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