drivers/scsi/dtc.c

   1
   2 #define AUTOSENSE
   3 #define PSEUDO_DMA
   4 #define DONT_USE_INTR
   5 #define UNSAFE                  /* Leave interrupts enabled during pseudo-dma I/O */
   6 #define xNDEBUG (NDEBUG_INTR+NDEBUG_RESELECTION+\
   7                  NDEBUG_SELECTION+NDEBUG_ARBITRATION)
   8 #define DMA_WORKS_RIGHT
   9
  10
  11 /*
  12  * DTC 3180/3280 driver, by
  13  *      Ray Van Tassle  rayvt@comm.mot.com
  14  *
  15  *      taken from ...
  16  *      Trantor T128/T128F/T228 driver by...
  17  *
  18  *      Drew Eckhardt
  19  *      Visionary Computing
  20  *      (Unix and Linux consulting and custom programming)
  21  *      drew@colorado.edu
  22  *      +1 (303) 440-4894
  23  *
  24  * DISTRIBUTION RELEASE 1.
  25  *
  26  * For more information, please consult
  27  *
  28  * NCR 5380 Family
  29  * SCSI Protocol Controller
  30  * Databook
  31 */
  32
  33 /*
  34  * Options :
  35  * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
  36  *      for commands that return with a CHECK CONDITION status.
  37  *
  38  * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
  39  * increase compared to polled I/O.
  40  *
  41  * PARITY - enable parity checking.  Not supported.
  42  *
  43  * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.
  44  *              You probably want this.
  45  *
  46  * The card is detected and initialized in one of several ways :
  47  * 1.  Autoprobe (default) - since the board is memory mapped,
  48  *     a BIOS signature is scanned for to locate the registers.
  49  *     An interrupt is triggered to autoprobe for the interrupt
  50  *     line.
  51  *
  52  * 2.  With command line overrides - dtc=address,irq may be
  53  *     used on the LILO command line to override the defaults.
  54  *
  55 */
  56
  57 /*----------------------------------------------------------------*/
  58 /* the following will set the monitor border color (useful to find
  59  where something crashed or gets stuck at */
  60 /* 1 = blue
  61  2 = green
  62  3 = cyan
  63  4 = red
  64  5 = magenta
  65  6 = yellow
  66  7 = white
  67 */
  68 #if 0
  69 #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
  70 #else
  71 #define rtrc(i) {}
  72 #endif
  73
  74
  75 #include <linux/module.h>
  76 #include <linux/signal.h>
  77 #include <linux/blkdev.h>
  78 #include <linux/delay.h>
  79 #include <linux/stat.h>
  80 #include <linux/string.h>
  81 #include <linux/init.h>
  82 #include <linux/interrupt.h>
  83 #include <linux/io.h>
  84 #include "scsi.h"
  85 #include <scsi/scsi_host.h>
  86 #include "dtc.h"
  87 #define AUTOPROBE_IRQ
  88 #include "NCR5380.h"
  89
  90
  91 #define DTC_PUBLIC_RELEASE 2
  92
  93 /*
  94  * The DTC3180 & 3280 boards are memory mapped.
