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 }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
 142 };
 143 #endif
 144
 145 #define NO_OVERRIDES ARRAY_SIZE(overrides)
 146
 147 static struct base {
 148         unsigned long address;
 149         int noauto;
 150 } bases[] __initdata = {
 151         { 0xcc000, 0 },
 152         { 0xc8000, 0 },
 153         { 0xdc000, 0 },
 154         { 0xd8000, 0 }
 155 };
 156
 157 #define NO_BASES ARRAY_SIZE(bases)
 158
 159 static const struct signature {
 160         const char *string;
 161         int offset;
 162 } signatures[] = {
 163         {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
 164 };
 165
 166 #define NO_SIGNATURES ARRAY_SIZE(signatures)
 167
 168 #ifndef MODULE
 169 /*
 170  * Function : dtc_setup(char *str, int *ints)
 171  *
 172  * Purpose : LILO command line initialization of the overrides array,
 173  *
 174  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 175  *      equal to the number of ints.
 176  *
 177  */
 178
 179 static void __init dtc_setup(char *str, int *ints)
 180 {
 181         static int commandline_current = 0;
 182         int i;
 183         if (ints[0] != 2)
 184                 printk("dtc_setup: usage dtc=address,irq\n");
 185         else if (commandline_current < NO_OVERRIDES) {
 186                 overrides[commandline_current].address = ints[1];
 187                 overrides[commandline_current].irq = ints[2];
 188                 for (i = 0; i < NO_BASES; ++i)
 189                         if (bases[i].address == ints[1]) {
 190                                 bases[i].noauto = 1;
 191                                 break;
 192                         }
 193                 ++commandline_current;
 194         }
 195 }
 196 #endif
 197
 198 /*
 199  * Function : int dtc_detect(struct scsi_host_template * tpnt)
 200  *
 201  * Purpose : detects and initializes DTC 3180/3280 controllers
 202  *      that were autoprobed, overridden on the LILO command line,
 203  *      or specified at compile time.
 204  *
 205  * Inputs : tpnt - template for this SCSI adapter.
 206  *
 207  * Returns : 1 if a host adapter was found, 0 if not.
 208  *
 209 */
 210
 211 static int __init dtc_detect(struct scsi_host_template * tpnt)
 212 {
 213         static int current_override = 0, current_base = 0;
 214         struct Scsi_Host *instance;
 215         unsigned int addr;
 216         void __iomem *base;
 217         int sig, count;
 218
 219         tpnt->proc_name = "dtc3x80";
 220         tpnt->proc_info = &dtc_proc_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, "dtc", instance)) {
 281                                 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 282                                 instance->irq = SCSI_IRQ_NONE;
 283                         }
 284
 285                 if (instance->irq == SCSI_IRQ_NONE) {
 286                         printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 287                         printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 288                 }
 289 #else
 290                 if (instance->irq != SCSI_IRQ_NONE)
 291                         printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
 292                 instance->irq = SCSI_IRQ_NONE;
 293 #endif
 294 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 295                 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
 296 #endif
 297
 298                 printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
 299                 if (instance->irq == SCSI_IRQ_NONE)
 300                         printk(" interrupts disabled");
 301                 else
 302                         printk(" irq %d", instance->irq);
 303                 printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
 304                 NCR5380_print_options(instance);
 305                 printk("\n");
 306
 307                 ++current_override;
 308                 ++count;
 309         }
 310         return count;
 311 }
 312
 313 /*
 314  * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
 315  *
 316  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 317  *      the specified device / size.
 318  *
 319  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 320  *      major / minor, ip[] = {heads, sectors, cylinders}
 321  *
 322  * Returns : always 0 (success), initializes ip
 323  *
 324 */
 325
 326 /*
 327  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 328  * using hard disks on a trantor should verify that this mapping corresponds
 329  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 330  * and matching the H_C_S coordinates to what DOS uses.
 331 */
 332
 333 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
 334                          sector_t capacity, int *ip)
 335 {
 336         int size = capacity;
 337
 338         ip[0] = 64;
 339         ip[1] = 32;
 340         ip[2] = size >> 11;
 341         return 0;
 342 }
 343
 344
 345 /****************************************************************
 346  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 347  *      unsigned char *dst, int len)
 348  *
 349  * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
 350  *      dst
 351  *
 352  * Inputs : dst = destination, len = length in bytes
 353  *
 354  * Returns : 0 on success, non zero on a failure such as a watchdog
 355  *      timeout.
