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/ioport.h>
  24 #include <linux/init.h>
  25 #include <linux/blkdev.h>
  26
  27 #include <asm/io.h>
  28
  29 #include <asm/sun3ints.h>
  30 #include <asm/dvma.h>
  31 #include <asm/idprom.h>
  32 #include <asm/machines.h>
  33
  34 #define SUN3_SCSI_VME
  35
  36 #undef SUN3_SCSI_DEBUG
  37
  38 /* dma on! */
  39 #define REAL_DMA
  40
  41 #include "scsi.h"
  42 #include "initio.h"
  43 #include <scsi/scsi_host.h>
  44 #include "sun3_scsi.h"
  45
  46 extern int sun3_map_test(unsigned long, char *);
  47
  48 #define USE_WRAPPER
  49 /*#define RESET_BOOT */
  50 #define DRIVER_SETUP
  51
  52 /*
  53  * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
  54  */
  55 #ifdef BUG
  56 #undef RESET_BOOT
  57 #undef DRIVER_SETUP
  58 #endif
  59
  60 /* #define SUPPORT_TAGS */
  61
  62 //#define       ENABLE_IRQ()    enable_irq( SUN3_VEC_VMESCSI0 );
  63 #define ENABLE_IRQ()
  64
  65
  66 static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
  67 static inline unsigned char sun3scsi_read(int reg);
  68 static inline void sun3scsi_write(int reg, int value);
  69
  70 static int setup_can_queue = -1;
  71 module_param(setup_can_queue, int, 0);
  72 static int setup_cmd_per_lun = -1;
  73 module_param(setup_cmd_per_lun, int, 0);
  74 static int setup_sg_tablesize = -1;
  75 module_param(setup_sg_tablesize, int, 0);
  76 #ifdef SUPPORT_TAGS
  77 static int setup_use_tagged_queuing = -1;
  78 module_param(setup_use_tagged_queuing, int, 0);
  79 #endif
  80 static int setup_hostid = -1;
  81 module_param(setup_hostid, int, 0);
  82
  83 static struct scsi_cmnd *sun3_dma_setup_done = NULL;
  84
  85 #define AFTER_RESET_DELAY       (HZ/2)
  86
  87 /* ms to wait after hitting dma regs */
  88 #define SUN3_DMA_DELAY 10
  89
  90 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
  91 #define SUN3_DVMA_BUFSIZE 0xe000
  92
  93 /* minimum number of bytes to do dma on */
  94 #define SUN3_DMA_MINSIZE 128
  95
  96 static volatile unsigned char *sun3_scsi_regp;
  97 static volatile struct sun3_dma_regs *dregs;
  98 #ifdef OLDDMA
  99 static unsigned char *dmabuf = NULL; /* dma memory buffer */
 100 #endif
 101 static unsigned char *sun3_dma_orig_addr = NULL;
 102 static unsigned long sun3_dma_orig_count = 0;
 103 static int sun3_dma_active = 0;
 104 static unsigned long last_residual = 0;
 105
 106 /*
 107  * NCR 5380 register access functions
 108  */
 109
 110 static inline unsigned char sun3scsi_read(int reg)
 111 {
 112         return( sun3_scsi_regp[reg] );
 113 }
 114
 115 static inline void sun3scsi_write(int reg, int value)
 116 {
 117         sun3_scsi_regp[reg] = value;
 118 }
 119
 120 /*
 121  * XXX: status debug
 122  */
 123 static struct Scsi_Host *default_instance;
 124
 125 /*
 126  * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
 127  *
 128  * Purpose : initializes mac NCR5380 driver based on the
 129  *      command line / compile time port and irq definitions.
 130  *
 131  * Inputs : tpnt - template for this SCSI adapter.
 132  *
 133  * Returns : 1 if a host adapter was found, 0 if not.
