drivers/scsi/oktagon_esp.c

   1 /*
   2  * Oktagon_esp.c -- Driver for bsc Oktagon
   3  *
   4  * Written by Carsten Pluntke 1998
   5  *
   6  * Based on cyber_esp.c
   7  */
   8
   9 #include <linux/config.h>
  10
  11 #if defined(CONFIG_AMIGA) || defined(CONFIG_APUS)
  12 #define USE_BOTTOM_HALF
  13 #endif
  14
  15 #include <linux/module.h>
  16
  17 #include <linux/kernel.h>
  18 #include <linux/delay.h>
  19 #include <linux/types.h>
  20 #include <linux/string.h>
  21 #include <linux/slab.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/stat.h>
  25 #include <linux/reboot.h>
  26 #include <asm/system.h>
  27 #include <asm/ptrace.h>
  28 #include <asm/pgtable.h>
  29
  30
  31 #include "scsi.h"
  32 #include <scsi/scsi_host.h>
  33 #include "NCR53C9x.h"
  34
  35 #include <linux/zorro.h>
  36 #include <asm/irq.h>
  37 #include <asm/amigaints.h>
  38 #include <asm/amigahw.h>
  39
  40 #ifdef USE_BOTTOM_HALF
  41 #include <linux/workqueue.h>
  42 #include <linux/interrupt.h>
  43 #endif
  44
  45 /* The controller registers can be found in the Z2 config area at these
  46  * offsets:
  47  */
  48 #define OKTAGON_ESP_ADDR 0x03000
  49 #define OKTAGON_DMA_ADDR 0x01000
  50
  51
  52 static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
  53 static int  dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
  54 static void dma_dump_state(struct NCR_ESP *esp);
  55 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length);
  56 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length);
  57 static void dma_ints_off(struct NCR_ESP *esp);
  58 static void dma_ints_on(struct NCR_ESP *esp);
  59 static int  dma_irq_p(struct NCR_ESP *esp);
  60 static void dma_led_off(struct NCR_ESP *esp);
  61 static void dma_led_on(struct NCR_ESP *esp);
  62 static int  dma_ports_p(struct NCR_ESP *esp);
  63 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
  64
  65 static void dma_irq_exit(struct NCR_ESP *esp);
  66 static void dma_invalidate(struct NCR_ESP *esp);
  67
  68 static void dma_mmu_get_scsi_one(struct NCR_ESP *,Scsi_Cmnd *);
  69 static void dma_mmu_get_scsi_sgl(struct NCR_ESP *,Scsi_Cmnd *);
  70 static void dma_mmu_release_scsi_one(struct NCR_ESP *,Scsi_Cmnd *);
  71 static void dma_mmu_release_scsi_sgl(struct NCR_ESP *,Scsi_Cmnd *);
  72 static void dma_advance_sg(Scsi_Cmnd *);
  73 static int  oktagon_notify_reboot(struct notifier_block *this, unsigned long code, void *x);
  74
  75 void esp_bootup_reset(struct NCR_ESP *esp,struct ESP_regs *eregs);
  76
  77 #ifdef USE_BOTTOM_HALF
  78 static void dma_commit(void *opaque);
  79
  80 long oktag_to_io(long *paddr, long *addr, long len);
  81 long oktag_from_io(long *addr, long *paddr, long len);
  82
  83 static DECLARE_WORK(tq_fake_dma, dma_commit, NULL);
  84
  85 #define DMA_MAXTRANSFER 0x8000
  86
  87 #else
  88
  89 /*
  90  * No bottom half. Use transfer directly from IRQ. Find a narrow path
  91  * between too much IRQ overhead and clogging the IRQ for too long.
  92  */
  93
  94 #define DMA_MAXTRANSFER 0x1000
  95
  96 #endif
  97
  98 static struct notifier_block oktagon_notifier = {
  99         oktagon_notify_reboot,
 100         NULL,
 101         0
 102 };
 103
 104 static long *paddress;
 105 static long *address;
 106 static long len;
 107 static long dma_on;
 108 static int direction;
 109 static struct NCR_ESP *current_esp;
 110
 111
 112 static volatile unsigned char cmd_buffer[16];
 113                                 /* This is where all commands are put
 114                                  * before they are trasfered to the ESP chip
 115                                  * via PIO.
