drivers/scsi/dtc.c

   1
   2 #define PSEUDO_DMA
   3 #define DONT_USE_INTR
   4 #define UNSAFE                  /* Leave interrupts enabled during pseudo-dma I/O */
   5 #define DMA_WORKS_RIGHT
   6
   7
   8 /*
   9  * DTC 3180/3280 driver, by
  10  *      Ray Van Tassle  rayvt@comm.mot.com
  11  *
  12  *      taken from ...
  13  *      Trantor T128/T128F/T228 driver by...
  14  *
  15  *      Drew Eckhardt
  16  *      Visionary Computing
  17  *      (Unix and Linux consulting and custom programming)
  18  *      drew@colorado.edu
  19  *      +1 (303) 440-4894
  20  */
  21
  22 /*
  23  * The card is detected and initialized in one of several ways :
  24  * 1.  Autoprobe (default) - since the board is memory mapped,
  25  *     a BIOS signature is scanned for to locate the registers.
  26  *     An interrupt is triggered to autoprobe for the interrupt
  27  *     line.
  28  *
  29  * 2.  With command line overrides - dtc=address,irq may be
  30  *     used on the LILO command line to override the defaults.
  31  *
  32 */
  33
  34 /*----------------------------------------------------------------*/
  35 /* the following will set the monitor border color (useful to find
  36  where something crashed or gets stuck at */
  37 /* 1 = blue
  38  2 = green
  39  3 = cyan
  40  4 = red
  41  5 = magenta
  42  6 = yellow
  43  7 = white
  44 */
  45 #if 0
  46 #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
  47 #else
  48 #define rtrc(i) {}
  49 #endif
  50
  51
  52 #include <linux/module.h>
  53 #include <linux/signal.h>
  54 #include <linux/blkdev.h>
  55 #include <linux/delay.h>
  56 #include <linux/stat.h>
  57 #include <linux/string.h>
  58 #include <linux/init.h>
  59 #include <linux/interrupt.h>
  60 #include <linux/io.h>
  61 #include <scsi/scsi_host.h>
  62 #include "dtc.h"
  63 #define AUTOPROBE_IRQ
  64 #include "NCR5380.h"
  65
  66 /*
  67  * The DTC3180 & 3280 boards are memory mapped.
  68  *
  69  */
  70
  71 /*
  72  */
  73 /* Offset from DTC_5380_OFFSET */
  74 #define DTC_CONTROL_REG         0x100   /* rw */
  75 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
  76 #define CSR_DIR_READ            0x40    /* rw direction, 1 = read 0 = write */
  77
  78 #define CSR_RESET              0x80     /* wo  Resets 53c400 */
  79 #define CSR_5380_REG           0x80     /* ro  5380 registers can be accessed */
  80 #define CSR_TRANS_DIR          0x40     /* rw  Data transfer direction */
  81 #define CSR_SCSI_BUFF_INTR     0x20     /* rw  Enable int on transfer ready */
  82 #define CSR_5380_INTR          0x10     /* rw  Enable 5380 interrupts */
  83 #define CSR_SHARED_INTR        0x08     /* rw  Interrupt sharing */
  84 #define CSR_HOST_BUF_NOT_RDY   0x04     /* ro  Host buffer not ready */
  85 #define CSR_SCSI_BUF_RDY       0x02     /* ro  SCSI buffer ready */
  86 #define CSR_GATED_5380_IRQ     0x01     /* ro  Last block xferred */
  87 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
  88
  89
  90 #define DTC_BLK_CNT             0x101   /* rw
  91                                          * # of 128-byte blocks to transfer */
  92
  93
  94 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
  95
  96 #define DTC_SWITCH_REG          0x3982  /* ro - DIP switches */
  97 #define DTC_RESUME_XFER         0x3982  /* wo - resume data xfer
  98                                          * after disconnect/reconnect*/
  99
 100 #define DTC_5380_OFFSET         0x3880  /* 8 registers here, see NCR5380.h */
 101
 102 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
 103 #define DTC_DATA_BUF            0x3900  /* rw 128 bytes long */
 104
 105 static struct override {
 106         unsigned int address;
 107         int irq;
 108 } overrides
 109 #ifdef OVERRIDE
 110 [] __initdata = OVERRIDE;
 111 #else
 112 [4] __initdata = {
 113         { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
 114 };
 115 #endif
 116
 117 #define NO_OVERRIDES ARRAY_SIZE(overrides)
 118
 119 static struct base {
 120         unsigned long address;
 121         int noauto;
 122 } bases[] __initdata = {
 123         { 0xcc000, 0 },
 124         { 0xc8000, 0 },
 125         { 0xdc000, 0 },
 126         { 0xd8000, 0 }
 127 };
 128
 129 #define NO_BASES ARRAY_SIZE(bases)
 130
 131 static const struct signature {
 132         const char *string;
 133         int offset;
 134 } signatures[] = {
 135         {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
 136 };
 137
 138 #define NO_SIGNATURES ARRAY_SIZE(signatures)
 139
 140 #ifndef MODULE
 141 /*
 142  * Function : dtc_setup(char *str, int *ints)
 143  *
 144  * Purpose : LILO command line initialization of the overrides array,
 145  *
 146  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 147  *      equal to the number of ints.
