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;
 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, current_base;
 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                                 dprintk(NDEBUG_INIT, "dtc: probing address 0x%08x\n",
 209                                         (unsigned int)bases[current_base].address);
 210                                 if (bases[current_base].noauto)
 211                                         continue;
 212                                 base = ioremap(bases[current_base].address, 0x2000);
 213                                 if (!base)
 214                                         continue;
 215                                 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
 216                                         if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
 217                                                 addr = bases[current_base].address;
 218                                                 dprintk(NDEBUG_INIT, "dtc: detected board\n");
 219                                                 goto found;
 220                                         }
 221                                 }
 222                                 iounmap(base);
 223                         }
 224
 225                 dprintk(NDEBUG_INIT, "dtc: addr = 0x%08x\n", addr);
 226
 227                 if (!addr)
 228                         break;
 229
 230 found:
 231                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 232                 if (instance == NULL)
 233                         goto out_unmap;
 234
 235                 instance->base = addr;
 236                 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
 237
 238                 if (NCR5380_init(instance, 0))
 239                         goto out_unregister;
 240
 241                 NCR5380_maybe_reset_bus(instance);
 242
 243                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);  /* Enable int's */
 244                 if (overrides[current_override].irq != IRQ_AUTO)
 245                         instance->irq = overrides[current_override].irq;
 246                 else
 247                         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
 248
 249                 /* Compatibility with documented NCR5380 kernel parameters */
 250                 if (instance->irq == 255)
 251                         instance->irq = NO_IRQ;
 252
 253 #ifndef DONT_USE_INTR
 254                 /* With interrupts enabled, it will sometimes hang when doing heavy
 255                  * reads. So better not enable them until I finger it out. */
 256                 if (instance->irq != NO_IRQ)
 257                         if (request_irq(instance->irq, dtc_intr, 0,
 258                                         "dtc", instance)) {
 259                                 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 260                                 instance->irq = NO_IRQ;
 261                         }
 262
 263                 if (instance->irq == NO_IRQ) {
 264                         printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 265                         printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 266                 }
 267 #else
 268                 if (instance->irq != NO_IRQ)
 269                         printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
 270                 instance->irq = NO_IRQ;
 271 #endif
 272                 dprintk(NDEBUG_INIT, "scsi%d : irq = %d\n",
 273                         instance->host_no, instance->irq);
 274
 275                 ++current_override;
 276                 ++count;
 277         }
 278         return count;
 279
 280 out_unregister:
 281         scsi_unregister(instance);
 282 out_unmap:
 283         iounmap(base);
 284         return count;
 285 }
 286
 287 /*
 288  * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
 289  *
 290  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 291  *      the specified device / size.
 292  *
 293  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 294  *      major / minor, ip[] = {heads, sectors, cylinders}
 295  *
 296  * Returns : always 0 (success), initializes ip
 297  *
 298 */
 299
 300 /*
 301  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 302  * using hard disks on a trantor should verify that this mapping corresponds
 303  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 304  * and matching the H_C_S coordinates to what DOS uses.
 305 */
 306
 307 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
 308                          sector_t capacity, int *ip)
 309 {
 310         int size = capacity;
 311
 312         ip[0] = 64;
 313         ip[1] = 32;
 314         ip[2] = size >> 11;
 315         return 0;
 316 }
 317
 318
 319 /****************************************************************
 320  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 321  *      unsigned char *dst, int len)
 322  *
 323  * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
 324  *      dst
 325  *
 326  * Inputs : dst = destination, len = length in bytes
 327  *
 328  * Returns : 0 on success, non zero on a failure such as a watchdog
 329  *      timeout.
 330 */
 331
 332 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 333 {
 334         unsigned char *d = dst;
 335         int i;                  /* For counting time spent in the poll-loop */
 336         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 337
 338         i = 0;
 339         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 340         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 341         if (instance->irq == NO_IRQ)
 342                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
 343         else
 344                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
 345         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 346         rtrc(1);
 347         while (len > 0) {
 348                 rtrc(2);
 349                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 350                         ++i;
 351                 rtrc(3);
 352                 memcpy_fromio(d, hostdata->base + DTC_DATA_BUF, 128);
 353                 d += 128;
 354                 len -= 128;
 355                 rtrc(7);
 356                 /*** with int's on, it sometimes hangs after here.
 357                  * Looks like something makes HBNR go away. */
 358         }
 359         rtrc(4);
 360         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 361                 ++i;
 362         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 363         rtrc(0);
 364         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 365         if (i > hostdata->spin_max_r)
 366                 hostdata->spin_max_r = i;
 367         return (0);
 368 }
 369
 370 /****************************************************************
 371  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 372  *      unsigned char *src, int len)
 373  *
 374  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 375  *      src
 376  *
 377  * Inputs : src = source, len = length in bytes
 378  *
 379  * Returns : 0 on success, non zero on a failure such as a watchdog
 380  *      timeout.
 381 */
 382
 383 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 384 {
 385         int i;
 386         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 387
 388         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 389         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 390         /* set direction (write) */
 391         if (instance->irq == NO_IRQ)
 392                 NCR5380_write(DTC_CONTROL_REG, 0);
 393         else
 394                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
 395         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 396         for (i = 0; len > 0; ++i) {
 397                 rtrc(5);
 398                 /* Poll until the host buffer can accept data. */
 399                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 400                         ++i;
 401                 rtrc(3);
 402                 memcpy_toio(hostdata->base + DTC_DATA_BUF, src, 128);
 403                 src += 128;
 404                 len -= 128;
 405         }
 406         rtrc(4);
 407         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 408                 ++i;
 409         rtrc(6);
 410         /* Wait until the last byte has been sent to the disk */
 411         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 412                 ++i;
 413         rtrc(7);
 414         /* Check for parity error here. fixme. */
 415         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 416         rtrc(0);
 417         if (i > hostdata->spin_max_w)
 418                 hostdata->spin_max_w = i;
 419         return (0);
 420 }
 421
 422 MODULE_LICENSE("GPL");
 423
 424 #include "NCR5380.c"
 425
 426 static int dtc_release(struct Scsi_Host *shost)
 427 {
 428         struct NCR5380_hostdata *hostdata = shost_priv(shost);
 429
 430         if (shost->irq != NO_IRQ)
 431                 free_irq(shost->irq, shost);
 432         NCR5380_exit(shost);
 433         scsi_unregister(shost);
 434         iounmap(hostdata->base);
 435         return 0;
 436 }
 437
 438 static struct scsi_host_template driver_template = {
 439         .name                           = "DTC 3180/3280 ",
 440         .detect                         = dtc_detect,
 441         .release                        = dtc_release,
 442         .proc_name                      = "dtc3x80",
 443         .show_info                      = dtc_show_info,
 444         .write_info                     = dtc_write_info,
 445         .info                           = dtc_info,
 446         .queuecommand                   = dtc_queue_command,
 447         .eh_abort_handler               = dtc_abort,
 448         .eh_bus_reset_handler           = dtc_bus_reset,
 449         .bios_param                     = dtc_biosparam,
 450         .can_queue                      = CAN_QUEUE,
 451         .this_id                        = 7,
 452         .sg_tablesize                   = SG_ALL,
 453         .cmd_per_lun                    = CMD_PER_LUN,
 454         .use_clustering                 = DISABLE_CLUSTERING,
 455 };
 456 #include "scsi_module.c"