 356 */
 357
 358 static int dtc_maxi = 0;
 359 static int dtc_wmaxi = 0;
 360
 361 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 362 {
 363         unsigned char *d = dst;
 364         int i;                  /* For counting time spent in the poll-loop */
 365         NCR5380_local_declare();
 366         NCR5380_setup(instance);
 367
 368         i = 0;
 369         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 370         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 371         if (instance->irq == SCSI_IRQ_NONE)
 372                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
 373         else
 374                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
 375         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 376         rtrc(1);
 377         while (len > 0) {
 378                 rtrc(2);
 379                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 380                         ++i;
 381                 rtrc(3);
 382                 memcpy_fromio(d, base + DTC_DATA_BUF, 128);
 383                 d += 128;
 384                 len -= 128;
 385                 rtrc(7);
 386                 /*** with int's on, it sometimes hangs after here.
 387                  * Looks like something makes HBNR go away. */
 388         }
 389         rtrc(4);
 390         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 391                 ++i;
 392         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 393         rtrc(0);
 394         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 395         if (i > dtc_maxi)
 396                 dtc_maxi = i;
 397         return (0);
 398 }
 399
 400 /****************************************************************
 401  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 402  *      unsigned char *src, int len)
 403  *
 404  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 405  *      src
 406  *
 407  * Inputs : src = source, len = length in bytes
 408  *
 409  * Returns : 0 on success, non zero on a failure such as a watchdog
 410  *      timeout.
 411 */
 412
 413 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 414 {
 415         int i;
 416         NCR5380_local_declare();
 417         NCR5380_setup(instance);
 418
 419         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 420         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 421         /* set direction (write) */
 422         if (instance->irq == SCSI_IRQ_NONE)
 423                 NCR5380_write(DTC_CONTROL_REG, 0);
 424         else
 425                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
 426         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 427         for (i = 0; len > 0; ++i) {
 428                 rtrc(5);
 429                 /* Poll until the host buffer can accept data. */
 430                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 431                         ++i;
 432                 rtrc(3);
 433                 memcpy_toio(base + DTC_DATA_BUF, src, 128);
 434                 src += 128;
 435                 len -= 128;
 436         }
 437         rtrc(4);
 438         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 439                 ++i;
 440         rtrc(6);
 441         /* Wait until the last byte has been sent to the disk */
 442         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 443                 ++i;
 444         rtrc(7);
 445         /* Check for parity error here. fixme. */
 446         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 447         rtrc(0);
 448         if (i > dtc_wmaxi)
 449                 dtc_wmaxi = i;
 450         return (0);
 451 }
 452
 453 MODULE_LICENSE("GPL");
 454
 455 #include "NCR5380.c"
 456
 457 static int dtc_release(struct Scsi_Host *shost)
 458 {
 459         NCR5380_local_declare();
 460         NCR5380_setup(shost);
 461         if (shost->irq)
 462                 free_irq(shost->irq, NULL);
 463         NCR5380_exit(shost);
 464         if (shost->io_port && shost->n_io_port)
 465                 release_region(shost->io_port, shost->n_io_port);
 466         scsi_unregister(shost);
 467         iounmap(base);
 468         return 0;
 469 }
 470
 471 static struct scsi_host_template driver_template = {
 472         .name                           = "DTC 3180/3280 ",
 473         .detect                         = dtc_detect,
 474         .release                        = dtc_release,
 475         .queuecommand                   = dtc_queue_command,
 476         .eh_abort_handler               = dtc_abort,
 477         .eh_bus_reset_handler           = dtc_bus_reset,
 478         .bios_param                     = dtc_biosparam,
 479         .can_queue                      = CAN_QUEUE,
 480         .this_id                        = 7,
 481         .sg_tablesize                   = SG_ALL,
 482         .cmd_per_lun                    = CMD_PER_LUN,
 483         .use_clustering                 = DISABLE_CLUSTERING,
 484 };
 485 #include "scsi_module.c"