drivers/scsi/NCR5380.h

/* */
This source file includes following definitions.
NCR5380_i386_dma_setup
NCR5380_i386_dma_write_setup
NCR5380_i386_dma_read_setup
NCR5380_i386_dma_residual
   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 6
  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 #define NCR5380_PUBLIC_RELEASE 6
  32 #define NCR53C400_PUBLIC_RELEASE 2
  33 
  34 #define NDEBUG_ARBITRATION      0x1
  35 #define NDEBUG_AUTOSENSE        0x2
  36 #define NDEBUG_DMA              0x4
  37 #define NDEBUG_HANDSHAKE        0x8
  38 #define NDEBUG_INFORMATION      0x10
  39 #define NDEBUG_INIT             0x20
  40 #define NDEBUG_INTR             0x40
  41 #define NDEBUG_LINKED           0x80
  42 #define NDEBUG_MAIN             0x100
  43 #define NDEBUG_NO_DATAOUT       0x200
  44 #define NDEBUG_NO_WRITE         0x400
  45 #define NDEBUG_PIO              0x800
  46 #define NDEBUG_PSEUDO_DMA       0x1000
  47 #define NDEBUG_QUEUES           0x2000
  48 #define NDEBUG_RESELECTION      0x4000
  49 #define NDEBUG_SELECTION        0x8000
  50 #define NDEBUG_USLEEP           0x10000
  51 #define NDEBUG_LAST_BYTE_SENT   0x20000
  52 #define NDEBUG_RESTART_SELECT   0x40000
  53 #define NDEBUG_EXTENDED         0x80000
  54 #define NDEBUG_C400_PREAD       0x100000
  55 #define NDEBUG_C400_PWRITE      0x200000
  56 #define NDEBUG_LISTS            0x400000
  57 
  58 /* 
  59  * The contents of the OUTPUT DATA register are asserted on the bus when
  60  * either arbitration is occurring or the phase-indicating signals (
  61  * IO, CD, MSG) in the TARGET COMMAND register and the ASSERT DATA
  62  * bit in the INITIATOR COMMAND register is set.
  63  */
  64 
  65 #define OUTPUT_DATA_REG         0       /* wo DATA lines on SCSI bus */
  66 #define CURRENT_SCSI_DATA_REG   0       /* ro same */
  67 
  68 #define INITIATOR_COMMAND_REG   1       /* rw */
  69 #define ICR_ASSERT_RST          0x80    /* rw Set to assert RST  */
  70 #define ICR_ARBITRATION_PROGRESS 0x40   /* ro Indicates arbitration complete */
  71 #define ICR_TRI_STATE           0x40    /* wo Set to tri-state drivers */
  72 #define ICR_ARBITRATION_LOST    0x20    /* ro Indicates arbitration lost */
  73 #define ICR_DIFF_ENABLE         0x20    /* wo Set to enable diff. drivers */
  74 #define ICR_ASSERT_ACK          0x10    /* rw ini Set to assert ACK */
  75 #define ICR_ASSERT_BSY          0x08    /* rw Set to assert BSY */
  76 #define ICR_ASSERT_SEL          0x04    /* rw Set to assert SEL */
  77 #define ICR_ASSERT_ATN          0x02    /* rw Set to assert ATN */
  78 #define ICR_ASSERT_DATA         0x01    /* rw SCSI_DATA_REG is asserted */
  79 
  80 #ifdef DIFFERENTIAL
  81 #define ICR_BASE                ICR_DIFF_ENABLE
  82 #else
  83 #define ICR_BASE                0
  84 #endif
  85 
  86 #define MODE_REG                2
  87 /*
  88  * Note : BLOCK_DMA code will keep DRQ asserted for the duration of the 
  89  * transfer, causing the chip to hog the bus.  You probably don't want 
  90  * this.
