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 #define NDEBUG 0
  42
  43 #define NDEBUG_ABORT            0x00100000
  44 #define NDEBUG_TAGS             0x00200000
  45 #define NDEBUG_MERGING          0x00400000
  46
  47 #include "scsi.h"
  48 #include "initio.h"
  49 #include <scsi/scsi_host.h>
  50 #include "sun3_scsi.h"
  51
  52 extern int sun3_map_test(unsigned long, char *);
  53
  54 #define USE_WRAPPER
  55 /*#define RESET_BOOT */
  56 #define DRIVER_SETUP
  57
  58 /*
  59  * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
  60  */
  61 #ifdef BUG
  62 #undef RESET_BOOT
  63 #undef DRIVER_SETUP
  64 #endif
  65
  66 /* #define SUPPORT_TAGS */
  67
  68 //#define       ENABLE_IRQ()    enable_irq( SUN3_VEC_VMESCSI0 );
  69 #define ENABLE_IRQ()
  70
  71
  72 static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
  73 static inline unsigned char sun3scsi_read(int reg);
  74 static inline void sun3scsi_write(int reg, int value);
  75
  76 static int setup_can_queue = -1;
  77 module_param(setup_can_queue, int, 0);
  78 static int setup_cmd_per_lun = -1;
  79 module_param(setup_cmd_per_lun, int, 0);
  80 static int setup_sg_tablesize = -1;
  81 module_param(setup_sg_tablesize, int, 0);
  82 #ifdef SUPPORT_TAGS
  83 static int setup_use_tagged_queuing = -1;
  84 module_param(setup_use_tagged_queuing, int, 0);
  85 #endif
  86 static int setup_hostid = -1;
  87 module_param(setup_hostid, int, 0);
  88
  89 static struct scsi_cmnd *sun3_dma_setup_done = NULL;
  90
  91 #define AFTER_RESET_DELAY       (HZ/2)
  92
  93 /* ms to wait after hitting dma regs */
  94 #define SUN3_DMA_DELAY 10
  95
  96 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
  97 #define SUN3_DVMA_BUFSIZE 0xe000
  98
  99 /* minimum number of bytes to do dma on */
 100 #define SUN3_DMA_MINSIZE 128
 101
 102 static volatile unsigned char *sun3_scsi_regp;
 103 static volatile struct sun3_dma_regs *dregs;
 104 #ifdef OLDDMA
 105 static unsigned char *dmabuf = NULL; /* dma memory buffer */
 106 #endif
 107 static unsigned char *sun3_dma_orig_addr = NULL;
 108 static unsigned long sun3_dma_orig_count = 0;
 109 static int sun3_dma_active = 0;
 110 static unsigned long last_residual = 0;
 111
 112 /*
 113  * NCR 5380 register access functions
 114  */
 115
 116 static inline unsigned char sun3scsi_read(int reg)
 117 {
 118         return( sun3_scsi_regp[reg] );
 119 }
 120
 121 static inline void sun3scsi_write(int reg, int value)
 122 {
 123         sun3_scsi_regp[reg] = value;
 124 }
 125
 126 /*
 127  * XXX: status debug
 128  */
 129 static struct Scsi_Host *default_instance;
 130
 131 /*
 132  * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
 133  *
 134  * Purpose : initializes mac NCR5380 driver based on the
 135  *      command line / compile time port and irq definitions.
 136  *
 137  * Inputs : tpnt - template for this SCSI adapter.
 138  *
 139  * Returns : 1 if a host adapter was found, 0 if not.
