release/src-rt-6.x.4708/linux/linux-2.6.36/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 #define rtrc(i) {}
  69
  70
  71 #include <asm/system.h>
  72 #include <linux/module.h>
  73 #include <linux/signal.h>
  74 #include <linux/blkdev.h>
  75 #include <linux/delay.h>
  76 #include <linux/stat.h>
  77 #include <linux/string.h>
  78 #include <linux/init.h>
  79 #include <linux/interrupt.h>
  80 #include <linux/io.h>
  81 #include "scsi.h"
  82 #include <scsi/scsi_host.h>
  83 #include "dtc.h"
  84 #define AUTOPROBE_IRQ
  85 #include "NCR5380.h"
  86
  87
  88 #define DTC_PUBLIC_RELEASE 2
  89
  90 /*
  91  * The DTC3180 & 3280 boards are memory mapped.
  92  *
  93  */
  94
  95 /*
  96  */
  97 /* Offset from DTC_5380_OFFSET */
  98 #define DTC_CONTROL_REG         0x100   /* rw */
  99 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
 100 #define CSR_DIR_READ            0x40    /* rw direction, 1 = read 0 = write */
 101
 102 #define CSR_RESET              0x80     /* wo  Resets 53c400 */
 103 #define CSR_5380_REG           0x80     /* ro  5380 registers can be accessed */
 104 #define CSR_TRANS_DIR          0x40     /* rw  Data transfer direction */
 105 #define CSR_SCSI_BUFF_INTR     0x20     /* rw  Enable int on transfer ready */
 106 #define CSR_5380_INTR          0x10     /* rw  Enable 5380 interrupts */
 107 #define CSR_SHARED_INTR        0x08     /* rw  Interrupt sharing */
 108 #define CSR_HOST_BUF_NOT_RDY   0x04     /* ro  Host buffer not ready */
 109 #define CSR_SCSI_BUF_RDY       0x02     /* ro  SCSI buffer ready */
 110 #define CSR_GATED_5380_IRQ     0x01     /* ro  Last block xferred */
 111 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
 112
 113
 114 #define DTC_BLK_CNT             0x101   /* rw
 115                                          * # of 128-byte blocks to transfer */
 116
 117
 118 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
 119
 120 #define DTC_SWITCH_REG          0x3982  /* ro - DIP switches */
 121 #define DTC_RESUME_XFER         0x3982  /* wo - resume data xfer
 122                                          * after disconnect/reconnect*/
 123
 124 #define DTC_5380_OFFSET         0x3880  /* 8 registers here, see NCR5380.h */
 125
 126 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
 127 #define DTC_DATA_BUF            0x3900  /* rw 128 bytes long */
 128
 129 static struct override {
 130         unsigned int address;
 131         int irq;
 132 } overrides
 133 #ifdef OVERRIDE
 134 [] __initdata = OVERRIDE;
 135 #else
 136 [4] __initdata = {
 137         { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
 138 };
 139 #endif
 140
 141 #define NO_OVERRIDES ARRAY_SIZE(overrides)
 142
 143 static struct base {
 144         unsigned long address;
 145         int noauto;
 146 } bases[] __initdata = {
 147         { 0xcc000, 0 },
 148         { 0xc8000, 0 },
 149         { 0xdc000, 0 },
 150         { 0xd8000, 0 }
 151 };
 152
 153 #define NO_BASES ARRAY_SIZE(bases)
 154
 155 static const struct signature {
 156         const char *string;
 157         int offset;
 158 } signatures[] = {
 159         {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
 160 };
 161
 162 #define NO_SIGNATURES ARRAY_SIZE(signatures)
 163
 164 #ifndef MODULE
 165 /*
 166  * Function : dtc_setup(char *str, int *ints)
 167  *
 168  * Purpose : LILO command line initialization of the overrides array,
 169  *
 170  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 171  *      equal to the number of ints.