 116                                  */
 117
 118 /***************************************************************** Detection */
 119 int oktagon_esp_detect(Scsi_Host_Template *tpnt)
 120 {
 121         struct NCR_ESP *esp;
 122         struct zorro_dev *z = NULL;
 123         unsigned long address;
 124         struct ESP_regs *eregs;
 125
 126         while ((z = zorro_find_device(ZORRO_PROD_BSC_OKTAGON_2008, z))) {
 127             unsigned long board = z->resource.start;
 128             if (request_mem_region(board+OKTAGON_ESP_ADDR,
 129                                    sizeof(struct ESP_regs), "NCR53C9x")) {
 130                 /*
 131                  * It is a SCSI controller.
 132                  * Hardwire Host adapter to SCSI ID 7
 133                  */
 134
 135                 address = (unsigned long)ZTWO_VADDR(board);
 136                 eregs = (struct ESP_regs *)(address + OKTAGON_ESP_ADDR);
 137
 138                 /* This line was 5 lines lower */
 139                 esp = esp_allocate(tpnt, (void *)board+OKTAGON_ESP_ADDR);
 140
 141                 /* we have to shift the registers only one bit for oktagon */
 142                 esp->shift = 1;
 143
 144                 esp_write(eregs->esp_cfg1, (ESP_CONFIG1_PENABLE | 7));
 145                 udelay(5);
 146                 if (esp_read(eregs->esp_cfg1) != (ESP_CONFIG1_PENABLE | 7))
 147                         return 0; /* Bail out if address did not hold data */
 148
 149                 /* Do command transfer with programmed I/O */
 150                 esp->do_pio_cmds = 1;
 151
 152                 /* Required functions */
 153                 esp->dma_bytes_sent = &dma_bytes_sent;
 154                 esp->dma_can_transfer = &dma_can_transfer;
 155                 esp->dma_dump_state = &dma_dump_state;
 156                 esp->dma_init_read = &dma_init_read;
 157                 esp->dma_init_write = &dma_init_write;
 158                 esp->dma_ints_off = &dma_ints_off;
 159                 esp->dma_ints_on = &dma_ints_on;
 160                 esp->dma_irq_p = &dma_irq_p;
 161                 esp->dma_ports_p = &dma_ports_p;
 162                 esp->dma_setup = &dma_setup;
 163
 164                 /* Optional functions */
 165                 esp->dma_barrier = 0;
 166                 esp->dma_drain = 0;
 167                 esp->dma_invalidate = &dma_invalidate;
 168                 esp->dma_irq_entry = 0;
 169                 esp->dma_irq_exit = &dma_irq_exit;
 170                 esp->dma_led_on = &dma_led_on;
 171                 esp->dma_led_off = &dma_led_off;
 172                 esp->dma_poll = 0;
 173                 esp->dma_reset = 0;
 174
 175                 esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
 176                 esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
 177                 esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
 178                 esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
 179                 esp->dma_advance_sg = &dma_advance_sg;
 180
 181                 /* SCSI chip speed */
 182                 /* Looking at the quartz of the SCSI board... */
 183                 esp->cfreq = 25000000;
 184
 185                 /* The DMA registers on the CyberStorm are mapped
 186                  * relative to the device (i.e. in the same Zorro
 187                  * I/O block).
 188                  */
 189                 esp->dregs = (void *)(address + OKTAGON_DMA_ADDR);
 190
 191                 paddress = (long *) esp->dregs;
 192
 193                 /* ESP register base */
 194                 esp->eregs = eregs;
 195
 196                 /* Set the command buffer */
 197                 esp->esp_command = (volatile unsigned char*) cmd_buffer;
 198
 199                 /* Yes, the virtual address. See below. */
 200                 esp->esp_command_dvma = (__u32) cmd_buffer;
 201
 202                 esp->irq = IRQ_AMIGA_PORTS;
 203                 request_irq(IRQ_AMIGA_PORTS, esp_intr, SA_SHIRQ,
 204                             "BSC Oktagon SCSI", esp->ehost);
 205
 206                 /* Figure out our scsi ID on the bus */
 207                 esp->scsi_id = 7;
 208
 209                 /* We don't have a differential SCSI-bus. */
 210                 esp->diff = 0;
 211
 212                 esp_initialize(esp);
 213
 214                 printk("ESP_Oktagon Driver 1.1"
 215 #ifdef USE_BOTTOM_HALF
 216                        " [BOTTOM_HALF]"
 217 #else
 218                        " [IRQ]"
 219 #endif
 220                        " registered.\n");
 221                 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
 222                 esps_running = esps_in_use;
 223                 current_esp = esp;
 224                 register_reboot_notifier(&oktagon_notifier);
 225                 return esps_in_use;
 226             }
 227         }
 228         return 0;
 229 }
 230
 231
 232 /*
 233  * On certain configurations the SCSI equipment gets confused on reboot,
 234  * so we have to reset it then.
