include/asm-sparc64/floppy.h

   1 /* floppy.h: Sparc specific parts of the Floppy driver.
   2  *
   3  * Copyright (C) 1996, 2007 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  *
   6  * Ultra/PCI support added: Sep 1997  Eddie C. Dost  (ecd@skynet.be)
   7  */
   8
   9 #ifndef __ASM_SPARC64_FLOPPY_H
  10 #define __ASM_SPARC64_FLOPPY_H
  11
  12 #include <linux/init.h>
  13 #include <linux/pci.h>
  14
  15 #include <asm/page.h>
  16 #include <asm/pgtable.h>
  17 #include <asm/system.h>
  18 #include <asm/idprom.h>
  19 #include <asm/oplib.h>
  20 #include <asm/auxio.h>
  21 #include <asm/sbus.h>
  22 #include <asm/irq.h>
  23
  24
  25 /*
  26  * Define this to enable exchanging drive 0 and 1 if only drive 1 is
  27  * probed on PCI machines.
  28  */
  29 #undef PCI_FDC_SWAP_DRIVES
  30
  31
  32 /* References:
  33  * 1) Netbsd Sun floppy driver.
  34  * 2) NCR 82077 controller manual
  35  * 3) Intel 82077 controller manual
  36  */
  37 struct sun_flpy_controller {
  38         volatile unsigned char status1_82077; /* Auxiliary Status reg. 1 */
  39         volatile unsigned char status2_82077; /* Auxiliary Status reg. 2 */
  40         volatile unsigned char dor_82077;     /* Digital Output reg. */
  41         volatile unsigned char tapectl_82077; /* Tape Control reg */
  42         volatile unsigned char status_82077;  /* Main Status Register. */
  43 #define drs_82077              status_82077   /* Digital Rate Select reg. */
  44         volatile unsigned char data_82077;    /* Data fifo. */
  45         volatile unsigned char ___unused;
  46         volatile unsigned char dir_82077;     /* Digital Input reg. */
  47 #define dcr_82077              dir_82077      /* Config Control reg. */
  48 };
  49
  50 /* You'll only ever find one controller on an Ultra anyways. */
  51 static struct sun_flpy_controller *sun_fdc = (struct sun_flpy_controller *)-1;
  52 unsigned long fdc_status;
  53 static struct sbus_dev *floppy_sdev = NULL;
  54
  55 struct sun_floppy_ops {
  56         unsigned char   (*fd_inb) (unsigned long port);
  57         void            (*fd_outb) (unsigned char value, unsigned long port);
  58         void            (*fd_enable_dma) (void);
  59         void            (*fd_disable_dma) (void);
  60         void            (*fd_set_dma_mode) (int);
  61         void            (*fd_set_dma_addr) (char *);
  62         void            (*fd_set_dma_count) (int);
  63         unsigned int    (*get_dma_residue) (void);
  64         int             (*fd_request_irq) (void);
  65         void            (*fd_free_irq) (void);
  66         int             (*fd_eject) (int);
  67 };
  68
  69 static struct sun_floppy_ops sun_fdops;
  70
  71 #define fd_inb(port)              sun_fdops.fd_inb(port)
  72 #define fd_outb(value,port)       sun_fdops.fd_outb(value,port)
  73 #define fd_enable_dma()           sun_fdops.fd_enable_dma()
  74 #define fd_disable_dma()          sun_fdops.fd_disable_dma()
  75 #define fd_request_dma()          (0) /* nothing... */
  76 #define fd_free_dma()             /* nothing... */
  77 #define fd_clear_dma_ff()         /* nothing... */
  78 #define fd_set_dma_mode(mode)     sun_fdops.fd_set_dma_mode(mode)
  79 #define fd_set_dma_addr(addr)     sun_fdops.fd_set_dma_addr(addr)
  80 #define fd_set_dma_count(count)   sun_fdops.fd_set_dma_count(count)
  81 #define get_dma_residue(x)        sun_fdops.get_dma_residue()
  82 #define fd_cacheflush(addr, size) /* nothing... */
  83 #define fd_request_irq()          sun_fdops.fd_request_irq()
  84 #define fd_free_irq()             sun_fdops.fd_free_irq()
  85 #define fd_eject(drive)           sun_fdops.fd_eject(drive)
  86
  87 /* Super paranoid... */
  88 #undef HAVE_DISABLE_HLT
  89
  90 static int sun_floppy_types[2] = { 0, 0 };
  91
  92 /* Here is where we catch the floppy driver trying to initialize,
  93  * therefore this is where we call the PROM device tree probing
  94  * routine etc. on the Sparc.
