drivers/scsi/esp_scsi.h

   1 /* esp_scsi.h: Defines and structures for the ESP drier.
   2  *
   3  * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #ifndef _ESP_SCSI_H
   7 #define _ESP_SCSI_H
   8
   9                                         /* Access    Description      Offset */
  10 #define ESP_TCLOW       0x00UL          /* rw  Low bits transfer count 0x00  */
  11 #define ESP_TCMED       0x01UL          /* rw  Mid bits transfer count 0x04  */
  12 #define ESP_FDATA       0x02UL          /* rw  FIFO data bits          0x08  */
  13 #define ESP_CMD         0x03UL          /* rw  SCSI command bits       0x0c  */
  14 #define ESP_STATUS      0x04UL          /* ro  ESP status register     0x10  */
  15 #define ESP_BUSID       ESP_STATUS      /* wo  BusID for sel/resel     0x10  */
  16 #define ESP_INTRPT      0x05UL          /* ro  Kind of interrupt       0x14  */
  17 #define ESP_TIMEO       ESP_INTRPT      /* wo  Timeout for sel/resel   0x14  */
  18 #define ESP_SSTEP       0x06UL          /* ro  Sequence step register  0x18  */
  19 #define ESP_STP         ESP_SSTEP       /* wo  Transfer period/sync    0x18  */
  20 #define ESP_FFLAGS      0x07UL          /* ro  Bits current FIFO info  0x1c  */
  21 #define ESP_SOFF        ESP_FFLAGS      /* wo  Sync offset             0x1c  */
  22 #define ESP_CFG1        0x08UL          /* rw  First cfg register      0x20  */
  23 #define ESP_CFACT       0x09UL          /* wo  Clock conv factor       0x24  */
  24 #define ESP_STATUS2     ESP_CFACT       /* ro  HME status2 register    0x24  */
  25 #define ESP_CTEST       0x0aUL          /* wo  Chip test register      0x28  */
  26 #define ESP_CFG2        0x0bUL          /* rw  Second cfg register     0x2c  */
  27 #define ESP_CFG3        0x0cUL          /* rw  Third cfg register      0x30  */
  28 #define ESP_TCHI        0x0eUL          /* rw  High bits transf count  0x38  */
  29 #define ESP_UID         ESP_TCHI        /* ro  Unique ID code          0x38  */
  30 #define FAS_RLO         ESP_TCHI        /* rw  HME extended counter    0x38  */
  31 #define ESP_FGRND       0x0fUL          /* rw  Data base for fifo      0x3c  */
  32 #define FAS_RHI         ESP_FGRND       /* rw  HME extended counter    0x3c  */
  33
  34 #define SBUS_ESP_REG_SIZE       0x40UL
  35
  36 /* Bitfield meanings for the above registers. */
  37
  38 /* ESP config reg 1, read-write, found on all ESP chips */
  39 #define ESP_CONFIG1_ID        0x07      /* My BUS ID bits */
  40 #define ESP_CONFIG1_CHTEST    0x08      /* Enable ESP chip tests */
  41 #define ESP_CONFIG1_PENABLE   0x10      /* Enable parity checks */
  42 #define ESP_CONFIG1_PARTEST   0x20      /* Parity test mode enabled? */
  43 #define ESP_CONFIG1_SRRDISAB  0x40      /* Disable SCSI reset reports */
  44 #define ESP_CONFIG1_SLCABLE   0x80      /* Enable slow cable mode */
  45
  46 /* ESP config reg 2, read-write, found only on esp100a+esp200+esp236 chips */
  47 #define ESP_CONFIG2_DMAPARITY 0x01      /* enable DMA Parity (200,236) */
  48 #define ESP_CONFIG2_REGPARITY 0x02      /* enable reg Parity (200,236) */
