drivers/scsi/NCR53c406a.c

   1 /*
   2  *  NCR53c406.c
   3  *  Low-level SCSI driver for NCR53c406a chip.
   4  *  Copyright (C) 1994, 1995, 1996 Normunds Saumanis (normunds@fi.ibm.com)
   5  *
   6  *  LILO command line usage: ncr53c406a=<PORTBASE>[,<IRQ>[,<FASTPIO>]]
   7  *  Specify IRQ = 0 for non-interrupt driven mode.
   8  *  FASTPIO = 1 for fast pio mode, 0 for slow mode.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License as published by the
  12  *  Free Software Foundation; either version 2, or (at your option) any
  13  *  later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  */
  21
  22 #define NCR53C406A_DEBUG 0
  23 #define VERBOSE_NCR53C406A_DEBUG 0
  24
  25 /* Set this to 1 for PIO mode (recommended) or to 0 for DMA mode */
  26 #define USE_PIO 1
  27
  28 #define USE_BIOS 0
  29                                 /* #define BIOS_ADDR 0xD8000 *//* define this if autoprobe fails */
  30                                 /* #define PORT_BASE 0x330 *//* define this if autoprobe fails */
  31                                 /* #define IRQ_LEV   0  *//* define this if autoprobe fails */
  32 #define DMA_CHAN  5             /* this is ignored if DMA is disabled */
  33
  34 /* Set this to 0 if you encounter kernel lockups while transferring
  35  * data in PIO mode */
  36 #define USE_FAST_PIO 1
  37
  38 /* ============= End of user configurable parameters ============= */
  39
  40 #include <linux/module.h>
  41
  42 #include <linux/errno.h>
  43 #include <linux/ioport.h>
  44 #include <linux/sched.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/proc_fs.h>
  47 #include <linux/stat.h>
  48 #include <linux/init.h>
  49 #include <asm/io.h>
  50 #include <asm/dma.h>
  51 #include <asm/bitops.h>
  52 #include <asm/irq.h>
  53
  54 #include <linux/blkdev.h>
  55 #include <linux/spinlock.h>
  56 #include "scsi.h"
  57 #include "hosts.h"
  58
  59 /* ============================================================= */
  60
  61 #define WATCHDOG 5000000
  62
  63 #define SYNC_MODE 0             /* Synchronous transfer mode */
  64
  65 #if DEBUG
  66 #undef NCR53C406A_DEBUG
  67 #define NCR53C406A_DEBUG 1
  68 #endif
  69
  70 #if USE_PIO
  71 #define USE_DMA 0
  72 #else
  73 #define USE_DMA 1
  74 #endif
  75
  76 /* Default configuration */
  77 #define C1_IMG   0x07           /* ID=7 */
  78 #define C2_IMG   0x48           /* FE SCSI2 */
  79 #if USE_DMA
  80 #define C3_IMG   0x21           /* CDB TE */
  81 #else
  82 #define C3_IMG   0x20           /* CDB */
  83 #endif
  84 #define C4_IMG   0x04           /* ANE */
  85 #define C5_IMG   0xb6           /* AA PI SIE POL */
  86
  87 #define REG0 (outb(C4_IMG, CONFIG4))
  88 #define REG1 (outb(C5_IMG, CONFIG5))
  89
  90 #if NCR53C406A_DEBUG
  91 #define DEB(x) x
  92 #else
  93 #define DEB(x)
  94 #endif
  95
  96 #if VERBOSE_NCR53C406A_DEBUG
  97 #define VDEB(x) x
  98 #else
  99 #define VDEB(x)
 100 #endif
 101
 102 #define LOAD_DMA_COUNT(count) \
 103   outb(count & 0xff, TC_LSB); \
 104   outb((count >> 8) & 0xff, TC_MSB); \
 105   outb((count >> 16) & 0xff, TC_HIGH);
 106
 107 /* Chip commands */
 108 #define DMA_OP               0x80
 109
 110 #define SCSI_NOP             0x00
 111 #define FLUSH_FIFO           0x01
 112 #define CHIP_RESET           0x02
 113 #define SCSI_RESET           0x03
 114 #define RESELECT             0x40
 115 #define SELECT_NO_ATN        0x41
 116 #define SELECT_ATN           0x42
 117 #define SELECT_ATN_STOP      0x43
 118 #define ENABLE_SEL           0x44
 119 #define DISABLE_SEL          0x45
 120 #define SELECT_ATN3          0x46
 121 #define RESELECT3            0x47
 122 #define TRANSFER_INFO        0x10
 123 #define INIT_CMD_COMPLETE    0x11
 124 #define MSG_ACCEPT           0x12
 125 #define TRANSFER_PAD         0x18
 126 #define SET_ATN              0x1a
 127 #define RESET_ATN            0x1b
 128 #define SEND_MSG             0x20
 129 #define SEND_STATUS          0x21
 130 #define SEND_DATA            0x22
 131 #define DISCONN_SEQ          0x23
 132 #define TERMINATE_SEQ        0x24
 133 #define TARG_CMD_COMPLETE    0x25
 134 #define DISCONN              0x27
 135 #define RECV_MSG             0x28
 136 #define RECV_CMD             0x29
 137 #define RECV_DATA            0x2a
 138 #define RECV_CMD_SEQ         0x2b
 139 #define TARGET_ABORT_DMA     0x04
 140
 141 /*----------------------------------------------------------------*/
 142 /* the following will set the monitor border color (useful to find
 143    where something crashed or gets stuck at */
 144 /* 1 = blue
 145    2 = green
 146    3 = cyan
 147    4 = red
 148    5 = magenta
 149    6 = yellow
 150    7 = white
 151 */
 152
 153 #if NCR53C406A_DEBUG
 154 #define rtrc(i) {inb(0x3da);outb(0x31,0x3c0);outb((i),0x3c0);}
 155 #else
 156 #define rtrc(i) {}
 157 #endif
 158 /*----------------------------------------------------------------*/
 159
 160 enum Phase {
 161         idle,
 162         data_out,
 163         data_in,
 164         command_ph,
 165         status_ph,
 166         message_out,
 167         message_in
 168 };
 169
 170 /* Static function prototypes */
 171 static void NCR53c406a_intr(int, void *, struct pt_regs *);
 172 static irqreturn_t do_NCR53c406a_intr(int, void *, struct pt_regs *);
 173 static void wait_intr(void);
 174 static void chip_init(void);
 175 static void calc_port_addr(void);
 176 #ifndef IRQ_LEV
