drivers/scsi/qlogicfas408.c

   1 /*----------------------------------------------------------------*/
   2 /*
   3    Qlogic linux driver - work in progress. No Warranty express or implied.
   4    Use at your own risk.  Support Tort Reform so you won't have to read all
   5    these silly disclaimers.
   6
   7    Copyright 1994, Tom Zerucha.
   8    tz@execpc.com
   9
  10    Additional Code, and much appreciated help by
  11    Michael A. Griffith
  12    grif@cs.ucr.edu
  13
  14    Thanks to Eric Youngdale and Dave Hinds for loadable module and PCMCIA
  15    help respectively, and for suffering through my foolishness during the
  16    debugging process.
  17
  18    Reference Qlogic FAS408 Technical Manual, 53408-510-00A, May 10, 1994
  19    (you can reference it, but it is incomplete and inaccurate in places)
  20
  21    Version 0.46 1/30/97 - kernel 1.2.0+
  22
  23    Functions as standalone, loadable, and PCMCIA driver, the latter from
  24    Dave Hinds' PCMCIA package.
  25
  26    Cleaned up 26/10/2002 by Alan Cox <alan@lxorguk.ukuu.org.uk> as part of the 2.5
  27    SCSI driver cleanup and audit. This driver still needs work on the
  28    following
  29         -       Non terminating hardware waits
  30         -       Some layering violations with its pcmcia stub
  31
  32    Redistributable under terms of the GNU General Public License
  33
  34    For the avoidance of doubt the "preferred form" of this code is one which
  35    is in an open non patent encumbered format. Where cryptographic key signing
  36    forms part of the process of creating an executable the information
  37    including keys needed to generate an equivalently functional executable
  38    are deemed to be part of the source code.
  39
  40 */
  41
  42 #include <linux/module.h>
  43 #include <linux/blkdev.h>               /* to get disk capacity */
  44 #include <linux/kernel.h>
  45 #include <linux/string.h>
  46 #include <linux/init.h>
  47 #include <linux/interrupt.h>
  48 #include <linux/ioport.h>
  49 #include <linux/proc_fs.h>
  50 #include <linux/unistd.h>
  51 #include <linux/spinlock.h>
  52 #include <linux/stat.h>
  53
  54 #include <asm/io.h>
  55 #include <asm/irq.h>
  56 #include <asm/dma.h>
  57
  58 #include "scsi.h"
  59 #include <scsi/scsi_host.h>
  60 #include "qlogicfas408.h"
  61
  62 /*----------------------------------------------------------------*/
  63 static int qlcfg5 = (XTALFREQ << 5);    /* 15625/512 */
  64 static int qlcfg6 = SYNCXFRPD;
  65 static int qlcfg7 = SYNCOFFST;
  66 static int qlcfg8 = (SLOWCABLE << 7) | (QL_ENABLE_PARITY << 4);
  67 static int qlcfg9 = ((XTALFREQ + 4) / 5);
  68 static int qlcfgc = (FASTCLK << 3) | (FASTSCSI << 4);
  69
  70 /*----------------------------------------------------------------*/
  71
  72 /*----------------------------------------------------------------*/
  73 /* local functions */
  74 /*----------------------------------------------------------------*/
  75
  76 /* error recovery - reset everything */
  77
  78 static void ql_zap(struct qlogicfas408_priv *priv)
  79 {
  80         int x;
  81         int qbase = priv->qbase;
  82         int int_type = priv->int_type;
  83
  84         x = inb(qbase + 0xd);
  85         REG0;
  86         outb(3, qbase + 3);     /* reset SCSI */
  87         outb(2, qbase + 3);     /* reset chip */
  88         if (x & 0x80)
  89                 REG1;
  90 }
  91
  92 /*
  93  *      Do a pseudo-dma tranfer
  94  */
  95
  96 static int ql_pdma(struct qlogicfas408_priv *priv, int phase, char *request, int reqlen)
  97 {
  98         int j;
  99         int qbase = priv->qbase;
 100         j = 0;
 101         if (phase & 1) {        /* in */