 134  *
 135  */
 136
 137 static int __init sun3scsi_detect(struct scsi_host_template * tpnt)
 138 {
 139         unsigned long ioaddr, irq = 0;
 140         static int called = 0;
 141         struct Scsi_Host *instance;
 142         int i;
 143         unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI,
 144                                    IOBASE_SUN3_VMESCSI + 0x4000,
 145                                    0 };
 146         unsigned long vecs[3] = { SUN3_VEC_VMESCSI0,
 147                                   SUN3_VEC_VMESCSI1,
 148                                   0 };
 149         /* check that this machine has an onboard 5380 */
 150         switch(idprom->id_machtype) {
 151         case SM_SUN3|SM_3_160:
 152         case SM_SUN3|SM_3_260:
 153                 break;
 154
 155         default:
 156                 return 0;
 157         }
 158
 159         if(called)
 160                 return 0;
 161
 162         tpnt->proc_name = "Sun3 5380 VME SCSI";
 163
 164         /* setup variables */
 165         tpnt->can_queue =
 166                 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
 167         tpnt->cmd_per_lun =
 168                 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
 169         tpnt->sg_tablesize =
 170                 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
 171
 172         if (setup_hostid >= 0)
 173                 tpnt->this_id = setup_hostid;
 174         else {
 175                 /* use 7 as default */
 176                 tpnt->this_id = 7;
 177         }
 178
 179         ioaddr = 0;
 180         for(i = 0; addrs[i] != 0; i++) {
 181                 unsigned char x;
 182
 183                 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE,
 184                                                      SUN3_PAGE_TYPE_VME16);
 185                 irq = vecs[i];
 186                 sun3_scsi_regp = (unsigned char *)ioaddr;
 187
 188                 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
 189
 190                 if(sun3_map_test((unsigned long)dregs, &x)) {
 191                         unsigned short oldcsr;
 192
 193                         oldcsr = dregs->csr;
 194                         dregs->csr = 0;
 195                         udelay(SUN3_DMA_DELAY);
 196                         if(dregs->csr == 0x1400)
 197                                 break;
 198
 199                         dregs->csr = oldcsr;
 200                 }
 201
 202                 iounmap((void *)ioaddr);
 203                 ioaddr = 0;
 204         }
 205
 206         if(!ioaddr)
 207                 return 0;
 208
 209 #ifdef SUPPORT_TAGS
 210         if (setup_use_tagged_queuing < 0)
 211                 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
 212 #endif
 213
 214         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 215         if(instance == NULL)
 216                 return 0;
 217
 218         default_instance = instance;
 219
 220         instance->io_port = (unsigned long) ioaddr;
 221         instance->irq = irq;
 222
 223         NCR5380_init(instance, 0);
 224
 225         instance->n_io_port = 32;
 226
 227         ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
 228
 229         if (request_irq(instance->irq, scsi_sun3_intr,
 230                         0, "Sun3SCSI-5380VME", instance)) {
 231 #ifndef REAL_DMA
 232                 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
 233                        instance->host_no, instance->irq);
 234                 instance->irq = SCSI_IRQ_NONE;
 235 #else
 236                 printk("scsi%d: IRQ%d not free, bailing out\n",
 237                        instance->host_no, instance->irq);
 238                 return 0;
 239 #endif
 240         }
 241
 242         printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port);
 243         if (instance->irq == SCSI_IRQ_NONE)
 244                 printk ("s disabled");
 245         else
 246                 printk (" %d", instance->irq);
 247         printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 248                instance->can_queue, instance->cmd_per_lun,
 249                SUN3SCSI_PUBLIC_RELEASE);
 250         printk("\nscsi%d:", instance->host_no);
 251         NCR5380_print_options(instance);
 252         printk("\n");
 253
 254         dregs->csr = 0;
 255         udelay(SUN3_DMA_DELAY);
 256         dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
 257         udelay(SUN3_DMA_DELAY);
 258         dregs->fifo_count = 0;
 259         dregs->fifo_count_hi = 0;
 260         dregs->dma_addr_hi = 0;
 261         dregs->dma_addr_lo = 0;
 262         dregs->dma_count_hi = 0;
 263         dregs->dma_count_lo = 0;
 264
 265         dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
 266
 267         called = 1;
 268
 269 #ifdef RESET_BOOT
 270         sun3_scsi_reset_boot(instance);
 271 #endif
 272
 273         return 1;
 274 }
 275
 276 int sun3scsi_release (struct Scsi_Host *shpnt)
 277 {
 278         if (shpnt->irq != SCSI_IRQ_NONE)
 279                 free_irq(shpnt->irq, shpnt);
 280
 281         iounmap((void *)sun3_scsi_regp);
 282
 283         NCR5380_exit(shpnt);
 284         return 0;
 285 }
 286
 287 #ifdef RESET_BOOT
 288 /*
 289  * Our 'bus reset on boot' function
 290  */
 291
 292 static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
 293 {
 294         unsigned long end;
 295
 296         NCR5380_local_declare();
 297         NCR5380_setup(instance);
 298
 299         /*
 300          * Do a SCSI reset to clean up the bus during initialization. No
 301          * messing with the queues, interrupts, or locks necessary here.
