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/blk.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 "hosts.h"
  45 #include "sun3_scsi.h"
  46 #include "NCR5380.h"
  47 #include "constants.h"
  48
  49 extern int sun3_map_test(unsigned long, char *);
  50
  51 #define USE_WRAPPER
  52 /*#define RESET_BOOT */
  53 #define DRIVER_SETUP
  54
  55 #define NDEBUG 0
  56
  57 /*
  58  * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
  59  */
  60 #ifdef BUG
  61 #undef RESET_BOOT
  62 #undef DRIVER_SETUP
  63 #endif
  64
  65 /* #define SUPPORT_TAGS */
  66
  67 //#define       ENABLE_IRQ()    enable_irq( SUN3_VEC_VMESCSI0 );
  68 #define ENABLE_IRQ()
  69
  70
  71 static void scsi_sun3_intr(int irq, void *dummy, struct pt_regs *fp);
  72 static inline unsigned char sun3scsi_read(int reg);
  73 static inline void sun3scsi_write(int reg, int value);
  74
  75 static int setup_can_queue = -1;
  76 MODULE_PARM(setup_can_queue, "i");
  77 static int setup_cmd_per_lun = -1;
  78 MODULE_PARM(setup_cmd_per_lun, "i");
  79 static int setup_sg_tablesize = -1;
  80 MODULE_PARM(setup_sg_tablesize, "i");
  81 #ifdef SUPPORT_TAGS
  82 static int setup_use_tagged_queuing = -1;
  83 MODULE_PARM(setup_use_tagged_queuing, "i");
  84 #endif
  85 static int setup_hostid = -1;
  86 MODULE_PARM(setup_hostid, "i");
  87
  88 static Scsi_Cmnd *sun3_dma_setup_done = NULL;
  89
  90 #define AFTER_RESET_DELAY       (HZ/2)
  91
  92 /* ms to wait after hitting dma regs */
  93 #define SUN3_DMA_DELAY 10
  94
  95 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
  96 #define SUN3_DVMA_BUFSIZE 0xe000
  97
  98 /* minimum number of bytes to do dma on */
  99 #define SUN3_DMA_MINSIZE 128
 100
 101 static volatile unsigned char *sun3_scsi_regp;
 102 static volatile struct sun3_dma_regs *dregs;
 103 #ifdef OLDDMA
 104 static unsigned char *dmabuf = NULL; /* dma memory buffer */
 105 #endif
 106 static unsigned char *sun3_dma_orig_addr = NULL;
 107 static unsigned long sun3_dma_orig_count = 0;
 108 static int sun3_dma_active = 0;
 109 static unsigned long last_residual = 0;
 110
 111 /*
 112  * NCR 5380 register access functions
 113  */
 114
 115 static inline unsigned char sun3scsi_read(int reg)
 116 {
 117         return( sun3_scsi_regp[reg] );
 118 }
 119
 120 static inline void sun3scsi_write(int reg, int value)
 121 {
 122         sun3_scsi_regp[reg] = value;
 123 }
 124
 125 /*
 126  * XXX: status debug
 127  */
 128 static struct Scsi_Host *default_instance;
 129
 130 /*
 131  * Function : int sun3scsi_detect(Scsi_Host_Template * tpnt)
 132  *
 133  * Purpose : initializes mac NCR5380 driver based on the
 134  *      command line / compile time port and irq definitions.
 135  *
 136  * Inputs : tpnt - template for this SCSI adapter.
 137  *
 138  * Returns : 1 if a host adapter was found, 0 if not.
 139  *
 140  */
 141
 142 static int sun3scsi_detect(Scsi_Host_Template * tpnt)
 143 {
 144         unsigned long ioaddr, irq;
 145         static int called = 0;
 146         struct Scsi_Host *instance;
 147         int i;
 148         unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI,
 149                                    IOBASE_SUN3_VMESCSI + 0x4000,
 150                                    0 };
 151         unsigned long vecs[3] = { SUN3_VEC_VMESCSI0,
 152                                   SUN3_VEC_VMESCSI1,
 153                                   0 };
 154         /* check that this machine has an onboard 5380 */
 155         switch(idprom->id_machtype) {
 156         case SM_SUN3|SM_3_160:
 157         case SM_SUN3|SM_3_260:
 158                 break;
 159
 160         default:
 161                 return 0;
 162         }
 163
 164         if(called)
 165                 return 0;
 166
 167         tpnt->proc_name = "Sun3 5380 VME SCSI";
 168
 169         /* setup variables */
 170         tpnt->can_queue =
 171                 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
 172         tpnt->cmd_per_lun =
 173                 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
 174         tpnt->sg_tablesize =
 175                 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
 176
 177         if (setup_hostid >= 0)
 178                 tpnt->this_id = setup_hostid;
 179         else {
 180                 /* use 7 as default */
 181                 tpnt->this_id = 7;
 182         }
 183
 184         ioaddr = 0;
 185         for(i = 0; addrs[i] != 0; i++) {
 186                 unsigned char x;
 187
 188                 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE,
 189                                                      SUN3_PAGE_TYPE_VME16);
 190                 irq = vecs[i];
 191                 sun3_scsi_regp = (unsigned char *)ioaddr;
 192
 193                 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
 194
 195                 if(sun3_map_test((unsigned long)dregs, &x)) {