 148  *
 149  */
 150
 151 static int __init dtc_setup(char *str)
 152 {
 153         static int commandline_current = 0;
 154         int i;
 155         int ints[10];
 156
 157         get_options(str, ARRAY_SIZE(ints), ints);
 158         if (ints[0] != 2)
 159                 printk("dtc_setup: usage dtc=address,irq\n");
 160         else if (commandline_current < NO_OVERRIDES) {
 161                 overrides[commandline_current].address = ints[1];
 162                 overrides[commandline_current].irq = ints[2];
 163                 for (i = 0; i < NO_BASES; ++i)
 164                         if (bases[i].address == ints[1]) {
 165                                 bases[i].noauto = 1;
 166                                 break;
 167                         }
 168                 ++commandline_current;
 169         }
 170         return 1;
 171 }
 172
 173 __setup("dtc=", dtc_setup);
 174 #endif
 175
 176 /*
 177  * Function : int dtc_detect(struct scsi_host_template * tpnt)
 178  *
 179  * Purpose : detects and initializes DTC 3180/3280 controllers
 180  *      that were autoprobed, overridden on the LILO command line,
 181  *      or specified at compile time.
 182  *
 183  * Inputs : tpnt - template for this SCSI adapter.
 184  *
 185  * Returns : 1 if a host adapter was found, 0 if not.
 186  *
 187 */
 188
 189 static int __init dtc_detect(struct scsi_host_template * tpnt)
 190 {
 191         static int current_override = 0, current_base = 0;
 192         struct Scsi_Host *instance;
 193         unsigned int addr;
 194         void __iomem *base;
 195         int sig, count;
 196
 197         for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 198                 addr = 0;
 199                 base = NULL;
 200
 201                 if (overrides[current_override].address) {
 202                         addr = overrides[current_override].address;
 203                         base = ioremap(addr, 0x2000);
 204                         if (!base)
 205                                 addr = 0;
 206                 } else
 207                         for (; !addr && (current_base < NO_BASES); ++current_base) {
 208 #if (DTCDEBUG & DTCDEBUG_INIT)
 209                                 printk(KERN_DEBUG "scsi-dtc : probing address %08x\n", bases[current_base].address);
 210 #endif
 211                                 if (bases[current_base].noauto)
 212                                         continue;
 213                                 base = ioremap(bases[current_base].address, 0x2000);
 214                                 if (!base)
 215                                         continue;
 216                                 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
 217                                         if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
 218                                                 addr = bases[current_base].address;
 219 #if (DTCDEBUG & DTCDEBUG_INIT)
 220                                                 printk(KERN_DEBUG "scsi-dtc : detected board.\n");
 221 #endif
 222                                                 goto found;
 223                                         }
 224                                 }
 225                                 iounmap(base);
 226                         }
 227
 228 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 229                 printk(KERN_DEBUG "scsi-dtc : base = %08x\n", addr);
 230 #endif
 231
 232                 if (!addr)
 233                         break;
 234
 235 found:
 236                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 237                 if (instance == NULL)
 238                         break;
 239
 240                 instance->base = addr;
 241                 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
 242
 243                 NCR5380_init(instance, 0);
 244
 245                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);  /* Enable int's */
 246                 if (overrides[current_override].irq != IRQ_AUTO)
 247                         instance->irq = overrides[current_override].irq;
 248                 else
 249                         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
 250
 251                 /* Compatibility with documented NCR5380 kernel parameters */
 252                 if (instance->irq == 255)
 253                         instance->irq = NO_IRQ;
 254
 255 #ifndef DONT_USE_INTR
 256                 /* With interrupts enabled, it will sometimes hang when doing heavy
 257                  * reads. So better not enable them until I finger it out. */
 258                 if (instance->irq != NO_IRQ)
 259                         if (request_irq(instance->irq, dtc_intr, 0,
 260                                         "dtc", instance)) {
 261                                 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 262                                 instance->irq = NO_IRQ;
 263                         }
 264
 265                 if (instance->irq == NO_IRQ) {
 266                         printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 267                         printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 268                 }
 269 #else
 270                 if (instance->irq != NO_IRQ)
 271                         printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
 272                 instance->irq = NO_IRQ;
 273 #endif
 274 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 275                 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
 276 #endif
 277
 278                 ++current_override;
 279                 ++count;
 280         }
 281         return count;
 282 }
 283
 284 /*
 285  * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
 286  *
 287  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 288  *      the specified device / size.
