drivers/scsi/sym53c8xx_2/sym_hipd.h

   1 /*
   2  * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family
   3  * of PCI-SCSI IO processors.
   4  *
   5  * Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
   6  *
   7  * This driver is derived from the Linux sym53c8xx driver.
   8  * Copyright (C) 1998-2000  Gerard Roudier
   9  *
  10  * The sym53c8xx driver is derived from the ncr53c8xx driver that had been
  11  * a port of the FreeBSD ncr driver to Linux-1.2.13.
  12  *
  13  * The original ncr driver has been written for 386bsd and FreeBSD by
  14  *         Wolfgang Stanglmeier        <wolf@cologne.de>
  15  *         Stefan Esser                <se@mi.Uni-Koeln.de>
  16  * Copyright (C) 1994  Wolfgang Stanglmeier
  17  *
  18  * Other major contributions:
  19  *
  20  * NVRAM detection and reading.
  21  * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
  22  *
  23  *-----------------------------------------------------------------------------
  24  *
  25  * This program is free software; you can redistribute it and/or modify
  26  * it under the terms of the GNU General Public License as published by
  27  * the Free Software Foundation; either version 2 of the License, or
  28  * (at your option) any later version.
  29  *
  30  * This program is distributed in the hope that it will be useful,
  31  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  * GNU General Public License for more details.
  34  *
  35  * You should have received a copy of the GNU General Public License
  36  * along with this program; if not, write to the Free Software
  37  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  38  */
  39
  40 #ifndef SYM_HIPD_H
  41 #define SYM_HIPD_H
  42
  43 /*
  44  *  Generic driver options.
  45  *
  46  *  They may be defined in platform specific headers, if they
  47  *  are useful.
  48  *
  49  *    SYM_OPT_HANDLE_DIR_UNKNOWN
  50  *        When this option is set, the SCRIPTS used by the driver
  51  *        are able to handle SCSI transfers with direction not
  52  *        supplied by user.
  53  *        (set for Linux-2.0.X)
  54  *
  55  *    SYM_OPT_HANDLE_DEVICE_QUEUEING
  56  *        When this option is set, the driver will use a queue per
  57  *        device and handle QUEUE FULL status requeuing internally.
  58  *
  59  *    SYM_OPT_LIMIT_COMMAND_REORDERING
  60  *        When this option is set, the driver tries to limit tagged
  61  *        command reordering to some reasonnable value.
  62  *        (set for Linux)
  63  */
  64 #if 0
  65 #define SYM_OPT_HANDLE_DIR_UNKNOWN
  66 #define SYM_OPT_HANDLE_DEVICE_QUEUEING
  67 #define SYM_OPT_LIMIT_COMMAND_REORDERING
  68 #endif
  69
  70 /*
  71  *  Active debugging tags and verbosity.
  72  *  Both DEBUG_FLAGS and sym_verbose can be redefined
  73  *  by the platform specific code to something else.
  74  */
  75 #define DEBUG_ALLOC     (0x0001)
  76 #define DEBUG_PHASE     (0x0002)
  77 #define DEBUG_POLL      (0x0004)
  78 #define DEBUG_QUEUE     (0x0008)
  79 #define DEBUG_RESULT    (0x0010)
  80 #define DEBUG_SCATTER   (0x0020)
  81 #define DEBUG_SCRIPT    (0x0040)
  82 #define DEBUG_TINY      (0x0080)
  83 #define DEBUG_TIMING    (0x0100)
  84 #define DEBUG_NEGO      (0x0200)
  85 #define DEBUG_TAGS      (0x0400)
  86 #define DEBUG_POINTER   (0x0800)
  87
  88 #ifndef DEBUG_FLAGS
  89 #define DEBUG_FLAGS     (0x0000)
  90 #endif
  91
  92 #ifndef sym_verbose
  93 #define sym_verbose     (np->verbose)
  94 #endif
  95
  96 /*
  97  *  These ones should have been already defined.
  98  */
  99 #ifndef assert
 100 #define assert(expression) { \
 101         if (!(expression)) { \
 102                 (void)panic( \
 103                         "assertion \"%s\" failed: file \"%s\", line %d\n", \
 104                         #expression, \
 105                         __FILE__, __LINE__); \
 106         } \
 107 }
 108 #endif
 109
 110 /*
 111  *  Number of tasks per device we want to handle.
 112  */
 113 #if     SYM_CONF_MAX_TAG_ORDER > 8
 114 #error  "more than 256 tags per logical unit not allowed."
 115 #endif
 116 #define SYM_CONF_MAX_TASK       (1<<SYM_CONF_MAX_TAG_ORDER)
 117
 118 /*
 119  *  Donnot use more tasks that we can handle.
 120  */
 121 #ifndef SYM_CONF_MAX_TAG
 122 #define SYM_CONF_MAX_TAG        SYM_CONF_MAX_TASK
 123 #endif
 124 #if     SYM_CONF_MAX_TAG > SYM_CONF_MAX_TASK
 125 #undef  SYM_CONF_MAX_TAG
 126 #define SYM_CONF_MAX_TAG        SYM_CONF_MAX_TASK
 127 #endif
 128
 129 /*
 130  *    This one means 'NO TAG for this job'
 131  */
 132 #define NO_TAG  (256)
 133
 134 /*
 135  *  Number of SCSI targets.
 136  */
 137 #if     SYM_CONF_MAX_TARGET > 16
 138 #error  "more than 16 targets not allowed."
 139 #endif
 140
 141 /*
 142  *  Number of logical units per target.
 143  */
 144 #if     SYM_CONF_MAX_LUN > 64
 145 #error  "more than 64 logical units per target not allowed."
 146 #endif
 147
 148 /*
 149  *    Asynchronous pre-scaler (ns). Shall be 40 for
 150  *    the SCSI timings to be compliant.
 151  */
 152 #define SYM_CONF_MIN_ASYNC (40)
 153
 154 /*
 155  *  Shortest memory chunk is (1<<SYM_MEM_SHIFT), currently 16.
 156  *  Actual allocations happen as SYM_MEM_CLUSTER_SIZE sized.
 157  *  (1 PAGE at a time is just fine).
 158  */
 159 #define SYM_MEM_SHIFT   4
 160 #define SYM_MEM_CLUSTER_SIZE    (1UL << SYM_MEM_CLUSTER_SHIFT)
 161 #define SYM_MEM_CLUSTER_MASK    (SYM_MEM_CLUSTER_SIZE-1)
 162
 163 /*
 164  *  Number of entries in the START and DONE queues.
 165  *
 166  *  We limit to 1 PAGE in order to succeed allocation of
 167  *  these queues. Each entry is 8 bytes long (2 DWORDS).
