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
  67 #include <asm/sun3ints.h>
  68 #include <asm/dvma.h>
  69 #include <asm/idprom.h>
  70 #include <asm/machines.h>
  71
  72 #define NDEBUG 0
  73
  74 #define NDEBUG_ABORT            0x00100000
  75 #define NDEBUG_TAGS             0x00200000
  76 #define NDEBUG_MERGING          0x00400000
  77
  78 /* dma on! */
  79 #define REAL_DMA
  80
  81 #include "scsi.h"
  82 #include "initio.h"
  83 #include <scsi/scsi_host.h>
  84 #include "sun3_scsi.h"
  85
  86 static void NCR5380_print(struct Scsi_Host *instance);
  87
  88 /* #define OLDDMA */
  89
  90 #define USE_WRAPPER
  91 /*#define RESET_BOOT */
  92 #define DRIVER_SETUP
  93
  94 /*
  95  * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
  96  */
  97 #ifdef BUG
  98 #undef RESET_BOOT
  99 #undef DRIVER_SETUP
 100 #endif
 101
 102 /* #define SUPPORT_TAGS */
 103
 104 #define ENABLE_IRQ()    enable_irq( IRQ_SUN3_SCSI );
 105
 106
 107 static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
 108 static inline unsigned char sun3scsi_read(int reg);
 109 static inline void sun3scsi_write(int reg, int value);
 110
 111 static int setup_can_queue = -1;
 112 module_param(setup_can_queue, int, 0);
 113 static int setup_cmd_per_lun = -1;
 114 module_param(setup_cmd_per_lun, int, 0);
 115 static int setup_sg_tablesize = -1;
 116 module_param(setup_sg_tablesize, int, 0);
 117 #ifdef SUPPORT_TAGS
 118 static int setup_use_tagged_queuing = -1;
 119 module_param(setup_use_tagged_queuing, int, 0);
 120 #endif
 121 static int setup_hostid = -1;
 122 module_param(setup_hostid, int, 0);
 123
 124 static struct scsi_cmnd *sun3_dma_setup_done = NULL;
 125
 126 #define AFTER_RESET_DELAY       (HZ/2)
 127
 128 /* ms to wait after hitting dma regs */
 129 #define SUN3_DMA_DELAY 10
 130
 131 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
 132 #define SUN3_DVMA_BUFSIZE 0xe000
 133
 134 /* minimum number of bytes to do dma on */
 135 #define SUN3_DMA_MINSIZE 128
 136
 137 static volatile unsigned char *sun3_scsi_regp;
 138 static volatile struct sun3_dma_regs *dregs;
 139 #ifdef OLDDMA
 140 static unsigned char *dmabuf = NULL; /* dma memory buffer */
 141 #endif
 142 static struct sun3_udc_regs *udc_regs = NULL;
 143 static unsigned char *sun3_dma_orig_addr = NULL;
 144 static unsigned long sun3_dma_orig_count = 0;
 145 static int sun3_dma_active = 0;
 146 static unsigned long last_residual = 0;
 147
 148 /*
 149  * NCR 5380 register access functions
 150  */
 151
 152 static inline unsigned char sun3scsi_read(int reg)
 153 {
 154         return( sun3_scsi_regp[reg] );
 155 }
 156
 157 static inline void sun3scsi_write(int reg, int value)
 158 {
 159         sun3_scsi_regp[reg] = value;
 160 }
 161
 162 /* dma controller register access functions */
 163
 164 static inline unsigned short sun3_udc_read(unsigned char reg)
 165 {
 166         unsigned short ret;
 167
 168         dregs->udc_addr = UDC_CSR;
 169         udelay(SUN3_DMA_DELAY);
 170         ret = dregs->udc_data;
 171         udelay(SUN3_DMA_DELAY);
 172
 173         return ret;
 174 }
 175
 176 static inline void sun3_udc_write(unsigned short val, unsigned char reg)
 177 {
 178         dregs->udc_addr = reg;
 179         udelay(SUN3_DMA_DELAY);
 180         dregs->udc_data = val;
 181         udelay(SUN3_DMA_DELAY);
 182 }
 183
 184 /*
 185  * XXX: status debug
 186  */
 187 static struct Scsi_Host *default_instance;
 188
 189 /*
 190  * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
 191  *
 192  * Purpose : initializes mac NCR5380 driver based on the
 193  *      command line / compile time port and irq definitions.
 194  *
 195  * Inputs : tpnt - template for this SCSI adapter.
 196  *
 197  * Returns : 1 if a host adapter was found, 0 if not.
