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 <asm/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 /*#define DTCDEBUG 0x1*/
  96 #define DTCDEBUG_INIT   0x1
  97 #define DTCDEBUG_TRANSFER 0x2
  98
  99 /*
 100  * The DTC3180 & 3280 boards are memory mapped.
 101  *
 102  */
 103
 104 /*
 105  */
 106 /* Offset from DTC_5380_OFFSET */
 107 #define DTC_CONTROL_REG         0x100   /* rw */
 108 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
 109 #define CSR_DIR_READ            0x40    /* rw direction, 1 = read 0 = write */
 110
 111 #define CSR_RESET              0x80     /* wo  Resets 53c400 */
 112 #define CSR_5380_REG           0x80     /* ro  5380 registers can be accessed */
 113 #define CSR_TRANS_DIR          0x40     /* rw  Data transfer direction */
 114 #define CSR_SCSI_BUFF_INTR     0x20     /* rw  Enable int on transfer ready */
 115 #define CSR_5380_INTR          0x10     /* rw  Enable 5380 interrupts */
 116 #define CSR_SHARED_INTR        0x08     /* rw  Interrupt sharing */
 117 #define CSR_HOST_BUF_NOT_RDY   0x04     /* ro  Host buffer not ready */
 118 #define CSR_SCSI_BUF_RDY       0x02     /* ro  SCSI buffer ready */
 119 #define CSR_GATED_5380_IRQ     0x01     /* ro  Last block xferred */
 120 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
 121
 122
 123 #define DTC_BLK_CNT             0x101   /* rw
 124                                          * # of 128-byte blocks to transfer */
 125
 126
 127 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
 128
 129 #define DTC_SWITCH_REG          0x3982  /* ro - DIP switches */
 130 #define DTC_RESUME_XFER         0x3982  /* wo - resume data xfer
 131                                          * after disconnect/reconnect*/
 132
 133 #define DTC_5380_OFFSET         0x3880  /* 8 registers here, see NCR5380.h */
 134
 135 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
 136 #define DTC_DATA_BUF            0x3900  /* rw 128 bytes long */
 137
 138 static struct override {
 139         unsigned int address;
 140         int irq;
 141 } overrides
 142 #ifdef OVERRIDE
 143 [] __initdata = OVERRIDE;
 144 #else
 145 [4] __initdata = { {
 146 0, IRQ_AUTO}, {
 147 0, IRQ_AUTO}, {
 148 0, IRQ_AUTO}, {
 149 0, IRQ_AUTO}};
 150 #endif
 151
 152 #define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
 153
 154 static struct base {
 155         unsigned long address;
 156         int noauto;
 157 } bases[] __initdata = {
 158         { 0xcc000, 0 },
 159         { 0xc8000, 0 },
 160         { 0xdc000, 0 },
 161         { 0xd8000, 0 }
 162 };
 163
 164 #define NO_BASES (sizeof (bases) / sizeof (struct base))
 165
 166 static const struct signature {
 167         const char *string;
 168         int offset;
 169 } signatures[] = {
 170         {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
 171 };
 172
 173 #define NO_SIGNATURES (sizeof (signatures) /  sizeof (struct signature))
 174
 175 #ifndef MODULE
 176 /*
 177  * Function : dtc_setup(char *str, int *ints)
 178  *
 179  * Purpose : LILO command line initialization of the overrides array,
 180  *
 181  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 182  *      equal to the number of ints.
 183  *
 184 */
 185
 186 static void __init dtc_setup(char *str, int *ints)
 187 {
 188         static int commandline_current = 0;
 189         int i;
 190         if (ints[0] != 2)
 191                 printk("dtc_setup: usage dtc=address,irq\n");
 192         else if (commandline_current < NO_OVERRIDES) {
 193                 overrides[commandline_current].address = ints[1];
 194                 overrides[commandline_current].irq = ints[2];
 195                 for (i = 0; i < NO_BASES; ++i)
 196                         if (bases[i].address == ints[1]) {
 197                                 bases[i].noauto = 1;
 198                                 break;
 199                         }
 200                 ++commandline_current;
 201         }
 202 }
 203 #endif
 204
 205 /*
 206  * Function : int dtc_detect(Scsi_Host_Template * tpnt)
 207  *
 208  * Purpose : detects and initializes DTC 3180/3280 controllers
 209  *      that were autoprobed, overridden on the LILO command line,
 210  *      or specified at compile time.