  95  */
  96 #define FLOPPY0_TYPE            sun_floppy_init()
  97 #define FLOPPY1_TYPE            sun_floppy_types[1]
  98
  99 #define FDC1                    ((unsigned long)sun_fdc)
 100
 101 #define N_FDC    1
 102 #define N_DRIVE  8
 103
 104 /* No 64k boundary crossing problems on the Sparc. */
 105 #define CROSS_64KB(a,s) (0)
 106
 107 static unsigned char sun_82077_fd_inb(unsigned long port)
 108 {
 109         udelay(5);
 110         switch(port & 7) {
 111         default:
 112                 printk("floppy: Asked to read unknown port %lx\n", port);
 113                 panic("floppy: Port bolixed.");
 114         case 4: /* FD_STATUS */
 115                 return sbus_readb(&sun_fdc->status_82077) & ~STATUS_DMA;
 116         case 5: /* FD_DATA */
 117                 return sbus_readb(&sun_fdc->data_82077);
 118         case 7: /* FD_DIR */
 119                 /* XXX: Is DCL on 0x80 in sun4m? */
 120                 return sbus_readb(&sun_fdc->dir_82077);
 121         };
 122         panic("sun_82072_fd_inb: How did I get here?");
 123 }
 124
 125 static void sun_82077_fd_outb(unsigned char value, unsigned long port)
 126 {
 127         udelay(5);
 128         switch(port & 7) {
 129         default:
 130                 printk("floppy: Asked to write to unknown port %lx\n", port);
 131                 panic("floppy: Port bolixed.");
 132         case 2: /* FD_DOR */
 133                 /* Happily, the 82077 has a real DOR register. */
 134                 sbus_writeb(value, &sun_fdc->dor_82077);
 135                 break;
 136         case 5: /* FD_DATA */
 137                 sbus_writeb(value, &sun_fdc->data_82077);
 138                 break;
 139         case 7: /* FD_DCR */
 140                 sbus_writeb(value, &sun_fdc->dcr_82077);
 141                 break;
 142         case 4: /* FD_STATUS */
 143                 sbus_writeb(value, &sun_fdc->status_82077);
 144                 break;
 145         };
 146         return;
 147 }
 148
 149 /* For pseudo-dma (Sun floppy drives have no real DMA available to
 150  * them so we must eat the data fifo bytes directly ourselves) we have
 151  * three state variables.  doing_pdma tells our inline low-level
 152  * assembly floppy interrupt entry point whether it should sit and eat
 153  * bytes from the fifo or just transfer control up to the higher level
 154  * floppy interrupt c-code.  I tried very hard but I could not get the
 155  * pseudo-dma to work in c-code without getting many overruns and
 156  * underruns.  If non-zero, doing_pdma encodes the direction of
 157  * the transfer for debugging.  1=read 2=write
 158  */
 159 unsigned char *pdma_vaddr;
 160 unsigned long pdma_size;
 161 volatile int doing_pdma = 0;
 162
 163 /* This is software state */
 164 char *pdma_base = NULL;
 165 unsigned long pdma_areasize;
 166
 167 /* Common routines to all controller types on the Sparc. */
 168 static void sun_fd_disable_dma(void)
 169 {
 170         doing_pdma = 0;
 171         if (pdma_base) {
 172                 mmu_unlockarea(pdma_base, pdma_areasize);
 173                 pdma_base = NULL;
 174         }
 175 }
 176
 177 static void sun_fd_set_dma_mode(int mode)
 178 {
 179         switch(mode) {
 180         case DMA_MODE_READ:
 181                 doing_pdma = 1;
 182                 break;
 183         case DMA_MODE_WRITE:
 184                 doing_pdma = 2;
 185                 break;
 186         default:
 187                 printk("Unknown dma mode %d\n", mode);
 188                 panic("floppy: Giving up...");
 189         }
 190 }
 191
 192 static void sun_fd_set_dma_addr(char *buffer)
 193 {
 194         pdma_vaddr = buffer;
 195 }
 196
 197 static void sun_fd_set_dma_count(int length)
 198 {
 199         pdma_size = length;
 200 }
 201
 202 static void sun_fd_enable_dma(void)
 203 {
 204         pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
 205         pdma_base = pdma_vaddr;
 206         pdma_areasize = pdma_size;
 207 }
 208
 209 irqreturn_t sparc_floppy_irq(int irq, void *dev_cookie)
 210 {
 211         if (likely(doing_pdma)) {