 168  */
 169 #ifdef  SYM_CONF_MAX_START
 170 #define SYM_CONF_MAX_QUEUE (SYM_CONF_MAX_START+2)
 171 #else
 172 #define SYM_CONF_MAX_QUEUE (7*SYM_CONF_MAX_TASK+2)
 173 #define SYM_CONF_MAX_START (SYM_CONF_MAX_QUEUE-2)
 174 #endif
 175
 176 #if     SYM_CONF_MAX_QUEUE > SYM_MEM_CLUSTER_SIZE/8
 177 #undef  SYM_CONF_MAX_QUEUE
 178 #define SYM_CONF_MAX_QUEUE (SYM_MEM_CLUSTER_SIZE/8)
 179 #undef  SYM_CONF_MAX_START
 180 #define SYM_CONF_MAX_START (SYM_CONF_MAX_QUEUE-2)
 181 #endif
 182
 183 /*
 184  *  For this one, we want a short name :-)
 185  */
 186 #define MAX_QUEUE       SYM_CONF_MAX_QUEUE
 187
 188 /*
 189  *  Common definitions for both bus space based and legacy IO methods.
 190  */
 191
 192 #define INB_OFF(np, o)          ioread8(np->s.ioaddr + (o))
 193 #define INW_OFF(np, o)          ioread16(np->s.ioaddr + (o))
 194 #define INL_OFF(np, o)          ioread32(np->s.ioaddr + (o))
 195
 196 #define OUTB_OFF(np, o, val)    iowrite8((val), np->s.ioaddr + (o))
 197 #define OUTW_OFF(np, o, val)    iowrite16((val), np->s.ioaddr + (o))
 198 #define OUTL_OFF(np, o, val)    iowrite32((val), np->s.ioaddr + (o))
 199
 200 #define INB(np, r)              INB_OFF(np, offsetof(struct sym_reg, r))
 201 #define INW(np, r)              INW_OFF(np, offsetof(struct sym_reg, r))
 202 #define INL(np, r)              INL_OFF(np, offsetof(struct sym_reg, r))
 203
 204 #define OUTB(np, r, v)          OUTB_OFF(np, offsetof(struct sym_reg, r), (v))
 205 #define OUTW(np, r, v)          OUTW_OFF(np, offsetof(struct sym_reg, r), (v))
 206 #define OUTL(np, r, v)          OUTL_OFF(np, offsetof(struct sym_reg, r), (v))
 207
 208 #define OUTONB(np, r, m)        OUTB(np, r, INB(np, r) | (m))
 209 #define OUTOFFB(np, r, m)       OUTB(np, r, INB(np, r) & ~(m))
 210 #define OUTONW(np, r, m)        OUTW(np, r, INW(np, r) | (m))
 211 #define OUTOFFW(np, r, m)       OUTW(np, r, INW(np, r) & ~(m))
 212 #define OUTONL(np, r, m)        OUTL(np, r, INL(np, r) | (m))
 213 #define OUTOFFL(np, r, m)       OUTL(np, r, INL(np, r) & ~(m))
 214
 215 /*
 216  *  We normally want the chip to have a consistent view
 217  *  of driver internal data structures when we restart it.
 218  *  Thus these macros.
 219  */
 220 #define OUTL_DSP(np, v)                         \
 221         do {                                    \
 222                 MEMORY_WRITE_BARRIER();         \
 223                 OUTL(np, nc_dsp, (v));          \
 224         } while (0)
 225
 226 #define OUTONB_STD()                            \
 227         do {                                    \
 228                 MEMORY_WRITE_BARRIER();         \
 229                 OUTONB(np, nc_dcntl, (STD|NOCOM));      \
 230         } while (0)
 231
 232 /*
 233  *  Command control block states.
 234  */
 235 #define HS_IDLE         (0)
 236 #define HS_BUSY         (1)
 237 #define HS_NEGOTIATE    (2)     /* sync/wide data transfer*/
 238 #define HS_DISCONNECT   (3)     /* Disconnected by target */
 239 #define HS_WAIT         (4)     /* waiting for resource   */
 240
 241 #define HS_DONEMASK     (0x80)
 242 #define HS_COMPLETE     (4|HS_DONEMASK)
 243 #define HS_SEL_TIMEOUT  (5|HS_DONEMASK) /* Selection timeout      */
 244 #define HS_UNEXPECTED   (6|HS_DONEMASK) /* Unexpected disconnect  */
 245 #define HS_COMP_ERR     (7|HS_DONEMASK) /* Completed with error   */
 246
 247 /*
 248  *  Software Interrupt Codes
 249  */
 250 #define SIR_BAD_SCSI_STATUS     (1)
 251 #define SIR_SEL_ATN_NO_MSG_OUT  (2)
 252 #define SIR_MSG_RECEIVED        (3)
 253 #define SIR_MSG_WEIRD           (4)
 254 #define SIR_NEGO_FAILED         (5)
 255 #define SIR_NEGO_PROTO          (6)
 256 #define SIR_SCRIPT_STOPPED      (7)
 257 #define SIR_REJECT_TO_SEND      (8)
 258 #define SIR_SWIDE_OVERRUN       (9)
 259 #define SIR_SODL_UNDERRUN       (10)
 260 #define SIR_RESEL_NO_MSG_IN     (11)
 261 #define SIR_RESEL_NO_IDENTIFY   (12)
 262 #define SIR_RESEL_BAD_LUN       (13)
 263 #define SIR_TARGET_SELECTED     (14)
 264 #define SIR_RESEL_BAD_I_T_L     (15)
 265 #define SIR_RESEL_BAD_I_T_L_Q   (16)
 266 #define SIR_ABORT_SENT          (17)
 267 #define SIR_RESEL_ABORTED       (18)
 268 #define SIR_MSG_OUT_DONE        (19)
 269 #define SIR_COMPLETE_ERROR      (20)
 270 #define SIR_DATA_OVERRUN        (21)
 271 #define SIR_BAD_PHASE           (22)
 272 #if     SYM_CONF_DMA_ADDRESSING_MODE == 2
 273 #define SIR_DMAP_DIRTY          (23)
 274 #define SIR_MAX                 (23)
 275 #else
 276 #define SIR_MAX                 (22)
 277 #endif
 278
 279 /*
 280  *  Extended error bit codes.
 281  *  xerr_status field of struct sym_ccb.
 282  */
 283 #define XE_EXTRA_DATA   (1)     /* unexpected data phase         */
 284 #define XE_BAD_PHASE    (1<<1)  /* illegal phase (4/5)           */
 285 #define XE_PARITY_ERR   (1<<2)  /* unrecovered SCSI parity error */
 286 #define XE_SODL_UNRUN   (1<<3)  /* ODD transfer in DATA OUT phase */
 287 #define XE_SWIDE_OVRUN  (1<<4)  /* ODD transfer in DATA IN phase */
 288
 289 /*
 290  *  Negotiation status.
 291  *  nego_status field of struct sym_ccb.
 292  */
 293 #define NS_SYNC         (1)
 294 #define NS_WIDE         (2)
 295 #define NS_PPR          (3)
 296
 297 /*
 298  *  A CCB hashed table is used to retrieve CCB address
 299  *  from DSA value.