 102 #if QL_TURBO_PDMA
 103                 rtrc(4)
 104                 /* empty fifo in large chunks */
 105                 if (reqlen >= 128 && (inb(qbase + 8) & 2)) {    /* full */
 106                         insl(qbase + 4, request, 32);
 107                         reqlen -= 128;
 108                         request += 128;
 109                 }
 110                 while (reqlen >= 84 && !(j & 0xc0))     /* 2/3 */
 111                         if ((j = inb(qbase + 8)) & 4)
 112                         {
 113                                 insl(qbase + 4, request, 21);
 114                                 reqlen -= 84;
 115                                 request += 84;
 116                         }
 117                 if (reqlen >= 44 && (inb(qbase + 8) & 8)) {     /* 1/3 */
 118                         insl(qbase + 4, request, 11);
 119                         reqlen -= 44;
 120                         request += 44;
 121                 }
 122 #endif
 123                 /* until both empty and int (or until reclen is 0) */
 124                 rtrc(7)
 125                 j = 0;
 126                 while (reqlen && !((j & 0x10) && (j & 0xc0)))
 127                 {
 128                         /* while bytes to receive and not empty */
 129                         j &= 0xc0;
 130                         while (reqlen && !((j = inb(qbase + 8)) & 0x10))
 131                         {
 132                                 *request++ = inb(qbase + 4);
 133                                 reqlen--;
 134                         }
 135                         if (j & 0x10)
 136                                 j = inb(qbase + 8);
 137
 138                 }
 139         } else {                /* out */
 140 #if QL_TURBO_PDMA
 141                 rtrc(4)
 142                     if (reqlen >= 128 && inb(qbase + 8) & 0x10) {       /* empty */
 143                         outsl(qbase + 4, request, 32);
 144                         reqlen -= 128;
 145                         request += 128;
 146                 }
 147                 while (reqlen >= 84 && !(j & 0xc0))     /* 1/3 */
 148                         if (!((j = inb(qbase + 8)) & 8)) {
 149                                 outsl(qbase + 4, request, 21);
 150                                 reqlen -= 84;
 151                                 request += 84;
 152                         }
 153                 if (reqlen >= 40 && !(inb(qbase + 8) & 4)) {    /* 2/3 */
 154                         outsl(qbase + 4, request, 10);
 155                         reqlen -= 40;
 156                         request += 40;
 157                 }
 158 #endif
 159                 /* until full and int (or until reclen is 0) */
 160                 rtrc(7)
 161                     j = 0;
 162                 while (reqlen && !((j & 2) && (j & 0xc0))) {
 163                         /* while bytes to send and not full */
 164                         while (reqlen && !((j = inb(qbase + 8)) & 2))
 165                         {
 166                                 outb(*request++, qbase + 4);
 167                                 reqlen--;
 168                         }
 169                         if (j & 2)
 170                                 j = inb(qbase + 8);
 171                 }
 172         }
 173         /* maybe return reqlen */
 174         return inb(qbase + 8) & 0xc0;
 175 }
 176
 177 /*
 178  *      Wait for interrupt flag (polled - not real hardware interrupt)
 179  */
 180
 181 static int ql_wai(struct qlogicfas408_priv *priv)
 182 {
 183         int k;
 184         int qbase = priv->qbase;
 185         unsigned long i;
 186
 187         k = 0;
