drivers/scsi/aic7xxx.c

/* */
This source file includes following definitions.
debug
debug_config
debug_scb
aic7xxx_setup
aic7xxx_loadseq
aic7xxx_delay
rcs_version
aic7xxx_info
aic7xxx_length
aic7xxx_scsirate
aic7xxx_putscb
aic7xxx_getscb
aic7xxx_match_scb
aic7xxx_busy_target
aic7xxx_unbusy_target
aic7xxx_done
aic7xxx_add_waiting_scb
aic7xxx_abort_waiting_scb
aic7xxx_reset_device
aic7xxx_reset_current_bus
aic7xxx_reset_channel
aic7xxx_isr
aic7xxx_probe
read_2840_seeprom
read_seeprom
detect_maxscb
aic7xxx_register
aic7xxx_detect
aic7xxx_buildscb
aic7xxx_queue
aic7xxx_abort_scb
aic7xxx_abort_reset
aic7xxx_abort
aic7xxx_reset
aic7xxx_biosparam
   1 /*+M*************************************************************************
   2  * Adaptec AIC7xxx device driver for Linux.
   3  *
   4  * Copyright (c) 1994 John Aycock
   5  *   The University of Calgary Department of Computer Science.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; see the file COPYING.  If not, write to
  19  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  22  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  23  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  24  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  25  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  26  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  27  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  28  * ANSI SCSI-2 specification (draft 10c), ...
  29  *
  30  * ----------------------------------------------------------------
  31  *  Modified to include support for wide and twin bus adapters,
  32  *  DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  33  *  and other rework of the code.
  34  *
  35  *  Parts of this driver are based on the FreeBSD driver by Justin
  36  *  T. Gibbs.
  37  *
  38  *  A Boot time option was also added for not resetting the scsi bus.
  39  *
  40  *    Form:  aic7xxx=extended,no_reset
  41  *
  42  *    -- Daniel M. Eischen, deischen@iworks.InterWorks.org, 04/03/95
  43  *
  44  *  $Id: aic7xxx.c,v 2.22 1996/02/10 09:22:50 deang Exp deang $
  45  *-M*************************************************************************/
  46 
  47 #ifdef MODULE
  48 #include <linux/module.h>
  49 #endif
  50 
  51 #include <stdarg.h>
  52 #include <asm/io.h>
  53 #include <linux/string.h>
  54 #include <linux/errno.h>
  55 #include <linux/kernel.h>
  56 #include <linux/ioport.h>
  57 #include <linux/bios32.h>
  58 #include <linux/delay.h>
  59 #include <linux/sched.h>
  60 #include <linux/pci.h>
  61 #include <linux/proc_fs.h>
  62 #include <linux/blk.h>
  63 #include "sd.h"
  64 #include "scsi.h"
  65 #include "hosts.h"
  66 #include "aic7xxx.h"
  67 #include "aic7xxx_reg.h"
  68 #include <linux/stat.h>
  69 
  70 #include <linux/config.h>       /* for CONFIG_PCI */
  71 
  72 struct proc_dir_entry proc_scsi_aic7xxx = {
  73     PROC_SCSI_AIC7XXX, 7, "aic7xxx",
  74     S_IFDIR | S_IRUGO | S_IXUGO, 2
  75 };
  76 
  77 #define AIC7XXX_C_VERSION  "$Revision: 2.22 $"
  78 
  79 #define NUMBER(arr)     (sizeof(arr) / sizeof(arr[0]))
  80 #define MIN(a,b)        ((a < b) ? a : b)
  81 #define ALL_TARGETS -1
  82 #ifndef TRUE
  83 #  define TRUE 1
  84 #endif
  85 #ifndef FALSE
  86 #  define FALSE 0
  87 #endif
  88 
  89 /*
  90  * Defines for PCI bus support, testing twin bus support, DMAing of
  91  * SCBs, tagged queueing, commands (SCBs) per lun, and SCSI bus reset
  92  * delay time.
  93  *
  94  *   o PCI bus support - this has been implemented and working since
  95  *     the December 1, 1994 release of this driver. If you don't have
  96  *     a PCI bus, then you can configure your kernel without PCI
  97  *     support because all PCI dependent code is bracketed with
  98  *     "#ifdef CONFIG_PCI ... #endif CONFIG_PCI".
  99  *
 100  *   o Twin bus support - this has been tested and does work.
 101  *
 102  *   o DMAing of SCBs - thanks to Kai Makisara, this now works.
 103  *     This define is now taken out and DMAing of SCBs is always
 104  *     performed (8/12/95 - DE).
 105  *
 106  *   o Tagged queueing - this driver is capable of tagged queueing
 107  *     but I am unsure as to how well the higher level driver implements
 108  *     tagged queueing. Therefore, the maximum commands per lun is
 109  *     set to 2. If you want to implement tagged queueing, ensure
 110  *     this define is not commented out.
 111  *
 112  *   o Sharing IRQs - allowed for sharing of IRQs. This will allow
 113  *     for multiple aic7xxx host adapters sharing the same IRQ, but
 114  *     not for sharing IRQs with other devices. The higher level
 115  *     PCI code and interrupt handling needs to be modified to
 116  *     support this.
 117  *
 118  *   o Commands per lun - If tagged queueing is enabled, then you
 119  *     may want to try increasing AIC7XXX_CMDS_PER_LUN to more
 120  *     than 2.  By default, we limit the SCBs per lun to 2 with
 121  *     or without tagged queueing enabled.  If tagged queueing is
 122  *     disabled, the sequencer will keep the 2nd SCB in the input
 123  *     queue until the first one completes - so it is OK to to have
 124  *     more than 1 SCB queued.  If tagged queueing is enabled, then
 125  *     the sequencer will attempt to send the 2nd SCB to the device
 126  *     while the first SCB is executing and the device is disconnected.
 127  *     For adapters limited to 4 SCBs, you may want to actually
 128  *     decrease the commands per lun to 1, if you often have more
 129  *     than 2 devices active at the same time.  This will allocate
 130  *     1 SCB for each device and ensure that there will always be
 131  *     a free SCB for up to 4 devices active at the same time.
 132  *
 133  *   o 3985 support - The 3985 adapter is much like the 3940, but
 134  *     has three 7870 controllers as opposed to two for the 3940.
 135  *     It will get probed and recognized as three different adapters,
 136  *     but all three controllers share the same bank of 255 SCBs
 137  *     instead of each controller having their own bank (like the
 138  *     controllers on the 3940).  For this reason, it is important
 139  *     that all devices be resident on just one channel of the 3985.
 140  *     In the near future, we'll modify the driver to reserve 1/3
 141  *     of the SCBs for each controller.
 142  *
 143  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 01/11/96
 144  */
 145 
 146 /* Uncomment this for testing twin bus support. */
 147 #define AIC7XXX_TWIN_SUPPORT
 148 
 149 /* Uncomment this for tagged queueing. */
 150 /* #define AIC7XXX_TAGGED_QUEUEING */
 151 
 152 /* Uncomment this for allowing sharing of IRQs. */
 153 #define AIC7XXX_SHARE_IRQS
 154 
 155 /*
 156  * You can try raising me if tagged queueing is enabled, or lowering
 157  * me if you only have 4 SCBs.
 158  */
 159 #define AIC7XXX_CMDS_PER_LUN 2
 160 
 161 /* Set this to the delay in seconds after SCSI bus reset. */
 162 #define AIC7XXX_RESET_DELAY 15
 163 
 164 /*
 165  * Uncomment the following define for collection of SCSI transfer statistics
 166  * for the /proc filesystem.
 167  *
 168  * NOTE: This does affect performance since it has to maintain statistics.
 169  */
 170 /* #define AIC7XXX_PROC_STATS */
 171 
 172 /*
 173  * For debugging the abort/reset code.
 174  */
 175 /* #define AIC7XXX_DEBUG_ABORT */
 176 
 177 /*
 178  * For general debug messages
 179  */
 180 #define AIC7XXX_DEBUG
 181 
 182 /*
 183  * Controller type and options
 184  */
 185 typedef enum {
 186   AIC_NONE,
 187   AIC_7770,     /* EISA aic7770 on motherboard */
 188   AIC_7771,     /* EISA aic7771 on 274x */
 189   AIC_284x,     /* VLB  aic7770 on 284x */
 190   AIC_7850,     /* PCI  aic7850 */
 191   AIC_7870,     /* PCI  aic7870 on motherboard */
 192   AIC_7871,     /* PCI  aic7871 on 294x */
 193   AIC_7872,     /* PCI  aic7872 on 3940 */
 194   AIC_7873,     /* PCI  aic7873 on 3985 */
 195   AIC_7874,     /* PCI  aic7874 on 294x Differential */
 196   AIC_7880,     /* PCI  aic7880 on motherboard */
 197   AIC_7881,     /* PCI  aic7881 on 294x Ultra */
 198   AIC_7882,     /* PCI  aic7882 on 3940 Ultra */
 199   AIC_7883,     /* PCI  aic7883 on 3985 Ultra */
 200   AIC_7884      /* PCI  aic7884 on 294x Ultra Differential */
 201 } aha_type;
 202 
 203 typedef enum {
 204   AIC_777x,     /* AIC-7770 based */
 205   AIC_785x,     /* AIC-7850 based */
 206   AIC_787x,     /* AIC-7870 based */
 207   AIC_788x      /* AIC-7880 based */
 208 } aha_chip_type;
 209 
 210 typedef enum {
 211   AIC_SINGLE,  /* Single Channel */
 212   AIC_TWIN,    /* Twin Channel */
 213   AIC_WIDE     /* Wide Channel */
 214 } aha_bus_type;
 215 
 216 typedef enum {
 217   AIC_UNKNOWN,
 218   AIC_ENABLED,
 219   AIC_DISABLED
 220 } aha_status_type;
 221 
 222 typedef enum {
 223   LIST_HEAD,
 224   LIST_SECOND
 225 } insert_type;
 226 
 227 typedef enum {
 228   ABORT_RESET_INACTIVE,
 229   ABORT_RESET_PENDING,
 230   ABORT_RESET_SUCCESS
 231 } aha_abort_reset_type;
 232 
 233 /*
 234  * Define an array of board names that can be indexed by aha_type.
 235  * Don't forget to change this when changing the types!
 236  */
 237 static const char * board_names[] = {
 238   "<AIC-7xxx Unknown>",         /* AIC_NONE */
 239   "AIC-7770",                   /* AIC_7770 */
 240   "AHA-2740",                   /* AIC_7771 */
 241   "AHA-2840",                   /* AIC_284x */
 242   "AIC-7850",                   /* AIC_7850 */
 243   "AIC-7870",                   /* AIC_7870 */
 244   "AHA-2940",                   /* AIC_7871 */
 245   "AHA-3940",                   /* AIC_7872 */
 246   "AHA-3985",                   /* AIC_7873 */
 247   "AHA-2940 Differential",      /* AIC_7874 */
 248   "AIC-7880 Ultra",             /* AIC_7880 */
 249   "AHA-2940 Ultra",             /* AIC_7881 */
 250   "AHA-3940 Ultra",             /* AIC_7882 */
 251   "AHA-3985 Ultra",             /* AIC_7883 */
 252   "AHA-2940 Ultra Differential" /* AIC_7884 */
 253 };
 254 
 255 /*
 256  * There should be a specific return value for this in scsi.h, but
 257  * it seems that most drivers ignore it.
 258  */
 259 #define DID_UNDERFLOW   DID_ERROR
 260 
 261 /*
 262  *  What we want to do is have the higher level scsi driver requeue
 263  *  the command to us. There is no specific driver status for this
 264  *  condition, but the higher level scsi driver will requeue the
 265  *  command on a DID_BUS_BUSY error.
 266  */
 267 #define DID_RETRY_COMMAND DID_BUS_BUSY
 268 
 269 /*
 270  * EISA/VL-bus stuff
 271  */
 272 #define MINSLOT         1
 273 #define MAXSLOT         15
 274 #define SLOTBASE(x)     ((x) << 12)
 275 #define MAXIRQ          15
 276 
 277 /*
 278  * Standard EISA Host ID regs  (Offset from slot base)
 279  */
 280 #define HID0            0x80   /* 0,1: msb of ID2, 2-7: ID1      */
 281 #define HID1            0x81   /* 0-4: ID3, 5-7: LSB ID2         */
 282 #define HID2            0x82   /* product                        */
 283 #define HID3            0x83   /* firmware revision              */
 284 
 285 /*
 286  * AIC-7770 I/O range to reserve for a card
 287  */
 288 #define MINREG          0xC00
 289 #define MAXREG          0xCBF
 290 
 291 #define INTDEF          0x5C            /* Interrupt Definition Register */
 292 
 293 /*
 294  * Some defines for the HCNTRL register.
 295  */
 296 #define REQ_PAUSE       IRQMS | INTEN | PAUSE
 297 #define UNPAUSE_274X    IRQMS | INTEN
 298 #define UNPAUSE_284X    INTEN
 299 #define UNPAUSE_294X    IRQMS | INTEN
 300 
 301 /*
 302  * AIC-78X0 PCI registers
 303  */
 304 #define CLASS_PROGIF_REVID      0x08
 305 #define         DEVREVID        0x000000FFul
 306 #define         PROGINFC        0x0000FF00ul
 307 #define         SUBCLASS        0x00FF0000ul
 308 #define         BASECLASS       0xFF000000ul
 309 
 310 #define CSIZE_LATTIME           0x0C
 311 #define         CACHESIZE       0x0000003Ful    /* only 5 bits */
 312 #define         LATTIME         0x0000FF00ul
 313 
 314 #define DEVCONFIG               0x40
 315 #define         MPORTMODE       0x00000400ul    /* aic7870 only */
 316 #define         RAMPSM          0x00000200ul    /* aic7870 only */
 317 #define         VOLSENSE        0x00000100ul
 318 #define         SCBRAMSEL       0x00000080ul
 319 #define         MRDCEN          0x00000040ul
 320 #define         EXTSCBTIME      0x00000020ul    /* aic7870 only */
 321 #define         EXTSCBPEN       0x00000010ul    /* aic7870 only */
 322 #define         BERREN          0x00000008ul
 323 #define         DACEN           0x00000004ul
 324 #define         STPWLEVEL       0x00000002ul
 325 #define         DIFACTNEGEN     0x00000001ul    /* aic7870 only */
 326 
 327 /*
 328  *
 329  * Define the format of the SEEPROM registers (16 bits).
 330  *
 331  */
 332 struct seeprom_config {
 333 
 334 /*
 335  * SCSI ID Configuration Flags
 336  */
 337 #define CFXFER          0x0007          /* synchronous transfer rate */
 338 #define CFSYNCH         0x0008          /* enable synchronous transfer */
 339 #define CFDISC          0x0010          /* enable disconnection */
 340 #define CFWIDEB         0x0020          /* wide bus device (wide card) */
 341 /* UNUSED               0x00C0 */
 342 #define CFSTART         0x0100          /* send start unit SCSI command */
 343 #define CFINCBIOS       0x0200          /* include in BIOS scan */
 344 #define CFRNFOUND       0x0400          /* report even if not found */
 345 /* UNUSED               0xF800 */
 346   unsigned short device_flags[16];      /* words 0-15 */
 347 
 348 /*
 349  * BIOS Control Bits
 350  */
 351 #define CFSUPREM        0x0001          /* support all removeable drives */
 352 #define CFSUPREMB       0x0002          /* support removeable drives for boot only */
 353 #define CFBIOSEN        0x0004          /* BIOS enabled */
 354 /* UNUSED               0x0008 */
 355 #define CFSM2DRV        0x0010          /* support more than two drives */
 356 #define CF284XEXTEND    0x0020          /* extended translation (284x cards) */
 357 /* UNUSED               0x0040 */
 358 #define CFEXTEND        0x0080          /* extended translation enabled */
 359 /* UNUSED               0xFF00 */
 360   unsigned short bios_control;          /* word 16 */
 361 
 362 /*
 363  * Host Adapter Control Bits
 364  */
 365 /* UNUSED               0x0001 */
 366 #define CFULTRAEN       0x0002          /* Ultra SCSI speed enable (Ultra cards) */
 367 #define CF284XSELTO     0x0003          /* Selection timeout (284x cards) */
 368 #define CF284XFIFO      0x000C          /* FIFO Threshold (284x cards) */
 369 #define CFSTERM         0x0004          /* SCSI low byte termination (non-wide cards) */
 370 #define CFWSTERM        0x0008          /* SCSI high byte termination (wide card) */
 371 #define CFSPARITY       0x0010          /* SCSI parity */
 372 #define CF284XSTERM     0x0020          /* SCSI low byte termination (284x cards) */
 373 #define CFRESETB        0x0040          /* reset SCSI bus at IC initialization */
 374 /* UNUSED               0xFF80 */
 375   unsigned short adapter_control;       /* word 17 */
 376 
 377 /*
 378  * Bus Release, Host Adapter ID
 379  */
 380 #define CFSCSIID        0x000F          /* host adapter SCSI ID */
 381 /* UNUSED               0x00F0 */
 382 #define CFBRTIME        0xFF00          /* bus release time */
 383   unsigned short brtime_id;             /* word 18 */
 384 
 385 /*
 386  * Maximum targets
 387  */
 388 #define CFMAXTARG       0x00FF  /* maximum targets */
 389 /* UNUSED               0xFF00 */
 390   unsigned short max_targets;           /* word 19 */
 391 
 392   unsigned short res_1[11];             /* words 20-30 */
 393   unsigned short checksum;              /* word 31 */
 394 };
 395 
 396 /*
 397  * Pause the sequencer and wait for it to actually stop - this
 398  * is important since the sequencer can disable pausing for critical
 399  * sections.
 400  */
 401 #define PAUSE_SEQUENCER(p) \
 402   outb(p->pause, HCNTRL + p->base);                     \
 403   while ((inb(HCNTRL + p->base) & PAUSE) == 0)          \
 404     ;                                                   \
 405 
 406 /*
 407  * Unpause the sequencer. Unremarkable, yet done often enough to
 408  * warrant an easy way to do it.
 409  */
 410 #define UNPAUSE_SEQUENCER(p) \
 411   outb(p->unpause, HCNTRL + p->base)
 412 
 413 /*
 414  * Restart the sequencer program from address zero
 415  */
 416 #define RESTART_SEQUENCER(p) \
 417   do {                                                  \
 418     outb(SEQRESET | FASTMODE, SEQCTL + p->base);        \
 419   } while (inb(SEQADDR0 + p->base) != 0 &&              \
 420            inb(SEQADDR1 + p->base) != 0);               \
 421   UNPAUSE_SEQUENCER(p);
 422 
 423 /*
 424  * If an error occurs during a data transfer phase, run the comand
 425  * to completion - it's easier that way - making a note of the error
 426  * condition in this location. This then will modify a DID_OK status
 427  * into an appropriate error for the higher-level SCSI code.
 428  */
 429 #define aic7xxx_error(cmd)      ((cmd)->SCp.Status)
 430 
 431 /*
 432  * Keep track of the targets returned status.
 433  */
 434 #define aic7xxx_status(cmd)     ((cmd)->SCp.sent_command)
 435 
 436 /*
 437  * The position of the SCSI commands scb within the scb array.
 438  */
 439 #define aic7xxx_position(cmd)   ((cmd)->SCp.have_data_in)
 440 
 441 /*
 442  * Since the sequencer code DMAs the scatter-gather structures
 443  * directly from memory, we use this macro to assert that the
 444  * kernel structure hasn't changed.
 445  */
 446 #define SG_STRUCT_CHECK(sg) \
 447   ((char *) &(sg).address - (char *) &(sg) != 0 ||  \
 448    (char *) &(sg).length  - (char *) &(sg) != 8 ||  \
 449    sizeof((sg).address) != 4 ||                   \
 450    sizeof((sg).length)  != 4 ||                   \
 451    sizeof(sg)           != 12)
 452 
 453 /*
 454  * "Static" structures. Note that these are NOT initialized
 455  * to zero inside the kernel - we have to initialize them all
 456  * explicitly.
 457  *
 458  * We support multiple adapter cards per interrupt, but keep a
 459  * linked list of Scsi_Host structures for each IRQ.  On an interrupt,
 460  * use the IRQ as an index into aic7xxx_boards[] to locate the card
 461  * information.
 462  */
 463 static struct Scsi_Host *aic7xxx_boards[MAXIRQ + 1];
 464 
 465 /*
 466  * When we detect and register the card, it is possible to
 467  * have the card raise a spurious interrupt.  Because we need
 468  * to support multiple cards, we cannot tell which card caused
 469  * the spurious interrupt.  And, we might not even have added
 470  * the card info to the linked list at the time the spurious
 471  * interrupt gets raised.  This variable is suppose to keep track
 472  * of when we are registering a card and how many spurious
 473  * interrupts we have encountered.
 474  *
 475  *   0 - do not allow spurious interrupts.
 476  *   1 - allow 1 spurious interrupt
 477  *   2 - have 1 spurious interrupt, do not allow any more.
 478  *
 479  * I've made it an integer instead of a boolean in case we
 480  * want to allow more than one spurious interrupt for debugging
 481  * purposes.  Otherwise, it could just go from true to false to
 482  * true (or something like that).
 483  *
 484  * When the driver detects the cards, we'll set the count to 1
 485  * for each card detection and registration.  After the registration
 486  * of a card completes, we'll set the count back to 0.  So far, it
 487  * seems to be enough to allow a spurious interrupt only during
 488  * card registration; if a spurious interrupt is going to occur,
 489  * this is where it happens.
 490  *
 491  * We should be able to find a way to avoid getting the spurious
 492  * interrupt.  But until we do, we have to keep this ugly code.
 493  */
 494 static int aic7xxx_spurious_count;
 495 
 496 /*
 497  * The driver keeps up to four scb structures per card in memory. Only the
 498  * first 25 bytes of the structure are valid for the hardware, the rest used
 499  * for driver level bookkeeping.