  91  */
  92 #define MR_BLOCK_DMA_MODE       0x80    /* rw block mode DMA */
  93 #define MR_TARGET               0x40    /* rw target mode */
  94 #define MR_ENABLE_PAR_CHECK   0x20      /* rw enable parity checking */
  95 #define MR_ENABLE_PAR_INTR      0x10    /* rw enable bad parity interrupt */
  96 #define MR_ENABLE_EOP_INTR      0x08    /* rw enable eop interrupt */
  97 #define MR_MONITOR_BSY  0x04    /* rw enable int on unexpected bsy fail */
  98 #define MR_DMA_MODE             0x02    /* rw DMA / pseudo DMA mode */
  99 #define MR_ARBITRATE            0x01    /* rw start arbitration */
 100 
 101 #ifdef PARITY
 102 #define MR_BASE                 MR_ENABLE_PAR_CHECK
 103 #else
 104 #define MR_BASE                 0
 105 #endif
 106 
 107 #define TARGET_COMMAND_REG      3
 108 #define TCR_LAST_BYTE_SENT      0x80    /* ro DMA done */
 109 #define TCR_ASSERT_REQ          0x08    /* tgt rw assert REQ */
 110 #define TCR_ASSERT_MSG          0x04    /* tgt rw assert MSG */
 111 #define TCR_ASSERT_CD           0x02    /* tgt rw assert CD */
 112 #define TCR_ASSERT_IO           0x01    /* tgt rw assert IO */
 113 
 114 #define STATUS_REG              4       /* ro */
 115 /*
 116  * Note : a set bit indicates an active signal, driven by us or another 
 117  * device.
 118  */
 119 #define SR_RST                  0x80    
 120 #define SR_BSY                  0x40
 121 #define SR_REQ                  0x20
 122 #define SR_MSG                  0x10
 123 #define SR_CD                   0x08
 124 #define SR_IO                   0x04
 125 #define SR_SEL                  0x02
 126 #define SR_DBP                  0x01
 127 
 128 /*
 129  * Setting a bit in this register will cause an interrupt to be generated when 
 130  * BSY is false and SEL true and this bit is asserted  on the bus.
 131  */
 132 #define SELECT_ENABLE_REG       4       /* wo */
 133 
 134 #define BUS_AND_STATUS_REG      5       /* ro */
 135 #define BASR_END_DMA_TRANSFER   0x80    /* ro set on end of transfer */
 136 #define BASR_DRQ                0x40    /* ro mirror of DRQ pin */
 137 #define BASR_PARITY_ERROR       0x20    /* ro parity error detected */
 138 #define BASR_IRQ                0x10    /* ro mirror of IRQ pin */
 139 #define BASR_PHASE_MATCH        0x08    /* ro Set when MSG CD IO match TCR */
 140 #define BASR_BUSY_ERROR         0x04    /* ro Unexpected change to inactive state */
 141 #define BASR_ATN                0x02    /* ro BUS status */
 142 #define BASR_ACK                0x01    /* ro BUS status */
 143 
 144 /* Write any value to this register to start a DMA send */
 145 #define START_DMA_SEND_REG      5       /* wo */
 146 
 147 /* 
 148  * Used in DMA transfer mode, data is latched from the SCSI bus on
 149  * the falling edge of REQ (ini) or ACK (tgt)
 150  */
 151 #define INPUT_DATA_REG                  6       /* ro */
 152 
 153 /* Write any value to this register to start a DMA receive */
 154 #define START_DMA_TARGET_RECEIVE_REG    6       /* wo */
 155 
 156 /* Read this register to clear interrupt conditions */
 157 #define RESET_PARITY_INTERRUPT_REG      7       /* ro */
 158 
 159 /* Write any value to this register to start an ini mode DMA receive */
 160 #define START_DMA_INITIATOR_RECEIVE_REG 7       /* wo */
 161 
 162 #define C400_CONTROL_STATUS_REG NCR53C400_register_offset-8      /* rw */
 163 
 164 #define CSR_RESET              0x80    /* wo  Resets 53c400 */
 165 #define CSR_53C80_REG          0x80    /* ro  5380 registers busy */
 166 #define CSR_TRANS_DIR          0x40    /* rw  Data transfer direction */
 167 #define CSR_SCSI_BUFF_INTR     0x20    /* rw  Enable int on transfer ready */
 168 #define CSR_53C80_INTR         0x10    /* rw  Enable 53c80 interrupts */
 169 #define CSR_SHARED_INTR        0x08    /* rw  Interrupt sharing */
 170 #define CSR_HOST_BUF_NOT_RDY   0x04    /* ro  Is Host buffer ready */