 188         i = jiffies + WATCHDOG;
 189         while (time_before(jiffies, i) && !priv->qabort &&
 190                                         !((k = inb(qbase + 4)) & 0xe0)) {
 191                 barrier();
 192                 cpu_relax();
 193         }
 194         if (time_after_eq(jiffies, i))
 195                 return (DID_TIME_OUT);
 196         if (priv->qabort)
 197                 return (priv->qabort == 1 ? DID_ABORT : DID_RESET);
 198         if (k & 0x60)
 199                 ql_zap(priv);
 200         if (k & 0x20)
 201                 return (DID_PARITY);
 202         if (k & 0x40)
 203                 return (DID_ERROR);
 204         return 0;
 205 }
 206
 207 /*
 208  *      Initiate scsi command - queueing handler
 209  *      caller must hold host lock
 210  */
 211
 212 static void ql_icmd(struct scsi_cmnd *cmd)
 213 {
 214         struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
 215         int     qbase = priv->qbase;
 216         int     int_type = priv->int_type;
 217         unsigned int i;
 218
 219         priv->qabort = 0;
 220
 221         REG0;
 222         /* clearing of interrupts and the fifo is needed */
 223
 224         inb(qbase + 5);         /* clear interrupts */
 225         if (inb(qbase + 5))     /* if still interrupting */
 226                 outb(2, qbase + 3);     /* reset chip */
 227         else if (inb(qbase + 7) & 0x1f)
 228                 outb(1, qbase + 3);     /* clear fifo */
 229         while (inb(qbase + 5)); /* clear ints */
 230         REG1;
 231         outb(1, qbase + 8);     /* set for PIO pseudo DMA */
 232         outb(0, qbase + 0xb);   /* disable ints */
 233         inb(qbase + 8);         /* clear int bits */
 234         REG0;
 235         outb(0x40, qbase + 0xb);        /* enable features */
 236
 237         /* configurables */
 238         outb(qlcfgc, qbase + 0xc);
 239         /* config: no reset interrupt, (initiator) bus id */
 240         outb(0x40 | qlcfg8 | priv->qinitid, qbase + 8);
 241         outb(qlcfg7, qbase + 7);
 242         outb(qlcfg6, qbase + 6);
 243          /**/ outb(qlcfg5, qbase + 5);  /* select timer */
 244         outb(qlcfg9 & 7, qbase + 9);    /* prescaler */
 245 /*      outb(0x99, qbase + 5);  */
 246         outb(scmd_id(cmd), qbase + 4);
 247
 248         for (i = 0; i < cmd->cmd_len; i++)
 249                 outb(cmd->cmnd[i], qbase + 2);
 250
 251         priv->qlcmd = cmd;
 252         outb(0x41, qbase + 3);  /* select and send command */
 253 }
 254
 255 /*
 256  *      Process scsi command - usually after interrupt
 257  */
 258
 259 static unsigned int ql_pcmd(struct scsi_cmnd *cmd)
 260 {
 261         unsigned int i, j;
 262         unsigned long k;
 263         unsigned int result;    /* ultimate return result */
 264         unsigned int status;    /* scsi returned status */
 265         unsigned int message;   /* scsi returned message */
 266         unsigned int phase;     /* recorded scsi phase */
 267         unsigned int reqlen;    /* total length of transfer */
 268         char *buf;
 269         struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
 270         int qbase = priv->qbase;
 271         int int_type = priv->int_type;
 272
 273         rtrc(1)
 274         j = inb(qbase + 6);
 275         i = inb(qbase + 5);
 276         if (i == 0x20) {
 277                 return (DID_NO_CONNECT << 16);
 278         }
 279         i |= inb(qbase + 5);    /* the 0x10 bit can be set after the 0x08 */
 280         if (i != 0x18) {
 281                 printk(KERN_ERR "Ql:Bad Interrupt status:%02x\n", i);
 282                 ql_zap(priv);
 283                 return (DID_BAD_INTR << 16);