 500  */
 501 
 502 struct aic7xxx_scb {
 503 /* ------------    Begin hardware supported fields    ---------------- */
 504 /* 0*/  unsigned char control;
 505 /* 1*/  unsigned char target_channel_lun;       /* 4/1/3 bits */
 506 /* 2*/  unsigned char target_status;
 507 /* 3*/  unsigned char SG_segment_count;
 508 /* 4*/  unsigned char SG_list_pointer[4] __attribute__ ((packed));
 509 /* 8*/  unsigned char residual_SG_segment_count;
 510 /* 9*/  unsigned char residual_data_count[3];
 511 /*12*/  unsigned char data_pointer[4] __attribute__ ((packed));
 512 /*16*/  unsigned long data_count;
 513 /*20*/  unsigned char SCSI_cmd_pointer[4] __attribute__ ((packed));
 514 /*24*/  unsigned char SCSI_cmd_length;
 515 #define SCB_PIO_TRANSFER_SIZE   25      /*
 516                                          * amount we need to upload/download
 517                                          * via rep in/outsb to perform
 518                                          * a request sense.  The second
 519                                          * RESERVED byte is initialized to
 520                                          * 0 in getscb().
 521                                          */
 522 /*25*/  u_char next_waiting;            /* Used to thread SCBs awaiting selection. */
 523         /*-----------------end of hardware supported fields----------------*/
 524         struct aic7xxx_scb *next;       /* next ptr when in free list */
 525         Scsi_Cmnd          *cmd;        /* Scsi_Cmnd for this scb */
 526 #define SCB_FREE               0x00
 527 #define SCB_ACTIVE             0x01
 528 #define SCB_ABORTED            0x02
 529 #define SCB_DEVICE_RESET       0x04
 530 #define SCB_IMMED              0x08
 531 #define SCB_SENSE              0x10
 532         int                 state;          /* current state of scb */
 533         unsigned int        position;       /* Position in scb array */
 534         struct scatterlist  sg;
 535         struct scatterlist  sense_sg;
 536         unsigned char       sense_cmd[6];   /* Allocate 6 characters for sense command */
 537 };
 538 
 539 static struct {
 540   unsigned char errno;
 541   const char *errmesg;
 542 } hard_error[] = {
 543   { ILLHADDR,  "Illegal Host Access" },
 544   { ILLSADDR,  "Illegal Sequencer Address referrenced" },
 545   { ILLOPCODE, "Illegal Opcode in sequencer program" },
 546   { PARERR,    "Sequencer Ram Parity Error" }
 547 };
 548 
 549 static unsigned char
 550 generic_sense[] = { REQUEST_SENSE, 0, 0, 0, 255, 0 };
 551 
 552 /*
 553  * The maximum number of SCBs we could have for ANY type
 554  * of card. DON'T FORGET TO CHANGE THE SCB MASK IN THE
 555  * SEQUENCER CODE IF THIS IS MODIFIED!
 556  */
 557 #define AIC7XXX_MAXSCB  255
 558 
 559 /*
 560  * Define a structure used for each host adapter, only one per IRQ.
 561  */
 562 struct aic7xxx_host {
 563   int                      base;             /* card base address */
 564   int                      maxscb;           /* hardware SCBs */
 565   int                      numscb;           /* current number of scbs */
 566   int                      extended;         /* extended xlate? */
 567   aha_type                 type;             /* card type */
 568   aha_chip_type            chip_type;        /* chip base type */
 569   int                      ultra_enabled;    /* Ultra SCSI speed enabled */
 570   int                      chan_num;         /* for 3940/3985, channel number */
 571   aha_bus_type             bus_type;         /* normal/twin/wide bus */
 572   unsigned char            a_scanned;        /* 0 not scanned, 1 scanned */
 573   unsigned char            b_scanned;        /* 0 not scanned, 1 scanned */
 574   unsigned int             isr_count;        /* Interrupt count */
 575   volatile unsigned char   unpause;          /* unpause value for HCNTRL */
 576   volatile unsigned char   pause;            /* pause value for HCNTRL */
 577   volatile unsigned short  needsdtr_copy;    /* default config */
 578   volatile unsigned short  needsdtr;
 579   volatile unsigned short  sdtr_pending;
 580   volatile unsigned short  needwdtr_copy;    /* default config */
 581   volatile unsigned short  needwdtr;
 582   volatile unsigned short  wdtr_pending;
 583   volatile unsigned short  discenable;       /* Targets allowed to disconnect */
 584   struct seeprom_config    seeprom;
 585   int                      have_seeprom;
 586   struct Scsi_Host        *next;             /* allow for multiple IRQs */
 587   struct aic7xxx_scb       scb_array[AIC7XXX_MAXSCB];  /* active commands */
 588   struct aic7xxx_scb      *free_scb;         /* list of free SCBs */
 589 #ifdef AIC7XXX_PROC_STATS
 590   /*
 591    * Statistics Kept:
 592    *
 593    * Total Xfers (count for each command that has a data xfer),
 594    * broken down further by reads && writes.
 595    *
 596    * Binned sizes, writes && reads:
 597    *    < 512, 512, 1-2K, 2-4K, 4-8K, 8-16K, 16-32K, 32-64K, 64K-128K, > 128K
 598    *
 599    * Total amounts read/written above 512 bytes (amts under ignored)
 600    */
 601   struct aic7xxx_xferstats {
 602     long xfers;                              /* total xfer count */
 603     long w_total;                            /* total writes */
 604     long w_total512;                         /* 512 byte blocks written */
 605     long w_bins[10];                         /* binned write */
 606     long r_total;                            /* total reads */
 607     long r_total512;                         /* 512 byte blocks read */
 608     long r_bins[10];                         /* binned reads */
 609   } stats[2][16][8];                         /* channel, target, lun */
 610 #endif /* AIC7XXX_PROC_STATS */
 611 };
 612 
 613 struct aic7xxx_host_config {
 614   int              irq;        /* IRQ number */
 615   int              base;       /* I/O base */
 616   int              maxscb;     /* hardware SCBs */
 617   int              unpause;    /* unpause value for HCNTRL */
 618   int              pause;      /* pause value for HCNTRL */
 619   int              scsi_id;    /* host SCSI ID */
 620   int              scsi_id_b;  /* host SCSI ID B channel for twin cards */
 621   int              extended;   /* extended xlate? */
 622   int              busrtime;   /* bus release time */
 623   int              walk_scbs;  /* external SCB RAM detected; walk the scb array */
 624   aha_type         type;       /* card type */
 625   aha_chip_type    chip_type;  /* chip base type */
 626   int              ultra_enabled;    /* Ultra SCSI speed enabled */
 627   int              chan_num;   /* for 3940/3985, channel number */
 628   aha_bus_type     bus_type;   /* normal/twin/wide bus */
 629   aha_status_type  parity;     /* bus parity enabled/disabled */
 630   aha_status_type  low_term;   /* bus termination low byte */
 631   aha_status_type  high_term;  /* bus termination high byte (wide cards only) */
 632 };
 633 
 634 /*
 635  * Valid SCSIRATE values. (p. 3-17)
 636  * Provides a mapping of tranfer periods in ns to the proper value to
 637  * stick in the scsiscfr reg to use that transfer rate.
 638  */
 639 static struct {
 640   short period;
 641   /* Rates in Ultra mode have bit 8 of sxfr set */
 642 #define         ULTRA_SXFR 0x100
 643   short rate;
 644   const char *english;
 645 } aic7xxx_syncrates[] = {
 646   {  50,  0x100,  "20.0" },
 647   {  62,  0x110,  "16.0" },
 648   {  75,  0x120,  "13.4" },
 649   { 100,  0x140,  "10.0" },
 650   { 100,  0x000,  "10.0" },
 651   { 125,  0x010,  "8.0"  },
 652   { 150,  0x020,  "6.67" },
 653   { 175,  0x030,  "5.7"  },
 654   { 200,  0x040,  "5.0"  },
 655   { 225,  0x050,  "4.4"  },
 656   { 250,  0x060,  "4.0"  },
 657   { 275,  0x070,  "3.6"  }
 658 };
 659 
 660 static int num_aic7xxx_syncrates =
 661     sizeof(aic7xxx_syncrates) / sizeof(aic7xxx_syncrates[0]);
 662 
 663 #ifdef CONFIG_PCI
 664 static int number_of_39xxs = 0;
 665 #endif CONFIG_PCI
 666 
 667 #ifdef AIC7XXX_DEBUG
 668 static void
 669 debug(const char *fmt, ...)
     /*  */
 670 {
 671   va_list ap;
 672   char buf[256];
 673 
 674   va_start(ap, fmt);
 675   vsprintf(buf, fmt, ap);
 676   printk(buf);
 677   va_end(ap);
 678 }
 679 
 680 static void
 681 debug_config(struct aic7xxx_host_config *p)
     /*  */
 682 {
 683   int host_conf, scsi_conf;
 684   unsigned char brelease;
 685   unsigned char dfthresh;
 686 
 687   static int DFT[] = { 0, 50, 75, 100 };
 688   static int SST[] = { 256, 128, 64, 32 };
 689   static const char *BUSW[] = { "", "-TWIN", "-WIDE" };
 690 
 691   host_conf = inb(HOSTCONF + p->base);
 692   scsi_conf = inb(SCSICONF + p->base);
 693 
 694   /*
 695    * The 7870 gets the bus release time and data FIFO threshold
 696    * from the serial EEPROM (stored in the config structure) and
 697    * scsi_conf register respectively.  The 7770 gets the bus
 698    * release time and data FIFO threshold from the scsi_conf and
 699    * host_conf registers respectively.
 700    */
 701   if (p->chip_type == AIC_777x)
 702   {
 703     dfthresh = (host_conf >> 6);
 704   }
 705   else
 706   {
 707     dfthresh = (scsi_conf >> 6);
 708   }
 709 
 710   brelease = p->busrtime;
 711   if (brelease == 0)
 712   {
 713     brelease = 2;
 714   }
 715 
 716   switch (p->type)
 717   {
 718     case AIC_7770:
 719     case AIC_7771:
 720       printk("%s%s AT EISA SLOT %d:\n", board_names[p->type], BUSW[p->bus_type],
 721              p->base >> 12);
 722       break;
 723 
 724     case AIC_284x:
 725       printk("%s%s AT VLB SLOT %d:\n", board_names[p->type], BUSW[p->bus_type],
 726              p->base >> 12);
 727       break;
 728 
 729     case AIC_7850:
 730     case AIC_7870:
 731     case AIC_7871:
 732     case AIC_7872:
 733     case AIC_7873:
 734     case AIC_7874:
 735     case AIC_7880:
 736     case AIC_7881:
 737     case AIC_7882:
 738     case AIC_7883:
 739     case AIC_7884:
 740       printk("%s%s (PCI-bus):\n", board_names[p->type], BUSW[p->bus_type]);
 741       break;
 742 
 743     default:
 744       panic("aic7xxx: (debug_config) internal error.\n");
 745   }
 746 
 747   printk("    irq %d\n"
 748          "    bus release time %d bclks\n"
 749          "    data fifo threshold %d%%\n",
 750          p->irq,
 751          brelease,
 752          DFT[dfthresh]);
 753 
 754   printk("    SCSI CHANNEL A:\n"
 755          "        scsi id %d\n"
 756          "        scsi selection timeout %d ms\n"
 757          "        scsi bus reset at power-on %sabled\n",
 758          scsi_conf & 0x07,
 759          SST[(scsi_conf >> 3) & 0x03],
 760          (scsi_conf & 0x40) ? "en" : "dis");
 761 
 762   if ((p->chip_type == AIC_777x) && (p->parity == AIC_UNKNOWN))
 763   {
 764     /*
 765      * Set the parity for 7770 based cards.
 766      */
 767     p->parity = (scsi_conf & 0x20) ? AIC_ENABLED : AIC_DISABLED;
 768   }
 769   if (p->parity != AIC_UNKNOWN)
 770   {
 771     printk("        scsi bus parity %sabled\n",
 772            (p->parity == AIC_ENABLED) ? "en" : "dis");
 773   }
 774 
 775   if ((p->type == AIC_7770) || (p->type == AIC_7771))
 776   {
 777     p->low_term = (scsi_conf & 0x80) ? AIC_ENABLED : AIC_DISABLED;
 778   }
 779   if (p->low_term != AIC_UNKNOWN)
 780   {
 781     printk("        scsi bus termination (low byte) %sabled\n",
 782           (p->low_term == AIC_ENABLED) ? "en" : "dis");
 783   }
 784   if ((p->bus_type == AIC_WIDE) && (p->high_term != AIC_UNKNOWN))
 785   {
 786     printk("        scsi bus termination (high byte) %sabled\n",
 787           (p->high_term == AIC_ENABLED) ? "en" : "dis");
 788   }
 789 }
 790 
 791 #if 0
 792 static void
 793 debug_scb(struct aic7xxx_scb *scb)
     /*  */
 794 {
 795   printk("control 0x%x, tcl 0x%x, sg_count %d, sg_ptr 0x%x, cmdp 0x%x, cmdlen %d\n",
 796          scb->control, scb->target_channel_lun, scb->SG_segment_count,
 797          (scb->SG_list_pointer[3] << 24) | (scb->SG_list_pointer[2] << 16) |
 798          (scb->SG_list_pointer[1] << 8) | scb->SG_list_pointer[0],
 799          (scb->SCSI_cmd_pointer[3] << 24) | (scb->SCSI_cmd_pointer[2] << 16) |
 800          (scb->SCSI_cmd_pointer[1] << 8) | scb->SCSI_cmd_pointer[0],
 801          scb->SCSI_cmd_length);
 802   printk("reserved 0x%x, target status 0x%x, resid SG count %d, resid data count %d\n",
 803          (scb->RESERVED[1] << 8) | scb->RESERVED[0], scb->target_status,
 804          scb->residual_SG_segment_count, scb->residual_data_count);
 805   printk("data ptr 0x%x, data count %d, next waiting %d\n",
 806          (scb->data_pointer[3] << 24) | (scb->data_pointer[2] << 16) |
 807          (scb->data_pointer[1] << 8) | scb->data_pointer[0],
 808          scb->data_count, scb->next_waiting);
 809   printk("next ptr 0x%lx, Scsi Cmnd 0x%lx, state 0x%x, position %d\n",
 810          (unsigned long) scb->next, (unsigned long) scb->cmd, scb->state,
 811          scb->position);
 812 }
 813 #endif
 814 
 815 #else
 816 #  define debug(fmt, args...)
 817 #  define debug_config(x)
 818 #  define debug_scb(x)
 819 #endif AIC7XXX_DEBUG
 820 
 821 /*
 822  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 823  *       cards in the system. This should be fixed, but then,
 824  *       does anyone really have more than one in a machine?
 825  */
 826 static unsigned int aic7xxx_extended = 0;    /* extended translation on? */
 827 static unsigned int aic7xxx_no_reset = 0;    /* no resetting of SCSI bus */
 828 
 829 /*+F*************************************************************************
 830  * Function:
 831  *   aic7xxx_setup
 832  *
 833  * Description:
 834  *   Handle Linux boot parameters. This routine allows for assigning a value
 835  *   to a parameter with a ':' between the parameter and the value.
 836  *   ie. aic7xxx=unpause:0x0A,extended
 837  *-F*************************************************************************/
 838 void
 839 aic7xxx_setup(char *s, int *dummy)
     /*  */
 840 {
 841   int   i, n;
 842   char *p;
 843 
 844   static struct {
 845     const char *name;
 846     unsigned int *flag;
 847   } options[] = {
 848     { "extended",    &aic7xxx_extended },
 849     { "no_reset",    &aic7xxx_no_reset },
 850     { NULL,          NULL }
 851   };
 852 
 853   for (p = strtok(s, ","); p; p = strtok(NULL, ","))
 854   {
 855     for (i = 0; options[i].name; i++)
 856     {
 857       n = strlen(options[i].name);
 858       if (!strncmp(options[i].name, p, n))
 859       {
 860         if (p[n] == ':')
 861         {
 862           *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
 863         }
 864         else
 865         {
 866           *(options[i].flag) = !0;
 867         }
 868       }
 869     }
 870   }
 871 }
 872 
 873 /*+F*************************************************************************
 874  * Function:
 875  *   aic7xxx_loadseq
 876  *
 877  * Description:
 878  *   Load the sequencer code into the controller memory.
 879  *-F*************************************************************************/
 880 static void
 881 aic7xxx_loadseq(int base)
     /*  */
 882 {
 883   static unsigned char seqprog[] = {
 884     /*
 885      * Each sequencer instruction is 29 bits
 886      * long (fill in the excess with zeroes)
 887      * and has to be loaded from least -> most
 888      * significant byte, so this table has the
 889      * byte ordering reversed.
 890      */
 891 #   include "aic7xxx_seq.h"
 892   };
 893 
 894   /*
 895    * When the AIC-7770 is paused (as on chip reset), the
 896    * sequencer address can be altered and a sequencer
 897    * program can be loaded by writing it, byte by byte, to
 898    * the sequencer RAM port - the Adaptec documentation
 899    * recommends using REP OUTSB to do this, hence the inline
 900    * assembly. Since the address autoincrements as we load
 901    * the program, reset it back to zero afterward. Disable
 902    * sequencer RAM parity error detection while loading, and
 903    * make sure the LOADRAM bit is enabled for loading.
 904    */
 905   outb(PERRORDIS | SEQRESET | LOADRAM, SEQCTL + base);
 906 
 907   outsb(SEQRAM + base, seqprog, sizeof(seqprog));
 908 
 909   /*
 910    * WARNING!  This is a magic sequence!  After extensive
 911    * experimentation, it seems that you MUST turn off the
 912    * LOADRAM bit before you play with SEQADDR again, else
 913    * you will end up with parity errors being flagged on
 914    * your sequencer program. (You would also think that
 915    * turning off LOADRAM and setting SEQRESET to reset the
 916    * address to zero would work, but you need to do it twice
 917    * for it to take effect on the address. Timing problem?)
 918    */
 919   do {
 920     /*
 921      * Actually, reset it until
 922      * the address shows up as
 923      * zero just to be safe..
 924      */
 925     outb(SEQRESET | FASTMODE, SEQCTL + base);
 926   } while ((inb(SEQADDR0 + base) != 0) && (inb(SEQADDR1 + base) != 0));
 927 }
 928 
 929 /*+F*************************************************************************
 930  * Function:
 931  *   aic7xxx_delay
 932  *
 933  * Description:
 934  *   Delay for specified amount of time.
 935  *-F*************************************************************************/
 936 static void
 937 aic7xxx_delay(int seconds)
     /*  */
 938 {
 939   unsigned long i;
 940 
 941   i = jiffies + (seconds * HZ);  /* compute time to stop */
 942 
 943   while (jiffies < i)
 944   {
 945     ;  /* Do nothing! */
 946   }
 947 }
 948 
 949 /*+F*************************************************************************
 950  * Function:
 951  *   rcs_version
 952  *
 953  * Description:
 954  *   Return a string containing just the RCS version number from either
 955  *   an Id or Revison RCS clause.
 956  *-F*************************************************************************/
 957 const char *
 958 rcs_version(const char *version_info)
     /*  */
 959 {
 960   static char buf[10];
 961   char *bp, *ep;
 962 
 963   bp = NULL;
 964   strcpy(buf, "????");
 965   if (!strncmp(version_info, "$Id: ", 5))
 966   {
 967     if ((bp = strchr(version_info, ' ')) != NULL)
 968     {
 969       bp++;
 970       if ((bp = strchr(bp, ' ')) != NULL)
 971       {
 972         bp++;
 973       }
 974     }
 975   }
 976   else
 977   {
 978     if (!strncmp(version_info, "$Revision: ", 11))
 979     {
 980       if ((bp = strchr(version_info, ' ')) != NULL)
 981       {
 982         bp++;
 983       }
 984     }
 985   }
 986 
 987   if (bp != NULL)
 988   {
 989     if ((ep = strchr(bp, ' ')) != NULL)
 990     {
 991       register int len = ep - bp;
 992 
 993       strncpy(buf, bp, len);
 994       buf[len] = '\0';
 995     }
 996   }
 997 
 998   return buf;
 999 }
1000 
1001 /*+F*************************************************************************
1002  * Function:
1003  *   aic7xxx_info
1004  *
1005  * Description:
1006  *   Return a string describing the driver.
1007  *-F*************************************************************************/
1008 const char *
1009 aic7xxx_info(struct Scsi_Host *notused)
     /*  */
1010 {
1011   static char buffer[128];
1012 
1013   strcpy(buffer, "Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) ");
1014   strcat(buffer, rcs_version(AIC7XXX_C_VERSION));
1015   strcat(buffer, "/");
1016   strcat(buffer, rcs_version(AIC7XXX_H_VERSION));
1017   strcat(buffer, "/");
1018   strcat(buffer, rcs_version(AIC7XXX_SEQ_VER));
1019 
1020   return buffer;
1021 }
1022 
1023 /*+F*************************************************************************
1024  * Function:
1025  *   aic7xxx_length
1026  *
1027  * Description:
1028  *   How much data should be transferred for this SCSI command? Stop
1029  *   at segment sg_last if it's a scatter-gather command so we can
1030  *   compute underflow easily.
1031  *-F*************************************************************************/
1032 static unsigned
1033 aic7xxx_length(Scsi_Cmnd *cmd, int sg_last)
     /*  */
1034 {
1035   int i, segments;
1036   unsigned length;
1037   struct scatterlist *sg;
1038 
1039   segments = cmd->use_sg - sg_last;
1040   sg = (struct scatterlist *) cmd->buffer;
1041 
1042   if (cmd->use_sg)
1043   {
1044     for (i = length = 0; (i < cmd->use_sg) && (i < segments); i++)
1045     {
1046       length += sg[i].length;
1047     }
1048   }
1049   else
1050   {
1051     length = cmd->request_bufflen;
1052   }
1053 
1054   return (length);
1055 }
1056 
1057 /*+F*************************************************************************
1058  * Function:
1059  *   aic7xxx_scsirate
1060  *
1061  * Description:
1062  *   Look up the valid period to SCSIRATE conversion in our table
1063  *-F*************************************************************************/
1064 static void
1065 aic7xxx_scsirate(struct aic7xxx_host *p, unsigned char *scsirate,
     /*  */
1066                  short period, unsigned char offset,
1067                  int target, char channel)
1068 {
1069   int i;
1070 
1071   for (i = 0; i < num_aic7xxx_syncrates; i++)
1072   {
1073     if ((aic7xxx_syncrates[i].period - period) >= 0)
1074     {
1075       /*
1076        * Watch out for Ultra speeds when ultra is not enabled and
1077        * vice-versa.
