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