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 /*
 156  * MEMORY ALLOCATOR.
 157  */
 158
 159 #define SYM_MEM_WARN    1       /* Warn on failed operations */
 160
 161 #define SYM_MEM_PAGE_ORDER 0    /* 1 PAGE  maximum */
 162 #define SYM_MEM_CLUSTER_SHIFT   (PAGE_SHIFT+SYM_MEM_PAGE_ORDER)
 163 #define SYM_MEM_FREE_UNUSED     /* Free unused pages immediately */
 164 /*
 165  *  Shortest memory chunk is (1<<SYM_MEM_SHIFT), currently 16.
 166  *  Actual allocations happen as SYM_MEM_CLUSTER_SIZE sized.
 167  *  (1 PAGE at a time is just fine).
 168  */
 169 #define SYM_MEM_SHIFT   4
 170 #define SYM_MEM_CLUSTER_SIZE    (1UL << SYM_MEM_CLUSTER_SHIFT)
 171 #define SYM_MEM_CLUSTER_MASK    (SYM_MEM_CLUSTER_SIZE-1)
 172
 173 /*
 174  *  Number of entries in the START and DONE queues.
 175  *
 176  *  We limit to 1 PAGE in order to succeed allocation of
 177  *  these queues. Each entry is 8 bytes long (2 DWORDS).
 178  */
 179 #ifdef  SYM_CONF_MAX_START
 180 #define SYM_CONF_MAX_QUEUE (SYM_CONF_MAX_START+2)
 181 #else
 182 #define SYM_CONF_MAX_QUEUE (7*SYM_CONF_MAX_TASK+2)
 183 #define SYM_CONF_MAX_START (SYM_CONF_MAX_QUEUE-2)
 184 #endif
 185
 186 #if     SYM_CONF_MAX_QUEUE > SYM_MEM_CLUSTER_SIZE/8
 187 #undef  SYM_CONF_MAX_QUEUE
 188 #define SYM_CONF_MAX_QUEUE (SYM_MEM_CLUSTER_SIZE/8)
 189 #undef  SYM_CONF_MAX_START
 190 #define SYM_CONF_MAX_START (SYM_CONF_MAX_QUEUE-2)
 191 #endif
 192
 193 /*
 194  *  For this one, we want a short name :-)
 195  */
 196 #define MAX_QUEUE       SYM_CONF_MAX_QUEUE
 197
 198 /*
 199  *  Common definitions for both bus space based and legacy IO methods.
 200  */
 201
 202 #define INB_OFF(np, o)          ioread8(np->s.ioaddr + (o))
 203 #define INW_OFF(np, o)          ioread16(np->s.ioaddr + (o))
 204 #define INL_OFF(np, o)          ioread32(np->s.ioaddr + (o))
 205
 206 #define OUTB_OFF(np, o, val)    iowrite8((val), np->s.ioaddr + (o))
 207 #define OUTW_OFF(np, o, val)    iowrite16((val), np->s.ioaddr + (o))
 208 #define OUTL_OFF(np, o, val)    iowrite32((val), np->s.ioaddr + (o))
 209
 210 #define INB(np, r)              INB_OFF(np, offsetof(struct sym_reg, r))
 211 #define INW(np, r)              INW_OFF(np, offsetof(struct sym_reg, r))
 212 #define INL(np, r)              INL_OFF(np, offsetof(struct sym_reg, r))
 213
 214 #define OUTB(np, r, v)          OUTB_OFF(np, offsetof(struct sym_reg, r), (v))
 215 #define OUTW(np, r, v)          OUTW_OFF(np, offsetof(struct sym_reg, r), (v))
 216 #define OUTL(np, r, v)          OUTL_OFF(np, offsetof(struct sym_reg, r), (v))
 217
 218 #define OUTONB(np, r, m)        OUTB(np, r, INB(np, r) | (m))
 219 #define OUTOFFB(np, r, m)       OUTB(np, r, INB(np, r) & ~(m))
 220 #define OUTONW(np, r, m)        OUTW(np, r, INW(np, r) | (m))
 221 #define OUTOFFW(np, r, m)       OUTW(np, r, INW(np, r) & ~(m))
 222 #define OUTONL(np, r, m)        OUTL(np, r, INL(np, r) | (m))
 223 #define OUTOFFL(np, r, m)       OUTL(np, r, INL(np, r) & ~(m))
 224
 225 /*
 226  *  We normally want the chip to have a consistent view
 227  *  of driver internal data structures when we restart it.
 228  *  Thus these macros.
 229  */
 230 #define OUTL_DSP(np, v)                         \
 231         do {                                    \
 232                 MEMORY_WRITE_BARRIER();         \
 233                 OUTL(np, nc_dsp, (v));          \
 234         } while (0)
 235
 236 #define OUTONB_STD()                            \
 237         do {                                    \
 238                 MEMORY_WRITE_BARRIER();         \
 239                 OUTONB(np, nc_dcntl, (STD|NOCOM));      \
 240         } while (0)
 241
 242 /*
 243  *  Command control block states.