 171 #define CSR_SCSI_BUF_RDY       0x02    /* ro  SCSI buffer read */
 172 #define CSR_GATED_53C80_IRQ    0x01    /* ro  Last block xferred */
 173 
 174 #if 0
 175 #define CSR_BASE CSR_SCSI_BUFF_INTR | CSR_53C80_INTR
 176 #else
 177 #define CSR_BASE CSR_53C80_INTR
 178 #endif
 179 
 180 /* Number of 128-byte blocks to be transferred */
 181 #define C400_BLOCK_COUNTER_REG   NCR53C400_register_offset-7      /* rw */
 182 
 183 /* Resume transfer after disconnect */
 184 #define C400_RESUME_TRANSFER_REG NCR53C400_register_offset-6      /* wo */
 185 
 186 /* Access to host buffer stack */
 187 #define C400_HOST_BUFFER         NCR53C400_register_offset-4      /* rw */
 188 
 189 
 190 /* Note : PHASE_* macros are based on the values of the STATUS register */
 191 #define PHASE_MASK      (SR_MSG | SR_CD | SR_IO)
 192 
 193 #define PHASE_DATAOUT           0
 194 #define PHASE_DATAIN            SR_IO
 195 #define PHASE_CMDOUT            SR_CD
 196 #define PHASE_STATIN            (SR_CD | SR_IO)
 197 #define PHASE_MSGOUT            (SR_MSG | SR_CD)
 198 #define PHASE_MSGIN             (SR_MSG | SR_CD | SR_IO)
 199 #define PHASE_UNKNOWN           0xff
 200 
 201 /* 
 202  * Convert status register phase to something we can use to set phase in 
 203  * the target register so we can get phase mismatch interrupts on DMA 
 204  * transfers.
 205  */
 206  
 207 #define PHASE_SR_TO_TCR(phase) ((phase) >> 2)   
 208 
 209 /*
 210  * The internal should_disconnect() function returns these based on the 
 211  * expected length of a disconnect if a device supports disconnect/
 212  * reconnect.
 213  */
 214 
 215 #define DISCONNECT_NONE         0
 216 #define DISCONNECT_TIME_TO_DATA 1
 217 #define DISCONNECT_LONG         2
 218 
 219 /* 
 220  * These are "special" values for the tag parameter passed to NCR5380_select.
 221  */
 222 
 223 #define TAG_NEXT        -1      /* Use next free tag */
 224 #define TAG_NONE        -2      /* 
 225                                  * Establish I_T_L nexus instead of I_T_L_Q
 226                                  * even on SCSI-II devices.
 227                                  */
 228 
 229 /*
 230  * These are "special" values for the irq and dma_channel fields of the 
 231  * Scsi_Host structure
 232  */
 233 
 234 #define IRQ_NONE        255
 235 #define DMA_NONE        255
 236 #define IRQ_AUTO        254
 237 #define DMA_AUTO        254
 238 
 239 #define FLAG_HAS_LAST_BYTE_SENT         1       /* NCR53c81 or better */
 240 #define FLAG_CHECK_LAST_BYTE_SENT       2       /* Only test once */
 241 #define FLAG_NCR53C400                  4       /* NCR53c400 */
 242 #define FLAG_NO_PSEUDO_DMA              8       /* Inhibit DMA */
 243 
 244 #ifndef ASM
 245 struct NCR5380_hostdata {
 246     NCR5380_implementation_fields;              /* implementation specific */
 247     unsigned char id_mask, id_higher_mask;      /* 1 << id, all bits greater */
 248     unsigned char targets_present;              /* targets we have connected
 249                                                    to, so we can call a select
 250                                                    failure a retryable condition */
 251     volatile unsigned char busy[8];             /* index = target, bit = lun */
 252 #if defined(REAL_DMA) || defined(REAL_DMA_POLL)
 253     volatile int dma_len;                       /* requested length of DMA */
 254 #endif
 255     volatile unsigned char last_message;        /* last message OUT */
 256     volatile Scsi_Cmnd *connected;              /* currently connected command */
 257     volatile Scsi_Cmnd *issue_queue;            /* waiting to be issued */
 258     volatile Scsi_Cmnd *disconnected_queue;     /* waiting for reconnect */
 259     volatile int restart_select;                /* we have disconnected,
 260                                                    used to restart 
 261                                                    NCR5380_select() */