 198  *
 199  */
 200
 201 int __init sun3scsi_detect(struct scsi_host_template * tpnt)
 202 {
 203         unsigned long ioaddr;
 204         static int called = 0;
 205         struct Scsi_Host *instance;
 206
 207         /* check that this machine has an onboard 5380 */
 208         switch(idprom->id_machtype) {
 209         case SM_SUN3|SM_3_50:
 210         case SM_SUN3|SM_3_60:
 211                 break;
 212
 213         default:
 214                 return 0;
 215         }
 216
 217         if(called)
 218                 return 0;
 219
 220         tpnt->proc_name = "Sun3 5380 SCSI";
 221
 222         /* setup variables */
 223         tpnt->can_queue =
 224                 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
 225         tpnt->cmd_per_lun =
 226                 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
 227         tpnt->sg_tablesize =
 228                 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
 229
 230         if (setup_hostid >= 0)
 231                 tpnt->this_id = setup_hostid;
 232         else {
 233                 /* use 7 as default */
 234                 tpnt->this_id = 7;
 235         }
 236
 237         ioaddr = (unsigned long)ioremap(IOBASE_SUN3_SCSI, PAGE_SIZE);
 238         sun3_scsi_regp = (unsigned char *)ioaddr;
 239
 240         dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
 241
 242         if((udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs)))
 243            == NULL) {
 244              printk("SUN3 Scsi couldn't allocate DVMA memory!\n");
 245              return 0;
 246         }
 247 #ifdef OLDDMA
 248         if((dmabuf = dvma_malloc_align(SUN3_DVMA_BUFSIZE, 0x10000)) == NULL) {
 249              printk("SUN3 Scsi couldn't allocate DVMA memory!\n");
 250              return 0;
 251         }
 252 #endif
 253 #ifdef SUPPORT_TAGS
 254         if (setup_use_tagged_queuing < 0)
 255                 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
 256 #endif
 257
 258         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 259         if(instance == NULL)
 260                 return 0;
 261
 262         default_instance = instance;
 263
 264         instance->io_port = (unsigned long) ioaddr;
 265         instance->irq = IRQ_SUN3_SCSI;
 266
 267         NCR5380_init(instance, 0);
 268
 269         instance->n_io_port = 32;
 270
 271         ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
 272
 273         if (request_irq(instance->irq, scsi_sun3_intr,
 274                              0, "Sun3SCSI-5380", instance)) {
 275 #ifndef REAL_DMA
 276                 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
 277                        instance->host_no, instance->irq);
 278                 instance->irq = SCSI_IRQ_NONE;
 279 #else
 280                 printk("scsi%d: IRQ%d not free, bailing out\n",
 281                        instance->host_no, instance->irq);
 282                 return 0;
 283 #endif
 284         }
 285
 286         printk("scsi%d: Sun3 5380 at port %lX irq", instance->host_no, instance->io_port);
 287         if (instance->irq == SCSI_IRQ_NONE)
 288                 printk ("s disabled");
 289         else
 290                 printk (" %d", instance->irq);
 291         printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 292                instance->can_queue, instance->cmd_per_lun,
 293                SUN3SCSI_PUBLIC_RELEASE);
 294         printk("\nscsi%d:", instance->host_no);
 295         NCR5380_print_options(instance);
 296         printk("\n");
 297
 298         dregs->csr = 0;
 299         udelay(SUN3_DMA_DELAY);
 300         dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
 301         udelay(SUN3_DMA_DELAY);
 302         dregs->fifo_count = 0;
 303
 304         called = 1;
 305
 306 #ifdef RESET_BOOT
 307         sun3_scsi_reset_boot(instance);
 308 #endif
 309
 310         return 1;
 311 }
 312
 313 int sun3scsi_release (struct Scsi_Host *shpnt)
 314 {
 315         if (shpnt->irq != SCSI_IRQ_NONE)
 316                 free_irq(shpnt->irq, shpnt);
 317
 318         iounmap((void *)sun3_scsi_regp);
 319
 320         NCR5380_exit(shpnt);
 321         return 0;
 322 }
 323
 324 #ifdef RESET_BOOT
 325 /*
 326  * Our 'bus reset on boot' function
 327  */
 328
 329 static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
 330 {
 331         unsigned long end;
 332
 333         NCR5380_local_declare();
 334         NCR5380_setup(instance);
 335
 336         /*
 337          * Do a SCSI reset to clean up the bus during initialization. No
 338          * messing with the queues, interrupts, or locks necessary here.