 140  *
 141  */
 142
 143 static int __init sun3scsi_detect(struct scsi_host_template * tpnt)
 144 {
 145         unsigned long ioaddr, irq = 0;
 146         static int called = 0;
 147         struct Scsi_Host *instance;
 148         int i;
 149         unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI,
 150                                    IOBASE_SUN3_VMESCSI + 0x4000,
 151                                    0 };
 152         unsigned long vecs[3] = { SUN3_VEC_VMESCSI0,
 153                                   SUN3_VEC_VMESCSI1,
 154                                   0 };
 155         /* check that this machine has an onboard 5380 */
 156         switch(idprom->id_machtype) {
 157         case SM_SUN3|SM_3_160:
 158         case SM_SUN3|SM_3_260:
 159                 break;
 160
 161         default:
 162                 return 0;
 163         }
 164
 165         if(called)
 166                 return 0;
 167
 168         tpnt->proc_name = "Sun3 5380 VME SCSI";
 169
 170         /* setup variables */
 171         tpnt->can_queue =
 172                 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
 173         tpnt->cmd_per_lun =
 174                 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
 175         tpnt->sg_tablesize =
 176                 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
 177
 178         if (setup_hostid >= 0)
 179                 tpnt->this_id = setup_hostid;
 180         else {
 181                 /* use 7 as default */
 182                 tpnt->this_id = 7;
 183         }
 184
 185         ioaddr = 0;
 186         for(i = 0; addrs[i] != 0; i++) {
 187                 unsigned char x;
 188
 189                 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE,
 190                                                      SUN3_PAGE_TYPE_VME16);
 191                 irq = vecs[i];
 192                 sun3_scsi_regp = (unsigned char *)ioaddr;
 193
 194                 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
 195
 196                 if(sun3_map_test((unsigned long)dregs, &x)) {
 197                         unsigned short oldcsr;
 198
 199                         oldcsr = dregs->csr;
 200                         dregs->csr = 0;
 201                         udelay(SUN3_DMA_DELAY);
 202                         if(dregs->csr == 0x1400)
 203                                 break;
 204
 205                         dregs->csr = oldcsr;
 206                 }
 207
 208                 iounmap((void *)ioaddr);
 209                 ioaddr = 0;
 210         }
 211
 212         if(!ioaddr)
 213                 return 0;
 214
 215 #ifdef SUPPORT_TAGS
 216         if (setup_use_tagged_queuing < 0)
 217                 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
 218 #endif
 219
 220         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 221         if(instance == NULL)
 222                 return 0;
 223
 224         default_instance = instance;
 225
 226         instance->io_port = (unsigned long) ioaddr;
 227         instance->irq = irq;
 228
 229         NCR5380_init(instance, 0);
 230
 231         instance->n_io_port = 32;
 232
 233         ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
 234
 235         if (request_irq(instance->irq, scsi_sun3_intr,
 236                         0, "Sun3SCSI-5380VME", instance)) {
 237 #ifndef REAL_DMA
 238                 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
 239                        instance->host_no, instance->irq);
 240                 instance->irq = SCSI_IRQ_NONE;
 241 #else
 242                 printk("scsi%d: IRQ%d not free, bailing out\n",
 243                        instance->host_no, instance->irq);
 244                 return 0;
 245 #endif
 246         }
 247
 248         printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port);
 249         if (instance->irq == SCSI_IRQ_NONE)
 250                 printk ("s disabled");
 251         else
 252                 printk (" %d", instance->irq);
 253         printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 254                instance->can_queue, instance->cmd_per_lun,
 255                SUN3SCSI_PUBLIC_RELEASE);
 256         printk("\nscsi%d:", instance->host_no);
 257         NCR5380_print_options(instance);
 258         printk("\n");
 259
 260         dregs->csr = 0;
 261         udelay(SUN3_DMA_DELAY);
 262         dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
 263         udelay(SUN3_DMA_DELAY);
 264         dregs->fifo_count = 0;
 265         dregs->fifo_count_hi = 0;
 266         dregs->dma_addr_hi = 0;
 267         dregs->dma_addr_lo = 0;
 268         dregs->dma_count_hi = 0;
 269         dregs->dma_count_lo = 0;
 270
 271         dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
 272
 273         called = 1;
 274
 275 #ifdef RESET_BOOT
 276         sun3_scsi_reset_boot(instance);
 277 #endif
 278
 279         return 1;
 280 }
 281
 282 int sun3scsi_release (struct Scsi_Host *shpnt)
 283 {
 284         if (shpnt->irq != SCSI_IRQ_NONE)
 285                 free_irq(shpnt->irq, shpnt);
 286
 287         iounmap((void *)sun3_scsi_regp);
 288
 289         NCR5380_exit(shpnt);
 290         return 0;
 291 }
 292
 293 #ifdef RESET_BOOT
 294 /*
 295  * Our 'bus reset on boot' function
 296  */
 297
 298 static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
 299 {
 300         unsigned long end;
 301
 302         NCR5380_local_declare();
 303         NCR5380_setup(instance);
 304
 305         /*
 306          * Do a SCSI reset to clean up the bus during initialization. No
 307          * messing with the queues, interrupts, or locks necessary here.