 212                 void __iomem *stat = (void __iomem *) fdc_status;
 213                 unsigned char *vaddr = pdma_vaddr;
 214                 unsigned long size = pdma_size;
 215                 u8 val;
 216
 217                 while (size) {
 218                         val = readb(stat);
 219                         if (unlikely(!(val & 0x80))) {
 220                                 pdma_vaddr = vaddr;
 221                                 pdma_size = size;
 222                                 return IRQ_HANDLED;
 223                         }
 224                         if (unlikely(!(val & 0x20))) {
 225                                 pdma_vaddr = vaddr;
 226                                 pdma_size = size;
 227                                 doing_pdma = 0;
 228                                 goto main_interrupt;
 229                         }
 230                         if (val & 0x40) {
 231                                 /* read */
 232                                 *vaddr++ = readb(stat + 1);
 233                         } else {
 234                                 unsigned char data = *vaddr++;
 235
 236                                 /* write */
 237                                 writeb(data, stat + 1);
 238                         }
 239                         size--;
 240                 }
 241
 242                 pdma_vaddr = vaddr;
 243                 pdma_size = size;
 244
 245                 /* Send Terminal Count pulse to floppy controller. */
 246                 val = readb(auxio_register);
 247                 val |= AUXIO_AUX1_FTCNT;
 248                 writeb(val, auxio_register);
 249                 val &= ~AUXIO_AUX1_FTCNT;
 250                 writeb(val, auxio_register);
 251
 252                 doing_pdma = 0;
 253         }
 254
 255 main_interrupt:
 256         return floppy_interrupt(irq, dev_cookie);
 257 }
 258
 259 static int sun_fd_request_irq(void)
 260 {
 261         static int once = 0;
 262         int error;
 263
 264         if(!once) {
 265                 once = 1;
 266
 267                 error = request_irq(FLOPPY_IRQ, sparc_floppy_irq,
 268                                     IRQF_DISABLED, "floppy", NULL);
 269
 270                 return ((error == 0) ? 0 : -1);
 271         }
 272         return 0;
 273 }
 274
 275 static void sun_fd_free_irq(void)
 276 {
 277 }
 278
 279 static unsigned int sun_get_dma_residue(void)
 280 {
 281         /* XXX This isn't really correct. XXX */
 282         return 0;
 283 }
 284
 285 static int sun_fd_eject(int drive)
 286 {
 287         set_dor(0x00, 0xff, 0x90);
 288         udelay(500);
 289         set_dor(0x00, 0x6f, 0x00);
 290         udelay(500);
 291         return 0;
 292 }
 293
 294 #ifdef CONFIG_PCI
 295 #include <asm/ebus.h>
 296 #include <asm/isa.h>
 297 #include <asm/ns87303.h>
 298
 299 static struct ebus_dma_info sun_pci_fd_ebus_dma;
 300 static struct pci_dev *sun_pci_ebus_dev;
 301 static int sun_pci_broken_drive = -1;
 302
 303 struct sun_pci_dma_op {
 304         unsigned int    addr;
 305         int             len;
 306         int             direction;
 307         char            *buf;
 308 };
 309 static struct sun_pci_dma_op sun_pci_dma_current = { -1U, 0, 0, NULL};
 310 static struct sun_pci_dma_op sun_pci_dma_pending = { -1U, 0, 0, NULL};
 311
 312 extern irqreturn_t floppy_interrupt(int irq, void *dev_id);
 313
 314 static unsigned char sun_pci_fd_inb(unsigned long port)
 315 {
 316         udelay(5);
 317         return inb(port);
 318 }
 319
 320 static void sun_pci_fd_outb(unsigned char val, unsigned long port)
 321 {
 322         udelay(5);
 323         outb(val, port);
 324 }
 325
 326 static void sun_pci_fd_broken_outb(unsigned char val, unsigned long port)
 327 {
 328         udelay(5);
 329         /*
 330          * XXX: Due to SUN's broken floppy connector on AX and AXi
 331          *      we need to turn on MOTOR_0 also, if the floppy is
 332          *      jumpered to DS1 (like most PC floppies are). I hope
 333          *      this does not hurt correct hardware like the AXmp.
