drivers/scsi/sun3_scsi_vme.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  * VME support added by Sam Creasey
   7  *
   8  * Adapted from sun3_scsi.c -- see there for other headers
   9  *
  10  * TODO: modify this driver to support multiple Sun3 SCSI VME boards
  11  *
  12  */
  13
  14 #define AUTOSENSE
  15
  16 #include <linux/types.h>
  17 #include <linux/stddef.h>
  18 #include <linux/ctype.h>
  19 #include <linux/delay.h>
  20
  21 #include <linux/module.h>
  22 #include <linux/signal.h>
  23 #include <linux/sched.h>
  24 #include <linux/ioport.h>
  25 #include <linux/init.h>
  26 #include <linux/blkdev.h>
  27
  28 #include <asm/io.h>
  29 #include <asm/system.h>
  30
  31 #include <asm/sun3ints.h>
  32 #include <asm/dvma.h>
  33 #include <asm/idprom.h>
  34 #include <asm/machines.h>
  35
  36 #define SUN3_SCSI_VME
  37
  38 #undef SUN3_SCSI_DEBUG
  39
  40 /* dma on! */
  41 #define REAL_DMA
  42
  43 #include "scsi.h"
  44 #include "initio.h"
  45 #include <scsi/scsi_host.h>
  46 #include "sun3_scsi.h"
  47
  48 extern int sun3_map_test(unsigned long, char *);
  49
  50 #define USE_WRAPPER
  51 /*#define RESET_BOOT */
  52 #define DRIVER_SETUP
  53
  54 #define NDEBUG 0
  55
  56 /*
  57  * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
  58  */
  59 #ifdef BUG
  60 #undef RESET_BOOT
  61 #undef DRIVER_SETUP
  62 #endif
  63
  64 /* #define SUPPORT_TAGS */
  65
  66 //#define       ENABLE_IRQ()    enable_irq( SUN3_VEC_VMESCSI0 );
  67 #define ENABLE_IRQ()
  68
  69
  70 static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
  71 static inline unsigned char sun3scsi_read(int reg);
  72 static inline void sun3scsi_write(int reg, int value);
  73
  74 static int setup_can_queue = -1;
  75 module_param(setup_can_queue, int, 0);
  76 static int setup_cmd_per_lun = -1;
  77 module_param(setup_cmd_per_lun, int, 0);
  78 static int setup_sg_tablesize = -1;
  79 module_param(setup_sg_tablesize, int, 0);
  80 #ifdef SUPPORT_TAGS
  81 static int setup_use_tagged_queuing = -1;
  82 module_param(setup_use_tagged_queuing, int, 0);
  83 #endif
  84 static int setup_hostid = -1;
  85 module_param(setup_hostid, int, 0);
  86
  87 static struct scsi_cmnd *sun3_dma_setup_done = NULL;
  88
  89 #define AFTER_RESET_DELAY       (HZ/2)
  90
  91 /* ms to wait after hitting dma regs */
  92 #define SUN3_DMA_DELAY 10
  93
  94 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
  95 #define SUN3_DVMA_BUFSIZE 0xe000
  96
  97 /* minimum number of bytes to do dma on */
  98 #define SUN3_DMA_MINSIZE 128
  99
 100 static volatile unsigned char *sun3_scsi_regp;
 101 static volatile struct sun3_dma_regs *dregs;
 102 #ifdef OLDDMA
 103 static unsigned char *dmabuf = NULL; /* dma memory buffer */
 104 #endif
 105 static unsigned char *sun3_dma_orig_addr = NULL;
 106 static unsigned long sun3_dma_orig_count = 0;
 107 static int sun3_dma_active = 0;
 108 static unsigned long last_residual = 0;
 109
 110 /*
 111  * NCR 5380 register access functions
 112  */
 113
 114 static inline unsigned char sun3scsi_read(int reg)
 115 {
 116         return( sun3_scsi_regp[reg] );
 117 }
 118
 119 static inline void sun3scsi_write(int reg, int value)
 120 {
 121         sun3_scsi_regp[reg] = value;
 122 }
 123
 124 /*
 125  * XXX: status debug
 126  */
 127 static struct Scsi_Host *default_instance;
 128
 129 /*
 130  * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
 131  *
 132  * Purpose : initializes mac NCR5380 driver based on the
 133  *      command line / compile time port and irq definitions.
 134  *
 135  * Inputs : tpnt - template for this SCSI adapter.
 136  *
 137  * Returns : 1 if a host adapter was found, 0 if not.