 211  *
 212  * Inputs : tpnt - template for this SCSI adapter.
 213  *
 214  * Returns : 1 if a host adapter was found, 0 if not.
 215  *
 216 */
 217
 218 static int __init dtc_detect(Scsi_Host_Template * tpnt)
 219 {
 220         static int current_override = 0, current_base = 0;
 221         struct Scsi_Host *instance;
 222         unsigned int base;
 223         int sig, count;
 224
 225         tpnt->proc_name = "dtc3x80";
 226         tpnt->proc_info = &dtc_proc_info;
 227
 228         for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 229                 base = 0;
 230
 231                 if (overrides[current_override].address)
 232                         base = overrides[current_override].address;
 233                 else
 234                         for (; !base && (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                                 for (sig = 0; sig < NO_SIGNATURES; ++sig)
 239                                         if (!bases[current_base].noauto && isa_check_signature(bases[current_base].address + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
 240                                                 base = bases[current_base].address;
 241 #if (DTCDEBUG & DTCDEBUG_INIT)
 242                                                 printk("scsi-dtc : detected board.\n");
 243 #endif
 244                                                 break;
 245                                         }
 246                         }
 247
 248 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 249                 printk("scsi-dtc : base = %08x\n", base);
 250 #endif
 251
 252                 if (!base)
 253                         break;
 254
 255                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 256                 if (instance == NULL)
 257                         break;
 258
 259                 instance->base = base;
 260
 261                 NCR5380_init(instance, 0);
 262
 263                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);  /* Enable int's */
 264                 if (overrides[current_override].irq != IRQ_AUTO)
 265                         instance->irq = overrides[current_override].irq;
 266                 else
 267                         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
 268
 269 #ifndef DONT_USE_INTR
 270                 /* With interrupts enabled, it will sometimes hang when doing heavy
 271                  * reads. So better not enable them until I finger it out. */
 272                 if (instance->irq != SCSI_IRQ_NONE)
 273                         if (request_irq(instance->irq, dtc_intr, SA_INTERRUPT, "dtc", instance)) {
 274                                 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 275                                 instance->irq = SCSI_IRQ_NONE;
 276                         }
 277
 278                 if (instance->irq == SCSI_IRQ_NONE) {
 279                         printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 280                         printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 281                 }
 282 #else
 283                 if (instance->irq != SCSI_IRQ_NONE)
 284                         printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
 285                 instance->irq = SCSI_IRQ_NONE;
 286 #endif
 287 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 288                 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
 289 #endif
 290
 291                 printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
 292                 if (instance->irq == SCSI_IRQ_NONE)
 293                         printk(" interrupts disabled");
 294                 else
 295                         printk(" irq %d", instance->irq);
 296                 printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
 297                 NCR5380_print_options(instance);
 298                 printk("\n");
 299
 300                 ++current_override;
 301                 ++count;
 302         }
 303         return count;
 304 }
 305
 306 /*
 307  * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
 308  *
 309  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 310  *      the specified device / size.
 311  *
 312  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 313  *      major / minor, ip[] = {heads, sectors, cylinders}
 314  *
 315  * Returns : always 0 (success), initializes ip
 316  *
 317 */
 318
 319 /*
 320  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 321  * using hard disks on a trantor should verify that this mapping corresponds
 322  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 323  * and matching the H_C_S coordinates to what DOS uses.
 324 */
 325
 326 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
 327                          sector_t capacity, int *ip)
 328 {
 329         int size = capacity;
 330
 331         ip[0] = 64;
 332         ip[1] = 32;
 333         ip[2] = size >> 11;
 334         return 0;
 335 }
 336
 337
 338 /****************************************************************
 339  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 340  *      unsigned char *dst, int len)
 341  *
 342  * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
 343  *      dst
 344  *
 345  * Inputs : dst = destination, len = length in bytes
 346  *
 347  * Returns : 0 on success, non zero on a failure such as a watchdog
 348  *      timeout.