 300  */
 301 #define CCB_HASH_SHIFT          8
 302 #define CCB_HASH_SIZE           (1UL << CCB_HASH_SHIFT)
 303 #define CCB_HASH_MASK           (CCB_HASH_SIZE-1)
 304 #if 1
 305 #define CCB_HASH_CODE(dsa)      \
 306         (((dsa) >> (_LGRU16_(sizeof(struct sym_ccb)))) & CCB_HASH_MASK)
 307 #else
 308 #define CCB_HASH_CODE(dsa)      (((dsa) >> 9) & CCB_HASH_MASK)
 309 #endif
 310
 311 #if     SYM_CONF_DMA_ADDRESSING_MODE == 2
 312 /*
 313  *  We may want to use segment registers for 64 bit DMA.
 314  *  16 segments registers -> up to 64 GB addressable.
 315  */
 316 #define SYM_DMAP_SHIFT  (4)
 317 #define SYM_DMAP_SIZE   (1u<<SYM_DMAP_SHIFT)
 318 #define SYM_DMAP_MASK   (SYM_DMAP_SIZE-1)
 319 #endif
 320
 321 /*
 322  *  Device flags.
 323  */
 324 #define SYM_DISC_ENABLED        (1)
 325 #define SYM_TAGS_ENABLED        (1<<1)
 326 #define SYM_SCAN_BOOT_DISABLED  (1<<2)
 327 #define SYM_SCAN_LUNS_DISABLED  (1<<3)
 328
 329 /*
 330  *  Host adapter miscellaneous flags.
 331  */
 332 #define SYM_AVOID_BUS_RESET     (1)
 333
 334 /*
 335  *  Misc.
 336  */
 337 #define SYM_SNOOP_TIMEOUT (10000000)
 338 #define BUS_8_BIT       0
 339 #define BUS_16_BIT      1
 340
 341 /*
 342  *  Gather negotiable parameters value
 343  */
 344 struct sym_trans {
 345         u8 period;
 346         u8 offset;
 347         unsigned int width:1;
 348         unsigned int iu:1;
 349         unsigned int dt:1;
 350         unsigned int qas:1;
 351         unsigned int check_nego:1;
 352 };
 353
 354 /*
 355  *  Global TCB HEADER.
 356  *
 357  *  Due to lack of indirect addressing on earlier NCR chips,
 358  *  this substructure is copied from the TCB to a global
 359  *  address after selection.
 360  *  For SYMBIOS chips that support LOAD/STORE this copy is
 361  *  not needed and thus not performed.
 362  */
 363 struct sym_tcbh {
 364         /*
 365          *  Scripts bus addresses of LUN table accessed from scripts.
 366          *  LUN #0 is a special case, since multi-lun devices are rare,
 367          *  and we we want to speed-up the general case and not waste
 368          *  resources.
 369          */
 370         u32     luntbl_sa;      /* bus address of this table    */
 371         u32     lun0_sa;        /* bus address of LCB #0        */
 372         /*
 373          *  Actual SYNC/WIDE IO registers value for this target.
 374          *  'sval', 'wval' and 'uval' are read from SCRIPTS and
 375          *  so have alignment constraints.
 376          */
 377 /*0*/   u_char  uval;           /* -> SCNTL4 register           */
 378 /*1*/   u_char  sval;           /* -> SXFER  io register        */
 379 /*2*/   u_char  filler1;
 380 /*3*/   u_char  wval;           /* -> SCNTL3 io register        */
 381 };
 382
 383 /*
 384  *  Target Control Block
 385  */
 386 struct sym_tcb {
 387         /*
 388          *  TCB header.
 389          *  Assumed at offset 0.
 390          */
 391 /*0*/   struct sym_tcbh head;
 392
 393         /*
 394          *  LUN table used by the SCRIPTS processor.
 395          *  An array of bus addresses is used on reselection.
 396          */
 397         u32     *luntbl;        /* LCBs bus address table       */
 398
 399         /*
 400          *  LUN table used by the C code.
 401          */
 402         struct sym_lcb *lun0p;          /* LCB of LUN #0 (usual case)   */
 403 #if SYM_CONF_MAX_LUN > 1
 404         struct sym_lcb **lunmp;         /* Other LCBs [1..MAX_LUN]      */
 405 #endif
 406
 407         /*
 408          *  Bitmap that tells about LUNs that succeeded at least
 409          *  1 IO and therefore assumed to be a real device.
 410          *  Avoid useless allocation of the LCB structure.
 411          */
 412         u32     lun_map[(SYM_CONF_MAX_LUN+31)/32];
 413
 414         /*
 415          *  Bitmap that tells about LUNs that haven't yet an LCB
 416          *  allocated (not discovered or LCB allocation failed).
 417          */
 418         u32     busy0_map[(SYM_CONF_MAX_LUN+31)/32];
 419
 420 #ifdef  SYM_HAVE_STCB
 421         /*
 422          *  O/S specific data structure.
 423          */
 424         struct sym_stcb s;
 425 #endif
 426
 427         /* Transfer goal */
 428         struct sym_trans tgoal;
 429
 430         /*
 431          * Keep track of the CCB used for the negotiation in order
 432          * to ensure that only 1 negotiation is queued at a time.
 433          */
 434         struct sym_ccb *  nego_cp;      /* CCB used for the nego                */
 435
 436         /*
 437          *  Set when we want to reset the device.
 438          */
 439         u_char  to_reset;
 440
 441         /*
 442          *  Other user settable limits and options.
 443          *  These limits are read from the NVRAM if present.
 444          */
 445         u_char  usrflags;
 446         u_short usrtags;
 447         struct scsi_device *sdev;
 448 };
 449
 450 /*
 451  *  Global LCB HEADER.
 452  *
 453  *  Due to lack of indirect addressing on earlier NCR chips,
 454  *  this substructure is copied from the LCB to a global
 455  *  address after selection.
 456  *  For SYMBIOS chips that support LOAD/STORE this copy is
 457  *  not needed and thus not performed.
 458  */
 459 struct sym_lcbh {
 460         /*
 461          *  SCRIPTS address jumped by SCRIPTS on reselection.
 462          *  For not probed logical units, this address points to
 463          *  SCRIPTS that deal with bad LU handling (must be at
 464          *  offset zero of the LCB for that reason).
 465          */
 466 /*0*/   u32     resel_sa;
 467
 468         /*
 469          *  Task (bus address of a CCB) read from SCRIPTS that points
 470          *  to the unique ITL nexus allowed to be disconnected.
 471          */
 472         u32     itl_task_sa;
 473
 474         /*
 475          *  Task table bus address (read from SCRIPTS).
 476          */
 477         u32     itlq_tbl_sa;
 478 };
 479
 480 /*
 481  *  Logical Unit Control Block
 482  */
 483 struct sym_lcb {
 484         /*
 485          *  TCB header.
 486          *  Assumed at offset 0.