 177 static int irq_probe(void);
 178 #endif
 179
 180 /* ================================================================= */
 181
 182 #if USE_BIOS
 183 static void *bios_base;
 184 #endif
 185
 186 #if PORT_BASE
 187 static int port_base = PORT_BASE;
 188 #else
 189 static int port_base;
 190 #endif
 191
 192 #if IRQ_LEV
 193 static int irq_level = IRQ_LEV;
 194 #else
 195 static int irq_level = -1;      /* 0 is 'no irq', so use -1 for 'uninitialized' */
 196 #endif
 197
 198 #if USE_DMA
 199 static int dma_chan;
 200 #endif
 201
 202 #if USE_PIO
 203 static int fast_pio = USE_FAST_PIO;
 204 #endif
 205
 206 static Scsi_Cmnd *current_SC;
 207 static char info_msg[256];
 208
 209 /* ================================================================= */
 210
 211 /* possible BIOS locations */
 212 #if USE_BIOS
 213 static void *addresses[] = {
 214         (void *) 0xd8000,
 215         (void *) 0xc8000
 216 };
 217 #define ADDRESS_COUNT (sizeof( addresses ) / sizeof( unsigned ))
 218 #endif                          /* USE_BIOS */
 219
 220 /* possible i/o port addresses */
 221 static unsigned short ports[] = { 0x230, 0x330, 0x280, 0x290, 0x330, 0x340, 0x300, 0x310, 0x348, 0x350 };
 222 #define PORT_COUNT (sizeof( ports ) / sizeof( unsigned short ))
 223
 224 /* possible interrupt channels */
 225 static unsigned short intrs[] = { 10, 11, 12, 15 };
 226 #define INTR_COUNT (sizeof( intrs ) / sizeof( unsigned short ))
 227
 228 /* signatures for NCR 53c406a based controllers */
 229 #if USE_BIOS
 230 struct signature {
 231         char *signature;
 232         int sig_offset;
 233         int sig_length;
 234 } signatures[] __initdata = {
 235         /*          1         2         3         4         5         6 */
 236         /* 123456789012345678901234567890123456789012345678901234567890 */
 237         {
 238 "Copyright (C) Acculogic, Inc.\r\n2.8M Diskette Extension Bios ver 4.04.03 03/01/1993", 61, 82},};
 239
 240 #define SIGNATURE_COUNT (sizeof( signatures ) / sizeof( struct signature ))
 241 #endif                          /* USE_BIOS */
 242
 243 /* ============================================================ */
 244
 245 /* Control Register Set 0 */
 246 static int TC_LSB;              /* transfer counter lsb         */
 247 static int TC_MSB;              /* transfer counter msb */
 248 static int SCSI_FIFO;           /* scsi fifo register   */
 249 static int CMD_REG;             /* command register             */
 250 static int STAT_REG;            /* status register              */
 251 static int DEST_ID;             /* selection/reselection bus id */
 252 static int INT_REG;             /* interrupt status register    */
 253 static int SRTIMOUT;            /* select/reselect timeout reg  */
 254 static int SEQ_REG;             /* sequence step register       */
 255 static int SYNCPRD;             /* synchronous transfer period  */
 256 static int FIFO_FLAGS;          /* indicates # of bytes in fifo */
 257 static int SYNCOFF;             /* synchronous offset register  */
 258 static int CONFIG1;             /* configuration register       */
 259 static int CLKCONV;             /* clock conversion reg */
 260                                 /*static int TESTREG;*//* test mode register           */
 261 static int CONFIG2;             /* Configuration 2 Register     */
 262 static int CONFIG3;             /* Configuration 3 Register     */
 263 static int CONFIG4;             /* Configuration 4 Register     */
 264 static int TC_HIGH;             /* Transfer Counter High */
 265                                 /*static int FIFO_BOTTOM;*//* Reserve FIFO byte register   */
 266
 267 /* Control Register Set 1 */
 268                                 /*static int JUMPER_SENSE;*//* Jumper sense port reg (r/w) */
 269                                 /*static int SRAM_PTR;*//* SRAM address pointer reg (r/w) */
 270                                 /*static int SRAM_DATA;*//* SRAM data register (r/w) */
 271 static int PIO_FIFO;            /* PIO FIFO registers (r/w) */
 272                                 /*static int PIO_FIFO1;*//*  */
 273                                 /*static int PIO_FIFO2;*//*  */
 274                                 /*static int PIO_FIFO3;*//*  */
 275 static int PIO_STATUS;          /* PIO status (r/w) */
 276                                 /*static int ATA_CMD;*//* ATA command/status reg (r/w) */
 277                                 /*static int ATA_ERR;*//* ATA features/error register (r/w) */
 278 static int PIO_FLAG;            /* PIO flag interrupt enable (r/w) */
 279 static int CONFIG5;             /* Configuration 5 register (r/w) */
 280                                 /*static int SIGNATURE;*//* Signature Register (r) */
 281                                 /*static int CONFIG6;*//* Configuration 6 register (r) */
 282
 283 /* ============================================================== */
 284
 285 #if USE_DMA
 286 static __inline__ int NCR53c406a_dma_setup(unsigned char *ptr, unsigned int count, unsigned char mode)
 287 {
 288         unsigned limit;
 289         unsigned long flags = 0;
 290
 291         VDEB(printk("dma: before count=%d   ", count));
 292         if (dma_chan <= 3) {
 293                 if (count > 65536)
 294                         count = 65536;
 295                 limit = 65536 - (((unsigned) ptr) & 0xFFFF);
 296         } else {
 297                 if (count > (65536 << 1))
