drivers/scsi/NCR5380.h

   1 /*
   2  * NCR 5380 defines
   3  *
   4  * Copyright 1993, Drew Eckhardt
   5  *      Visionary Computing
   6  *      (Unix consulting and custom programming)
   7  *      drew@colorado.edu
   8  *      +1 (303) 666-5836
   9  *
  10  * DISTRIBUTION RELEASE 7
  11  *
  12  * For more information, please consult
  13  *
  14  * NCR 5380 Family
  15  * SCSI Protocol Controller
  16  * Databook
  17  * NCR Microelectronics
  18  * 1635 Aeroplaza Drive
  19  * Colorado Springs, CO 80916
  20  * 1+ (719) 578-3400
  21  * 1+ (800) 334-5454
  22  */
  23
  24 /*
  25  * $Log: NCR5380.h,v $
  26  */
  27
  28 #ifndef NCR5380_H
  29 #define NCR5380_H
  30
  31 #include <linux/interrupt.h>
  32
  33 #ifdef AUTOSENSE
  34 #include <scsi/scsi_eh.h>
  35 #endif
  36
  37 #define NCR5380_PUBLIC_RELEASE 7
  38 #define NCR53C400_PUBLIC_RELEASE 2
  39
  40 #define NDEBUG_ARBITRATION      0x1
  41 #define NDEBUG_AUTOSENSE        0x2
  42 #define NDEBUG_DMA              0x4
  43 #define NDEBUG_HANDSHAKE        0x8
  44 #define NDEBUG_INFORMATION      0x10
  45 #define NDEBUG_INIT             0x20
  46 #define NDEBUG_INTR             0x40
  47 #define NDEBUG_LINKED           0x80
  48 #define NDEBUG_MAIN             0x100
  49 #define NDEBUG_NO_DATAOUT       0x200
  50 #define NDEBUG_NO_WRITE         0x400
  51 #define NDEBUG_PIO              0x800
  52 #define NDEBUG_PSEUDO_DMA       0x1000
  53 #define NDEBUG_QUEUES           0x2000
  54 #define NDEBUG_RESELECTION      0x4000
  55 #define NDEBUG_SELECTION        0x8000
  56 #define NDEBUG_USLEEP           0x10000
  57 #define NDEBUG_LAST_BYTE_SENT   0x20000
  58 #define NDEBUG_RESTART_SELECT   0x40000
  59 #define NDEBUG_EXTENDED         0x80000
  60 #define NDEBUG_C400_PREAD       0x100000
  61 #define NDEBUG_C400_PWRITE      0x200000
  62 #define NDEBUG_LISTS            0x400000
  63
  64 #define NDEBUG_ANY              0xFFFFFFFFUL
  65
  66 /*
  67  * The contents of the OUTPUT DATA register are asserted on the bus when
  68  * either arbitration is occurring or the phase-indicating signals (
  69  * IO, CD, MSG) in the TARGET COMMAND register and the ASSERT DATA
  70  * bit in the INITIATOR COMMAND register is set.
  71  */
  72
  73 #define OUTPUT_DATA_REG         0       /* wo DATA lines on SCSI bus */
  74 #define CURRENT_SCSI_DATA_REG   0       /* ro same */
  75
  76 #define INITIATOR_COMMAND_REG   1       /* rw */
  77 #define ICR_ASSERT_RST          0x80    /* rw Set to assert RST  */
  78 #define ICR_ARBITRATION_PROGRESS 0x40   /* ro Indicates arbitration complete */
  79 #define ICR_TRI_STATE           0x40    /* wo Set to tri-state drivers */
  80 #define ICR_ARBITRATION_LOST    0x20    /* ro Indicates arbitration lost */
  81 #define ICR_DIFF_ENABLE         0x20    /* wo Set to enable diff. drivers */
  82 #define ICR_ASSERT_ACK          0x10    /* rw ini Set to assert ACK */
  83 #define ICR_ASSERT_BSY          0x08    /* rw Set to assert BSY */
  84 #define ICR_ASSERT_SEL          0x04    /* rw Set to assert SEL */
  85 #define ICR_ASSERT_ATN          0x02    /* rw Set to assert ATN */
  86 #define ICR_ASSERT_DATA         0x01    /* rw SCSI_DATA_REG is asserted */
  87
  88 #ifdef DIFFERENTIAL
  89 #define ICR_BASE                ICR_DIFF_ENABLE
  90 #else
  91 #define ICR_BASE                0
  92 #endif
  93
  94 #define MODE_REG                2
  95 /*
  96  * Note : BLOCK_DMA code will keep DRQ asserted for the duration of the
  97  * transfer, causing the chip to hog the bus.  You probably don't want
  98  * this.