  95  *
  96  */
  97
  98 /*
  99  */
 100 /* Offset from DTC_5380_OFFSET */
 101 #define DTC_CONTROL_REG         0x100   /* rw */
 102 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
 103 #define CSR_DIR_READ            0x40    /* rw direction, 1 = read 0 = write */
 104
 105 #define CSR_RESET              0x80     /* wo  Resets 53c400 */
 106 #define CSR_5380_REG           0x80     /* ro  5380 registers can be accessed */
 107 #define CSR_TRANS_DIR          0x40     /* rw  Data transfer direction */
 108 #define CSR_SCSI_BUFF_INTR     0x20     /* rw  Enable int on transfer ready */
 109 #define CSR_5380_INTR          0x10     /* rw  Enable 5380 interrupts */
 110 #define CSR_SHARED_INTR        0x08     /* rw  Interrupt sharing */
 111 #define CSR_HOST_BUF_NOT_RDY   0x04     /* ro  Host buffer not ready */
 112 #define CSR_SCSI_BUF_RDY       0x02     /* ro  SCSI buffer ready */
 113 #define CSR_GATED_5380_IRQ     0x01     /* ro  Last block xferred */
 114 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
 115
 116
 117 #define DTC_BLK_CNT             0x101   /* rw
 118                                          * # of 128-byte blocks to transfer */
 119
 120
 121 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
 122
 123 #define DTC_SWITCH_REG          0x3982  /* ro - DIP switches */
 124 #define DTC_RESUME_XFER         0x3982  /* wo - resume data xfer
 125                                          * after disconnect/reconnect*/
 126
 127 #define DTC_5380_OFFSET         0x3880  /* 8 registers here, see NCR5380.h */
 128
 129 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
 130 #define DTC_DATA_BUF            0x3900  /* rw 128 bytes long */
 131
 132 static struct override {
 133         unsigned int address;
 134         int irq;
 135 } overrides
 136 #ifdef OVERRIDE
 137 [] __initdata = OVERRIDE;
 138 #else
 139 [4] __initdata = {
 140         { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
 141 };
 142 #endif
 143
 144 #define NO_OVERRIDES ARRAY_SIZE(overrides)
 145
 146 static struct base {
 147         unsigned long address;
 148         int noauto;
 149 } bases[] __initdata = {
 150         { 0xcc000, 0 },
 151         { 0xc8000, 0 },
 152         { 0xdc000, 0 },
 153         { 0xd8000, 0 }
 154 };
 155
 156 #define NO_BASES ARRAY_SIZE(bases)
 157
 158 static const struct signature {
 159         const char *string;
 160         int offset;
 161 } signatures[] = {
 162         {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
 163 };
 164
 165 #define NO_SIGNATURES ARRAY_SIZE(signatures)
 166
 167 #ifndef MODULE
 168 /*
 169  * Function : dtc_setup(char *str, int *ints)
 170  *
 171  * Purpose : LILO command line initialization of the overrides array,
 172  *
 173  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 174  *      equal to the number of ints.
 175  *
 176  */
 177
 178 static void __init dtc_setup(char *str, int *ints)
 179 {
 180         static int commandline_current = 0;
 181         int i;
 182         if (ints[0] != 2)
 183                 printk("dtc_setup: usage dtc=address,irq\n");
 184         else if (commandline_current < NO_OVERRIDES) {
 185                 overrides[commandline_current].address = ints[1];
 186                 overrides[commandline_current].irq = ints[2];
 187                 for (i = 0; i < NO_BASES; ++i)
 188                         if (bases[i].address == ints[1]) {
 189                                 bases[i].noauto = 1;
 190                                 break;
 191                         }
 192                 ++commandline_current;
 193         }
 194 }
 195 #endif
 196
 197 /*
 198  * Function : int dtc_detect(struct scsi_host_template * tpnt)
 199  *
 200  * Purpose : detects and initializes DTC 3180/3280 controllers
 201  *      that were autoprobed, overridden on the LILO command line,
 202  *      or specified at compile time.
 203  *
 204  * Inputs : tpnt - template for this SCSI adapter.
 205  *
 206  * Returns : 1 if a host adapter was found, 0 if not.