 308          */
 309
 310         printk( "Sun3 SCSI: resetting the SCSI bus..." );
 311
 312         /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
 313 //              sun3_disable_irq( IRQ_SUN3_SCSI );
 314
 315         /* get in phase */
 316         NCR5380_write( TARGET_COMMAND_REG,
 317                       PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
 318
 319         /* assert RST */
 320         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
 321
 322         /* The min. reset hold time is 25us, so 40us should be enough */
 323         udelay( 50 );
 324
 325         /* reset RST and interrupt */
 326         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
 327         NCR5380_read( RESET_PARITY_INTERRUPT_REG );
 328
 329         for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
 330                 barrier();
 331
 332         /* switch on SCSI IRQ again */
 333 //              sun3_enable_irq( IRQ_SUN3_SCSI );
 334
 335         printk( " done\n" );
 336 }
 337 #endif
 338
 339 static const char * sun3scsi_info (struct Scsi_Host *spnt) {
 340     return "";
 341 }
 342
 343 // safe bits for the CSR
 344 #define CSR_GOOD 0x060f
 345
 346 static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
 347 {
 348         unsigned short csr = dregs->csr;
 349         int handled = 0;
 350
 351         dregs->csr &= ~CSR_DMA_ENABLE;
 352
 353
 354 #ifdef SUN3_SCSI_DEBUG
 355         printk("scsi_intr csr %x\n", csr);
 356 #endif
 357
 358         if(csr & ~CSR_GOOD) {
 359                 if(csr & CSR_DMA_BUSERR) {
 360                         printk("scsi%d: bus error in dma\n", default_instance->host_no);
 361 #ifdef SUN3_SCSI_DEBUG
 362                         printk("scsi: residual %x count %x addr %p dmaaddr %x\n",
 363                                dregs->fifo_count,
 364                                dregs->dma_count_lo | (dregs->dma_count_hi << 16),
 365                                sun3_dma_orig_addr,
 366                                dregs->dma_addr_lo | (dregs->dma_addr_hi << 16));
 367 #endif
 368                 }
 369
 370                 if(csr & CSR_DMA_CONFLICT) {
 371                         printk("scsi%d: dma conflict\n", default_instance->host_no);
 372                 }
 373                 handled = 1;
 374         }
 375
 376         if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
 377                 NCR5380_intr(irq, dummy);
 378                 handled = 1;
 379         }
 380
 381         return IRQ_RETVAL(handled);
 382 }
 383
 384 /*
 385  * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
 386  * reentering NCR5380_print_status seems to have ugly side effects
 387  */
 388
 389 /* this doesn't seem to get used at all -- sam */
 390 #if 0
 391 void sun3_sun3_debug (void)
 392 {
 393         unsigned long flags;
 394         NCR5380_local_declare();
 395
 396         if (default_instance) {
 397                         local_irq_save(flags);
 398                         NCR5380_print_status(default_instance);
 399                         local_irq_restore(flags);
 400         }
 401 }
 402 #endif
 403
 404
 405 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
 406 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
 407 {
 408         void *addr;
 409
 410         if(sun3_dma_orig_addr != NULL)
 411                 dvma_unmap(sun3_dma_orig_addr);
 412
 413 //      addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
 414         addr = (void *)dvma_map_vme((unsigned long) data, count);
 415
 416         sun3_dma_orig_addr = addr;
 417         sun3_dma_orig_count = count;
 418
 419 #ifdef SUN3_SCSI_DEBUG
 420         printk("scsi: dma_setup addr %p count %x\n", addr, count);
 421 #endif
 422
 423 //      dregs->fifo_count = 0;
 424 #if 0
 425         /* reset fifo */
 426         dregs->csr &= ~CSR_FIFO;
 427         dregs->csr |= CSR_FIFO;
 428 #endif
 429         /* set direction */
 430         if(write_flag)
 431                 dregs->csr |= CSR_SEND;
 432         else
 433                 dregs->csr &= ~CSR_SEND;
 434
 435         /* reset fifo */
 436 //      dregs->csr &= ~CSR_FIFO;
 437 //      dregs->csr |= CSR_FIFO;
 438
 439         dregs->csr |= CSR_PACK_ENABLE;
 440
 441         dregs->dma_addr_hi = ((unsigned long)addr >> 16);
 442         dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
 443
 444         dregs->dma_count_hi = 0;
 445         dregs->dma_count_lo = 0;