1078        */
1079       if (p->ultra_enabled)
1080       {
1081         if (!(aic7xxx_syncrates[i].rate & ULTRA_SXFR))
1082         {
1083           printk ("aic7xxx: Target %d, channel %c, requests %sMHz transfers, "
1084                   "but adapter in Ultra mode can only sync at 10MHz or "
1085                   "above.\n", target, channel, aic7xxx_syncrates[i].english);
1086           break;  /* Use asynchronous transfers. */
1087         }
1088       }
1089       else
1090       {
1091         /*
1092          * Check for an Ultra device trying to negotiate an Ultra rate
1093          * on an adapter with Ultra mode disabled.
1094          */
1095         if (aic7xxx_syncrates[i].rate & ULTRA_SXFR)
1096         {
1097           /*
1098            * This should only happen if the driver is the first to negotiate
1099            * and chooses a high rate.  We'll just move down the table until
1100            * we hit a non Ultra speed.
1101            */
1102            continue;
1103         }
1104       }
1105       *scsirate = (aic7xxx_syncrates[i].rate) | (offset & 0x0F);
1106       printk("aic7xxx: Target %d, channel %c, now synchronous at %sMHz, "
1107              "offset(0x%x).\n",
1108              target, channel, aic7xxx_syncrates[i].english, offset);
1109       return;
1110     }
1111   }
1112 
1113   /*
1114    * Default to asynchronous transfer
1115    */
1116   *scsirate = 0;
1117   printk("aic7xxx: Target %d, channel %c, using asynchronous transfers.\n",
1118          target, channel);
1119 }
1120 
1121 /*+F*************************************************************************
1122  * Function:
1123  *   aic7xxx_putscb
1124  *
1125  * Description:
1126  *   Transfer a SCB to the controller.
1127  *-F*************************************************************************/
1128 static inline void
1129 aic7xxx_putscb(struct aic7xxx_host *p, struct aic7xxx_scb *scb)
     /*  */
1130 {
1131   unsigned char curscb;
1132   int base = p->base;
1133 
1134   curscb = inb(SCBPTR + base);
1135   outb(scb->position, SCBPTR + base);
1136   outb(SCBAUTO, SCBCNT + base);
1137 
1138   /*
1139    * By turning on the SCB auto increment, any reference
1140    * to the SCB I/O space postincrements the SCB address
1141    * we're looking at. So turn this on and dump the relevant
1142    * portion of the SCB to the card.
1143    *
1144    * We can do 16bit transfers on all but 284x.
1145    */
1146   if (p->type == AIC_284x)
1147   {
1148     outsb(SCBARRAY + base, scb, SCB_PIO_TRANSFER_SIZE);
1149   }
1150   else
1151   {
1152     outsl(SCBARRAY + base, scb, (SCB_PIO_TRANSFER_SIZE + 3) / 4);
1153   }
1154 
1155   outb(0, SCBCNT + base);
1156   outb(curscb, SCBPTR + base);
1157 }
1158 
1159 /*+F*************************************************************************
1160  * Function:
1161  *   aic7xxx_getscb
1162  *
1163  * Description:
1164  *   Get a SCB from the controller.
1165  *-F*************************************************************************/
1166 static inline void
1167 aic7xxx_getscb(struct aic7xxx_host *p, struct aic7xxx_scb *scb)
     /*  */
1168 {
1169   int base = p->base;
1170 
1171   /*
1172    * This is almost identical to aic7xxx_putscb().
1173    */
1174   outb(SCBAUTO, SCBCNT + base);
1175   insb(SCBARRAY + base, scb, SCB_PIO_TRANSFER_SIZE);
1176   outb(0, SCBCNT + base);
1177 }
1178 
1179 /*+F*************************************************************************
1180  * Function:
1181  *   aic7xxx_match_scb
1182  *
1183  * Description:
1184  *   Checks to see if an scb matches the target/channel as specified.
1185  *   If target is ALL_TARGETS (-1), then we're looking for any device
1186  *   on the specified channel; this happens when a channel is going
1187  *   to be reset and all devices on that channel must be aborted.
1188  *-F*************************************************************************/
1189 static int
1190 aic7xxx_match_scb(struct aic7xxx_scb *scb, int target, char channel)
     /*  */
1191 {
1192   int targ = (scb->target_channel_lun >> 4) & 0x0F;
1193   char chan = (scb->target_channel_lun & SELBUSB) ? 'B' : 'A';
1194 
1195 #ifdef AIC7XXX_DEBUG_ABORT
1196   printk ("aic7xxx: (match_scb) comparing target/channel %d/%c to scb %d/%c\n",
1197           target, channel, targ, chan);
1198 #endif
1199   if (target == ALL_TARGETS)
1200   {
1201     return (chan == channel);
1202   }
1203   else
1204   {
1205     return ((chan == channel) && (targ == target));
1206   }
1207 }
1208 
1209 /*+F*************************************************************************
1210  * Function:
1211  *   aic7xxx_busy_target
1212  *
1213  * Description:
1214  *   Set the specified target active.
1215  *-F*************************************************************************/
1216 static void
1217 aic7xxx_busy_target(unsigned char target, char channel, int base)
     /*  */
1218 {
1219   unsigned char active;
1220   unsigned long active_port = ACTIVE_A + base;
1221 
1222   if ((target > 0x07) || (channel == 'B'))
1223   {
1224     /*
1225      * targets on the Second channel or above id 7 store info in byte two
1226      * of ACTIVE
1227      */
1228     active_port++;
1229   }
1230   active = inb(active_port);
1231   active |= (0x01 << (target & 0x07));
1232   outb(active, active_port);
1233 }
1234 
1235 /*+F*************************************************************************
1236  * Function:
1237  *   aic7xxx_unbusy_target
1238  *
1239  * Description:
1240  *   Set the specified target inactive.
1241  *-F*************************************************************************/
1242 static void
1243 aic7xxx_unbusy_target(unsigned char target, char channel, int base)
     /*  */
1244 {
1245   unsigned char active;
1246   unsigned long active_port = ACTIVE_A + base;
1247 
1248 #ifdef 0
1249   printk ("aic7xxx: (unbusy_target) target/channel %d/%c\n",
1250           target, channel);
1251 #endif
1252   if ((target > 0x07) || (channel == 'B'))
1253   {
1254     /*
1255      * targets on the Second channel or above id 7 store info in byte two
1256      * of ACTIVE
1257      */
1258     active_port++;
1259   }
1260   active = inb(active_port);
1261   active &= ~(0x01 << (target & 0x07));
1262   outb(active, active_port);
1263 }
1264 
1265 /*+F*************************************************************************
1266  * Function:
1267  *   aic7xxx_done
1268  *
1269  * Description:
1270  *   Calls the higher level scsi done function and frees the scb.
1271  *-F*************************************************************************/
1272 static void
1273 aic7xxx_done(struct aic7xxx_host *p, struct aic7xxx_scb *scb)
     /*  */
1274 {
1275   long flags;
1276   Scsi_Cmnd *cmd = scb->cmd;
1277 
1278 #ifdef 0
1279   printk ("aic7xxx: (done) target/channel %d/%d\n",
1280           cmd->target, cmd->channel);
1281 #endif
1282   /*
1283    * This is a critical section, since we don't want the
1284    * queue routine mucking with the host data.
1285    */
1286   save_flags(flags);
1287   cli();
1288 
1289   /*
1290    * Process the command after marking the scb as free
1291    * and adding it to the free list.
1292    */
1293   scb->state = SCB_FREE;
1294   scb->next = p->free_scb;
1295   p->free_scb = scb;
1296   scb->cmd = NULL;
1297 
1298   restore_flags(flags);
1299 
1300   cmd->scsi_done(cmd);
1301 }
1302 
1303 /*+F*************************************************************************
1304  * Function:
1305  *   aic7xxx_add_waiting_scb
1306  *
1307  * Description:
1308  *   Add this SCB to the "waiting for selection" list.
1309  *-F*************************************************************************/
1310 static void
1311 aic7xxx_add_waiting_scb(u_long              base,
     /*  */
1312                         struct aic7xxx_scb *scb,
1313                         insert_type         where)
1314 {
1315   unsigned char head;
1316   unsigned char curscb;
1317 
1318   curscb = inb(SCBPTR + base);
1319   head = inb(WAITING_SCBH + base);
1320   if (head == SCB_LIST_NULL)
1321   {
1322     /*
1323      * List was empty
1324      */
1325     head = scb->position;
1326   }
1327   else
1328   {
1329     if (where == LIST_HEAD)
1330     {
1331       outb(scb->position, SCBPTR + base);
1332       outb(head, SCB_NEXT_WAITING + base);
1333       head = scb->position;
1334     }
1335     else
1336     {
1337       /* where == LIST_SECOND */
1338       unsigned char third_scb;
1339 
1340       outb(head, SCBPTR + base);
1341       third_scb = inb(SCB_NEXT_WAITING + base);
1342       outb(scb->position, SCB_NEXT_WAITING + base);
1343       outb(scb->position, SCBPTR + base);
1344       outb(third_scb, SCB_NEXT_WAITING + base);
1345     }
1346   }
1347   outb(head, WAITING_SCBH + base);
1348   outb(curscb, SCBPTR + base);
1349 }
1350 
1351 /*+F*************************************************************************
1352  * Function:
1353  *   aic7xxx_abort_waiting_scb
1354  *
1355  * Description:
1356  *   Manipulate the waiting for selection list and return the
1357  *   scb that follows the one that we remove.
1358  *-F*************************************************************************/
1359 static unsigned char
1360 aic7xxx_abort_waiting_scb(struct aic7xxx_host *p, struct aic7xxx_scb *scb,
     /*  */
1361                           unsigned char prev, unsigned char timedout_scb)
1362 {
1363   unsigned char curscb, next;
1364   int target = (scb->target_channel_lun >> 4) & 0x0F;
1365   char channel = (scb->target_channel_lun & SELBUSB) ? 'B' : 'A';
1366   int base = p->base;
1367 
1368   /*
1369    * Select the SCB we want to abort and
1370    * pull the next pointer out of it.
1371    */
1372   curscb = inb(SCBPTR + base);
1373   outb(scb->position, SCBPTR + base);
1374   next = inb(SCB_NEXT_WAITING + base);
1375 
1376   /*
1377    * Clear the necessary fields
1378    */
1379   outb(0, SCBARRAY + base);
1380   outb(SCB_LIST_NULL, SCB_NEXT_WAITING + base);
1381   aic7xxx_unbusy_target(target, channel, base);
1382 
1383   /*
1384    * Update the waiting list
1385    */
1386   if (prev == SCB_LIST_NULL)
1387   {
1388     /*
1389      * First in the list
1390      */
1391     outb(next, WAITING_SCBH + base);
1392   }
1393   else
1394   {
1395     /*
1396      * Select the scb that pointed to us and update its next pointer.
1397      */
1398     outb(prev, SCBPTR + base);
1399     outb(next, SCB_NEXT_WAITING + base);
1400   }
1401   /*
1402    * Update the tail pointer
1403    */
1404   if (inb(WAITING_SCBT + base) == scb->position)
1405   {
1406     outb(prev, WAITING_SCBT + base);
1407   }
1408 
1409   /*
1410    * Point us back at the original scb position
1411    * and inform the SCSI system that the command
1412    * has been aborted.
1413    */
1414   outb(curscb, SCBPTR + base);
1415   scb->state |= SCB_ABORTED;
1416   scb->cmd->result = (DID_RESET << 16);
1417   aic7xxx_done(p, scb);
1418 
1419 #ifdef AIC7XXX_DEBUG_ABORT
1420   printk ("aic7xxx: (abort_waiting_scb) target/channel %d/%c, prev %d, "
1421           "to_scb %d, next %d\n", target, channel, prev, timedout_scb, next);
1422 #endif
1423   return (next);
1424 }
1425 
1426 /*+F*************************************************************************
1427  * Function:
1428  *   aic7xxx_reset_device
1429  *
1430  * Description:
1431  *   The device at the given target/channel has been reset.  Abort
1432  *   all active and queued scbs for that target/channel.
1433  *-F*************************************************************************/
1434 static int
1435 aic7xxx_reset_device(struct aic7xxx_host *p, int target, char channel,
     /*  */
1436                      unsigned char timedout_scb)
1437 {
1438   int base = p->base;
1439   struct aic7xxx_scb *scb;
1440   unsigned char active_scb;
1441   int i = 0;
1442   int found = 0;
1443 
1444   /*
1445    * Restore this when we're done
1446    */
1447   active_scb = inb(SCBPTR + base);
1448 
1449 #ifdef AIC7XXX_DEBUG_ABORT
1450   printk ("aic7xxx: (reset_device) target/channel %d/%c, to_scb %d, "
1451           "active_scb %d\n", target, channel, timedout_scb, active_scb);
1452 #endif
1453   /*
1454    * Search the QINFIFO.
1455    */
1456   {
1457     int saved_queue[AIC7XXX_MAXSCB];
1458     int queued = inb(QINCNT + base);
1459 
1460     for (i = 0; i < (queued - found); i++)
1461     {
1462       saved_queue[i] = inb(QINFIFO + base);
1463       scb = &(p->scb_array[saved_queue[i]]);
1464       if (aic7xxx_match_scb(scb, target, channel))
1465       {
1466         /*
1467          * We found an scb that needs to be aborted.
1468          */
1469         scb->state |= SCB_ABORTED;
1470         scb->cmd->result = (DID_RESET << 16);
1471         aic7xxx_done(p, scb);
1472         outb(scb->position, SCBPTR + base);
1473         outb(0, SCBARRAY + base);
1474         i--;
1475         found++;
1476       }
1477     }
1478     /*
1479      * Now put the saved scbs back.
1480      */
1481     for (queued = 0; queued < i; queued++)
1482     {
1483       outb(saved_queue[queued], QINFIFO + base);
1484     }
1485   }
1486 
1487   /*
1488    * Search waiting for selection list.
1489    */
1490   {
1491     unsigned char next, prev;
1492 
1493     next = inb(WAITING_SCBH + base);  /* Start at head of list. */
1494     prev = SCB_LIST_NULL;
1495 
1496     while (next != SCB_LIST_NULL)
1497     {
1498       scb = &(p->scb_array[next]);
1499       /*
1500        * Select the SCB.
1501        */
1502       if (aic7xxx_match_scb(scb, target, channel))
1503       {
1504         next = aic7xxx_abort_waiting_scb(p, scb, prev, timedout_scb);
1505         found++;
1506       }
1507       else
1508       {
1509         outb(scb->position, SCBPTR + base);
1510         prev = next;
1511         next = inb(SCB_NEXT_WAITING + base);
1512       }
1513     }
1514   }
1515 
1516   /*
1517    * Go through the entire SCB array now and look for
1518    * commands for this target that are active.  These
1519    * are other (most likely tagged) commands that
1520    * were disconnected when the reset occured.
1521    */
1522   for (i = 0; i < p->numscb; i++)
1523   {
1524     scb = &(p->scb_array[i]);
1525     if ((scb->state & SCB_ACTIVE) && aic7xxx_match_scb(scb, target, channel))
1526     {
1527       /*
1528        * Ensure the target is "free"
1529        */
1530       aic7xxx_unbusy_target(target, channel, base);
1531       outb(scb->position, SCBPTR + base);
1532       outb(0, SCBARRAY + base);
1533       scb->state |= SCB_ABORTED;
1534       scb->cmd->result = (DID_RESET << 16);
1535       aic7xxx_done(p, scb);
1536       found++;
1537     }
1538   }
1539 
1540   outb(active_scb, SCBPTR + base);
1541   return (found);
1542 }
1543 
1544 /*+F*************************************************************************
1545  * Function:
1546  *   aic7xxx_reset_current_bus
1547  *
1548  * Description:
1549  *   Reset the current SCSI bus.
1550  *-F*************************************************************************/
1551 static void
1552 aic7xxx_reset_current_bus(int base)
     /*  */
1553 {
1554 #ifdef AIC7XXX_DEBUG_ABORT
1555     printk ("aic7xxx: (reset_current_bus)\n");
1556 #endif
1557   outb(SCSIRSTO, SCSISEQ + base);
1558   udelay(1000);
1559   outb(0, SCSISEQ + base);
1560 }
1561 
1562 /*+F*************************************************************************
1563  * Function:
1564  *   aic7xxx_reset_channel
1565  *
1566  * Description:
1567  *   Reset the channel.
1568  *-F*************************************************************************/
1569 static int
1570 aic7xxx_reset_channel(struct aic7xxx_host *p, char channel,
     /*  */
1571                      unsigned char timedout_scb)
1572 {
1573   int base = p->base;
1574   unsigned char sblkctl;
1575   char cur_channel;
1576   unsigned long offset, offset_max;
1577   int found;
1578 
1579 #ifdef AIC7XXX_DEBUG_ABORT
1580   printk ("aic7xxx: (reset_channel) channel %c, to_scb %d\n",
1581           channel, timedout_scb);
1582 #endif
1583   /*
1584    * Clean up all the state information for the
1585    * pending transactions on this bus.
1586    */
1587   found = aic7xxx_reset_device(p, ALL_TARGETS, channel, timedout_scb);
1588 
1589   if (channel == 'B')
1590   {
1591     p->needsdtr |= (p->needsdtr_copy & 0xFF00);
1592     p->sdtr_pending &= 0x00FF;
1593     outb(0, ACTIVE_B + base);
1594     offset = TARG_SCRATCH + base + 8;
1595     offset_max = TARG_SCRATCH + base + 16;
1596   }
1597   else
1598   {
1599     if (p->bus_type == AIC_WIDE)
1600     {
1601       p->needsdtr = p->needsdtr_copy;
1602       p->needwdtr = p->needwdtr_copy;
1603       p->sdtr_pending = 0x0;
1604       p->wdtr_pending = 0x0;
1605       outb(0, ACTIVE_A + base);
1606       outb(0, ACTIVE_B + base);
1607       offset = TARG_SCRATCH + base;
1608       offset_max = TARG_SCRATCH + base + 16;
1609     }
1610     else
1611     {
1612       p->needsdtr |= (p->needsdtr_copy & 0x00FF);
1613       p->sdtr_pending &= 0xFF00;
1614       outb(0, ACTIVE_A + base);
1615       offset = TARG_SCRATCH + base;
1616       offset_max = TARG_SCRATCH + base + 8;
1617     }
1618   }
1619   while (offset < offset_max)
1620   {
1621     /*
1622      * Revert to async/narrow transfers
1623      * until we renegotiate.
1624      */
1625     u_char targ_scratch;
1626     targ_scratch = inb(offset);
1627     targ_scratch &= SXFR;
1628     outb(targ_scratch, offset);
1629     offset++;
1630   }
1631 
1632   /*
1633    * Reset the bus and unpause/restart the controller
1634    */
1635 
1636   /*
1637    * Case 1: Command for another bus is active
1638    */
1639   sblkctl = inb(SBLKCTL + base);
1640   cur_channel = (sblkctl & SELBUSB) ? 'B' : 'A';
1641   if (cur_channel != channel)
1642   {
1643 #ifdef AIC7XXX_DEBUG_ABORT
1644     printk ("aic7xxx: (reset_channel) Stealthily resetting channel %c\n",
1645             channel);
1646 #endif
1647     /*
1648      * Stealthily reset the other bus without upsetting the current bus
1649      */
1650     outb(sblkctl ^ SELBUSB, SBLKCTL + base);
1651     aic7xxx_reset_current_bus(base);
1652     outb(sblkctl, SBLKCTL + base);
1653 
1654     UNPAUSE_SEQUENCER(p);
1655   }
1656   /*
1657    * Case 2: A command from this bus is active or we're idle
1658    */
1659   else
1660   {
1661 #ifdef AIC7XXX_DEBUG_ABORT
1662     printk ("aic7xxx: (reset_channel) Resetting current channel %c\n",
1663             channel);
1664 #endif
1665     aic7xxx_reset_current_bus(base);
1666     RESTART_SEQUENCER(p);
1667   }
1668 
1669   return found;
1670 }
1671 
1672 /*+F*************************************************************************
1673  * Function:
1674  *   aic7xxx_isr
1675  *
1676  * Description:
1677  *   SCSI controller interrupt handler.
1678  *
1679  *   NOTE: Since we declared this using SA_INTERRUPT, interrupts should
1680  *         be disabled all through this function unless we say otherwise.
1681  *-F*************************************************************************/
1682 static void
1683 aic7xxx_isr(int irq, void *dev_id, struct pt_regs * regs)
     /*  */
1684 {
1685   int base, intstat;
1686   struct aic7xxx_host *p;
1687   struct aic7xxx_scb *scb;
1688   unsigned char ha_flags;
1689   short         transfer;
1690   unsigned char scsi_id, bus_width;
1691   unsigned char offset, rate, scratch, scratch_offset;
1692   unsigned char max_offset, rej_byte;
1693   unsigned short target_mask;
1694   char channel;
1695   void *addr;
1696   int actual;
1697   int scb_index;
1698   Scsi_Cmnd *cmd;
1699 
1700   p = (struct aic7xxx_host *) aic7xxx_boards[irq]->hostdata;
1701 
1702   /*
1703    * Search for the host with a pending interrupt.  If we can't find
1704    * one, then we've encountered a spurious interrupt.