 138  *
 139  */
 140
 141 static int sun3scsi_detect(struct scsi_host_template * tpnt)
 142 {
 143         unsigned long ioaddr, irq = 0;
 144         static int called = 0;
 145         struct Scsi_Host *instance;
 146         int i;
 147         unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI,
 148                                    IOBASE_SUN3_VMESCSI + 0x4000,
 149                                    0 };
 150         unsigned long vecs[3] = { SUN3_VEC_VMESCSI0,
 151                                   SUN3_VEC_VMESCSI1,
 152                                   0 };
 153         /* check that this machine has an onboard 5380 */
 154         switch(idprom->id_machtype) {
 155         case SM_SUN3|SM_3_160:
 156         case SM_SUN3|SM_3_260:
 157                 break;
 158
 159         default:
 160                 return 0;
 161         }
 162
 163         if(called)
 164                 return 0;
 165
 166         tpnt->proc_name = "Sun3 5380 VME SCSI";
 167
 168         /* setup variables */
 169         tpnt->can_queue =
 170                 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
 171         tpnt->cmd_per_lun =
 172                 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
 173         tpnt->sg_tablesize =
 174                 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
 175
 176         if (setup_hostid >= 0)
 177                 tpnt->this_id = setup_hostid;
 178         else {
 179                 /* use 7 as default */
 180                 tpnt->this_id = 7;
 181         }
 182
 183         ioaddr = 0;
 184         for(i = 0; addrs[i] != 0; i++) {
 185                 unsigned char x;
 186
 187                 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE,
 188                                                      SUN3_PAGE_TYPE_VME16);
 189                 irq = vecs[i];
 190                 sun3_scsi_regp = (unsigned char *)ioaddr;
 191
 192                 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
 193
 194                 if(sun3_map_test((unsigned long)dregs, &x)) {
 195                         unsigned short oldcsr;
 196
 197                         oldcsr = dregs->csr;
 198                         dregs->csr = 0;
 199                         udelay(SUN3_DMA_DELAY);
 200                         if(dregs->csr == 0x1400)
 201                                 break;
 202
 203                         dregs->csr = oldcsr;
 204                 }
 205
 206                 iounmap((void *)ioaddr);
 207                 ioaddr = 0;
 208         }
 209
 210         if(!ioaddr)
 211                 return 0;
 212
 213 #ifdef SUPPORT_TAGS
 214         if (setup_use_tagged_queuing < 0)
 215                 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
 216 #endif
 217
 218         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 219         if(instance == NULL)
 220                 return 0;
 221
 222         default_instance = instance;
 223
 224         instance->io_port = (unsigned long) ioaddr;
 225         instance->irq = irq;
 226
 227         NCR5380_init(instance, 0);
 228
 229         instance->n_io_port = 32;
 230
 231         ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
 232
 233         if (request_irq(instance->irq, scsi_sun3_intr,
 234                              0, "Sun3SCSI-5380VME", NULL)) {
 235 #ifndef REAL_DMA
 236                 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
 237                        instance->host_no, instance->irq);
 238                 instance->irq = SCSI_IRQ_NONE;
 239 #else
 240                 printk("scsi%d: IRQ%d not free, bailing out\n",
 241                        instance->host_no, instance->irq);
 242                 return 0;
 243 #endif
 244         }
 245
 246         printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port);
 247         if (instance->irq == SCSI_IRQ_NONE)
 248                 printk ("s disabled");
 249         else
 250                 printk (" %d", instance->irq);
 251         printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 252                instance->can_queue, instance->cmd_per_lun,
 253                SUN3SCSI_PUBLIC_RELEASE);
 254         printk("\nscsi%d:", instance->host_no);
 255         NCR5380_print_options(instance);
 256         printk("\n");
 257
 258         dregs->csr = 0;
 259         udelay(SUN3_DMA_DELAY);
 260         dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
 261         udelay(SUN3_DMA_DELAY);
 262         dregs->fifo_count = 0;
 263         dregs->fifo_count_hi = 0;
 264         dregs->dma_addr_hi = 0;
 265         dregs->dma_addr_lo = 0;
 266         dregs->dma_count_hi = 0;
 267         dregs->dma_count_lo = 0;
 268
 269         dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
 270
 271         called = 1;
 272
 273 #ifdef RESET_BOOT
 274         sun3_scsi_reset_boot(instance);
 275 #endif
 276
 277         return 1;
 278 }
 279
 280 int sun3scsi_release (struct Scsi_Host *shpnt)
 281 {
 282         if (shpnt->irq != SCSI_IRQ_NONE)
 283                 free_irq (shpnt->irq, NULL);
 284
 285         iounmap((void *)sun3_scsi_regp);
 286
 287         return 0;
 288 }
 289
 290 #ifdef RESET_BOOT
 291 /*
 292  * Our 'bus reset on boot' function
 293  */
 294
 295 static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
 296 {
 297         unsigned long end;
 298
 299         NCR5380_local_declare();
 300         NCR5380_setup(instance);
 301
 302         /*
 303          * Do a SCSI reset to clean up the bus during initialization. No
 304          * messing with the queues, interrupts, or locks necessary here.