 244  */
 245 #define HS_IDLE         (0)
 246 #define HS_BUSY         (1)
 247 #define HS_NEGOTIATE    (2)     /* sync/wide data transfer*/
 248 #define HS_DISCONNECT   (3)     /* Disconnected by target */
 249 #define HS_WAIT         (4)     /* waiting for resource   */
 250
 251 #define HS_DONEMASK     (0x80)
 252 #define HS_COMPLETE     (4|HS_DONEMASK)
 253 #define HS_SEL_TIMEOUT  (5|HS_DONEMASK) /* Selection timeout      */
 254 #define HS_UNEXPECTED   (6|HS_DONEMASK) /* Unexpected disconnect  */
 255 #define HS_COMP_ERR     (7|HS_DONEMASK) /* Completed with error   */
 256
 257 /*
 258  *  Software Interrupt Codes
 259  */
 260 #define SIR_BAD_SCSI_STATUS     (1)
 261 #define SIR_SEL_ATN_NO_MSG_OUT  (2)
 262 #define SIR_MSG_RECEIVED        (3)
 263 #define SIR_MSG_WEIRD           (4)
 264 #define SIR_NEGO_FAILED         (5)
 265 #define SIR_NEGO_PROTO          (6)
 266 #define SIR_SCRIPT_STOPPED      (7)
 267 #define SIR_REJECT_TO_SEND      (8)
 268 #define SIR_SWIDE_OVERRUN       (9)
 269 #define SIR_SODL_UNDERRUN       (10)
 270 #define SIR_RESEL_NO_MSG_IN     (11)
 271 #define SIR_RESEL_NO_IDENTIFY   (12)
 272 #define SIR_RESEL_BAD_LUN       (13)
 273 #define SIR_TARGET_SELECTED     (14)
 274 #define SIR_RESEL_BAD_I_T_L     (15)
 275 #define SIR_RESEL_BAD_I_T_L_Q   (16)
 276 #define SIR_ABORT_SENT          (17)
 277 #define SIR_RESEL_ABORTED       (18)
 278 #define SIR_MSG_OUT_DONE        (19)
 279 #define SIR_COMPLETE_ERROR      (20)
 280 #define SIR_DATA_OVERRUN        (21)
 281 #define SIR_BAD_PHASE           (22)
 282 #if     SYM_CONF_DMA_ADDRESSING_MODE == 2
 283 #define SIR_DMAP_DIRTY          (23)
 284 #define SIR_MAX                 (23)
 285 #else
 286 #define SIR_MAX                 (22)
 287 #endif
 288
 289 /*
 290  *  Extended error bit codes.
 291  *  xerr_status field of struct sym_ccb.
 292  */
 293 #define XE_EXTRA_DATA   (1)     /* unexpected data phase         */
 294 #define XE_BAD_PHASE    (1<<1)  /* illegal phase (4/5)           */
 295 #define XE_PARITY_ERR   (1<<2)  /* unrecovered SCSI parity error */
 296 #define XE_SODL_UNRUN   (1<<3)  /* ODD transfer in DATA OUT phase */
 297 #define XE_SWIDE_OVRUN  (1<<4)  /* ODD transfer in DATA IN phase */
 298
 299 /*
 300  *  Negotiation status.
 301  *  nego_status field of struct sym_ccb.
 302  */
 303 #define NS_SYNC         (1)
 304 #define NS_WIDE         (2)
 305 #define NS_PPR          (3)
 306
 307 /*
 308  *  A CCB hashed table is used to retrieve CCB address
 309  *  from DSA value.
 310  */
 311 #define CCB_HASH_SHIFT          8
 312 #define CCB_HASH_SIZE           (1UL << CCB_HASH_SHIFT)
 313 #define CCB_HASH_MASK           (CCB_HASH_SIZE-1)
 314 #if 1
 315 #define CCB_HASH_CODE(dsa)      \
 316         (((dsa) >> (_LGRU16_(sizeof(struct sym_ccb)))) & CCB_HASH_MASK)
 317 #else
 318 #define CCB_HASH_CODE(dsa)      (((dsa) >> 9) & CCB_HASH_MASK)
 319 #endif
 320
 321 #if     SYM_CONF_DMA_ADDRESSING_MODE == 2
 322 /*
 323  *  We may want to use segment registers for 64 bit DMA.
 324  *  16 segments registers -> up to 64 GB addressable.
 325  */
 326 #define SYM_DMAP_SHIFT  (4)
 327 #define SYM_DMAP_SIZE   (1u<<SYM_DMAP_SHIFT)
 328 #define SYM_DMAP_MASK   (SYM_DMAP_SIZE-1)
 329 #endif
 330
 331 /*
 332  *  Device flags.
 333  */
 334 #define SYM_DISC_ENABLED        (1)
 335 #define SYM_TAGS_ENABLED        (1<<1)
 336 #define SYM_SCAN_BOOT_DISABLED  (1<<2)
 337 #define SYM_SCAN_LUNS_DISABLED  (1<<3)
 338
 339 /*
 340  *  Host adapter miscellaneous flags.
 341  */
 342 #define SYM_AVOID_BUS_RESET     (1)
 343
 344 /*
 345  *  Misc.
 346  */
 347 #define SYM_SNOOP_TIMEOUT (10000000)
 348 #define BUS_8_BIT       0
 349 #define BUS_16_BIT      1
 350
 351 /*
 352  *  Gather negotiable parameters value
 353  */
 354 struct sym_trans {
 355         u8 period;
 356         u8 offset;
 357         unsigned int width:1;
 358         unsigned int iu:1;
 359         unsigned int dt:1;
 360         unsigned int qas:1;
 361         unsigned int check_nego:1;
 362 };
 363
 364 /*
 365  *  Global TCB HEADER.
 366  *
 367  *  Due to lack of indirect addressing on earlier NCR chips,
 368  *  this substructure is copied from the TCB to a global
 369  *  address after selection.
 370  *  For SYMBIOS chips that support LOAD/STORE this copy is
 371  *  not needed and thus not performed.
 372  */
 373 struct sym_tcbh {
 374         /*
 375          *  Scripts bus addresses of LUN table accessed from scripts.
 376          *  LUN #0 is a special case, since multi-lun devices are rare,
 377          *  and we we want to speed-up the general case and not waste
 378          *  resources.
 379          */
 380         u32     luntbl_sa;      /* bus address of this table    */
 381         u32     lun0_sa;        /* bus address of LCB #0        */
 382         /*
 383          *  Actual SYNC/WIDE IO registers value for this target.
 384          *  'sval', 'wval' and 'uval' are read from SCRIPTS and
 385          *  so have alignment constraints.
 386          */
 387 /*0*/   u_char  uval;           /* -> SCNTL4 register           */
 388 /*1*/   u_char  sval;           /* -> SXFER  io register        */
 389 /*2*/   u_char  filler1;
 390 /*3*/   u_char  wval;           /* -> SCNTL3 io register        */
 391 };
 392
 393 /*
 394  *  Target Control Block
 395  */
 396 struct sym_tcb {
 397         /*
 398          *  TCB header.
 399          *  Assumed at offset 0.
 400          */
 401 /*0*/   struct sym_tcbh head;
 402
 403         /*
 404          *  LUN table used by the SCRIPTS processor.
 405          *  An array of bus addresses is used on reselection.
 406          */
 407         u32     *luntbl;        /* LCBs bus address table       */
 408
 409         /*
 410          *  LUN table used by the C code.