  49 #define ESP_CONFIG2_BADPARITY 0x04      /* Bad parity target abort  */
  50 #define ESP_CONFIG2_SCSI2ENAB 0x08      /* Enable SCSI-2 features (tgtmode) */
  51 #define ESP_CONFIG2_HI        0x10      /* High Impedance DREQ ???  */
  52 #define ESP_CONFIG2_HMEFENAB  0x10      /* HME features enable */
  53 #define ESP_CONFIG2_BCM       0x20      /* Enable byte-ctrl (236)   */
  54 #define ESP_CONFIG2_DISPINT   0x20      /* Disable pause irq (hme) */
  55 #define ESP_CONFIG2_FENAB     0x40      /* Enable features (fas100,216) */
  56 #define ESP_CONFIG2_SPL       0x40      /* Enable status-phase latch (236) */
  57 #define ESP_CONFIG2_MKDONE    0x40      /* HME magic feature */
  58 #define ESP_CONFIG2_HME32     0x80      /* HME 32 extended */
  59 #define ESP_CONFIG2_MAGIC     0xe0      /* Invalid bits... */
  60
  61 /* ESP config register 3 read-write, found only esp236+fas236+fas100a+hme chips */
  62 #define ESP_CONFIG3_FCLOCK    0x01     /* FAST SCSI clock rate (esp100a/hme) */
  63 #define ESP_CONFIG3_TEM       0x01     /* Enable thresh-8 mode (esp/fas236)  */
  64 #define ESP_CONFIG3_FAST      0x02     /* Enable FAST SCSI     (esp100a/hme) */
  65 #define ESP_CONFIG3_ADMA      0x02     /* Enable alternate-dma (esp/fas236)  */
  66 #define ESP_CONFIG3_TENB      0x04     /* group2 SCSI2 support (esp100a/hme) */
  67 #define ESP_CONFIG3_SRB       0x04     /* Save residual byte   (esp/fas236)  */
  68 #define ESP_CONFIG3_TMS       0x08     /* Three-byte msg's ok  (esp100a/hme) */
  69 #define ESP_CONFIG3_FCLK      0x08     /* Fast SCSI clock rate (esp/fas236)  */
  70 #define ESP_CONFIG3_IDMSG     0x10     /* ID message checking  (esp100a/hme) */
  71 #define ESP_CONFIG3_FSCSI     0x10     /* Enable FAST SCSI     (esp/fas236)  */
  72 #define ESP_CONFIG3_GTM       0x20     /* group2 SCSI2 support (esp/fas236)  */
  73 #define ESP_CONFIG3_IDBIT3    0x20     /* Bit 3 of HME SCSI-ID (hme)         */
  74 #define ESP_CONFIG3_TBMS      0x40     /* Three-byte msg's ok  (esp/fas236)  */
  75 #define ESP_CONFIG3_EWIDE     0x40     /* Enable Wide-SCSI     (hme)         */
  76 #define ESP_CONFIG3_IMS       0x80     /* ID msg chk'ng        (esp/fas236)  */
  77 #define ESP_CONFIG3_OBPUSH    0x80     /* Push odd-byte to dma (hme)         */
  78
  79 /* ESP command register read-write */
  80 /* Group 1 commands:  These may be sent at any point in time to the ESP
  81  *                    chip.  None of them can generate interrupts 'cept
  82  *                    the "SCSI bus reset" command if you have not disabled
  83  *                    SCSI reset interrupts in the config1 ESP register.
  84  */
  85 #define ESP_CMD_NULL          0x00     /* Null command, ie. a nop */
  86 #define ESP_CMD_FLUSH         0x01     /* FIFO Flush */
  87 #define ESP_CMD_RC            0x02     /* Chip reset */
  88 #define ESP_CMD_RS            0x03     /* SCSI bus reset */
  89
  90 /* Group 2 commands:  ESP must be an initiator and connected to a target
  91  *                    for these commands to work.