 262     volatile unsigned aborted:1;                /* flag, says aborted */
 263     int flags;
 264 #ifdef USLEEP
 265     unsigned long time_expires;                 /* in jiffies, set prior to sleeping */
 266     struct Scsi_Host *next_timer;
 267 #endif
 268 };
 269 
 270 #ifdef __KERNEL__
 271 static struct Scsi_Host *first_instance;                /* linked list of 5380's */
 272 
 273 #if defined(AUTOPROBE_IRQ)
 274 static int NCR5380_probe_irq (struct Scsi_Host *instance, int possible);
 275 #endif
 276 static void NCR5380_init (struct Scsi_Host *instance, int flags);
 277 static void NCR5380_information_transfer (struct Scsi_Host *instance);
 278 static void NCR5380_intr (int irq, void *dev_id, struct pt_regs * regs);
 279 static void NCR5380_main (void);
 280 static void NCR5380_print_options (struct Scsi_Host *instance);
 281 static void NCR5380_print_phase (struct Scsi_Host *instance);
 282 static void NCR5380_print (struct Scsi_Host *instance);
 283 #ifndef NCR5380_abort
 284 static
 285 #endif
 286 int NCR5380_abort (Scsi_Cmnd *cmd);
 287 #ifndef NCR5380_reset
 288 static
 289 #endif
 290 int NCR5380_reset (Scsi_Cmnd *cmd);
 291 #ifndef NCR5380_queue_command
 292 static 
 293 #endif
 294 int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *));
 295 
 296 
 297 static void NCR5380_reselect (struct Scsi_Host *instance);
 298 static int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag);
 299 #if defined(PSEUDO_DMA) || defined(REAL_DMA) || defined(REAL_DMA_POLL)
 300 static int NCR5380_transfer_dma (struct Scsi_Host *instance,
 301         unsigned char *phase, int *count, unsigned char **data);
 302 #endif
 303 static int NCR5380_transfer_pio (struct Scsi_Host *instance,
 304         unsigned char *phase, int *count, unsigned char **data);
 305 
 306 #if (defined(REAL_DMA) || defined(REAL_DMA_POLL)) && defined(i386)
 307 static __inline__ int NCR5380_i386_dma_setup (struct Scsi_Host *instance,
     /*  */
 308         unsigned char *ptr, unsigned int count, unsigned char mode) {
 309     unsigned limit;
 310 
 311     if (instance->dma_channel <=3) {
 312         if (count > 65536)
 313             count = 65536;
 314         limit = 65536 - (((unsigned) ptr) & 0xFFFF);
 315     } else {
 316         if (count > 65536 * 2) 
 317             count = 65536 * 2;
 318         limit = 65536* 2 - (((unsigned) ptr) & 0x1FFFF);
 319     }
 320 
 321     if (count > limit) count = limit;
 322 
 323     if ((count & 1) || (((unsigned) ptr) & 1))
 324         panic ("scsi%d : attempted unaligned DMA transfer\n", instance->host_no);
 325     cli();
 326     disable_dma(instance->dma_channel);
 327     clear_dma_ff(instance->dma_channel);
 328     set_dma_addr(instance->dma_channel, (unsigned int) ptr);
 329     set_dma_count(instance->dma_channel, count);
 330     set_dma_mode(instance->dma_channel, mode);
 331     enable_dma(instance->dma_channel);
 332     sti();
 333     return count;
 334 }
 335 
 336 static __inline__ int NCR5380_i386_dma_write_setup (struct Scsi_Host *instance,
     /*  */
 337     unsigned char *src, unsigned int count) {
 338     return NCR5380_i386_dma_setup (instance, src, count, DMA_MODE_WRITE);
 339 }
 340 
 341 static __inline__ int NCR5380_i386_dma_read_setup (struct Scsi_Host *instance,
     /*  */
 342     unsigned char *src, unsigned int count) {
 343     return NCR5380_i386_dma_setup (instance, src, count, DMA_MODE_READ);
 344 }
 345 
 346 static __inline__ int NCR5380_i386_dma_residual (struct Scsi_Host *instance) {
     /*  */
 347     register int tmp;
 348     cli();
 349     clear_dma_ff(instance->dma_channel);
 350     tmp = get_dma_residue(instance->dma_channel);
 351     sti();
 352     return tmp;
 353 }
 354 #endif /* defined(REAL_DMA) && defined(i386)  */
 355 #endif __KERNEL_
 356 #endif /* ndef ASM */
 357 #endif /* NCR5380_H */
/* */
root/drivers/scsi/NCR5380.h

INCLUDED FROM

DEFINITIONS