 298                         count = (65536 << 1);
 299                 limit = (65536 << 1) - (((unsigned) ptr) & 0x1FFFF);
 300         }
 301
 302         if (count > limit)
 303                 count = limit;
 304
 305         VDEB(printk("after count=%d\n", count));
 306         if ((count & 1) || (((unsigned) ptr) & 1))
 307                 panic("NCR53c406a: attempted unaligned DMA transfer\n");
 308
 309         flags = claim_dma_lock();
 310         disable_dma(dma_chan);
 311         clear_dma_ff(dma_chan);
 312         set_dma_addr(dma_chan, (long) ptr);
 313         set_dma_count(dma_chan, count);
 314         set_dma_mode(dma_chan, mode);
 315         enable_dma(dma_chan);
 316         release_dma_lock(flags);
 317
 318         return count;
 319 }
 320
 321 static __inline__ int NCR53c406a_dma_write(unsigned char *src, unsigned int count)
 322 {
 323         return NCR53c406a_dma_setup(src, count, DMA_MODE_WRITE);
 324 }
 325
 326 static __inline__ int NCR53c406a_dma_read(unsigned char *src, unsigned int count)
 327 {
 328         return NCR53c406a_dma_setup(src, count, DMA_MODE_READ);
 329 }
 330
 331 static __inline__ int NCR53c406a_dma_residual(void)
 332 {
 333         register int tmp;
 334         unsigned long flags;
 335
 336         flags = claim_dma_lock();
 337         clear_dma_ff(dma_chan);
 338         tmp = get_dma_residue(dma_chan);
 339         release_dma_lock(flags);
 340
 341         return tmp;
 342 }
 343 #endif                          /* USE_DMA */
 344
 345 #if USE_PIO
 346 static __inline__ int NCR53c406a_pio_read(unsigned char *request, unsigned int reqlen)
 347 {
 348         int i;
 349         int len;                /* current scsi fifo size */
 350
 351         REG1;
 352         while (reqlen) {
 353                 i = inb(PIO_STATUS);
 354                 /*    VDEB(printk("pio_status=%x\n", i)); */
 355                 if (i & 0x80)
 356                         return 0;
 357
 358                 switch (i & 0x1e) {
 359                 default:
 360                 case 0x10:
 361                         len = 0;
 362                         break;
 363                 case 0x0:
 364                         len = 1;
 365                         break;
 366                 case 0x8:
 367                         len = 42;
 368                         break;
 369                 case 0xc:
 370                         len = 84;
 371                         break;
 372                 case 0xe:
 373                         len = 128;
 374                         break;
 375                 }
 376
 377                 if ((i & 0x40) && len == 0) {   /* fifo empty and interrupt occurred */
 378                         return 0;
 379                 }
 380
 381                 if (len) {
 382                         if (len > reqlen)
 383                                 len = reqlen;
 384
 385                         if (fast_pio && len > 3) {
 386                                 insl(PIO_FIFO, request, len >> 2);
 387                                 request += len & 0xfc;
 388                                 reqlen -= len & 0xfc;
 389                         } else {
 390                                 while (len--) {
 391                                         *request++ = inb(PIO_FIFO);
 392                                         reqlen--;
 393                                 }
 394                         }
 395                 }
 396         }
 397         return 0;
 398 }
 399
 400 static __inline__ int NCR53c406a_pio_write(unsigned char *request, unsigned int reqlen)
 401 {
 402         int i = 0;
 403         int len;                /* current scsi fifo size */
 404
 405         REG1;
 406         while (reqlen && !(i & 0x40)) {
 407                 i = inb(PIO_STATUS);
 408                 /*    VDEB(printk("pio_status=%x\n", i)); */
 409                 if (i & 0x80)   /* error */
 410                         return 0;
 411
 412                 switch (i & 0x1e) {
 413                 case 0x10:
 414                         len = 128;
 415                         break;
 416                 case 0x0:
 417                         len = 84;
 418                         break;
 419                 case 0x8:
 420                         len = 42;
 421                         break;
 422                 case 0xc:
 423                         len = 1;
 424                         break;
 425                 default:
 426                 case 0xe:
 427                         len = 0;
 428                         break;
 429                 }
 430
 431                 if (len) {
 432                         if (len > reqlen)
 433                                 len = reqlen;
 434
 435                         if (fast_pio && len > 3) {
 436                                 outsl(PIO_FIFO, request, len >> 2);
 437                                 request += len & 0xfc;
 438                                 reqlen -= len & 0xfc;
 439                         } else {
 440                                 while (len--) {
 441                                         outb(*request++, PIO_FIFO);
 442                                         reqlen--;
 443                                 }
 444                         }
 445                 }
 446         }
 447         return 0;
 448 }
 449 #endif                          /* USE_PIO */
 450