 487          */
 488 /*0*/   struct sym_lcbh head;
 489
 490         /*
 491          *  Task table read from SCRIPTS that contains pointers to
 492          *  ITLQ nexuses. The bus address read from SCRIPTS is
 493          *  inside the header.
 494          */
 495         u32     *itlq_tbl;      /* Kernel virtual address       */
 496
 497         /*
 498          *  Busy CCBs management.
 499          */
 500         u_short busy_itlq;      /* Number of busy tagged CCBs   */
 501         u_short busy_itl;       /* Number of busy untagged CCBs */
 502
 503         /*
 504          *  Circular tag allocation buffer.
 505          */
 506         u_short ia_tag;         /* Tag allocation index         */
 507         u_short if_tag;         /* Tag release index            */
 508         u_char  *cb_tags;       /* Circular tags buffer         */
 509
 510         /*
 511          *  O/S specific data structure.
 512          */
 513 #ifdef  SYM_HAVE_SLCB
 514         struct sym_slcb s;
 515 #endif
 516
 517 #ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
 518         /*
 519          *  Optionnaly the driver can handle device queueing,
 520          *  and requeues internally command to redo.
 521          */
 522         SYM_QUEHEAD waiting_ccbq;
 523         SYM_QUEHEAD started_ccbq;
 524         int     num_sgood;
 525         u_short started_tags;
 526         u_short started_no_tag;
 527         u_short started_max;
 528         u_short started_limit;
 529 #endif
 530
 531 #ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
 532         /*
 533          *  Optionally the driver can try to prevent SCSI
 534          *  IOs from being reordered too much.
 535          */
 536         u_char          tags_si;        /* Current index to tags sum    */
 537         u_short         tags_sum[2];    /* Tags sum counters            */
 538         u_short         tags_since;     /* # of tags since last switch  */
 539 #endif
 540
 541         /*
 542          *  Set when we want to clear all tasks.
 543          */
 544         u_char to_clear;
 545
 546         /*
 547          *  Capabilities.
 548          */
 549         u_char  user_flags;
 550         u_char  curr_flags;
 551 };
 552
 553 /*
 554  *  Action from SCRIPTS on a task.
 555  *  Is part of the CCB, but is also used separately to plug
 556  *  error handling action to perform from SCRIPTS.
 557  */
 558 struct sym_actscr {
 559         u32     start;          /* Jumped by SCRIPTS after selection    */
 560         u32     restart;        /* Jumped by SCRIPTS on relection       */
 561 };
 562
 563 /*
 564  *  Phase mismatch context.
 565  *
 566  *  It is part of the CCB and is used as parameters for the
 567  *  DATA pointer. We need two contexts to handle correctly the
 568  *  SAVED DATA POINTER.
 569  */
 570 struct sym_pmc {
 571         struct  sym_tblmove sg; /* Updated interrupted SG block */
 572         u32     ret;            /* SCRIPT return address        */
 573 };
 574
 575 /*
 576  *  LUN control block lookup.
 577  *  We use a direct pointer for LUN #0, and a table of
 578  *  pointers which is only allocated for devices that support
 579  *  LUN(s) > 0.
 580  */
 581 #if SYM_CONF_MAX_LUN <= 1
 582 #define sym_lp(tp, lun) (!lun) ? (tp)->lun0p : NULL
 583 #else
 584 #define sym_lp(tp, lun) \
 585         (!lun) ? (tp)->lun0p : (tp)->lunmp ? (tp)->lunmp[(lun)] : NULL
 586 #endif
 587
 588 /*
 589  *  Status are used by the host and the script processor.
 590  *
 591  *  The last four bytes (status[4]) are copied to the
 592  *  scratchb register (declared as scr0..scr3) just after the
 593  *  select/reselect, and copied back just after disconnecting.
 594  *  Inside the script the XX_REG are used.
 595  */
 596
 597 /*
 598  *  Last four bytes (script)
 599  */
 600 #define  HX_REG scr0
 601 #define  HX_PRT nc_scr0
 602 #define  HS_REG scr1
 603 #define  HS_PRT nc_scr1
 604 #define  SS_REG scr2
 605 #define  SS_PRT nc_scr2
 606 #define  HF_REG scr3
 607 #define  HF_PRT nc_scr3
 608
 609 /*
 610  *  Last four bytes (host)
 611  */
 612 #define  host_xflags   phys.head.status[0]
 613 #define  host_status   phys.head.status[1]
 614 #define  ssss_status   phys.head.status[2]
 615 #define  host_flags    phys.head.status[3]
 616
 617 /*
 618  *  Host flags
 619  */
 620 #define HF_IN_PM0       1u
 621 #define HF_IN_PM1       (1u<<1)
 622 #define HF_ACT_PM       (1u<<2)
 623 #define HF_DP_SAVED     (1u<<3)
 624 #define HF_SENSE        (1u<<4)
 625 #define HF_EXT_ERR      (1u<<5)
 626 #define HF_DATA_IN      (1u<<6)
 627 #ifdef SYM_CONF_IARB_SUPPORT
 628 #define HF_HINT_IARB    (1u<<7)
 629 #endif
 630
 631 /*
 632  *  More host flags
 633  */
 634 #if     SYM_CONF_DMA_ADDRESSING_MODE == 2
 635 #define HX_DMAP_DIRTY   (1u<<7)
 636 #endif
 637
 638 /*
 639  *  Global CCB HEADER.
 640  *
 641  *  Due to lack of indirect addressing on earlier NCR chips,
 642  *  this substructure is copied from the ccb to a global
 643  *  address after selection (or reselection) and copied back
 644  *  before disconnect.
 645  *  For SYMBIOS chips that support LOAD/STORE this copy is
 646  *  not needed and thus not performed.
 647  */
 648
 649 struct sym_ccbh {
 650         /*
 651          *  Start and restart SCRIPTS addresses (must be at 0).
 652          */
 653 /*0*/   struct sym_actscr go;
 654
 655         /*
 656          *  SCRIPTS jump address that deal with data pointers.
 657          *  'savep' points to the position in the script responsible
 658          *  for the actual transfer of data.
 659          *  It's written on reception of a SAVE_DATA_POINTER message.
 660          */
 661         u32     savep;          /* Jump address to saved data pointer   */
 662         u32     lastp;          /* SCRIPTS address at end of data       */
 663 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
 664         u32     wlastp;
 665 #endif
 666
 667         /*
 668          *  Status fields.
 669          */
 670         u8      status[4];
 671 };
 672
 673 /*
 674  *  GET/SET the value of the data pointer used by SCRIPTS.
 675  *
 676  *  We must distinguish between the LOAD/STORE-based SCRIPTS
 677  *  that use directly the header in the CCB, and the NCR-GENERIC
 678  *  SCRIPTS that use the copy of the header in the HCB.