 411          */
 412         struct sym_lcb *lun0p;          /* LCB of LUN #0 (usual case)   */
 413 #if SYM_CONF_MAX_LUN > 1
 414         struct sym_lcb **lunmp;         /* Other LCBs [1..MAX_LUN]      */
 415 #endif
 416
 417         /*
 418          *  Bitmap that tells about LUNs that succeeded at least
 419          *  1 IO and therefore assumed to be a real device.
 420          *  Avoid useless allocation of the LCB structure.
 421          */
 422         u32     lun_map[(SYM_CONF_MAX_LUN+31)/32];
 423
 424         /*
 425          *  Bitmap that tells about LUNs that haven't yet an LCB
 426          *  allocated (not discovered or LCB allocation failed).
 427          */
 428         u32     busy0_map[(SYM_CONF_MAX_LUN+31)/32];
 429
 430 #ifdef  SYM_HAVE_STCB
 431         /*
 432          *  O/S specific data structure.
 433          */
 434         struct sym_stcb s;
 435 #endif
 436
 437         /* Transfer goal */
 438         struct sym_trans tgoal;
 439
 440         /*
 441          * Keep track of the CCB used for the negotiation in order
 442          * to ensure that only 1 negotiation is queued at a time.
 443          */
 444         struct sym_ccb *  nego_cp;      /* CCB used for the nego                */
 445
 446         /*
 447          *  Set when we want to reset the device.
 448          */
 449         u_char  to_reset;
 450
 451         /*
 452          *  Other user settable limits and options.
 453          *  These limits are read from the NVRAM if present.
 454          */
 455         u_char  usrflags;
 456         u_short usrtags;
 457         struct scsi_target *starget;
 458 };
 459
 460 /*
 461  *  Global LCB HEADER.
 462  *
 463  *  Due to lack of indirect addressing on earlier NCR chips,
 464  *  this substructure is copied from the LCB to a global
 465  *  address after selection.
 466  *  For SYMBIOS chips that support LOAD/STORE this copy is
 467  *  not needed and thus not performed.
 468  */
 469 struct sym_lcbh {
 470         /*
 471          *  SCRIPTS address jumped by SCRIPTS on reselection.
 472          *  For not probed logical units, this address points to
 473          *  SCRIPTS that deal with bad LU handling (must be at
 474          *  offset zero of the LCB for that reason).
 475          */
 476 /*0*/   u32     resel_sa;
 477
 478         /*
 479          *  Task (bus address of a CCB) read from SCRIPTS that points
 480          *  to the unique ITL nexus allowed to be disconnected.
 481          */
 482         u32     itl_task_sa;
 483
 484         /*
 485          *  Task table bus address (read from SCRIPTS).
 486          */
 487         u32     itlq_tbl_sa;
 488 };
 489
 490 /*
 491  *  Logical Unit Control Block
 492  */
 493 struct sym_lcb {
 494         /*
 495          *  TCB header.
 496          *  Assumed at offset 0.
 497          */
 498 /*0*/   struct sym_lcbh head;
 499
 500         /*
 501          *  Task table read from SCRIPTS that contains pointers to
 502          *  ITLQ nexuses. The bus address read from SCRIPTS is
 503          *  inside the header.
 504          */
 505         u32     *itlq_tbl;      /* Kernel virtual address       */
 506
 507         /*
 508          *  Busy CCBs management.
 509          */
 510         u_short busy_itlq;      /* Number of busy tagged CCBs   */
 511         u_short busy_itl;       /* Number of busy untagged CCBs */
 512
 513         /*
 514          *  Circular tag allocation buffer.
 515          */
 516         u_short ia_tag;         /* Tag allocation index         */
 517         u_short if_tag;         /* Tag release index            */
 518         u_char  *cb_tags;       /* Circular tags buffer         */
 519
 520         /*
 521          *  O/S specific data structure.
 522          */
 523 #ifdef  SYM_HAVE_SLCB
 524         struct sym_slcb s;
 525 #endif
 526
 527 #ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
 528         /*
 529          *  Optionnaly the driver can handle device queueing,
 530          *  and requeues internally command to redo.
 531          */
 532         SYM_QUEHEAD waiting_ccbq;
 533         SYM_QUEHEAD started_ccbq;
 534         int     num_sgood;
 535         u_short started_tags;
 536         u_short started_no_tag;
 537         u_short started_max;
 538         u_short started_limit;
 539 #endif
 540
 541 #ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
 542         /*
 543          *  Optionally the driver can try to prevent SCSI
 544          *  IOs from being reordered too much.
 545          */
 546         u_char          tags_si;        /* Current index to tags sum    */
 547         u_short         tags_sum[2];    /* Tags sum counters            */
 548         u_short         tags_since;     /* # of tags since last switch  */
 549 #endif
 550
 551         /*
 552          *  Set when we want to clear all tasks.
 553          */
 554         u_char to_clear;
 555
 556         /*
 557          *  Capabilities.
 558          */
 559         u_char  user_flags;
 560         u_char  curr_flags;
 561 };
 562
 563 /*
 564  *  Action from SCRIPTS on a task.
 565  *  Is part of the CCB, but is also used separately to plug
 566  *  error handling action to perform from SCRIPTS.
 567  */
 568 struct sym_actscr {
 569         u32     start;          /* Jumped by SCRIPTS after selection    */
 570         u32     restart;        /* Jumped by SCRIPTS on relection       */
 571 };
 572
 573 /*
 574  *  Phase mismatch context.
 575  *
 576  *  It is part of the CCB and is used as parameters for the
 577  *  DATA pointer. We need two contexts to handle correctly the
 578  *  SAVED DATA POINTER.
 579  */
 580 struct sym_pmc {
 581         struct  sym_tblmove sg; /* Updated interrupted SG block */
 582         u32     ret;            /* SCRIPT return address        */
 583 };
 584
 585 /*
 586  *  LUN control block lookup.
 587  *  We use a direct pointer for LUN #0, and a table of
 588  *  pointers which is only allocated for devices that support
 589  *  LUN(s) > 0.