  92  */
  93 #define ESP_CMD_TI            0x10     /* Transfer Information */
  94 #define ESP_CMD_ICCSEQ        0x11     /* Initiator cmd complete sequence */
  95 #define ESP_CMD_MOK           0x12     /* Message okie-dokie */
  96 #define ESP_CMD_TPAD          0x18     /* Transfer Pad */
  97 #define ESP_CMD_SATN          0x1a     /* Set ATN */
  98 #define ESP_CMD_RATN          0x1b     /* De-assert ATN */
  99
 100 /* Group 3 commands:  ESP must be in the MSGOUT or MSGIN state and be connected
 101  *                    to a target as the initiator for these commands to work.
 102  */
 103 #define ESP_CMD_SMSG          0x20     /* Send message */
 104 #define ESP_CMD_SSTAT         0x21     /* Send status */
 105 #define ESP_CMD_SDATA         0x22     /* Send data */
 106 #define ESP_CMD_DSEQ          0x23     /* Discontinue Sequence */
 107 #define ESP_CMD_TSEQ          0x24     /* Terminate Sequence */
 108 #define ESP_CMD_TCCSEQ        0x25     /* Target cmd cmplt sequence */
 109 #define ESP_CMD_DCNCT         0x27     /* Disconnect */
 110 #define ESP_CMD_RMSG          0x28     /* Receive Message */
 111 #define ESP_CMD_RCMD          0x29     /* Receive Command */
 112 #define ESP_CMD_RDATA         0x2a     /* Receive Data */
 113 #define ESP_CMD_RCSEQ         0x2b     /* Receive cmd sequence */
 114
 115 /* Group 4 commands:  The ESP must be in the disconnected state and must
 116  *                    not be connected to any targets as initiator for
 117  *                    these commands to work.
 118  */
 119 #define ESP_CMD_RSEL          0x40     /* Reselect */
 120 #define ESP_CMD_SEL           0x41     /* Select w/o ATN */
 121 #define ESP_CMD_SELA          0x42     /* Select w/ATN */
 122 #define ESP_CMD_SELAS         0x43     /* Select w/ATN & STOP */
 123 #define ESP_CMD_ESEL          0x44     /* Enable selection */
 124 #define ESP_CMD_DSEL          0x45     /* Disable selections */
 125 #define ESP_CMD_SA3           0x46     /* Select w/ATN3 */
 126 #define ESP_CMD_RSEL3         0x47     /* Reselect3 */
 127
 128 /* This bit enables the ESP's DMA on the SBus */
 129 #define ESP_CMD_DMA           0x80     /* Do DMA? */
 130
 131 /* ESP status register read-only */
 132 #define ESP_STAT_PIO          0x01     /* IO phase bit */
 133 #define ESP_STAT_PCD          0x02     /* CD phase bit */
 134 #define ESP_STAT_PMSG         0x04     /* MSG phase bit */
 135 #define ESP_STAT_PMASK        0x07     /* Mask of phase bits */
 136 #define ESP_STAT_TDONE        0x08     /* Transfer Completed */
 137 #define ESP_STAT_TCNT         0x10     /* Transfer Counter Is Zero */
 138 #define ESP_STAT_PERR         0x20     /* Parity error */
 139 #define ESP_STAT_SPAM         0x40     /* Real bad error */
 140 /* This indicates the 'interrupt pending' condition on esp236, it is a reserved
 141  * bit on other revs of the ESP.
 142  */
 143 #define ESP_STAT_INTR         0x80             /* Interrupt */
 144
 145 /* The status register can be masked with ESP_STAT_PMASK and compared
 146  * with the following values to determine the current phase the ESP
 147  * (at least thinks it) is in.  For our purposes we also add our own
 148  * software 'done' bit for our phase management engine.