1705    */
1706   while ((p != NULL) && !(inb(INTSTAT + p->base) & INT_PEND))
1707   {
1708     if (p->next == NULL)
1709     {
1710       p = NULL;
1711     }
1712     else
1713     {
1714       p = (struct aic7xxx_host *) p->next->hostdata;
1715     }
1716   }
1717 
1718   if (p == NULL)
1719   {
1720     if (aic7xxx_spurious_count == 1)
1721     {
1722       aic7xxx_spurious_count = 2;
1723       printk("aic7xxx: (aic7xxx_isr) Encountered spurious interrupt.\n");
1724       return;
1725     }
1726     else
1727     {
1728       /*
1729        * The best we can do is to set p back to head of list and process
1730        * the erroneous interrupt - most likely a BRKADRINT.
1731        */
1732       p = (struct aic7xxx_host *) aic7xxx_boards[irq]->hostdata;
1733     }
1734   }
1735 
1736   /*
1737    * Keep track of interrupts for /proc/scsi
1738    */
1739   p->isr_count++;
1740 
1741   if (!p->a_scanned && (p->isr_count == 1))
1742   {
1743     /*
1744      * We must only have one card at this IRQ and it must have been
1745      * added to the board data before the spurious interrupt occurred.
1746      * It is sufficient that we check isr_count and not the spurious
1747      * interrupt count.
1748      */
1749     printk("aic7xxx: (aic7xxx_isr) Encountered spurious interrupt.\n");
1750     return;
1751   }
1752 
1753   base = p->base;
1754   /*
1755    * Handle all the interrupt sources - especially for SCSI
1756    * interrupts, we won't get a second chance at them.
1757    */
1758   intstat = inb(INTSTAT + base);
1759 
1760   if (intstat & BRKADRINT)
1761   {
1762     int i;
1763     unsigned char errno = inb(ERROR + base);
1764 
1765     printk("aic7xxx: (aic7xxx_isr) BRKADRINT error(0x%x):\n", errno);
1766     for (i = 0; i < NUMBER(hard_error); i++)
1767     {
1768       if (errno & hard_error[i].errno)
1769       {
1770         printk("  %s\n", hard_error[i].errmesg);
1771       }
1772     }
1773 
1774     panic("aic7xxx: (aic7xxx_isr) BRKADRINT, error(0x%x) seqaddr(0x%x).\n",
1775           inb(ERROR + base), (inb(SEQADDR1 + base) << 8) | inb(SEQADDR0 + base));
1776   }
1777 
1778   if (intstat & SEQINT)
1779   {
1780     /*
1781      * Although the sequencer is paused immediately on
1782      * a SEQINT, an interrupt for a SCSIINT condition will
1783      * unpaused the sequencer before this point.
1784      */
1785     PAUSE_SEQUENCER(p);
1786 
1787     scsi_id = (inb(SCSIID + base) >> 4) & 0x0F;
1788     scratch_offset = scsi_id;
1789     channel = 'A';
1790     if (inb(SBLKCTL + base) & SELBUSB)
1791     {
1792       channel = 'B';
1793       scratch_offset += 8;
1794     }
1795     target_mask = (0x01 << scratch_offset);
1796 
1797     switch (intstat & SEQINT_MASK)
1798     {
1799       case BAD_PHASE:
1800         panic("aic7xxx: (aic7xxx_isr) Unknown scsi bus phase.\n");
1801         break;
1802 
1803       case SEND_REJECT:
1804         rej_byte = inb(REJBYTE + base);
1805         if ((rej_byte & 0xF0) == 0x20)
1806         {
1807           scb_index = inb(SCBPTR + base);
1808           scb = &(p->scb_array[scb_index]);
1809           printk("aic7xxx: Warning - Tagged message received without identify."
1810                  "Disabling tagged commands for target %d channel %c.\n",
1811                   scsi_id, channel);
1812           scb->cmd->device->tagged_supported = 0;
1813           scb->cmd->device->tagged_queue = 0;
1814         }
1815         else
1816         {
1817           debug("aic7xxx: Warning - Rejecting unknown message (0x%x) received "
1818                 "from target %d channel %c.\n", rej_byte, scsi_id, channel);
1819         }
1820         break;
1821 
1822       case NO_IDENT:
1823         panic("aic7xxx: Target %d, channel %c, did not send an IDENTIFY "
1824               "message. SAVED_TCL(0x%x).\n",
1825               scsi_id, channel, inb(SAVED_TCL + base));
1826         break;
1827 
1828       case NO_MATCH:
1829         printk("aic7xxx: No active SCB for reconnecting target %d, "
1830               "channel %c - Issuing ABORT. SAVED_TCL(0x%x).\n",
1831               scsi_id, channel, inb(SAVED_TCL + base));
1832         aic7xxx_unbusy_target(scsi_id, channel, base);
1833         outb(0, SCBARRAY + base);
1834         outb(CLRSELTIMEO, CLRSINT1 + base);
1835         RESTART_SEQUENCER(p);
1836         break;
1837 
1838       case SDTR_MSG:
1839         /*
1840          * Help the sequencer to translate the negotiated
1841          * transfer rate. Transfer is 1/4 the period
1842          * in ns as is returned by the sync negotiation
1843          * message. So, we must multiply by four.
1844          */
1845         transfer = (inb(ARG_1 + base) << 2);
1846         offset = inb(ACCUM + base);
1847         scratch = inb(TARG_SCRATCH + base + scratch_offset);
1848         /*
1849          * The maximum offset for a wide device is 0x08; for a
1850          * 8-bit bus device the maximum offset is 0x0F.
1851          */
1852         if (scratch & WIDEXFER)
1853         {
1854           max_offset = 0x08;
1855         }
1856         else
1857         {
1858           max_offset = 0x0F;
1859         }
1860         aic7xxx_scsirate(p, &rate, transfer, MIN(offset, max_offset),
1861                          scsi_id, channel);
1862         /*
1863          * Preserve the wide transfer flag.
1864          */
1865         scratch = rate | (scratch & WIDEXFER);
1866         outb(scratch, TARG_SCRATCH + base + scratch_offset);
1867         outb(scratch, SCSIRATE + base);
1868         if ((scratch & 0x0F) == 0)
1869         { /*
1870            * The requested rate was so low that asynchronous transfers
1871            * are faster (not to mention the controller won't support
1872            * them), so we issue a reject to ensure we go to asynchronous
1873            * transfers.
1874            */
1875            outb(SEND_REJ, RETURN_1 + base);
1876         }
1877         else
1878         {
1879           /*
1880            * See if we initiated Sync Negotiation
1881            */
1882           if (p->sdtr_pending & target_mask)
1883           {
1884             /*
1885              * Don't send an SDTR back to the target.
1886              */
1887             outb(0, RETURN_1 + base);
1888           }
1889           else
1890           {
1891             /*
1892              * Send our own SDTR in reply.
1893              */
1894             printk("aic7xxx: Sending SDTR!!\n");
1895             outb(SEND_SDTR, RETURN_1 + base);
1896           }
1897         }
1898         /*
1899          * Clear the flags.
1900          */
1901         p->needsdtr &= ~target_mask;
1902         p->sdtr_pending &= ~target_mask;
1903         break;
1904 
1905       case WDTR_MSG:
1906       {
1907         bus_width = inb(ARG_1 + base);
1908         printk("aic7xxx: Received MSG_WDTR, Target %d, channel %c "
1909                "needwdtr(0x%x).\n", scsi_id, channel, p->needwdtr);
1910         scratch = inb(TARG_SCRATCH + base + scratch_offset);
1911 
1912         if (p->wdtr_pending & target_mask)
1913         {
1914           /*
1915            * Don't send an WDTR back to the target, since we asked first.
1916            */
1917           outb(0, RETURN_1 + base);
1918           switch (bus_width)
1919           {
1920             case BUS_8_BIT:
1921               scratch &= 0x7F;
1922               break;
1923 
1924             case BUS_16_BIT:
1925               printk("aic7xxx: Target %d, channel %c, using 16 bit "
1926                      "transfers.\n", scsi_id, channel);
1927               scratch |= 0x80;
1928               break;
1929 
1930             case BUS_32_BIT:
1931               outb(SEND_REJ, RETURN_1 + base);
1932               printk("aic7xxx: Target %d, channel %c, requesting 32 bit "
1933                      "transfers, rejecting...\n", scsi_id, channel);
1934               break;
1935           }
1936         }
1937         else
1938         {
1939           /*
1940            * Send our own WDTR in reply.
1941            */
1942           printk("aic7xxx: Will send WDTR!!\n");
1943           switch (bus_width)
1944           {
1945             case BUS_8_BIT:
1946               scratch &= 0x7F;
1947               break;
1948 
1949             case BUS_32_BIT:
1950               /*
1951                * Negotiate 16 bits.
1952                */
1953               bus_width = BUS_16_BIT;
1954               /* Yes, we mean to fall thru here. */
1955 
1956             case BUS_16_BIT:
1957               printk("aic7xxx: Target %d, channel %c, using 16 bit "
1958                      "transfers.\n", scsi_id, channel);
1959               scratch |= 0x80;
1960               break;
1961           }
1962           outb(bus_width | SEND_WDTR, RETURN_1 + base);
1963         }
1964         p->needwdtr &= ~target_mask;
1965         p->wdtr_pending &= ~target_mask;
1966         outb(scratch, TARG_SCRATCH + base + scratch_offset);
1967         outb(scratch, SCSIRATE + base);
1968         break;
1969       }
1970 
1971       case REJECT_MSG:
1972       {
1973         /*
1974          * What we care about here is if we had an
1975          * outstanding SDTR or WDTR message for this
1976          * target. If we did, this is a signal that
1977          * the target is refusing negotiation.
1978          */
1979 
1980         scratch = inb(TARG_SCRATCH + base + scratch_offset);
1981 
1982         if (p->wdtr_pending & target_mask)
1983         {
1984           /*
1985            * note 8bit xfers and clear flag
1986            */
1987           scratch &= 0x7F;
1988           p->needwdtr &= ~target_mask;
1989           p->wdtr_pending &= ~target_mask;
1990           printk("aic7xxx: Target %d, channel %c, refusing WIDE negotiation. "
1991                  "Using 8 bit transfers.\n", scsi_id, channel);
1992         }
1993         else
1994         {
1995           if (p->sdtr_pending & target_mask)
1996           {
1997             /*
1998              * note asynch xfers and clear flag
1999              */
2000             scratch &= 0xF0;
2001             p->needsdtr &= ~target_mask;
2002             p->sdtr_pending &= ~target_mask;
2003             printk("aic7xxx: Target %d, channel %c, refusing synchronous "
2004                    "negotiation. Using asynchronous transfers.\n",
2005                    scsi_id, channel);
2006           }
2007           /*
2008            * Otherwise, we ignore it.
2009            */
2010         }
2011         outb(scratch, TARG_SCRATCH + base + scratch_offset);
2012         outb(scratch, SCSIRATE + base);
2013         break;
2014       }
2015 
2016       case BAD_STATUS:
2017         scb_index = inb(SCBPTR + base);
2018         scb = &(p->scb_array[scb_index]);
2019         outb(0, RETURN_1 + base);   /* CHECK_CONDITION may change this */
2020         if (!(scb->state & SCB_ACTIVE) || (scb->cmd == NULL))
2021         {
2022           printk("aic7xxx: Referenced SCB not valid during SEQINT(0x%x) "
2023                  "scb(%d) state(0x%x) cmd(0x%x).\n",
2024                  intstat, scb_index, scb->state, (unsigned int) scb->cmd);
2025         }
2026         else
2027         {
2028           cmd = scb->cmd;
2029           aic7xxx_getscb(p, scb);
2030           aic7xxx_status(cmd) = scb->target_status;
2031 
2032           cmd->result |= scb->target_status;
2033 
2034           switch (status_byte(scb->target_status))
2035           {
2036             case GOOD:
2037               printk("aic7xxx: Interrupted for status of GOOD???\n");
2038               break;
2039 
2040             case CHECK_CONDITION:
2041               if ((aic7xxx_error(cmd) == 0) && !(cmd->flags & WAS_SENSE))
2042               {
2043                 unsigned char tcl;
2044                 unsigned char control;
2045                 void         *req_buf;
2046 
2047                 tcl = scb->target_channel_lun;
2048 
2049                 /*
2050                  * Send a sense command to the requesting target.
2051                  */
2052                 cmd->flags |= WAS_SENSE;
2053                 memcpy((void *) scb->sense_cmd, (void *) generic_sense,
2054                        sizeof(generic_sense));
2055 
2056                 scb->sense_cmd[1] = (cmd->lun << 5);
2057                 scb->sense_cmd[4] = sizeof(cmd->sense_buffer);
2058 
2059                 scb->sense_sg.address = (char *) &cmd->sense_buffer;
2060                 scb->sense_sg.length = sizeof(cmd->sense_buffer);
2061                 req_buf = &scb->sense_sg;
2062                 cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
2063                 control = scb->control;
2064 
2065                 memset(scb, 0, SCB_PIO_TRANSFER_SIZE);
2066                 scb->control = control & DISCENB;
2067                 scb->target_channel_lun = tcl;
2068                 addr = scb->sense_cmd;
2069                 scb->SCSI_cmd_length = COMMAND_SIZE(scb->sense_cmd[0]);
2070                 memcpy(scb->SCSI_cmd_pointer, &addr,
2071                        sizeof(scb->SCSI_cmd_pointer));
2072                 scb->SG_segment_count = 1;
2073                 memcpy(scb->SG_list_pointer, &req_buf,
2074                         sizeof(scb->SG_list_pointer));
2075                 scb->data_count = scb->sense_sg.length;
2076                 memcpy(scb->data_pointer, &(scb->sense_sg.address), 4);
2077 
2078                 aic7xxx_putscb(p, scb);
2079                 outb(SCB_LIST_NULL, SCB_NEXT_WAITING + base);
2080                 /*
2081                  * Ensure that the target is "BUSY" so we don't get overlapping
2082                  * commands if we happen to be doing tagged I/O.
2083                  */
2084                 aic7xxx_busy_target(scsi_id, channel, base);
2085 
2086                 aic7xxx_add_waiting_scb(base, scb, LIST_HEAD);
2087                 outb(SEND_SENSE, RETURN_1 + base);
2088               }  /* first time sense, no errors */
2089 
2090               cmd->flags &= ~ASKED_FOR_SENSE;
2091               if (aic7xxx_error(cmd) == 0)
2092               {
2093                 aic7xxx_error(cmd) = DID_RETRY_COMMAND;
2094               }
2095               break;
2096 
2097             case BUSY:
2098               printk("aic7xxx: Target busy.\n");
2099               if (!aic7xxx_error(cmd))
2100               {
2101                 aic7xxx_error(cmd) = DID_BUS_BUSY;
2102               }
2103               break;
2104 
2105             case QUEUE_FULL:
2106               printk("aic7xxx: Queue full.\n");
2107               if (!aic7xxx_error(cmd))
2108               {
2109                 aic7xxx_error(cmd) = DID_RETRY_COMMAND;
2110               }
2111               break;
2112 
2113             default:
2114               printk("aic7xxx: Unexpected target status(0x%x).\n",
2115                      scb->target_status);
2116               if (!aic7xxx_error(cmd))
2117               {
2118                 aic7xxx_error(cmd) = DID_RETRY_COMMAND;
2119               }
2120               break;
2121           }  /* end switch */
2122         }  /* end else of */
2123         break;
2124 
2125       case RESIDUAL:
2126         scb_index = inb(SCBPTR + base);
2127         scb = &(p->scb_array[scb_index]);
2128         if (!(scb->state & SCB_ACTIVE) || (scb->cmd == NULL))
2129         {
2130           printk("aic7xxx: Referenced SCB not valid during SEQINT(0x%x) "
2131                  "scb(%d) state(0x%x) cmd(0x%x).\n",
2132                  intstat, scb_index, scb->state, (unsigned int) scb->cmd);
2133         }
2134         else
2135         {
2136           cmd = scb->cmd;
2137           /*
2138            *  Don't destroy valid residual information with
2139            *  residual coming from a check sense operation.
2140            */
2141           if (!(cmd->flags & WAS_SENSE))
2142           {
2143             /*
2144              *  We had an underflow. At this time, there's only
2145              *  one other driver that bothers to check for this,
2146              *  and cmd->underflow seems to be set rather half-
2147              *  heartedly in the higher-level SCSI code.
2148              */
2149             actual = aic7xxx_length(cmd, scb->residual_SG_segment_count);
2150 
2151             actual -= (inb(SCB_RESID_DCNT2 + base) << 16) |
2152                       (inb(SCB_RESID_DCNT1 + base) <<  8) |
2153                       inb(SCB_RESID_DCNT0 + base);
2154 
2155             if (actual < cmd->underflow)
2156             {
2157               printk("aic7xxx: Target %d underflow - "
2158                      "Wanted (at least) (%u) got(%u) count(%d).\n",
2159                      cmd->target, cmd->underflow, actual,
2160                      inb(SCB_RESID_SGCNT + base));
2161               aic7xxx_error(cmd) = DID_RETRY_COMMAND;
2162               aic7xxx_status(cmd) = scb->target_status;
2163             }
2164           }
2165         }
2166         break;
2167 
2168       case ABORT_TAG:
2169         scb_index = inb(SCBPTR + base);
2170         scb = &(p->scb_array[scb_index]);
2171         if (!(scb->state & SCB_ACTIVE) || (scb->cmd == NULL))
2172         {
2173           printk("aic7xxx: Referenced SCB not valid during SEQINT(0x%x) "
2174                  "scb(%d) state(0x%x) cmd(0x%x)\n",
2175                  intstat, scb_index, scb->state, (unsigned int) scb->cmd);
2176         }
2177         else
2178         {
2179           cmd = scb->cmd;
2180           /*
2181            * We didn't receive a valid tag back from the target
2182            * on a reconnect.
2183            */
2184           printk("aic7xxx: Invalid tag received on target %d, channel %c, "
2185                  "lun %d - Sending ABORT_TAG.\n",
2186                   scsi_id, channel, cmd->lun & 0x07);
2187 
2188           cmd->result = (DID_RETRY_COMMAND << 16);
2189           aic7xxx_done(p, scb);
2190         }
2191         break;
2192 
2193       case AWAITING_MSG:
2194         scb_index = inb(SCBPTR + base);
2195         scb = &(p->scb_array[scb_index]);
2196         if (!(scb->state & SCB_ACTIVE) || (scb->cmd == NULL))
2197         {
2198           printk("aic7xxx: Referenced SCB not valid during SEQINT(0x%x) "
2199                  "scb(%d) state(0x%x) cmd(0x%x).\n",
2200                  intstat, scb_index, scb->state, (unsigned int) scb->cmd);
2201         }
2202         else
2203         {
2204           /*
2205            * This SCB had a zero length command, informing the sequencer
2206            * that we wanted to send a special message to this target.
2207            * We only do this for BUS_DEVICE_RESET messages currently.
2208            */
2209            if (scb->state & SCB_DEVICE_RESET)
2210            {
2211 #ifdef AIC7XXX_DEBUG_ABORT
2212   printk ("aic7xxx: (isr) sending bus device reset to target %d\n",
2213           scsi_id);
2214 #endif
2215              outb(MSG_BUS_DEVICE_RESET, MSG0 + base);
2216              outb(1, MSG_LEN + base);
2217            }
2218            else
2219            {
2220              panic("aic7xxx: AWAITING_SCB for an SCB that does "
2221                    "not have a waiting message.\n");
2222            }
2223         }
2224         break;
2225 
2226       case IMMEDDONE:
2227         scb_index = inb(SCBPTR + base);
2228         scb = &(p->scb_array[scb_index]);
2229 #ifdef AIC7XXX_DEBUG_ABORT
2230   printk ("aic7xxx: (isr) received IMMEDDONE for target %d, scb %d, state %d\n",
2231           scsi_id, scb_index, scb->state);
2232 #endif
2233         if (scb->state & SCB_DEVICE_RESET)
2234         {
2235           int found;
2236 
2237           /*
2238            * Go back to async/narrow transfers and renogiate.
2239            */
2240           aic7xxx_unbusy_target(scsi_id, channel, base);
2241           p->needsdtr |= (p->needsdtr_copy & target_mask);
2242           p->needwdtr |= (p->needwdtr_copy & target_mask);
2243           p->sdtr_pending &= ~target_mask;
2244           p->wdtr_pending &= ~target_mask;
2245           scratch = inb(TARG_SCRATCH + base + scratch_offset);
2246           scratch &= SXFR;
2247           outb(scratch, TARG_SCRATCH + base + scratch_offset);
2248           found = aic7xxx_reset_device(p, (int) scsi_id, channel, SCB_LIST_NULL);
2249         }
2250         else
2251         {
2252           panic("aic7xxx: Immediate complete for unknown operation.\n");
2253         }
2254         break;
2255 
2256 #if AIC7XXX_NOT_YET
2257      /* XXX Fill these in later */
2258      case MESG_BUFFER_BUSY:
2259        break;
2260      case MSGIN_PHASEMIS:
2261        break;
2262 #endif
2263 
2264       case PARITY_ERROR:
2265       {
2266         scb_index = inb(SCBPTR + base);
2267         scb = &(p->scb_array[scb_index]);
2268         if (!(scb->state & SCB_ACTIVE) || (scb->cmd == NULL))
2269         {
2270           printk("aic7xxx: Referenced SCB not valid during SEQINT(0x%x) "
2271                  "scb(%d) state(0x%x) cmd(0x%x).\n",
2272                  intstat, scb_index, scb->state, (unsigned int) scb->cmd);
2273         }
2274         else
2275         {
2276           char  *phase;
2277           unsigned char mesg_out = MSG_NOP;
2278           unsigned char lastphase = inb(LASTPHASE + base);
2279 
2280           cmd = scb->cmd;
2281           switch (lastphase)
2282           {
2283             case P_DATAOUT:
2284               phase = "Data-Out";
2285               break;
2286             case P_DATAIN:
2287               phase = "Data-In";
2288               mesg_out = MSG_INITIATOR_DET_ERROR;
2289               break;
2290             case P_COMMAND:
2291               phase = "Command";
2292               break;
2293             case P_MESGOUT:
2294               phase = "Message-Out";
2295               break;
2296             case P_STATUS:
2297               phase = "Status";
2298               mesg_out = MSG_INITIATOR_DET_ERROR;
2299               break;
2300             case P_MESGIN:
2301               phase = "Message-In";
2302               mesg_out = MSG_MSG_PARITY_ERROR;
2303               break;
2304             default:
2305               phase = "unknown";
2306               break;
2307           }
2308 
2309           /*
2310            * A parity error has occurred during a data
2311            * transfer phase. Flag it and continue.
