drivers/scsi/sun3_scsi.c

   1 /*
   2  * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl)
   3  *
   4  * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net)
   5  *
   6  * Adapted from mac_scsinew.c:
   7  */
   8 /*
   9  * Generic Macintosh NCR5380 driver
  10  *
  11  * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
  12  *
  13  * derived in part from:
  14  */
  15 /*
  16  * Generic Generic NCR5380 driver
  17  *
  18  * Copyright 1995, Russell King
  19  *
  20  * ALPHA RELEASE 1.
  21  *
  22  * For more information, please consult
  23  *
  24  * NCR 5380 Family
  25  * SCSI Protocol Controller
  26  * Databook
  27  *
  28  * NCR Microelectronics
  29  * 1635 Aeroplaza Drive
  30  * Colorado Springs, CO 80916
  31  * 1+ (719) 578-3400
  32  * 1+ (800) 334-5454
  33  */
  34
  35
  36 /*
  37  * This is from mac_scsi.h, but hey, maybe this is useful for Sun3 too! :)
  38  *
  39  * Options :
  40  *
  41  * PARITY - enable parity checking.  Not supported.
  42  *
  43  * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
  44  *
  45  * USLEEP - enable support for devices that don't disconnect.  Untested.
  46  */
  47
  48 /*
  49  * $Log: sun3_NCR5380.c,v $
  50  */
  51
  52 #define AUTOSENSE
  53
  54 #include <linux/types.h>
  55 #include <linux/stddef.h>
  56 #include <linux/ctype.h>
  57 #include <linux/delay.h>
  58
  59 #include <linux/module.h>
  60 #include <linux/signal.h>
  61 #include <linux/sched.h>
  62 #include <linux/ioport.h>
  63 #include <linux/init.h>
  64 #include <linux/blkdev.h>
  65
  66 #include <asm/io.h>
  67 #include <asm/system.h>
  68
  69 #include <asm/sun3ints.h>
  70 #include <asm/dvma.h>
  71 #include <asm/idprom.h>
  72 #include <asm/machines.h>
  73
  74 /* dma on! */
  75 #define REAL_DMA
  76
  77 #include "scsi.h"
  78 #include <scsi/scsi_host.h>
  79 #include "sun3_scsi.h"
  80 #include "NCR5380.h"
  81
  82 static void NCR5380_print(struct Scsi_Host *instance);
  83
  84 /* #define OLDDMA */
  85
  86 #define USE_WRAPPER
  87 /*#define RESET_BOOT */
  88 #define DRIVER_SETUP
  89
  90 #define NDEBUG 0
  91
  92 /*
  93  * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
  94  */
  95 #ifdef BUG
  96 #undef RESET_BOOT
  97 #undef DRIVER_SETUP
  98 #endif
  99
 100 /* #define SUPPORT_TAGS */
 101
 102 #define ENABLE_IRQ()    enable_irq( IRQ_SUN3_SCSI );
 103
 104
 105 static irqreturn_t scsi_sun3_intr(int irq, void *dummy, struct pt_regs *fp);
 106 static inline unsigned char sun3scsi_read(int reg);
 107 static inline void sun3scsi_write(int reg, int value);
 108
 109 static int setup_can_queue = -1;
 110 module_param(setup_can_queue, int, 0);
 111 static int setup_cmd_per_lun = -1;
 112 module_param(setup_cmd_per_lun, int, 0);
 113 static int setup_sg_tablesize = -1;
 114 module_param(setup_sg_tablesize, int, 0);
 115 #ifdef SUPPORT_TAGS
 116 static int setup_use_tagged_queuing = -1;
 117 module_param(setup_use_tagged_queuing, int, 0);
 118 #endif
 119 static int setup_hostid = -1;
 120 module_param(setup_hostid, int, 0);
 121
 122 static Scsi_Cmnd *sun3_dma_setup_done = NULL;
 123
 124 #define AFTER_RESET_DELAY       (HZ/2)
 125
 126 /* ms to wait after hitting dma regs */
 127 #define SUN3_DMA_DELAY 10
 128
 129 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
 130 #define SUN3_DVMA_BUFSIZE 0xe000
 131
 132 /* minimum number of bytes to do dma on */
 133 #define SUN3_DMA_MINSIZE 128
 134
 135 static volatile unsigned char *sun3_scsi_regp;
 136 static volatile struct sun3_dma_regs *dregs;
 137 #ifdef OLDDMA
 138 static unsigned char *dmabuf = NULL; /* dma memory buffer */
 139 #endif
 140 static struct sun3_udc_regs *udc_regs = NULL;
 141 static unsigned char *sun3_dma_orig_addr = NULL;
 142 static unsigned long sun3_dma_orig_count = 0;
 143 static int sun3_dma_active = 0;
 144 static unsigned long last_residual = 0;
 145
 146 /*
 147  * NCR 5380 register access functions
 148  */
 149
 150 static inline unsigned char sun3scsi_read(int reg)