 149  */
 150 #define ESP_DOP   (0)                                       /* Data Out  */
 151 #define ESP_DIP   (ESP_STAT_PIO)                            /* Data In   */
 152 #define ESP_CMDP  (ESP_STAT_PCD)                            /* Command   */
 153 #define ESP_STATP (ESP_STAT_PCD|ESP_STAT_PIO)               /* Status    */
 154 #define ESP_MOP   (ESP_STAT_PMSG|ESP_STAT_PCD)              /* Message Out */
 155 #define ESP_MIP   (ESP_STAT_PMSG|ESP_STAT_PCD|ESP_STAT_PIO) /* Message In */
 156
 157 /* HME only: status 2 register */
 158 #define ESP_STAT2_SCHBIT      0x01 /* Upper bits 3-7 of sstep enabled */
 159 #define ESP_STAT2_FFLAGS      0x02 /* The fifo flags are now latched */
 160 #define ESP_STAT2_XCNT        0x04 /* The transfer counter is latched */
 161 #define ESP_STAT2_CREGA       0x08 /* The command reg is active now */
 162 #define ESP_STAT2_WIDE        0x10 /* Interface on this adapter is wide */
 163 #define ESP_STAT2_F1BYTE      0x20 /* There is one byte at top of fifo */
 164 #define ESP_STAT2_FMSB        0x40 /* Next byte in fifo is most significant */
 165 #define ESP_STAT2_FEMPTY      0x80 /* FIFO is empty */
 166
 167 /* ESP interrupt register read-only */
 168 #define ESP_INTR_S            0x01     /* Select w/o ATN */
 169 #define ESP_INTR_SATN         0x02     /* Select w/ATN */
 170 #define ESP_INTR_RSEL         0x04     /* Reselected */
 171 #define ESP_INTR_FDONE        0x08     /* Function done */
 172 #define ESP_INTR_BSERV        0x10     /* Bus service */
 173 #define ESP_INTR_DC           0x20     /* Disconnect */
 174 #define ESP_INTR_IC           0x40     /* Illegal command given */
 175 #define ESP_INTR_SR           0x80     /* SCSI bus reset detected */
 176
 177 /* ESP sequence step register read-only */
 178 #define ESP_STEP_VBITS        0x07     /* Valid bits */
 179 #define ESP_STEP_ASEL         0x00     /* Selection&Arbitrate cmplt */
 180 #define ESP_STEP_SID          0x01     /* One msg byte sent */
 181 #define ESP_STEP_NCMD         0x02     /* Was not in command phase */
 182 #define ESP_STEP_PPC          0x03     /* Early phase chg caused cmnd
 183                                         * bytes to be lost
 184                                         */
 185 #define ESP_STEP_FINI4        0x04     /* Command was sent ok */
 186
 187 /* Ho hum, some ESP's set the step register to this as well... */
 188 #define ESP_STEP_FINI5        0x05
 189 #define ESP_STEP_FINI6        0x06
 190 #define ESP_STEP_FINI7        0x07
 191
 192 /* ESP chip-test register read-write */
 193 #define ESP_TEST_TARG         0x01     /* Target test mode */
 194 #define ESP_TEST_INI          0x02     /* Initiator test mode */
 195 #define ESP_TEST_TS           0x04     /* Tristate test mode */
 196
 197 /* ESP unique ID register read-only, found on fas236+fas100a only */
 198 #define ESP_UID_F100A         0x00     /* ESP FAS100A  */
 199 #define ESP_UID_F236          0x02     /* ESP FAS236   */
 200 #define ESP_UID_REV           0x07     /* ESP revision */
 201 #define ESP_UID_FAM           0xf8     /* ESP family   */
 202
 203 /* ESP fifo flags register read-only */
 204 /* Note that the following implies a 16 byte FIFO on the ESP. */
 205 #define ESP_FF_FBYTES         0x1f     /* Num bytes in FIFO */
 206 #define ESP_FF_ONOTZERO       0x20     /* offset ctr not zero (esp100) */
 207 #define ESP_FF_SSTEP          0xe0     /* Sequence step */
 208
 209 /* ESP clock conversion factor register write-only */
 210 #define ESP_CCF_F0            0x00     /* 35.01MHz - 40MHz */
 211 #define ESP_CCF_NEVER         0x01     /* Set it to this and die */
