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/ioport.h>
  62 #include <linux/init.h>
  63 #include <linux/blkdev.h>
  64
  65 #include <asm/io.h>
  66 #include <asm/system.h>
  67
  68 #include <asm/sun3ints.h>
  69 #include <asm/dvma.h>
  70 #include <asm/idprom.h>
  71 #include <asm/machines.h>
  72
  73 /* dma on! */
  74 #define REAL_DMA
  75
  76 #include "scsi.h"
  77 #include "initio.h"
  78 #include <scsi/scsi_host.h>
  79 #include "sun3_scsi.h"
  80
  81 static void NCR5380_print(struct Scsi_Host *instance);
  82
  83 /* #define OLDDMA */
  84
  85 #define USE_WRAPPER
  86 /*#define RESET_BOOT */
  87 #define DRIVER_SETUP
  88
  89 #define NDEBUG 0
  90
  91 /*
  92  * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
  93  */
  94 #ifdef BUG
  95 #undef RESET_BOOT
  96 #undef DRIVER_SETUP
  97 #endif
  98
  99 /* #define SUPPORT_TAGS */
 100
 101 #define ENABLE_IRQ()    enable_irq( IRQ_SUN3_SCSI );
 102
 103
 104 static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
 105 static inline unsigned char sun3scsi_read(int reg);
 106 static inline void sun3scsi_write(int reg, int value);
 107
 108 static int setup_can_queue = -1;
 109 module_param(setup_can_queue, int, 0);
 110 static int setup_cmd_per_lun = -1;
 111 module_param(setup_cmd_per_lun, int, 0);
 112 static int setup_sg_tablesize = -1;
 113 module_param(setup_sg_tablesize, int, 0);
 114 #ifdef SUPPORT_TAGS
 115 static int setup_use_tagged_queuing = -1;
 116 module_param(setup_use_tagged_queuing, int, 0);
 117 #endif
 118 static int setup_hostid = -1;
 119 module_param(setup_hostid, int, 0);
 120
 121 static struct scsi_cmnd *sun3_dma_setup_done = NULL;
 122
 123 #define AFTER_RESET_DELAY       (HZ/2)
 124
 125 /* ms to wait after hitting dma regs */
 126 #define SUN3_DMA_DELAY 10
 127
 128 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
 129 #define SUN3_DVMA_BUFSIZE 0xe000
 130
 131 /* minimum number of bytes to do dma on */
 132 #define SUN3_DMA_MINSIZE 128
 133
 134 static volatile unsigned char *sun3_scsi_regp;
 135 static volatile struct sun3_dma_regs *dregs;
 136 #ifdef OLDDMA
 137 static unsigned char *dmabuf = NULL; /* dma memory buffer */
 138 #endif
 139 static struct sun3_udc_regs *udc_regs = NULL;
 140 static unsigned char *sun3_dma_orig_addr = NULL;
 141 static unsigned long sun3_dma_orig_count = 0;
 142 static int sun3_dma_active = 0;
 143 static unsigned long last_residual = 0;
 144
 145 /*
 146  * NCR 5380 register access functions
 147  */
 148
 149 static inline unsigned char sun3scsi_read(int reg)
 150 {
 151         return( sun3_scsi_regp[reg] );
 152 }
 153
 154 static inline void sun3scsi_write(int reg, int value)
 155 {
 156         sun3_scsi_regp[reg] = value;
 157 }
 158
 159 /* dma controller register access functions */
 160
 161 static inline unsigned short sun3_udc_read(unsigned char reg)
 162 {
 163         unsigned short ret;
 164
 165         dregs->udc_addr = UDC_CSR;
 166         udelay(SUN3_DMA_DELAY);
 167         ret = dregs->udc_data;
 168         udelay(SUN3_DMA_DELAY);
 169
 170         return ret;
 171 }
 172
 173 static inline void sun3_udc_write(unsigned short val, unsigned char reg)
 174 {
 175         dregs->udc_addr = reg;
 176         udelay(SUN3_DMA_DELAY);
 177         dregs->udc_data = val;
 178         udelay(SUN3_DMA_DELAY);
 179 }
 180
 181 /*
 182  * XXX: status debug
 183  */
 184 static struct Scsi_Host *default_instance;
 185
 186 /*
 187  * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
 188  *
 189  * Purpose : initializes mac NCR5380 driver based on the
 190  *      command line / compile time port and irq definitions.
 191  *
 192  * Inputs : tpnt - template for this SCSI adapter.
 193  *
 194  * Returns : 1 if a host adapter was found, 0 if not.
