drivers/scsi/sun3_scsi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl)
   4  *
   5  * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net)
   6  *
   7  * VME support added by Sam Creasey
   8  *
   9  * TODO: modify this driver to support multiple Sun3 SCSI VME boards
  10  *
  11  * Adapted from mac_scsinew.c:
  12  */
  13 /*
  14  * Generic Macintosh NCR5380 driver
  15  *
  16  * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
  17  *
  18  * derived in part from:
  19  */
  20 /*
  21  * Generic Generic NCR5380 driver
  22  *
  23  * Copyright 1995, Russell King
  24  */
  25
  26 #include <linux/types.h>
  27 #include <linux/delay.h>
  28 #include <linux/module.h>
  29 #include <linux/ioport.h>
  30 #include <linux/init.h>
  31 #include <linux/blkdev.h>
  32 #include <linux/platform_device.h>
  33
  34 #include <asm/io.h>
  35 #include <asm/dvma.h>
  36
  37 #include <scsi/scsi_host.h>
  38
  39 /* minimum number of bytes to do dma on */
  40 #define DMA_MIN_SIZE                    129
  41
  42 /* Definitions for the core NCR5380 driver. */
  43
  44 #define NCR5380_implementation_fields   /* none */
  45
  46 #define NCR5380_read(reg)               in_8(hostdata->io + (reg))
  47 #define NCR5380_write(reg, value)       out_8(hostdata->io + (reg), value)
  48
  49 #define NCR5380_queue_command           sun3scsi_queue_command
  50 #define NCR5380_host_reset              sun3scsi_host_reset
  51 #define NCR5380_abort                   sun3scsi_abort
  52 #define NCR5380_info                    sun3scsi_info
  53
  54 #define NCR5380_dma_xfer_len            sun3scsi_dma_xfer_len
  55 #define NCR5380_dma_recv_setup          sun3scsi_dma_count
  56 #define NCR5380_dma_send_setup          sun3scsi_dma_count
  57 #define NCR5380_dma_residual            sun3scsi_dma_residual
  58
  59 #include "NCR5380.h"
  60
  61 /* dma regs start at regbase + 8, directly after the NCR regs */
  62 struct sun3_dma_regs {
  63         unsigned short dma_addr_hi; /* vme only */
  64         unsigned short dma_addr_lo; /* vme only */
  65         unsigned short dma_count_hi; /* vme only */
  66         unsigned short dma_count_lo; /* vme only */
  67         unsigned short udc_data; /* udc dma data reg (obio only) */
  68         unsigned short udc_addr; /* uda dma addr reg (obio only) */
  69         unsigned short fifo_data; /* fifo data reg,
  70                                    * holds extra byte on odd dma reads
  71                                    */
  72         unsigned short fifo_count;
  73         unsigned short csr; /* control/status reg */
  74         unsigned short bpack_hi; /* vme only */
  75         unsigned short bpack_lo; /* vme only */
  76         unsigned short ivect; /* vme only */
  77         unsigned short fifo_count_hi; /* vme only */
  78 };
  79
  80 /* ucd chip specific regs - live in dvma space */
  81 struct sun3_udc_regs {
  82         unsigned short rsel; /* select regs to load */
  83         unsigned short addr_hi; /* high word of addr */
  84         unsigned short addr_lo; /* low word */
  85         unsigned short count; /* words to be xfer'd */
  86         unsigned short mode_hi; /* high word of channel mode */
  87         unsigned short mode_lo; /* low word of channel mode */
  88 };
  89
  90 /* addresses of the udc registers */
  91 #define UDC_MODE 0x38
  92 #define UDC_CSR 0x2e /* command/status */
  93 #define UDC_CHN_HI 0x26 /* chain high word */
  94 #define UDC_CHN_LO 0x22 /* chain lo word */
  95 #define UDC_CURA_HI 0x1a /* cur reg A high */
  96 #define UDC_CURA_LO 0x0a /* cur reg A low */
  97 #define UDC_CURB_HI 0x12 /* cur reg B high */
  98 #define UDC_CURB_LO 0x02 /* cur reg B low */
  99 #define UDC_MODE_HI 0x56 /* mode reg high */
 100 #define UDC_MODE_LO 0x52 /* mode reg low */