  99  */
 100 #define MR_BLOCK_DMA_MODE       0x80    /* rw block mode DMA */
 101 #define MR_TARGET               0x40    /* rw target mode */
 102 #define MR_ENABLE_PAR_CHECK     0x20    /* rw enable parity checking */
 103 #define MR_ENABLE_PAR_INTR      0x10    /* rw enable bad parity interrupt */
 104 #define MR_ENABLE_EOP_INTR      0x08    /* rw enable eop interrupt */
 105 #define MR_MONITOR_BSY          0x04    /* rw enable int on unexpected bsy fail */
 106 #define MR_DMA_MODE             0x02    /* rw DMA / pseudo DMA mode */
 107 #define MR_ARBITRATE            0x01    /* rw start arbitration */
 108
 109 #ifdef PARITY
 110 #define MR_BASE                 MR_ENABLE_PAR_CHECK
 111 #else
 112 #define MR_BASE                 0
 113 #endif
 114
 115 #define TARGET_COMMAND_REG      3
 116 #define TCR_LAST_BYTE_SENT      0x80    /* ro DMA done */
 117 #define TCR_ASSERT_REQ          0x08    /* tgt rw assert REQ */
 118 #define TCR_ASSERT_MSG          0x04    /* tgt rw assert MSG */
 119 #define TCR_ASSERT_CD           0x02    /* tgt rw assert CD */
 120 #define TCR_ASSERT_IO           0x01    /* tgt rw assert IO */
 121
 122 #define STATUS_REG              4       /* ro */
 123 /*
 124  * Note : a set bit indicates an active signal, driven by us or another
 125  * device.
 126  */
 127 #define SR_RST                  0x80
 128 #define SR_BSY                  0x40
 129 #define SR_REQ                  0x20
 130 #define SR_MSG                  0x10
 131 #define SR_CD                   0x08
 132 #define SR_IO                   0x04
 133 #define SR_SEL                  0x02
 134 #define SR_DBP                  0x01
 135
 136 /*
 137  * Setting a bit in this register will cause an interrupt to be generated when
 138  * BSY is false and SEL true and this bit is asserted  on the bus.
 139  */
 140 #define SELECT_ENABLE_REG       4       /* wo */
 141
 142 #define BUS_AND_STATUS_REG      5       /* ro */
 143 #define BASR_END_DMA_TRANSFER   0x80    /* ro set on end of transfer */
 144 #define BASR_DRQ                0x40    /* ro mirror of DRQ pin */
 145 #define BASR_PARITY_ERROR       0x20    /* ro parity error detected */
 146 #define BASR_IRQ                0x10    /* ro mirror of IRQ pin */
 147 #define BASR_PHASE_MATCH        0x08    /* ro Set when MSG CD IO match TCR */
 148 #define BASR_BUSY_ERROR         0x04    /* ro Unexpected change to inactive state */
 149 #define BASR_ATN                0x02    /* ro BUS status */
 150 #define BASR_ACK                0x01    /* ro BUS status */
 151
 152 /* Write any value to this register to start a DMA send */
 153 #define START_DMA_SEND_REG      5       /* wo */
 154
 155 /*
 156  * Used in DMA transfer mode, data is latched from the SCSI bus on
 157  * the falling edge of REQ (ini) or ACK (tgt)
 158  */
 159 #define INPUT_DATA_REG                  6       /* ro */
 160
 161 /* Write any value to this register to start a DMA receive */
 162 #define START_DMA_TARGET_RECEIVE_REG    6       /* wo */