 334          *      (Eddie, Sep 12 1998).
 335          */
 336         if (port == ((unsigned long)sun_fdc) + 2) {
 337                 if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x20)) {
 338                         val |= 0x10;
 339                 }
 340         }
 341         outb(val, port);
 342 }
 343
 344 #ifdef PCI_FDC_SWAP_DRIVES
 345 static void sun_pci_fd_lde_broken_outb(unsigned char val, unsigned long port)
 346 {
 347         udelay(5);
 348         /*
 349          * XXX: Due to SUN's broken floppy connector on AX and AXi
 350          *      we need to turn on MOTOR_0 also, if the floppy is
 351          *      jumpered to DS1 (like most PC floppies are). I hope
 352          *      this does not hurt correct hardware like the AXmp.
 353          *      (Eddie, Sep 12 1998).
 354          */
 355         if (port == ((unsigned long)sun_fdc) + 2) {
 356                 if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x10)) {
 357                         val &= ~(0x03);
 358                         val |= 0x21;
 359                 }
 360         }
 361         outb(val, port);
 362 }
 363 #endif /* PCI_FDC_SWAP_DRIVES */
 364
 365 static void sun_pci_fd_enable_dma(void)
 366 {
 367         BUG_ON((NULL == sun_pci_dma_pending.buf)        ||
 368             (0    == sun_pci_dma_pending.len)   ||
 369             (0    == sun_pci_dma_pending.direction));
 370
 371         sun_pci_dma_current.buf = sun_pci_dma_pending.buf;
 372         sun_pci_dma_current.len = sun_pci_dma_pending.len;
 373         sun_pci_dma_current.direction = sun_pci_dma_pending.direction;
 374
 375         sun_pci_dma_pending.buf  = NULL;
 376         sun_pci_dma_pending.len  = 0;
 377         sun_pci_dma_pending.direction = 0;
 378         sun_pci_dma_pending.addr = -1U;
 379
 380         sun_pci_dma_current.addr =
 381                 pci_map_single(sun_pci_ebus_dev,
 382                                sun_pci_dma_current.buf,
 383                                sun_pci_dma_current.len,
 384                                sun_pci_dma_current.direction);
 385
 386         ebus_dma_enable(&sun_pci_fd_ebus_dma, 1);
 387
 388         if (ebus_dma_request(&sun_pci_fd_ebus_dma,
 389                              sun_pci_dma_current.addr,
 390                              sun_pci_dma_current.len))
 391                 BUG();
 392 }
 393
 394 static void sun_pci_fd_disable_dma(void)
 395 {
 396         ebus_dma_enable(&sun_pci_fd_ebus_dma, 0);
 397         if (sun_pci_dma_current.addr != -1U)
 398                 pci_unmap_single(sun_pci_ebus_dev,
 399                                  sun_pci_dma_current.addr,
 400                                  sun_pci_dma_current.len,
 401                                  sun_pci_dma_current.direction);
 402         sun_pci_dma_current.addr = -1U;
 403 }
 404
 405 static void sun_pci_fd_set_dma_mode(int mode)
 406 {
 407         if (mode == DMA_MODE_WRITE)
 408                 sun_pci_dma_pending.direction = PCI_DMA_TODEVICE;
 409         else
 410                 sun_pci_dma_pending.direction = PCI_DMA_FROMDEVICE;
 411
 412         ebus_dma_prepare(&sun_pci_fd_ebus_dma, mode != DMA_MODE_WRITE);
 413 }
 414
 415 static void sun_pci_fd_set_dma_count(int length)
 416 {
 417         sun_pci_dma_pending.len = length;
 418 }
 419
 420 static void sun_pci_fd_set_dma_addr(char *buffer)