 101 #define UDC_COUNT 0x32 /* words to xfer */
 102
 103 /* some udc commands */
 104 #define UDC_RESET 0
 105 #define UDC_CHN_START 0xa0 /* start chain */
 106 #define UDC_INT_ENABLE 0x32 /* channel 1 int on */
 107
 108 /* udc mode words */
 109 #define UDC_MODE_HIWORD 0x40
 110 #define UDC_MODE_LSEND 0xc2
 111 #define UDC_MODE_LRECV 0xd2
 112
 113 /* udc reg selections */
 114 #define UDC_RSEL_SEND 0x282
 115 #define UDC_RSEL_RECV 0x182
 116
 117 /* bits in csr reg */
 118 #define CSR_DMA_ACTIVE 0x8000
 119 #define CSR_DMA_CONFLICT 0x4000
 120 #define CSR_DMA_BUSERR 0x2000
 121
 122 #define CSR_FIFO_EMPTY 0x400 /* fifo flushed? */
 123 #define CSR_SDB_INT 0x200 /* sbc interrupt pending */
 124 #define CSR_DMA_INT 0x100 /* dma interrupt pending */
 125
 126 #define CSR_LEFT 0xc0
 127 #define CSR_LEFT_3 0xc0
 128 #define CSR_LEFT_2 0x80
 129 #define CSR_LEFT_1 0x40
 130 #define CSR_PACK_ENABLE 0x20
 131
 132 #define CSR_DMA_ENABLE 0x10
 133
 134 #define CSR_SEND 0x8 /* 1 = send  0 = recv */
 135 #define CSR_FIFO 0x2 /* reset fifo */
 136 #define CSR_INTR 0x4 /* interrupt enable */
 137 #define CSR_SCSI 0x1
 138
 139 #define VME_DATA24 0x3d00
 140
 141 extern int sun3_map_test(unsigned long, char *);
 142
 143 static int setup_can_queue = -1;
 144 module_param(setup_can_queue, int, 0);
 145 static int setup_cmd_per_lun = -1;
 146 module_param(setup_cmd_per_lun, int, 0);
 147 static int setup_sg_tablesize = -1;
 148 module_param(setup_sg_tablesize, int, 0);
 149 static int setup_hostid = -1;
 150 module_param(setup_hostid, int, 0);
 151
 152 /* ms to wait after hitting dma regs */
 153 #define SUN3_DMA_DELAY 10
 154
 155 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
 156 #define SUN3_DVMA_BUFSIZE 0xe000
 157
 158 static struct scsi_cmnd *sun3_dma_setup_done;
 159 static volatile struct sun3_dma_regs *dregs;
 160 static struct sun3_udc_regs *udc_regs;
 161 static unsigned char *sun3_dma_orig_addr;
 162 static unsigned long sun3_dma_orig_count;
 163 static int sun3_dma_active;
 164 static unsigned long last_residual;
 165
 166 #ifndef SUN3_SCSI_VME
 167 /* dma controller register access functions */
 168
 169 static inline unsigned short sun3_udc_read(unsigned char reg)
 170 {
 171         unsigned short ret;
 172
 173         dregs->udc_addr = UDC_CSR;
 174         udelay(SUN3_DMA_DELAY);
 175         ret = dregs->udc_data;
 176         udelay(SUN3_DMA_DELAY);
 177
 178         return ret;
 179 }
 180
 181 static inline void sun3_udc_write(unsigned short val, unsigned char reg)
 182 {
 183         dregs->udc_addr = reg;
 184         udelay(SUN3_DMA_DELAY);
 185         dregs->udc_data = val;
 186         udelay(SUN3_DMA_DELAY);
 187 }
 188 #endif
 189
 190 // safe bits for the CSR
 191 #define CSR_GOOD 0x060f
 192
 193 static irqreturn_t scsi_sun3_intr(int irq, void *dev)
 194 {
 195         struct Scsi_Host *instance = dev;
 196         unsigned short csr = dregs->csr;
 197         int handled = 0;
 198
 199 #ifdef SUN3_SCSI_VME
 200         dregs->csr &= ~CSR_DMA_ENABLE;
 201 #endif
 202
 203         if(csr & ~CSR_GOOD) {
 204                 if (csr & CSR_DMA_BUSERR)
 205                         shost_printk(KERN_ERR, instance, "bus error in DMA\n");
 206                 if (csr & CSR_DMA_CONFLICT)
 207                         shost_printk(KERN_ERR, instance, "DMA conflict\n");
 208                 handled = 1;
 209         }
 210
 211         if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
 212                 NCR5380_intr(irq, dev);
 213                 handled = 1;
 214         }
 215
 216         return IRQ_RETVAL(handled);
 217 }
 218
 219 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
 220 static int sun3scsi_dma_setup(struct NCR5380_hostdata *hostdata,
