASE_CMD);
 694             break;
 695         case 1:
 696             lsi_disconnect(s);
 697             break;
 698         case 2:
 699             lsi_set_phase(s, PHASE_DO);
 700             break;
 701         case 3:
 702             lsi_set_phase(s, PHASE_DI);
 703             break;
 704         default:
 705             abort();
 706         }
 707     }
 708 }
 709
 710 /* Read the next byte during a MSGOUT phase.  */
 711 static uint8_t lsi_get_msgbyte(LSIState *s)
 712 {
 713     uint8_t data;
 714     cpu_physical_memory_read(s->dnad, &data, 1);
 715     s->dnad++;
 716     s->dbc--;
 717     return data;
 718 }
 719
 720 static void lsi_do_msgout(LSIState *s)
 721 {
 722     uint8_t msg;
 723     int len;
 724
 725     DPRINTF("MSG out len=%d\n", s->dbc);
 726     while (s->dbc) {
 727         msg = lsi_get_msgbyte(s);
 728         s->sfbr = msg;
 729
 730         switch (msg) {
 731         case 0x00:
 732             DPRINTF("MSG: Disconnect\n");
 733             lsi_disconnect(s);
 734             break;
 735         case 0x08:
 736             DPRINTF("MSG: No Operation\n");
 737             lsi_set_phase(s, PHASE_CMD);
 738             break;
 739         case 0x01:
 740             len = lsi_get_msgbyte(s);
 741             msg = lsi_get_msgbyte(s);
 742             DPRINTF("Extended message 0x%x (len %d)\n", msg, len);
 743             switch (msg) {
 744             case 1:
 745                 DPRINTF("SDTR (ignored)\n");
 746                 s->dbc -= 2;
 747                 break;
 748             case 3:
 749                 DPRINTF("WDTR (ignored)\n");
 750                 s->dbc -= 1;
 751                 break;
 752             default:
 753                 goto bad;
 754             }
 755             break;
 756         case 0x20: /* SIMPLE queue */
 757             s->current_tag |= lsi_get_msgbyte(s) | LSI_TAG_VALID;
 758             DPRINTF("SIMPLE queue tag=0x%x\n", s->current_tag & 0xff);
 759             break;
 760         case 0x21: /* HEAD of queue */
 761             BADF("HEAD queue not implemented\n");
 762             s->current_tag |= lsi_get_msgbyte(s) | LSI_TAG_VALID;
 763             break;
 764         case 0x22: /* ORDERED queue */
 765             BADF("ORDERED queue not implemented\n");
 766             s->current_tag |= lsi_get_msgbyte(s) | LSI_TAG_VALID;
 767             break;
 768         default:
 769             if ((msg & 0x80) == 0) {
 770                 goto bad;
 771             }
 772             s->current_lun = msg & 7;
 773             DPRINTF("Select LUN %d\n", s->current_lun);
 774             lsi_set_phase(s, PHASE_CMD);
 775             break;
 776         }
 777     }
 778     return;
 779 bad:
 780     BADF("Unimplemented message 0x%02x\n", msg);
 781     lsi_set_phase(s, PHASE_MI);
 782     lsi_add_msg_byte(s, 7); /* MESSAGE REJECT */
 783     s->msg_action = 0;
 784 }
 785
 786 /* Sign extend a 24-bit value.  */
 787 static inline int32_t sxt24(int32_t n)
 788 {
 789     return (n << 8) >> 8;
 790 }
 791
 792 static void lsi_memcpy(LSIState *s, uint32_t dest, uint32_t src, int count)
 793 {
 794     int n;
 795     uint8_t buf[TARGET_PAGE_SIZE];
 796
 797     DPRINTF("memcpy dest 0x%08x src 0x%08x count %d\n", dest, src, count);
 798     while (count) {
 799         n = (count > TARGET_PAGE_SIZE) ? TARGET_PAGE_SIZE : count;
 800         cpu_physical_memory_read(src, buf, n);
 801         cpu_physical_memory_write(dest, buf, n);
 802         src += n;
 803         dest += n;
 804         count -= n;
 805     }
 806 }
 807
 808 static void lsi_wait_reselect(LSIState *s)
 809 {
 810     int i;
 811     DPRINTF("Wait Reselect\n");
 812     if (s->current_dma_len)
 813         BADF("Reselect with pending DMA\n");
 814     for (i = 0; i < s->active_commands; i++) {
 815         if (s->queue[i].pending) {
 816             lsi_reselect(s, s->queue[i].tag);
 817             break;
 818         }
 819     }
 820     if (s->current_dma_len == 0) {
 821         s->waiting = 1;
 822     }
 823 }
 824
 825 static void lsi_execute_script(LSIState *s)
 826 {
 827     uint32_t insn;
 828     uint32_t addr;
 829     int opcode;
 830
 831     s->istat1 |= LSI_ISTAT1_SRUN;
 832 again:
 833     insn = read_dword(s, s->dsp);
 834     addr = read_dword(s, s->dsp + 4);
 835     DPRINTF("SCRIPTS dsp=%08x opcode %08x arg %08x\n", s->dsp, insn, addr);
 836     s->dsps = addr;
 837     s->dcmd = insn >> 24;
 838     s->dsp += 8;
 839     switch (insn >> 30) {
 840     case 0: /* Block move.  */
 841         if (s->sist1 & LSI_SIST1_STO) {
 842             DPRINTF("Delayed select timeout\n");
 843             lsi_stop_script(s);
 844             break;
 845         }
 846         s->dbc = insn & 0xffffff;
 847         s->rbc = s->dbc;
 848         if (insn & (1 << 29)) {
 849             /* Indirect addressing.  */
 850             addr = read_dword(s, addr);
 851         } else if (insn & (1 << 28)) {
 852             uint32_t buf[2];
 853             int32_t offset;
 854             /* Table indirect addressing.  */
 855             offset = sxt24(addr);