 451 static int __init NCR53c406a_detect(Scsi_Host_Template * tpnt)
 452 {
 453         int present = 0;
 454         struct Scsi_Host *shpnt = NULL;
 455 #ifndef PORT_BASE
 456         int i;
 457 #endif
 458
 459 #if USE_BIOS
 460         int ii, jj;
 461         bios_base = 0;
 462         /* look for a valid signature */
 463         for (ii = 0; ii < ADDRESS_COUNT && !bios_base; ii++)
 464                 for (jj = 0; (jj < SIGNATURE_COUNT) && !bios_base; jj++)
 465                         if (!memcmp((void *) addresses[ii] + signatures[jj].sig_offset, (void *) signatures[jj].signature, (int) signatures[jj].sig_length))
 466                                 bios_base = addresses[ii];
 467
 468         if (!bios_base) {
 469                 printk("NCR53c406a: BIOS signature not found\n");
 470                 return 0;
 471         }
 472
 473         DEB(printk("NCR53c406a BIOS found at 0x%x\n", (unsigned int) bios_base);
 474             );
 475 #endif                          /* USE_BIOS */
 476
 477 #ifdef PORT_BASE
 478         if (!request_region(port_base, 0x10, "NCR53c406a"))     /* ports already snatched */
 479                 port_base = 0;
 480
 481 #else                           /* autodetect */
 482         if (port_base) {        /* LILO override */
 483                 if (!request_region(port_base, 0x10, "NCR53c406a"))
 484                         port_base = 0;
 485         } else {
 486                 for (i = 0; i < PORT_COUNT && !port_base; i++) {
 487                         if (!request_region(ports[i], 0x10, "NCR53c406a")) {
 488                                 DEB(printk("NCR53c406a: port 0x%x in use\n", ports[i]));
 489                         } else {
 490                                 VDEB(printk("NCR53c406a: port 0x%x available\n", ports[i]));
 491                                 outb(C5_IMG, ports[i] + 0x0d);  /* reg set 1 */
 492                                 if ((inb(ports[i] + 0x0e) ^ inb(ports[i] + 0x0e)) == 7 && (inb(ports[i] + 0x0e) ^ inb(ports[i] + 0x0e)) == 7 && (inb(ports[i] + 0x0e) & 0xf8) == 0x58) {
 493                                         port_base = ports[i];
 494                                         VDEB(printk("NCR53c406a: Sig register valid\n"));
 495                                         VDEB(printk("port_base=0x%x\n", port_base));
 496                                         break;
 497                                 }
 498                                 release_region(ports[i], 0x10);
 499                         }
 500                 }
 501         }
 502 #endif                          /* PORT_BASE */
 503
 504         if (!port_base) {       /* no ports found */
 505                 printk("NCR53c406a: no available ports found\n");
 506                 return 0;
 507         }
 508
 509         DEB(printk("NCR53c406a detected\n"));
 510
 511         calc_port_addr();
 512         chip_init();
 513
 514 #ifndef IRQ_LEV
 515         if (irq_level < 0) {    /* LILO override if >= 0 */
 516                 irq_level = irq_probe();
 517                 if (irq_level < 0) {    /* Trouble */
 518                         printk("NCR53c406a: IRQ problem, irq_level=%d, giving up\n", irq_level);
 519                         goto err_release;
 520                 }
 521         }
 522 #endif
 523
 524         DEB(printk("NCR53c406a: using port_base 0x%x\n", port_base));
 525
 526         present = 1;
 527         tpnt->proc_name = "NCR53c406a";
 528
 529         shpnt = scsi_register(tpnt, 0);
 530         if (!shpnt) {
 531                 printk("NCR53c406a: Unable to register host, giving up.\n");
 532                 goto err_release;
 533         }
 534
 535         if (irq_level > 0) {
 536                 if (request_irq(irq_level, do_NCR53c406a_intr, 0, "NCR53c406a", shpnt)) {
 537                         printk("NCR53c406a: unable to allocate IRQ %d\n", irq_level);
 538                         goto err_free_scsi;
 539                 }
 540                 tpnt->can_queue = 1;
 541                 DEB(printk("NCR53c406a: allocated IRQ %d\n", irq_level));
 542         } else if (irq_level == 0) {
 543                 tpnt->can_queue = 0;
 544                 DEB(printk("NCR53c406a: No interrupts detected\n"));
 545                 printk("NCR53c406a driver no longer supports polling interface\n");
 546                 printk("Please email linux-scsi@vger.kernel.org\n");
 547
 548 #if USE_DMA
 549                 printk("NCR53c406a: No interrupts found and DMA mode defined. Giving up.\n");
 550 #endif                          /* USE_DMA */
 551                 goto err_free_scsi;
 552         } else {
 553                 DEB(printk("NCR53c406a: Shouldn't get here!\n"));
 554                 goto err_free_scsi;
 555         }
 556
 557 #if USE_DMA
 558         dma_chan = DMA_CHAN;
 559         if (request_dma(dma_chan, "NCR53c406a") != 0) {
 560                 printk("NCR53c406a: unable to allocate DMA channel %d\n", dma_chan);
 561                 goto err_free_irq;
 562         }
 563
 564         DEB(printk("Allocated DMA channel %d\n", dma_chan));
 565 #endif                          /* USE_DMA */
 566
 567         shpnt->irq = irq_level;
 568         shpnt->io_port = port_base;
 569         shpnt->n_io_port = 0x10;
 570 #if USE_DMA
 571         shpnt->dma = dma_chan;
 572 #endif
 573
 574 #if USE_DMA
 575         sprintf(info_msg, "NCR53c406a at 0x%x, IRQ %d, DMA channel %d.", port_base, irq_level, dma_chan);