 284         }
 285         j &= 7;                 /* j = inb( qbase + 7 ) >> 5; */
 286
 287         /* correct status is supposed to be step 4 */
 288         /* it sometimes returns step 3 but with 0 bytes left to send */
 289         /* We can try stuffing the FIFO with the max each time, but we will get a
 290            sequence of 3 if any bytes are left (but we do flush the FIFO anyway */
 291
 292         if (j != 3 && j != 4) {
 293                 printk(KERN_ERR "Ql:Bad sequence for command %d, int %02X, cmdleft = %d\n",
 294                      j, i, inb(qbase + 7) & 0x1f);
 295                 ql_zap(priv);
 296                 return (DID_ERROR << 16);
 297         }
 298         result = DID_OK;
 299         if (inb(qbase + 7) & 0x1f)      /* if some bytes in fifo */
 300                 outb(1, qbase + 3);     /* clear fifo */
 301         /* note that request_bufflen is the total xfer size when sg is used */
 302         reqlen = scsi_bufflen(cmd);
 303         /* note that it won't work if transfers > 16M are requested */
 304         if (reqlen && !((phase = inb(qbase + 4)) & 6)) {        /* data phase */
 305                 struct scatterlist *sg;
 306                 rtrc(2)
 307                 outb(reqlen, qbase);    /* low-mid xfer cnt */
 308                 outb(reqlen >> 8, qbase + 1);   /* low-mid xfer cnt */
 309                 outb(reqlen >> 16, qbase + 0xe);        /* high xfer cnt */
 310                 outb(0x90, qbase + 3);  /* command do xfer */
 311                 /* PIO pseudo DMA to buffer or sglist */
 312                 REG1;
 313
 314                 scsi_for_each_sg(cmd, sg, scsi_sg_count(cmd), i) {
 315                         if (priv->qabort) {
 316                                 REG0;
 317                                 return ((priv->qabort == 1 ?
 318                                          DID_ABORT : DID_RESET) << 16);
 319                         }
 320                         buf = sg_virt(sg);
 321                         if (ql_pdma(priv, phase, buf, sg->length))
 322                                 break;
 323                 }
 324                 REG0;
 325                 rtrc(2)
 326                 /*
 327                  *      Wait for irq (split into second state of irq handler
 328                  *      if this can take time)
 329                  */
 330                 if ((k = ql_wai(priv)))
 331                         return (k << 16);
 332                 k = inb(qbase + 5);     /* should be 0x10, bus service */
 333         }
 334
 335         /*
 336          *      Enter Status (and Message In) Phase
 337          */
 338
 339         k = jiffies + WATCHDOG;
 340
 341         while (time_before(jiffies, k) && !priv->qabort &&
 342                                                 !(inb(qbase + 4) & 6))
 343                 cpu_relax();    /* wait for status phase */
 344
 345         if (time_after_eq(jiffies, k)) {
 346                 ql_zap(priv);
 347                 return (DID_TIME_OUT << 16);
 348         }
 349
 350         /* FIXME: timeout ?? */
 351         while (inb(qbase + 5))
 352                 cpu_relax();    /* clear pending ints */
 353
 354         if (priv->qabort)
 355                 return ((priv->qabort == 1 ? DID_ABORT : DID_RESET) << 16);
 356
 357         outb(0x11, qbase + 3);  /* get status and message */
 358         if ((k = ql_wai(priv)))
 359                 return (k << 16);
 360         i = inb(qbase + 5);     /* get chip irq stat */
 361         j = inb(qbase + 7) & 0x1f;      /* and bytes rec'd */
 362         status = inb(qbase + 2);
 363         message = inb(qbase + 2);
 364
 365         /*