 856             cpu_physical_memory_read(s->dsa + offset, (uint8_t *)buf, 8);
 857             s->dbc = cpu_to_le32(buf[0]);
 858             s->rbc = s->dbc;
 859             addr = cpu_to_le32(buf[1]);
 860         }
 861         if ((s->sstat1 & PHASE_MASK) != ((insn >> 24) & 7)) {
 862             DPRINTF("Wrong phase got %d expected %d\n",
 863                     s->sstat1 & PHASE_MASK, (insn >> 24) & 7);
 864             lsi_script_scsi_interrupt(s, LSI_SIST0_MA, 0);
 865             break;
 866         }
 867         s->dnad = addr;
 868         /* ??? Set ESA.  */
 869         s->ia = s->dsp - 8;
 870         switch (s->sstat1 & 0x7) {
 871         case PHASE_DO:
 872             s->waiting = 2;
 873             lsi_do_dma(s, 1);
 874             if (s->waiting)
 875                 s->waiting = 3;
 876             break;
 877         case PHASE_DI:
 878             s->waiting = 2;
 879             lsi_do_dma(s, 0);
 880             if (s->waiting)
 881                 s->waiting = 3;
 882             break;
 883         case PHASE_CMD:
 884             lsi_do_command(s);
 885             break;
 886         case PHASE_ST:
 887             lsi_do_status(s);
 888             break;
 889         case PHASE_MO:
 890             lsi_do_msgout(s);
 891             break;
 892         case PHASE_MI:
 893             lsi_do_msgin(s);
 894             break;
 895         default:
 896             BADF("Unimplemented phase %d\n", s->sstat1 & PHASE_MASK);
 897             exit(1);
 898         }
 899         s->dfifo = s->dbc & 0xff;
 900         s->ctest5 = (s->ctest5 & 0xfc) | ((s->dbc >> 8) & 3);
 901         s->sbc = s->dbc;
 902         s->rbc -= s->dbc;
 903         s->ua = addr + s->dbc;
 904         break;
 905
 906     case 1: /* IO or Read/Write instruction.  */
 907         opcode = (insn >> 27) & 7;
 908         if (opcode < 5) {
 909             uint32_t id;
 910
 911             if (insn & (1 << 25)) {
 912                 id = read_dword(s, s->dsa + sxt24(insn));
 913             } else {
 914                 id = addr;
 915             }
 916             id = (id >> 16) & 0xf;
 917             if (insn & (1 << 26)) {
 918                 addr = s->dsp + sxt24(addr);
 919             }
 920             s->dnad = addr;
 921             switch (opcode) {
 922             case 0: /* Select */
 923                 s->sdid = id;
 924                 if (s->current_dma_len && (s->ssid & 0xf) == id) {
 925                     DPRINTF("Already reselected by target %d\n", id);
 926                     break;
 927                 }
 928                 s->sstat0 |= LSI_SSTAT0_WOA;
 929                 s->scntl1 &= ~LSI_SCNTL1_IARB;
 930                 if (id >= LSI_MAX_DEVS || !s->scsi_dev[id]) {
 931                     DPRINTF("Selected absent target %d\n", id);
 932                     lsi_script_scsi_interrupt(s, 0, LSI_SIST1_STO);
 933                     lsi_disconnect(s);
 934                     break;
 935                 }
 936                 DPRINTF("Selected target %d%s\n",
 937                         id, insn & (1 << 3) ? " ATN" : "");
 938                 /* ??? Linux drivers compain when this is set.  Maybe
 939                    it only applies in low-level mode (unimplemented).
 940                 lsi_script_scsi_interrupt(s, LSI_SIST0_CMP, 0); */
 941                 s->current_dev = s->scsi_dev[id];
 942                 s->current_tag = id << 8;
 943                 s->scntl1 |= LSI_SCNTL1_CON;
 944                 if (insn & (1 << 3)) {
 945                     s->socl |= LSI_SOCL_ATN;
 946                 }
 947                 lsi_set_phase(s, PHASE_MO);
 948                 break;
 949             case 1: /* Disconnect */
 950                 DPRINTF("Wait Disconect\n");
 951                 s->scntl1 &= ~LSI_SCNTL1_CON;
 952                 break;
 953             case 2: /* Wait Reselect */
 954                 lsi_wait_reselect(s);
 955                 break;
 956             case 3: /* Set */
 957                 DPRINTF("Set%s%s%s%s\n",
 958                         insn & (1 << 3) ? " ATN" : "",
 959                         insn & (1 << 6) ? " ACK" : "",
 960                         insn & (1 << 9) ? " TM" : "",
 961                         insn & (1 << 10) ? " CC" : "");
 962                 if (insn & (1 << 3)) {
 963                     s->socl |= LSI_SOCL_ATN;
 964                     lsi_set_phase(s, PHASE_MO);
 965                 }
 966                 if (insn & (1 << 9)) {
 967                     BADF("Target mode not implemented\n");
 968                     exit(1);
 969                 }
 970                 if (insn & (1 << 10))
 971                     s->carry = 1;
 972                 break;
 973             case 4: /* Clear */
 974                 DPRINTF("Clear%s%s%s%s\n",
 975                         insn & (1 << 3) ? " ATN" : "",
 976                         insn & (1 << 6) ? " ACK" : "",
 977                         insn & (1 << 9) ? " TM" : "",
 978                         insn & (1 << 10) ? " CC" : "");
 979                 if (insn & (1 << 3)) {