 305          */
 306
 307         printk( "Sun3 SCSI: resetting the SCSI bus..." );
 308
 309         /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
 310 //              sun3_disable_irq( IRQ_SUN3_SCSI );
 311
 312         /* get in phase */
 313         NCR5380_write( TARGET_COMMAND_REG,
 314                       PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
 315
 316         /* assert RST */
 317         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
 318
 319         /* The min. reset hold time is 25us, so 40us should be enough */
 320         udelay( 50 );
 321
 322         /* reset RST and interrupt */
 323         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
 324         NCR5380_read( RESET_PARITY_INTERRUPT_REG );
 325
 326         for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
 327                 barrier();
 328
 329         /* switch on SCSI IRQ again */
 330 //              sun3_enable_irq( IRQ_SUN3_SCSI );
 331
 332         printk( " done\n" );
 333 }
 334 #endif
 335
 336 static const char * sun3scsi_info (struct Scsi_Host *spnt) {
 337     return "";
 338 }
 339
 340 // safe bits for the CSR
 341 #define CSR_GOOD 0x060f
 342
 343 static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
 344 {
 345         unsigned short csr = dregs->csr;
 346         int handled = 0;
 347
 348         dregs->csr &= ~CSR_DMA_ENABLE;
 349
 350
 351 #ifdef SUN3_SCSI_DEBUG
 352         printk("scsi_intr csr %x\n", csr);
 353 #endif
 354
 355         if(csr & ~CSR_GOOD) {
 356                 if(csr & CSR_DMA_BUSERR) {
 357                         printk("scsi%d: bus error in dma\n", default_instance->host_no);
 358 #ifdef SUN3_SCSI_DEBUG
 359                         printk("scsi: residual %x count %x addr %p dmaaddr %x\n",
 360                                dregs->fifo_count,
 361                                dregs->dma_count_lo | (dregs->dma_count_hi << 16),
 362                                sun3_dma_orig_addr,
 363                                dregs->dma_addr_lo | (dregs->dma_addr_hi << 16));
 364 #endif
 365                 }
 366
 367                 if(csr & CSR_DMA_CONFLICT) {
 368                         printk("scsi%d: dma conflict\n", default_instance->host_no);
 369                 }
 370                 handled = 1;
 371         }
 372
 373         if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
 374                 NCR5380_intr(irq, dummy);
 375                 handled = 1;
 376         }
 377
 378         return IRQ_RETVAL(handled);
 379 }
 380
 381 /*
 382  * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
 383  * reentering NCR5380_print_status seems to have ugly side effects
 384  */
 385
 386 /* this doesn't seem to get used at all -- sam */
 387 #if 0
 388 void sun3_sun3_debug (void)
 389 {
 390         unsigned long flags;
 391         NCR5380_local_declare();
 392
 393         if (default_instance) {
 394                         local_irq_save(flags);
 395                         NCR5380_print_status(default_instance);
 396                         local_irq_restore(flags);
 397         }
 398 }
 399 #endif
 400
 401
 402 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
 403 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
 404 {
 405         void *addr;
 406
 407         if(sun3_dma_orig_addr != NULL)
 408                 dvma_unmap(sun3_dma_orig_addr);
 409
 410 //      addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
 411         addr = (void *)dvma_map_vme((unsigned long) data, count);
 412
 413         sun3_dma_orig_addr = addr;
 414         sun3_dma_orig_count = count;
 415
 416 #ifdef SUN3_SCSI_DEBUG
 417         printk("scsi: dma_setup addr %p count %x\n", addr, count);
 418 #endif
 419
 420 //      dregs->fifo_count = 0;
 421 #if 0
 422         /* reset fifo */
 423         dregs->csr &= ~CSR_FIFO;
 424         dregs->csr |= CSR_FIFO;
 425 #endif
 426         /* set direction */
 427         if(write_flag)
 428                 dregs->csr |= CSR_SEND;
 429         else
 430                 dregs->csr &= ~CSR_SEND;
 431
 432         /* reset fifo */
 433 //      dregs->csr &= ~CSR_FIFO;
 434 //      dregs->csr |= CSR_FIFO;
 435
 436         dregs->csr |= CSR_PACK_ENABLE;
 437
 438         dregs->dma_addr_hi = ((unsigned long)addr >> 16);
 439         dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
 440
 441         dregs->dma_count_hi = 0;
 442         dregs->dma_count_lo = 0;