 151 {
 152         return( sun3_scsi_regp[reg] );
 153 }
 154
 155 static inline void sun3scsi_write(int reg, int value)
 156 {
 157         sun3_scsi_regp[reg] = value;
 158 }
 159
 160 /* dma controller register access functions */
 161
 162 static inline unsigned short sun3_udc_read(unsigned char reg)
 163 {
 164         unsigned short ret;
 165
 166         dregs->udc_addr = UDC_CSR;
 167         udelay(SUN3_DMA_DELAY);
 168         ret = dregs->udc_data;
 169         udelay(SUN3_DMA_DELAY);
 170
 171         return ret;
 172 }
 173
 174 static inline void sun3_udc_write(unsigned short val, unsigned char reg)
 175 {
 176         dregs->udc_addr = reg;
 177         udelay(SUN3_DMA_DELAY);
 178         dregs->udc_data = val;
 179         udelay(SUN3_DMA_DELAY);
 180 }
 181
 182 /*
 183  * XXX: status debug
 184  */
 185 static struct Scsi_Host *default_instance;
 186
 187 /*
 188  * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
 189  *
 190  * Purpose : initializes mac NCR5380 driver based on the
 191  *      command line / compile time port and irq definitions.
 192  *
 193  * Inputs : tpnt - template for this SCSI adapter.
 194  *
 195  * Returns : 1 if a host adapter was found, 0 if not.
 196  *
 197  */
 198
 199 int sun3scsi_detect(struct scsi_host_template * tpnt)
 200 {
 201         unsigned long ioaddr;
 202         static int called = 0;
 203         struct Scsi_Host *instance;
 204
 205         /* check that this machine has an onboard 5380 */
 206         switch(idprom->id_machtype) {
 207         case SM_SUN3|SM_3_50:
 208         case SM_SUN3|SM_3_60:
 209                 break;
 210
 211         default:
 212                 return 0;
 213         }
 214
 215         if(called)
 216                 return 0;
 217
 218         tpnt->proc_name = "Sun3 5380 SCSI";
 219
 220         /* setup variables */
 221         tpnt->can_queue =
 222                 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
 223         tpnt->cmd_per_lun =
 224                 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
 225         tpnt->sg_tablesize =
 226                 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
 227
 228         if (setup_hostid >= 0)
 229                 tpnt->this_id = setup_hostid;
 230         else {
 231                 /* use 7 as default */
 232                 tpnt->this_id = 7;
 233         }
 234
 235         ioaddr = (unsigned long)ioremap(IOBASE_SUN3_SCSI, PAGE_SIZE);
 236         sun3_scsi_regp = (unsigned char *)ioaddr;
 237
 238         dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
 239
 240         if((udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs)))
 241            == NULL) {
 242              printk("SUN3 Scsi couldn't allocate DVMA memory!\n");
 243              return 0;
 244         }
 245 #ifdef OLDDMA
 246         if((dmabuf = dvma_malloc_align(SUN3_DVMA_BUFSIZE, 0x10000)) == NULL) {
 247              printk("SUN3 Scsi couldn't allocate DVMA memory!\n");
 248              return 0;
 249         }
 250 #endif
 251 #ifdef SUPPORT_TAGS
 252         if (setup_use_tagged_queuing < 0)
 253                 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
 254 #endif
 255
 256         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 257         if(instance == NULL)
 258                 return 0;
 259
 260         default_instance = instance;
 261
 262         instance->io_port = (unsigned long) ioaddr;
 263         instance->irq = IRQ_SUN3_SCSI;
 264
 265         NCR5380_init(instance, 0);
 266
 267         instance->n_io_port = 32;
 268
 269         ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
 270
 271         if (request_irq(instance->irq, scsi_sun3_intr,
 272                              0, "Sun3SCSI-5380", NULL)) {
 273 #ifndef REAL_DMA
 274                 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
 275                        instance->host_no, instance->irq);
 276                 instance->irq = SCSI_IRQ_NONE;