 349 */
 350
 351 static int dtc_maxi = 0;
 352 static int dtc_wmaxi = 0;
 353
 354 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 355 {
 356         unsigned char *d = dst;
 357         int i;                  /* For counting time spent in the poll-loop */
 358         NCR5380_local_declare();
 359         NCR5380_setup(instance);
 360
 361         i = 0;
 362         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 363         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 364         if (instance->irq == SCSI_IRQ_NONE)
 365                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
 366         else
 367                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
 368         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 369         rtrc(1);
 370         while (len > 0) {
 371                 rtrc(2);
 372                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 373                         ++i;
 374                 rtrc(3);
 375                 isa_memcpy_fromio(d, base + DTC_DATA_BUF, 128);
 376                 d += 128;
 377                 len -= 128;
 378                 rtrc(7);
 379                 /*** with int's on, it sometimes hangs after here.
 380                  * Looks like something makes HBNR go away. */
 381         }
 382         rtrc(4);
 383         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 384                 ++i;
 385         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 386         rtrc(0);
 387         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 388         if (i > dtc_maxi)
 389                 dtc_maxi = i;
 390         return (0);
 391 }
 392
 393 /****************************************************************
 394  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 395  *      unsigned char *src, int len)
 396  *
 397  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 398  *      src
 399  *
 400  * Inputs : src = source, len = length in bytes
 401  *
 402  * Returns : 0 on success, non zero on a failure such as a watchdog
 403  *      timeout.
 404 */
 405
 406 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 407 {
 408         int i;
 409         NCR5380_local_declare();
 410         NCR5380_setup(instance);
 411
 412         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 413         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 414         /* set direction (write) */
 415         if (instance->irq == SCSI_IRQ_NONE)
 416                 NCR5380_write(DTC_CONTROL_REG, 0);
 417         else
 418                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
 419         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 420         for (i = 0; len > 0; ++i) {
 421                 rtrc(5);
 422                 /* Poll until the host buffer can accept data. */
 423                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 424                         ++i;
 425                 rtrc(3);
 426                 isa_memcpy_toio(base + DTC_DATA_BUF, src, 128);
 427                 src += 128;
 428                 len -= 128;
 429         }
 430         rtrc(4);
 431         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 432                 ++i;
 433         rtrc(6);
 434         /* Wait until the last byte has been sent to the disk */
 435         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 436                 ++i;
 437         rtrc(7);
 438         /* Check for parity error here. fixme. */
 439         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 440         rtrc(0);
 441         if (i > dtc_wmaxi)
 442                 dtc_wmaxi = i;
 443         return (0);
 444 }
 445
 446 MODULE_LICENSE("GPL");
 447
 448 #include "NCR5380.c"
 449
 450 static int dtc_release(struct Scsi_Host *shost)
 451 {
 452         if (shost->irq)
 453                 free_irq(shost->irq, NULL);
 454         NCR5380_exit(shost);
 455         if (shost->io_port && shost->n_io_port)
 456                 release_region(shost->io_port, shost->n_io_port);
 457         scsi_unregister(shost);
 458         return 0;
 459 }
 460
 461 static Scsi_Host_Template driver_template = {
 462         .name                           = "DTC 3180/3280 ",
 463         .detect                         = dtc_detect,
 464         .release                        = dtc_release,
 465         .queuecommand                   = dtc_queue_command,
 466         .eh_abort_handler               = dtc_abort,
 467         .eh_bus_reset_handler           = dtc_bus_reset,
 468         .eh_device_reset_handler        = dtc_device_reset,
 469         .eh_host_reset_handler          = dtc_host_reset,
 470         .bios_param                     = dtc_biosparam,
 471         .can_queue                      = CAN_QUEUE,
 472         .this_id                        = 7,
 473         .sg_tablesize                   = SG_ALL,
 474         .cmd_per_lun                    = CMD_PER_LUN,
 475         .use_clustering                 = DISABLE_CLUSTERING,
 476 };
 477 #include "scsi_module.c"