2312            */
2313           printk("aic7xxx: Parity error during phase %s on target %d, "
2314                  "channel %d, lun %d.\n", phase,
2315                  cmd->target, cmd->channel & 0x01, cmd->lun & 0x07);
2316 
2317           /*
2318            * We've set the hardware to assert ATN if we get a parity
2319            * error on "in" phases, so all we need to do is stuff the
2320            * message buffer with the appropriate message. In phases
2321            * have set mesg_out to something other than MSG_NOP.
2322            */
2323           if (mesg_out != MSG_NOP)
2324           {
2325              outb(mesg_out, MSG0 + base);
2326              outb(1, MSG_LEN + base);
2327              aic7xxx_error(cmd) = DID_PARITY;
2328           }
2329           else
2330           {
2331              /*
2332               * Should we allow the target to make this decision for us?
2333               */
2334              aic7xxx_error(cmd) = DID_RETRY_COMMAND;
2335           }
2336         }
2337         break;
2338       }
2339       default:               /* unknown */
2340         debug("aic7xxx: SEQINT, INTSTAT(0x%x) SCSISIGI(0x%x).\n",
2341               intstat, inb(SCSISIGI + base));
2342         break;
2343     }
2344 
2345     outb(CLRSEQINT, CLRINT + base);
2346     UNPAUSE_SEQUENCER(p);
2347   }
2348 
2349   if (intstat & SCSIINT)
2350   {
2351     int status = inb(SSTAT1 + base);
2352     scsi_id = (inb(SCSIID + base) >> 4) & 0x0F;
2353     channel = 'A';
2354     if (inb(SBLKCTL + base) & SELBUSB)
2355     {
2356       channel = 'B';
2357     }
2358 
2359     scb_index = inb(SCBPTR + base);
2360     scb = &(p->scb_array[scb_index]);
2361     if (!(scb->state & SCB_ACTIVE) || (scb->cmd == NULL))
2362     {
2363       printk("aic7xxx: No command for SCB (SCSIINT).\n");
2364       /*
2365        * Turn off the interrupt and set status
2366        * to zero, so that it falls through the
2367        * reset of the SCSIINT code.
2368        */
2369       outb(status, CLRSINT1 + base);
2370       UNPAUSE_SEQUENCER(p);
2371       outb(CLRSCSIINT, CLRINT + base);
2372       scb = NULL;
2373     }
2374     else
2375     {
2376       cmd = scb->cmd;
2377 
2378       /*
2379        * Only the SCSI Status 1 register has information
2380        * about exceptional conditions that we'd have a
2381        * SCSIINT about; anything in SSTAT0 will be handled
2382        * by the sequencer. Note that there can be multiple
2383        * bits set.
2384        */
2385       if (status & SELTO)
2386       {
2387         unsigned char waiting;
2388 
2389         /*
2390          * Hardware selection timer has expired. Turn
2391          * off SCSI selection sequence.
2392          */
2393         outb(ENRSELI, SCSISEQ + base);
2394         cmd->result = (DID_TIME_OUT << 16);
2395         /*
2396          * Clear an pending messages for the timed out
2397          * target and mark the target as free.
2398          */
2399         ha_flags = inb(FLAGS + base);
2400         outb(0, MSG_LEN + base);
2401         aic7xxx_unbusy_target(scsi_id, channel, base);
2402 
2403         outb(0, SCBARRAY + base);
2404 
2405         /*
2406          * Shut off the offending interrupt sources, reset
2407          * the sequencer address to zero and unpause it,
2408          * then call the high-level SCSI completion routine.
2409          *
2410          * WARNING!  This is a magic sequence!  After many
2411          * hours of guesswork, turning off the SCSI interrupts
2412          * in CLRSINT? does NOT clear the SCSIINT bit in
2413          * INTSTAT. By writing to the (undocumented, unused
2414          * according to the AIC-7770 manual) third bit of
2415          * CLRINT, you can clear INTSTAT. But, if you do it
2416          * while the sequencer is paused, you get a BRKADRINT
2417          * with an Illegal Host Address status, so the
2418          * sequencer has to be restarted first.
2419          */
2420         outb(CLRSELTIMEO, CLRSINT1 + base);
2421 
2422         outb(CLRSCSIINT, CLRINT + base);
2423 
2424         /*
2425          * Shift the waiting for selection queue forward
2426          */
2427         waiting = inb(WAITING_SCBH + base);
2428         outb(waiting, SCBPTR + base);
2429         waiting = inb(SCB_NEXT_WAITING + base);
2430         outb(waiting, WAITING_SCBH + base);
2431 
2432         RESTART_SEQUENCER(p);
2433         aic7xxx_done(p, scb);
2434 #if 0
2435   printk("aic7xxx: SELTO SCB(%d) state(0x%x) cmd(0x%x).\n",
2436          scb->position, scb->state, (unsigned int) scb->cmd);
2437 #endif
2438       }
2439       else
2440       {
2441         if (!(status & BUSFREE))
2442         {
2443            /*
2444             * We don't know what's going on. Turn off the
2445             * interrupt source and try to continue.
2446             */
2447            printk("aic7xxx: SSTAT1(0x%x).\n", status);
2448            outb(status, CLRSINT1 + base);
2449            UNPAUSE_SEQUENCER(p);
2450            outb(CLRSCSIINT, CLRINT + base);
2451         }
2452       }
2453     }  /* else */
2454   }
2455 
2456   if (intstat & CMDCMPLT)
2457   {
2458     int complete;
2459 
2460     /*
2461      * The sequencer will continue running when it
2462      * issues this interrupt. There may be >1 commands
2463      * finished, so loop until we've processed them all.
2464      */
2465     do {
2466       complete = inb(QOUTFIFO + base);
2467 
2468       scb = &(p->scb_array[complete]);
2469       if (!(scb->state & SCB_ACTIVE) || (scb->cmd == NULL))
2470       {
2471         printk("aic7xxx: Warning - No command for SCB %d (CMDCMPLT).\n"
2472                "         QOUTCNT(%d) SCB state(0x%x) cmd(0x%x) pos(%d).\n",
2473                complete, inb(QOUTFIFO + base),
2474                scb->state, (unsigned int) scb->cmd, scb->position);
2475         outb(CLRCMDINT, CLRINT + base);
2476         continue;
2477       }
2478       cmd = scb->cmd;
2479 
2480       if ((cmd->flags & WAS_SENSE) && !(cmd->flags & ASKED_FOR_SENSE))
2481       {
2482         /*
2483          * Got sense information.
2484          */
2485         cmd->flags &= ASKED_FOR_SENSE;
2486       }
2487 #if 0
2488       printk("aic7xxx: (complete) State(%d) cmd(0x%x) free(0x%x).\n",
2489              scb->state, (unsigned int) scb->cmd, (unsigned int) p->free_scb);
2490 #endif
2491 
2492       /*
2493        * Clear interrupt status before checking
2494        * the output queue again. This eliminates
2495        * a race condition whereby a command could
2496        * complete between the queue poll and the
2497        * interrupt clearing, so notification of the
2498        * command being complete never made it back
2499        * up to the kernel.
2500        */
2501       outb(CLRCMDINT, CLRINT + base);
2502       aic7xxx_done(p, scb);
2503 #if 0
2504   if (scb != &p->scb_array[scb->position])
2505   {
2506     printk("aic7xxx: (complete) Address mismatch, pos(%d).\n", scb->position);
2507   }
2508   printk("aic7xxx: (complete) State(%d) cmd(0x%x) free(0x%x).\n",
2509          scb->state, (unsigned int) scb->cmd, (unsigned int) p->free_scb);
2510 #endif
2511 
2512 #ifdef AIC7XXX_PROC_STATS
2513       /*
2514        * XXX: we should actually know how much actually transferred
2515        * XXX: for each command, but apparently that's too difficult.
2516        */
2517       actual = aic7xxx_length(cmd, 0);
2518       if (!(cmd->flags & WAS_SENSE) && (actual > 0))
2519       {
2520         struct aic7xxx_xferstats *sp;
2521         long *ptr;
2522         int x;
2523 
2524         sp = &p->stats[cmd->channel & 0x01][cmd->target & 0x0F][cmd->lun & 0x07];
2525         sp->xfers++;
2526 
2527         if (cmd->request.cmd == WRITE)
2528         {
2529           sp->w_total++;
2530           sp->w_total512 += (actual >> 9);
2531           ptr = sp->w_bins;
2532         }
2533         else
2534         {
2535           sp->r_total++;
2536           sp->r_total512 += (actual >> 9);
2537           ptr = sp->r_bins;
2538         }
2539         for (x = 9; x <= 17; x++)
2540         {
2541           if (actual < (1 << x))
2542           {
2543             ptr[x - 9]++;
2544             break;
2545           }
2546         }
2547         if (x > 17)
2548         {
2549           ptr[x - 9]++;
2550         }
2551       }
2552 #endif /* AIC7XXX_PROC_STATS */
2553 
2554     } while (inb(QOUTCNT + base));
2555   }
2556 }
2557 
2558 /*+F*************************************************************************
2559  * Function:
2560  *   aic7xxx_probe
2561  *
2562  * Description:
2563  *   Probing for EISA boards: it looks like the first two bytes
2564  *   are a manufacturer code - three characters, five bits each:
2565  *
2566  *               BYTE 0   BYTE 1   BYTE 2   BYTE 3
2567  *              ?1111122 22233333 PPPPPPPP RRRRRRRR
2568  *
2569  *   The characters are baselined off ASCII '@', so add that value
2570  *   to each to get the real ASCII code for it. The next two bytes
2571  *   appear to be a product and revision number, probably vendor-
2572  *   specific. This is what is being searched for at each port,
2573  *   and what should probably correspond to the ID= field in the
2574  *   ECU's .cfg file for the card - if your card is not detected,
2575  *   make sure your signature is listed in the array.
2576  *
2577  *   The fourth byte's lowest bit seems to be an enabled/disabled
2578  *   flag (rest of the bits are reserved?).
2579  *-F*************************************************************************/
2580 static aha_type
2581 aic7xxx_probe(int slot, int base)
     /*  */
2582 {
2583   int i;
2584   unsigned char buf[4];
2585 
2586   static struct {
2587     int n;
2588     unsigned char signature[sizeof(buf)];
2589     aha_type type;
2590   } AIC7xxx[] = {
2591     { 4, { 0x04, 0x90, 0x77, 0x71 }, AIC_7771 },  /* host adapter 274x */
2592     { 4, { 0x04, 0x90, 0x77, 0x70 }, AIC_7770 },  /* motherboard 7770  */
2593     { 4, { 0x04, 0x90, 0x77, 0x56 }, AIC_284x },  /* 284x, BIOS enabled */
2594     { 4, { 0x04, 0x90, 0x77, 0x57 }, AIC_284x }   /* 284x, BIOS disabled */
2595   };
2596 
2597   /*
2598    * The VL-bus cards need to be primed by
2599    * writing before a signature check.
2600    */
2601   for (i = 0; i < sizeof(buf); i++)
2602   {
2603     outb(0x80 + i, base);
2604     buf[i] = inb(base + i);
2605   }
2606 
2607   for (i = 0; i < NUMBER(AIC7xxx); i++)
2608   {
2609     /*
2610      * Signature match on enabled card?
2611      */
2612     if (!memcmp(buf, AIC7xxx[i].signature, AIC7xxx[i].n))
2613     {
2614       if (inb(base + 4) & 1)
2615       {
2616         return (AIC7xxx[i].type);
2617       }
2618 
2619       printk("aic7xxx: Disabled at slot %d, ignored.\n", slot);
2620     }
2621   }
2622 
2623   return (AIC_NONE);
2624 }
2625 
2626 /*+F*************************************************************************
2627  * Function:
2628  *   read_2840_seeprom
2629  *
2630  * Description:
2631  *   Reads the 2840 serial EEPROM and returns 1 if successful and 0 if
2632  *   not successful.
2633  *
2634  *   See read_seeprom (for the 2940) for the instruction set of the 93C46
2635  *   chip.
2636  *
2637  *   The 2840 interface to the 93C46 serial EEPROM is through the
2638  *   STATUS_2840 and SEECTL_2840 registers.  The CS_2840, CK_2840, and
2639  *   DO_2840 bits of the SEECTL_2840 register are connected to the chip
2640  *   select, clock, and data out lines respectively of the serial EEPROM.
2641  *   The DI_2840 bit of the STATUS_2840 is connected to the data in line
2642  *   of the serial EEPROM.  The EEPROM_TF bit of STATUS_2840 register is
2643  *   useful in that it gives us an 800 nsec timer.  After a read from the
2644  *   SEECTL_2840 register the timing flag is cleard and goes high 800 nsec
2645  *   later.
2646  *
2647  *-F*************************************************************************/
2648 static int
2649 read_2840_seeprom(int base, struct seeprom_config *sc)
     /*  */
2650 {
2651   int i = 0, k = 0;
2652   unsigned char temp;
2653   unsigned short checksum = 0;
2654   unsigned short *seeprom = (unsigned short *) sc;
2655   struct seeprom_cmd {
2656     unsigned char len;
2657     unsigned char bits[3];
2658   };
2659   struct seeprom_cmd seeprom_read = {3, {1, 1, 0}};
2660 
2661 #define CLOCK_PULSE(p) \
2662   while ((inb(STATUS_2840 + base) & EEPROM_TF) == 0)    \
2663   {                                             \
2664     ;  /* Do nothing */                         \
2665   }                                             \
2666   (void) inb(SEECTL_2840 + base);
2667 
2668   /*
2669    * Read the first 32 registers of the seeprom.  For the 2840,
2670    * the 93C46 SEEPROM is a 1024-bit device with 64 16-bit registers
2671    * but only the first 32 are used by Adaptec BIOS.  The loop
2672    * will range from 0 to 31.
2673    */
2674   for (k = 0; k < (sizeof(*sc) / 2); k++)
2675   {
2676     /*
2677      * Send chip select for one clock cycle.
2678      */
2679     outb(CK_2840 | CS_2840, SEECTL_2840 + base);
2680     CLOCK_PULSE(base);
2681 
2682     /*
2683      * Now we're ready to send the read command followed by the
2684      * address of the 16-bit register we want to read.
2685      */
2686     for (i = 0; i < seeprom_read.len; i++)
2687     {
2688       temp = CS_2840 | seeprom_read.bits[i];
2689       outb(temp, SEECTL_2840 + base);
2690       CLOCK_PULSE(base);
2691       temp = temp ^ CK_2840;
2692       outb(temp, SEECTL_2840 + base);
2693       CLOCK_PULSE(base);
2694     }
2695     /*
2696      * Send the 6 bit address (MSB first, LSB last).
2697      */
2698     for (i = 5; i >= 0; i--)
2699     {
2700       temp = k;
2701       temp = (temp >> i) & 1;  /* Mask out all but lower bit. */
2702       temp = CS_2840 | temp;
2703       outb(temp, SEECTL_2840 + base);
2704       CLOCK_PULSE(base);
2705       temp = temp ^ CK_2840;
2706       outb(temp, SEECTL_2840 + base);
2707       CLOCK_PULSE(base);
2708     }
2709 
2710     /*
2711      * Now read the 16 bit register.  An initial 0 precedes the
2712      * register contents which begins with bit 15 (MSB) and ends
2713      * with bit 0 (LSB).  The initial 0 will be shifted off the
2714      * top of our word as we let the loop run from 0 to 16.
2715      */
2716     for (i = 0; i <= 16; i++)
2717     {
2718       temp = CS_2840;
2719       outb(temp, SEECTL_2840 + base);
2720       CLOCK_PULSE(base);
2721       temp = temp ^ CK_2840;
2722       seeprom[k] = (seeprom[k] << 1) | (inb(STATUS_2840 + base) & DI_2840);
2723       outb(temp, SEECTL_2840 + base);
2724       CLOCK_PULSE(base);
2725     }
2726     /*
2727      * The serial EEPROM has a checksum in the last word.  Keep a
2728      * running checksum for all words read except for the last
2729      * word.  We'll verify the checksum after all words have been
2730      * read.
2731      */
2732     if (k < (sizeof(*sc) / 2) - 1)
2733     {
2734       checksum = checksum + seeprom[k];
2735     }
2736 
2737     /*
2738      * Reset the chip select for the next command cycle.
2739      */
2740     outb(0, SEECTL_2840 + base);
2741     CLOCK_PULSE(base);
2742     outb(CK_2840, SEECTL_2840 + base);
2743     CLOCK_PULSE(base);
2744     outb(0, SEECTL_2840 + base);
2745     CLOCK_PULSE(base);
2746   }
2747 
2748 #if 0
2749   printk("Computed checksum 0x%x, checksum read 0x%x\n", checksum, sc->checksum);
2750   printk("Serial EEPROM:");
2751   for (k = 0; k < (sizeof(*sc) / 2); k++)
2752   {
2753     if (((k % 8) == 0) && (k != 0))
2754     {
2755       printk("\n              ");
2756     }
2757     printk(" 0x%x", seeprom[k]);
2758   }
2759   printk("\n");
2760 #endif
2761 
2762   if (checksum != sc->checksum)
2763   {
2764     printk("aic7xxx: SEEPROM checksum error, ignoring SEEPROM settings.\n");
2765     return (0);
2766   }
2767 
2768   return (1);
2769 #undef CLOCK_PULSE
2770 }
2771 
2772 /*+F*************************************************************************
2773  * Function:
2774  *   read_seeprom
2775  *
2776  * Description:
2777  *   Reads the serial EEPROM and returns 1 if successful and 0 if
2778  *   not successful.
2779  *
2780  *   The instruction set of the 93C46 chip is as follows:
2781  *
2782  *               Start  OP
2783  *     Function   Bit  Code  Address    Data     Description
2784  *     -------------------------------------------------------------------
2785  *     READ        1    10   A5 - A0             Reads data stored in memory,
2786  *                                               starting at specified address
2787  *     EWEN        1    00   11XXXX              Write enable must preceed
2788  *                                               all programming modes
2789  *     ERASE       1    11   A5 - A0             Erase register A5A4A3A2A1A0
2790  *     WRITE       1    01   A5 - A0   D15 - D0  Writes register
2791  *     ERAL        1    00   10XXXX              Erase all registers
2792  *     WRAL        1    00   01XXXX    D15 - D0  Writes to all registers
2793  *     EWDS        1    00   00XXXX              Disables all programming
2794  *                                               instructions
2795  *     *Note: A value of X for address is a don't care condition.
2796  *
2797  *   The 93C46 has a four wire interface: clock, chip select, data in, and
2798  *   data out.  In order to perform one of the above functions, you need
2799  *   to enable the chip select for a clock period (typically a minimum of
2800  *   1 usec, with the clock high and low a minimum of 750 and 250 nsec
2801  *   respectively.  While the chip select remains high, you can clock in
2802  *   the instructions (above) starting with the start bit, followed by the
2803  *   OP code, Address, and Data (if needed).  For the READ instruction, the
2804  *   requested 16-bit register contents is read from the data out line but
2805  *   is preceded by an initial zero (leading 0, followed by 16-bits, MSB
2806  *   first).  The clock cycling from low to high initiates the next data
2807  *   bit to be sent from the chip.
2808  *
2809  *   The 7870 interface to the 93C46 serial EEPROM is through the SEECTL
2810  *   register.  After successful arbitration for the memory port, the
2811  *   SEECS bit of the SEECTL register is connected to the chip select.
2812  *   The SEECK, SEEDO, and SEEDI are connected to the clock, data out,
2813  *   and data in lines respectively.  The SEERDY bit of SEECTL is useful
2814  *   in that it gives us an 800 nsec timer.  After a write to the SEECTL
2815  *   register, the SEERDY goes high 800 nsec later.  The one exception
2816  *   to this is when we first request access to the memory port.  The
2817  *   SEERDY goes high to signify that access has been granted and, for
2818  *   this case, has no implied timing.
2819  *
2820  *-F*************************************************************************/
2821 static int
2822 read_seeprom(int base, int offset, struct seeprom_config *sc)
     /*  */
2823 {
2824   int i = 0, k;
2825   unsigned long timeout;
2826   unsigned char temp;
2827   unsigned short checksum = 0;
2828   unsigned short *seeprom = (unsigned short *) sc;
2829   struct seeprom_cmd {
2830     unsigned char len;
2831     unsigned char bits[3];
2832   };
2833   struct seeprom_cmd seeprom_read = {3, {1, 1, 0}};
2834 
2835 #define CLOCK_PULSE(p) \
2836   while ((inb(SEECTL + base) & SEERDY) == 0)    \
2837   {                                             \
2838     ;  /* Do nothing */                         \
2839   }
2840 
2841   /*
2842    * Request access of the memory port.  When access is
2843    * granted, SEERDY will go high.  We use a 1 second
2844    * timeout which should be near 1 second more than
2845    * is needed.  Reason: after the 7870 chip reset, there
2846    * should be no contention.
2847    */
2848   outb(SEEMS, SEECTL + base);
2849   timeout = jiffies + 100;  /* 1 second timeout */
2850   while ((jiffies < timeout) && ((inb(SEECTL + base) & SEERDY) == 0))
2851   {
2852     ; /* Do nothing!  Wait for access to be granted.  */
2853   }
2854   if ((inb(SEECTL + base) & SEERDY) == 0)
2855   {
2856     outb(0, SEECTL + base);
2857     return (0);
2858   }
2859 
2860   /*
2861    * Read the first 32 registers of the seeprom.  For the 7870,
2862    * the 93C46 SEEPROM is a 1024-bit device with 64 16-bit registers
2863    * but only the first 32 are used by Adaptec BIOS.  The loop
2864    * will range from 0 to 31.