 212 #define ESP_CCF_F2            0x02     /* 10MHz */
 213 #define ESP_CCF_F3            0x03     /* 10.01MHz - 15MHz */
 214 #define ESP_CCF_F4            0x04     /* 15.01MHz - 20MHz */
 215 #define ESP_CCF_F5            0x05     /* 20.01MHz - 25MHz */
 216 #define ESP_CCF_F6            0x06     /* 25.01MHz - 30MHz */
 217 #define ESP_CCF_F7            0x07     /* 30.01MHz - 35MHz */
 218
 219 /* HME only... */
 220 #define ESP_BUSID_RESELID     0x10
 221 #define ESP_BUSID_CTR32BIT    0x40
 222
 223 #define ESP_BUS_TIMEOUT        250     /* In milli-seconds */
 224 #define ESP_TIMEO_CONST       8192
 225 #define ESP_NEG_DEFP(mhz, cfact) \
 226         ((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact)))
 227 #define ESP_HZ_TO_CYCLE(hertz)  ((1000000000) / ((hertz) / 1000))
 228 #define ESP_TICK(ccf, cycle)  ((7682 * (ccf) * (cycle) / 1000))
 229
 230 /* For slow to medium speed input clock rates we shoot for 5mb/s, but for high
 231  * input clock rates we try to do 10mb/s although I don't think a transfer can
 232  * even run that fast with an ESP even with DMA2 scatter gather pipelining.
 233  */
 234 #define SYNC_DEFP_SLOW            0x32   /* 5mb/s  */
 235 #define SYNC_DEFP_FAST            0x19   /* 10mb/s */
 236
 237 struct esp_cmd_priv {
 238         union {
 239                 dma_addr_t      dma_addr;
 240                 int             num_sg;
 241         } u;
 242
 243         int                     cur_residue;
 244         struct scatterlist      *cur_sg;
 245         int                     tot_residue;
 246 };
 247 #define ESP_CMD_PRIV(CMD)       ((struct esp_cmd_priv *)(&(CMD)->SCp))
 248
 249 enum esp_rev {
 250         ESP100     = 0x00,  /* NCR53C90 - very broken */
 251         ESP100A    = 0x01,  /* NCR53C90A */
 252         ESP236     = 0x02,
 253         FAS236     = 0x03,
 254         FAS100A    = 0x04,
 255         FAST       = 0x05,
 256         FASHME     = 0x06,
 257 };
 258
 259 struct esp_cmd_entry {
 260         struct list_head        list;
 261
 262         struct scsi_cmnd        *cmd;
 263
 264         unsigned int            saved_cur_residue;
 265         struct scatterlist      *saved_cur_sg;
 266         unsigned int            saved_tot_residue;
 267
 268         u8                      flags;
 269 #define ESP_CMD_FLAG_WRITE      0x01 /* DMA is a write */
 270 #define ESP_CMD_FLAG_ABORT      0x02 /* being aborted */
 271 #define ESP_CMD_FLAG_AUTOSENSE  0x04 /* Doing automatic REQUEST_SENSE */
 272
 273         u8                      tag[2];
 274
 275         u8                      status;
 276         u8                      message;
 277
 278         unsigned char           *sense_ptr;
 279         unsigned char           *saved_sense_ptr;
 280         dma_addr_t              sense_dma;
 281
 282         struct completion       *eh_done;
 283 };
 284
 285 /* XXX make this configurable somehow XXX */
 286 #define ESP_DEFAULT_TAGS        16
 287
 288 #define ESP_MAX_TARGET          16
 289 #define ESP_MAX_LUN             8
 290 #define ESP_MAX_TAG             256
 291
 292 struct esp_lun_data {
 293         struct esp_cmd_entry    *non_tagged_cmd;
 294         int                     num_tagged;
 295         int                     hold;
 296         struct esp_cmd_entry    *tagged_cmds[ESP_MAX_TAG];
 297 };
 298
 299 struct esp_target_data {
 300         /* These are the ESP_STP, ESP_SOFF, and ESP_CFG3 register values which
 301          * match the currently negotiated settings for this target.  The SCSI
 302          * protocol values are maintained in spi_{offset,period,wide}(starget).