 576 #else
 577         sprintf(info_msg, "NCR53c406a at 0x%x, IRQ %d, %s PIO mode.", port_base, irq_level, fast_pio ? "fast" : "slow");
 578 #endif
 579
 580         return (present);
 581
 582 #if USE_DMA
 583       err_free_irq:
 584         if (irq_level)
 585                 free_irq(irq_level, shpnt);
 586 #endif
 587       err_free_scsi:
 588         scsi_unregister(shpnt);
 589       err_release:
 590         release_region(port_base, 0x10);
 591         return 0;
 592 }
 593
 594 static int NCR53c406a_release(struct Scsi_Host *shost)
 595 {
 596         if (shost->irq)
 597                 free_irq(shost->irq, NULL);
 598 #ifdef USE_DMA
 599         if (shost->dma_channel != 0xff)
 600                 free_dma(shost->dma_channel);
 601 #endif
 602         if (shost->io_port && shost->n_io_port)
 603                 release_region(shost->io_port, shost->n_io_port);
 604
 605         scsi_unregister(shost);
 606         return 0;
 607 }
 608
 609 /* called from init/main.c */
 610 static void __init NCR53c406a_setup(char *str, int *ints)
 611 {
 612         static size_t setup_idx = 0;
 613         size_t i;
 614
 615         DEB(printk("NCR53c406a: Setup called\n");
 616             );
 617
 618         if (setup_idx >= PORT_COUNT - 1) {
 619                 printk("NCR53c406a: Setup called too many times.  Bad LILO params?\n");
 620                 return;
 621         }
 622         if (ints[0] < 1 || ints[0] > 3) {
 623                 printk("NCR53c406a: Malformed command line\n");
 624                 printk("NCR53c406a: Usage: ncr53c406a=<PORTBASE>[,<IRQ>[,<FASTPIO>]]\n");
 625                 return;
 626         }
 627         for (i = 0; i < PORT_COUNT && !port_base; i++)
 628                 if (ports[i] == ints[1]) {
 629                         port_base = ints[1];
 630                         DEB(printk("NCR53c406a: Specified port_base 0x%x\n", port_base);
 631                             )
 632                 }
 633         if (!port_base) {
 634                 printk("NCR53c406a: Invalid PORTBASE 0x%x specified\n", ints[1]);
 635                 return;
 636         }
 637
 638         if (ints[0] > 1) {
 639                 if (ints[2] == 0) {
 640                         irq_level = 0;
 641                         DEB(printk("NCR53c406a: Specified irq %d\n", irq_level);
 642                             )
 643                 } else
 644                         for (i = 0; i < INTR_COUNT && irq_level < 0; i++)
 645                                 if (intrs[i] == ints[2]) {
 646                                         irq_level = ints[2];
 647                                         DEB(printk("NCR53c406a: Specified irq %d\n", port_base);
 648                                             )
 649                                 }
 650                 if (irq_level < 0)
 651                         printk("NCR53c406a: Invalid IRQ %d specified\n", ints[2]);
 652         }
 653
 654         if (ints[0] > 2)
 655                 fast_pio = ints[3];
 656
 657         DEB(printk("NCR53c406a: port_base=0x%x, irq=%d, fast_pio=%d\n", port_base, irq_level, fast_pio);)
 658 }
 659
 660 __setup("ncr53c406a=", NCR53c406a_setup);
 661
 662 static const char *NCR53c406a_info(struct Scsi_Host *SChost)
 663 {
 664         DEB(printk("NCR53c406a_info called\n"));
 665         return (info_msg);
 666 }
 667
 668 static void wait_intr(void)
 669 {
 670         unsigned long i = jiffies + WATCHDOG;
 671
 672         while (time_after(i, jiffies) && !(inb(STAT_REG) & 0xe0)) {     /* wait for a pseudo-interrupt */
 673                 cpu_relax();
 674                 barrier();
 675         }
 676
 677         if (time_before_eq(i, jiffies)) {       /* Timed out */
 678                 rtrc(0);
 679                 current_SC->result = DID_TIME_OUT << 16;
 680                 current_SC->SCp.phase = idle;
 681                 current_SC->scsi_done(current_SC);
 682                 return;
 683         }
 684
 685         NCR53c406a_intr(0, NULL, NULL);
 686 }
 687
 688 static int NCR53c406a_queue(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
 689 {
 690         int i;
 691
 692         VDEB(printk("NCR53c406a_queue called\n"));
 693         DEB(printk("cmd=%02x, cmd_len=%02x, target=%02x, lun=%02x, bufflen=%d\n", SCpnt->cmnd[0], SCpnt->cmd_len, SCpnt->target, SCpnt->lun, SCpnt->request_bufflen));
 694
 695 #if 0
 696         VDEB(for (i = 0; i < SCpnt->cmd_len; i++)
 697              printk("cmd[%d]=%02x  ", i, SCpnt->cmnd[i]));
 698         VDEB(printk("\n"));
 699 #endif
 700
 701         current_SC = SCpnt;
 702         current_SC->scsi_done = done;
 703         current_SC->SCp.phase = command_ph;
 704         current_SC->SCp.Status = 0;
 705         current_SC->SCp.Message = 0;
 706
 707         /* We are locked here already by the mid layer */
 708         REG0;
 709         outb(SCpnt->device->id, DEST_ID);       /* set destination */
 710         outb(FLUSH_FIFO, CMD_REG);      /* reset the fifos */
 711
 712         for (i = 0; i < SCpnt->cmd_len; i++) {
 713                 outb(SCpnt->cmnd[i], SCSI_FIFO);
 714         }
 715         outb(SELECT_NO_ATN, CMD_REG);
 716
 717         rtrc(1);
 718         return 0;
 719 }
 720
 721 static int NCR53c406a_abort(Scsi_Cmnd * SCpnt)
 722 {
 723         DEB(printk("NCR53c406a_abort called\n"));
 724         return FAILED;          /* Don't know how to abort */