 277 #else
 278                 printk("scsi%d: IRQ%d not free, bailing out\n",
 279                        instance->host_no, instance->irq);
 280                 return 0;
 281 #endif
 282         }
 283
 284         printk("scsi%d: Sun3 5380 at port %lX irq", instance->host_no, instance->io_port);
 285         if (instance->irq == SCSI_IRQ_NONE)
 286                 printk ("s disabled");
 287         else
 288                 printk (" %d", instance->irq);
 289         printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 290                instance->can_queue, instance->cmd_per_lun,
 291                SUN3SCSI_PUBLIC_RELEASE);
 292         printk("\nscsi%d:", instance->host_no);
 293         NCR5380_print_options(instance);
 294         printk("\n");
 295
 296         dregs->csr = 0;
 297         udelay(SUN3_DMA_DELAY);
 298         dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
 299         udelay(SUN3_DMA_DELAY);
 300         dregs->fifo_count = 0;
 301
 302         called = 1;
 303
 304 #ifdef RESET_BOOT
 305         sun3_scsi_reset_boot(instance);
 306 #endif
 307
 308         return 1;
 309 }
 310
 311 int sun3scsi_release (struct Scsi_Host *shpnt)
 312 {
 313         if (shpnt->irq != SCSI_IRQ_NONE)
 314                 free_irq (shpnt->irq, NULL);
 315
 316         iounmap((void *)sun3_scsi_regp);
 317
 318         return 0;
 319 }
 320
 321 #ifdef RESET_BOOT
 322 /*
 323  * Our 'bus reset on boot' function
 324  */
 325
 326 static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
 327 {
 328         unsigned long end;
 329
 330         NCR5380_local_declare();
 331         NCR5380_setup(instance);
 332
 333         /*
 334          * Do a SCSI reset to clean up the bus during initialization. No
 335          * messing with the queues, interrupts, or locks necessary here.
 336          */
 337
 338         printk( "Sun3 SCSI: resetting the SCSI bus..." );
 339
 340         /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
 341 //              sun3_disable_irq( IRQ_SUN3_SCSI );
 342
 343         /* get in phase */
 344         NCR5380_write( TARGET_COMMAND_REG,
 345                       PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
 346
 347         /* assert RST */
 348         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
 349
 350         /* The min. reset hold time is 25us, so 40us should be enough */
 351         udelay( 50 );
 352
 353         /* reset RST and interrupt */
 354         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
 355         NCR5380_read( RESET_PARITY_INTERRUPT_REG );
 356
 357         for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
 358                 barrier();
 359
 360         /* switch on SCSI IRQ again */
 361 //              sun3_enable_irq( IRQ_SUN3_SCSI );
 362
 363         printk( " done\n" );
 364 }
 365 #endif
 366
 367 const char * sun3scsi_info (struct Scsi_Host *spnt) {
 368     return "";
 369 }
 370
 371 // safe bits for the CSR
 372 #define CSR_GOOD 0x060f
 373
 374 static irqreturn_t scsi_sun3_intr(int irq, void *dummy, struct pt_regs *fp)
 375 {
 376         unsigned short csr = dregs->csr;
 377         int handled = 0;
 378
 379         if(csr & ~CSR_GOOD) {
 380                 if(csr & CSR_DMA_BUSERR) {
 381                         printk("scsi%d: bus error in dma\n", default_instance->host_no);
 382                 }
 383
 384                 if(csr & CSR_DMA_CONFLICT) {
 385                         printk("scsi%d: dma conflict\n", default_instance->host_no);
 386                 }
 387                 handled = 1;
 388         }
 389
 390         if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
 391                 NCR5380_intr(irq, dummy, fp);
 392                 handled = 1;
 393         }
 394
 395         return IRQ_RETVAL(handled);
 396 }
 397
 398 /*
 399  * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
 400  * reentering NCR5380_print_status seems to have ugly side effects