 163
 164 /* Read this register to clear interrupt conditions */
 165 #define RESET_PARITY_INTERRUPT_REG      7       /* ro */
 166
 167 /* Write any value to this register to start an ini mode DMA receive */
 168 #define START_DMA_INITIATOR_RECEIVE_REG 7       /* wo */
 169
 170 #define C400_CONTROL_STATUS_REG NCR53C400_register_offset-8     /* rw */
 171
 172 #define CSR_RESET              0x80     /* wo  Resets 53c400 */
 173 #define CSR_53C80_REG          0x80     /* ro  5380 registers busy */
 174 #define CSR_TRANS_DIR          0x40     /* rw  Data transfer direction */
 175 #define CSR_SCSI_BUFF_INTR     0x20     /* rw  Enable int on transfer ready */
 176 #define CSR_53C80_INTR         0x10     /* rw  Enable 53c80 interrupts */
 177 #define CSR_SHARED_INTR        0x08     /* rw  Interrupt sharing */
 178 #define CSR_HOST_BUF_NOT_RDY   0x04     /* ro  Is Host buffer ready */
 179 #define CSR_SCSI_BUF_RDY       0x02     /* ro  SCSI buffer read */
 180 #define CSR_GATED_53C80_IRQ    0x01     /* ro  Last block xferred */
 181
 182 #if 0
 183 #define CSR_BASE CSR_SCSI_BUFF_INTR | CSR_53C80_INTR
 184 #else
 185 #define CSR_BASE CSR_53C80_INTR
 186 #endif
 187
 188 /* Number of 128-byte blocks to be transferred */
 189 #define C400_BLOCK_COUNTER_REG   NCR53C400_register_offset-7    /* rw */
 190
 191 /* Resume transfer after disconnect */
 192 #define C400_RESUME_TRANSFER_REG NCR53C400_register_offset-6    /* wo */
 193
 194 /* Access to host buffer stack */
 195 #define C400_HOST_BUFFER         NCR53C400_register_offset-4    /* rw */
 196
 197
 198 /* Note : PHASE_* macros are based on the values of the STATUS register */
 199 #define PHASE_MASK      (SR_MSG | SR_CD | SR_IO)
 200
 201 #define PHASE_DATAOUT           0
 202 #define PHASE_DATAIN            SR_IO
 203 #define PHASE_CMDOUT            SR_CD
 204 #define PHASE_STATIN            (SR_CD | SR_IO)
 205 #define PHASE_MSGOUT            (SR_MSG | SR_CD)
 206 #define PHASE_MSGIN             (SR_MSG | SR_CD | SR_IO)
 207 #define PHASE_UNKNOWN           0xff
 208
 209 /*
 210  * Convert status register phase to something we can use to set phase in
 211  * the target register so we can get phase mismatch interrupts on DMA
 212  * transfers.
 213  */
 214
 215 #define PHASE_SR_TO_TCR(phase) ((phase) >> 2)
 216
 217 /*
 218  * The internal should_disconnect() function returns these based on the
 219  * expected length of a disconnect if a device supports disconnect/
 220  * reconnect.
 221  */
 222
 223 #define DISCONNECT_NONE         0
 224 #define DISCONNECT_TIME_TO_DATA 1
 225 #define DISCONNECT_LONG         2
 226
 227 /*
 228  * These are "special" values for the tag parameter passed to NCR5380_select.
 229  */
 230
 231 #define TAG_NEXT        -1      /* Use next free tag */
 232 #define TAG_NONE        -2      /*
 233                                  * Establish I_T_L nexus instead of I_T_L_Q
 234                                  * even on SCSI-II devices.