 980                     s->socl &= ~LSI_SOCL_ATN;
 981                 }
 982                 if (insn & (1 << 10))
 983                     s->carry = 0;
 984                 break;
 985             }
 986         } else {
 987             uint8_t op0;
 988             uint8_t op1;
 989             uint8_t data8;
 990             int reg;
 991             int operator;
 992 #ifdef DEBUG_LSI
 993             static const char *opcode_names[3] =
 994                 {"Write", "Read", "Read-Modify-Write"};
 995             static const char *operator_names[8] =
 996                 {"MOV", "SHL", "OR", "XOR", "AND", "SHR", "ADD", "ADC"};
 997 #endif
 998
 999             reg = ((insn >> 16) & 0x7f) | (insn & 0x80);
1000             data8 = (insn >> 8) & 0xff;
1001             opcode = (insn >> 27) & 7;
1002             operator = (insn >> 24) & 7;
1003             DPRINTF("%s reg 0x%x %s data8=0x%02x sfbr=0x%02x%s\n",
1004                     opcode_names[opcode - 5], reg,
1005                     operator_names[operator], data8, s->sfbr,
1006                     (insn & (1 << 23)) ? " SFBR" : "");
1007             op0 = op1 = 0;
1008             switch (opcode) {
1009             case 5: /* From SFBR */
1010                 op0 = s->sfbr;
1011                 op1 = data8;
1012                 break;
1013             case 6: /* To SFBR */
1014                 if (operator)
1015                     op0 = lsi_reg_readb(s, reg);
1016                 op1 = data8;
1017                 break;
1018             case 7: /* Read-modify-write */
1019                 if (operator)
1020                     op0 = lsi_reg_readb(s, reg);
1021                 if (insn & (1 << 23)) {
1022                     op1 = s->sfbr;
1023                 } else {
1024                     op1 = data8;
1025                 }
1026                 break;
1027             }
1028
1029             switch (operator) {
1030             case 0: /* move */
1031                 op0 = op1;
1032                 break;
1033             case 1: /* Shift left */
1034                 op1 = op0 >> 7;
1035                 op0 = (op0 << 1) | s->carry;
1036                 s->carry = op1;
1037                 break;
1038             case 2: /* OR */
1039                 op0 |= op1;
1040                 break;
1041             case 3: /* XOR */
1042                 op0 ^= op1;
1043                 break;
1044             case 4: /* AND */
1045                 op0 &= op1;
1046                 break;
1047             case 5: /* SHR */
1048                 op1 = op0 & 1;
1049                 op0 = (op0 >> 1) | (s->carry << 7);
1050                 s->carry = op1;
1051                 break;
1052             case 6: /* ADD */
1053                 op0 += op1;
1054                 s->carry = op0 < op1;
1055                 break;
1056             case 7: /* ADC */
1057                 op0 += op1 + s->carry;
1058                 if (s->carry)
1059                     s->carry = op0 <= op1;
1060                 else
1061                     s->carry = op0 < op1;
1062                 break;
1063             }
1064
1065             switch (opcode) {
1066             case 5: /* From SFBR */
1067             case 7: /* Read-modify-write */
1068                 lsi_reg_writeb(s, reg, op0);
1069                 break;
1070             case 6: /* To SFBR */
1071                 s->sfbr = op0;
1072                 break;
1073             }
1074         }
1075         break;
1076
1077     case 2: /* Transfer Control.  */
1078         {
1079             int cond;
1080             int jmp;
1081
1082             if ((insn & 0x002e0000) == 0) {
1083                 DPRINTF("NOP\n");
1084                 break;
1085             }
1086             if (s->sist1 & LSI_SIST1_STO) {
1087                 DPRINTF("Delayed select timeout\n");
1088                 lsi_stop_script(s);
1089                 break;
1090             }
1091             cond = jmp = (insn & (1 << 19)) != 0;
1092             if (cond == jmp && (insn & (1 << 21))) {
1093                 DPRINTF("Compare carry %d\n", s->carry == jmp);
1094                 cond = s->carry != 0;
1095             }
1096             if (cond == jmp && (insn & (1 << 17))) {
1097                 DPRINTF("Compare phase %d %c= %d\n",
1098                         (s->sstat1 & PHASE_MASK),
1099                         jmp ? '=' : '!',
1100                         ((insn >> 24) & 7));
1101                 cond = (s->sstat1 & PHASE_MASK) == ((insn >> 24) & 7);
1102             }
1103             if (cond == jmp && (insn & (1 << 18))) {
1104                 uint8_t mask;
1105
1106                 mask = (~insn >> 8) & 0xff;
1107                 DPRINTF("Compare data 0x%x & 0x%x %c= 0x%x\n",
1108                         s->sfbr, mask, jmp ? '=' : '!', insn & mask);
1109                 cond = (s->sfbr & mask) == (insn & mask);
1110             }
1111             if (cond == jmp) {
1112                 if (insn & (1 << 23)) {
1113                     /* Relative address.  */
1114                     addr = s->dsp + sxt24(addr);
1115                 }