 303          */
 304         u8                      esp_period;
 305         u8                      esp_offset;
 306         u8                      esp_config3;
 307
 308         u8                      flags;
 309 #define ESP_TGT_WIDE            0x01
 310 #define ESP_TGT_DISCONNECT      0x02
 311 #define ESP_TGT_NEGO_WIDE       0x04
 312 #define ESP_TGT_NEGO_SYNC       0x08
 313 #define ESP_TGT_CHECK_NEGO      0x40
 314 #define ESP_TGT_BROKEN          0x80
 315
 316         /* When ESP_TGT_CHECK_NEGO is set, on the next scsi command to this
 317          * device we will try to negotiate the following parameters.
 318          */
 319         u8                      nego_goal_period;
 320         u8                      nego_goal_offset;
 321         u8                      nego_goal_width;
 322         u8                      nego_goal_tags;
 323
 324         struct scsi_target      *starget;
 325 };
 326
 327 struct esp_event_ent {
 328         u8                      type;
 329 #define ESP_EVENT_TYPE_EVENT    0x01
 330 #define ESP_EVENT_TYPE_CMD      0x02
 331         u8                      val;
 332
 333         u8                      sreg;
 334         u8                      seqreg;
 335         u8                      sreg2;
 336         u8                      ireg;
 337         u8                      select_state;
 338         u8                      event;
 339         u8                      __pad;
 340 };
 341
 342 struct esp;
 343 struct esp_driver_ops {
 344         /* Read and write the ESP 8-bit registers.  On some
 345          * applications of the ESP chip the registers are at 4-byte
 346          * instead of 1-byte intervals.
 347          */
 348         void (*esp_write8)(struct esp *esp, u8 val, unsigned long reg);
 349         u8 (*esp_read8)(struct esp *esp, unsigned long reg);
 350
 351         /* Map and unmap DMA memory.  Eventually the driver will be
 352          * converted to the generic DMA API as soon as SBUS is able to
 353          * cope with that.  At such time we can remove this.
 354          */
 355         dma_addr_t (*map_single)(struct esp *esp, void *buf,
 356                                  size_t sz, int dir);
 357         int (*map_sg)(struct esp *esp, struct scatterlist *sg,
 358                       int num_sg, int dir);
 359         void (*unmap_single)(struct esp *esp, dma_addr_t addr,
 360                              size_t sz, int dir);
 361         void (*unmap_sg)(struct esp *esp, struct scatterlist *sg,
 362                          int num_sg, int dir);
 363
 364         /* Return non-zero if there is an IRQ pending.  Usually this
 365          * status bit lives in the DMA controller sitting in front of
 366          * the ESP.  This has to be accurate or else the ESP interrupt
 367          * handler will not run.
 368          */
 369         int (*irq_pending)(struct esp *esp);
 370
 371         /* Return the maximum allowable size of a DMA transfer for a
 372          * given buffer.
 373          */
 374         u32 (*dma_length_limit)(struct esp *esp, u32 dma_addr,
 375                                 u32 dma_len);
 376
 377         /* Reset the DMA engine entirely.  On return, ESP interrupts
 378          * should be enabled.  Often the interrupt enabling is
 379          * controlled in the DMA engine.
 380          */
 381         void (*reset_dma)(struct esp *esp);
 382
 383         /* Drain any pending DMA in the DMA engine after a transfer.
 384          * This is for writes to memory.