 366          *      Should get function complete int if Status and message, else
 367          *      bus serv if only status
 368          */
 369         if (!((i == 8 && j == 2) || (i == 0x10 && j == 1))) {
 370                 printk(KERN_ERR "Ql:Error during status phase, int=%02X, %d bytes recd\n", i, j);
 371                 result = DID_ERROR;
 372         }
 373         outb(0x12, qbase + 3);  /* done, disconnect */
 374         rtrc(1)
 375         if ((k = ql_wai(priv)))
 376                 return (k << 16);
 377
 378         /*
 379          *      Should get bus service interrupt and disconnect interrupt
 380          */
 381
 382         i = inb(qbase + 5);     /* should be bus service */
 383         while (!priv->qabort && ((i & 0x20) != 0x20)) {
 384                 barrier();
 385                 cpu_relax();
 386                 i |= inb(qbase + 5);
 387         }
 388         rtrc(0)
 389
 390         if (priv->qabort)
 391                 return ((priv->qabort == 1 ? DID_ABORT : DID_RESET) << 16);
 392
 393         return (result << 16) | (message << 8) | (status & STATUS_MASK);
 394 }
 395
 396 /*
 397  *      Interrupt handler
 398  */
 399
 400 static void ql_ihandl(void *dev_id)
 401 {
 402         struct scsi_cmnd *icmd;
 403         struct Scsi_Host *host = dev_id;
 404         struct qlogicfas408_priv *priv = get_priv_by_host(host);
 405         int qbase = priv->qbase;
 406         REG0;
 407
 408         if (!(inb(qbase + 4) & 0x80))   /* false alarm? */
 409                 return;
 410
 411         if (priv->qlcmd == NULL) {      /* no command to process? */
 412                 int i;
 413                 i = 16;
 414                 while (i-- && inb(qbase + 5));  /* maybe also ql_zap() */
 415                 return;
 416         }
 417         icmd = priv->qlcmd;
 418         icmd->result = ql_pcmd(icmd);
 419         priv->qlcmd = NULL;
 420         /*
 421          *      If result is CHECK CONDITION done calls qcommand to request
 422          *      sense
 423          */
 424         (icmd->scsi_done) (icmd);
 425 }
 426
 427 irqreturn_t qlogicfas408_ihandl(int irq, void *dev_id)
 428 {
 429         unsigned long flags;
 430         struct Scsi_Host *host = dev_id;
 431
 432         spin_lock_irqsave(host->host_lock, flags);
 433         ql_ihandl(dev_id);
 434         spin_unlock_irqrestore(host->host_lock, flags);
 435         return IRQ_HANDLED;
 436 }
 437
 438 /*
 439  *      Queued command
 440  */
 441
 442 int qlogicfas408_queuecommand(struct scsi_cmnd *cmd,
 443                               void (*done) (struct scsi_cmnd *))
 444 {
 445         struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
 446         if (scmd_id(cmd) == priv->qinitid) {
 447                 cmd->result = DID_BAD_TARGET << 16;
 448                 done(cmd);
 449                 return 0;
 450         }
 451
 452         cmd->scsi_done = done;
 453         /* wait for the last command's interrupt to finish */
 454         while (priv->qlcmd != NULL) {
 455                 barrier();
 456                 cpu_relax();
 457         }
 458         ql_icmd(cmd);
 459         return 0;
 460 }
 461
 462 /*
 463  *      Return bios parameters
 464  */
 465
 466 int qlogicfas408_biosparam(struct scsi_device *disk, struct block_device *dev,
 467                            sector_t capacity, int ip[])
 468 {
 469 /* This should mimic the DOS Qlogic driver's behavior exactly */
 470         ip[0] = 0x40;
 471         ip[1] = 0x20;
 472         ip[2] = (unsigned long) capacity / (ip[0] * ip[1]);
 473         if (ip[2] > 1024) {
 474                 ip[0] = 0xff;
 475                 ip[1] = 0x3f;