 235  */
 236
 237 static int
 238 oktagon_notify_reboot(struct notifier_block *this, unsigned long code, void *x)
 239 {
 240   struct NCR_ESP *esp;
 241
 242   if((code == SYS_DOWN || code == SYS_HALT) && (esp = current_esp))
 243    {
 244     esp_bootup_reset(esp,esp->eregs);
 245     udelay(500); /* Settle time. Maybe unnecessary. */
 246    }
 247   return NOTIFY_DONE;
 248 }
 249
 250
 251
 252 #ifdef USE_BOTTOM_HALF
 253
 254
 255 /*
 256  * The bsc Oktagon controller has no real DMA, so we have to do the 'DMA
 257  * transfer' in the interrupt (Yikes!) or use a bottom half to not to clutter
 258  * IRQ's for longer-than-good.
 259  *
 260  * FIXME
 261  * BIG PROBLEM: 'len' is usually the buffer length, not the expected length
 262  * of the data. So DMA may finish prematurely, further reads lead to
 263  * 'machine check' on APUS systems (don't know about m68k systems, AmigaOS
 264  * deliberately ignores the bus faults) and a normal copy-loop can't
 265  * be exited prematurely just at the right moment by the dma_invalidate IRQ.
 266  * So do it the hard way, write an own copier in assembler and
 267  * catch the exception.
 268  *                                     -- Carsten
 269  */
 270
 271
 272 static void dma_commit(void *opaque)
 273 {
 274     long wait,len2,pos;
 275     struct NCR_ESP *esp;
 276
 277     ESPDATA(("Transfer: %ld bytes, Address 0x%08lX, Direction: %d\n",
 278          len,(long) address,direction));
 279     dma_ints_off(current_esp);
 280
 281     pos = 0;
 282     wait = 1;
 283     if(direction) /* write? (memory to device) */
 284      {
 285       while(len > 0)
 286        {
 287         len2 = oktag_to_io(paddress, address+pos, len);
 288         if(!len2)
 289          {
 290           if(wait > 1000)
 291            {
 292             printk("Expedited DMA exit (writing) %ld\n",len);
 293             break;
 294            }
 295           mdelay(wait);
 296           wait *= 2;
 297          }
 298         pos += len2;
 299         len -= len2*sizeof(long);
 300        }
 301      } else {
 302       while(len > 0)
 303        {
 304         len2 = oktag_from_io(address+pos, paddress, len);
 305         if(!len2)
 306          {
 307           if(wait > 1000)
 308            {
 309             printk("Expedited DMA exit (reading) %ld\n",len);
 310             break;
 311            }
 312           mdelay(wait);
 313           wait *= 2;
 314          }
 315         pos += len2;
 316         len -= len2*sizeof(long);
 317        }
 318      }
 319
 320     /* to make esp->shift work */
 321     esp=current_esp;
 322
 323 #if 0
 324     len2 = (esp_read(current_esp->eregs->esp_tclow) & 0xff) |
 325            ((esp_read(current_esp->eregs->esp_tcmed) & 0xff) << 8);
 326
 327     /*
 328      * Uh uh. If you see this, len and transfer count registers were out of
 329      * sync. That means really serious trouble.
 330      */
 331
 332     if(len2)
 333       printk("Eeeek!! Transfer count still %ld!\n",len2);
 334 #endif
 335
 336     /*
 337      * Normally we just need to exit and wait for the interrupt to come.
 338      * But at least one device (my Microtek ScanMaker 630) regularly mis-
 339      * calculates the bytes it should send which is really ugly because
 340      * it locks up the SCSI bus if not accounted for.