 221                               unsigned char *data, int count, int write_flag)
 222 {
 223         void *addr;
 224
 225         if(sun3_dma_orig_addr != NULL)
 226                 dvma_unmap(sun3_dma_orig_addr);
 227
 228 #ifdef SUN3_SCSI_VME
 229         addr = (void *)dvma_map_vme((unsigned long) data, count);
 230 #else
 231         addr = (void *)dvma_map((unsigned long) data, count);
 232 #endif
 233
 234         sun3_dma_orig_addr = addr;
 235         sun3_dma_orig_count = count;
 236
 237 #ifndef SUN3_SCSI_VME
 238         dregs->fifo_count = 0;
 239         sun3_udc_write(UDC_RESET, UDC_CSR);
 240
 241         /* reset fifo */
 242         dregs->csr &= ~CSR_FIFO;
 243         dregs->csr |= CSR_FIFO;
 244 #endif
 245
 246         /* set direction */
 247         if(write_flag)
 248                 dregs->csr |= CSR_SEND;
 249         else
 250                 dregs->csr &= ~CSR_SEND;
 251
 252 #ifdef SUN3_SCSI_VME
 253         dregs->csr |= CSR_PACK_ENABLE;
 254
 255         dregs->dma_addr_hi = ((unsigned long)addr >> 16);
 256         dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
 257
 258         dregs->dma_count_hi = 0;
 259         dregs->dma_count_lo = 0;
 260         dregs->fifo_count_hi = 0;
 261         dregs->fifo_count = 0;
 262 #else
 263         /* byte count for fifo */
 264         dregs->fifo_count = count;
 265
 266         sun3_udc_write(UDC_RESET, UDC_CSR);
 267
 268         /* reset fifo */
 269         dregs->csr &= ~CSR_FIFO;
 270         dregs->csr |= CSR_FIFO;
 271
 272         if(dregs->fifo_count != count) {
 273                 shost_printk(KERN_ERR, hostdata->host,
 274                              "FIFO mismatch %04x not %04x\n",
 275                              dregs->fifo_count, (unsigned int) count);
 276                 NCR5380_dprint(NDEBUG_DMA, hostdata->host);
 277         }
 278
 279         /* setup udc */
 280         udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8);
 281         udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff);
 282         udc_regs->count = count/2; /* count in words */
 283         udc_regs->mode_hi = UDC_MODE_HIWORD;
 284         if(write_flag) {
 285                 if(count & 1)
 286                         udc_regs->count++;
 287                 udc_regs->mode_lo = UDC_MODE_LSEND;
 288                 udc_regs->rsel = UDC_RSEL_SEND;
 289         } else {
 290                 udc_regs->mode_lo = UDC_MODE_LRECV;
 291                 udc_regs->rsel = UDC_RSEL_RECV;
 292         }
 293
 294         /* announce location of regs block */
 295         sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8),
 296                        UDC_CHN_HI);
 297
 298         sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO);
 299
 300         /* set dma master on */
 301         sun3_udc_write(0xd, UDC_MODE);
 302
 303         /* interrupt enable */
 304         sun3_udc_write(UDC_INT_ENABLE, UDC_CSR);
 305 #endif
 306
 307         return count;
 308
 309 }
 310
 311 static int sun3scsi_dma_count(struct NCR5380_hostdata *hostdata,
 312                               unsigned char *data, int count)
 313 {
 314         return count;
 315 }
 316
 317 static inline int sun3scsi_dma_recv_setup(struct NCR5380_hostdata *hostdata,
 318                                           unsigned char *data, int count)
 319 {
 320         return sun3scsi_dma_setup(hostdata, data, count, 0);
 321 }
 322
 323 static inline int sun3scsi_dma_send_setup(struct NCR5380_hostdata *hostdata,
 324                                           unsigned char *data, int count)
 325 {
 326         return sun3scsi_dma_setup(hostdata, data, count, 1);
 327 }
 328
 329 static int sun3scsi_dma_residual(struct NCR5380_hostdata *hostdata)
 330 {
 331         return last_residual;
 332 }
 333