1116                 switch ((insn >> 27) & 7) {
1117                 case 0: /* Jump */
1118                     DPRINTF("Jump to 0x%08x\n", addr);
1119                     s->dsp = addr;
1120                     break;
1121                 case 1: /* Call */
1122                     DPRINTF("Call 0x%08x\n", addr);
1123                     s->temp = s->dsp;
1124                     s->dsp = addr;
1125                     break;
1126                 case 2: /* Return */
1127                     DPRINTF("Return to 0x%08x\n", s->temp);
1128                     s->dsp = s->temp;
1129                     break;
1130                 case 3: /* Interrupt */
1131                     DPRINTF("Interrupt 0x%08x\n", s->dsps);
1132                     if ((insn & (1 << 20)) != 0) {
1133                         s->istat0 |= LSI_ISTAT0_INTF;
1134                         lsi_update_irq(s);
1135                     } else {
1136                         lsi_script_dma_interrupt(s, LSI_DSTAT_SIR);
1137                     }
1138                     break;
1139                 default:
1140                     DPRINTF("Illegal transfer control\n");
1141                     lsi_script_dma_interrupt(s, LSI_DSTAT_IID);
1142                     break;
1143                 }
1144             } else {
1145                 DPRINTF("Control condition failed\n");
1146             }
1147         }
1148         break;
1149
1150     case 3:
1151         if ((insn & (1 << 29)) == 0) {
1152             /* Memory move.  */
1153             uint32_t dest;
1154             /* ??? The docs imply the destination address is loaded into
1155                the TEMP register.  However the Linux drivers rely on
1156                the value being presrved.  */
1157             dest = read_dword(s, s->dsp);
1158             s->dsp += 4;
1159             lsi_memcpy(s, dest, addr, insn & 0xffffff);
1160         } else {
1161             uint8_t data[7];
1162             int reg;
1163             int n;
1164             int i;
1165
1166             if (insn & (1 << 28)) {
1167                 addr = s->dsa + sxt24(addr);
1168             }
1169             n = (insn & 7);
1170             reg = (insn >> 16) & 0xff;
1171             if (insn & (1 << 24)) {
1172                 cpu_physical_memory_read(addr, data, n);
1173                 DPRINTF("Load reg 0x%x size %d addr 0x%08x = %08x\n", reg, n,
1174                         addr, *(int *)data);
1175                 for (i = 0; i < n; i++) {
1176                     lsi_reg_writeb(s, reg + i, data[i]);
1177                 }
1178             } else {
1179                 DPRINTF("Store reg 0x%x size %d addr 0x%08x\n", reg, n, addr);
1180                 for (i = 0; i < n; i++) {
1181                     data[i] = lsi_reg_readb(s, reg + i);
1182                 }
1183                 cpu_physical_memory_write(addr, data, n);
1184             }
1185         }
1186     }
1187     /* ??? Need to avoid infinite loops.  */
1188     if (s->istat1 & LSI_ISTAT1_SRUN && !s->waiting) {
1189         if (s->dcntl & LSI_DCNTL_SSM) {
1190             lsi_script_dma_interrupt(s, LSI_DSTAT_SSI);
1191         } else {
1192             goto again;
1193         }
1194     }
1195     DPRINTF("SCRIPTS execution stopped\n");
1196 }
1197
1198 static uint8_t lsi_reg_readb(LSIState *s, int offset)
1199 {
1200     uint8_t tmp;
1201 #define CASE_GET_REG32(name, addr) \
1202     case addr: return s->name & 0xff; \
1203     case addr + 1: return (s->name >> 8) & 0xff; \
1204     case addr + 2: return (s->name >> 16) & 0xff; \
1205     case addr + 3: return (s->name >> 24) & 0xff;
1206
1207 #ifdef DEBUG_LSI_REG
1208     DPRINTF("Read reg %x\n", offset);
1209 #endif
1210     switch (offset) {
1211     case 0x00: /* SCNTL0 */
1212         return s->scntl0;
1213     case 0x01: /* SCNTL1 */
1214         return s->scntl1;
1215     case 0x02: /* SCNTL2 */
1216         return s->scntl2;
1217     case 0x03: /* SCNTL3 */
1218         return s->scntl3;
1219     case 0x04: /* SCID */
1220         return s->scid;
1221     case 0x05: /* SXFER */
1222         return s->sxfer;
1223     case 0x06: /* SDID */
1224         return s->sdid;
1225     case 0x07: /* GPREG0 */
1226         return 0x7f;
1227     case 0xa: /* SSID */
1228         return s->ssid;
1229     case 0xb: /* SBCL */
1230         /* ??? This is not correct. However it's (hopefully) only
1231            used for diagnostics, so should be ok.  */
1232         return 0;
1233     case 0xc: /* DSTAT */
1234         tmp = s->dstat | 0x80;
1235         if ((s->istat0 & LSI_ISTAT0_INTF) == 0)
1236             s->dstat = 0;
1237         lsi_update_irq(s);
1238         return tmp;
1239     case 0x0d: /* SSTAT0 */
1240         return s->sstat0;
1241     case 0x0e: /* SSTAT1 */
1242         return s->sstat1;
1243     case 0x0f: /* SSTAT2 */
1244         return s->scntl1 & LSI_SCNTL1_CON ? 0 : 2;
1245     CASE_GET_REG32(dsa, 0x10)
1246     case 0x14: /* ISTAT0 */
1247         return s->istat0;
1248     case 0x16: /* MBOX0 */
1249         return s->mbox0;
1250     case 0x17: /* MBOX1 */
1251         return s->mbox1;