 207  *
 208 */
 209
 210 static int __init dtc_detect(struct scsi_host_template * tpnt)
 211 {
 212         static int current_override = 0, current_base = 0;
 213         struct Scsi_Host *instance;
 214         unsigned int addr;
 215         void __iomem *base;
 216         int sig, count;
 217
 218         tpnt->proc_name = "dtc3x80";
 219         tpnt->show_info = dtc_show_info;
 220         tpnt->write_info = dtc_write_info;
 221
 222         for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 223                 addr = 0;
 224                 base = NULL;
 225
 226                 if (overrides[current_override].address) {
 227                         addr = overrides[current_override].address;
 228                         base = ioremap(addr, 0x2000);
 229                         if (!base)
 230                                 addr = 0;
 231                 } else
 232                         for (; !addr && (current_base < NO_BASES); ++current_base) {
 233 #if (DTCDEBUG & DTCDEBUG_INIT)
 234                                 printk(KERN_DEBUG "scsi-dtc : probing address %08x\n", bases[current_base].address);
 235 #endif
 236                                 if (bases[current_base].noauto)
 237                                         continue;
 238                                 base = ioremap(bases[current_base].address, 0x2000);
 239                                 if (!base)
 240                                         continue;
 241                                 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
 242                                         if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
 243                                                 addr = bases[current_base].address;
 244 #if (DTCDEBUG & DTCDEBUG_INIT)
 245                                                 printk(KERN_DEBUG "scsi-dtc : detected board.\n");
 246 #endif
 247                                                 goto found;
 248                                         }
 249                                 }
 250                                 iounmap(base);
 251                         }
 252
 253 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 254                 printk(KERN_DEBUG "scsi-dtc : base = %08x\n", addr);
 255 #endif
 256
 257                 if (!addr)
 258                         break;
 259
 260 found:
 261                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 262                 if (instance == NULL)
 263                         break;
 264
 265                 instance->base = addr;
 266                 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
 267
 268                 NCR5380_init(instance, 0);
 269
 270                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);  /* Enable int's */
 271                 if (overrides[current_override].irq != IRQ_AUTO)
 272                         instance->irq = overrides[current_override].irq;
 273                 else
 274                         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
 275
 276 #ifndef DONT_USE_INTR
 277                 /* With interrupts enabled, it will sometimes hang when doing heavy
 278                  * reads. So better not enable them until I finger it out. */
 279                 if (instance->irq != SCSI_IRQ_NONE)
 280                         if (request_irq(instance->irq, dtc_intr, IRQF_DISABLED,
 281                                         "dtc", instance)) {
 282                                 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 283                                 instance->irq = SCSI_IRQ_NONE;
 284                         }
 285
 286                 if (instance->irq == SCSI_IRQ_NONE) {
 287                         printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 288                         printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 289                 }
 290 #else
 291                 if (instance->irq != SCSI_IRQ_NONE)
 292                         printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
 293                 instance->irq = SCSI_IRQ_NONE;
 294 #endif
 295 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 296                 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
 297 #endif
 298
 299                 printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
 300                 if (instance->irq == SCSI_IRQ_NONE)
 301                         printk(" interrupts disabled");
 302                 else
 303                         printk(" irq %d", instance->irq);
 304                 printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
 305                 NCR5380_print_options(instance);
 306                 printk("\n");
 307
 308                 ++current_override;
 309                 ++count;
 310         }
 311         return count;
 312 }
 313
 314 /*
 315  * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
 316  *
 317  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 318  *      the specified device / size.
 319  *
 320  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 321  *      major / minor, ip[] = {heads, sectors, cylinders}
 322  *
 323  * Returns : always 0 (success), initializes ip
 324  *
 325 */
 326
 327 /*
 328  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 329  * using hard disks on a trantor should verify that this mapping corresponds
 330  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 331  * and matching the H_C_S coordinates to what DOS uses.
 332 */
 333
 334 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
 335                          sector_t capacity, int *ip)
 336 {
 337         int size = capacity;
 338
 339         ip[0] = 64;
 340         ip[1] = 32;
 341         ip[2] = size >> 11;
 342         return 0;
 343 }
 344
 345
 346 /****************************************************************
 347  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 348  *      unsigned char *dst, int len)
 349  *
 350  * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
 351  *      dst
 352  *
 353  * Inputs : dst = destination, len = length in bytes
 354  *
 355  * Returns : 0 on success, non zero on a failure such as a watchdog
 356  *      timeout.