 421 {
 422         sun_pci_dma_pending.buf = buffer;
 423 }
 424
 425 static unsigned int sun_pci_get_dma_residue(void)
 426 {
 427         return ebus_dma_residue(&sun_pci_fd_ebus_dma);
 428 }
 429
 430 static int sun_pci_fd_request_irq(void)
 431 {
 432         return ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 1);
 433 }
 434
 435 static void sun_pci_fd_free_irq(void)
 436 {
 437         ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 0);
 438 }
 439
 440 static int sun_pci_fd_eject(int drive)
 441 {
 442         return -EINVAL;
 443 }
 444
 445 void sun_pci_fd_dma_callback(struct ebus_dma_info *p, int event, void *cookie)
 446 {
 447         floppy_interrupt(0, NULL);
 448 }
 449
 450 /*
 451  * Floppy probing, we'd like to use /dev/fd0 for a single Floppy on PCI,
 452  * even if this is configured using DS1, thus looks like /dev/fd1 with
 453  * the cabling used in Ultras.
 454  */
 455 #define DOR     (port + 2)
 456 #define MSR     (port + 4)
 457 #define FIFO    (port + 5)
 458
 459 static void sun_pci_fd_out_byte(unsigned long port, unsigned char val,
 460                                 unsigned long reg)
 461 {
 462         unsigned char status;
 463         int timeout = 1000;
 464
 465         while (!((status = inb(MSR)) & 0x80) && --timeout)
 466                 udelay(100);
 467         outb(val, reg);
 468 }
 469
 470 static unsigned char sun_pci_fd_sensei(unsigned long port)
 471 {
 472         unsigned char result[2] = { 0x70, 0x00 };
 473         unsigned char status;
 474         int i = 0;
 475
 476         sun_pci_fd_out_byte(port, 0x08, FIFO);
 477         do {
 478                 int timeout = 1000;
 479
 480                 while (!((status = inb(MSR)) & 0x80) && --timeout)
 481                         udelay(100);
 482
 483                 if (!timeout)
 484                         break;
 485
 486                 if ((status & 0xf0) == 0xd0)
 487                         result[i++] = inb(FIFO);
 488                 else
 489                         break;
 490         } while (i < 2);
 491
 492         return result[0];
 493 }
 494
 495 static void sun_pci_fd_reset(unsigned long port)
 496 {
 497         unsigned char mask = 0x00;
 498         unsigned char status;
 499         int timeout = 10000;
 500
 501         outb(0x80, MSR);
 502         do {
 503                 status = sun_pci_fd_sensei(port);
 504                 if ((status & 0xc0) == 0xc0)
 505                         mask |= 1 << (status & 0x03);
 506                 else
 507                         udelay(100);
 508         } while ((mask != 0x0f) && --timeout);
 509 }
 510
 511 static int sun_pci_fd_test_drive(unsigned long port, int drive)
 512 {
 513         unsigned char status, data;
 514         int timeout = 1000;
 515         int ready;
 516
 517         sun_pci_fd_reset(port);
 518
 519         data = (0x10 << drive) | 0x0c | drive;
 520         sun_pci_fd_out_byte(port, data, DOR);
 521
 522         sun_pci_fd_out_byte(port, 0x07, FIFO);
 523         sun_pci_fd_out_byte(port, drive & 0x03, FIFO);
 524
 525         do {
 526                 udelay(100);
 527                 status = sun_pci_fd_sensei(port);
 528         } while (((status & 0xc0) == 0x80) && --timeout);
 529
 530         if (!timeout)
 531                 ready = 0;
 532         else
 533                 ready = (status & 0x10) ? 0 : 1;
