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