 357 */
 358
 359 static int dtc_maxi = 0;
 360 static int dtc_wmaxi = 0;
 361
 362 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 363 {
 364         unsigned char *d = dst;
 365         int i;                  /* For counting time spent in the poll-loop */
 366         NCR5380_local_declare();
 367         NCR5380_setup(instance);
 368
 369         i = 0;
 370         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 371         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 372         if (instance->irq == SCSI_IRQ_NONE)
 373                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
 374         else
 375                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
 376         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 377         rtrc(1);
 378         while (len > 0) {
 379                 rtrc(2);
 380                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 381                         ++i;
 382                 rtrc(3);
 383                 memcpy_fromio(d, base + DTC_DATA_BUF, 128);
 384                 d += 128;
 385                 len -= 128;
 386                 rtrc(7);
 387                 /*** with int's on, it sometimes hangs after here.
 388                  * Looks like something makes HBNR go away. */
 389         }
 390         rtrc(4);
 391         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 392                 ++i;
 393         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 394         rtrc(0);
 395         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 396         if (i > dtc_maxi)
 397                 dtc_maxi = i;
 398         return (0);
 399 }
 400
 401 /****************************************************************
 402  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 403  *      unsigned char *src, int len)
 404  *
 405  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 406  *      src
 407  *
 408  * Inputs : src = source, len = length in bytes
 409  *
 410  * Returns : 0 on success, non zero on a failure such as a watchdog
 411  *      timeout.
 412 */
 413
 414 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 415 {
 416         int i;
 417         NCR5380_local_declare();
 418         NCR5380_setup(instance);
 419
 420         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 421         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 422         /* set direction (write) */
 423         if (instance->irq == SCSI_IRQ_NONE)
 424                 NCR5380_write(DTC_CONTROL_REG, 0);
 425         else
 426                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
 427         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 428         for (i = 0; len > 0; ++i) {
 429                 rtrc(5);
 430                 /* Poll until the host buffer can accept data. */
 431                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 432                         ++i;
 433                 rtrc(3);
 434                 memcpy_toio(base + DTC_DATA_BUF, src, 128);
 435                 src += 128;
 436                 len -= 128;
 437         }
 438         rtrc(4);
 439         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 440                 ++i;
 441         rtrc(6);
 442         /* Wait until the last byte has been sent to the disk */
 443         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 444                 ++i;
 445         rtrc(7);
 446         /* Check for parity error here. fixme. */
 447         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 448         rtrc(0);
 449         if (i > dtc_wmaxi)
 450                 dtc_wmaxi = i;
 451         return (0);
 452 }
 453
 454 MODULE_LICENSE("GPL");
 455
 456 #include "NCR5380.c"
 457
 458 static int dtc_release(struct Scsi_Host *shost)
 459 {
 460         NCR5380_local_declare();
 461         NCR5380_setup(shost);
 462         if (shost->irq)
 463                 free_irq(shost->irq, shost);
 464         NCR5380_exit(shost);
 465         if (shost->io_port && shost->n_io_port)
 466                 release_region(shost->io_port, shost->n_io_port);
 467         scsi_unregister(shost);
 468         iounmap(base);
 469         return 0;
 470 }
 471
 472 static struct scsi_host_template driver_template = {
 473         .name                           = "DTC 3180/3280 ",
 474         .detect                         = dtc_detect,
 475         .release                        = dtc_release,
 476         .queuecommand                   = dtc_queue_command,
 477         .eh_abort_handler               = dtc_abort,
 478         .eh_bus_reset_handler           = dtc_bus_reset,
 479         .bios_param                     = dtc_biosparam,
 480         .can_queue                      = CAN_QUEUE,
 481         .this_id                        = 7,
 482         .sg_tablesize                   = SG_ALL,
 483         .cmd_per_lun                    = CMD_PER_LUN,
 484         .use_clustering                 = DISABLE_CLUSTERING,
 485 };
 486 #include "scsi_module.c"