2865    */
2866   for (k = 0; k < (sizeof(*sc) / 2); k++)
2867   {
2868     /*
2869      * Send chip select for one clock cycle.
2870      */
2871     outb(SEEMS | SEECK | SEECS, SEECTL + base);
2872     CLOCK_PULSE(base);
2873 
2874     /*
2875      * Now we're ready to send the read command followed by the
2876      * address of the 16-bit register we want to read.
2877      */
2878     for (i = 0; i < seeprom_read.len; i++)
2879     {
2880       temp = SEEMS | SEECS | (seeprom_read.bits[i] << 1);
2881       outb(temp, SEECTL + base);
2882       CLOCK_PULSE(base);
2883       temp = temp ^ SEECK;
2884       outb(temp, SEECTL + base);
2885       CLOCK_PULSE(base);
2886     }
2887     /*
2888      * Send the 6 bit address (MSB first, LSB last).
2889      */
2890     for (i = 5; i >= 0; i--)
2891     {
2892       temp = k + offset;
2893       temp = (temp >> i) & 1;  /* Mask out all but lower bit. */
2894       temp = SEEMS | SEECS | (temp << 1);
2895       outb(temp, SEECTL + base);
2896       CLOCK_PULSE(base);
2897       temp = temp ^ SEECK;
2898       outb(temp, SEECTL + base);
2899       CLOCK_PULSE(base);
2900     }
2901 
2902     /*
2903      * Now read the 16 bit register.  An initial 0 precedes the
2904      * register contents which begins with bit 15 (MSB) and ends
2905      * with bit 0 (LSB).  The initial 0 will be shifted off the
2906      * top of our word as we let the loop run from 0 to 16.
2907      */
2908     for (i = 0; i <= 16; i++)
2909     {
2910       temp = SEEMS | SEECS;
2911       outb(temp, SEECTL + base);
2912       CLOCK_PULSE(base);
2913       temp = temp ^ SEECK;
2914       seeprom[k] = (seeprom[k] << 1) | (inb(SEECTL + base) & SEEDI);
2915       outb(temp, SEECTL + base);
2916       CLOCK_PULSE(base);
2917     }
2918 
2919     /*
2920      * The serial EEPROM has a checksum in the last word.  Keep a
2921      * running checksum for all words read except for the last
2922      * word.  We'll verify the checksum after all words have been
2923      * read.
2924      */
2925     if (k < (sizeof(*sc) / 2) - 1)
2926     {
2927       checksum = checksum + seeprom[k];
2928     }
2929 
2930     /*
2931      * Reset the chip select for the next command cycle.
2932      */
2933     outb(SEEMS, SEECTL + base);
2934     CLOCK_PULSE(base);
2935     outb(SEEMS | SEECK, SEECTL + base);
2936     CLOCK_PULSE(base);
2937     outb(SEEMS, SEECTL + base);
2938     CLOCK_PULSE(base);
2939   }
2940 
2941   /*
2942    * Release access to the memory port and the serial EEPROM.
2943    */
2944   outb(0, SEECTL + base);
2945 
2946 #if 0
2947   printk("Computed checksum 0x%x, checksum read 0x%x\n", checksum, sc->checksum);
2948   printk("Serial EEPROM:");
2949   for (k = 0; k < (sizeof(*sc) / 2); k++)
2950   {
2951     if (((k % 8) == 0) && (k != 0))
2952     {
2953       printk("\n              ");
2954     }
2955     printk(" 0x%x", seeprom[k]);
2956   }
2957   printk("\n");
2958 #endif
2959 
2960   if (checksum != sc->checksum)
2961   {
2962     printk("aic7xxx: SEEPROM checksum error, ignoring SEEPROM settings.\n");
2963     return (0);
2964   }
2965 
2966   return (1);
2967 #undef CLOCK_PULSE
2968 }
2969 
2970 /*+F*************************************************************************
2971  * Function:
2972  *   detect_maxscb
2973  *
2974  * Description:
2975  *   Return the maximum number of SCB's allowed for a given controller.
2976  *-F*************************************************************************/
2977 static int
2978 detect_maxscb(aha_type type, int base, int walk_scbs)
     /*  */
2979 {
2980   unsigned char sblkctl_reg, scb_byte;
2981   int maxscb = 0, i;
2982 
2983   switch (type)
2984   {
2985     case AIC_7770:
2986     case AIC_7771:
2987     case AIC_284x:
2988       /*
2989        * Check for Rev C or E boards. Rev E boards can supposedly have
2990        * more than 4 SCBs, while the Rev C boards are limited to 4 SCBs.
2991        * Until we know how to access more than 4 SCBs for the Rev E chips,
2992        * we limit them, along with the Rev C chips, to 4 SCBs.
2993        *
2994        * The Rev E boards have a read/write autoflush bit in the
2995        * SBLKCTL register, while in the Rev C boards it is read only.
2996        */
2997       sblkctl_reg = inb(SBLKCTL + base) ^ AUTOFLUSHDIS;
2998       outb(sblkctl_reg, SBLKCTL + base);
2999       if (inb(SBLKCTL + base) == sblkctl_reg)
3000       {
3001         /*
3002          * We detected a Rev E board.
3003          */
3004         printk("aic7xxx: %s Rev E and subsequent.\n", board_names[type]);
3005         outb(sblkctl_reg ^ AUTOFLUSHDIS, SBLKCTL + base);
3006         maxscb = 4;
3007       }
3008       else
3009       {
3010         printk("aic7xxx: %s Rev C and previous.\n", board_names[type]);
3011         maxscb = 4;
3012       }
3013       break;
3014 
3015     case AIC_7850:
3016       maxscb = 3;
3017       break;
3018 
3019     case AIC_7870:
3020     case AIC_7871:
3021     case AIC_7874:
3022     case AIC_7880:
3023     case AIC_7881:
3024     case AIC_7884:
3025       maxscb = 16;
3026       break;
3027 
3028     case AIC_7872:
3029     case AIC_7873:
3030     case AIC_7882:
3031     case AIC_7883:
3032       /*
3033        * Is suppose to have 255 SCBs, but we'll walk the SCBs
3034        * looking for more if external RAM is detected.
3035        */
3036       maxscb = 16;
3037       break;
3038 
3039     case AIC_NONE:
3040       /*
3041        * This should never happen... But just in case.
3042        */
3043       break;
3044   }
3045 
3046   if (walk_scbs)
3047   {
3048     /*
3049      * This adapter has external SCB memory.
3050      * Walk the SCBs to determine how many there are.
3051      */
3052     i = 0;
3053     while (i < AIC7XXX_MAXSCB)
3054     {
3055       outb(i, SCBPTR + base);
3056       scb_byte = ~(inb(SCBARRAY + base));  /* complement the byte */
3057       outb(scb_byte, SCBARRAY + base);     /* write it back out */
3058       if (inb(SCBARRAY + base) != scb_byte)
3059       {
3060         break;
3061       }
3062       i++;
3063     }
3064     maxscb = i;
3065 
3066     printk("aic7xxx: Using %d SCB's after checking for SCB memory.\n", maxscb);
3067   }
3068   else
3069   {
3070     printk("aic7xxx: Using %d SCB's; No SCB memory check.\n", maxscb);
3071   }
3072 
3073   return (maxscb);
3074 }
3075 
3076 /*+F*************************************************************************
3077  * Function:
3078  *   aic7xxx_register
3079  *
3080  * Description:
3081  *   Register a Adaptec aic7xxx chip SCSI controller with the kernel.
3082  *-F*************************************************************************/
3083 static int
3084 aic7xxx_register(Scsi_Host_Template *template,
     /*  */
3085                  struct aic7xxx_host_config *config)
3086 {
3087   int i;
3088   unsigned char sblkctl;
3089   int max_targets;
3090   int found = 1, base;
3091   int bios_disabled = FALSE;
3092   unsigned char target_settings;
3093   unsigned char scsi_conf, host_conf;
3094   int have_seeprom = FALSE;
3095   struct Scsi_Host *host;
3096   struct aic7xxx_host *p;
3097   struct seeprom_config sc;
3098 
3099   base = config->base;
3100 
3101   /*
3102    * Lock out other contenders for our i/o space.
3103    */
3104   request_region(MINREG + base, MAXREG - MINREG, "aic7xxx");
3105 
3106   switch (config->type)
3107   {
3108     case AIC_7770:
3109     case AIC_7771:
3110       /*
3111        * For some 274x boards, we must clear the CHIPRST bit
3112        * and pause the sequencer. For some reason, this makes
3113        * the driver work. For 284x boards, we give it a
3114        * CHIPRST just like the 294x boards.
3115        *
3116        * Use the BIOS settings to determine the interrupt
3117        * trigger type (level or edge) and use this value
3118        * for pausing and unpausing the sequencer.
3119        */
3120       config->unpause = (inb(HCNTRL + base) & IRQMS) | INTEN;
3121       config->pause = config->unpause | PAUSE;
3122       config->extended = aic7xxx_extended;
3123 
3124       outb(config->pause | CHIPRST, HCNTRL + base);
3125       aic7xxx_delay(1);
3126       if (inb(HCNTRL + base) & CHIPRST)
3127       {
3128         printk("aic7xxx: Chip reset not cleared; clearing manually.\n");
3129       }
3130       outb(config->pause, HCNTRL + base);
3131 
3132       /*
3133        * Just to be on the safe side with the 274x, we will re-read the irq
3134        * since there was some issue about resetting the board.
3135        */
3136       config->irq = inb(INTDEF + base) & 0x0F;
3137       if ((inb(HA_274_BIOSCTRL + base) & BIOSMODE) == BIOSDISABLED)
3138       {
3139         bios_disabled = TRUE;
3140       }
3141       host_conf = inb(HOSTCONF + base);
3142       config->busrtime = host_conf & 0x3C;
3143       /* XXX Is this valid for motherboard based controllers? */
3144       /* Setup the FIFO threshold and the bus off time */
3145       outb(host_conf & DFTHRSH, BUSSPD + base);
3146       outb((host_conf << 2) & BOFF, BUSTIME + base);
3147 
3148       /*
3149        * A reminder until this can be detected automatically.
3150        */
3151       printk("aic7xxx: Extended translation %sabled.\n",
3152              config->extended ? "en" : "dis");
3153       break;
3154 
3155     case AIC_284x:
3156       outb(CHIPRST, HCNTRL + base);
3157       config->unpause = UNPAUSE_284X;
3158       config->pause = REQ_PAUSE; /* DWG would like to be like the rest */
3159       aic7xxx_delay(1);
3160       outb(config->pause, HCNTRL + base);
3161 
3162       config->extended = aic7xxx_extended;
3163       config->irq = inb(INTDEF + base) & 0x0F;
3164       if ((inb(HA_274_BIOSCTRL + base) & BIOSMODE) == BIOSDISABLED)
3165       {
3166         bios_disabled = TRUE;
3167       }
3168       host_conf = inb(HOSTCONF + base);
3169 
3170       printk("aic7xxx: Reading SEEPROM...");
3171       have_seeprom = read_2840_seeprom(base, &sc);
3172       if (!have_seeprom)
3173       {
3174         printk("aic7xxx: Unable to read SEEPROM.\n");
3175         config->busrtime = host_conf & 0x3C;
3176       }
3177       else
3178       {
3179         printk("done.\n");
3180         config->extended = ((sc.bios_control & CF284XEXTEND) >> 5);
3181         config->scsi_id = (sc.brtime_id & CFSCSIID);
3182         config->parity = (sc.adapter_control & CFSPARITY) ?
3183                          AIC_ENABLED : AIC_DISABLED;
3184         config->low_term = (sc.adapter_control & CF284XSTERM) ?
3185                               AIC_ENABLED : AIC_DISABLED;
3186         /*
3187          * XXX - Adaptec *does* make 284x wide controllers, but the
3188          *       documents do not say where the high byte termination
3189          *       enable bit is located.  For now, we'll just assume
3190          *       that it's in the same place as for the 2940 card.
3191          */
3192         config->high_term = (sc.adapter_control & CFWSTERM) ?
3193                               AIC_ENABLED : AIC_DISABLED;
3194         config->busrtime = ((sc.brtime_id & CFBRTIME) >> 8);
3195       }
3196       /* XXX Is this valid for motherboard based controllers? */
3197       /* Setup the FIFO threshold and the bus off time */
3198       outb(host_conf & DFTHRSH, BUSSPD + base);
3199       outb((host_conf << 2) & BOFF, BUSTIME + base);
3200 
3201       printk("aic7xxx: Extended translation %sabled.\n",
3202              config->extended ? "en" : "dis");
3203       break;
3204 
3205     case AIC_7850:
3206     case AIC_7870:
3207     case AIC_7871:
3208     case AIC_7872:
3209     case AIC_7873:
3210     case AIC_7874:
3211     case AIC_7880:
3212     case AIC_7881:
3213     case AIC_7882:
3214     case AIC_7883:
3215     case AIC_7884:
3216       outb(CHIPRST, HCNTRL + base);
3217       config->unpause = UNPAUSE_294X;
3218       config->pause = config->unpause | PAUSE;
3219       aic7xxx_delay(1);
3220       outb(config->pause, HCNTRL + base);
3221 
3222       config->extended = aic7xxx_extended;
3223       config->scsi_id = 7;
3224 
3225       printk("aic7xxx: Reading SEEPROM...");
3226       have_seeprom = read_seeprom(base, config->chan_num * (sizeof(sc) / 2), &sc);
3227       if (!have_seeprom)
3228       {
3229         printk("aic7xxx: Unable to read SEEPROM.\n");
3230       }
3231       else
3232       {
3233         printk("done.\n");
3234         config->extended = ((sc.bios_control & CFEXTEND) >> 7);
3235         config->scsi_id = (sc.brtime_id & CFSCSIID);
3236         config->parity = (sc.adapter_control & CFSPARITY) ?
3237                          AIC_ENABLED : AIC_DISABLED;
3238         config->low_term = (sc.adapter_control & CFSTERM) ?
3239                               AIC_ENABLED : AIC_DISABLED;
3240         config->high_term = (sc.adapter_control & CFWSTERM) ?
3241                               AIC_ENABLED : AIC_DISABLED;
3242         config->busrtime = ((sc.brtime_id & CFBRTIME) >> 8);
3243         if (((config->type == AIC_7880) || (config->type == AIC_7882) ||
3244              (config->type == AIC_7883) || (config->type == AIC_7884)) &&
3245             (sc.adapter_control & CFULTRAEN))
3246         {
3247           printk ("aic7xxx: Enabling support for Ultra SCSI speed.\n");
3248           config->ultra_enabled = TRUE;
3249         }
3250       }
3251 
3252       /*
3253        * XXX - force data fifo threshold to 100%. Why does this
3254        *       need to be done?
3255        *
3256        * We don't know where this is set in the SEEPROM or by the BIOS,
3257        * so we default it to 100%.
3258        */
3259       outb(config->scsi_id | DFTHRSH_100, SCSICONF + base);
3260       outb(DFTHRSH_100, DSPCISTATUS + base);
3261 
3262       /*
3263        * In case we are a wide card, place scsi ID in second conf byte.
3264        */
3265       outb(config->scsi_id, (SCSICONF + base + 1));
3266 
3267       printk("aic7xxx: Extended translation %sabled.\n",
3268              config->extended ? "en" : "dis");
3269       break;
3270 
3271     default:
3272       panic("aic7xxx: (aic7xxx_register) Internal error.\n");
3273   }
3274 
3275   config->maxscb = detect_maxscb(config->type, base, config->walk_scbs);
3276 
3277   if (config->chip_type == AIC_777x)
3278   {
3279     if (config->pause & IRQMS)
3280     {
3281       printk("aic7xxx: Using level sensitive interrupts.\n");
3282     }
3283     else
3284     {
3285       printk("aic7xxx: Using edge triggered interrupts.\n");
3286     }
3287   }
3288 
3289   /*
3290    * Read the bus type from the SBLKCTL register. Set the FLAGS
3291    * register in the sequencer for twin and wide bus cards.
3292    */
3293   sblkctl = inb(SBLKCTL + base);
3294   switch (sblkctl & SELBUS_MASK)
3295   {
3296     case SELNARROW:     /* narrow/normal bus */
3297       config->scsi_id = inb(SCSICONF + base) & 0x07;
3298       config->bus_type = AIC_SINGLE;
3299       outb(SINGLE_BUS, FLAGS + base);
3300       break;
3301 
3302     case SELWIDE:     /* Wide bus */
3303       config->scsi_id = inb(SCSICONF + base + 1) & 0x0F;
3304       config->bus_type = AIC_WIDE;
3305       printk("aic7xxx: Enabling wide channel of %s-Wide.\n",
3306              board_names[config->type]);
3307       outb(WIDE_BUS, FLAGS + base);
3308       break;
3309 
3310     case SELBUSB:     /* Twin bus */
3311       config->scsi_id = inb(SCSICONF + base) & 0x07;
3312 #ifdef AIC7XXX_TWIN_SUPPORT
3313       config->scsi_id_b = inb(SCSICONF + base + 1) & 0x07;
3314       config->bus_type = AIC_TWIN;
3315       printk("aic7xxx: Enabled channel B of %s-Twin.\n",
3316              board_names[config->type]);
3317       outb(TWIN_BUS, FLAGS + base);
3318 #else
3319       config->bus_type = AIC_SINGLE;
3320       printk("aic7xxx: Channel B of %s-Twin will be ignored.\n",
3321              board_names[config->type]);
3322       outb(0, FLAGS + base);
3323 #endif
3324       break;
3325 
3326     default:
3327       printk("aic7xxx: Unsupported type 0x%x, please "
3328              "mail deang@ims.com\n", inb(SBLKCTL + base));
3329       outb(0, FLAGS + base);
3330       return (0);
3331   }
3332 
3333   /*
3334    * For the 294x cards, clearing DIAGLEDEN and DIAGLEDON, will
3335    * take the card out of diagnostic mode and make the host adatper
3336    * LED follow bus activity (will not always be on).
3337    */
3338   outb(sblkctl & ~(DIAGLEDEN | DIAGLEDON), SBLKCTL + base);
3339 
3340   /*
3341    * The IRQ level in i/o port 4 maps directly onto the real
3342    * IRQ number. If it's ok, register it with the kernel.
3343    *
3344    * NB. the Adaptec documentation says the IRQ number is only
3345    *     in the lower four bits; the ECU information shows the
3346    *     high bit being used as well. Which is correct?
3347    *
3348    * The PCI cards get their interrupt from PCI BIOS.
3349    */
3350   if ((config->chip_type == AIC_777x) && ((config->irq < 9) || (config->irq > 15)))
3351   {
3352     printk("aic7xxx: Host adapter uses unsupported IRQ level, ignoring.\n");
3353     return (0);
3354   }
3355 
3356   /*
3357    * Check the IRQ to see if it is shared by another aic7xxx
3358    * controller. If it is and sharing of IRQs is not defined,
3359    * then return 0 hosts found. If sharing of IRQs is allowed
3360    * or the IRQ is not shared by another host adapter, then
3361    * proceed.
3362    */
3363 #ifndef AIC7XXX_SHARE_IRQS
3364    if (aic7xxx_boards[config->irq] != NULL)
3365    {
3366      printk("aic7xxx: Sharing of IRQ's is not configured.\n");
3367      return (0);
3368    }
3369 #endif
3370 
3371   /*
3372    * Print out debugging information before re-enabling
3373    * the card - a lot of registers on it can't be read
3374    * when the sequencer is active.
3375    */
3376   debug_config(config);
3377 
3378   /*
3379    * Before registry, make sure that the offsets of the
3380    * struct scatterlist are what the sequencer will expect,
3381    * otherwise disable scatter-gather altogether until someone
3382    * can fix it. This is important since the sequencer will
3383    * DMA elements of the SG array in while executing commands.
3384    */
3385   if (template->sg_tablesize != SG_NONE)
3386   {
3387     struct scatterlist sg;
3388 
3389     if (SG_STRUCT_CHECK(sg))
3390     {
3391       printk("aic7xxx: Warning - Kernel scatter-gather structures changed, "
3392              "disabling it.\n");
3393       template->sg_tablesize = SG_NONE;
3394     }
3395   }
3396 
3397   /*
3398    * Register each "host" and fill in the returned Scsi_Host
3399    * structure as best we can. Some of the parameters aren't
3400    * really relevant for bus types beyond ISA, and none of the
3401    * high-level SCSI code looks at it anyway. Why are the fields
3402    * there? Also save the pointer so that we can find the
3403    * information when an IRQ is triggered.
3404    */
3405   host = scsi_register(template, sizeof(struct aic7xxx_host));
3406   host->can_queue = config->maxscb;
3407   host->cmd_per_lun = AIC7XXX_CMDS_PER_LUN;
3408   host->this_id = config->scsi_id;
3409   host->irq = config->irq;
3410   if (config->bus_type == AIC_WIDE)
3411   {
3412     host->max_id = 16;
3413   }
3414   if (config->bus_type == AIC_TWIN)
3415   {
3416     host->max_channel = 1;
3417   }
3418 
3419   p = (struct aic7xxx_host *) host->hostdata;
3420 
3421   /*
3422    * Initialize the scb array by setting the state to free.
3423    */
3424   for (i = 0; i < AIC7XXX_MAXSCB; i++)
3425   {
3426     p->scb_array[i].state = SCB_FREE;
3427     p->scb_array[i].next = NULL;
3428     p->scb_array[i].cmd = NULL;
3429   }
3430 
3431   p->isr_count = 0;
3432   p->a_scanned = FALSE;
3433   p->b_scanned = FALSE;
3434   p->base = base;
3435   p->maxscb = config->maxscb;
3436   p->numscb = 0;
3437   p->extended = config->extended;
3438   p->type = config->type;
3439   p->chip_type = config->chip_type;
3440   p->ultra_enabled = config->ultra_enabled;
3441   p->chan_num = config->chan_num;
3442   p->bus_type = config->bus_type;
3443   p->have_seeprom = have_seeprom;
3444   p->seeprom = sc;
3445   p->free_scb = NULL;
3446   p->next = NULL;
3447 
3448   p->unpause = config->unpause;
3449   p->pause = config->pause;
3450 
3451   if (aic7xxx_boards[config->irq] == NULL)
3452   {
3453     /*
3454      * Warning! This must be done before requesting the irq.  It is
3455      * possible for some boards to raise an interrupt as soon as
3456      * they are enabled.  So when we request the irq from the Linux
3457      * kernel, an interrupt is triggered immediately.  Therefore, we
3458      * must ensure the board data is correctly set before the request.