 339          */
 340
 341         printk( "Sun3 SCSI: resetting the SCSI bus..." );
 342
 343         /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
 344 //              sun3_disable_irq( IRQ_SUN3_SCSI );
 345
 346         /* get in phase */
 347         NCR5380_write( TARGET_COMMAND_REG,
 348                       PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
 349
 350         /* assert RST */
 351         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
 352
 353         /* The min. reset hold time is 25us, so 40us should be enough */
 354         udelay( 50 );
 355
 356         /* reset RST and interrupt */
 357         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
 358         NCR5380_read( RESET_PARITY_INTERRUPT_REG );
 359
 360         for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
 361                 barrier();
 362
 363         /* switch on SCSI IRQ again */
 364 //              sun3_enable_irq( IRQ_SUN3_SCSI );
 365
 366         printk( " done\n" );
 367 }
 368 #endif
 369
 370 const char * sun3scsi_info (struct Scsi_Host *spnt) {
 371     return "";
 372 }
 373
 374 // safe bits for the CSR
 375 #define CSR_GOOD 0x060f
 376
 377 static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
 378 {
 379         unsigned short csr = dregs->csr;
 380         int handled = 0;
 381
 382         if(csr & ~CSR_GOOD) {
 383                 if(csr & CSR_DMA_BUSERR) {
 384                         printk("scsi%d: bus error in dma\n", default_instance->host_no);
 385                 }
 386
 387                 if(csr & CSR_DMA_CONFLICT) {
 388                         printk("scsi%d: dma conflict\n", default_instance->host_no);
 389                 }
 390                 handled = 1;
 391         }
 392
 393         if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
 394                 NCR5380_intr(irq, dummy);
 395                 handled = 1;
 396         }
 397
 398         return IRQ_RETVAL(handled);
 399 }
 400
 401 /*
 402  * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
 403  * reentering NCR5380_print_status seems to have ugly side effects
 404  */
 405
 406 /* this doesn't seem to get used at all -- sam */
 407 #if 0
 408 void sun3_sun3_debug (void)
 409 {
 410         unsigned long flags;
 411         NCR5380_local_declare();
 412
 413         if (default_instance) {
 414                         local_irq_save(flags);
 415                         NCR5380_print_status(default_instance);
 416                         local_irq_restore(flags);
 417         }
 418 }
 419 #endif
 420
 421
 422 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
 423 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
 424 {
 425 #ifdef OLDDMA
 426         if(write_flag)
 427                 memcpy(dmabuf, data, count);
 428         else {
 429                 sun3_dma_orig_addr = data;
 430                 sun3_dma_orig_count = count;
 431         }
 432 #else
 433         void *addr;
 434
 435         if(sun3_dma_orig_addr != NULL)
 436                 dvma_unmap(sun3_dma_orig_addr);
 437
 438 //      addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
 439         addr = (void *)dvma_map((unsigned long) data, count);
 440
 441         sun3_dma_orig_addr = addr;
 442         sun3_dma_orig_count = count;
 443 #endif
 444         dregs->fifo_count = 0;
 445         sun3_udc_write(UDC_RESET, UDC_CSR);
 446
 447         /* reset fifo */
 448         dregs->csr &= ~CSR_FIFO;
 449         dregs->csr |= CSR_FIFO;
 450
 451         /* set direction */
 452         if(write_flag)
 453                 dregs->csr |= CSR_SEND;
 454         else
 455                 dregs->csr &= ~CSR_SEND;
 456
 457         /* byte count for fifo */
 458         dregs->fifo_count = count;
 459
 460         sun3_udc_write(UDC_RESET, UDC_CSR);
 461
 462         /* reset fifo */
 463         dregs->csr &= ~CSR_FIFO;
 464         dregs->csr |= CSR_FIFO;
 465
 466         if(dregs->fifo_count != count) {
 467                 printk("scsi%d: fifo_mismatch %04x not %04x\n",
 468                        default_instance->host_no, dregs->fifo_count,
 469                        (unsigned int) count);
 470                 NCR5380_print(default_instance);
 471         }
 472
 473         /* setup udc */
 474 #ifdef OLDDMA
 475         udc_regs->addr_hi = ((dvma_vtob(dmabuf) & 0xff0000) >> 8);
 476         udc_regs->addr_lo = (dvma_vtob(dmabuf) & 0xffff);
 477 #else
 478         udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8);
 479         udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff);
 480 #endif
 481         udc_regs->count = count/2; /* count in words */
 482         udc_regs->mode_hi = UDC_MODE_HIWORD;
 483         if(write_flag) {
 484                 if(count & 1)
 485                         udc_regs->count++;
 486                 udc_regs->mode_lo = UDC_MODE_LSEND;
 487                 udc_regs->rsel = UDC_RSEL_SEND;
 488         } else {
 489                 udc_regs->mode_lo = UDC_MODE_LRECV;
 490                 udc_regs->rsel = UDC_RSEL_RECV;