 385          */
 386         void (*dma_drain)(struct esp *esp);
 387
 388         /* Invalidate the DMA engine after a DMA transfer.  */
 389         void (*dma_invalidate)(struct esp *esp);
 390
 391         /* Setup an ESP command that will use a DMA transfer.
 392          * The 'esp_count' specifies what transfer length should be
 393          * programmed into the ESP transfer counter registers, whereas
 394          * the 'dma_count' is the length that should be programmed into
 395          * the DMA controller.  Usually they are the same.  If 'write'
 396          * is non-zero, this transfer is a write into memory.  'cmd'
 397          * holds the ESP command that should be issued by calling
 398          * scsi_esp_cmd() at the appropriate time while programming
 399          * the DMA hardware.
 400          */
 401         void (*send_dma_cmd)(struct esp *esp, u32 dma_addr, u32 esp_count,
 402                              u32 dma_count, int write, u8 cmd);
 403
 404         /* Return non-zero if the DMA engine is reporting an error
 405          * currently.
 406          */
 407         int (*dma_error)(struct esp *esp);
 408 };
 409
 410 #define ESP_MAX_MSG_SZ          8
 411 #define ESP_EVENT_LOG_SZ        32
 412
 413 #define ESP_QUICKIRQ_LIMIT      100
 414 #define ESP_RESELECT_TAG_LIMIT  2500
 415
 416 struct esp {
 417         void __iomem            *regs;
 418         void __iomem            *dma_regs;
 419
 420         const struct esp_driver_ops *ops;
 421
 422         struct Scsi_Host        *host;
 423         void                    *dev;
 424
 425         struct esp_cmd_entry    *active_cmd;
 426
 427         struct list_head        queued_cmds;
 428         struct list_head        active_cmds;
 429
 430         u8                      *command_block;
 431         dma_addr_t              command_block_dma;
 432
 433         unsigned int            data_dma_len;
 434
 435         /* The following are used to determine the cause of an IRQ. Upon every
 436          * IRQ entry we synchronize these with the hardware registers.
 437          */
 438         u8                      sreg;
 439         u8                      seqreg;
 440         u8                      sreg2;
 441         u8                      ireg;
 442
 443         u32                     prev_hme_dmacsr;
 444         u8                      prev_soff;
 445         u8                      prev_stp;
 446         u8                      prev_cfg3;
 447         u8                      __pad;
 448
 449         struct list_head        esp_cmd_pool;
 450
 451         struct esp_target_data  target[ESP_MAX_TARGET];
 452
 453         int                     fifo_cnt;
 454         u8                      fifo[16];
 455
 456         struct esp_event_ent    esp_event_log[ESP_EVENT_LOG_SZ];
 457         int                     esp_event_cur;
 458
 459         u8                      msg_out[ESP_MAX_MSG_SZ];
 460         int                     msg_out_len;
 461
 462         u8                      msg_in[ESP_MAX_MSG_SZ];
 463         int                     msg_in_len;
 464
 465         u8                      bursts;
 466         u8                      config1;
 467         u8                      config2;
 468
 469         u8                      scsi_id;
 470         u32                     scsi_id_mask;
 471
 472         enum esp_rev            rev;
 473
 474         u32                     flags;
 475 #define ESP_FLAG_DIFFERENTIAL   0x00000001
 476 #define ESP_FLAG_RESETTING      0x00000002
 477 #define ESP_FLAG_DOING_SLOWCMD  0x00000004
 478 #define ESP_FLAG_WIDE_CAPABLE   0x00000008
 479 #define ESP_FLAG_QUICKIRQ_CHECK 0x00000010
 480 #define ESP_FLAG_DISABLE_SYNC   0x00000020
 481
 482         u8                      select_state;