 590  */
 591 #if SYM_CONF_MAX_LUN <= 1
 592 #define sym_lp(tp, lun) (!lun) ? (tp)->lun0p : NULL
 593 #else
 594 #define sym_lp(tp, lun) \
 595         (!lun) ? (tp)->lun0p : (tp)->lunmp ? (tp)->lunmp[(lun)] : NULL
 596 #endif
 597
 598 /*
 599  *  Status are used by the host and the script processor.
 600  *
 601  *  The last four bytes (status[4]) are copied to the
 602  *  scratchb register (declared as scr0..scr3) just after the
 603  *  select/reselect, and copied back just after disconnecting.
 604  *  Inside the script the XX_REG are used.
 605  */
 606
 607 /*
 608  *  Last four bytes (script)
 609  */
 610 #define  HX_REG scr0
 611 #define  HX_PRT nc_scr0
 612 #define  HS_REG scr1
 613 #define  HS_PRT nc_scr1
 614 #define  SS_REG scr2
 615 #define  SS_PRT nc_scr2
 616 #define  HF_REG scr3
 617 #define  HF_PRT nc_scr3
 618
 619 /*
 620  *  Last four bytes (host)
 621  */
 622 #define  host_xflags   phys.head.status[0]
 623 #define  host_status   phys.head.status[1]
 624 #define  ssss_status   phys.head.status[2]
 625 #define  host_flags    phys.head.status[3]
 626
 627 /*
 628  *  Host flags
 629  */
 630 #define HF_IN_PM0       1u
 631 #define HF_IN_PM1       (1u<<1)
 632 #define HF_ACT_PM       (1u<<2)
 633 #define HF_DP_SAVED     (1u<<3)
 634 #define HF_SENSE        (1u<<4)
 635 #define HF_EXT_ERR      (1u<<5)
 636 #define HF_DATA_IN      (1u<<6)
 637 #ifdef SYM_CONF_IARB_SUPPORT
 638 #define HF_HINT_IARB    (1u<<7)
 639 #endif
 640
 641 /*
 642  *  More host flags
 643  */
 644 #if     SYM_CONF_DMA_ADDRESSING_MODE == 2
 645 #define HX_DMAP_DIRTY   (1u<<7)
 646 #endif
 647
 648 /*
 649  *  Global CCB HEADER.
 650  *
 651  *  Due to lack of indirect addressing on earlier NCR chips,
 652  *  this substructure is copied from the ccb to a global
 653  *  address after selection (or reselection) and copied back
 654  *  before disconnect.
 655  *  For SYMBIOS chips that support LOAD/STORE this copy is
 656  *  not needed and thus not performed.
 657  */
 658
 659 struct sym_ccbh {
 660         /*
 661          *  Start and restart SCRIPTS addresses (must be at 0).
 662          */
 663 /*0*/   struct sym_actscr go;
 664
 665         /*
 666          *  SCRIPTS jump address that deal with data pointers.
 667          *  'savep' points to the position in the script responsible
 668          *  for the actual transfer of data.
 669          *  It's written on reception of a SAVE_DATA_POINTER message.
 670          */
 671         u32     savep;          /* Jump address to saved data pointer   */
 672         u32     lastp;          /* SCRIPTS address at end of data       */
 673 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
 674         u32     wlastp;
 675 #endif
 676
 677         /*
 678          *  Status fields.
 679          */
 680         u8      status[4];
 681 };
 682
 683 /*
 684  *  GET/SET the value of the data pointer used by SCRIPTS.
 685  *
 686  *  We must distinguish between the LOAD/STORE-based SCRIPTS
 687  *  that use directly the header in the CCB, and the NCR-GENERIC
 688  *  SCRIPTS that use the copy of the header in the HCB.
 689  */
 690 #if     SYM_CONF_GENERIC_SUPPORT
 691 #define sym_set_script_dp(np, cp, dp)                           \
 692         do {                                                    \
 693                 if (np->features & FE_LDSTR)                    \
 694                         cp->phys.head.lastp = cpu_to_scr(dp);   \
 695                 else                                            \
 696                         np->ccb_head.lastp = cpu_to_scr(dp);    \
 697         } while (0)
 698 #define sym_get_script_dp(np, cp)                               \
 699         scr_to_cpu((np->features & FE_LDSTR) ?                  \
 700                 cp->phys.head.lastp : np->ccb_head.lastp)
 701 #else
 702 #define sym_set_script_dp(np, cp, dp)                           \
 703         do {                                                    \
 704                 cp->phys.head.lastp = cpu_to_scr(dp);           \
 705         } while (0)
 706
 707 #define sym_get_script_dp(np, cp) (cp->phys.head.lastp)
 708 #endif
 709
 710 /*
 711  *  Data Structure Block
 712  *
 713  *  During execution of a ccb by the script processor, the
 714  *  DSA (data structure address) register points to this
 715  *  substructure of the ccb.
 716  */
 717 struct sym_dsb {
 718         /*
 719          *  CCB header.
 720          *  Also assumed at offset 0 of the sym_ccb structure.
 721          */
 722 /*0*/   struct sym_ccbh head;
 723
 724         /*
 725          *  Phase mismatch contexts.
 726          *  We need two to handle correctly the SAVED DATA POINTER.
 727          *  MUST BOTH BE AT OFFSET < 256, due to using 8 bit arithmetic
 728          *  for address calculation from SCRIPTS.
 729          */
 730         struct sym_pmc pm0;
 731         struct sym_pmc pm1;
 732
 733         /*
 734          *  Table data for Script
 735          */
 736         struct sym_tblsel  select;
 737         struct sym_tblmove smsg;
 738         struct sym_tblmove smsg_ext;
 739         struct sym_tblmove cmd;
 740         struct sym_tblmove sense;
 741         struct sym_tblmove wresid;
 742         struct sym_tblmove data [SYM_CONF_MAX_SG];
 743 };
 744
 745 /*
 746  *  Our Command Control Block
 747  */
 748 struct sym_ccb {
 749         /*
 750          *  This is the data structure which is pointed by the DSA
 751          *  register when it is executed by the script processor.
 752          *  It must be the first entry.
 753          */
 754         struct sym_dsb phys;
 755
 756         /*
 757          *  Pointer to CAM ccb and related stuff.