 334 static int sun3scsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
 335                                  struct scsi_cmnd *cmd)
 336 {
 337         int wanted_len = cmd->SCp.this_residual;
 338
 339         if (wanted_len < DMA_MIN_SIZE || blk_rq_is_passthrough(cmd->request))
 340                 return 0;
 341
 342         return wanted_len;
 343 }
 344
 345 static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data)
 346 {
 347 #ifdef SUN3_SCSI_VME
 348         unsigned short csr;
 349
 350         csr = dregs->csr;
 351
 352         dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
 353         dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
 354
 355         dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
 356         dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
 357
 358 /*      if(!(csr & CSR_DMA_ENABLE))
 359  *              dregs->csr |= CSR_DMA_ENABLE;
 360  */
 361 #else
 362     sun3_udc_write(UDC_CHN_START, UDC_CSR);
 363 #endif
 364
 365     return 0;
 366 }
 367
 368 /* clean up after our dma is done */
 369 static int sun3scsi_dma_finish(int write_flag)
 370 {
 371         unsigned short __maybe_unused count;
 372         unsigned short fifo;
 373         int ret = 0;
 374
 375         sun3_dma_active = 0;
 376
 377 #ifdef SUN3_SCSI_VME
 378         dregs->csr &= ~CSR_DMA_ENABLE;
 379
 380         fifo = dregs->fifo_count;
 381         if (write_flag) {
 382                 if ((fifo > 0) && (fifo < sun3_dma_orig_count))
 383                         fifo++;
 384         }
 385
 386         last_residual = fifo;
 387         /* empty bytes from the fifo which didn't make it */
 388         if ((!write_flag) && (dregs->csr & CSR_LEFT)) {
 389                 unsigned char *vaddr;
 390
 391                 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
 392
 393                 vaddr += (sun3_dma_orig_count - fifo);
 394                 vaddr--;
 395
 396                 switch (dregs->csr & CSR_LEFT) {
 397                 case CSR_LEFT_3:
 398                         *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
 399                         vaddr--;
 400                         /* Fall through */
 401
 402                 case CSR_LEFT_2:
 403                         *vaddr = (dregs->bpack_hi & 0x00ff);
 404                         vaddr--;
 405                         /* Fall through */
 406
 407                 case CSR_LEFT_1:
 408                         *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
 409                         break;
 410                 }
 411         }
 412 #else
 413         // check to empty the fifo on a read
 414         if(!write_flag) {
 415                 int tmo = 20000; /* .2 sec */
 416
 417                 while(1) {
 418                         if(dregs->csr & CSR_FIFO_EMPTY)
 419                                 break;
 420
 421                         if(--tmo <= 0) {
 422                                 printk("sun3scsi: fifo failed to empty!\n");
 423                                 return 1;
 424                         }
 425                         udelay(10);
 426                 }
 427         }
 428
 429         dregs->udc_addr = 0x32;
 430         udelay(SUN3_DMA_DELAY);
 431         count = 2 * dregs->udc_data;
 432         udelay(SUN3_DMA_DELAY);
 433
 434         fifo = dregs->fifo_count;
 435         last_residual = fifo;
 436
 437         /* empty bytes from the fifo which didn't make it */
 438         if((!write_flag) && (count - fifo) == 2) {
 439                 unsigned short data;
 440                 unsigned char *vaddr;
 441
 442                 data = dregs->fifo_data;
 443                 vaddr = (unsigned char *)dvma_btov(sun3_dma_orig_addr);
 444
 445                 vaddr += (sun3_dma_orig_count - fifo);
 446