1252     case 0x18: /* CTEST0 */
1253         return 0xff;
1254     case 0x19: /* CTEST1 */
1255         return 0;
1256     case 0x1a: /* CTEST2 */
1257         tmp = LSI_CTEST2_DACK | LSI_CTEST2_CM;
1258         if (s->istat0 & LSI_ISTAT0_SIGP) {
1259             s->istat0 &= ~LSI_ISTAT0_SIGP;
1260             tmp |= LSI_CTEST2_SIGP;
1261         }
1262         return tmp;
1263     case 0x1b: /* CTEST3 */
1264         return s->ctest3;
1265     CASE_GET_REG32(temp, 0x1c)
1266     case 0x20: /* DFIFO */
1267         return 0;
1268     case 0x21: /* CTEST4 */
1269         return s->ctest4;
1270     case 0x22: /* CTEST5 */
1271         return s->ctest5;
1272     case 0x24: /* DBC[0:7] */
1273         return s->dbc & 0xff;
1274     case 0x25: /* DBC[8:15] */
1275         return (s->dbc >> 8) & 0xff;
1276     case 0x26: /* DBC[16->23] */
1277         return (s->dbc >> 16) & 0xff;
1278     case 0x27: /* DCMD */
1279         return s->dcmd;
1280     CASE_GET_REG32(dsp, 0x2c)
1281     CASE_GET_REG32(dsps, 0x30)
1282     CASE_GET_REG32(scratch[0], 0x34)
1283     case 0x38: /* DMODE */
1284         return s->dmode;
1285     case 0x39: /* DIEN */
1286         return s->dien;
1287     case 0x3b: /* DCNTL */
1288         return s->dcntl;
1289     case 0x40: /* SIEN0 */
1290         return s->sien0;
1291     case 0x41: /* SIEN1 */
1292         return s->sien1;
1293     case 0x42: /* SIST0 */
1294         tmp = s->sist0;
1295         s->sist0 = 0;
1296         lsi_update_irq(s);
1297         return tmp;
1298     case 0x43: /* SIST1 */
1299         tmp = s->sist1;
1300         s->sist1 = 0;
1301         lsi_update_irq(s);
1302         return tmp;
1303     case 0x47: /* GPCNTL0 */
1304         return 0x0f;
1305     case 0x48: /* STIME0 */
1306         return s->stime0;
1307     case 0x4a: /* RESPID0 */
1308         return s->respid0;
1309     case 0x4b: /* RESPID1 */
1310         return s->respid1;
1311     case 0x4d: /* STEST1 */
1312         return s->stest1;
1313     case 0x4e: /* STEST2 */
1314         return s->stest2;
1315     case 0x4f: /* STEST3 */
1316         return s->stest3;
1317     case 0x50: /* SIDL */
1318         /* This is needed by the linux drivers.  We currently only update it
1319            during the MSG IN phase.  */
1320         return s->sidl;
1321     case 0x52: /* STEST4 */
1322         return 0xe0;
1323     case 0x56: /* CCNTL0 */
1324         return s->ccntl0;
1325     case 0x57: /* CCNTL1 */
1326         return s->ccntl1;
1327     case 0x58: /* SBDL */
1328         /* Some drivers peek at the data bus during the MSG IN phase.  */
1329         if ((s->sstat1 & PHASE_MASK) == PHASE_MI)
1330             return s->msg[0];
1331         return 0;
1332     case 0x59: /* SBDL high */
1333         return 0;
1334     CASE_GET_REG32(mmrs, 0xa0)
1335     CASE_GET_REG32(mmws, 0xa4)
1336     CASE_GET_REG32(sfs, 0xa8)
1337     CASE_GET_REG32(drs, 0xac)
1338     CASE_GET_REG32(sbms, 0xb0)
1339     CASE_GET_REG32(dmbs, 0xb4)
1340     CASE_GET_REG32(dnad64, 0xb8)
1341     CASE_GET_REG32(pmjad1, 0xc0)
1342     CASE_GET_REG32(pmjad2, 0xc4)
1343     CASE_GET_REG32(rbc, 0xc8)
1344     CASE_GET_REG32(ua, 0xcc)
1345     CASE_GET_REG32(ia, 0xd4)
1346     CASE_GET_REG32(sbc, 0xd8)
1347     CASE_GET_REG32(csbc, 0xdc)
1348     }
1349     if (offset >= 0x5c && offset < 0xa0) {
1350         int n;
1351         int shift;
1352         n = (offset - 0x58) >> 2;
1353         shift = (offset & 3) * 8;
1354         return (s->scratch[n] >> shift) & 0xff;
1355     }
1356     BADF("readb 0x%x\n", offset);
1357     exit(1);
1358 #undef CASE_GET_REG32
1359 }
1360
1361 static void lsi_reg_writeb(LSIState *s, int offset, uint8_t val)
1362 {
1363 #define CASE_SET_REG32(name, addr) \
1364     case addr    : s->name &= 0xffffff00; s->name |= val;       break; \
1365     case addr + 1: s->name &= 0xffff00ff; s->name |= val << 8;  break; \
1366     case addr + 2: s->name &= 0xff00ffff; s->name |= val << 16; break; \
1367     case addr + 3: s->name &= 0x00ffffff; s->name |= val << 24; break;
1368
1369 #ifdef DEBUG_LSI_REG
1370     DPRINTF("Write reg %x = %02x\n", offset, val);
1371 #endif
1372     switch (offset) {
1373     case 0x00: /* SCNTL0 */
1374         s->scntl0 = val;
1375         if (val & LSI_SCNTL0_START) {
1376             BADF("Start sequence not implemented\n");
1377         }
1378         break;
1379     case 0x01: /* SCNTL1 */
1380         s->scntl1 = val & ~LSI_SCNTL1_SST;
1381         if (val & LSI_SCNTL1_IARB) {
1382             BADF("Immediate Arbritration not implemented\n");
1383         }
1384         if (val & LSI_SCNTL1_RST) {
1385             s->sstat0 |= LSI_SSTAT0_RST;
1386             lsi_script_scsi_interrupt(s, LSI_SIST0_RST, 0);
1387         } else {
1388             s->sstat0 &= ~LSI_SSTAT0_RST;
1389         }
1390         break;
1391     case 0x02: /* SCNTL2 */
1392         val &= ~(LSI_SCNTL2_WSR | LSI_SCNTL2_WSS);
1393         s->scntl2 = val;
1394         break;
1395     case 0x03: /* SCNTL3 */
1396         s->scntl3 = val;
1397         break;
1398     case 0x04: /* SCID */
1399         s->scid = val;
1400         break;
