drivers/scsi/arm/fas216.h

   1 /*
   2  *  linux/drivers/acorn/scsi/fas216.h
   3  *
   4  *  Copyright (C) 1997-2000 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  FAS216 generic driver
  11  */
  12 #ifndef FAS216_H
  13 #define FAS216_H
  14
  15 #ifndef NO_IRQ
  16 #define NO_IRQ 255
  17 #endif
  18
  19 #include "queue.h"
  20 #include "msgqueue.h"
  21
  22 /* FAS register definitions */
  23
  24 /* transfer count low */
  25 #define REG_CTCL                (0)
  26 #define REG_STCL                (0)
  27
  28 /* transfer count medium */
  29 #define REG_CTCM                (1)
  30 #define REG_STCM                (1)
  31
  32 /* fifo data */
  33 #define REG_FF                  (2)
  34
  35 /* command */
  36 #define REG_CMD                 (3)
  37 #define CMD_NOP                 0x00
  38 #define CMD_FLUSHFIFO           0x01
  39 #define CMD_RESETCHIP           0x02
  40 #define CMD_RESETSCSI           0x03
  41
  42 #define CMD_TRANSFERINFO        0x10
  43 #define CMD_INITCMDCOMPLETE     0x11
  44 #define CMD_MSGACCEPTED         0x12
  45 #define CMD_PADBYTES            0x18
  46 #define CMD_SETATN              0x1a
  47 #define CMD_RSETATN             0x1b
  48
  49 #define CMD_SELECTWOATN         0x41
  50 #define CMD_SELECTATN           0x42
  51 #define CMD_SELECTATNSTOP       0x43
  52 #define CMD_ENABLESEL           0x44
  53 #define CMD_DISABLESEL          0x45
  54 #define CMD_SELECTATN3          0x46
  55 #define CMD_RESEL3              0x47
  56
  57 #define CMD_WITHDMA             0x80
  58
  59 /* status register (read) */
  60 #define REG_STAT                (4)
  61 #define STAT_IO                 (1 << 0)                        /* IO phase             */
  62 #define STAT_CD                 (1 << 1)                        /* CD phase             */
  63 #define STAT_MSG                (1 << 2)                        /* MSG phase            */
  64 #define STAT_TRANSFERDONE       (1 << 3)                        /* Transfer completed   */
  65 #define STAT_TRANSFERCNTZ       (1 << 4)                        /* Transfer counter is zero */
  66 #define STAT_PARITYERROR        (1 << 5)                        /* Parity error         */
  67 #define STAT_REALBAD            (1 << 6)                        /* Something bad        */
  68 #define STAT_INT                (1 << 7)                        /* Interrupt            */
  69
  70 #define STAT_BUSMASK            (STAT_MSG|STAT_CD|STAT_IO)
  71 #define STAT_DATAOUT            (0)                             /* Data out             */
  72 #define STAT_DATAIN             (STAT_IO)                       /* Data in              */
  73 #define STAT_COMMAND            (STAT_CD)                       /* Command out          */
  74 #define STAT_STATUS             (STAT_CD|STAT_IO)               /* Status In            */
  75 #define STAT_MESGOUT            (STAT_MSG|STAT_CD)              /* Message out          */
  76 #define STAT_MESGIN             (STAT_MSG|STAT_CD|STAT_IO)      /* Message In           */
  77
  78 /* bus ID for select / reselect */
  79 #define REG_SDID                (4)
  80 #define BUSID(target)           ((target) & 7)
  81
  82 /* Interrupt status register (read) */
  83 #define REG_INST                (5)
  84 #define INST_SELWOATN           (1 << 0)                        /* Select w/o ATN       */
  85 #define INST_SELATN             (1 << 1)                        /* Select w/ATN         */
  86 #define INST_RESELECTED         (1 << 2)                        /* Reselected           */
  87 #define INST_FUNCDONE           (1 << 3)                        /* Function done        */
  88 #define INST_BUSSERVICE         (1 << 4)                        /* Bus service          */
  89 #define INST_DISCONNECT         (1 << 5)                        /* Disconnect           */
  90 #define INST_ILLEGALCMD         (1 << 6)                        /* Illegal command      */
  91 #define INST_BUSRESET           (1 << 7)                        /* SCSI Bus reset       */
  92
  93 /* Timeout register (write) */
  94 #define REG_STIM                (5)
  95
  96 /* Sequence step register (read) */
  97 #define REG_IS                  (6)
  98 #define IS_BITS                 0x07
  99 #define IS_SELARB               0x00                            /* Select & Arb ok      */
 100 #define IS_MSGBYTESENT          0x01                            /* One byte message sent*/
 101 #define IS_NOTCOMMAND           0x02                            /* Not in command state */
 102 #define IS_EARLYPHASE           0x03                            /* Early phase change   */
