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