 289  *
 290  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 291  *      major / minor, ip[] = {heads, sectors, cylinders}
 292  *
 293  * Returns : always 0 (success), initializes ip
 294  *
 295 */
 296
 297 /*
 298  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 299  * using hard disks on a trantor should verify that this mapping corresponds
 300  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 301  * and matching the H_C_S coordinates to what DOS uses.
 302 */
 303
 304 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
 305                          sector_t capacity, int *ip)
 306 {
 307         int size = capacity;
 308
 309         ip[0] = 64;
 310         ip[1] = 32;
 311         ip[2] = size >> 11;
 312         return 0;
 313 }
 314
 315
 316 /****************************************************************
 317  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 318  *      unsigned char *dst, int len)
 319  *
 320  * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
 321  *      dst
 322  *
 323  * Inputs : dst = destination, len = length in bytes
 324  *
 325  * Returns : 0 on success, non zero on a failure such as a watchdog
 326  *      timeout.
 327 */
 328
 329 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 330 {
 331         unsigned char *d = dst;
 332         int i;                  /* For counting time spent in the poll-loop */
 333         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 334         NCR5380_local_declare();
 335         NCR5380_setup(instance);
 336
 337         i = 0;
 338         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 339         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 340         if (instance->irq == NO_IRQ)
 341                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
 342         else
 343                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
 344         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 345         rtrc(1);
 346         while (len > 0) {
 347                 rtrc(2);
 348                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 349                         ++i;
 350                 rtrc(3);
 351                 memcpy_fromio(d, base + DTC_DATA_BUF, 128);
 352                 d += 128;
 353                 len -= 128;
 354                 rtrc(7);
 355                 /*** with int's on, it sometimes hangs after here.
 356                  * Looks like something makes HBNR go away. */
 357         }
 358         rtrc(4);
 359         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 360                 ++i;
 361         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 362         rtrc(0);
 363         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 364         if (i > hostdata->spin_max_r)
 365                 hostdata->spin_max_r = i;
 366         return (0);
 367 }
 368
 369 /****************************************************************
 370  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 371  *      unsigned char *src, int len)
 372  *
 373  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 374  *      src
 375  *
 376  * Inputs : src = source, len = length in bytes
 377  *
 378  * Returns : 0 on success, non zero on a failure such as a watchdog
 379  *      timeout.
 380 */
 381
 382 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 383 {
 384         int i;
 385         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 386         NCR5380_local_declare();
 387         NCR5380_setup(instance);
 388
 389         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 390         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 391         /* set direction (write) */
 392         if (instance->irq == NO_IRQ)
 393                 NCR5380_write(DTC_CONTROL_REG, 0);
 394         else
 395                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
 396         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 397         for (i = 0; len > 0; ++i) {
 398                 rtrc(5);
 399                 /* Poll until the host buffer can accept data. */
 400                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 401                         ++i;
 402                 rtrc(3);
 403                 memcpy_toio(base + DTC_DATA_BUF, src, 128);
 404                 src += 128;
 405                 len -= 128;
 406         }
 407         rtrc(4);
 408         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 409                 ++i;
 410         rtrc(6);
 411         /* Wait until the last byte has been sent to the disk */
 412         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 413                 ++i;
 414         rtrc(7);
 415         /* Check for parity error here. fixme. */
 416         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 417         rtrc(0);
 418         if (i > hostdata->spin_max_w)
 419                 hostdata->spin_max_w = i;
 420         return (0);
 421 }
 422
 423 MODULE_LICENSE("GPL");
 424
 425 #include "NCR5380.c"
 426
 427 static int dtc_release(struct Scsi_Host *shost)
 428 {
 429         NCR5380_local_declare();
 430         NCR5380_setup(shost);
 431         if (shost->irq != NO_IRQ)
 432                 free_irq(shost->irq, shost);
 433         NCR5380_exit(shost);
 434         if (shost->io_port && shost->n_io_port)
 435                 release_region(shost->io_port, shost->n_io_port);
 436         scsi_unregister(shost);
 437         iounmap(base);
 438         return 0;
 439 }
 440
 441 static struct scsi_host_template driver_template = {
 442         .name                           = "DTC 3180/3280 ",
 443         .detect                         = dtc_detect,
 444         .release                        = dtc_release,
 445         .proc_name                      = "dtc3x80",
 446         .show_info                      = dtc_show_info,
 447         .write_info                     = dtc_write_info,
 448         .info                           = dtc_info,
 449         .queuecommand                   = dtc_queue_command,
 450         .eh_abort_handler               = dtc_abort,
 451         .eh_bus_reset_handler           = dtc_bus_reset,
 452         .bios_param                     = dtc_biosparam,
 453         .can_queue                      = CAN_QUEUE,
 454         .this_id                        = 7,
 455         .sg_tablesize                   = SG_ALL,
 456         .cmd_per_lun                    = CMD_PER_LUN,
 457         .use_clustering                 = DISABLE_CLUSTERING,
 458 };
 459 #include "scsi_module.c"