 679  */
 680 #if     SYM_CONF_GENERIC_SUPPORT
 681 #define sym_set_script_dp(np, cp, dp)                           \
 682         do {                                                    \
 683                 if (np->features & FE_LDSTR)                    \
 684                         cp->phys.head.lastp = cpu_to_scr(dp);   \
 685                 else                                            \
 686                         np->ccb_head.lastp = cpu_to_scr(dp);    \
 687         } while (0)
 688 #define sym_get_script_dp(np, cp)                               \
 689         scr_to_cpu((np->features & FE_LDSTR) ?                  \
 690                 cp->phys.head.lastp : np->ccb_head.lastp)
 691 #else
 692 #define sym_set_script_dp(np, cp, dp)                           \
 693         do {                                                    \
 694                 cp->phys.head.lastp = cpu_to_scr(dp);           \
 695         } while (0)
 696
 697 #define sym_get_script_dp(np, cp) (cp->phys.head.lastp)
 698 #endif
 699
 700 /*
 701  *  Data Structure Block
 702  *
 703  *  During execution of a ccb by the script processor, the
 704  *  DSA (data structure address) register points to this
 705  *  substructure of the ccb.
 706  */
 707 struct sym_dsb {
 708         /*
 709          *  CCB header.
 710          *  Also assumed at offset 0 of the sym_ccb structure.
 711          */
 712 /*0*/   struct sym_ccbh head;
 713
 714         /*
 715          *  Phase mismatch contexts.
 716          *  We need two to handle correctly the SAVED DATA POINTER.
 717          *  MUST BOTH BE AT OFFSET < 256, due to using 8 bit arithmetic
 718          *  for address calculation from SCRIPTS.
 719          */
 720         struct sym_pmc pm0;
 721         struct sym_pmc pm1;
 722
 723         /*
 724          *  Table data for Script
 725          */
 726         struct sym_tblsel  select;
 727         struct sym_tblmove smsg;
 728         struct sym_tblmove smsg_ext;
 729         struct sym_tblmove cmd;
 730         struct sym_tblmove sense;
 731         struct sym_tblmove wresid;
 732         struct sym_tblmove data [SYM_CONF_MAX_SG];
 733 };
 734
 735 /*
 736  *  Our Command Control Block
 737  */
 738 struct sym_ccb {
 739         /*
 740          *  This is the data structure which is pointed by the DSA
 741          *  register when it is executed by the script processor.
 742          *  It must be the first entry.
 743          */
 744         struct sym_dsb phys;
 745
 746         /*
 747          *  Pointer to CAM ccb and related stuff.
 748          */
 749         struct scsi_cmnd *cmd;  /* CAM scsiio ccb               */
 750         u8      cdb_buf[16];    /* Copy of CDB                  */
 751 #define SYM_SNS_BBUF_LEN 32
 752         u8      sns_bbuf[SYM_SNS_BBUF_LEN]; /* Bounce buffer for sense data */
 753         int     data_len;       /* Total data length            */
 754         int     segments;       /* Number of SG segments        */
 755
 756         u8      order;          /* Tag type (if tagged command) */
 757
 758         /*
 759          *  Miscellaneous status'.
 760          */
 761         u_char  nego_status;    /* Negotiation status           */
 762         u_char  xerr_status;    /* Extended error flags         */
 763         u32     extra_bytes;    /* Extraneous bytes transferred */
 764
 765         /*
 766          *  Message areas.
 767          *  We prepare a message to be sent after selection.
 768          *  We may use a second one if the command is rescheduled
 769          *  due to CHECK_CONDITION or COMMAND TERMINATED.
 770          *  Contents are IDENTIFY and SIMPLE_TAG.
 771          *  While negotiating sync or wide transfer,
 772          *  a SDTR or WDTR message is appended.
 773          */
 774         u_char  scsi_smsg [12];
 775         u_char  scsi_smsg2[12];
 776
 777         /*
 778          *  Auto request sense related fields.
 779          */
 780         u_char  sensecmd[6];    /* Request Sense command        */
 781         u_char  sv_scsi_status; /* Saved SCSI status            */
 782         u_char  sv_xerr_status; /* Saved extended status        */
 783         int     sv_resid;       /* Saved residual               */
 784
 785         /*
 786          *  Other fields.
 787          */
 788         u32     ccb_ba;         /* BUS address of this CCB      */
 789         u_short tag;            /* Tag for this transfer        */
 790                                 /*  NO_TAG means no tag         */
 791         u_char  target;
 792         u_char  lun;
 793         struct sym_ccb *link_ccbh;      /* Host adapter CCB hash chain  */
 794         SYM_QUEHEAD link_ccbq;  /* Link to free/busy CCB queue  */
 795         u32     startp;         /* Initial data pointer         */
 796         u32     goalp;          /* Expected last data pointer   */
 797 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
 798         u32     wgoalp;
 799 #endif
 800         int     ext_sg;         /* Extreme data pointer, used   */
 801         int     ext_ofs;        /*  to calculate the residual.  */
 802 #ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
 803         SYM_QUEHEAD link2_ccbq; /* Link for device queueing     */
 804         u_char  started;        /* CCB queued to the squeue     */
 805 #endif
 806         u_char  to_abort;       /* Want this IO to be aborted   */
 807 #ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
 808         u_char  tags_si;        /* Lun tags sum index (0,1)     */
 809 #endif
 810 };
 811
 812 #define CCB_BA(cp,lbl)  (cp->ccb_ba + offsetof(struct sym_ccb, lbl))
 813
 814 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
 815 #define sym_goalp(cp) ((cp->host_flags & HF_DATA_IN) ? cp->goalp : cp->wgoalp)
 816 #else
 817 #define sym_goalp(cp) (cp->goalp)
 818 #endif
 819
 820 typedef struct device *m_pool_ident_t;
 821
 822 /*
 823  *  Host Control Block
 824  */
 825 struct sym_hcb {
 826         /*
 827          *  Global headers.
 828          *  Due to poorness of addressing capabilities, earlier
 829          *  chips (810, 815, 825) copy part of the data structures
 830          *  (CCB, TCB and LCB) in fixed areas.
 831          */
 832 #if     SYM_CONF_GENERIC_SUPPORT
 833         struct sym_ccbh ccb_head;
 834         struct sym_tcbh tcb_head;
 835         struct sym_lcbh lcb_head;
 836 #endif
 837         /*
 838          *  Idle task and invalid task actions and
 839          *  their bus addresses.
 840          */
 841         struct sym_actscr idletask, notask, bad_itl, bad_itlq;
 842         u32 idletask_ba, notask_ba, bad_itl_ba, bad_itlq_ba;
 843
 844         /*
 845          *  Dummy lun table to protect us against target
 846          *  returning bad lun number on reselection.
 847          */
 848         u32     *badluntbl;     /* Table physical address       */
 849         u32     badlun_sa;      /* SCRIPT handler BUS address   */
 850
 851         /*
 852          *  Bus address of this host control block.
 853          */
 854         u32     hcb_ba;
 855
 856         /*
 857          *  Bit 32-63 of the on-chip RAM bus address in LE format.