 725 }
 726
 727 static int NCR53c406a_host_reset(Scsi_Cmnd * SCpnt)
 728 {
 729         DEB(printk("NCR53c406a_reset called\n"));
 730         outb(C4_IMG, CONFIG4);  /* Select reg set 0 */
 731         outb(CHIP_RESET, CMD_REG);
 732         outb(SCSI_NOP, CMD_REG);        /* required after reset */
 733         outb(SCSI_RESET, CMD_REG);
 734         chip_init();
 735
 736         rtrc(2);
 737         return SUCCESS;
 738 }
 739
 740 static int NCR53c406a_device_reset(Scsi_Cmnd * SCpnt)
 741 {
 742         return FAILED;
 743 }
 744
 745 static int NCR53c406a_bus_reset(Scsi_Cmnd * SCpnt)
 746 {
 747         return FAILED;
 748 }
 749
 750 static int NCR53c406a_biosparm(struct scsi_device *disk,
 751                                struct block_device *dev,
 752                                sector_t capacity, int *info_array)
 753 {
 754         int size;
 755
 756         DEB(printk("NCR53c406a_biosparm called\n"));
 757
 758         size = capacity;
 759         info_array[0] = 64;     /* heads */
 760         info_array[1] = 32;     /* sectors */
 761         info_array[2] = size >> 11;     /* cylinders */
 762         if (info_array[2] > 1024) {     /* big disk */
 763                 info_array[0] = 255;
 764                 info_array[1] = 63;
 765                 info_array[2] = size / (255 * 63);
 766         }
 767         return 0;
 768 }
 769
 770 static irqreturn_t do_NCR53c406a_intr(int unused, void *dev_id,
 771                                         struct pt_regs *regs)
 772 {
 773         unsigned long flags;
 774         struct Scsi_Host *dev = dev_id;
 775
 776         spin_lock_irqsave(dev->host_lock, flags);
 777         NCR53c406a_intr(0, dev_id, regs);
 778         spin_unlock_irqrestore(dev->host_lock, flags);
 779         return IRQ_HANDLED;
 780 }
 781
 782 static void NCR53c406a_intr(int unused, void *dev_id, struct pt_regs *regs)
 783 {
 784         DEB(unsigned char fifo_size;
 785             )
 786             DEB(unsigned char seq_reg;
 787             )
 788         unsigned char status, int_reg;
 789 #if USE_PIO
 790         unsigned char pio_status;
 791         struct scatterlist *sglist;
 792         unsigned int sgcount;
 793 #endif
 794
 795         VDEB(printk("NCR53c406a_intr called\n"));
 796
 797 #if USE_PIO
 798         REG1;
 799         pio_status = inb(PIO_STATUS);
 800 #endif
 801         REG0;
 802         status = inb(STAT_REG);
 803         DEB(seq_reg = inb(SEQ_REG));
 804         int_reg = inb(INT_REG);
 805         DEB(fifo_size = inb(FIFO_FLAGS) & 0x1f);
 806
 807 #if NCR53C406A_DEBUG
 808         printk("status=%02x, seq_reg=%02x, int_reg=%02x, fifo_size=%02x", status, seq_reg, int_reg, fifo_size);
 809 #if (USE_DMA)
 810         printk("\n");
 811 #else
 812         printk(", pio=%02x\n", pio_status);
 813 #endif                          /* USE_DMA */
 814 #endif                          /* NCR53C406A_DEBUG */
 815
 816         if (int_reg & 0x80) {   /* SCSI reset intr */
 817                 rtrc(3);
 818                 DEB(printk("NCR53c406a: reset intr received\n"));
 819                 current_SC->SCp.phase = idle;
 820                 current_SC->result = DID_RESET << 16;
 821                 current_SC->scsi_done(current_SC);
 822                 return;
 823         }
 824 #if USE_PIO
 825         if (pio_status & 0x80) {
 826                 printk("NCR53C406A: Warning: PIO error!\n");
 827                 current_SC->SCp.phase = idle;
 828                 current_SC->result = DID_ERROR << 16;
 829                 current_SC->scsi_done(current_SC);
 830                 return;
 831         }
 832 #endif                          /* USE_PIO */
 833
 834         if (status & 0x20) {    /* Parity error */
 835                 printk("NCR53c406a: Warning: parity error!\n");
 836                 current_SC->SCp.phase = idle;
 837                 current_SC->result = DID_PARITY << 16;
 838                 current_SC->scsi_done(current_SC);
 839                 return;
 840         }
 841
 842         if (status & 0x40) {    /* Gross error */
 843                 printk("NCR53c406a: Warning: gross error!\n");
 844                 current_SC->SCp.phase = idle;
 845                 current_SC->result = DID_ERROR << 16;
 846                 current_SC->scsi_done(current_SC);
 847                 return;
 848         }
 849
 850         if (int_reg & 0x20) {   /* Disconnect */
 851                 DEB(printk("NCR53c406a: disconnect intr received\n"));
 852                 if (current_SC->SCp.phase != message_in) {      /* Unexpected disconnect */
 853                         current_SC->result = DID_NO_CONNECT << 16;
 854                 } else {        /* Command complete, return status and message */
 855                         current_SC->result = (current_SC->SCp.Status & 0xff)
 856                             | ((current_SC->SCp.Message & 0xff) << 8) | (DID_OK << 16);
 857                 }
 858
 859                 rtrc(0);
 860                 current_SC->SCp.phase = idle;
 861                 current_SC->scsi_done(current_SC);
 862                 return;
 863         }
 864
 865         switch (status & 0x07) {        /* scsi phase */
 866         case 0x00:              /* DATA-OUT */
 867                 if (int_reg & 0x10) {   /* Target requesting info transfer */
 868                         rtrc(5);