3459      */
3460     aic7xxx_boards[config->irq] = host;
3461 
3462     /*
3463      * Register IRQ with the kernel.
3464      */
3465     if (request_irq(config->irq, aic7xxx_isr, SA_INTERRUPT, "aic7xxx", NULL))
3466     {
3467       printk("aic7xxx: Couldn't register IRQ %d, ignoring.\n", config->irq);
3468       aic7xxx_boards[config->irq] = NULL;
3469       return (0);
3470     }
3471   }
3472   else
3473   {
3474     /*
3475      * We have found a host adapter sharing an IRQ of a previously
3476      * registered host adapter. Add this host adapter's Scsi_Host
3477      * to the beginning of the linked list of hosts at the same IRQ.
3478      */
3479     p->next = aic7xxx_boards[config->irq];
3480     aic7xxx_boards[config->irq] = host;
3481   }
3482 
3483   /*
3484    * Load the sequencer program, then re-enable the board -
3485    * resetting the AIC-7770 disables it, leaving the lights
3486    * on with nobody home. On the PCI bus you *may* be home,
3487    * but then your mailing address is dynamically assigned
3488    * so no one can find you anyway :-)
3489    */
3490   printk("aic7xxx: Downloading sequencer code...");
3491   aic7xxx_loadseq(base);
3492 
3493   /*
3494    * Set Fast Mode and Enable the board
3495    */
3496   outb(FASTMODE, SEQCTL + base);
3497 
3498   if (p->chip_type == AIC_777x)
3499   {
3500     outb(ENABLE, BCTL + base);
3501   }
3502 
3503   printk("done.\n");
3504 
3505   /*
3506    * Set the SCSI Id, SXFRCTL0, SXFRCTL1, and SIMODE1, for both channels
3507    */
3508   if (p->bus_type == AIC_TWIN)
3509   {
3510     /*
3511      * Select Channel B.
3512      */
3513     outb((sblkctl & ~SELBUS_MASK) | SELBUSB, SBLKCTL + base);
3514 
3515     outb(config->scsi_id_b, SCSIID + base);
3516     scsi_conf = inb(SCSICONF + base + 1) & (ENSPCHK | STIMESEL);
3517     outb(scsi_conf | ENSTIMER | ACTNEGEN | STPWEN, SXFRCTL1 + base);
3518     outb(ENSELTIMO , SIMODE1 + base);
3519     if (p->ultra_enabled)
3520     {
3521       outb(DFON | SPIOEN | ULTRAEN, SXFRCTL0 + base);
3522     }
3523     else
3524     {
3525       outb(DFON | SPIOEN, SXFRCTL0 + base);
3526     }
3527 
3528     /*
3529      * Select Channel A
3530      */
3531     outb((sblkctl & ~SELBUS_MASK) | SELNARROW, SBLKCTL + base);
3532   }
3533   outb(config->scsi_id, SCSIID + base);
3534   scsi_conf = inb(SCSICONF + base) & (ENSPCHK | STIMESEL);
3535   outb(scsi_conf | ENSTIMER | ACTNEGEN | STPWEN, SXFRCTL1 + base);
3536   outb(ENSELTIMO , SIMODE1 + base);
3537   if (p->ultra_enabled)
3538   {
3539     outb(DFON | SPIOEN | ULTRAEN, SXFRCTL0 + base);
3540   }
3541   else
3542   {
3543     outb(DFON | SPIOEN, SXFRCTL0 + base);
3544   }
3545 
3546   /*
3547    * Look at the information that board initialization or the board
3548    * BIOS has left us. In the lower four bits of each target's
3549    * scratch space any value other than 0 indicates that we should
3550    * initiate synchronous transfers. If it's zero, the user or the
3551    * BIOS has decided to disable synchronous negotiation to that
3552    * target so we don't activate the needsdtr flag.
3553    */
3554   p->needsdtr_copy = 0x0;
3555   p->sdtr_pending = 0x0;
3556   p->needwdtr_copy = 0x0;
3557   p->wdtr_pending = 0x0;
3558   if (p->bus_type == AIC_SINGLE)
3559   {
3560     max_targets = 8;
3561   }
3562   else
3563   {
3564     max_targets = 16;
3565   }
3566 
3567   /*
3568    * Grab the disconnection disable table and invert it for our needs
3569    */
3570   if (have_seeprom)
3571   {
3572     p->discenable = 0x0;
3573   }
3574   else
3575   {
3576     if (bios_disabled)
3577     {
3578       printk("aic7xxx : Host adapter BIOS disabled. Using default SCSI "
3579              "device parameters.\n");
3580       p->discenable = 0xFFFF;
3581     }
3582     else
3583     {
3584       p->discenable = ~((inb(DISC_DSB + base + 1) << 8) |
3585           inb(DISC_DSB + base));
3586     }
3587   }
3588 
3589   for (i = 0; i < max_targets; i++)
3590   {
3591     if (have_seeprom)
3592     {
3593       target_settings = ((sc.device_flags[i] & CFXFER) << 4);
3594       if (sc.device_flags[i] & CFSYNCH)
3595       {
3596         p->needsdtr_copy |= (0x01 << i);
3597       }
3598       if (sc.device_flags[i] & CFWIDEB)
3599       {
3600         p->needwdtr_copy |= (0x01 << i);
3601       }
3602       if (sc.device_flags[i] & CFDISC)
3603       {
3604         p->discenable |= (0x01 << i);
3605       }
3606     }
3607     else
3608     {
3609       if (bios_disabled)
3610       {
3611         target_settings = 0;  /* 10 MHz */
3612         p->needsdtr_copy |= (0x01 << i);
3613         p->needwdtr_copy |= (0x01 << i);
3614       }
3615       else
3616       {
3617         target_settings = inb(TARG_SCRATCH + base + i);
3618         if (target_settings & 0x0F)
3619         {
3620           p->needsdtr_copy |= (0x01 << i);
3621           /*
3622            * Default to asynchronous transfers (0 offset)
3623            */
3624           target_settings &= 0xF0;
3625         }
3626         if (target_settings & 0x80)
3627         {
3628           p->needwdtr_copy |= (0x01 << i);
3629           target_settings &= 0x7F;
3630         }
3631       }
3632     }
3633     outb(target_settings, (TARG_SCRATCH + base + i));
3634   }
3635 
3636   /*
3637    * If we are not wide, forget WDTR. This makes the driver
3638    * work on some cards that don't leave these fields cleared
3639    * when BIOS is not installed.
3640    */
3641   if (p->bus_type != AIC_WIDE)
3642   {
3643     p->needwdtr = 0;
3644   }
3645   p->needsdtr = p->needsdtr_copy;
3646   p->needwdtr = p->needwdtr_copy;
3647 #if 0
3648   printk("NeedSdtr = 0x%x, 0x%x\n", p->needsdtr_copy, p->needsdtr);
3649   printk("NeedWdtr = 0x%x, 0x%x\n", p->needwdtr_copy, p->needwdtr);
3650 #endif
3651 
3652   /*
3653    * Clear the control byte for every SCB so that the sequencer
3654    * doesn't get confused and think that one of them is valid
3655    */
3656   for (i = 0; i < config->maxscb; i++)
3657   {
3658     outb(i, SCBPTR + base);
3659     outb(0, SCBARRAY + base);
3660   }
3661 
3662   /*
3663    * For reconnecting targets, the sequencer code needs to
3664    * know how many SCBs it has to search through.
3665    */
3666   outb(config->maxscb, SCBCOUNT + base);
3667 
3668   /*
3669    * 2s compliment of SCBCOUNT
3670    */
3671   i = p->maxscb;
3672   outb(-i & 0xff, COMP_SCBCOUNT + base);
3673 
3674   /*
3675    * Clear the active flags - no targets are busy.
3676    */
3677   outb(0, ACTIVE_A + base);
3678   outb(0, ACTIVE_B + base);
3679 
3680   /*
3681    * We don't have any waiting selections
3682    */
3683   outb(SCB_LIST_NULL, WAITING_SCBH + base);
3684   outb(SCB_LIST_NULL, WAITING_SCBT + base);
3685 
3686   /*
3687    * Reset the SCSI bus. Is this necessary?
3688    *   There may be problems for a warm boot without resetting
3689    *   the SCSI bus. Either BIOS settings in scratch RAM
3690    *   will not get reinitialized, or devices may stay at
3691    *   previous negotiated settings (SDTR and WDTR) while
3692    *   the driver will think that no negotiations have been
3693    *   performed.
3694    *
3695    * Some devices need a long time to "settle" after a SCSI
3696    * bus reset.
3697    */
3698 
3699   if (!aic7xxx_no_reset)
3700   {
3701     printk("aic7xxx: Resetting the SCSI bus...");
3702     if (p->bus_type == AIC_TWIN)
3703     {
3704       /*
3705        * Select Channel B.
3706        */
3707       outb((sblkctl & ~SELBUS_MASK) | SELBUSB, SBLKCTL + base);
3708 
3709       outb(SCSIRSTO, SCSISEQ + base);
3710       udelay(1000);
3711       outb(0, SCSISEQ + base);
3712 
3713       /*
3714        * Select Channel A.
3715        */
3716       outb((sblkctl & ~SELBUS_MASK) | SELNARROW, SBLKCTL + base);
3717     }
3718 
3719     outb(SCSIRSTO, SCSISEQ + base);
3720     udelay(1000);
3721     outb(0, SCSISEQ + base);
3722 
3723     aic7xxx_delay(AIC7XXX_RESET_DELAY);
3724 
3725     printk("done.\n");
3726   }
3727 
3728   /*
3729    * Unpause the sequencer before returning and enable
3730    * interrupts - we shouldn't get any until the first
3731    * command is sent to us by the high-level SCSI code.
3732    */
3733   UNPAUSE_SEQUENCER(p);
3734   return (found);
3735 }
3736 
3737 /*+F*************************************************************************
3738  * Function:
3739  *   aic7xxx_detect
3740  *
3741  * Description:
3742  *   Try to detect and register an Adaptec 7770 or 7870 SCSI controller.
3743  *-F*************************************************************************/
3744 int
3745 aic7xxx_detect(Scsi_Host_Template *template)
     /*  */
3746 {
3747   int found = 0, slot, base;
3748   unsigned char irq = 0;
3749   int i;
3750   struct aic7xxx_host_config config;
3751 
3752   template->proc_dir = &proc_scsi_aic7xxx;
3753   config.chan_num = 0;
3754 
3755   /*
3756    * Since we may allow sharing of IRQs, it is imperative
3757    * that we "null-out" the aic7xxx_boards array. It is
3758    * not guaranteed to be initialized to 0 (NULL). We use
3759    * a NULL entry to indicate that no prior hosts have
3760    * been found/registered for that IRQ.
3761    */
3762   for (i = 0; i <= MAXIRQ; i++)
3763   {
3764     aic7xxx_boards[i] = NULL;
3765   }
3766 
3767   /*
3768    * Initialize the spurious count to 0.
3769    */
3770   aic7xxx_spurious_count = 0;
3771 
3772   /*
3773    * EISA/VL-bus card signature probe.
3774    */
3775   for (slot = MINSLOT; slot <= MAXSLOT; slot++)
3776   {
3777     base = SLOTBASE(slot) + MINREG;
3778 
3779     if (check_region(MINREG + base, MAXREG - MINREG))
3780     {
3781       /*
3782        * Some other driver has staked a
3783        * claim to this i/o region already.
3784        */
3785       continue;
3786     }
3787 
3788     config.type = aic7xxx_probe(slot, HID0 + base);
3789     if (config.type != AIC_NONE)
3790     {
3791       /*
3792        * We found a card, allow 1 spurious interrupt.
3793        */
3794       aic7xxx_spurious_count = 1;
3795 
3796       /*
3797        * We "find" a AIC-7770 if we locate the card
3798        * signature and we can set it up and register
3799        * it with the kernel without incident.
3800        */
3801       config.chip_type = AIC_777x;
3802       config.base = base;
3803       config.irq = irq;
3804       config.parity = AIC_UNKNOWN;
3805       config.low_term = AIC_UNKNOWN;
3806       config.high_term = AIC_UNKNOWN;
3807       config.busrtime = 0;
3808       config.walk_scbs = FALSE;
3809       config.ultra_enabled = FALSE;
3810       found += aic7xxx_register(template, &config);
3811 
3812       /*
3813        * Disallow spurious interrupts.
3814        */
3815       aic7xxx_spurious_count = 0;
3816     }
3817   }
3818 
3819 #ifdef CONFIG_PCI
3820   /*
3821    * PCI-bus probe.
3822    */
3823   if (pcibios_present())
3824   {
3825     struct
3826     {
3827       unsigned short vendor_id;
3828       unsigned short device_id;
3829       aha_type       card_type;
3830       aha_chip_type  chip_type;
3831     } const aic7xxx_pci_devices[] = {
3832       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7850, AIC_7850, AIC_785x},
3833       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7870, AIC_7870, AIC_787x},
3834       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7871, AIC_7871, AIC_787x},
3835       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7872, AIC_7872, AIC_787x},
3836       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7873, AIC_7873, AIC_787x},
3837       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7874, AIC_7874, AIC_787x},
3838       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7880, AIC_7880, AIC_788x},
3839       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7881, AIC_7881, AIC_788x},
3840       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7882, AIC_7882, AIC_788x},
3841       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7883, AIC_7883, AIC_788x},
3842       {PCI_VENDOR_ID_ADAPTEC, PCI_DEVICE_ID_ADAPTEC_7884, AIC_7884, AIC_788x}
3843     };
3844 
3845     int error;
3846     int done = 0;
3847     unsigned int io_port;
3848     unsigned short index = 0;
3849     unsigned char pci_bus, pci_device_fn;
3850     unsigned int  csize_lattime;
3851     unsigned int  class_revid;
3852     unsigned int  devconfig;
3853     char rev_id[] = {'B', 'C', 'D'};
3854 
3855     for (i = 0; i < NUMBER(aic7xxx_pci_devices); i++)
3856     {
3857       done = FALSE;
3858       while (!done)
3859       {
3860         if (pcibios_find_device(aic7xxx_pci_devices[i].vendor_id,
3861                                 aic7xxx_pci_devices[i].device_id,
3862                                 index, &pci_bus, &pci_device_fn))
3863         {
3864           done = TRUE;
3865         }
3866         else  /* Found an Adaptec PCI device. */
3867         {
3868           config.type = aic7xxx_pci_devices[i].card_type;
3869           config.chip_type = aic7xxx_pci_devices[i].chip_type;
3870           config.chan_num = 0;
3871           config.walk_scbs = FALSE;
3872           switch (config.type)
3873           {
3874             case AIC_7872:  /* 3940 */
3875             case AIC_7882:  /* 3940-Ultra */
3876               config.walk_scbs = TRUE;
3877               config.chan_num = number_of_39xxs & 0x1;  /* Has 2 controllers */
3878               number_of_39xxs++;
3879               if (number_of_39xxs == 2)
3880               {
3881                 number_of_39xxs = 0;  /* To be consistent with 3985. */
3882               }
3883               break;
3884 
3885             case AIC_7873:  /* 3985 */
3886             case AIC_7883:  /* 3985-Ultra */
3887               config.chan_num = number_of_39xxs & 0x3;  /* Has 3 controllers */
3888               number_of_39xxs++;
3889               if (number_of_39xxs == 3)
3890               {
3891                 number_of_39xxs = 0;
3892               }
3893               break;
3894 
3895             default:
3896               break;
3897           }
3898 
3899           /*
3900            * Read esundry information from PCI BIOS.
3901            */
3902           error = pcibios_read_config_dword(pci_bus, pci_device_fn,
3903                                             PCI_BASE_ADDRESS_0, &io_port);
3904           error += pcibios_read_config_byte(pci_bus, pci_device_fn,
3905                                             PCI_INTERRUPT_LINE, &irq);
3906 
3907           /*
3908            * Ensure that we are using good values for the PCI burst size
3909            * and latency timer.
3910            */
3911           error += pcibios_read_config_dword(pci_bus, pci_device_fn,
3912                                              CSIZE_LATTIME, &csize_lattime);
3913           if ((csize_lattime & CACHESIZE) == 0)
3914           {
3915             /* Default to 8DWDs - what's the PCI define for this? */
3916             csize_lattime |= 8;
3917           }
3918           if((csize_lattime & LATTIME) == 0)
3919           {
3920             /* Default to 64 PCLKS (is this a good value?) */
3921             /* This may also be availble in the SEEPROM?? */
3922             csize_lattime |= (64 << 8);
3923           }
3924           pcibios_write_config_dword(pci_bus, pci_device_fn,
3925                                      CSIZE_LATTIME, csize_lattime);
3926           printk("aic7xxx: BurstLen = %d DWDs, Latency Timer = %d PCLKS\n",
3927                   (int) (csize_lattime & CACHESIZE),
3928                   (csize_lattime >> 8) & 0x000000ff);
3929 
3930           error += pcibios_read_config_dword(pci_bus, pci_device_fn,
3931                                              CLASS_PROGIF_REVID, &class_revid);
3932           if ((class_revid & DEVREVID) < 3)
3933           {
3934             printk("aic7xxx: %s Rev %c.\n", board_names[config.type],
3935                    rev_id[class_revid & DEVREVID]);
3936           }
3937 
3938           error += pcibios_read_config_dword(pci_bus, pci_device_fn,
3939                                              DEVCONFIG, &devconfig);
3940           if (error)
3941           {
3942             panic("aic7xxx: (aic7xxx_detect) Error %d reading PCI registers.\n",
3943                   error);
3944           }
3945 
3946           printk("aic7xxx: devconfig = 0x%x.\n", devconfig);
3947 
3948           /*
3949            * The first bit of PCI_BASE_ADDRESS_0 is always set, so
3950            * we mask it off.
3951            */
3952           base = io_port & 0xfffffffe;
3953 
3954           /*
3955            * I don't think we need to bother with allowing
3956            * spurious interrupts for the 787x/7850, but what
3957            * the hey.
3958            */
3959           aic7xxx_spurious_count = 1;
3960 
3961           config.base = base;
3962           config.irq = irq;
3963           config.parity = AIC_UNKNOWN;
3964           config.low_term = AIC_UNKNOWN;
3965           config.high_term = AIC_UNKNOWN;
3966           config.busrtime = 0;
3967           config.ultra_enabled = FALSE;
3968           if (devconfig & RAMPSM)
3969           {
3970             /*
3971              * External SRAM present.  Have the probe walk the SCBs to see
3972              * how much SRAM we have and set the number of SCBs accordingly.
3973              * We have to turn off SCBRAMSEL to access the external SCB
3974              * SRAM.
3975              *
3976              * It seems that early versions of the aic7870 didn't use these
3977              * bits, hence the hack for the 3940 above.  I would guess that
3978              * recent 3940s using later aic7870 or aic7880 chips do actually
3979              * set RAMPSM.
3980              *
3981              * The documentation isn't clear, but it sounds like the value
3982              * written to devconfig must not have RAMPSM set.  The second
3983              * sixteen bits of the register are R/O anyway, so it shouldn't
3984              * affect RAMPSM either way.
3985              */
3986             printk ("aic7xxx: External RAM detected. Enabling RAM access.\n");
3987             devconfig &= ~(RAMPSM | SCBRAMSEL);
3988             pcibios_write_config_dword(pci_bus, pci_device_fn,
3989                                        DEVCONFIG, devconfig);
3990             config.walk_scbs = TRUE;
3991           }
3992           found += aic7xxx_register(template, &config);
3993 
3994           /*
3995            * Disable spurious interrupts.
3996            */
3997           aic7xxx_spurious_count = 0;
3998 
3999           index++;
4000         }  /* Found an Adaptec PCI device. */
4001       }
4002     }
4003   }
4004 #endif CONFIG_PCI
4005 
4006   template->name = aic7xxx_info(NULL);
4007   return (found);
4008 }
4009 
4010 
4011 /*+F*************************************************************************
4012  * Function:
4013  *   aic7xxx_buildscb
4014  *
4015  * Description:
4016  *   Build a SCB.
4017  *-F*************************************************************************/
4018 static void
4019 aic7xxx_buildscb(struct aic7xxx_host *p,
     /*  */
4020                  Scsi_Cmnd *cmd,
4021                  struct aic7xxx_scb *scb)
4022 {
4023   void *addr;
4024   unsigned short mask;
4025   struct scatterlist *sg;
4026 
4027   /*
4028    * Setup the control byte if we need negotiation and have not
4029    * already requested it.
4030    */
4031 #ifdef AIC7XXX_TAGGED_QUEUEING
4032   if (cmd->device->tagged_supported)
4033   {
4034     if (cmd->device->tagged_queue == 0)
4035     {
4036       printk("aic7xxx: Enabling tagged queuing for target %d, "
4037              "channel %d.\n", cmd->target, cmd->channel);
4038       cmd->device->tagged_queue = 1;
4039       cmd->device->current_tag = 1;  /* enable tagging */
4040     }
4041     cmd->tag = cmd->device->current_tag;
4042     cmd->device->current_tag++;
4043     scb->control |= TAG_ENB;
4044   }
4045 #endif
4046   mask = (0x01 << (cmd->target | (cmd->channel << 3)));
4047   if (p->discenable & mask)
4048   {
4049     scb->control |= DISCENB;
4050   }
4051   if ((p->needwdtr & mask) && !(p->wdtr_pending & mask))
4052   {
4053     p->wdtr_pending |= mask;
4054     scb->control |= NEEDWDTR;
4055 #if 0
4056     printk("aic7xxx: Sending WDTR request to target %d.\n", cmd->target);
4057 #endif
4058   }
4059   else
4060   {
4061     if ((p->needsdtr & mask) && !(p->sdtr_pending & mask))
4062     {
4063       p->sdtr_pending |= mask;
4064       scb->control |= NEEDSDTR;
4065 #if 0
4066       printk("aic7xxx: Sending SDTR request to target %d.\n", cmd->target);
4067 #endif
4068     }
4069   }
4070 
4071 #if 0
4072   printk("aic7xxx: (build_scb) Target %d, cmd(0x%x) size(%u) wdtr(0x%x) "
4073          "mask(0x%x).\n",
4074          cmd->target, cmd->cmnd[0], cmd->cmd_len, p->needwdtr, mask);
4075 #endif
4076   scb->target_channel_lun = ((cmd->target << 4) & 0xF0) |
4077         ((cmd->channel & 0x01) << 3) | (cmd->lun & 0x07);
4078 
4079   /*
4080    * The interpretation of request_buffer and request_bufflen
4081    * changes depending on whether or not use_sg is zero; a
4082    * non-zero use_sg indicates the number of elements in the
4083    * scatter-gather array.