 858          *  The START_RAM64 script loads the MMRS and MMWS from this
 859          *  field.
 860          */
 861         u32     scr_ram_seg;
 862
 863         /*
 864          *  Initial value of some IO register bits.
 865          *  These values are assumed to have been set by BIOS, and may
 866          *  be used to probe adapter implementation differences.
 867          */
 868         u_char  sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest3, sv_ctest4,
 869                 sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4, sv_scntl4,
 870                 sv_stest1;
 871
 872         /*
 873          *  Actual initial value of IO register bits used by the
 874          *  driver. They are loaded at initialisation according to
 875          *  features that are to be enabled/disabled.
 876          */
 877         u_char  rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest3, rv_ctest4,
 878                 rv_ctest5, rv_stest2, rv_ccntl0, rv_ccntl1, rv_scntl4;
 879
 880         /*
 881          *  Target data.
 882          */
 883         struct sym_tcb  target[SYM_CONF_MAX_TARGET];
 884
 885         /*
 886          *  Target control block bus address array used by the SCRIPT
 887          *  on reselection.
 888          */
 889         u32             *targtbl;
 890         u32             targtbl_ba;
 891
 892         /*
 893          *  DMA pool handle for this HBA.
 894          */
 895         m_pool_ident_t  bus_dmat;
 896
 897         /*
 898          *  O/S specific data structure
 899          */
 900         struct sym_shcb s;
 901
 902         /*
 903          *  Physical bus addresses of the chip.
 904          */
 905         u32             mmio_ba;        /* MMIO 32 bit BUS address      */
 906         int             mmio_ws;        /* MMIO Window size             */
 907
 908         u32             ram_ba;         /* RAM 32 bit BUS address       */
 909         int             ram_ws;         /* RAM window size              */
 910
 911         /*
 912          *  SCRIPTS virtual and physical bus addresses.
 913          *  'script'  is loaded in the on-chip RAM if present.
 914          *  'scripth' stays in main memory for all chips except the
 915          *  53C895A, 53C896 and 53C1010 that provide 8K on-chip RAM.
 916          */
 917         u_char          *scripta0;      /* Copy of scripts A, B, Z      */
 918         u_char          *scriptb0;
 919         u_char          *scriptz0;
 920         u32             scripta_ba;     /* Actual scripts A, B, Z       */
 921         u32             scriptb_ba;     /* 32 bit bus addresses.        */
 922         u32             scriptz_ba;
 923         u_short         scripta_sz;     /* Actual size of script A, B, Z*/
 924         u_short         scriptb_sz;
 925         u_short         scriptz_sz;
 926
 927         /*
 928          *  Bus addresses, setup and patch methods for
 929          *  the selected firmware.
 930          */
 931         struct sym_fwa_ba fwa_bas;      /* Useful SCRIPTA bus addresses */
 932         struct sym_fwb_ba fwb_bas;      /* Useful SCRIPTB bus addresses */
 933         struct sym_fwz_ba fwz_bas;      /* Useful SCRIPTZ bus addresses */
 934         void            (*fw_setup)(struct sym_hcb *np, struct sym_fw *fw);
 935         void            (*fw_patch)(struct sym_hcb *np);
 936         char            *fw_name;
 937
 938         /*
 939          *  General controller parameters and configuration.
 940          */
 941         u_short device_id;      /* PCI device id                */
 942         u_char  revision_id;    /* PCI device revision id       */
 943         u_int   features;       /* Chip features map            */
 944         u_char  myaddr;         /* SCSI id of the adapter       */
 945         u_char  maxburst;       /* log base 2 of dwords burst   */
 946         u_char  maxwide;        /* Maximum transfer width       */
 947         u_char  minsync;        /* Min sync period factor (ST)  */
 948         u_char  maxsync;        /* Max sync period factor (ST)  */
 949         u_char  maxoffs;        /* Max scsi offset        (ST)  */
 950         u_char  minsync_dt;     /* Min sync period factor (DT)  */
 951         u_char  maxsync_dt;     /* Max sync period factor (DT)  */
 952         u_char  maxoffs_dt;     /* Max scsi offset        (DT)  */
 953         u_char  multiplier;     /* Clock multiplier (1,2,4)     */
 954         u_char  clock_divn;     /* Number of clock divisors     */
 955         u32     clock_khz;      /* SCSI clock frequency in KHz  */
 956         u32     pciclk_khz;     /* Estimated PCI clock  in KHz  */
 957         /*
 958          *  Start queue management.
 959          *  It is filled up by the host processor and accessed by the
 960          *  SCRIPTS processor in order to start SCSI commands.
 961          */
 962         volatile                /* Prevent code optimizations   */
 963         u32     *squeue;        /* Start queue virtual address  */
 964         u32     squeue_ba;      /* Start queue BUS address      */
 965         u_short squeueput;      /* Next free slot of the queue  */
 966         u_short actccbs;        /* Number of allocated CCBs     */
 967
 968         /*
 969          *  Command completion queue.
 970          *  It is the same size as the start queue to avoid overflow.
 971          */
 972         u_short dqueueget;      /* Next position to scan        */
 973         volatile                /* Prevent code optimizations   */
 974         u32     *dqueue;        /* Completion (done) queue      */
 975         u32     dqueue_ba;      /* Done queue BUS address       */
 976
 977         /*
 978          *  Miscellaneous buffers accessed by the scripts-processor.
 979          *  They shall be DWORD aligned, because they may be read or
 980          *  written with a script command.
 981          */
 982         u_char          msgout[8];      /* Buffer for MESSAGE OUT       */
 983         u_char          msgin [8];      /* Buffer for MESSAGE IN        */
 984         u32             lastmsg;        /* Last SCSI message sent       */
 985         u32             scratch;        /* Scratch for SCSI receive     */
 986                                         /* Also used for cache test     */
 987         /*
 988          *  Miscellaneous configuration and status parameters.
 989          */
 990         u_char          usrflags;       /* Miscellaneous user flags     */
 991         u_char          scsi_mode;      /* Current SCSI BUS mode        */
 992         u_char          verbose;        /* Verbosity for this controller*/
 993
 994         /*
 995          *  CCB lists and queue.
 996          */
 997         struct sym_ccb **ccbh;                  /* CCBs hashed by DSA value     */
 998                                         /* CCB_HASH_SIZE lists of CCBs  */
 999         SYM_QUEHEAD     free_ccbq;      /* Queue of available CCBs      */
1000         SYM_QUEHEAD     busy_ccbq;      /* Queue of busy CCBs           */
1001
1002         /*
1003          *  During error handling and/or recovery,
1004          *  active CCBs that are to be completed with
1005          *  error or requeued are moved from the busy_ccbq
1006          *  to the comp_ccbq prior to completion.
1007          */
1008         SYM_QUEHEAD     comp_ccbq;
1009
1010 #ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
1011         SYM_QUEHEAD     dummy_ccbq;
1012 #endif
1013
1014         /*
1015          *  IMMEDIATE ARBITRATION (IARB) control.