1401     case 0x05: /* SXFER */
1402         s->sxfer = val;
1403         break;
1404     case 0x06: /* SDID */
1405         if ((val & 0xf) != (s->ssid & 0xf))
1406             BADF("Destination ID does not match SSID\n");
1407         s->sdid = val & 0xf;
1408         break;
1409     case 0x07: /* GPREG0 */
1410         break;
1411     case 0x08: /* SFBR */
1412         /* The CPU is not allowed to write to this register.  However the
1413            SCRIPTS register move instructions are.  */
1414         s->sfbr = val;
1415         break;
1416     case 0x0c: case 0x0d: case 0x0e: case 0x0f:
1417         /* Linux writes to these readonly registers on startup.  */
1418         return;
1419     CASE_SET_REG32(dsa, 0x10)
1420     case 0x14: /* ISTAT0 */
1421         s->istat0 = (s->istat0 & 0x0f) | (val & 0xf0);
1422         if (val & LSI_ISTAT0_ABRT) {
1423             lsi_script_dma_interrupt(s, LSI_DSTAT_ABRT);
1424         }
1425         if (val & LSI_ISTAT0_INTF) {
1426             s->istat0 &= ~LSI_ISTAT0_INTF;
1427             lsi_update_irq(s);
1428         }
1429         if (s->waiting == 1 && val & LSI_ISTAT0_SIGP) {
1430             DPRINTF("Woken by SIGP\n");
1431             s->waiting = 0;
1432             s->dsp = s->dnad;
1433             lsi_execute_script(s);
1434         }
1435         if (val & LSI_ISTAT0_SRST) {
1436             lsi_soft_reset(s);
1437         }
1438         break;
1439     case 0x16: /* MBOX0 */
1440         s->mbox0 = val;
1441         break;
1442     case 0x17: /* MBOX1 */
1443         s->mbox1 = val;
1444         break;
1445     case 0x1b: /* CTEST3 */
1446         s->ctest3 = val & 0x0f;
1447         break;
1448     CASE_SET_REG32(temp, 0x1c)
1449     case 0x21: /* CTEST4 */
1450         if (val & 7) {
1451            BADF("Unimplemented CTEST4-FBL 0x%x\n", val);
1452         }
1453         s->ctest4 = val;
1454         break;
1455     case 0x22: /* CTEST5 */
1456         if (val & (LSI_CTEST5_ADCK | LSI_CTEST5_BBCK)) {
1457             BADF("CTEST5 DMA increment not implemented\n");
1458         }
1459         s->ctest5 = val;
1460         break;
1461     case 0x2c: /* DSP[0:7] */
1462         s->dsp &= 0xffffff00;
1463         s->dsp |= val;
1464         break;
1465     case 0x2d: /* DSP[8:15] */
1466         s->dsp &= 0xffff00ff;
1467         s->dsp |= val << 8;
1468         break;
1469     case 0x2e: /* DSP[16:23] */
1470         s->dsp &= 0xff00ffff;
1471         s->dsp |= val << 16;
1472         break;
1473     case 0x2f: /* DSP[24:31] */
1474         s->dsp &= 0x00ffffff;
1475         s->dsp |= val << 24;
1476         if ((s->dmode & LSI_DMODE_MAN) == 0
1477             && (s->istat1 & LSI_ISTAT1_SRUN) == 0)
1478             lsi_execute_script(s);
1479         break;
1480     CASE_SET_REG32(dsps, 0x30)
1481     CASE_SET_REG32(scratch[0], 0x34)
1482     case 0x38: /* DMODE */
1483         if (val & (LSI_DMODE_SIOM | LSI_DMODE_DIOM)) {
1484             BADF("IO mappings not implemented\n");
1485         }
1486         s->dmode = val;
1487         break;
1488     case 0x39: /* DIEN */
1489         s->dien = val;
1490         lsi_update_irq(s);
1491         break;
1492     case 0x3b: /* DCNTL */
1493         s->dcntl = val & ~(LSI_DCNTL_PFF | LSI_DCNTL_STD);
1494         if ((val & LSI_DCNTL_STD) && (s->istat1 & LSI_ISTAT1_SRUN) == 0)
1495             lsi_execute_script(s);
1496         break;
1497     case 0x40: /* SIEN0 */
1498         s->sien0 = val;
1499         lsi_update_irq(s);
1500         break;
1501     case 0x41: /* SIEN1 */
1502         s->sien1 = val;
1503         lsi_update_irq(s);
1504         break;
1505     case 0x47: /* GPCNTL0 */
1506         break;
1507     case 0x48: /* STIME0 */
1508         s->stime0 = val;
1509         break;
1510     case 0x49: /* STIME1 */
1511         if (val & 0xf) {
1512             DPRINTF("General purpose timer not implemented\n");
1513             /* ??? Raising the interrupt immediately seems to be sufficient
1514                to keep the FreeBSD driver happy.  */
1515             lsi_script_scsi_interrupt(s, 0, LSI_SIST1_GEN);
1516         }
1517         break;
1518     case 0x4a: /* RESPID0 */
1519         s->respid0 = val;
1520         break;
1521     case 0x4b: /* RESPID1 */
1522         s->respid1 = val;
1523         break;
1524     case 0x4d: /* STEST1 */
1525         s->stest1 = val;
1526         break;
1527     case 0x4e: /* STEST2 */
1528         if (val & 1) {
1529             BADF("Low level mode not implemented\n");
1530         }
1531         s->stest2 = val;
1532         break;
1533     case 0x4f: /* STEST3 */
1534         if (val & 0x41) {
1535             BADF("SCSI FIFO test mode not implemented\n");
1536         }
1537         s->stest3 = val;
1538         break;
1539     case 0x56: /* CCNTL0 */
1540         s->ccntl0 = val;
1541         break;
1542     case 0x57: /* CCNTL1 */
1543         s->ccntl1 = val;
1544         break;
1545     CASE_SET_REG32(mmrs, 0xa0)
1546     CASE_SET_REG32(mmws, 0xa4)
1547     CASE_SET_REG32(sfs, 0xa8)
1548     CASE_SET_REG32(drs, 0xac)
1549     CASE_SET_REG32(sbms, 0xb0)