 401  */
 402
 403 /* this doesn't seem to get used at all -- sam */
 404 #if 0
 405 void sun3_sun3_debug (void)
 406 {
 407         unsigned long flags;
 408         NCR5380_local_declare();
 409
 410         if (default_instance) {
 411                         local_irq_save(flags);
 412                         NCR5380_print_status(default_instance);
 413                         local_irq_restore(flags);
 414         }
 415 }
 416 #endif
 417
 418
 419 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
 420 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
 421 {
 422 #ifdef OLDDMA
 423         if(write_flag)
 424                 memcpy(dmabuf, data, count);
 425         else {
 426                 sun3_dma_orig_addr = data;
 427                 sun3_dma_orig_count = count;
 428         }
 429 #else
 430         void *addr;
 431
 432         if(sun3_dma_orig_addr != NULL)
 433                 dvma_unmap(sun3_dma_orig_addr);
 434
 435 //      addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
 436         addr = (void *)dvma_map((unsigned long) data, count);
 437
 438         sun3_dma_orig_addr = addr;
 439         sun3_dma_orig_count = count;
 440 #endif
 441         dregs->fifo_count = 0;
 442         sun3_udc_write(UDC_RESET, UDC_CSR);
 443
 444         /* reset fifo */
 445         dregs->csr &= ~CSR_FIFO;
 446         dregs->csr |= CSR_FIFO;
 447
 448         /* set direction */
 449         if(write_flag)
 450                 dregs->csr |= CSR_SEND;
 451         else
 452                 dregs->csr &= ~CSR_SEND;
 453
 454         /* byte count for fifo */
 455         dregs->fifo_count = count;
 456
 457         sun3_udc_write(UDC_RESET, UDC_CSR);
 458
 459         /* reset fifo */
 460         dregs->csr &= ~CSR_FIFO;
 461         dregs->csr |= CSR_FIFO;
 462
 463         if(dregs->fifo_count != count) {
 464                 printk("scsi%d: fifo_mismatch %04x not %04x\n",
 465                        default_instance->host_no, dregs->fifo_count,
 466                        (unsigned int) count);
 467                 NCR5380_print(default_instance);
 468         }
 469
 470         /* setup udc */
 471 #ifdef OLDDMA
 472         udc_regs->addr_hi = ((dvma_vtob(dmabuf) & 0xff0000) >> 8);
 473         udc_regs->addr_lo = (dvma_vtob(dmabuf) & 0xffff);
 474 #else
 475         udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8);
 476         udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff);
 477 #endif
 478         udc_regs->count = count/2; /* count in words */
 479         udc_regs->mode_hi = UDC_MODE_HIWORD;
 480         if(write_flag) {
 481                 if(count & 1)
 482                         udc_regs->count++;
 483                 udc_regs->mode_lo = UDC_MODE_LSEND;
 484                 udc_regs->rsel = UDC_RSEL_SEND;
 485         } else {
 486                 udc_regs->mode_lo = UDC_MODE_LRECV;
 487                 udc_regs->rsel = UDC_RSEL_RECV;
 488         }
 489
 490         /* announce location of regs block */
 491         sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8),
 492                        UDC_CHN_HI);
 493
 494         sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO);
 495
 496         /* set dma master on */
 497         sun3_udc_write(0xd, UDC_MODE);
 498
 499         /* interrupt enable */
 500         sun3_udc_write(UDC_INT_ENABLE, UDC_CSR);
 501
 502         return count;
 503
 504 }
 505
 506 static inline unsigned long sun3scsi_dma_count(struct Scsi_Host *instance)
 507 {
 508         unsigned short resid;
 509
 510         dregs->udc_addr = 0x32;
 511         udelay(SUN3_DMA_DELAY);
 512         resid = dregs->udc_data;
 513         udelay(SUN3_DMA_DELAY);
 514         resid *= 2;
 515
 516         return (unsigned long) resid;
 517 }
 518
 519 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
 520 {
 521         return last_residual;
 522 }
 523
 524 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted, Scsi_Cmnd *cmd,