 195  *
 196  */
 197
 198 int sun3scsi_detect(struct scsi_host_template * tpnt)
 199 {
 200         unsigned long ioaddr;
 201         static int called = 0;
 202         struct Scsi_Host *instance;
 203
 204         /* check that this machine has an onboard 5380 */
 205         switch(idprom->id_machtype) {
 206         case SM_SUN3|SM_3_50:
 207         case SM_SUN3|SM_3_60:
 208                 break;
 209
 210         default:
 211                 return 0;
 212         }
 213
 214         if(called)
 215                 return 0;
 216
 217         tpnt->proc_name = "Sun3 5380 SCSI";
 218
 219         /* setup variables */
 220         tpnt->can_queue =
 221                 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
 222         tpnt->cmd_per_lun =
 223                 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
 224         tpnt->sg_tablesize =
 225                 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
 226
 227         if (setup_hostid >= 0)
 228                 tpnt->this_id = setup_hostid;
 229         else {
 230                 /* use 7 as default */
 231                 tpnt->this_id = 7;
 232         }
 233
 234         ioaddr = (unsigned long)ioremap(IOBASE_SUN3_SCSI, PAGE_SIZE);
 235         sun3_scsi_regp = (unsigned char *)ioaddr;
 236
 237         dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
 238
 239         if((udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs)))
 240            == NULL) {
 241              printk("SUN3 Scsi couldn't allocate DVMA memory!\n");
 242              return 0;
 243         }
 244 #ifdef OLDDMA
 245         if((dmabuf = dvma_malloc_align(SUN3_DVMA_BUFSIZE, 0x10000)) == NULL) {
 246              printk("SUN3 Scsi couldn't allocate DVMA memory!\n");
 247              return 0;
 248         }
 249 #endif
 250 #ifdef SUPPORT_TAGS
 251         if (setup_use_tagged_queuing < 0)
 252                 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
 253 #endif
 254
 255         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 256         if(instance == NULL)
 257                 return 0;
 258
 259         default_instance = instance;
 260
 261         instance->io_port = (unsigned long) ioaddr;
 262         instance->irq = IRQ_SUN3_SCSI;
 263
 264         NCR5380_init(instance, 0);
 265
 266         instance->n_io_port = 32;
 267
 268         ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
 269
 270         if (request_irq(instance->irq, scsi_sun3_intr,
 271                              0, "Sun3SCSI-5380", instance)) {
 272 #ifndef REAL_DMA
 273                 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
 274                        instance->host_no, instance->irq);
 275                 instance->irq = SCSI_IRQ_NONE;
 276 #else
 277                 printk("scsi%d: IRQ%d not free, bailing out\n",
 278                        instance->host_no, instance->irq);
 279                 return 0;
 280 #endif
 281         }
 282
 283         printk("scsi%d: Sun3 5380 at port %lX irq", instance->host_no, instance->io_port);
 284         if (instance->irq == SCSI_IRQ_NONE)
 285                 printk ("s disabled");
 286         else
 287                 printk (" %d", instance->irq);
 288         printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 289                instance->can_queue, instance->cmd_per_lun,
 290                SUN3SCSI_PUBLIC_RELEASE);
 291         printk("\nscsi%d:", instance->host_no);
 292         NCR5380_print_options(instance);
 293         printk("\n");
 294
 295         dregs->csr = 0;
 296         udelay(SUN3_DMA_DELAY);
 297         dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
 298         udelay(SUN3_DMA_DELAY);
 299         dregs->fifo_count = 0;
 300
 301         called = 1;
 302
 303 #ifdef RESET_BOOT
 304         sun3_scsi_reset_boot(instance);
 305 #endif
 306
 307         return 1;
 308 }
 309
 310 int sun3scsi_release (struct Scsi_Host *shpnt)
 311 {
 312         if (shpnt->irq != SCSI_IRQ_NONE)
 313                 free_irq(shpnt->irq, shpnt);
 314
 315         iounmap((void *)sun3_scsi_regp);
 316
 317         return 0;
 318 }
 319
 320 #ifdef RESET_BOOT
 321 /*
 322  * Our 'bus reset on boot' function
 323  */
 324
 325 static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
 326 {
 327         unsigned long end;
 328
 329         NCR5380_local_declare();
 330         NCR5380_setup(instance);
 331
 332         /*
 333          * Do a SCSI reset to clean up the bus during initialization. No
 334          * messing with the queues, interrupts, or locks necessary here.