 103 #define IS_COMPLETE             0x04                            /* Command ok           */
 104 #define IS_SOF                  0x08                            /* Sync off flag        */
 105
 106 /* Transfer period step (write) */
 107 #define REG_STP                 (6)
 108
 109 /* Synchronous Offset (write) */
 110 #define REG_SOF                 (7)
 111
 112 /* Fifo state register (read) */
 113 #define REG_CFIS                (7)
 114 #define CFIS_CF                 0x1f                            /* Num bytes in FIFO    */
 115 #define CFIS_IS                 0xe0                            /* Step                 */
 116
 117 /* config register 1 */
 118 #define REG_CNTL1               (8)
 119 #define CNTL1_CID               (7 << 0)                        /* Chip ID                      */
 120 #define CNTL1_STE               (1 << 3)                        /* Self test enable             */
 121 #define CNTL1_PERE              (1 << 4)                        /* Parity enable reporting en.  */
 122 #define CNTL1_PTE               (1 << 5)                        /* Parity test enable           */
 123 #define CNTL1_DISR              (1 << 6)                        /* Disable Irq on SCSI reset    */
 124 #define CNTL1_ETM               (1 << 7)                        /* Extended Timing Mode         */
 125
 126 /* Clock conversion factor (read) */
 127 #define REG_CLKF                (9)
 128 #define CLKF_F37MHZ             0x00                            /* 35.01 - 40 MHz               */
 129 #define CLKF_F10MHZ             0x02                            /* 10 MHz                       */
 130 #define CLKF_F12MHZ             0x03                            /* 10.01 - 15 MHz               */
 131 #define CLKF_F17MHZ             0x04                            /* 15.01 - 20 MHz               */
 132 #define CLKF_F22MHZ             0x05                            /* 20.01 - 25 MHz               */
 133 #define CLKF_F27MHZ             0x06                            /* 25.01 - 30 MHz               */
 134 #define CLKF_F32MHZ             0x07                            /* 30.01 - 35 MHz               */
 135
 136 /* Chip test register (write) */
 137 #define REG_FTM                 (10)
 138 #define TEST_FTM                0x01                            /* Force target mode            */
 139 #define TEST_FIM                0x02                            /* Force initiator mode         */
 140 #define TEST_FHI                0x04                            /* Force high impedance mode    */
 141
 142 /* Configuration register 2 (read/write) */
 143 #define REG_CNTL2               (11)
 144 #define CNTL2_PGDP              (1 << 0)                        /* Pass Th/Generate Data Parity */
 145 #define CNTL2_PGRP              (1 << 1)                        /* Pass Th/Generate Reg Parity  */
 146 #define CNTL2_ACDPE             (1 << 2)                        /* Abort on Cmd/Data Parity Err */
 147 #define CNTL2_S2FE              (1 << 3)                        /* SCSI2 Features Enable        */
 148 #define CNTL2_TSDR              (1 << 4)                        /* Tristate DREQ                */
 149 #define CNTL2_SBO               (1 << 5)                        /* Select Byte Order            */
 150 #define CNTL2_ENF               (1 << 6)                        /* Enable features              */
 151 #define CNTL2_DAE               (1 << 7)                        /* Data Alignment Enable        */
 152
 153 /* Configuration register 3 (read/write) */
 154 #define REG_CNTL3               (12)
 155 #define CNTL3_BS8               (1 << 0)                        /* Burst size 8                 */
 156 #define CNTL3_MDM               (1 << 1)                        /* Modify DMA mode              */
 157 #define CNTL3_LBTM              (1 << 2)                        /* Last Byte Transfer mode      */
 158 #define CNTL3_FASTCLK           (1 << 3)                        /* Fast SCSI clocking           */
 159 #define CNTL3_FASTSCSI          (1 << 4)                        /* Fast SCSI                    */
 160 #define CNTL3_G2CB              (1 << 5)                        /* Group2 SCSI support          */
 161 #define CNTL3_QTAG              (1 << 6)                        /* Enable 3 byte msgs           */
 162 #define CNTL3_ADIDCHK           (1 << 7)                        /* Additional ID check          */
 163
 164 /* High transfer count (read/write) */
 165 #define REG_CTCH                (14)
 166 #define REG_STCH                (14)
 167
 168 /* ID register (read only) */
 169 #define REG_ID                  (14)
 170
 171 /* Data alignment */
 172 #define REG_DAL                 (15)
 173
 174 typedef enum {