 447                 vaddr[-2] = (data & 0xff00) >> 8;
 448                 vaddr[-1] = (data & 0xff);
 449         }
 450 #endif
 451
 452         dvma_unmap(sun3_dma_orig_addr);
 453         sun3_dma_orig_addr = NULL;
 454
 455 #ifdef SUN3_SCSI_VME
 456         dregs->dma_addr_hi = 0;
 457         dregs->dma_addr_lo = 0;
 458         dregs->dma_count_hi = 0;
 459         dregs->dma_count_lo = 0;
 460
 461         dregs->fifo_count = 0;
 462         dregs->fifo_count_hi = 0;
 463
 464         dregs->csr &= ~CSR_SEND;
 465 /*      dregs->csr |= CSR_DMA_ENABLE; */
 466 #else
 467         sun3_udc_write(UDC_RESET, UDC_CSR);
 468         dregs->fifo_count = 0;
 469         dregs->csr &= ~CSR_SEND;
 470
 471         /* reset fifo */
 472         dregs->csr &= ~CSR_FIFO;
 473         dregs->csr |= CSR_FIFO;
 474 #endif
 475
 476         sun3_dma_setup_done = NULL;
 477
 478         return ret;
 479
 480 }
 481
 482 #include "NCR5380.c"
 483
 484 #ifdef SUN3_SCSI_VME
 485 #define SUN3_SCSI_NAME          "Sun3 NCR5380 VME SCSI"
 486 #define DRV_MODULE_NAME         "sun3_scsi_vme"
 487 #else
 488 #define SUN3_SCSI_NAME          "Sun3 NCR5380 SCSI"
 489 #define DRV_MODULE_NAME         "sun3_scsi"
 490 #endif
 491
 492 #define PFX                     DRV_MODULE_NAME ": "
 493
 494 static struct scsi_host_template sun3_scsi_template = {
 495         .module                 = THIS_MODULE,
 496         .proc_name              = DRV_MODULE_NAME,
 497         .name                   = SUN3_SCSI_NAME,
 498         .info                   = sun3scsi_info,
 499         .queuecommand           = sun3scsi_queue_command,
 500         .eh_abort_handler       = sun3scsi_abort,
 501         .eh_host_reset_handler  = sun3scsi_host_reset,
 502         .can_queue              = 16,
 503         .this_id                = 7,
 504         .sg_tablesize           = SG_NONE,
 505         .cmd_per_lun            = 2,
 506         .dma_boundary           = PAGE_SIZE - 1,
 507         .cmd_size               = NCR5380_CMD_SIZE,
 508 };
 509
 510 static int __init sun3_scsi_probe(struct platform_device *pdev)
 511 {
 512         struct Scsi_Host *instance;
 513         struct NCR5380_hostdata *hostdata;
 514         int error;
 515         struct resource *irq, *mem;
 516         void __iomem *ioaddr;
 517         int host_flags = 0;
 518 #ifdef SUN3_SCSI_VME
 519         int i;
 520 #endif
 521
 522         if (setup_can_queue > 0)
 523                 sun3_scsi_template.can_queue = setup_can_queue;
 524         if (setup_cmd_per_lun > 0)
 525                 sun3_scsi_template.cmd_per_lun = setup_cmd_per_lun;
 526         if (setup_sg_tablesize >= 0)
 527                 sun3_scsi_template.sg_tablesize = setup_sg_tablesize;
 528         if (setup_hostid >= 0)
 529                 sun3_scsi_template.this_id = setup_hostid & 7;
 530
 531 #ifdef SUN3_SCSI_VME
 532         ioaddr = NULL;
 533         for (i = 0; i < 2; i++) {
 534                 unsigned char x;
 535
 536                 irq = platform_get_resource(pdev, IORESOURCE_IRQ, i);
 537                 mem = platform_get_resource(pdev, IORESOURCE_MEM, i);
 538                 if (!irq || !mem)
 539                         break;
 540
 541                 ioaddr = sun3_ioremap(mem->start, resource_size(mem),
 542                                       SUN3_PAGE_TYPE_VME16);
 543                 dregs = (struct sun3_dma_regs *)(ioaddr + 8);
 544
 545                 if (sun3_map_test((unsigned long)dregs, &x)) {
 546                         unsigned short oldcsr;
 547
 548                         oldcsr = dregs->csr;
 549                         dregs->csr = 0;
 550                         udelay(SUN3_DMA_DELAY);
 551                         if (dregs->csr == 0x1400)
 552                                 break;
 553