 491         }
 492
 493         /* announce location of regs block */
 494         sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8),
 495                        UDC_CHN_HI);
 496
 497         sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO);
 498
 499         /* set dma master on */
 500         sun3_udc_write(0xd, UDC_MODE);
 501
 502         /* interrupt enable */
 503         sun3_udc_write(UDC_INT_ENABLE, UDC_CSR);
 504
 505         return count;
 506
 507 }
 508
 509 static inline unsigned long sun3scsi_dma_count(struct Scsi_Host *instance)
 510 {
 511         unsigned short resid;
 512
 513         dregs->udc_addr = 0x32;
 514         udelay(SUN3_DMA_DELAY);
 515         resid = dregs->udc_data;
 516         udelay(SUN3_DMA_DELAY);
 517         resid *= 2;
 518
 519         return (unsigned long) resid;
 520 }
 521
 522 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
 523 {
 524         return last_residual;
 525 }
 526
 527 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
 528                                                   struct scsi_cmnd *cmd,
 529                                                   int write_flag)
 530 {
 531         if (cmd->request->cmd_type == REQ_TYPE_FS)
 532                 return wanted;
 533         else
 534                 return 0;
 535 }
 536
 537 static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data)
 538 {
 539
 540     sun3_udc_write(UDC_CHN_START, UDC_CSR);
 541
 542     return 0;
 543 }
 544
 545 /* clean up after our dma is done */
 546 static int sun3scsi_dma_finish(int write_flag)
 547 {
 548         unsigned short count;
 549         unsigned short fifo;
 550         int ret = 0;
 551
 552         sun3_dma_active = 0;
 553 #if 1
 554         // check to empty the fifo on a read
 555         if(!write_flag) {
 556                 int tmo = 20000; /* .2 sec */
 557
 558                 while(1) {
 559                         if(dregs->csr & CSR_FIFO_EMPTY)
 560                                 break;
 561
 562                         if(--tmo <= 0) {
 563                                 printk("sun3scsi: fifo failed to empty!\n");
 564                                 return 1;
 565                         }
 566                         udelay(10);
 567                 }
 568         }
 569
 570 #endif
 571
 572         count = sun3scsi_dma_count(default_instance);
 573 #ifdef OLDDMA
 574
 575         /* if we've finished a read, copy out the data we read */
 576         if(sun3_dma_orig_addr) {
 577                 /* check for residual bytes after dma end */
 578                 if(count && (NCR5380_read(BUS_AND_STATUS_REG) &
 579                              (BASR_PHASE_MATCH | BASR_ACK))) {
 580                         printk("scsi%d: sun3_scsi_finish: read overrun baby... ", default_instance->host_no);
 581                         printk("basr now %02x\n", NCR5380_read(BUS_AND_STATUS_REG));
 582                         ret = count;
 583                 }
 584
 585                 /* copy in what we dma'd no matter what */
 586                 memcpy(sun3_dma_orig_addr, dmabuf, sun3_dma_orig_count);
 587                 sun3_dma_orig_addr = NULL;
 588
 589         }
 590 #else
 591
 592         fifo = dregs->fifo_count;
 593         last_residual = fifo;
 594
 595         /* empty bytes from the fifo which didn't make it */
 596         if((!write_flag) && (count - fifo) == 2) {
 597                 unsigned short data;
 598                 unsigned char *vaddr;
 599
 600                 data = dregs->fifo_data;
 601                 vaddr = (unsigned char *)dvma_btov(sun3_dma_orig_addr);
 602
 603                 vaddr += (sun3_dma_orig_count - fifo);
 604
 605                 vaddr[-2] = (data & 0xff00) >> 8;
 606                 vaddr[-1] = (data & 0xff);
 607         }
 608
 609         dvma_unmap(sun3_dma_orig_addr);
 610         sun3_dma_orig_addr = NULL;
 611 #endif
 612         sun3_udc_write(UDC_RESET, UDC_CSR);
 613         dregs->fifo_count = 0;
 614         dregs->csr &= ~CSR_SEND;
 615
 616         /* reset fifo */
 617         dregs->csr &= ~CSR_FIFO;
 618         dregs->csr |= CSR_FIFO;
 619
 620         sun3_dma_setup_done = NULL;
 621
 622         return ret;
 623
 624 }
 625
 626 #include "sun3_NCR5380.c"
 627
 628 static struct scsi_host_template driver_template = {
 629         .name                   = SUN3_SCSI_NAME,
 630         .detect                 = sun3scsi_detect,
 631         .release                = sun3scsi_release,
 632         .info                   = sun3scsi_info,
 633         .queuecommand           = sun3scsi_queue_command,
 634         .eh_abort_handler       = sun3scsi_abort,
 635         .eh_bus_reset_handler   = sun3scsi_bus_reset,
 636         .can_queue              = CAN_QUEUE,
 637         .this_id                = 7,
 638         .sg_tablesize           = SG_TABLESIZE,
 639         .cmd_per_lun            = CMD_PER_LUN,
 640         .use_clustering         = DISABLE_CLUSTERING
 641 };
 642
 643
 644 #include "scsi_module.c"
 645
 646 MODULE_LICENSE("GPL");