 175         PHASE_IDLE,                                     /* we're not planning on doing anything */
 176         PHASE_SELECTION,                                /* selecting a device                   */
 177         PHASE_SELSTEPS,                                 /* selection with command steps         */
 178         PHASE_COMMAND,                                  /* command sent                         */
 179         PHASE_MESSAGESENT,                              /* selected, and we're sending cmd      */
 180         PHASE_DATAOUT,                                  /* data out to device                   */
 181         PHASE_DATAIN,                                   /* data in from device                  */
 182         PHASE_MSGIN,                                    /* message in from device               */
 183         PHASE_MSGIN_DISCONNECT,                         /* disconnecting from bus               */
 184         PHASE_MSGOUT,                                   /* after message out phase              */
 185         PHASE_MSGOUT_EXPECT,                            /* expecting message out                */
 186         PHASE_STATUS,                                   /* status from device                   */
 187         PHASE_DONE                                      /* Command complete                     */
 188 } phase_t;
 189
 190 typedef enum {
 191         DMA_OUT,                                        /* DMA from memory to chip              */
 192         DMA_IN                                          /* DMA from chip to memory              */
 193 } fasdmadir_t;
 194
 195 typedef enum {
 196         fasdma_none,                                    /* No dma                               */
 197         fasdma_pio,                                     /* PIO mode                             */
 198         fasdma_pseudo,                                  /* Pseudo DMA                           */
 199         fasdma_real_block,                              /* Real DMA, on block by block basis    */
 200         fasdma_real_all                                 /* Real DMA, on request by request      */
 201 } fasdmatype_t;
 202
 203 typedef enum {
 204         neg_wait,                                       /* Negociate with device                */
 205         neg_inprogress,                                 /* Negociation sent                     */
 206         neg_complete,                                   /* Negociation complete                 */
 207         neg_targcomplete,                               /* Target completed negociation         */
 208         neg_invalid                                     /* Negociation not supported            */
 209 } neg_t;
 210
 211 #define MAGIC   0x441296bdUL
 212 #define NR_MSGS 8
 213
 214 #define FASCAP_DMA              (1 << 0)
 215 #define FASCAP_PSEUDODMA        (1 << 1)
 216
 217 typedef struct {
 218         unsigned long           magic_start;
 219         spinlock_t              host_lock;
 220         struct Scsi_Host        *host;                  /* host                                 */
 221         Scsi_Cmnd               *SCpnt;                 /* currently processing command         */
 222         Scsi_Cmnd               *origSCpnt;             /* original connecting command          */
 223         Scsi_Cmnd               *reqSCpnt;              /* request sense command                */
 224         Scsi_Cmnd               *rstSCpnt;              /* reset command                        */
 225         Scsi_Cmnd               *pending_SCpnt[8];      /* per-device pending commands          */
 226         int                     next_pending;           /* next pending device                  */
 227
 228         /*
 229          * Error recovery
 230          */
 231         wait_queue_head_t       eh_wait;
 232         struct timer_list       eh_timer;
 233         unsigned int            rst_dev_status;
 234         unsigned int            rst_bus_status;
 235
 236         /* driver information */
 237         struct {
 238                 phase_t         phase;                  /* current phase                        */
 239                 void __iomem    *io_base;               /* iomem base of FAS216                 */
 240                 unsigned int    io_shift;               /* shift to adjust reg offsets by       */
 241                 unsigned char   cfg[4];                 /* configuration registers              */
 242                 const char      *type;                  /* chip type                            */
 243                 unsigned int    irq;                    /* interrupt                            */