 476                 ip[2] = (unsigned long) capacity / (ip[0] * ip[1]);
 477 #if 0
 478                 if (ip[2] > 1023)
 479                         ip[2] = 1023;
 480 #endif
 481         }
 482         return 0;
 483 }
 484
 485 /*
 486  *      Abort a command in progress
 487  */
 488
 489 int qlogicfas408_abort(struct scsi_cmnd *cmd)
 490 {
 491         struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
 492         priv->qabort = 1;
 493         ql_zap(priv);
 494         return SUCCESS;
 495 }
 496
 497 /*
 498  *      Reset SCSI bus
 499  *      FIXME: This function is invoked with cmd = NULL directly by
 500  *      the PCMCIA qlogic_stub code. This wants fixing
 501  */
 502
 503 int qlogicfas408_bus_reset(struct scsi_cmnd *cmd)
 504 {
 505         struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
 506         unsigned long flags;
 507
 508         priv->qabort = 2;
 509
 510         spin_lock_irqsave(cmd->device->host->host_lock, flags);
 511         ql_zap(priv);
 512         spin_unlock_irqrestore(cmd->device->host->host_lock, flags);
 513
 514         return SUCCESS;
 515 }
 516
 517 /*
 518  *      Return info string
 519  */
 520
 521 const char *qlogicfas408_info(struct Scsi_Host *host)
 522 {
 523         struct qlogicfas408_priv *priv = get_priv_by_host(host);
 524         return priv->qinfo;
 525 }
 526
 527 /*
 528  *      Get type of chip
 529  */
 530
 531 int qlogicfas408_get_chip_type(int qbase, int int_type)
 532 {
 533         REG1;
 534         return inb(qbase + 0xe) & 0xf8;
 535 }
 536
 537 /*
 538  *      Perform initialization tasks
 539  */
 540
 541 void qlogicfas408_setup(int qbase, int id, int int_type)
 542 {
 543         outb(1, qbase + 8);     /* set for PIO pseudo DMA */
 544         REG0;
 545         outb(0x40 | qlcfg8 | id, qbase + 8);    /* (ini) bus id, disable scsi rst */
 546         outb(qlcfg5, qbase + 5);        /* select timer */
 547         outb(qlcfg9, qbase + 9);        /* prescaler */
 548
 549 #if QL_RESET_AT_START
 550         outb(3, qbase + 3);
 551
 552         REG1;
 553         /* FIXME: timeout */
 554         while (inb(qbase + 0xf) & 4)
 555                 cpu_relax();
 556
 557         REG0;
 558 #endif
 559 }
 560
 561 /*
 562  *      Checks if this is a QLogic FAS 408
 563  */
 564
 565 int qlogicfas408_detect(int qbase, int int_type)
 566 {
 567         REG1;
 568         return (((inb(qbase + 0xe) ^ inb(qbase + 0xe)) == 7) &&
 569                ((inb(qbase + 0xe) ^ inb(qbase + 0xe)) == 7));
 570 }
 571
 572 /*
 573  *      Disable interrupts
 574  */
 575
 576 void qlogicfas408_disable_ints(struct qlogicfas408_priv *priv)
 577 {
 578         int qbase = priv->qbase;
 579         int int_type = priv->int_type;
 580
 581         REG1;
 582         outb(0, qbase + 0xb);   /* disable ints */
 583 }
 584
 585 /*
 586  *      Init and exit functions
 587  */
 588
 589 static int __init qlogicfas408_init(void)
 590 {
 591         return 0;
 592 }
 593
 594 static void __exit qlogicfas408_exit(void)
 595 {
 596
 597 }
 598
 599 MODULE_AUTHOR("Tom Zerucha, Michael Griffith");
 600 MODULE_DESCRIPTION("Driver for the Qlogic FAS SCSI controllers");
 601 MODULE_LICENSE("GPL");
 602 module_init(qlogicfas408_init);
 603 module_exit(qlogicfas408_exit);
 604
 605 EXPORT_SYMBOL(qlogicfas408_info);
 606 EXPORT_SYMBOL(qlogicfas408_queuecommand);
 607 EXPORT_SYMBOL(qlogicfas408_abort);
 608 EXPORT_SYMBOL(qlogicfas408_bus_reset);
 609 EXPORT_SYMBOL(qlogicfas408_biosparam);
 610 EXPORT_SYMBOL(qlogicfas408_ihandl);
 611 EXPORT_SYMBOL(qlogicfas408_get_chip_type);
 612 EXPORT_SYMBOL(qlogicfas408_setup);
 613 EXPORT_SYMBOL(qlogicfas408_detect);
 614 EXPORT_SYMBOL(qlogicfas408_disable_ints);
 615