 235                                  */
 236
 237 /*
 238  * These are "special" values for the irq and dma_channel fields of the
 239  * Scsi_Host structure
 240  */
 241
 242 #define SCSI_IRQ_NONE   255
 243 #define DMA_NONE        255
 244 #define IRQ_AUTO        254
 245 #define DMA_AUTO        254
 246 #define PORT_AUTO       0xffff  /* autoprobe io port for 53c400a */
 247
 248 #define FLAG_HAS_LAST_BYTE_SENT         1       /* NCR53c81 or better */
 249 #define FLAG_CHECK_LAST_BYTE_SENT       2       /* Only test once */
 250 #define FLAG_NCR53C400                  4       /* NCR53c400 */
 251 #define FLAG_NO_PSEUDO_DMA              8       /* Inhibit DMA */
 252 #define FLAG_DTC3181E                   16      /* DTC3181E */
 253
 254 #ifndef ASM
 255 struct NCR5380_hostdata {
 256         NCR5380_implementation_fields;          /* implementation specific */
 257         struct Scsi_Host *host;                 /* Host backpointer */
 258         unsigned char id_mask, id_higher_mask;  /* 1 << id, all bits greater */
 259         unsigned char targets_present;          /* targets we have connected
 260                                                    to, so we can call a select
 261                                                    failure a retryable condition */
 262         volatile unsigned char busy[8];         /* index = target, bit = lun */
 263 #if defined(REAL_DMA) || defined(REAL_DMA_POLL)
 264         volatile int dma_len;                   /* requested length of DMA */
 265 #endif
 266         volatile unsigned char last_message;    /* last message OUT */
 267         volatile Scsi_Cmnd *connected;          /* currently connected command */
 268         volatile Scsi_Cmnd *issue_queue;        /* waiting to be issued */
 269         volatile Scsi_Cmnd *disconnected_queue; /* waiting for reconnect */
 270         volatile int restart_select;            /* we have disconnected,
 271                                                    used to restart
 272                                                    NCR5380_select() */
 273         volatile unsigned aborted:1;            /* flag, says aborted */
 274         int flags;
 275         unsigned long time_expires;             /* in jiffies, set prior to sleeping */
 276         int select_time;                        /* timer in select for target response */
 277         volatile Scsi_Cmnd *selecting;
 278         struct delayed_work coroutine;          /* our co-routine */
 279 #ifdef NCR5380_STATS
 280         unsigned timebase;                      /* Base for time calcs */
 281         long time_read[8];                      /* time to do reads */
 282         long time_write[8];                     /* time to do writes */
 283         unsigned long bytes_read[8];            /* bytes read */
 284         unsigned long bytes_write[8];           /* bytes written */
 285         unsigned pendingr;
 286         unsigned pendingw;
 287 #endif
 288 #ifdef AUTOSENSE
 289         struct scsi_eh_save ses;
 290 #endif
 291 };
 292
 293 #ifdef __KERNEL__
 294
 295 #define dprintk(a,b)                    do {} while(0)
 296 #define NCR5380_dprint(a,b)             do {} while(0)
 297 #define NCR5380_dprint_phase(a,b)       do {} while(0)
 298
 299 #if defined(AUTOPROBE_IRQ)
 300 static int NCR5380_probe_irq(struct Scsi_Host *instance, int possible);
 301 #endif
 302 static int NCR5380_init(struct Scsi_Host *instance, int flags);
 303 static void NCR5380_exit(struct Scsi_Host *instance);
 304 static void NCR5380_information_transfer(struct Scsi_Host *instance);
 305 #ifndef DONT_USE_INTR
 306 static irqreturn_t NCR5380_intr(int irq, void *dev_id);
 307 #endif
 308 static void NCR5380_main(struct work_struct *work);
 309 static void __maybe_unused NCR5380_print_options(struct Scsi_Host *instance);
 310 #ifdef NDEBUG
 311 static void NCR5380_print_phase(struct Scsi_Host *instance);
 312 static void NCR5380_print(struct Scsi_Host *instance);
 313 #endif
 314 static int NCR5380_abort(Scsi_Cmnd * cmd);
 315 static int NCR5380_bus_reset(Scsi_Cmnd * cmd);
 316 static int NCR5380_queue_command(struct Scsi_Host *, struct scsi_cmnd *);
 317 static int __maybe_unused NCR5380_proc_info(struct Scsi_Host *instance,
 318         char *buffer, char **start, off_t offset, int length, int inout);
 319
 320 static void NCR5380_reselect(struct Scsi_Host *instance);
 321 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag);
 322 #if defined(PSEUDO_DMA) || defined(REAL_DMA) || defined(REAL_DMA_POLL)
 323 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data);
 324 #endif
 325 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data);
 326
 327 #if (defined(REAL_DMA) || defined(REAL_DMA_POLL))
 328
 329 #if defined(i386) || defined(__alpha__)
 330
 331 /**
 332  *      NCR5380_pc_dma_setup            -       setup ISA DMA
 333  *      @instance: adapter to set up
 334  *      @ptr: block to transfer (virtual address)
 335  *      @count: number of bytes to transfer
 336  *      @mode: DMA controller mode to use
 337  *
 338  *      Program the DMA controller ready to perform an ISA DMA transfer
 339  *      on this chip.