 196                         unsigned short oldcsr;
 197
 198                         oldcsr = dregs->csr;
 199                         dregs->csr = 0;
 200                         udelay(SUN3_DMA_DELAY);
 201                         if(dregs->csr == 0x1400)
 202                                 break;
 203
 204                         dregs->csr = oldcsr;
 205                 }
 206
 207                 iounmap((void *)ioaddr);
 208                 ioaddr = 0;
 209         }
 210
 211         if(!ioaddr)
 212                 return 0;
 213
 214 #ifdef SUPPORT_TAGS
 215         if (setup_use_tagged_queuing < 0)
 216                 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
 217 #endif
 218
 219         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 220         if(instance == NULL)
 221                 return 0;
 222
 223         default_instance = instance;
 224
 225         instance->io_port = (unsigned long) ioaddr;
 226         instance->irq = irq;
 227
 228         NCR5380_init(instance, 0);
 229
 230         instance->n_io_port = 32;
 231
 232         ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
 233
 234         if (request_irq(instance->irq, scsi_sun3_intr,
 235                              0, "Sun3SCSI-5380VME", NULL)) {
 236 #ifndef REAL_DMA
 237                 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
 238                        instance->host_no, instance->irq);
 239                 instance->irq = SCSI_IRQ_NONE;
 240 #else
 241                 printk("scsi%d: IRQ%d not free, bailing out\n",
 242                        instance->host_no, instance->irq);
 243                 return 0;
 244 #endif
 245         }
 246
 247         printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port);
 248         if (instance->irq == SCSI_IRQ_NONE)
 249                 printk ("s disabled");
 250         else
 251                 printk (" %d", instance->irq);
 252         printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 253                instance->can_queue, instance->cmd_per_lun,
 254                SUN3SCSI_PUBLIC_RELEASE);
 255         printk("\nscsi%d:", instance->host_no);
 256         NCR5380_print_options(instance);
 257         printk("\n");
 258
 259         dregs->csr = 0;
 260         udelay(SUN3_DMA_DELAY);
 261         dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
 262         udelay(SUN3_DMA_DELAY);
 263         dregs->fifo_count = 0;
 264         dregs->fifo_count_hi = 0;
 265         dregs->dma_addr_hi = 0;
 266         dregs->dma_addr_lo = 0;
 267         dregs->dma_count_hi = 0;
 268         dregs->dma_count_lo = 0;
 269
 270         dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
 271
 272         called = 1;
 273
 274 #ifdef RESET_BOOT
 275         sun3_scsi_reset_boot(instance);
 276 #endif
 277
 278         return 1;
 279 }
 280
 281 #ifdef MODULE
 282 int sun3scsi_release (struct Scsi_Host *shpnt)
 283 {
 284         if (shpnt->irq != SCSI_IRQ_NONE)
 285                 free_irq (shpnt->irq, NULL);
 286
 287         iounmap(sun3_scsi_regp);
 288
 289         return 0;
 290 }
 291 #endif
 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 void scsi_sun3_intr(int irq, void *dummy, struct pt_regs *fp)
 347 {
 348         unsigned short csr = dregs->csr;
 349
 350         dregs->csr &= ~CSR_DMA_ENABLE;
 351
 352
 353 #ifdef SUN3_SCSI_DEBUG
 354         printk("scsi_intr csr %x\n", csr);
 355 #endif
 356
 357         if(csr & ~CSR_GOOD) {
 358                 if(csr & CSR_DMA_BUSERR) {
 359                         printk("scsi%d: bus error in dma\n", default_instance->host_no);
 360 #ifdef SUN3_SCSI_DEBUG
 361                         printk("scsi: residual %x count %x addr %p dmaaddr %x\n",
 362                                dregs->fifo_count,
 363                                dregs->dma_count_lo | (dregs->dma_count_hi << 16),
 364                                sun3_dma_orig_addr,
 365                                dregs->dma_addr_lo | (dregs->dma_addr_hi << 16));
 366 #endif
 367                 }
 368
 369                 if(csr & CSR_DMA_CONFLICT) {
 370                         printk("scsi%d: dma conflict\n", default_instance->host_no);
 371                 }
 372         }
 373
 374         if(csr & (CSR_SDB_INT | CSR_DMA_INT))
 375                 NCR5380_intr(irq, dummy, fp);
 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                         save_flags(flags);
 392                         cli();
 393                         NCR5380_print_status(default_instance);
 394                         restore_flags(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, Scsi_Cmnd *cmd,
 457                                     int write_flag)
 458 {
 459         if((cmd->request.cmd == 0) || (cmd->request.cmd == 1))
 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 Scsi_Host_Template driver_template = SUN3_NCR5380;
 566
 567 #include "scsi_module.c"
 568