 335          */
 336
 337         printk( "Sun3 SCSI: resetting the SCSI bus..." );
 338
 339         /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
 340 //              sun3_disable_irq( IRQ_SUN3_SCSI );
 341
 342         /* get in phase */
 343         NCR5380_write( TARGET_COMMAND_REG,
 344                       PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
 345
 346         /* assert RST */
 347         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
 348
 349         /* The min. reset hold time is 25us, so 40us should be enough */
 350         udelay( 50 );
 351
 352         /* reset RST and interrupt */
 353         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
 354         NCR5380_read( RESET_PARITY_INTERRUPT_REG );
 355
 356         for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
 357                 barrier();
 358
 359         /* switch on SCSI IRQ again */
 360 //              sun3_enable_irq( IRQ_SUN3_SCSI );
 361
 362         printk( " done\n" );
 363 }
 364 #endif
 365
 366 const char * sun3scsi_info (struct Scsi_Host *spnt) {
 367     return "";
 368 }
 369
 370 // safe bits for the CSR
 371 #define CSR_GOOD 0x060f
 372
 373 static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
 374 {
 375         unsigned short csr = dregs->csr;
 376         int handled = 0;
 377
 378         if(csr & ~CSR_GOOD) {
 379                 if(csr & CSR_DMA_BUSERR) {
 380                         printk("scsi%d: bus error in dma\n", default_instance->host_no);
 381                 }
 382
 383                 if(csr & CSR_DMA_CONFLICT) {
 384                         printk("scsi%d: dma conflict\n", default_instance->host_no);
 385                 }
 386                 handled = 1;
 387         }
 388
 389         if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
 390                 NCR5380_intr(irq, dummy);
 391                 handled = 1;
 392         }
 393
 394         return IRQ_RETVAL(handled);
 395 }
 396
 397 /*
 398  * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
 399  * reentering NCR5380_print_status seems to have ugly side effects
 400  */
 401
 402 /* this doesn't seem to get used at all -- sam */
 403 #if 0
 404 void sun3_sun3_debug (void)
 405 {
 406         unsigned long flags;
 407         NCR5380_local_declare();
 408
 409         if (default_instance) {
 410                         local_irq_save(flags);
 411                         NCR5380_print_status(default_instance);
 412                         local_irq_restore(flags);
 413         }
 414 }
 415 #endif
 416
 417
 418 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
 419 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
 420 {
 421 #ifdef OLDDMA
 422         if(write_flag)
 423                 memcpy(dmabuf, data, count);
 424         else {
 425                 sun3_dma_orig_addr = data;
 426                 sun3_dma_orig_count = count;
 427         }
 428 #else
 429         void *addr;
 430
 431         if(sun3_dma_orig_addr != NULL)
 432                 dvma_unmap(sun3_dma_orig_addr);
 433
 434 //      addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
 435         addr = (void *)dvma_map((unsigned long) data, count);
 436
 437         sun3_dma_orig_addr = addr;
 438         sun3_dma_orig_count = count;
 439 #endif
 440         dregs->fifo_count = 0;
 441         sun3_udc_write(UDC_RESET, UDC_CSR);
 442
 443         /* reset fifo */
 444         dregs->csr &= ~CSR_FIFO;
 445         dregs->csr |= CSR_FIFO;
 446
 447         /* set direction */
 448         if(write_flag)
 449                 dregs->csr |= CSR_SEND;
 450         else
 451                 dregs->csr &= ~CSR_SEND;
 452
 453         /* byte count for fifo */
 454         dregs->fifo_count = count;
 455
 456         sun3_udc_write(UDC_RESET, UDC_CSR);
 457
 458         /* reset fifo */
 459         dregs->csr &= ~CSR_FIFO;
 460         dregs->csr |= CSR_FIFO;
 461
 462         if(dregs->fifo_count != count) {
 463                 printk("scsi%d: fifo_mismatch %04x not %04x\n",
 464                        default_instance->host_no, dregs->fifo_count,
 465                        (unsigned int) count);
 466                 NCR5380_print(default_instance);
 467         }
 468
 469         /* setup udc */
 470 #ifdef OLDDMA
 471         udc_regs->addr_hi = ((dvma_vtob(dmabuf) & 0xff0000) >> 8);
 472         udc_regs->addr_lo = (dvma_vtob(dmabuf) & 0xffff);
 473 #else
 474         udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8);
 475         udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff);
 476 #endif
 477         udc_regs->count = count/2; /* count in words */
 478         udc_regs->mode_hi = UDC_MODE_HIWORD;
 479         if(write_flag) {
 480                 if(count & 1)
 481                         udc_regs->count++;
 482                 udc_regs->mode_lo = UDC_MODE_LSEND;
 483                 udc_regs->rsel = UDC_RSEL_SEND;
 484         } else {
 485                 udc_regs->mode_lo = UDC_MODE_LRECV;
 486                 udc_regs->rsel = UDC_RSEL_RECV;
 487         }
 488
 489         /* announce location of regs block */
 490         sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8),
 491                        UDC_CHN_HI);
 492
 493         sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO);
 494
 495         /* set dma master on */
 496         sun3_udc_write(0xd, UDC_MODE);
 497
 498         /* interrupt enable */
 499         sun3_udc_write(UDC_INT_ENABLE, UDC_CSR);
 500
 501         return count;
 502
 503 }
 504
 505 static inline unsigned long sun3scsi_dma_count(struct Scsi_Host *instance)
 506 {
 507         unsigned short resid;
 508
 509         dregs->udc_addr = 0x32;
 510         udelay(SUN3_DMA_DELAY);
 511         resid = dregs->udc_data;
 512         udelay(SUN3_DMA_DELAY);
 513         resid *= 2;
 514
 515         return (unsigned long) resid;
 516 }
 517
 518 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
 519 {
 520         return last_residual;
 521 }
 522
 523 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
 524                                                   struct scsi_cmnd *cmd,
 525                                                   int write_flag)
 526 {
 527         if (cmd->request->cmd_type == REQ_TYPE_FS)
 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");