 172  *
 173  */
 174
 175 static void __init dtc_setup(char *str, int *ints)
 176 {
 177         static int commandline_current = 0;
 178         int i;
 179         if (ints[0] != 2)
 180                 printk("dtc_setup: usage dtc=address,irq\n");
 181         else if (commandline_current < NO_OVERRIDES) {
 182                 overrides[commandline_current].address = ints[1];
 183                 overrides[commandline_current].irq = ints[2];
 184                 for (i = 0; i < NO_BASES; ++i)
 185                         if (bases[i].address == ints[1]) {
 186                                 bases[i].noauto = 1;
 187                                 break;
 188                         }
 189                 ++commandline_current;
 190         }
 191 }
 192 #endif
 193
 194 /*
 195  * Function : int dtc_detect(struct scsi_host_template * tpnt)
 196  *
 197  * Purpose : detects and initializes DTC 3180/3280 controllers
 198  *      that were autoprobed, overridden on the LILO command line,
 199  *      or specified at compile time.
 200  *
 201  * Inputs : tpnt - template for this SCSI adapter.
 202  *
 203  * Returns : 1 if a host adapter was found, 0 if not.
 204  *
 205 */
 206
 207 static int __init dtc_detect(struct scsi_host_template * tpnt)
 208 {
 209         static int current_override = 0, current_base = 0;
 210         struct Scsi_Host *instance;
 211         unsigned int addr;
 212         void __iomem *base;
 213         int sig, count;
 214
 215         tpnt->proc_name = "dtc3x80";
 216         tpnt->proc_info = &dtc_proc_info;
 217
 218         for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 219                 addr = 0;
 220                 base = NULL;
 221
 222                 if (overrides[current_override].address) {
 223                         addr = overrides[current_override].address;
 224                         base = ioremap(addr, 0x2000);
 225                         if (!base)
 226                                 addr = 0;
 227                 } else
 228                         for (; !addr && (current_base < NO_BASES); ++current_base) {
 229 #if (DTCDEBUG & DTCDEBUG_INIT)
 230                                 printk(KERN_DEBUG "scsi-dtc : probing address %08x\n", bases[current_base].address);
 231 #endif
 232                                 if (bases[current_base].noauto)
 233                                         continue;
 234                                 base = ioremap(bases[current_base].address, 0x2000);
 235                                 if (!base)
 236                                         continue;
 237                                 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
 238                                         if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
 239                                                 addr = bases[current_base].address;
 240 #if (DTCDEBUG & DTCDEBUG_INIT)
 241                                                 printk(KERN_DEBUG "scsi-dtc : detected board.\n");
 242 #endif
 243                                                 goto found;
 244                                         }
 245                                 }
 246                                 iounmap(base);
 247                         }
 248
 249 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 250                 printk(KERN_DEBUG "scsi-dtc : base = %08x\n", addr);
 251 #endif
 252
 253                 if (!addr)
 254                         break;
 255
 256 found:
 257                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 258                 if (instance == NULL)
 259                         break;
 260
 261                 instance->base = addr;
 262                 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
 263
 264                 NCR5380_init(instance, 0);
 265
 266                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);  /* Enable int's */
 267                 if (overrides[current_override].irq != IRQ_AUTO)
 268                         instance->irq = overrides[current_override].irq;
 269                 else
 270                         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
 271
 272 #ifndef DONT_USE_INTR
 273                 /* With interrupts enabled, it will sometimes hang when doing heavy
 274                  * reads. So better not enable them until I finger it out. */
 275                 if (instance->irq != SCSI_IRQ_NONE)
 276                         if (request_irq(instance->irq, dtc_intr, IRQF_DISABLED,
 277                                         "dtc", instance)) {
 278                                 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 279                                 instance->irq = SCSI_IRQ_NONE;
 280                         }
 281
 282                 if (instance->irq == SCSI_IRQ_NONE) {
 283                         printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 284                         printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 285                 }
 286 #else
 287                 if (instance->irq != SCSI_IRQ_NONE)
 288                         printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
 289                 instance->irq = SCSI_IRQ_NONE;
 290 #endif
 291 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 292                 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
 293 #endif
 294
 295                 printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
 296                 if (instance->irq == SCSI_IRQ_NONE)
 297                         printk(" interrupts disabled");
 298                 else
 299                         printk(" irq %d", instance->irq);
 300                 printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
 301                 NCR5380_print_options(instance);
 302                 printk("\n");
 303
 304                 ++current_override;
 305                 ++count;
 306         }
 307         return count;
 308 }
 309
 310 /*
 311  * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
 312  *
 313  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 314  *      the specified device / size.