 443         dregs->fifo_count_hi = 0;
 444         dregs->fifo_count = 0;
 445
 446 #ifdef SUN3_SCSI_DEBUG
 447         printk("scsi: dma_setup done csr %x\n", dregs->csr);
 448 #endif
 449         return count;
 450
 451 }
 452
 453 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
 454 {
 455         return last_residual;
 456 }
 457
 458 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
 459                                                   struct scsi_cmnd *cmd,
 460                                                   int write_flag)
 461 {
 462         if(blk_fs_request(cmd->request))
 463                 return wanted;
 464         else
 465                 return 0;
 466 }
 467
 468 static int sun3scsi_dma_start(unsigned long count, char *data)
 469 {
 470
 471         unsigned short csr;
 472
 473         csr = dregs->csr;
 474 #ifdef SUN3_SCSI_DEBUG
 475         printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count);
 476 #endif
 477
 478         dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
 479         dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
 480
 481         dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
 482         dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
 483
 484 //      if(!(csr & CSR_DMA_ENABLE))
 485 //              dregs->csr |= CSR_DMA_ENABLE;
 486
 487         return 0;
 488 }
 489
 490 /* clean up after our dma is done */
 491 static int sun3scsi_dma_finish(int write_flag)
 492 {
 493         unsigned short fifo;
 494         int ret = 0;
 495
 496         sun3_dma_active = 0;
 497
 498         dregs->csr &= ~CSR_DMA_ENABLE;
 499
 500         fifo = dregs->fifo_count;
 501         if(write_flag) {
 502                 if((fifo > 0) && (fifo < sun3_dma_orig_count))
 503                         fifo++;
 504         }
 505
 506         last_residual = fifo;
 507 #ifdef SUN3_SCSI_DEBUG
 508         printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count);
 509 #endif
 510         /* empty bytes from the fifo which didn't make it */
 511         if((!write_flag) && (dregs->csr & CSR_LEFT)) {
 512                 unsigned char *vaddr;
 513
 514 #ifdef SUN3_SCSI_DEBUG
 515                 printk("scsi: got left over bytes\n");
 516 #endif
 517
 518                 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
 519
 520                 vaddr += (sun3_dma_orig_count - fifo);
 521                 vaddr--;
 522
 523                 switch(dregs->csr & CSR_LEFT) {
 524                 case CSR_LEFT_3:
 525                         *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
 526                         vaddr--;
 527
 528                 case CSR_LEFT_2:
 529                         *vaddr = (dregs->bpack_hi & 0x00ff);
 530                         vaddr--;
 531
 532                 case CSR_LEFT_1:
 533                         *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
 534                         break;
 535                 }
 536
 537
 538         }
 539
 540         dvma_unmap(sun3_dma_orig_addr);
 541         sun3_dma_orig_addr = NULL;
 542
 543         dregs->dma_addr_hi = 0;
 544         dregs->dma_addr_lo = 0;
 545         dregs->dma_count_hi = 0;
 546         dregs->dma_count_lo = 0;
 547
 548         dregs->fifo_count = 0;
 549         dregs->fifo_count_hi = 0;
 550
 551         dregs->csr &= ~CSR_SEND;
 552
 553 //      dregs->csr |= CSR_DMA_ENABLE;
 554
 555 #if 0
 556         /* reset fifo */
 557         dregs->csr &= ~CSR_FIFO;
 558         dregs->csr |= CSR_FIFO;
 559 #endif
 560         sun3_dma_setup_done = NULL;
 561
 562         return ret;
 563
 564 }
 565
 566 #include "sun3_NCR5380.c"
 567
 568 static struct scsi_host_template driver_template = {
 569         .name                   = SUN3_SCSI_NAME,
 570         .detect                 = sun3scsi_detect,
 571         .release                = sun3scsi_release,
 572         .info                   = sun3scsi_info,
 573         .queuecommand           = sun3scsi_queue_command,
 574         .eh_abort_handler       = sun3scsi_abort,
 575         .eh_bus_reset_handler   = sun3scsi_bus_reset,
 576         .can_queue              = CAN_QUEUE,
 577         .this_id                = 7,
 578         .sg_tablesize           = SG_TABLESIZE,
 579         .cmd_per_lun            = CMD_PER_LUN,
 580         .use_clustering         = DISABLE_CLUSTERING
 581 };
 582
 583
 584 #include "scsi_module.c"
 585