 302          */
 303
 304         printk( "Sun3 SCSI: resetting the SCSI bus..." );
 305
 306         /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
 307 //              sun3_disable_irq( IRQ_SUN3_SCSI );
 308
 309         /* get in phase */
 310         NCR5380_write( TARGET_COMMAND_REG,
 311                       PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
 312
 313         /* assert RST */
 314         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
 315
 316         /* The min. reset hold time is 25us, so 40us should be enough */
 317         udelay( 50 );
 318
 319         /* reset RST and interrupt */
 320         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
 321         NCR5380_read( RESET_PARITY_INTERRUPT_REG );
 322
 323         for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
 324                 barrier();
 325
 326         /* switch on SCSI IRQ again */
 327 //              sun3_enable_irq( IRQ_SUN3_SCSI );
 328
 329         printk( " done\n" );
 330 }
 331 #endif
 332
 333 static const char * sun3scsi_info (struct Scsi_Host *spnt) {
 334     return "";
 335 }
 336
 337 // safe bits for the CSR
 338 #define CSR_GOOD 0x060f
 339
 340 static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
 341 {
 342         unsigned short csr = dregs->csr;
 343         int handled = 0;
 344
 345         dregs->csr &= ~CSR_DMA_ENABLE;
 346
 347
 348 #ifdef SUN3_SCSI_DEBUG
 349         printk("scsi_intr csr %x\n", csr);
 350 #endif
 351
 352         if(csr & ~CSR_GOOD) {
 353                 if(csr & CSR_DMA_BUSERR) {
 354                         printk("scsi%d: bus error in dma\n", default_instance->host_no);
 355 #ifdef SUN3_SCSI_DEBUG
 356                         printk("scsi: residual %x count %x addr %p dmaaddr %x\n",
 357                                dregs->fifo_count,
 358                                dregs->dma_count_lo | (dregs->dma_count_hi << 16),
 359                                sun3_dma_orig_addr,
 360                                dregs->dma_addr_lo | (dregs->dma_addr_hi << 16));
 361 #endif
 362                 }
 363
 364                 if(csr & CSR_DMA_CONFLICT) {
 365                         printk("scsi%d: dma conflict\n", default_instance->host_no);
 366                 }
 367                 handled = 1;
 368         }
 369
 370         if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
 371                 NCR5380_intr(irq, dummy);
 372                 handled = 1;
 373         }
 374
 375         return IRQ_RETVAL(handled);
 376 }
 377
 378 /*
 379  * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
 380  * reentering NCR5380_print_status seems to have ugly side effects
 381  */
 382
 383 /* this doesn't seem to get used at all -- sam */
 384 #if 0
 385 void sun3_sun3_debug (void)
 386 {
 387         unsigned long flags;
 388         NCR5380_local_declare();
 389
 390         if (default_instance) {
 391                         local_irq_save(flags);
 392                         NCR5380_print_status(default_instance);
 393                         local_irq_restore(flags);
 394         }
 395 }
 396 #endif
 397
 398
 399 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
 400 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
 401 {
 402         void *addr;
 403
 404         if(sun3_dma_orig_addr != NULL)
 405                 dvma_unmap(sun3_dma_orig_addr);
 406
 407 //      addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
 408         addr = (void *)dvma_map_vme((unsigned long) data, count);
 409
 410         sun3_dma_orig_addr = addr;
 411         sun3_dma_orig_count = count;
 412
 413 #ifdef SUN3_SCSI_DEBUG
 414         printk("scsi: dma_setup addr %p count %x\n", addr, count);
 415 #endif
 416
 417 //      dregs->fifo_count = 0;
 418 #if 0
 419         /* reset fifo */
 420         dregs->csr &= ~CSR_FIFO;
 421         dregs->csr |= CSR_FIFO;
 422 #endif
 423         /* set direction */
 424         if(write_flag)
 425                 dregs->csr |= CSR_SEND;
 426         else
 427                 dregs->csr &= ~CSR_SEND;
 428
 429         /* reset fifo */
 430 //      dregs->csr &= ~CSR_FIFO;
 431 //      dregs->csr |= CSR_FIFO;
 432
 433         dregs->csr |= CSR_PACK_ENABLE;
 434
 435         dregs->dma_addr_hi = ((unsigned long)addr >> 16);
 436         dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
 437
 438         dregs->dma_count_hi = 0;
 439         dregs->dma_count_lo = 0;