1550     CASE_SET_REG32(dmbs, 0xb4)
1551     CASE_SET_REG32(dnad64, 0xb8)
1552     CASE_SET_REG32(pmjad1, 0xc0)
1553     CASE_SET_REG32(pmjad2, 0xc4)
1554     CASE_SET_REG32(rbc, 0xc8)
1555     CASE_SET_REG32(ua, 0xcc)
1556     CASE_SET_REG32(ia, 0xd4)
1557     CASE_SET_REG32(sbc, 0xd8)
1558     CASE_SET_REG32(csbc, 0xdc)
1559     default:
1560         if (offset >= 0x5c && offset < 0xa0) {
1561             int n;
1562             int shift;
1563             n = (offset - 0x58) >> 2;
1564             shift = (offset & 3) * 8;
1565             s->scratch[n] &= ~(0xff << shift);
1566             s->scratch[n] |= (val & 0xff) << shift;
1567         } else {
1568             BADF("Unhandled writeb 0x%x = 0x%x\n", offset, val);
1569         }
1570     }
1571 #undef CASE_SET_REG32
1572 }
1573
1574 static void lsi_mmio_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
1575 {
1576     LSIState *s = (LSIState *)opaque;
1577
1578     lsi_reg_writeb(s, addr & 0xff, val);
1579 }
1580
1581 static void lsi_mmio_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
1582 {
1583     LSIState *s = (LSIState *)opaque;
1584
1585     addr &= 0xff;
1586     lsi_reg_writeb(s, addr, val & 0xff);
1587     lsi_reg_writeb(s, addr + 1, (val >> 8) & 0xff);
1588 }
1589
1590 static void lsi_mmio_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
1591 {
1592     LSIState *s = (LSIState *)opaque;
1593
1594     addr &= 0xff;
1595     lsi_reg_writeb(s, addr, val & 0xff);
1596     lsi_reg_writeb(s, addr + 1, (val >> 8) & 0xff);
1597     lsi_reg_writeb(s, addr + 2, (val >> 16) & 0xff);
1598     lsi_reg_writeb(s, addr + 3, (val >> 24) & 0xff);
1599 }
1600
1601 static uint32_t lsi_mmio_readb(void *opaque, target_phys_addr_t addr)
1602 {
1603     LSIState *s = (LSIState *)opaque;
1604
1605     return lsi_reg_readb(s, addr & 0xff);
1606 }
1607
1608 static uint32_t lsi_mmio_readw(void *opaque, target_phys_addr_t addr)
1609 {
1610     LSIState *s = (LSIState *)opaque;
1611     uint32_t val;
1612
1613     addr &= 0xff;
1614     val = lsi_reg_readb(s, addr);
1615     val |= lsi_reg_readb(s, addr + 1) << 8;
1616     return val;
1617 }
1618
1619 static uint32_t lsi_mmio_readl(void *opaque, target_phys_addr_t addr)
1620 {
1621     LSIState *s = (LSIState *)opaque;
1622     uint32_t val;
1623     addr &= 0xff;
1624     val = lsi_reg_readb(s, addr);
1625     val |= lsi_reg_readb(s, addr + 1) << 8;
1626     val |= lsi_reg_readb(s, addr + 2) << 16;
1627     val |= lsi_reg_readb(s, addr + 3) << 24;
1628     return val;
1629 }
1630
1631 static CPUReadMemoryFunc *lsi_mmio_readfn[3] = {
1632     lsi_mmio_readb,
1633     lsi_mmio_readw,
1634     lsi_mmio_readl,
1635 };
1636
1637 static CPUWriteMemoryFunc *lsi_mmio_writefn[3] = {
1638     lsi_mmio_writeb,
1639     lsi_mmio_writew,
1640     lsi_mmio_writel,
1641 };
1642
1643 static void lsi_ram_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
1644 {
1645     LSIState *s = (LSIState *)opaque;
1646     uint32_t newval;
1647     int shift;
1648
1649     addr &= 0x1fff;
1650     newval = s->script_ram[addr >> 2];
1651     shift = (addr & 3) * 8;
1652     newval &= ~(0xff << shift);
1653     newval |= val << shift;
1654     s->script_ram[addr >> 2] = newval;
1655 }
1656
1657 static void lsi_ram_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
1658 {
1659     LSIState *s = (LSIState *)opaque;
1660     uint32_t newval;
1661
1662     addr &= 0x1fff;
1663     newval = s->script_ram[addr >> 2];
1664     if (addr & 2) {
1665         newval = (newval & 0xffff) | (val << 16);
1666     } else {
1667         newval = (newval & 0xffff0000) | val;
1668     }
1669     s->script_ram[addr >> 2] = newval;
1670 }
1671
1672
1673 static void lsi_ram_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
1674 {
1675     LSIState *s = (LSIState *)opaque;
1676
1677     addr &= 0x1fff;
1678     s->script_ram[addr >> 2] = val;
1679 }
1680
1681 static uint32_t lsi_ram_readb(void *opaque, target_phys_addr_t addr)
1682 {
1683     LSIState *s = (LSIState *)opaque;
1684     uint32_t val;
1685
1686     addr &= 0x1fff;
1687     val = s->script_ram[addr >> 2];
1688     val >>= (addr & 3) * 8;
1689     return val & 0xff;
1690 }
1691
1692 static uint32_t lsi_ram_readw(void *opaque, target_phys_addr_t addr)
1693 {
1694     LSIState *s = (LSIState *)opaque;
1695     uint32_t val;
1696
1697     addr &= 0x1fff;
1698     val = s->script_ram[addr >> 2];
1699     if (addr & 2)
1700         val >>= 16;
1701     return le16_to_cpu(val);
1702 }
1703
1704 static uint32_t lsi_ram_readl(void *opaque, target_phys_addr_t addr)
1705 {
1706     LSIState *s = (LSIState *)opaque;
1707
1708     addr &= 0x1fff;
1709     return le32_to_cpu(s->script_ram[addr >> 2]);
1710 }
1711
1712 static CPUReadMemoryFunc *lsi_ram_readfn[3] = {
1713     lsi_ram_readb,
1714     lsi_ram_readw,
1715     lsi_ram_readl,
1716 };
1717
1718 static CPUWriteMemoryFunc *lsi_ram_writefn[3] = {
1719     lsi_ram_writeb,
1720     lsi_ram_writew,
1721     lsi_ram_writel,
1722 };
1723
1724 static uint32_t lsi_io_readb(void *opaque, uint32_t addr)
1725 {
1726     LSIState *s = (LSIState *)opaque;