 758          */
 759         struct scsi_cmnd *cmd;  /* CAM scsiio ccb               */
 760         u8      cdb_buf[16];    /* Copy of CDB                  */
 761 #define SYM_SNS_BBUF_LEN 32
 762         u8      sns_bbuf[SYM_SNS_BBUF_LEN]; /* Bounce buffer for sense data */
 763         int     data_len;       /* Total data length            */
 764         int     segments;       /* Number of SG segments        */
 765
 766         u8      order;          /* Tag type (if tagged command) */
 767         unsigned char odd_byte_adjustment;      /* odd-sized req on wide bus */
 768
 769         u_char  nego_status;    /* Negotiation status           */
 770         u_char  xerr_status;    /* Extended error flags         */
 771         u32     extra_bytes;    /* Extraneous bytes transferred */
 772
 773         /*
 774          *  Message areas.
 775          *  We prepare a message to be sent after selection.
 776          *  We may use a second one if the command is rescheduled
 777          *  due to CHECK_CONDITION or COMMAND TERMINATED.
 778          *  Contents are IDENTIFY and SIMPLE_TAG.
 779          *  While negotiating sync or wide transfer,
 780          *  a SDTR or WDTR message is appended.
 781          */
 782         u_char  scsi_smsg [12];
 783         u_char  scsi_smsg2[12];
 784
 785         /*
 786          *  Auto request sense related fields.
 787          */
 788         u_char  sensecmd[6];    /* Request Sense command        */
 789         u_char  sv_scsi_status; /* Saved SCSI status            */
 790         u_char  sv_xerr_status; /* Saved extended status        */
 791         int     sv_resid;       /* Saved residual               */
 792
 793         /*
 794          *  Other fields.
 795          */
 796         u32     ccb_ba;         /* BUS address of this CCB      */
 797         u_short tag;            /* Tag for this transfer        */
 798                                 /*  NO_TAG means no tag         */
 799         u_char  target;
 800         u_char  lun;
 801         struct sym_ccb *link_ccbh;      /* Host adapter CCB hash chain  */
 802         SYM_QUEHEAD link_ccbq;  /* Link to free/busy CCB queue  */
 803         u32     startp;         /* Initial data pointer         */
 804         u32     goalp;          /* Expected last data pointer   */
 805 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
 806         u32     wgoalp;
 807 #endif
 808         int     ext_sg;         /* Extreme data pointer, used   */
 809         int     ext_ofs;        /*  to calculate the residual.  */
 810 #ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
 811         SYM_QUEHEAD link2_ccbq; /* Link for device queueing     */
 812         u_char  started;        /* CCB queued to the squeue     */
 813 #endif
 814         u_char  to_abort;       /* Want this IO to be aborted   */
 815 #ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
 816         u_char  tags_si;        /* Lun tags sum index (0,1)     */
 817 #endif
 818 };
 819
 820 #define CCB_BA(cp,lbl)  cpu_to_scr(cp->ccb_ba + offsetof(struct sym_ccb, lbl))
 821
 822 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
 823 #define sym_goalp(cp) ((cp->host_flags & HF_DATA_IN) ? cp->goalp : cp->wgoalp)
 824 #else
 825 #define sym_goalp(cp) (cp->goalp)
 826 #endif
 827
 828 typedef struct device *m_pool_ident_t;
 829
 830 /*
 831  *  Host Control Block
 832  */
 833 struct sym_hcb {
 834         /*
 835          *  Global headers.
 836          *  Due to poorness of addressing capabilities, earlier
 837          *  chips (810, 815, 825) copy part of the data structures
 838          *  (CCB, TCB and LCB) in fixed areas.
 839          */
 840 #if     SYM_CONF_GENERIC_SUPPORT
 841         struct sym_ccbh ccb_head;
 842         struct sym_tcbh tcb_head;
 843         struct sym_lcbh lcb_head;
 844 #endif
 845         /*
 846          *  Idle task and invalid task actions and
 847          *  their bus addresses.
 848          */
 849         struct sym_actscr idletask, notask, bad_itl, bad_itlq;
 850         u32 idletask_ba, notask_ba, bad_itl_ba, bad_itlq_ba;
 851
 852         /*
 853          *  Dummy lun table to protect us against target
 854          *  returning bad lun number on reselection.
 855          */
 856         u32     *badluntbl;     /* Table physical address       */
 857         u32     badlun_sa;      /* SCRIPT handler BUS address   */
 858
 859         /*
 860          *  Bus address of this host control block.
 861          */
 862         u32     hcb_ba;
 863
 864         /*
 865          *  Bit 32-63 of the on-chip RAM bus address in LE format.
 866          *  The START_RAM64 script loads the MMRS and MMWS from this
 867          *  field.
 868          */
 869         u32     scr_ram_seg;
 870
 871         /*
 872          *  Initial value of some IO register bits.
 873          *  These values are assumed to have been set by BIOS, and may
 874          *  be used to probe adapter implementation differences.
 875          */
 876         u_char  sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest3, sv_ctest4,
 877                 sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4, sv_scntl4,
 878                 sv_stest1;
 879
 880         /*
 881          *  Actual initial value of IO register bits used by the
 882          *  driver. They are loaded at initialisation according to
 883          *  features that are to be enabled/disabled.
 884          */
 885         u_char  rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest3, rv_ctest4,
 886                 rv_ctest5, rv_stest2, rv_ccntl0, rv_ccntl1, rv_scntl4;
 887
 888         /*
 889          *  Target data.
 890          */
 891         struct sym_tcb  target[SYM_CONF_MAX_TARGET];
 892
 893         /*
 894          *  Target control block bus address array used by the SCRIPT
 895          *  on reselection.
 896          */
 897         u32             *targtbl;
 898         u32             targtbl_ba;
 899
 900         /*
 901          *  DMA pool handle for this HBA.
 902          */
 903         m_pool_ident_t  bus_dmat;
 904
 905         /*
 906          *  O/S specific data structure
 907          */
 908         struct sym_shcb s;
 909
 910         /*
 911          *  Physical bus addresses of the chip.
 912          */
 913         u32             mmio_ba;        /* MMIO 32 bit BUS address      */
 914         int             mmio_ws;        /* MMIO Window size             */
 915
 916         u32             ram_ba;         /* RAM 32 bit BUS address       */
 917         int             ram_ws;         /* RAM window size              */
 918
 919         /*
 920          *  SCRIPTS virtual and physical bus addresses.