 534
 535         sun_pci_fd_reset(port);
 536         return ready;
 537 }
 538 #undef FIFO
 539 #undef MSR
 540 #undef DOR
 541
 542 #endif /* CONFIG_PCI */
 543
 544 #ifdef CONFIG_PCI
 545 static int __init ebus_fdthree_p(struct linux_ebus_device *edev)
 546 {
 547         if (!strcmp(edev->prom_node->name, "fdthree"))
 548                 return 1;
 549         if (!strcmp(edev->prom_node->name, "floppy")) {
 550                 const char *compat;
 551
 552                 compat = of_get_property(edev->prom_node,
 553                                          "compatible", NULL);
 554                 if (compat && !strcmp(compat, "fdthree"))
 555                         return 1;
 556         }
 557         return 0;
 558 }
 559 #endif
 560
 561 #ifdef CONFIG_PCI
 562 #undef ISA_FLOPPY_WORKS
 563
 564 #ifdef ISA_FLOPPY_WORKS
 565 static unsigned long __init isa_floppy_init(void)
 566 {
 567         struct sparc_isa_bridge *isa_br;
 568         struct sparc_isa_device *isa_dev = NULL;
 569
 570         for_each_isa(isa_br) {
 571                 for_each_isadev(isa_dev, isa_br) {
 572                         if (!strcmp(isa_dev->prom_node->name, "dma")) {
 573                                 struct sparc_isa_device *child =
 574                                         isa_dev->child;
 575
 576                                 while (child) {
 577                                         if (!strcmp(child->prom_node->name,
 578                                                     "floppy")) {
 579                                                 isa_dev = child;
 580                                                 goto isa_done;
 581                                         }
 582                                         child = child->next;
 583                                 }
 584                         }
 585                 }
 586         }
 587 isa_done:
 588         if (!isa_dev)
 589                 return 0;
 590
 591         /* We could use DMA on devices behind the ISA bridge, but...
 592          *
 593          * There is a slight problem.  Normally on x86 kit the x86 processor
 594          * delays I/O port instructions when the ISA bus "dma in progress"
 595          * signal is active.  Well, sparc64 systems do not monitor this
 596          * signal thus we would need to block all I/O port accesses in software
 597          * when a dma transfer is active for some device.
 598          */
 599
 600         sun_fdc = (struct sun_flpy_controller *)isa_dev->resource.start;
 601         FLOPPY_IRQ = isa_dev->irq;
 602
 603         sun_fdops.fd_inb = sun_pci_fd_inb;
 604         sun_fdops.fd_outb = sun_pci_fd_outb;
 605
 606         can_use_virtual_dma = use_virtual_dma = 1;
 607         sun_fdops.fd_enable_dma = sun_fd_enable_dma;
 608         sun_fdops.fd_disable_dma = sun_fd_disable_dma;
 609         sun_fdops.fd_set_dma_mode = sun_fd_set_dma_mode;
 610         sun_fdops.fd_set_dma_addr = sun_fd_set_dma_addr;
 611         sun_fdops.fd_set_dma_count = sun_fd_set_dma_count;
 612         sun_fdops.get_dma_residue = sun_get_dma_residue;
 613
 614         sun_fdops.fd_request_irq = sun_fd_request_irq;
 615         sun_fdops.fd_free_irq = sun_fd_free_irq;
 616
 617         /* Floppy eject is manual.   Actually, could determine this
 618          * via presence of 'manual' property in OBP node.