 341      */
 342
 343     if(!(esp_read(current_esp->eregs->esp_status) & ESP_STAT_INTR))
 344      {
 345       long len = 100;
 346       long trash[10];
 347
 348       /*
 349        * Interrupt bit was not set. Either the device is just plain lazy
 350        * so we give it a 10 ms chance or...
 351        */
 352       while(len-- && (!(esp_read(current_esp->eregs->esp_status) & ESP_STAT_INTR)))
 353         udelay(100);
 354
 355
 356       if(!(esp_read(current_esp->eregs->esp_status) & ESP_STAT_INTR))
 357        {
 358         /*
 359          * So we think that the transfer count is out of sync. Since we
 360          * have all we want we are happy and can ditch the trash.
 361          */
 362
 363         len = DMA_MAXTRANSFER;
 364
 365         while(len-- && (!(esp_read(current_esp->eregs->esp_status) & ESP_STAT_INTR)))
 366           oktag_from_io(trash,paddress,2);
 367
 368         if(!(esp_read(current_esp->eregs->esp_status) & ESP_STAT_INTR))
 369          {
 370           /*
 371            * Things really have gone wrong. If we leave the system in that
 372            * state, the SCSI bus is locked forever. I hope that this will
 373            * turn the system in a more or less running state.
 374            */
 375           printk("Device is bolixed, trying bus reset...\n");
 376           esp_bootup_reset(current_esp,current_esp->eregs);
 377          }
 378        }
 379      }
 380
 381     ESPDATA(("Transfer_finale: do_data_finale should come\n"));
 382
 383     len = 0;
 384     dma_on = 0;
 385     dma_ints_on(current_esp);
 386 }
 387
 388 #endif
 389
 390 /************************************************************* DMA Functions */
 391 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 392 {
 393         /* Since the CyberStorm DMA is fully dedicated to the ESP chip,
 394          * the number of bytes sent (to the ESP chip) equals the number
 395          * of bytes in the FIFO - there is no buffering in the DMA controller.
 396          * XXXX Do I read this right? It is from host to ESP, right?
 397          */
 398         return fifo_count;
 399 }
 400
 401 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 402 {
 403         unsigned long sz = sp->SCp.this_residual;
 404         if(sz > DMA_MAXTRANSFER)
 405                 sz = DMA_MAXTRANSFER;
 406         return sz;
 407 }
 408
 409 static void dma_dump_state(struct NCR_ESP *esp)
 410 {
 411 }
 412
 413 /*
 414  * What the f$@& is this?
 415  *
 416  * Some SCSI devices (like my Microtek ScanMaker 630 scanner) want to transfer
 417  * more data than requested. How much? Dunno. So ditch the bogus data into
 418  * the sink, hoping the device will advance to the next phase sooner or later.
 419  *
 420  *                         -- Carsten
 421  */
 422
 423 static long oktag_eva_buffer[16]; /* The data sink */
 424
 425 static void oktag_check_dma(void)
 426 {
 427   struct NCR_ESP *esp;
 428
 429   esp=current_esp;
 430   if(!len)
 431    {
 432     address = oktag_eva_buffer;
 433     len = 2;
 434     /* esp_do_data sets them to zero like len */
 435     esp_write(current_esp->eregs->esp_tclow,2);
 436     esp_write(current_esp->eregs->esp_tcmed,0);
 437    }
 438 }
 439
 440 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
 441 {
 442         /* Zorro is noncached, everything else done using processor. */
 443         /* cache_clear(addr, length); */
 444
 445         if(dma_on)
 446           panic("dma_init_read while dma process is initialized/running!\n");
 447         direction = 0;
 448         address = (long *) vaddress;
 449         current_esp = esp;
 450         len = length;
 451         oktag_check_dma();
 452         dma_on = 1;
 453 }
 454
 455 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
 456 {
 457         /* cache_push(addr, length); */
 458
 459         if(dma_on)
 460           panic("dma_init_write while dma process is initialized/running!\n");
 461         direction = 1;
 462         address = (long *) vaddress;
 463         current_esp = esp;
 464         len = length;
 465         oktag_check_dma();
 466         dma_on = 1;
 467 }
 468
 469 static void dma_ints_off(struct NCR_ESP *esp)
 470 {
 471         disable_irq(esp->irq);
 472 }
 473
 474 static void dma_ints_on(struct NCR_ESP *esp)
 475 {
 476         enable_irq(esp->irq);
 477 }
 478
 479 static int dma_irq_p(struct NCR_ESP *esp)
 480 {
 481         /* It's important to check the DMA IRQ bit in the correct way! */
 482         return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
 483 }
 484
 485 static void dma_led_off(struct NCR_ESP *esp)
 486 {
 487 }
 488
 489 static void dma_led_on(struct NCR_ESP *esp)
 490 {
 491 }
 492
 493 static int dma_ports_p(struct NCR_ESP *esp)
 494 {
 495         return ((custom.intenar) & IF_PORTS);
 496 }
 497
 498 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
 499 {
 500         /* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
 501          * so when (write) is true, it actually means READ!
