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