 921          *  'script'  is loaded in the on-chip RAM if present.
 922          *  'scripth' stays in main memory for all chips except the
 923          *  53C895A, 53C896 and 53C1010 that provide 8K on-chip RAM.
 924          */
 925         u_char          *scripta0;      /* Copy of scripts A, B, Z      */
 926         u_char          *scriptb0;
 927         u_char          *scriptz0;
 928         u32             scripta_ba;     /* Actual scripts A, B, Z       */
 929         u32             scriptb_ba;     /* 32 bit bus addresses.        */
 930         u32             scriptz_ba;
 931         u_short         scripta_sz;     /* Actual size of script A, B, Z*/
 932         u_short         scriptb_sz;
 933         u_short         scriptz_sz;
 934
 935         /*
 936          *  Bus addresses, setup and patch methods for
 937          *  the selected firmware.
 938          */
 939         struct sym_fwa_ba fwa_bas;      /* Useful SCRIPTA bus addresses */
 940         struct sym_fwb_ba fwb_bas;      /* Useful SCRIPTB bus addresses */
 941         struct sym_fwz_ba fwz_bas;      /* Useful SCRIPTZ bus addresses */
 942         void            (*fw_setup)(struct sym_hcb *np, struct sym_fw *fw);
 943         void            (*fw_patch)(struct sym_hcb *np);
 944         char            *fw_name;
 945
 946         /*
 947          *  General controller parameters and configuration.
 948          */
 949         u_short device_id;      /* PCI device id                */
 950         u_char  revision_id;    /* PCI device revision id       */
 951         u_int   features;       /* Chip features map            */
 952         u_char  myaddr;         /* SCSI id of the adapter       */
 953         u_char  maxburst;       /* log base 2 of dwords burst   */
 954         u_char  maxwide;        /* Maximum transfer width       */
 955         u_char  minsync;        /* Min sync period factor (ST)  */
 956         u_char  maxsync;        /* Max sync period factor (ST)  */
 957         u_char  maxoffs;        /* Max scsi offset        (ST)  */
 958         u_char  minsync_dt;     /* Min sync period factor (DT)  */
 959         u_char  maxsync_dt;     /* Max sync period factor (DT)  */
 960         u_char  maxoffs_dt;     /* Max scsi offset        (DT)  */
 961         u_char  multiplier;     /* Clock multiplier (1,2,4)     */
 962         u_char  clock_divn;     /* Number of clock divisors     */
 963         u32     clock_khz;      /* SCSI clock frequency in KHz  */
 964         u32     pciclk_khz;     /* Estimated PCI clock  in KHz  */
 965         /*
 966          *  Start queue management.
 967          *  It is filled up by the host processor and accessed by the
 968          *  SCRIPTS processor in order to start SCSI commands.
 969          */
 970         volatile                /* Prevent code optimizations   */
 971         u32     *squeue;        /* Start queue virtual address  */
 972         u32     squeue_ba;      /* Start queue BUS address      */
 973         u_short squeueput;      /* Next free slot of the queue  */
 974         u_short actccbs;        /* Number of allocated CCBs     */
 975
 976         /*
 977          *  Command completion queue.
 978          *  It is the same size as the start queue to avoid overflow.
 979          */
 980         u_short dqueueget;      /* Next position to scan        */
 981         volatile                /* Prevent code optimizations   */
 982         u32     *dqueue;        /* Completion (done) queue      */
 983         u32     dqueue_ba;      /* Done queue BUS address       */
 984
 985         /*
 986          *  Miscellaneous buffers accessed by the scripts-processor.
 987          *  They shall be DWORD aligned, because they may be read or
 988          *  written with a script command.
 989          */
 990         u_char          msgout[8];      /* Buffer for MESSAGE OUT       */
 991         u_char          msgin [8];      /* Buffer for MESSAGE IN        */
 992         u32             lastmsg;        /* Last SCSI message sent       */
 993         u32             scratch;        /* Scratch for SCSI receive     */
 994                                         /* Also used for cache test     */
 995         /*
 996          *  Miscellaneous configuration and status parameters.
 997          */
 998         u_char          usrflags;       /* Miscellaneous user flags     */
 999         u_char          scsi_mode;      /* Current SCSI BUS mode        */
1000         u_char          verbose;        /* Verbosity for this controller*/
1001
1002         /*
1003          *  CCB lists and queue.
1004          */
1005         struct sym_ccb **ccbh;                  /* CCBs hashed by DSA value     */
1006                                         /* CCB_HASH_SIZE lists of CCBs  */
1007         SYM_QUEHEAD     free_ccbq;      /* Queue of available CCBs      */
1008         SYM_QUEHEAD     busy_ccbq;      /* Queue of busy CCBs           */
1009
1010         /*
1011          *  During error handling and/or recovery,
1012          *  active CCBs that are to be completed with
1013          *  error or requeued are moved from the busy_ccbq
1014          *  to the comp_ccbq prior to completion.
1015          */
1016         SYM_QUEHEAD     comp_ccbq;
1017
1018 #ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
1019         SYM_QUEHEAD     dummy_ccbq;
1020 #endif
1021
1022         /*
1023          *  IMMEDIATE ARBITRATION (IARB) control.
1024          *
1025          *  We keep track in 'last_cp' of the last CCB that has been
1026          *  queued to the SCRIPTS processor and clear 'last_cp' when
1027          *  this CCB completes. If last_cp is not zero at the moment
1028          *  we queue a new CCB, we set a flag in 'last_cp' that is
1029          *  used by the SCRIPTS as a hint for setting IARB.
1030          *  We donnot set more than 'iarb_max' consecutive hints for
1031          *  IARB in order to leave devices a chance to reselect.
1032          *  By the way, any non zero value of 'iarb_max' is unfair. :)
1033          */
1034 #ifdef SYM_CONF_IARB_SUPPORT
1035         u_short         iarb_max;       /* Max. # consecutive IARB hints*/
1036         u_short         iarb_count;     /* Actual # of these hints      */
1037         struct sym_ccb *        last_cp;
1038 #endif
1039
1040         /*
1041          *  Command abort handling.
1042          *  We need to synchronize tightly with the SCRIPTS
1043          *  processor in order to handle things correctly.