 340  *
 341  *      Locks: takes and releases the ISA DMA lock.
 342  */
 343
 344 static __inline__ int NCR5380_pc_dma_setup(struct Scsi_Host *instance, unsigned char *ptr, unsigned int count, unsigned char mode)
 345 {
 346         unsigned limit;
 347         unsigned long bus_addr = virt_to_bus(ptr);
 348         unsigned long flags;
 349
 350         if (instance->dma_channel <= 3) {
 351                 if (count > 65536)
 352                         count = 65536;
 353                 limit = 65536 - (bus_addr & 0xFFFF);
 354         } else {
 355                 if (count > 65536 * 2)
 356                         count = 65536 * 2;
 357                 limit = 65536 * 2 - (bus_addr & 0x1FFFF);
 358         }
 359
 360         if (count > limit)
 361                 count = limit;
 362
 363         if ((count & 1) || (bus_addr & 1))
 364                 panic("scsi%d : attempted unaligned DMA transfer\n", instance->host_no);
 365
 366         flags=claim_dma_lock();
 367         disable_dma(instance->dma_channel);
 368         clear_dma_ff(instance->dma_channel);
 369         set_dma_addr(instance->dma_channel, bus_addr);
 370         set_dma_count(instance->dma_channel, count);
 371         set_dma_mode(instance->dma_channel, mode);
 372         enable_dma(instance->dma_channel);
 373         release_dma_lock(flags);
 374
 375         return count;
 376 }
 377
 378 /**
 379  *      NCR5380_pc_dma_write_setup              -       setup ISA DMA write
 380  *      @instance: adapter to set up
 381  *      @ptr: block to transfer (virtual address)
 382  *      @count: number of bytes to transfer
 383  *
 384  *      Program the DMA controller ready to perform an ISA DMA write to the
 385  *      SCSI controller.
 386  *
 387  *      Locks: called routines take and release the ISA DMA lock.
 388  */
 389
 390 static __inline__ int NCR5380_pc_dma_write_setup(struct Scsi_Host *instance, unsigned char *src, unsigned int count)
 391 {
 392         return NCR5380_pc_dma_setup(instance, src, count, DMA_MODE_WRITE);
 393 }
 394
 395 /**
 396  *      NCR5380_pc_dma_read_setup               -       setup ISA DMA read
 397  *      @instance: adapter to set up
 398  *      @ptr: block to transfer (virtual address)
 399  *      @count: number of bytes to transfer
 400  *
 401  *      Program the DMA controller ready to perform an ISA DMA read from the
 402  *      SCSI controller.
 403  *
 404  *      Locks: called routines take and release the ISA DMA lock.
 405  */
 406
 407 static __inline__ int NCR5380_pc_dma_read_setup(struct Scsi_Host *instance, unsigned char *src, unsigned int count)
 408 {
 409         return NCR5380_pc_dma_setup(instance, src, count, DMA_MODE_READ);
 410 }
 411
 412 /**
 413  *      NCR5380_pc_dma_residual         -       return bytes left
 414  *      @instance: adapter
 415  *
 416  *      Reports the number of bytes left over after the DMA was terminated.
 417  *
 418  *      Locks: takes and releases the ISA DMA lock.
 419  */
 420
 421 static __inline__ int NCR5380_pc_dma_residual(struct Scsi_Host *instance)
 422 {
 423         unsigned long flags;
 424         int tmp;
 425
 426         flags = claim_dma_lock();
 427         clear_dma_ff(instance->dma_channel);
 428         tmp = get_dma_residue(instance->dma_channel);
 429         release_dma_lock(flags);
 430
 431         return tmp;
 432 }
 433 #endif                          /* defined(i386) || defined(__alpha__) */
 434 #endif                          /* defined(REAL_DMA)  */
 435 #endif                          /* __KERNEL__ */
 436 #endif                          /* ndef ASM */
 437 #endif                          /* NCR5380_H */