 525                                     int write_flag)
 526 {
 527         if(cmd->request->flags & REQ_CMD)
 528                 return wanted;
 529         else
 530                 return 0;
 531 }
 532
 533 static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data)
 534 {
 535
 536     sun3_udc_write(UDC_CHN_START, UDC_CSR);
 537
 538     return 0;
 539 }
 540
 541 /* clean up after our dma is done */
 542 static int sun3scsi_dma_finish(int write_flag)
 543 {
 544         unsigned short count;
 545         unsigned short fifo;
 546         int ret = 0;
 547
 548         sun3_dma_active = 0;
 549 #if 1
 550         // check to empty the fifo on a read
 551         if(!write_flag) {
 552                 int tmo = 20000; /* .2 sec */
 553
 554                 while(1) {
 555                         if(dregs->csr & CSR_FIFO_EMPTY)
 556                                 break;
 557
 558                         if(--tmo <= 0) {
 559                                 printk("sun3scsi: fifo failed to empty!\n");
 560                                 return 1;
 561                         }
 562                         udelay(10);
 563                 }
 564         }
 565
 566 #endif
 567
 568         count = sun3scsi_dma_count(default_instance);
 569 #ifdef OLDDMA
 570
 571         /* if we've finished a read, copy out the data we read */
 572         if(sun3_dma_orig_addr) {
 573                 /* check for residual bytes after dma end */
 574                 if(count && (NCR5380_read(BUS_AND_STATUS_REG) &
 575                              (BASR_PHASE_MATCH | BASR_ACK))) {
 576                         printk("scsi%d: sun3_scsi_finish: read overrun baby... ", default_instance->host_no);
 577                         printk("basr now %02x\n", NCR5380_read(BUS_AND_STATUS_REG));
 578                         ret = count;
 579                 }
 580
 581                 /* copy in what we dma'd no matter what */
 582                 memcpy(sun3_dma_orig_addr, dmabuf, sun3_dma_orig_count);
 583                 sun3_dma_orig_addr = NULL;
 584
 585         }
 586 #else
 587
 588         fifo = dregs->fifo_count;
 589         last_residual = fifo;
 590
 591         /* empty bytes from the fifo which didn't make it */
 592         if((!write_flag) && (count - fifo) == 2) {
 593                 unsigned short data;
 594                 unsigned char *vaddr;
 595
 596                 data = dregs->fifo_data;
 597                 vaddr = (unsigned char *)dvma_btov(sun3_dma_orig_addr);
 598
 599                 vaddr += (sun3_dma_orig_count - fifo);
 600
 601                 vaddr[-2] = (data & 0xff00) >> 8;
 602                 vaddr[-1] = (data & 0xff);
 603         }
 604
 605         dvma_unmap(sun3_dma_orig_addr);
 606         sun3_dma_orig_addr = NULL;
 607 #endif
 608         sun3_udc_write(UDC_RESET, UDC_CSR);
 609         dregs->fifo_count = 0;
 610         dregs->csr &= ~CSR_SEND;
 611
 612         /* reset fifo */
 613         dregs->csr &= ~CSR_FIFO;
 614         dregs->csr |= CSR_FIFO;
 615
 616         sun3_dma_setup_done = NULL;
 617
 618         return ret;
 619
 620 }
 621
 622 #include "sun3_NCR5380.c"
 623
 624 static struct scsi_host_template driver_template = {
 625         .name                   = SUN3_SCSI_NAME,
 626         .detect                 = sun3scsi_detect,
 627         .release                = sun3scsi_release,
 628         .info                   = sun3scsi_info,
 629         .queuecommand           = sun3scsi_queue_command,
 630         .eh_abort_handler       = sun3scsi_abort,
 631         .eh_bus_reset_handler   = sun3scsi_bus_reset,
 632         .can_queue              = CAN_QUEUE,
 633         .this_id                = 7,
 634         .sg_tablesize           = SG_TABLESIZE,
 635         .cmd_per_lun            = CMD_PER_LUN,
 636         .use_clustering         = DISABLE_CLUSTERING
 637 };
 638
 639
 640 #include "scsi_module.c"
 641
 642 MODULE_LICENSE("GPL");