 440         dregs->fifo_count_hi = 0;
 441         dregs->fifo_count = 0;
 442
 443 #ifdef SUN3_SCSI_DEBUG
 444         printk("scsi: dma_setup done csr %x\n", dregs->csr);
 445 #endif
 446         return count;
 447
 448 }
 449
 450 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
 451 {
 452         return last_residual;
 453 }
 454
 455 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
 456                                                   struct scsi_cmnd *cmd,
 457                                                   int write_flag)
 458 {
 459         if (cmd->request->cmd_type == REQ_TYPE_FS)
 460                 return wanted;
 461         else
 462                 return 0;
 463 }
 464
 465 static int sun3scsi_dma_start(unsigned long count, char *data)
 466 {
 467
 468         unsigned short csr;
 469
 470         csr = dregs->csr;
 471 #ifdef SUN3_SCSI_DEBUG
 472         printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count);
 473 #endif
 474
 475         dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
 476         dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
 477
 478         dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
 479         dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
 480
 481 //      if(!(csr & CSR_DMA_ENABLE))
 482 //              dregs->csr |= CSR_DMA_ENABLE;
 483
 484         return 0;
 485 }
 486
 487 /* clean up after our dma is done */
 488 static int sun3scsi_dma_finish(int write_flag)
 489 {
 490         unsigned short fifo;
 491         int ret = 0;
 492
 493         sun3_dma_active = 0;
 494
 495         dregs->csr &= ~CSR_DMA_ENABLE;
 496
 497         fifo = dregs->fifo_count;
 498         if(write_flag) {
 499                 if((fifo > 0) && (fifo < sun3_dma_orig_count))
 500                         fifo++;
 501         }
 502
 503         last_residual = fifo;
 504 #ifdef SUN3_SCSI_DEBUG
 505         printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count);
 506 #endif
 507         /* empty bytes from the fifo which didn't make it */
 508         if((!write_flag) && (dregs->csr & CSR_LEFT)) {
 509                 unsigned char *vaddr;
 510
 511 #ifdef SUN3_SCSI_DEBUG
 512                 printk("scsi: got left over bytes\n");
 513 #endif
 514
 515                 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
 516
 517                 vaddr += (sun3_dma_orig_count - fifo);
 518                 vaddr--;
 519
 520                 switch(dregs->csr & CSR_LEFT) {
 521                 case CSR_LEFT_3:
 522                         *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
 523                         vaddr--;
 524
 525                 case CSR_LEFT_2:
 526                         *vaddr = (dregs->bpack_hi & 0x00ff);
 527                         vaddr--;
 528
 529                 case CSR_LEFT_1:
 530                         *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
 531                         break;
 532                 }
 533
 534
 535         }
 536
 537         dvma_unmap(sun3_dma_orig_addr);
 538         sun3_dma_orig_addr = NULL;
 539
 540         dregs->dma_addr_hi = 0;
 541         dregs->dma_addr_lo = 0;
 542         dregs->dma_count_hi = 0;
 543         dregs->dma_count_lo = 0;
 544
 545         dregs->fifo_count = 0;
 546         dregs->fifo_count_hi = 0;
 547
 548         dregs->csr &= ~CSR_SEND;
 549
 550 //      dregs->csr |= CSR_DMA_ENABLE;
 551
 552 #if 0
 553         /* reset fifo */
 554         dregs->csr &= ~CSR_FIFO;
 555         dregs->csr |= CSR_FIFO;
 556 #endif
 557         sun3_dma_setup_done = NULL;
 558
 559         return ret;
 560
 561 }
 562
 563 #include "sun3_NCR5380.c"
 564
 565 static struct scsi_host_template driver_template = {
 566         .name                   = SUN3_SCSI_NAME,
 567         .detect                 = sun3scsi_detect,
 568         .release                = sun3scsi_release,
 569         .info                   = sun3scsi_info,
 570         .queuecommand           = sun3scsi_queue_command,
 571         .eh_abort_handler       = sun3scsi_abort,
 572         .eh_bus_reset_handler   = sun3scsi_bus_reset,
 573         .can_queue              = CAN_QUEUE,
 574         .this_id                = 7,
 575         .sg_tablesize           = SG_TABLESIZE,
 576         .cmd_per_lun            = CMD_PER_LUN,
 577         .use_clustering         = DISABLE_CLUSTERING
 578 };
 579
 580
 581 #include "scsi_module.c"
 582
 583 MODULE_LICENSE("GPL");