 502          */
 503         if(write){
 504                 dma_init_read(esp, addr, count);
 505         } else {
 506                 dma_init_write(esp, addr, count);
 507         }
 508 }
 509
 510 /*
 511  * IRQ entry when DMA transfer is ready to be started
 512  */
 513
 514 static void dma_irq_exit(struct NCR_ESP *esp)
 515 {
 516 #ifdef USE_BOTTOM_HALF
 517         if(dma_on)
 518          {
 519           schedule_work(&tq_fake_dma);
 520          }
 521 #else
 522         while(len && !dma_irq_p(esp))
 523          {
 524           if(direction)
 525             *paddress = *address++;
 526            else
 527             *address++ = *paddress;
 528           len -= (sizeof(long));
 529          }
 530         len = 0;
 531         dma_on = 0;
 532 #endif
 533 }
 534
 535 /*
 536  * IRQ entry when DMA has just finished
 537  */
 538
 539 static void dma_invalidate(struct NCR_ESP *esp)
 540 {
 541 }
 542
 543 /*
 544  * Since the processor does the data transfer we have to use the custom
 545  * mmu interface to pass the virtual address, not the physical.
 546  */
 547
 548 void dma_mmu_get_scsi_one(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 549 {
 550         sp->SCp.ptr =
 551                 sp->request_buffer;
 552 }
 553
 554 void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 555 {
 556         sp->SCp.ptr = page_address(sp->SCp.buffer->page)+
 557                       sp->SCp.buffer->offset;
 558 }
 559
 560 void dma_mmu_release_scsi_one(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 561 {
 562 }
 563
 564 void dma_mmu_release_scsi_sgl(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 565 {
 566 }
 567
 568 void dma_advance_sg(Scsi_Cmnd *sp)
 569 {
 570         sp->SCp.ptr = page_address(sp->SCp.buffer->page)+
 571                       sp->SCp.buffer->offset;
 572 }
 573
 574
 575 #define HOSTS_C
 576
 577 int oktagon_esp_release(struct Scsi_Host *instance)
 578 {
 579 #ifdef MODULE
 580         unsigned long address = (unsigned long)((struct NCR_ESP *)instance->hostdata)->edev;
 581         esp_release();
 582         release_mem_region(address, sizeof(struct ESP_regs));
 583         free_irq(IRQ_AMIGA_PORTS, esp_intr);
 584         unregister_reboot_notifier(&oktagon_notifier);
 585 #endif
 586         return 1;
 587 }
 588
 589
 590 static Scsi_Host_Template driver_template = {
 591         .proc_name              = "esp-oktagon",
 592         .proc_info              = &esp_proc_info,
 593         .name                   = "BSC Oktagon SCSI",
 594         .detect                 = oktagon_esp_detect,
 595         .slave_alloc            = esp_slave_alloc,
 596         .slave_destroy          = esp_slave_destroy,
 597         .release                = oktagon_esp_release,
 598         .queuecommand           = esp_queue,
 599         .eh_abort_handler       = esp_abort,
 600         .eh_bus_reset_handler   = esp_reset,
 601         .can_queue              = 7,
 602         .this_id                = 7,
 603         .sg_tablesize           = SG_ALL,
 604         .cmd_per_lun            = 1,
 605         .use_clustering         = ENABLE_CLUSTERING
 606 };
 607
 608
 609 #include "scsi_module.c"
 610
 611 MODULE_LICENSE("GPL");