 244                 int             dma;                    /* dma channel                          */
 245
 246                 Scsi_Pointer    SCp;                    /* current commands data pointer        */
 247
 248                 MsgQueue_t      msgs;                   /* message queue for connected device   */
 249
 250                 unsigned int    async_stp;              /* Async transfer STP value             */
 251                 unsigned char   msgin_fifo;             /* bytes in fifo at time of message in  */
 252                 unsigned char   message[256];           /* last message received from device    */
 253
 254                 unsigned char   disconnectable:1;       /* this command can be disconnected     */
 255                 unsigned char   aborting:1;             /* aborting command                     */
 256         } scsi;
 257
 258         /* statistics information */
 259         struct {
 260                 unsigned int    queues;
 261                 unsigned int    removes;
 262                 unsigned int    fins;
 263                 unsigned int    reads;
 264                 unsigned int    writes;
 265                 unsigned int    miscs;
 266                 unsigned int    disconnects;
 267                 unsigned int    aborts;
 268                 unsigned int    bus_resets;
 269                 unsigned int    host_resets;
 270         } stats;
 271
 272         /* configuration information */
 273         struct {
 274                 unsigned char   clockrate;              /* clock rate of FAS device (MHz)       */
 275                 unsigned char   select_timeout;         /* timeout (R5)                         */
 276                 unsigned char   sync_max_depth;         /* Synchronous xfer max fifo depth      */
 277                 unsigned char   wide_max_size;          /* Maximum wide transfer size           */
 278                 unsigned char   cntl3;                  /* Control Reg 3                        */
 279                 unsigned int    asyncperiod;            /* Async transfer period (ns)           */
 280                 unsigned int    capabilities;           /* driver capabilities                  */
 281                 unsigned int    disconnect_ok:1;        /* Disconnects allowed?                 */
 282         } ifcfg;
 283
 284         /* queue handling */
 285         struct {
 286                 Queue_t         issue;                  /* issue queue                          */
 287                 Queue_t         disconnected;           /* disconnected command queue           */
 288         } queues;
 289
 290         /* per-device info */
 291         struct fas216_device {
 292                 unsigned char   disconnect_ok:1;        /* device can disconnect                */
 293                 unsigned char   parity_enabled:1;       /* parity checking enabled              */
 294                 unsigned char   parity_check:1;         /* need to check parity checking        */
 295                 unsigned char   period;                 /* sync xfer period in (*4ns)           */
 296                 unsigned char   stp;                    /* synchronous transfer period          */
 297                 unsigned char   sof;                    /* synchronous offset register          */
 298                 unsigned char   wide_xfer;              /* currently negociated wide transfer   */
 299                 neg_t           sync_state;             /* synchronous transfer mode            */
 300                 neg_t           wide_state;             /* wide transfer mode                   */
 301         } device[8];
 302         unsigned long   busyluns[64/sizeof(unsigned long)];/* array of bits indicating LUNs busy        */
 303
 304         /* dma */
 305         struct {
 306                 fasdmatype_t    transfer_type;          /* current type of DMA transfer         */
 307                 fasdmatype_t    (*setup) (struct Scsi_Host *host, Scsi_Pointer *SCp, fasdmadir_t direction, fasdmatype_t min_dma);
 308                 void            (*pseudo)(struct Scsi_Host *host, Scsi_Pointer *SCp, fasdmadir_t direction, int transfer);
 309                 void            (*stop)  (struct Scsi_Host *host, Scsi_Pointer *SCp);
 310         } dma;
 311
 312         /* miscellaneous */
 313         int                     internal_done;          /* flag to indicate request done */
 314         unsigned long           magic_end;
 315 } FAS216_Info;
 316
 317 /* Function: int fas216_init (struct Scsi_Host *instance)
 318  * Purpose : initialise FAS/NCR/AMD SCSI structures.