1016          *
1017          *  We keep track in 'last_cp' of the last CCB that has been
1018          *  queued to the SCRIPTS processor and clear 'last_cp' when
1019          *  this CCB completes. If last_cp is not zero at the moment
1020          *  we queue a new CCB, we set a flag in 'last_cp' that is
1021          *  used by the SCRIPTS as a hint for setting IARB.
1022          *  We donnot set more than 'iarb_max' consecutive hints for
1023          *  IARB in order to leave devices a chance to reselect.
1024          *  By the way, any non zero value of 'iarb_max' is unfair. :)
1025          */
1026 #ifdef SYM_CONF_IARB_SUPPORT
1027         u_short         iarb_max;       /* Max. # consecutive IARB hints*/
1028         u_short         iarb_count;     /* Actual # of these hints      */
1029         struct sym_ccb *        last_cp;
1030 #endif
1031
1032         /*
1033          *  Command abort handling.
1034          *  We need to synchronize tightly with the SCRIPTS
1035          *  processor in order to handle things correctly.
1036          */
1037         u_char          abrt_msg[4];    /* Message to send buffer       */
1038         struct sym_tblmove abrt_tbl;    /* Table for the MOV of it      */
1039         struct sym_tblsel  abrt_sel;    /* Sync params for selection    */
1040         u_char          istat_sem;      /* Tells the chip to stop (SEM) */
1041
1042         /*
1043          *  64 bit DMA handling.
1044          */
1045 #if     SYM_CONF_DMA_ADDRESSING_MODE != 0
1046         u_char  use_dac;                /* Use PCI DAC cycles           */
1047 #if     SYM_CONF_DMA_ADDRESSING_MODE == 2
1048         u_char  dmap_dirty;             /* Dma segments registers dirty */
1049         u32     dmap_bah[SYM_DMAP_SIZE];/* Segment registers map        */
1050 #endif
1051 #endif
1052 };
1053
1054 #define HCB_BA(np, lbl) (np->hcb_ba + offsetof(struct sym_hcb, lbl))
1055
1056
1057 /*
1058  *  FIRMWARES (sym_fw.c)
1059  */
1060 struct sym_fw * sym_find_firmware(struct sym_chip *chip);
1061 void sym_fw_bind_script(struct sym_hcb *np, u32 *start, int len);
1062
1063 /*
1064  *  Driver methods called from O/S specific code.
1065  */
1066 char *sym_driver_name(void);
1067 void sym_print_xerr(struct scsi_cmnd *cmd, int x_status);
1068 int sym_reset_scsi_bus(struct sym_hcb *np, int enab_int);
1069 struct sym_chip *sym_lookup_chip_table(u_short device_id, u_char revision);
1070 void sym_put_start_queue(struct sym_hcb *np, struct sym_ccb *cp);
1071 #ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
1072 void sym_start_next_ccbs(struct sym_hcb *np, struct sym_lcb *lp, int maxn);
1073 #endif
1074 void sym_start_up(struct sym_hcb *np, int reason);
1075 void sym_interrupt(struct sym_hcb *np);
1076 int sym_clear_tasks(struct sym_hcb *np, int cam_status, int target, int lun, int task);
1077 struct sym_ccb *sym_get_ccb(struct sym_hcb *np, struct scsi_cmnd *cmd, u_char tag_order);
1078 void sym_free_ccb(struct sym_hcb *np, struct sym_ccb *cp);
1079 struct sym_lcb *sym_alloc_lcb(struct sym_hcb *np, u_char tn, u_char ln);
1080 int sym_queue_scsiio(struct sym_hcb *np, struct scsi_cmnd *csio, struct sym_ccb *cp);
1081 int sym_abort_scsiio(struct sym_hcb *np, struct scsi_cmnd *ccb, int timed_out);
1082 int sym_reset_scsi_target(struct sym_hcb *np, int target);
1083 void sym_hcb_free(struct sym_hcb *np);
1084 int sym_hcb_attach(struct Scsi_Host *shost, struct sym_fw *fw, struct sym_nvram *nvram);
1085
1086 /*
1087  *  Build a scatter/gather entry.
1088  *
1089  *  For 64 bit systems, we use the 8 upper bits of the size field
1090  *  to provide bus address bits 32-39 to the SCRIPTS processor.
1091  *  This allows the 895A, 896, 1010 to address up to 1 TB of memory.
1092  */
1093
1094 #if   SYM_CONF_DMA_ADDRESSING_MODE == 0
1095 #define sym_build_sge(np, data, badd, len)      \
1096 do {                                            \
1097         (data)->addr = cpu_to_scr(badd);        \
1098         (data)->size = cpu_to_scr(len);         \
1099 } while (0)
1100 #elif SYM_CONF_DMA_ADDRESSING_MODE == 1
1101 #define sym_build_sge(np, data, badd, len)                              \
1102 do {                                                                    \
1103         (data)->addr = cpu_to_scr(badd);                                \
1104         (data)->size = cpu_to_scr((((badd) >> 8) & 0xff000000) + len);  \
1105 } while (0)
1106 #elif SYM_CONF_DMA_ADDRESSING_MODE == 2
1107 int sym_lookup_dmap(struct sym_hcb *np, u32 h, int s);
1108 static __inline void
1109 sym_build_sge(struct sym_hcb *np, struct sym_tblmove *data, u64 badd, int len)
1110 {
1111         u32 h = (badd>>32);
1112         int s = (h&SYM_DMAP_MASK);
1113
1114         if (h != np->dmap_bah[s])
1115                 goto bad;
1116 good:
1117         (data)->addr = cpu_to_scr(badd);
1118         (data)->size = cpu_to_scr((s<<24) + len);
1119         return;
1120 bad:
1121         s = sym_lookup_dmap(np, h, s);
1122         goto good;
1123 }
1124 #else
1125 #error "Unsupported DMA addressing mode"
1126 #endif
1127
1128 /*
1129  *  Set up data pointers used by SCRIPTS.
1130  *  Called from O/S specific code.
1131  */
1132 static inline void sym_setup_data_pointers(struct sym_hcb *np,
1133                 struct sym_ccb *cp, int dir)
1134 {
1135         u32 lastp, goalp;
1136
1137         /*
1138          *  No segments means no data.
1139          */
1140         if (!cp->segments)
1141                 dir = CAM_DIR_NONE;
1142
1143         /*
1144          *  Set the data pointer.