 446         dregs->fifo_count_hi = 0;
 447         dregs->fifo_count = 0;
 448
 449 #ifdef SUN3_SCSI_DEBUG
 450         printk("scsi: dma_setup done csr %x\n", dregs->csr);
 451 #endif
 452         return count;
 453
 454 }
 455
 456 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
 457 {
 458         return last_residual;
 459 }
 460
 461 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
 462                                                   struct scsi_cmnd *cmd,
 463                                                   int write_flag)
 464 {
 465         if (cmd->request->cmd_type == REQ_TYPE_FS)
 466                 return wanted;
 467         else
 468                 return 0;
 469 }
 470
 471 static int sun3scsi_dma_start(unsigned long count, char *data)
 472 {
 473
 474         unsigned short csr;
 475
 476         csr = dregs->csr;
 477 #ifdef SUN3_SCSI_DEBUG
 478         printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count);
 479 #endif
 480
 481         dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
 482         dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
 483
 484         dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
 485         dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
 486
 487 //      if(!(csr & CSR_DMA_ENABLE))
 488 //              dregs->csr |= CSR_DMA_ENABLE;
 489
 490         return 0;
 491 }
 492
 493 /* clean up after our dma is done */
 494 static int sun3scsi_dma_finish(int write_flag)
 495 {
 496         unsigned short fifo;
 497         int ret = 0;
 498
 499         sun3_dma_active = 0;
 500
 501         dregs->csr &= ~CSR_DMA_ENABLE;
 502
 503         fifo = dregs->fifo_count;
 504         if(write_flag) {
 505                 if((fifo > 0) && (fifo < sun3_dma_orig_count))
 506                         fifo++;
 507         }
 508
 509         last_residual = fifo;
 510 #ifdef SUN3_SCSI_DEBUG
 511         printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count);
 512 #endif
 513         /* empty bytes from the fifo which didn't make it */
 514         if((!write_flag) && (dregs->csr & CSR_LEFT)) {
 515                 unsigned char *vaddr;
 516
 517 #ifdef SUN3_SCSI_DEBUG
 518                 printk("scsi: got left over bytes\n");
 519 #endif
 520
 521                 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
 522
 523                 vaddr += (sun3_dma_orig_count - fifo);
 524                 vaddr--;
 525
 526                 switch(dregs->csr & CSR_LEFT) {
 527                 case CSR_LEFT_3:
 528                         *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
 529                         vaddr--;
 530
 531                 case CSR_LEFT_2:
 532                         *vaddr = (dregs->bpack_hi & 0x00ff);
 533                         vaddr--;
 534
 535                 case CSR_LEFT_1:
 536                         *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
 537                         break;
 538                 }
 539
 540
 541         }
 542
 543         dvma_unmap(sun3_dma_orig_addr);
 544         sun3_dma_orig_addr = NULL;
 545
 546         dregs->dma_addr_hi = 0;
 547         dregs->dma_addr_lo = 0;
 548         dregs->dma_count_hi = 0;
 549         dregs->dma_count_lo = 0;
 550
 551         dregs->fifo_count = 0;
 552         dregs->fifo_count_hi = 0;
 553
 554         dregs->csr &= ~CSR_SEND;
 555
 556 //      dregs->csr |= CSR_DMA_ENABLE;
 557
 558 #if 0
 559         /* reset fifo */
 560         dregs->csr &= ~CSR_FIFO;
 561         dregs->csr |= CSR_FIFO;
 562 #endif
 563         sun3_dma_setup_done = NULL;
 564
 565         return ret;
 566
 567 }
 568
 569 #include "sun3_NCR5380.c"
 570
 571 static struct scsi_host_template driver_template = {
 572         .name                   = SUN3_SCSI_NAME,
 573         .detect                 = sun3scsi_detect,
 574         .release                = sun3scsi_release,
 575         .info                   = sun3scsi_info,
 576         .queuecommand           = sun3scsi_queue_command,
 577         .eh_abort_handler       = sun3scsi_abort,
 578         .eh_bus_reset_handler   = sun3scsi_bus_reset,
 579         .can_queue              = CAN_QUEUE,
 580         .this_id                = 7,
 581         .sg_tablesize           = SG_TABLESIZE,
 582         .cmd_per_lun            = CMD_PER_LUN,
 583         .use_clustering         = DISABLE_CLUSTERING
 584 };
 585
 586
 587 #include "scsi_module.c"
 588
 589 MODULE_LICENSE("GPL");