 619          */
 620         sun_fdops.fd_eject = sun_pci_fd_eject;
 621
 622         fdc_status = (unsigned long) &sun_fdc->status_82077;
 623
 624         allowed_drive_mask = 0;
 625         sun_floppy_types[0] = 0;
 626         sun_floppy_types[1] = 4;
 627
 628         sun_pci_broken_drive = 1;
 629         sun_fdops.fd_outb = sun_pci_fd_broken_outb;
 630
 631         return sun_floppy_types[0];
 632 }
 633 #endif /* ISA_FLOPPY_WORKS */
 634
 635 #endif
 636
 637 static unsigned long __init sun_floppy_init(void)
 638 {
 639         char state[128];
 640         struct sbus_bus *bus;
 641         struct sbus_dev *sdev = NULL;
 642         static int initialized = 0;
 643
 644         if (initialized)
 645                 return sun_floppy_types[0];
 646         initialized = 1;
 647
 648         for_all_sbusdev (sdev, bus) {
 649                 if (!strcmp(sdev->prom_name, "SUNW,fdtwo"))
 650                         break;
 651         }
 652         if(sdev) {
 653                 floppy_sdev = sdev;
 654                 FLOPPY_IRQ = sdev->irqs[0];
 655         } else {
 656 #ifdef CONFIG_PCI
 657                 struct linux_ebus *ebus;
 658                 struct linux_ebus_device *edev = NULL;
 659                 unsigned long config = 0;
 660                 void __iomem *auxio_reg;
 661                 const char *state_prop;
 662
 663                 for_each_ebus(ebus) {
 664                         for_each_ebusdev(edev, ebus) {
 665                                 if (ebus_fdthree_p(edev))
 666                                         goto ebus_done;
 667                         }
 668                 }
 669         ebus_done:
 670                 if (!edev) {
 671 #ifdef ISA_FLOPPY_WORKS
 672                         return isa_floppy_init();
 673 #else
 674                         return 0;
 675 #endif
 676                 }
 677
 678                 state_prop = of_get_property(edev->prom_node, "status", NULL);
 679                 if (state_prop && !strncmp(state_prop, "disabled", 8))
 680                         return 0;
 681
 682                 FLOPPY_IRQ = edev->irqs[0];
 683
 684                 /* Make sure the high density bit is set, some systems
 685                  * (most notably Ultra5/Ultra10) come up with it clear.
 686                  */
 687                 auxio_reg = (void __iomem *) edev->resource[2].start;
 688                 writel(readl(auxio_reg)|0x2, auxio_reg);
 689
 690                 sun_pci_ebus_dev = ebus->self;
 691
 692                 spin_lock_init(&sun_pci_fd_ebus_dma.lock);
 693
 694                 /* XXX ioremap */
 695                 sun_pci_fd_ebus_dma.regs = (void __iomem *)
 696                         edev->resource[1].start;
 697                 if (!sun_pci_fd_ebus_dma.regs)
 698                         return 0;
 699
 700                 sun_pci_fd_ebus_dma.flags = (EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
 701                                              EBUS_DMA_FLAG_TCI_DISABLE);
 702                 sun_pci_fd_ebus_dma.callback = sun_pci_fd_dma_callback;
 703                 sun_pci_fd_ebus_dma.client_cookie = NULL;
 704                 sun_pci_fd_ebus_dma.irq = FLOPPY_IRQ;
 705                 strcpy(sun_pci_fd_ebus_dma.name, "floppy");
 706                 if (ebus_dma_register(&sun_pci_fd_ebus_dma))
 707                         return 0;
 708
 709                 /* XXX ioremap */
 710                 sun_fdc = (struct sun_flpy_controller *)edev->resource[0].start;
 711
 712                 sun_fdops.fd_inb = sun_pci_fd_inb;
 713                 sun_fdops.fd_outb = sun_pci_fd_outb;
 714
 715                 can_use_virtual_dma = use_virtual_dma = 0;
 716                 sun_fdops.fd_enable_dma = sun_pci_fd_enable_dma;
 717                 sun_fdops.fd_disable_dma = sun_pci_fd_disable_dma;
 718                 sun_fdops.fd_set_dma_mode = sun_pci_fd_set_dma_mode;
 719                 sun_fdops.fd_set_dma_addr = sun_pci_fd_set_dma_addr;
 720                 sun_fdops.fd_set_dma_count = sun_pci_fd_set_dma_count;
 721                 sun_fdops.get_dma_residue = sun_pci_get_dma_residue;
 722
 723                 sun_fdops.fd_request_irq = sun_pci_fd_request_irq;
 724                 sun_fdops.fd_free_irq = sun_pci_fd_free_irq;
 725
 726                 sun_fdops.fd_eject = sun_pci_fd_eject;
 727
 728                 fdc_status = (unsigned long) &sun_fdc->status_82077;
 729
 730                 /*
 731                  * XXX: Find out on which machines this is really needed.