 483 #define ESP_SELECT_NONE         0x00 /* Not selecting */
 484 #define ESP_SELECT_BASIC        0x01 /* Select w/o MSGOUT phase */
 485 #define ESP_SELECT_MSGOUT       0x02 /* Select with MSGOUT */
 486
 487         /* When we are not selecting, we are expecting an event.  */
 488         u8                      event;
 489 #define ESP_EVENT_NONE          0x00
 490 #define ESP_EVENT_CMD_START     0x01
 491 #define ESP_EVENT_CMD_DONE      0x02
 492 #define ESP_EVENT_DATA_IN       0x03
 493 #define ESP_EVENT_DATA_OUT      0x04
 494 #define ESP_EVENT_DATA_DONE     0x05
 495 #define ESP_EVENT_MSGIN         0x06
 496 #define ESP_EVENT_MSGIN_MORE    0x07
 497 #define ESP_EVENT_MSGIN_DONE    0x08
 498 #define ESP_EVENT_MSGOUT        0x09
 499 #define ESP_EVENT_MSGOUT_DONE   0x0a
 500 #define ESP_EVENT_STATUS        0x0b
 501 #define ESP_EVENT_FREE_BUS      0x0c
 502 #define ESP_EVENT_CHECK_PHASE   0x0d
 503 #define ESP_EVENT_RESET         0x10
 504
 505         /* Probed in esp_get_clock_params() */
 506         u32                     cfact;
 507         u32                     cfreq;
 508         u32                     ccycle;
 509         u32                     ctick;
 510         u32                     neg_defp;
 511         u32                     sync_defp;
 512
 513         /* Computed in esp_reset_esp() */
 514         u32                     max_period;
 515         u32                     min_period;
 516         u32                     radelay;
 517
 518         /* Slow command state.  */
 519         u8                      *cmd_bytes_ptr;
 520         int                     cmd_bytes_left;
 521
 522         struct completion       *eh_reset;
 523
 524         void                    *dma;
 525         int                     dmarev;
 526 };
 527
 528 /* A front-end driver for the ESP chip should do the following in
 529  * it's device probe routine:
 530  * 1) Allocate the host and private area using scsi_host_alloc()
 531  *    with size 'sizeof(struct esp)'.  The first argument to
 532  *    scsi_host_alloc() should be &scsi_esp_template.
 533  * 2) Set host->max_id as appropriate.
 534  * 3) Set esp->host to the scsi_host itself, and esp->dev
 535  *    to the device object pointer.
 536  * 4) Hook up esp->ops to the front-end implementation.
 537  * 5) If the ESP chip supports wide transfers, set ESP_FLAG_WIDE_CAPABLE
 538  *    in esp->flags.
 539  * 6) Map the DMA and ESP chip registers.
 540  * 7) DMA map the ESP command block, store the DMA address
 541  *    in esp->command_block_dma.
 542  * 8) Register the scsi_esp_intr() interrupt handler.
 543  * 9) Probe for and provide the following chip properties:
 544  *    esp->scsi_id (assign to esp->host->this_id too)
 545  *    esp->scsi_id_mask
 546  *    If ESP bus is differential, set ESP_FLAG_DIFFERENTIAL
 547  *    esp->cfreq
 548  *    DMA burst bit mask in esp->bursts, if necessary
 549  * 10) Perform any actions necessary before the ESP device can
 550  *     be programmed for the first time.  On some configs, for
 551  *     example, the DMA engine has to be reset before ESP can
 552  *     be programmed.
 553  * 11) If necessary, call dev_set_drvdata() as needed.
 554  * 12) Call scsi_esp_register() with prepared 'esp' structure
 555  *     and a device pointer if possible.
 556  * 13) Check scsi_esp_register() return value, release all resources
 557  *     if an error was returned.
 558  */
 559 extern struct scsi_host_template scsi_esp_template;
 560 extern int scsi_esp_register(struct esp *, struct device *);
 561
 562 extern void scsi_esp_unregister(struct esp *);
 563 extern irqreturn_t scsi_esp_intr(int, void *);
 564 extern void scsi_esp_cmd(struct esp *, u8);
 565
 566 #endif /* !(_ESP_SCSI_H) */