1044          */
1045         u_char          abrt_msg[4];    /* Message to send buffer       */
1046         struct sym_tblmove abrt_tbl;    /* Table for the MOV of it      */
1047         struct sym_tblsel  abrt_sel;    /* Sync params for selection    */
1048         u_char          istat_sem;      /* Tells the chip to stop (SEM) */
1049
1050         /*
1051          *  64 bit DMA handling.
1052          */
1053 #if     SYM_CONF_DMA_ADDRESSING_MODE != 0
1054         u_char  use_dac;                /* Use PCI DAC cycles           */
1055 #if     SYM_CONF_DMA_ADDRESSING_MODE == 2
1056         u_char  dmap_dirty;             /* Dma segments registers dirty */
1057         u32     dmap_bah[SYM_DMAP_SIZE];/* Segment registers map        */
1058 #endif
1059 #endif
1060 };
1061
1062 #define HCB_BA(np, lbl) (np->hcb_ba + offsetof(struct sym_hcb, lbl))
1063
1064
1065 /*
1066  *  FIRMWARES (sym_fw.c)
1067  */
1068 struct sym_fw * sym_find_firmware(struct sym_chip *chip);
1069 void sym_fw_bind_script(struct sym_hcb *np, u32 *start, int len);
1070
1071 /*
1072  *  Driver methods called from O/S specific code.
1073  */
1074 char *sym_driver_name(void);
1075 void sym_print_xerr(struct scsi_cmnd *cmd, int x_status);
1076 int sym_reset_scsi_bus(struct sym_hcb *np, int enab_int);
1077 struct sym_chip *sym_lookup_chip_table(u_short device_id, u_char revision);
1078 void sym_put_start_queue(struct sym_hcb *np, struct sym_ccb *cp);
1079 #ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
1080 void sym_start_next_ccbs(struct sym_hcb *np, struct sym_lcb *lp, int maxn);
1081 #endif
1082 void sym_start_up(struct sym_hcb *np, int reason);
1083 void sym_interrupt(struct sym_hcb *np);
1084 int sym_clear_tasks(struct sym_hcb *np, int cam_status, int target, int lun, int task);
1085 struct sym_ccb *sym_get_ccb(struct sym_hcb *np, struct scsi_cmnd *cmd, u_char tag_order);
1086 void sym_free_ccb(struct sym_hcb *np, struct sym_ccb *cp);
1087 struct sym_lcb *sym_alloc_lcb(struct sym_hcb *np, u_char tn, u_char ln);
1088 int sym_queue_scsiio(struct sym_hcb *np, struct scsi_cmnd *csio, struct sym_ccb *cp);
1089 int sym_abort_scsiio(struct sym_hcb *np, struct scsi_cmnd *ccb, int timed_out);
1090 int sym_reset_scsi_target(struct sym_hcb *np, int target);
1091 void sym_hcb_free(struct sym_hcb *np);
1092 int sym_hcb_attach(struct Scsi_Host *shost, struct sym_fw *fw, struct sym_nvram *nvram);
1093
1094 /*
1095  *  Build a scatter/gather entry.
1096  *
1097  *  For 64 bit systems, we use the 8 upper bits of the size field
1098  *  to provide bus address bits 32-39 to the SCRIPTS processor.
1099  *  This allows the 895A, 896, 1010 to address up to 1 TB of memory.
1100  */
1101
1102 #if   SYM_CONF_DMA_ADDRESSING_MODE == 0
1103 #define sym_build_sge(np, data, badd, len)      \
1104 do {                                            \
1105         (data)->addr = cpu_to_scr(badd);        \
1106         (data)->size = cpu_to_scr(len);         \
1107 } while (0)
1108 #elif SYM_CONF_DMA_ADDRESSING_MODE == 1
1109 #define sym_build_sge(np, data, badd, len)                              \
1110 do {                                                                    \
1111         (data)->addr = cpu_to_scr(badd);                                \
1112         (data)->size = cpu_to_scr((((badd) >> 8) & 0xff000000) + len);  \
1113 } while (0)
1114 #elif SYM_CONF_DMA_ADDRESSING_MODE == 2
1115 int sym_lookup_dmap(struct sym_hcb *np, u32 h, int s);
1116 static __inline void
1117 sym_build_sge(struct sym_hcb *np, struct sym_tblmove *data, u64 badd, int len)
1118 {
1119         u32 h = (badd>>32);
1120         int s = (h&SYM_DMAP_MASK);
1121
1122         if (h != np->dmap_bah[s])
1123                 goto bad;
1124 good:
1125         (data)->addr = cpu_to_scr(badd);
1126         (data)->size = cpu_to_scr((s<<24) + len);
1127         return;
1128 bad:
1129         s = sym_lookup_dmap(np, h, s);
1130         goto good;
1131 }
1132 #else
1133 #error "Unsupported DMA addressing mode"
1134 #endif
1135
1136 /*
1137  *  Set up data pointers used by SCRIPTS.
1138  *  Called from O/S specific code.
1139  */
1140 static inline void sym_setup_data_pointers(struct sym_hcb *np,
1141                 struct sym_ccb *cp, int dir)
1142 {
1143         u32 lastp, goalp;
1144
1145         /*
1146          *  No segments means no data.
1147          */
1148         if (!cp->segments)
1149                 dir = DMA_NONE;
1150
1151         /*
1152          *  Set the data pointer.
1153          */
1154         switch(dir) {
1155 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
1156         case DMA_BIDIRECTIONAL:
1157 #endif
1158         case DMA_TO_DEVICE:
1159                 goalp = SCRIPTA_BA(np, data_out2) + 8;
1160                 lastp = goalp - 8 - (cp->segments * (2*4));
1161 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
1162                 cp->wgoalp = cpu_to_scr(goalp);
1163                 if (dir != DMA_BIDIRECTIONAL)
1164                         break;
1165                 cp->phys.head.wlastp = cpu_to_scr(lastp);
1166                 /* fall through */
1167 #else
1168                 break;
1169 #endif
1170         case DMA_FROM_DEVICE:
1171                 cp->host_flags |= HF_DATA_IN;
1172                 goalp = SCRIPTA_BA(np, data_in2) + 8;
1173                 lastp = goalp - 8 - (cp->segments * (2*4));
1174                 break;
1175         case DMA_NONE:
1176         default:
1177 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
1178                 cp->host_flags |= HF_DATA_IN;
1179 #endif
1180                 lastp = goalp = SCRIPTB_BA(np, no_data);
1181                 break;
1182         }
1183
1184         /*
1185          *  Set all pointers values needed by SCRIPTS.