 869                         current_SC->SCp.phase = data_out;
 870                         VDEB(printk("NCR53c406a: Data-Out phase\n"));
 871                         outb(FLUSH_FIFO, CMD_REG);
 872                         LOAD_DMA_COUNT(current_SC->request_bufflen);    /* Max transfer size */
 873 #if USE_DMA                     /* No s/g support for DMA */
 874                         NCR53c406a_dma_write(current_SC->request_buffer, current_SC->request_bufflen);
 875 #endif                          /* USE_DMA */
 876                         outb(TRANSFER_INFO | DMA_OP, CMD_REG);
 877 #if USE_PIO
 878                         if (!current_SC->use_sg)        /* Don't use scatter-gather */
 879                                 NCR53c406a_pio_write(current_SC->request_buffer, current_SC->request_bufflen);
 880                         else {  /* use scatter-gather */
 881                                 sgcount = current_SC->use_sg;
 882                                 sglist = current_SC->request_buffer;
 883                                 while (sgcount--) {
 884                                         NCR53c406a_pio_write(page_address(sglist->page) + sglist->offset, sglist->length);
 885                                         sglist++;
 886                                 }
 887                         }
 888                         REG0;
 889 #endif                          /* USE_PIO */
 890                 }
 891                 break;
 892
 893         case 0x01:              /* DATA-IN */
 894                 if (int_reg & 0x10) {   /* Target requesting info transfer */
 895                         rtrc(6);
 896                         current_SC->SCp.phase = data_in;
 897                         VDEB(printk("NCR53c406a: Data-In phase\n"));
 898                         outb(FLUSH_FIFO, CMD_REG);
 899                         LOAD_DMA_COUNT(current_SC->request_bufflen);    /* Max transfer size */
 900 #if USE_DMA                     /* No s/g support for DMA */
 901                         NCR53c406a_dma_read(current_SC->request_buffer, current_SC->request_bufflen);
 902 #endif                          /* USE_DMA */
 903                         outb(TRANSFER_INFO | DMA_OP, CMD_REG);
 904 #if USE_PIO
 905                         if (!current_SC->use_sg)        /* Don't use scatter-gather */
 906                                 NCR53c406a_pio_read(current_SC->request_buffer, current_SC->request_bufflen);
 907                         else {  /* Use scatter-gather */
 908                                 sgcount = current_SC->use_sg;
 909                                 sglist = current_SC->request_buffer;
 910                                 while (sgcount--) {
 911                                         NCR53c406a_pio_read(page_address(sglist->page) + sglist->offset, sglist->length);
 912                                         sglist++;
 913                                 }
 914                         }
 915                         REG0;
 916 #endif                          /* USE_PIO */
 917                 }
 918                 break;
 919
 920         case 0x02:              /* COMMAND */
 921                 current_SC->SCp.phase = command_ph;
 922                 printk("NCR53c406a: Warning: Unknown interrupt occurred in command phase!\n");
 923                 break;
 924
 925         case 0x03:              /* STATUS */
 926                 rtrc(7);
 927                 current_SC->SCp.phase = status_ph;
 928                 VDEB(printk("NCR53c406a: Status phase\n"));
 929                 outb(FLUSH_FIFO, CMD_REG);
 930                 outb(INIT_CMD_COMPLETE, CMD_REG);
 931                 break;
 932
 933         case 0x04:              /* Reserved */
 934         case 0x05:              /* Reserved */
 935                 printk("NCR53c406a: WARNING: Reserved phase!!!\n");
 936                 break;
 937
 938         case 0x06:              /* MESSAGE-OUT */
 939                 DEB(printk("NCR53c406a: Message-Out phase\n"));
 940                 current_SC->SCp.phase = message_out;
 941                 outb(SET_ATN, CMD_REG); /* Reject the message */
 942                 outb(MSG_ACCEPT, CMD_REG);
 943                 break;
 944
 945         case 0x07:              /* MESSAGE-IN */
 946                 rtrc(4);
 947                 VDEB(printk("NCR53c406a: Message-In phase\n"));
 948                 current_SC->SCp.phase = message_in;
 949
 950                 current_SC->SCp.Status = inb(SCSI_FIFO);
 951                 current_SC->SCp.Message = inb(SCSI_FIFO);
 952
 953                 VDEB(printk("SCSI FIFO size=%d\n", inb(FIFO_FLAGS) & 0x1f));
 954                 DEB(printk("Status = %02x  Message = %02x\n", current_SC->SCp.Status, current_SC->SCp.Message));
 955
 956                 if (current_SC->SCp.Message == SAVE_POINTERS || current_SC->SCp.Message == DISCONNECT) {
 957                         outb(SET_ATN, CMD_REG); /* Reject message */
 958                         DEB(printk("Discarding SAVE_POINTERS message\n"));
 959                 }
 960                 outb(MSG_ACCEPT, CMD_REG);
 961                 break;
 962         }
 963 }
 964
 965 #ifndef IRQ_LEV
 966 static int irq_probe(void)
 967 {
 968         int irqs, irq;
 969         unsigned long i;
 970
 971         inb(INT_REG);           /* clear the interrupt register */
 972         irqs = probe_irq_on();
 973
 974         /* Invalid command will cause an interrupt */