4084    */
4085 
4086   /*
4087    * XXX - this relies on the host data being stored in a
4088    *       little-endian format.
4089    */
4090   addr = cmd->cmnd;
4091   scb->SCSI_cmd_length = cmd->cmd_len;
4092   memcpy(scb->SCSI_cmd_pointer, &addr, sizeof(scb->SCSI_cmd_pointer));
4093 
4094   if (cmd->use_sg)
4095   {
4096     scb->SG_segment_count = cmd->use_sg;
4097     memcpy(scb->SG_list_pointer, &cmd->request_buffer,
4098            sizeof(scb->SG_list_pointer));
4099     memcpy(&sg, &cmd->request_buffer, sizeof(sg));
4100     memcpy(scb->data_pointer, &(sg[0].address), sizeof(scb->data_pointer));
4101     scb->data_count = sg[0].length;
4102 #if 0
4103     debug("aic7xxx: (build_scb) SG segs(%d), length(%u), sg[0].length(%d).\n",
4104            cmd->use_sg, aic7xxx_length(cmd, 0), scb->data_count);
4105 #endif
4106   }
4107   else
4108   {
4109 #if 0
4110   debug("aic7xxx: (build_scb) Creating scatterlist, addr(0x%lx) length(%d).\n",
4111         (unsigned long) cmd->request_buffer, cmd->request_bufflen);
4112 #endif
4113     if (cmd->request_bufflen == 0)
4114     {
4115       /*
4116        * In case the higher level SCSI code ever tries to send a zero
4117        * length command, ensure the SCB indicates no data.  The driver
4118        * will interpret a zero length command as a Bus Device Reset.
4119        */
4120       scb->SG_segment_count = 0;
4121       memset(scb->SG_list_pointer, 0, sizeof(scb->SG_list_pointer));
4122       memset(scb->data_pointer, 0, sizeof(scb->data_pointer));
4123       scb->data_count = 0;
4124     }
4125     else
4126     {
4127       scb->SG_segment_count = 1;
4128       scb->sg.address = (char *) cmd->request_buffer;
4129       scb->sg.length = cmd->request_bufflen;
4130       addr = &scb->sg;
4131       memcpy(scb->SG_list_pointer, &addr, sizeof(scb->SG_list_pointer));
4132       scb->data_count = scb->sg.length;
4133       memcpy(scb->data_pointer, &cmd->request_buffer, sizeof(scb->data_pointer));
4134     }
4135   }
4136 }
4137 
4138 /*+F*************************************************************************
4139  * Function:
4140  *   aic7xxx_queue
4141  *
4142  * Description:
4143  *   Queue a SCB to the controller.
4144  *-F*************************************************************************/
4145 int
4146 aic7xxx_queue(Scsi_Cmnd *cmd, void (*fn)(Scsi_Cmnd *))
     /*  */
4147 {
4148   long flags;
4149   struct aic7xxx_host *p;
4150   struct aic7xxx_scb *scb;
4151 
4152   p = (struct aic7xxx_host *) cmd->host->hostdata;
4153 
4154   /*
4155    * Check to see if channel was scanned.
4156    */
4157   if (!p->a_scanned && (cmd->channel == 0))
4158   {
4159     printk("aic7xxx: Scanning channel A for devices.\n");
4160     p->a_scanned = TRUE;
4161   }
4162   else
4163   {
4164     if (!p->b_scanned && (cmd->channel == 1))
4165     {
4166       printk("aic7xxx: Scanning channel B for devices.\n");
4167       p->b_scanned = TRUE;
4168     }
4169   }
4170 
4171 #if 0
4172   debug("aic7xxx: (queue) cmd(0x%x) size(%u), target %d, channel %d, lun %d.\n",
4173         cmd->cmnd[0], cmd->cmd_len, cmd->target, cmd->channel,
4174         cmd->lun & 0x07);
4175 #endif
4176 
4177   /*
4178    * This is a critical section, since we don't want the
4179    * interrupt routine mucking with the host data or the
4180    * card. Since the kernel documentation is vague on
4181    * whether or not we are in a cli/sti pair already, save
4182    * the flags to be on the safe side.
4183    */
4184   save_flags(flags);
4185   cli();
4186 
4187   /*
4188    * Find a free slot in the SCB array to load this command
4189    * into. Since can_queue is set to the maximum number of
4190    * SCBs for the card, we should always find one.
4191    *
4192    * First try to find an scb in the free list. If there are
4193    * none in the free list, then check the current number of
4194    * of scbs and take an unused one from the scb array.
4195    */
4196   scb = p->free_scb;
4197   if (scb != NULL)
4198   { /* found one in the free list */
4199     p->free_scb = scb->next;   /* remove and update head of list */
4200     /*
4201      * Warning! For some unknown reason, the scb at the head
4202      * of the free list is not the same address that it should
4203      * be. That's why we set the scb pointer taken by the
4204      * position in the array. The scb at the head of the list
4205      * should match this address, but it doesn't.
4206      */
4207     scb = &(p->scb_array[scb->position]);
4208     scb->control = 0;
4209     scb->state = SCB_ACTIVE;
4210   }
4211   else
4212   {
4213     if (p->numscb >= p->maxscb)
4214     {
4215       panic("aic7xxx: (aic7xxx_queue) Couldn't find a free SCB.\n");
4216     }
4217     else
4218     {
4219       /*
4220        * Initialize the scb within the scb array. The
4221        * position within the array is the position on
4222        * the board that it will be loaded.
4223        */
4224       scb = &(p->scb_array[p->numscb]);
4225       memset(scb, 0, sizeof(*scb));
4226 
4227       scb->position = p->numscb;
4228       p->numscb++;
4229       scb->state = SCB_ACTIVE;
4230     }
4231   }
4232 
4233   scb->cmd = cmd;
4234   aic7xxx_position(cmd) = scb->position;
4235 #if 0
4236   debug_scb(scb);
4237 #endif;
4238 
4239   /*
4240    * Construct the SCB beforehand, so the sequencer is
4241    * paused a minimal amount of time.
4242    */
4243   aic7xxx_buildscb(p, cmd, scb);
4244 
4245 #if 0
4246   if (scb != &p->scb_array[scb->position])
4247   {
4248     printk("aic7xxx: (queue) Address of SCB by position does not match SCB "
4249            "address.\n");
4250   }
4251   printk("aic7xxx: (queue) SCB pos(%d) cmdptr(0x%x) state(%d) freescb(0x%x)\n",
4252          scb->position, (unsigned int) scb->cmd,
4253          scb->state, (unsigned int) p->free_scb);
4254 #endif
4255   /*
4256    * Pause the sequencer so we can play with its registers -
4257    * wait for it to acknowledge the pause.
4258    *
4259    * XXX - should the interrupts be left on while doing this?
4260    */
4261   PAUSE_SEQUENCER(p);
4262 
4263   /*
4264    * Save the SCB pointer and put our own pointer in - this
4265    * selects one of the four banks of SCB registers. Load
4266    * the SCB, then write its pointer into the queue in FIFO
4267    * and restore the saved SCB pointer.
4268    */
4269   aic7xxx_putscb(p, scb);
4270   outb(scb->position, QINFIFO + p->base);
4271 
4272   /*
4273    * Make sure the Scsi_Cmnd pointer is saved, the struct it
4274    * points to is set up properly, and the parity error flag
4275    * is reset, then unpause the sequencer and watch the fun
4276    * begin.
4277    */
4278   cmd->scsi_done = fn;
4279   aic7xxx_error(cmd) = DID_OK;
4280   aic7xxx_status(cmd) = 0;
4281   cmd->result = 0;
4282   memset(&cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
4283 
4284   UNPAUSE_SEQUENCER(p);
4285 #if 0
4286   printk("aic7xxx: (queue) After - cmd(0x%lx) scb->cmd(0x%lx) pos(%d).\n",
4287          (long) cmd, (long) scb->cmd, scb->position);
4288 #endif;
4289   restore_flags(flags);
4290   return (0);
4291 }
4292 
4293 /*+F*************************************************************************
4294  * Function:
4295  *   aic7xxx_abort_scb
4296  *
4297  * Description:
4298  *   Abort an scb.  If the scb has not previously been aborted, then
4299  *   we attempt to send a BUS_DEVICE_RESET message to the target.  If
4300  *   the scb has previously been unsuccessfully aborted, then we will
4301  *   reset the channel and have all devices renegotiate.  Returns an
4302  *   enumerated type that indicates the status of the operation.
4303  *-F*************************************************************************/
4304 static aha_abort_reset_type
4305 aic7xxx_abort_scb(struct aic7xxx_host *p, struct aic7xxx_scb *scb,
     /*  */
4306                   unsigned char errcode)
4307 {
4308   int base = p->base;
4309   int found = FALSE;
4310   aha_abort_reset_type scb_status = ABORT_RESET_SUCCESS;
4311   char channel = scb->target_channel_lun & SELBUSB ? 'B': 'A';
4312 
4313   /*
4314    * Ensure that the card doesn't do anything
4315    * behind our back.
4316    */
4317   PAUSE_SEQUENCER(p);
4318 
4319 #ifdef AIC7XXX_DEBUG_ABORT
4320   printk ("aic7xxx: (abort_scb) scb %d, scb_aborted 0x%x\n",
4321           scb->position, (scb->state & SCB_ABORTED));
4322 #endif
4323   /*
4324    * First, determine if we want to do a bus reset or simply a bus device
4325    * reset.  If this is the first time that a transaction has timed out,
4326    * just schedule a bus device reset.  Otherwise, we reset the bus and
4327    * abort all pending I/Os on that bus.
4328    */
4329   if (scb->state & SCB_ABORTED)
4330   {
4331     /*
4332      * Been down this road before.  Do a full bus reset.
4333      */
4334     found = aic7xxx_reset_channel(p, channel, scb->position);
4335   }
4336   else
4337   {
4338     unsigned char active_scb, control;
4339     struct aic7xxx_scb *active_scbp;
4340 
4341     /*
4342      * Send a Bus Device Reset Message:
4343      * The target we select to send the message to may be entirely
4344      * different than the target pointed to by the scb that timed
4345      * out.  If the command is in the QINFIFO or the waiting for
4346      * selection list, its not tying up the bus and isn't responsible
4347      * for the delay so we pick off the active command which should
4348      * be the SCB selected by SCBPTR.  If its disconnected or active,
4349      * we device reset the target scbp points to.  Although it may
4350      * be that this target is not responsible for the delay, it may
4351      * may also be that we're timing out on a command that just takes
4352      * too much time, so we try the bus device reset there first.
4353      */
4354     active_scb = inb(SCBPTR + base);
4355     active_scbp = &(p->scb_array[active_scb]);
4356     control = inb(SCBARRAY + base);
4357 
4358     /*
4359      * Test to see if scbp is disconnected
4360      */
4361     outb(scb->position, SCBPTR + base);
4362     if (inb(SCBARRAY + base) & DISCONNECTED)
4363     {
4364 #ifdef AIC7XXX_DEBUG_ABORT
4365   printk ("aic7xxx: (abort_scb) scb %d is disconnected.\n", scb->position);
4366 #endif
4367       scb->state |= (SCB_DEVICE_RESET | SCB_ABORTED);
4368       scb->SG_segment_count = 0;
4369       memset(scb->SG_list_pointer, 0, sizeof(scb->SG_list_pointer));
4370       memset(scb->data_pointer, 0, sizeof(scb->data_pointer));
4371       scb->data_count = 0;
4372       aic7xxx_putscb(p, scb);
4373       aic7xxx_error(scb->cmd) = errcode;
4374       scb_status = ABORT_RESET_PENDING;
4375       aic7xxx_add_waiting_scb(base, scb, LIST_SECOND);
4376       UNPAUSE_SEQUENCER(p);
4377     }
4378     else
4379     {
4380       /*
4381        * Is the active SCB really active?
4382        */
4383       if (active_scbp->state & SCB_ACTIVE)
4384       {
4385         unsigned char msg_len = inb(MSG_LEN + base);
4386         if (msg_len != 0)
4387         {
4388 #ifdef AIC7XXX_DEBUG_ABORT
4389           printk ("aic7xxx: (abort_scb) scb is active, needs DMA, "
4390                   "msg_len is non-zero.\n");
4391 #endif
4392           /*
4393            * If we're in a message phase, tacking on another message
4394            * may confuse the target totally. The bus is probably wedged,
4395            * so reset the channel.
4396            */
4397           channel = (active_scbp->target_channel_lun & SELBUSB) ? 'B': 'A';
4398           aic7xxx_reset_channel(p, channel, scb->position);
4399         }
4400         else
4401         {
4402 #ifdef AIC7XXX_DEBUG_ABORT
4403           printk ("aic7xxx: (abort_scb) scb is active, needs DMA, "
4404                   "msg_len is zero.\n");
4405 #endif
4406           /*
4407            * Load the message buffer and assert attention.
4408            */
4409           active_scbp->state |= (SCB_DEVICE_RESET | SCB_ABORTED);
4410           outb(1, MSG_LEN + base);
4411           outb(MSG_BUS_DEVICE_RESET, MSG0 + base);
4412           if (active_scbp->target_channel_lun != scb->target_channel_lun)
4413           {
4414             /*
4415              * XXX - We would like to increment the timeout on scb, but
4416              *       access to that routine is denied because it is hidden
4417              *       in scsi.c.  If we were able to do this, it would give
4418              *       scb a new lease on life.
4419              */
4420             ;
4421           }
4422           aic7xxx_error(scb->cmd) = errcode;
4423           scb_status = ABORT_RESET_PENDING;
4424           UNPAUSE_SEQUENCER(p);
4425         }
4426       }
4427       else
4428       {
4429 #ifdef AIC7XXX_DEBUG_ABORT
4430           printk ("aic7xxx: (abort_scb) no active command.\n");
4431 #endif
4432         /*
4433          * No active command to single out, so reset
4434          * the bus for the timed out target.
4435          */
4436         aic7xxx_reset_channel(p, channel, scb->position);
4437       }
4438     }
4439   }
4440   return (scb_status);
4441 }
4442 
4443 /*+F*************************************************************************
4444  * Function:
4445  *   aic7xxx_abort_reset
4446  *
4447  * Description:
4448  *   Abort or reset the current SCSI command(s).  Returns an enumerated
4449  *   type that indicates the status of the operation.
4450  *-F*************************************************************************/
4451 static aha_abort_reset_type
4452 aic7xxx_abort_reset(Scsi_Cmnd *cmd, unsigned char errcode)
     /*  */
4453 {
4454   struct aic7xxx_scb  *scb;
4455   struct aic7xxx_host *p;
4456   long flags;
4457   aha_abort_reset_type scb_status = ABORT_RESET_SUCCESS;
4458 
4459   p = (struct aic7xxx_host *) cmd->host->hostdata;
4460   scb = &(p->scb_array[aic7xxx_position(cmd)]);
4461 
4462   save_flags(flags);
4463   cli();
4464 
4465 #ifdef AIC7XXX_DEBUG_ABORT
4466   printk ("aic7xxx: (abort_reset) scb state 0x%x\n", scb->state);
4467 #endif
4468 
4469   if (scb->state & SCB_ACTIVE)
4470   {
4471     if (scb->state & SCB_IMMED)
4472     {
4473       /*
4474        * Don't know how set the number of retries to 0.
4475        */
4476       /* cmd->retries = 0; */
4477       aic7xxx_error(cmd) = errcode;
4478       aic7xxx_done(p, scb);
4479     }
4480     else
4481     {
4482       /*
4483        * Abort the operation.
4484        */
4485       scb_status = aic7xxx_abort_scb(p, scb, errcode);
4486     }
4487   }
4488   else
4489   {
4490     /*
4491      * The scb is not active and must have completed after the timeout
4492      * check in scsi.c and before we check the scb state above.  For
4493      * this case we return SCSI_ABORT_NOT_RUNNING (if abort was called)
4494      * or SCSI_RESET_SUCCESS (if reset was called).
4495      */
4496 #ifdef AIC7XXX_DEBUG_ABORT
4497     printk ("aic7xxx: (abort_reset) called with no active scb, errcode 0x%x\n",
4498             errcode);
4499 #endif
4500     scb_status = ABORT_RESET_INACTIVE;
4501     /*
4502      * According to the comments in scsi.h and Michael Neuffer, if we do not
4503      * have an active command for abort or reset, we should not call the
4504      * command done function.  Unfortunately, this hangs the system for me
4505      * unless we *do* call the done function.
4506      *
4507      * XXX - Revisit this sometime!
4508      */
4509     cmd->result = errcode << 16;
4510     cmd->scsi_done(cmd);
4511   }
4512   restore_flags(flags);
4513   return (scb_status);
4514 }
4515 
4516 
4517 /*+F*************************************************************************
4518  * Function:
4519  *   aic7xxx_abort
4520  *
4521  * Description:
4522  *   Abort the current SCSI command(s).
4523  *-F*************************************************************************/
4524 int
4525 aic7xxx_abort(Scsi_Cmnd *cmd)
     /*  */
4526 {
4527 #ifdef AIC7XXX_DEBUG_ABORT
4528   printk ("aic7xxx: (abort) target/channel %d/%d\n", cmd->target, cmd->channel);
4529 #endif
4530 
4531   switch (aic7xxx_abort_reset(cmd, DID_ABORT))
4532   {
4533     case ABORT_RESET_INACTIVE:
4534       return (SCSI_ABORT_NOT_RUNNING);
4535       break;
4536     case ABORT_RESET_PENDING:
4537       return (SCSI_ABORT_PENDING);
4538       break;
4539     case ABORT_RESET_SUCCESS:
4540     default:
4541       return (SCSI_ABORT_SUCCESS);
4542       break;
4543   }
4544 }
4545 
4546 /*+F*************************************************************************
4547  * Function:
4548  *   aic7xxx_reset
4549  *
4550  * Description:
4551  *   Resetting the bus always succeeds - is has to, otherwise the
4552  *   kernel will panic! Try a surgical technique - sending a BUS
4553  *   DEVICE RESET message - on the offending target before pulling
4554  *   the SCSI bus reset line.
4555  *-F*************************************************************************/
4556 int
4557 aic7xxx_reset(Scsi_Cmnd *cmd)
     /*  */
4558 {
4559 #ifdef AIC7XXX_DEBUG_ABORT
4560   printk ("aic7xxx: (reset) target/channel %d/%d\n", cmd->target, cmd->channel);
4561 #endif
4562 
4563   switch (aic7xxx_abort_reset(cmd, DID_RESET))
4564   {
4565     case ABORT_RESET_PENDING:
4566       return (SCSI_RESET_PENDING);
4567       break;
4568     case ABORT_RESET_INACTIVE:
4569     case ABORT_RESET_SUCCESS:
4570     default:
4571       return (SCSI_RESET_SUCCESS);
4572       break;
4573   }
4574 }
4575 
4576 /*+F*************************************************************************
4577  * Function:
4578  *   aic7xxx_biosparam
4579  *
4580  * Description:
4581  *   Return the disk geometry for the given SCSI device.
4582  *-F*************************************************************************/
4583 int
4584 aic7xxx_biosparam(Disk *disk, kdev_t dev, int geom[])
     /*  */
4585 {
4586   int heads, sectors, cylinders;
4587   struct aic7xxx_host *p;
4588 
4589   p = (struct aic7xxx_host *) disk->device->host->hostdata;
4590 
4591   /*
4592    * XXX - if I could portably find the card's configuration
4593    *       information, then this could be autodetected instead
4594    *       of left to a boot-time switch.
4595    */
4596   heads = 64;
4597   sectors = 32;
4598   cylinders = disk->capacity / (heads * sectors);
4599 
4600   if (p->extended && cylinders > 1024)
4601   {
4602     heads = 255;
4603     sectors = 63;
4604     cylinders = disk->capacity / (255 * 63);
4605   }
4606 
4607   geom[0] = heads;
4608   geom[1] = sectors;
4609   geom[2] = cylinders;
4610 
4611   return (0);
4612 }
4613 
4614 #include "aic7xxx_proc.c"
4615 
4616 #ifdef MODULE
4617 /* Eventually this will go into an include file, but this will be later */
4618 Scsi_Host_Template driver_template = AIC7XXX;
4619 
4620 #include "scsi_module.c"
4621 #endif
4622 
4623 /*
4624  * Overrides for Emacs so that we almost follow Linus's tabbing style.
4625  * Emacs will notice this stuff at the end of the file and automatically
4626  * adjust the settings for this buffer only.  This must remain at the end
4627  * of the file.
4628  * ---------------------------------------------------------------------------
4629  * Local variables:
4630  * c-indent-level: 2
4631  * c-brace-imaginary-offset: 0
4632  * c-brace-offset: -2
4633  * c-argdecl-indent: 2
4634  * c-label-offset: -2
4635  * c-continued-statement-offset: 2
4636  * c-continued-brace-offset: 0
4637  * indent-tabs-mode: nil
4638  * tab-width: 8
4639  * End:
4640  */
4641
/* */
root/drivers/scsi/aic7xxx.c

DEFINITIONS