1727     return lsi_reg_readb(s, addr & 0xff);
1728 }
1729
1730 static uint32_t lsi_io_readw(void *opaque, uint32_t addr)
1731 {
1732     LSIState *s = (LSIState *)opaque;
1733     uint32_t val;
1734     addr &= 0xff;
1735     val = lsi_reg_readb(s, addr);
1736     val |= lsi_reg_readb(s, addr + 1) << 8;
1737     return val;
1738 }
1739
1740 static uint32_t lsi_io_readl(void *opaque, uint32_t addr)
1741 {
1742     LSIState *s = (LSIState *)opaque;
1743     uint32_t val;
1744     addr &= 0xff;
1745     val = lsi_reg_readb(s, addr);
1746     val |= lsi_reg_readb(s, addr + 1) << 8;
1747     val |= lsi_reg_readb(s, addr + 2) << 16;
1748     val |= lsi_reg_readb(s, addr + 3) << 24;
1749     return val;
1750 }
1751
1752 static void lsi_io_writeb(void *opaque, uint32_t addr, uint32_t val)
1753 {
1754     LSIState *s = (LSIState *)opaque;
1755     lsi_reg_writeb(s, addr & 0xff, val);
1756 }
1757
1758 static void lsi_io_writew(void *opaque, uint32_t addr, uint32_t val)
1759 {
1760     LSIState *s = (LSIState *)opaque;
1761     addr &= 0xff;
1762     lsi_reg_writeb(s, addr, val & 0xff);
1763     lsi_reg_writeb(s, addr + 1, (val >> 8) & 0xff);
1764 }
1765
1766 static void lsi_io_writel(void *opaque, uint32_t addr, uint32_t val)
1767 {
1768     LSIState *s = (LSIState *)opaque;
1769     addr &= 0xff;
1770     lsi_reg_writeb(s, addr, val & 0xff);
1771     lsi_reg_writeb(s, addr + 1, (val >> 8) & 0xff);
1772     lsi_reg_writeb(s, addr + 2, (val >> 16) & 0xff);
1773     lsi_reg_writeb(s, addr + 3, (val >> 24) & 0xff);
1774 }
1775
1776 static void lsi_io_mapfunc(PCIDevice *pci_dev, int region_num,
1777                            uint32_t addr, uint32_t size, int type)
1778 {
1779     LSIState *s = (LSIState *)pci_dev;
1780
1781     DPRINTF("Mapping IO at %08x\n", addr);
1782
1783     register_ioport_write(addr, 256, 1, lsi_io_writeb, s);
1784     register_ioport_read(addr, 256, 1, lsi_io_readb, s);
1785     register_ioport_write(addr, 256, 2, lsi_io_writew, s);
1786     register_ioport_read(addr, 256, 2, lsi_io_readw, s);
1787     register_ioport_write(addr, 256, 4, lsi_io_writel, s);
1788     register_ioport_read(addr, 256, 4, lsi_io_readl, s);
1789 }
1790
1791 static void lsi_ram_mapfunc(PCIDevice *pci_dev, int region_num,
1792                             uint32_t addr, uint32_t size, int type)
1793 {
1794     LSIState *s = (LSIState *)pci_dev;
1795
1796     DPRINTF("Mapping ram at %08x\n", addr);
1797     s->script_ram_base = addr;
1798     cpu_register_physical_memory(addr + 0, 0x2000, s->ram_io_addr);
1799 }
1800
1801 static void lsi_mmio_mapfunc(PCIDevice *pci_dev, int region_num,
1802                              uint32_t addr, uint32_t size, int type)
1803 {
1804     LSIState *s = (LSIState *)pci_dev;
1805
1806     DPRINTF("Mapping registers at %08x\n", addr);
1807     cpu_register_physical_memory(addr + 0, 0x400, s->mmio_io_addr);
1808 }
1809
1810 void lsi_scsi_attach(void *opaque, BlockDriverState *bd, int id)
1811 {
1812     LSIState *s = (LSIState *)opaque;
1813
1814     if (id < 0) {
1815         for (id = 0; id < LSI_MAX_DEVS; id++) {
1816             if (s->scsi_dev[id] == NULL)
1817                 break;
1818         }
1819     }
1820     if (id >= LSI_MAX_DEVS) {
1821         BADF("Bad Device ID %d\n", id);
1822         return;
1823     }
1824     if (s->scsi_dev[id]) {
1825         DPRINTF("Destroying device %d\n", id);
1826         scsi_disk_destroy(s->scsi_dev[id]);
1827     }
1828     DPRINTF("Attaching block device %d\n", id);
1829     s->scsi_dev[id] = scsi_disk_init(bd, 1, lsi_command_complete, s);
1830 }
1831
1832 void *lsi_scsi_init(PCIBus *bus, int devfn)
1833 {
1834     LSIState *s;
1835
1836     s = (LSIState *)pci_register_device(bus, "LSI53C895A SCSI HBA",
1837                                         sizeof(*s), devfn, NULL, NULL);
1838     if (s == NULL) {
1839         fprintf(stderr, "lsi-scsi: Failed to register PCI device\n");
1840         return NULL;
1841     }
1842
1843     s->pci_dev.config[0x00] = 0x00;
1844     s->pci_dev.config[0x01] = 0x10;
1845     s->pci_dev.config[0x02] = 0x12;
1846     s->pci_dev.config[0x03] = 0x00;
1847     s->pci_dev.config[0x0b] = 0x01;
1848     s->pci_dev.config[0x3d] = 0x01; /* interrupt pin 1 */
1849
1850     s->mmio_io_addr = cpu_register_io_memory(0, lsi_mmio_readfn,
1851                                              lsi_mmio_writefn, s);
1852     s->ram_io_addr = cpu_register_io_memory(0, lsi_ram_readfn,
1853                                             lsi_ram_writefn, s);
1854
1855     pci_register_io_region((struct PCIDevice *)s, 0, 256,
1856                            PCI_ADDRESS_SPACE_IO, lsi_io_mapfunc);
1857     pci_register_io_region((struct PCIDevice *)s, 1, 0x400,
1858                            PCI_ADDRESS_SPACE_MEM, lsi_mmio_mapfunc);
1859     pci_register_io_region((struct PCIDevice *)s, 2, 0x2000,
1860                            PCI_ADDRESS_SPACE_MEM, lsi_ram_mapfunc);
1861     s->queue = qemu_malloc(sizeof(lsi_queue));
1862     s->queue_len = 1;
1863     s->active_commands = 0;
1864
1865     lsi_soft_reset(s);
1866
1867     return s;
1868 }
1869