 319  * Params  : instance - a driver-specific filled-out structure
 320  * Returns : 0 on success
 321  */
 322 extern int fas216_init (struct Scsi_Host *instance);
 323
 324 /* Function: int fas216_add (struct Scsi_Host *instance, struct device *dev)
 325  * Purpose : initialise FAS/NCR/AMD SCSI ic.
 326  * Params  : instance - a driver-specific filled-out structure
 327  * Returns : 0 on success
 328  */
 329 extern int fas216_add (struct Scsi_Host *instance, struct device *dev);
 330
 331 /* Function: int fas216_queue_command (Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
 332  * Purpose : queue a command for adapter to process.
 333  * Params  : SCpnt - Command to queue
 334  *           done  - done function to call once command is complete
 335  * Returns : 0 - success, else error
 336  */
 337 extern int fas216_queue_command (Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
 338
 339 /* Function: int fas216_noqueue_command (Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
 340  * Purpose : queue a command for adapter to process, and process it to completion.
 341  * Params  : SCpnt - Command to queue
 342  *           done  - done function to call once command is complete
 343  * Returns : 0 - success, else error
 344  */
 345 extern int fas216_noqueue_command (Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
 346
 347 /* Function: irqreturn_t fas216_intr (FAS216_Info *info)
 348  * Purpose : handle interrupts from the interface to progress a command
 349  * Params  : info - interface to service
 350  */
 351 extern irqreturn_t fas216_intr (FAS216_Info *info);
 352
 353 extern void fas216_remove (struct Scsi_Host *instance);
 354
 355 /* Function: void fas216_release (struct Scsi_Host *instance)
 356  * Purpose : release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
 357  * Params  : instance - a driver-specific filled-out structure
 358  * Returns : 0 on success
 359  */
 360 extern void fas216_release (struct Scsi_Host *instance);
 361
 362 extern int fas216_print_host(FAS216_Info *info, char *buffer);
 363 extern int fas216_print_stats(FAS216_Info *info, char *buffer);
 364 extern int fas216_print_devices(FAS216_Info *info, char *buffer);
 365
 366 /* Function: int fas216_eh_abort(Scsi_Cmnd *SCpnt)
 367  * Purpose : abort this command
 368  * Params  : SCpnt - command to abort
 369  * Returns : FAILED if unable to abort
 370  */
 371 extern int fas216_eh_abort(Scsi_Cmnd *SCpnt);
 372
 373 /* Function: int fas216_eh_device_reset(Scsi_Cmnd *SCpnt)
 374  * Purpose : Reset the device associated with this command
 375  * Params  : SCpnt - command specifing device to reset
 376  * Returns : FAILED if unable to reset
 377  */
 378 extern int fas216_eh_device_reset(Scsi_Cmnd *SCpnt);
 379
 380 /* Function: int fas216_eh_bus_reset(Scsi_Cmnd *SCpnt)
 381  * Purpose : Reset the complete bus associated with this command
 382  * Params  : SCpnt - command specifing bus to reset
 383  * Returns : FAILED if unable to reset
 384  */
 385 extern int fas216_eh_bus_reset(Scsi_Cmnd *SCpnt);
 386
 387 /* Function: int fas216_eh_host_reset(Scsi_Cmnd *SCpnt)
 388  * Purpose : Reset the host associated with this command
 389  * Params  : SCpnt - command specifing host to reset
 390  * Returns : FAILED if unable to reset
 391  */
 392 extern int fas216_eh_host_reset(Scsi_Cmnd *SCpnt);
 393
 394 #endif /* FAS216_H */