 315  *
 316  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 317  *      major / minor, ip[] = {heads, sectors, cylinders}
 318  *
 319  * Returns : always 0 (success), initializes ip
 320  *
 321 */
 322
 323
 324 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
 325                          sector_t capacity, int *ip)
 326 {
 327         int size = capacity;
 328
 329         ip[0] = 64;
 330         ip[1] = 32;
 331         ip[2] = size >> 11;
 332         return 0;
 333 }
 334
 335
 336 /****************************************************************
 337  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 338  *      unsigned char *dst, int len)
 339  *
 340  * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
 341  *      dst
 342  *
 343  * Inputs : dst = destination, len = length in bytes
 344  *
 345  * Returns : 0 on success, non zero on a failure such as a watchdog
 346  *      timeout.
 347 */
 348
 349 static int dtc_maxi = 0;
 350 static int dtc_wmaxi = 0;
 351
 352 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 353 {
 354         unsigned char *d = dst;
 355         int i;                  /* For counting time spent in the poll-loop */
 356         NCR5380_local_declare();
 357         NCR5380_setup(instance);
 358
 359         i = 0;
 360         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 361         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 362         if (instance->irq == SCSI_IRQ_NONE)
 363                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
 364         else
 365                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
 366         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 367         rtrc(1);
 368         while (len > 0) {
 369                 rtrc(2);
 370                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 371                         ++i;
 372                 rtrc(3);
 373                 memcpy_fromio(d, base + DTC_DATA_BUF, 128);
 374                 d += 128;
 375                 len -= 128;
 376                 rtrc(7);
 377                 /*** with int's on, it sometimes hangs after here.
 378                  * Looks like something makes HBNR go away. */
 379         }
 380         rtrc(4);
 381         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 382                 ++i;
 383         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 384         rtrc(0);
 385         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 386         if (i > dtc_maxi)
 387                 dtc_maxi = i;
 388         return (0);
 389 }
 390
 391 /****************************************************************
 392  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 393  *      unsigned char *src, int len)
 394  *
 395  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 396  *      src
 397  *
 398  * Inputs : src = source, len = length in bytes
 399  *
 400  * Returns : 0 on success, non zero on a failure such as a watchdog
 401  *      timeout.
 402 */
 403
 404 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 405 {
 406         int i;
 407         NCR5380_local_declare();
 408         NCR5380_setup(instance);
 409
 410         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 411         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 412         /* set direction (write) */
 413         if (instance->irq == SCSI_IRQ_NONE)
 414                 NCR5380_write(DTC_CONTROL_REG, 0);
 415         else
 416                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
 417         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 418         for (i = 0; len > 0; ++i) {
 419                 rtrc(5);
 420                 /* Poll until the host buffer can accept data. */
 421                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 422                         ++i;
 423                 rtrc(3);
 424                 memcpy_toio(base + DTC_DATA_BUF, src, 128);
 425                 src += 128;
 426                 len -= 128;
 427         }
 428         rtrc(4);
 429         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 430                 ++i;
 431         rtrc(6);
 432         /* Wait until the last byte has been sent to the disk */
 433         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 434                 ++i;
 435         rtrc(7);
 436         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 437         rtrc(0);
 438         if (i > dtc_wmaxi)
 439                 dtc_wmaxi = i;
 440         return (0);
 441 }
 442
 443 MODULE_LICENSE("GPL");
 444
 445 #include "NCR5380.c"
 446
 447 static int dtc_release(struct Scsi_Host *shost)
 448 {
 449         NCR5380_local_declare();
 450         NCR5380_setup(shost);
 451         if (shost->irq)
 452                 free_irq(shost->irq, shost);
 453         NCR5380_exit(shost);
 454         if (shost->io_port && shost->n_io_port)
 455                 release_region(shost->io_port, shost->n_io_port);
 456         scsi_unregister(shost);
 457         iounmap(base);
 458         return 0;
 459 }
 460
 461 static struct 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         .bios_param                     = dtc_biosparam,
 469         .can_queue                      = CAN_QUEUE,
 470         .this_id                        = 7,
 471         .sg_tablesize                   = SG_ALL,
 472         .cmd_per_lun                    = CMD_PER_LUN,
 473         .use_clustering                 = DISABLE_CLUSTERING,
 474 };
 475 #include "scsi_module.c"