 975         REG0;
 976         outb(0xff, CMD_REG);
 977
 978         /* Wait for the interrupt to occur */
 979         i = jiffies + WATCHDOG;
 980         while (time_after(i, jiffies) && !(inb(STAT_REG) & 0x80))
 981                 barrier();
 982         if (time_before_eq(i, jiffies)) {       /* Timed out, must be hardware trouble */
 983                 probe_irq_off(irqs);
 984                 return -1;
 985         }
 986
 987         irq = probe_irq_off(irqs);
 988
 989         /* Kick the chip */
 990         outb(CHIP_RESET, CMD_REG);
 991         outb(SCSI_NOP, CMD_REG);
 992         chip_init();
 993
 994         return irq;
 995 }
 996 #endif                          /* IRQ_LEV */
 997
 998 static void chip_init(void)
 999 {
1000         REG1;
1001 #if USE_DMA
1002         outb(0x00, PIO_STATUS);
1003 #else                           /* USE_PIO */
1004         outb(0x01, PIO_STATUS);
1005 #endif
1006         outb(0x00, PIO_FLAG);
1007
1008         outb(C4_IMG, CONFIG4);  /* REG0; */
1009         outb(C3_IMG, CONFIG3);
1010         outb(C2_IMG, CONFIG2);
1011         outb(C1_IMG, CONFIG1);
1012
1013         outb(0x05, CLKCONV);    /* clock conversion factor */
1014         outb(0x9C, SRTIMOUT);   /* Selection timeout */
1015         outb(0x05, SYNCPRD);    /* Synchronous transfer period */
1016         outb(SYNC_MODE, SYNCOFF);       /* synchronous mode */
1017 }
1018
1019 static void __init calc_port_addr(void)
1020 {
1021         /* Control Register Set 0 */
1022         TC_LSB = (port_base + 0x00);
1023         TC_MSB = (port_base + 0x01);
1024         SCSI_FIFO = (port_base + 0x02);
1025         CMD_REG = (port_base + 0x03);
1026         STAT_REG = (port_base + 0x04);
1027         DEST_ID = (port_base + 0x04);
1028         INT_REG = (port_base + 0x05);
1029         SRTIMOUT = (port_base + 0x05);
1030         SEQ_REG = (port_base + 0x06);
1031         SYNCPRD = (port_base + 0x06);
1032         FIFO_FLAGS = (port_base + 0x07);
1033         SYNCOFF = (port_base + 0x07);
1034         CONFIG1 = (port_base + 0x08);
1035         CLKCONV = (port_base + 0x09);
1036         /* TESTREG          = (port_base+0x0A); */
1037         CONFIG2 = (port_base + 0x0B);
1038         CONFIG3 = (port_base + 0x0C);
1039         CONFIG4 = (port_base + 0x0D);
1040         TC_HIGH = (port_base + 0x0E);
1041         /* FIFO_BOTTOM      = (port_base+0x0F); */
1042
1043         /* Control Register Set 1 */
1044         /* JUMPER_SENSE     = (port_base+0x00); */
1045         /* SRAM_PTR         = (port_base+0x01); */
1046         /* SRAM_DATA        = (port_base+0x02); */
1047         PIO_FIFO = (port_base + 0x04);
1048         /* PIO_FIFO1        = (port_base+0x05); */
1049         /* PIO_FIFO2        = (port_base+0x06); */
1050         /* PIO_FIFO3        = (port_base+0x07); */
1051         PIO_STATUS = (port_base + 0x08);
1052         /* ATA_CMD          = (port_base+0x09); */
1053         /* ATA_ERR          = (port_base+0x0A); */
1054         PIO_FLAG = (port_base + 0x0B);
1055         CONFIG5 = (port_base + 0x0D);
1056         /* SIGNATURE        = (port_base+0x0E); */
1057         /* CONFIG6          = (port_base+0x0F); */
1058 }
1059
1060 MODULE_LICENSE("GPL");
1061
1062 /* NOTE:  scatter-gather support only works in PIO mode.
1063  * Use SG_NONE if DMA mode is enabled!
1064  */
1065
1066 static Scsi_Host_Template driver_template =
1067 {
1068      .proc_name                 = "NCR53c406a"          /* proc_name */,
1069      .name                      = "NCR53c406a"          /* name */,
1070      .detect                    = NCR53c406a_detect     /* detect */,
1071      .release                   = NCR53c406a_release,
1072      .info                      = NCR53c406a_info               /* info */,
1073      .queuecommand              = NCR53c406a_queue      /* queuecommand */,
1074      .eh_abort_handler          = NCR53c406a_abort      /* abort */,
1075      .eh_bus_reset_handler      = NCR53c406a_bus_reset  /* reset */,
1076      .eh_device_reset_handler   = NCR53c406a_device_reset       /* reset */,
1077      .eh_host_reset_handler     = NCR53c406a_host_reset /* reset */,
1078      .bios_param                = NCR53c406a_biosparm   /* biosparm */,
1079      .can_queue                 = 1                     /* can_queue */,
1080      .this_id                   = 7                     /* SCSI ID of the chip */,
1081      .sg_tablesize              = 32                    /*SG_ALL*/ /*SG_NONE*/,
1082      .cmd_per_lun               = 1                     /* commands per lun */,
1083      .unchecked_isa_dma         = 1                     /* unchecked_isa_dma */,
1084      .use_clustering            = ENABLE_CLUSTERING
1085 };
1086
1087 #include "scsi_module.c"
1088
1089 /*
1090  * Overrides for Emacs so that we get a uniform tabbing style.
1091  * Emacs will notice this stuff at the end of the file and automatically
1092  * adjust the settings for this buffer only.  This must remain at the end
1093  * of the file.
1094  * ---------------------------------------------------------------------------
1095  * Local variables:
1096  * c-indent-level: 4
1097  * c-brace-imaginary-offset: 0
1098  * c-brace-offset: -4
1099  * c-argdecl-indent: 4
1100  * c-label-offset: -4
1101  * c-continued-statement-offset: 4
1102  * c-continued-brace-offset: 0
1103  * indent-tabs-mode: nil
1104  * tab-width: 8
1105  * End:
1106  */