1186          */
1187         cp->phys.head.lastp = cpu_to_scr(lastp);
1188         cp->phys.head.savep = cpu_to_scr(lastp);
1189         cp->startp          = cp->phys.head.savep;
1190         cp->goalp           = cpu_to_scr(goalp);
1191
1192 #ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
1193         /*
1194          *  If direction is unknown, start at data_io.
1195          */
1196         if (dir == DMA_BIDIRECTIONAL)
1197                 cp->phys.head.savep = cpu_to_scr(SCRIPTB_BA(np, data_io));
1198 #endif
1199 }
1200
1201 /*
1202  *  MEMORY ALLOCATOR.
1203  */
1204
1205 #define sym_get_mem_cluster()   \
1206         (void *) __get_free_pages(GFP_ATOMIC, SYM_MEM_PAGE_ORDER)
1207 #define sym_free_mem_cluster(p) \
1208         free_pages((unsigned long)p, SYM_MEM_PAGE_ORDER)
1209
1210 /*
1211  *  Link between free memory chunks of a given size.
1212  */
1213 typedef struct sym_m_link {
1214         struct sym_m_link *next;
1215 } *m_link_p;
1216
1217 /*
1218  *  Virtual to bus physical translation for a given cluster.
1219  *  Such a structure is only useful with DMA abstraction.
1220  */
1221 typedef struct sym_m_vtob {     /* Virtual to Bus address translation */
1222         struct sym_m_vtob *next;
1223         void *vaddr;            /* Virtual address */
1224         dma_addr_t baddr;       /* Bus physical address */
1225 } *m_vtob_p;
1226
1227 /* Hash this stuff a bit to speed up translations */
1228 #define VTOB_HASH_SHIFT         5
1229 #define VTOB_HASH_SIZE          (1UL << VTOB_HASH_SHIFT)
1230 #define VTOB_HASH_MASK          (VTOB_HASH_SIZE-1)
1231 #define VTOB_HASH_CODE(m)       \
1232         ((((unsigned long)(m)) >> SYM_MEM_CLUSTER_SHIFT) & VTOB_HASH_MASK)
1233
1234 /*
1235  *  Memory pool of a given kind.
1236  *  Ideally, we want to use:
1237  *  1) 1 pool for memory we donnot need to involve in DMA.
1238  *  2) The same pool for controllers that require same DMA
1239  *     constraints and features.
1240  *     The OS specific m_pool_id_t thing and the sym_m_pool_match()
1241  *     method are expected to tell the driver about.
1242  */
1243 typedef struct sym_m_pool {
1244         m_pool_ident_t  dev_dmat;       /* Identifies the pool (see above) */
1245         void * (*get_mem_cluster)(struct sym_m_pool *);
1246 #ifdef  SYM_MEM_FREE_UNUSED
1247         void (*free_mem_cluster)(struct sym_m_pool *, void *);
1248 #endif
1249 #define M_GET_MEM_CLUSTER()             mp->get_mem_cluster(mp)
1250 #define M_FREE_MEM_CLUSTER(p)           mp->free_mem_cluster(mp, p)
1251         int nump;
1252         m_vtob_p vtob[VTOB_HASH_SIZE];
1253         struct sym_m_pool *next;
1254         struct sym_m_link h[SYM_MEM_CLUSTER_SHIFT - SYM_MEM_SHIFT + 1];
1255 } *m_pool_p;
1256
1257 /*
1258  *  Alloc, free and translate addresses to bus physical
1259  *  for DMAable memory.
1260  */
1261 void *__sym_calloc_dma(m_pool_ident_t dev_dmat, int size, char *name);
1262 void __sym_mfree_dma(m_pool_ident_t dev_dmat, void *m, int size, char *name);
1263 dma_addr_t __vtobus(m_pool_ident_t dev_dmat, void *m);
1264
1265 /*
1266  * Verbs used by the driver code for DMAable memory handling.
1267  * The _uvptv_ macro avoids a nasty warning about pointer to volatile
1268  * being discarded.
1269  */
1270 #define _uvptv_(p) ((void *)((u_long)(p)))
1271
1272 #define _sym_calloc_dma(np, l, n)       __sym_calloc_dma(np->bus_dmat, l, n)
1273 #define _sym_mfree_dma(np, p, l, n)     \
1274                         __sym_mfree_dma(np->bus_dmat, _uvptv_(p), l, n)
1275 #define sym_calloc_dma(l, n)            _sym_calloc_dma(np, l, n)
1276 #define sym_mfree_dma(p, l, n)          _sym_mfree_dma(np, p, l, n)
1277 #define vtobus(p)                       __vtobus(np->bus_dmat, _uvptv_(p))
1278
1279 /*
1280  *  We have to provide the driver memory allocator with methods for
1281  *  it to maintain virtual to bus physical address translations.
1282  */
1283
1284 #define sym_m_pool_match(mp_id1, mp_id2)        (mp_id1 == mp_id2)
1285
1286 static __inline void *sym_m_get_dma_mem_cluster(m_pool_p mp, m_vtob_p vbp)
1287 {
1288         void *vaddr = NULL;
1289         dma_addr_t baddr = 0;
1290
1291         vaddr = dma_alloc_coherent(mp->dev_dmat, SYM_MEM_CLUSTER_SIZE, &baddr,
1292                         GFP_ATOMIC);
1293         if (vaddr) {
1294                 vbp->vaddr = vaddr;
1295                 vbp->baddr = baddr;
1296         }
1297         return vaddr;
1298 }
1299
1300 static __inline void sym_m_free_dma_mem_cluster(m_pool_p mp, m_vtob_p vbp)
1301 {
1302         dma_free_coherent(mp->dev_dmat, SYM_MEM_CLUSTER_SIZE, vbp->vaddr,
1303                         vbp->baddr);
1304 }
1305
1306 #endif /* SYM_HIPD_H */