1145          */
1146         switch(dir) {
1147 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
1148         case CAM_DIR_UNKNOWN:
1149 #endif
1150         case CAM_DIR_OUT:
1151                 goalp = SCRIPTA_BA(np, data_out2) + 8;
1152                 lastp = goalp - 8 - (cp->segments * (2*4));
1153 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
1154                 cp->wgoalp = cpu_to_scr(goalp);
1155                 if (dir != CAM_DIR_UNKNOWN)
1156                         break;
1157                 cp->phys.head.wlastp = cpu_to_scr(lastp);
1158                 /* fall through */
1159 #else
1160                 break;
1161 #endif
1162         case CAM_DIR_IN:
1163                 cp->host_flags |= HF_DATA_IN;
1164                 goalp = SCRIPTA_BA(np, data_in2) + 8;
1165                 lastp = goalp - 8 - (cp->segments * (2*4));
1166                 break;
1167         case CAM_DIR_NONE:
1168         default:
1169 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
1170                 cp->host_flags |= HF_DATA_IN;
1171 #endif
1172                 lastp = goalp = SCRIPTB_BA(np, no_data);
1173                 break;
1174         }
1175
1176         /*
1177          *  Set all pointers values needed by SCRIPTS.
1178          */
1179         cp->phys.head.lastp = cpu_to_scr(lastp);
1180         cp->phys.head.savep = cpu_to_scr(lastp);
1181         cp->startp          = cp->phys.head.savep;
1182         cp->goalp           = cpu_to_scr(goalp);
1183
1184 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
1185         /*
1186          *  If direction is unknown, start at data_io.
1187          */
1188         if (dir == CAM_DIR_UNKNOWN)
1189                 cp->phys.head.savep = cpu_to_scr(SCRIPTB_BA(np, data_io));
1190 #endif
1191 }
1192
1193 /*
1194  *  MEMORY ALLOCATOR.
1195  */
1196
1197 #define SYM_MEM_PAGE_ORDER 0    /* 1 PAGE  maximum */
1198 #define SYM_MEM_CLUSTER_SHIFT   (PAGE_SHIFT+SYM_MEM_PAGE_ORDER)
1199 #define SYM_MEM_FREE_UNUSED     /* Free unused pages immediately */
1200
1201 #define SYM_MEM_WARN    1       /* Warn on failed operations */
1202
1203 #define sym_get_mem_cluster()   \
1204         (void *) __get_free_pages(GFP_ATOMIC, SYM_MEM_PAGE_ORDER)
1205 #define sym_free_mem_cluster(p) \
1206         free_pages((unsigned long)p, SYM_MEM_PAGE_ORDER)
1207
1208 /*
1209  *  Link between free memory chunks of a given size.
1210  */
1211 typedef struct sym_m_link {
1212         struct sym_m_link *next;
1213 } *m_link_p;
1214
1215 /*
1216  *  Virtual to bus physical translation for a given cluster.
1217  *  Such a structure is only useful with DMA abstraction.
1218  */
1219 typedef struct sym_m_vtob {     /* Virtual to Bus address translation */
1220         struct sym_m_vtob *next;
1221         void *vaddr;            /* Virtual address */
1222         dma_addr_t baddr;       /* Bus physical address */
1223 } *m_vtob_p;
1224
1225 /* Hash this stuff a bit to speed up translations */
1226 #define VTOB_HASH_SHIFT         5
1227 #define VTOB_HASH_SIZE          (1UL << VTOB_HASH_SHIFT)
1228 #define VTOB_HASH_MASK          (VTOB_HASH_SIZE-1)
1229 #define VTOB_HASH_CODE(m)       \
1230         ((((unsigned long)(m)) >> SYM_MEM_CLUSTER_SHIFT) & VTOB_HASH_MASK)
1231
1232 /*
1233  *  Memory pool of a given kind.
1234  *  Ideally, we want to use:
1235  *  1) 1 pool for memory we donnot need to involve in DMA.
1236  *  2) The same pool for controllers that require same DMA
1237  *     constraints and features.
1238  *     The OS specific m_pool_id_t thing and the sym_m_pool_match()
1239  *     method are expected to tell the driver about.
1240  */
1241 typedef struct sym_m_pool {
1242         m_pool_ident_t  dev_dmat;       /* Identifies the pool (see above) */
1243         void * (*get_mem_cluster)(struct sym_m_pool *);
1244 #ifdef  SYM_MEM_FREE_UNUSED
1245         void (*free_mem_cluster)(struct sym_m_pool *, void *);
1246 #endif
1247 #define M_GET_MEM_CLUSTER()             mp->get_mem_cluster(mp)
1248 #define M_FREE_MEM_CLUSTER(p)           mp->free_mem_cluster(mp, p)
1249         int nump;
1250         m_vtob_p vtob[VTOB_HASH_SIZE];
1251         struct sym_m_pool *next;
1252         struct sym_m_link h[SYM_MEM_CLUSTER_SHIFT - SYM_MEM_SHIFT + 1];
1253 } *m_pool_p;
1254
1255 /*
1256  *  Alloc, free and translate addresses to bus physical
1257  *  for DMAable memory.
1258  */
1259 void *__sym_calloc_dma(m_pool_ident_t dev_dmat, int size, char *name);
1260 void __sym_mfree_dma(m_pool_ident_t dev_dmat, void *m, int size, char *name);
1261 dma_addr_t __vtobus(m_pool_ident_t dev_dmat, void *m);
1262
1263 /*
1264  * Verbs used by the driver code for DMAable memory handling.
1265  * The _uvptv_ macro avoids a nasty warning about pointer to volatile
1266  * being discarded.
1267  */
1268 #define _uvptv_(p) ((void *)((u_long)(p)))
1269
1270 #define _sym_calloc_dma(np, l, n)       __sym_calloc_dma(np->bus_dmat, l, n)
1271 #define _sym_mfree_dma(np, p, l, n)     \
1272                         __sym_mfree_dma(np->bus_dmat, _uvptv_(p), l, n)
1273 #define sym_calloc_dma(l, n)            _sym_calloc_dma(np, l, n)
1274 #define sym_mfree_dma(p, l, n)          _sym_mfree_dma(np, p, l, n)
1275 #define vtobus(p)                       __vtobus(np->bus_dmat, _uvptv_(p))
1276
1277 /*
1278  *  We have to provide the driver memory allocator with methods for
1279  *  it to maintain virtual to bus physical address translations.
1280  */
1281
1282 #define sym_m_pool_match(mp_id1, mp_id2)        (mp_id1 == mp_id2)
1283
1284 static __inline void *sym_m_get_dma_mem_cluster(m_pool_p mp, m_vtob_p vbp)
1285 {
1286         void *vaddr = NULL;
1287         dma_addr_t baddr = 0;
1288
1289         vaddr = dma_alloc_coherent(mp->dev_dmat, SYM_MEM_CLUSTER_SIZE, &baddr,
1290                         GFP_ATOMIC);
1291         if (vaddr) {
1292                 vbp->vaddr = vaddr;
1293                 vbp->baddr = baddr;
1294         }
1295         return vaddr;
1296 }
1297
1298 static __inline void sym_m_free_dma_mem_cluster(m_pool_p mp, m_vtob_p vbp)
1299 {
1300         dma_free_coherent(mp->dev_dmat, SYM_MEM_CLUSTER_SIZE, vbp->vaddr,
1301                         vbp->baddr);
1302 }
1303
1304 #endif /* SYM_HIPD_H */