 554                         dregs->csr = oldcsr;
 555                 }
 556
 557                 iounmap(ioaddr);
 558                 ioaddr = NULL;
 559         }
 560         if (!ioaddr)
 561                 return -ENODEV;
 562 #else
 563         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 564         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 565         if (!irq || !mem)
 566                 return -ENODEV;
 567
 568         ioaddr = ioremap(mem->start, resource_size(mem));
 569         dregs = (struct sun3_dma_regs *)(ioaddr + 8);
 570
 571         udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs));
 572         if (!udc_regs) {
 573                 pr_err(PFX "couldn't allocate DVMA memory!\n");
 574                 iounmap(ioaddr);
 575                 return -ENOMEM;
 576         }
 577 #endif
 578
 579         instance = scsi_host_alloc(&sun3_scsi_template,
 580                                    sizeof(struct NCR5380_hostdata));
 581         if (!instance) {
 582                 error = -ENOMEM;
 583                 goto fail_alloc;
 584         }
 585
 586         instance->irq = irq->start;
 587
 588         hostdata = shost_priv(instance);
 589         hostdata->base = mem->start;
 590         hostdata->io = ioaddr;
 591
 592         error = NCR5380_init(instance, host_flags);
 593         if (error)
 594                 goto fail_init;
 595
 596         error = request_irq(instance->irq, scsi_sun3_intr, 0,
 597                             "NCR5380", instance);
 598         if (error) {
 599                 pr_err(PFX "scsi%d: IRQ %d not free, bailing out\n",
 600                        instance->host_no, instance->irq);
 601                 goto fail_irq;
 602         }
 603
 604         dregs->csr = 0;
 605         udelay(SUN3_DMA_DELAY);
 606         dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
 607         udelay(SUN3_DMA_DELAY);
 608         dregs->fifo_count = 0;
 609 #ifdef SUN3_SCSI_VME
 610         dregs->fifo_count_hi = 0;
 611         dregs->dma_addr_hi = 0;
 612         dregs->dma_addr_lo = 0;
 613         dregs->dma_count_hi = 0;
 614         dregs->dma_count_lo = 0;
 615
 616         dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
 617 #endif
 618
 619         NCR5380_maybe_reset_bus(instance);
 620
 621         error = scsi_add_host(instance, NULL);
 622         if (error)
 623                 goto fail_host;
 624
 625         platform_set_drvdata(pdev, instance);
 626
 627         scsi_scan_host(instance);
 628         return 0;
 629
 630 fail_host:
 631         free_irq(instance->irq, instance);
 632 fail_irq:
 633         NCR5380_exit(instance);
 634 fail_init:
 635         scsi_host_put(instance);
 636 fail_alloc:
 637         if (udc_regs)
 638                 dvma_free(udc_regs);
 639         iounmap(ioaddr);
 640         return error;
 641 }
 642
 643 static int __exit sun3_scsi_remove(struct platform_device *pdev)
 644 {
 645         struct Scsi_Host *instance = platform_get_drvdata(pdev);
 646         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 647         void __iomem *ioaddr = hostdata->io;
 648
 649         scsi_remove_host(instance);
 650         free_irq(instance->irq, instance);
 651         NCR5380_exit(instance);
 652         scsi_host_put(instance);
 653         if (udc_regs)
 654                 dvma_free(udc_regs);
 655         iounmap(ioaddr);
 656         return 0;
 657 }
 658
 659 static struct platform_driver sun3_scsi_driver = {
 660         .remove = __exit_p(sun3_scsi_remove),
 661         .driver = {
 662                 .name   = DRV_MODULE_NAME,
 663         },
 664 };
 665
 666 module_platform_driver_probe(sun3_scsi_driver, sun3_scsi_probe);
 667
 668 MODULE_ALIAS("platform:" DRV_MODULE_NAME);
 669 MODULE_LICENSE("GPL");