 732                  */
 733                 if (1) {
 734                         sun_pci_broken_drive = 1;
 735                         sun_fdops.fd_outb = sun_pci_fd_broken_outb;
 736                 }
 737
 738                 allowed_drive_mask = 0;
 739                 if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 0))
 740                         sun_floppy_types[0] = 4;
 741                 if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 1))
 742                         sun_floppy_types[1] = 4;
 743
 744                 /*
 745                  * Find NS87303 SuperIO config registers (through ecpp).
 746                  */
 747                 for_each_ebus(ebus) {
 748                         for_each_ebusdev(edev, ebus) {
 749                                 if (!strcmp(edev->prom_node->name, "ecpp")) {
 750                                         config = edev->resource[1].start;
 751                                         goto config_done;
 752                                 }
 753                         }
 754                 }
 755         config_done:
 756
 757                 /*
 758                  * Sanity check, is this really the NS87303?
 759                  */
 760                 switch (config & 0x3ff) {
 761                 case 0x02e:
 762                 case 0x15c:
 763                 case 0x26e:
 764                 case 0x398:
 765                         break;
 766                 default:
 767                         config = 0;
 768                 }
 769
 770                 if (!config)
 771                         return sun_floppy_types[0];
 772
 773                 /* Enable PC-AT mode. */
 774                 ns87303_modify(config, ASC, 0, 0xc0);
 775
 776 #ifdef PCI_FDC_SWAP_DRIVES
 777                 /*
 778                  * If only Floppy 1 is present, swap drives.
 779                  */
 780                 if (!sun_floppy_types[0] && sun_floppy_types[1]) {
 781                         /*
 782                          * Set the drive exchange bit in FCR on NS87303,
 783                          * make sure other bits are sane before doing so.
 784                          */
 785                         ns87303_modify(config, FER, FER_EDM, 0);
 786                         ns87303_modify(config, ASC, ASC_DRV2_SEL, 0);
 787                         ns87303_modify(config, FCR, 0, FCR_LDE);
 788
 789                         config = sun_floppy_types[0];
 790                         sun_floppy_types[0] = sun_floppy_types[1];
 791                         sun_floppy_types[1] = config;
 792
 793                         if (sun_pci_broken_drive != -1) {
 794                                 sun_pci_broken_drive = 1 - sun_pci_broken_drive;
 795                                 sun_fdops.fd_outb = sun_pci_fd_lde_broken_outb;
 796                         }
 797                 }
 798 #endif /* PCI_FDC_SWAP_DRIVES */
 799
 800                 return sun_floppy_types[0];
 801 #else
 802                 return 0;
 803 #endif
 804         }
 805         prom_getproperty(sdev->prom_node, "status", state, sizeof(state));
 806         if(!strncmp(state, "disabled", 8))
 807                 return 0;
 808
 809         /*
 810          * We cannot do sbus_ioremap here: it does request_region,
 811          * which the generic floppy driver tries to do once again.
 812          * But we must use the sdev resource values as they have
 813          * had parent ranges applied.
 814          */
 815         sun_fdc = (struct sun_flpy_controller *)
 816                 (sdev->resource[0].start +
 817                  ((sdev->resource[0].flags & 0x1ffUL) << 32UL));
 818
 819         /* Last minute sanity check... */
 820         if(sbus_readb(&sun_fdc->status1_82077) == 0xff) {
 821                 sun_fdc = (struct sun_flpy_controller *)-1;
 822                 return 0;
 823         }
 824
 825         sun_fdops.fd_inb = sun_82077_fd_inb;
 826         sun_fdops.fd_outb = sun_82077_fd_outb;
 827
 828         can_use_virtual_dma = use_virtual_dma = 1;
 829         sun_fdops.fd_enable_dma = sun_fd_enable_dma;
 830         sun_fdops.fd_disable_dma = sun_fd_disable_dma;
 831         sun_fdops.fd_set_dma_mode = sun_fd_set_dma_mode;
 832         sun_fdops.fd_set_dma_addr = sun_fd_set_dma_addr;
 833         sun_fdops.fd_set_dma_count = sun_fd_set_dma_count;
 834         sun_fdops.get_dma_residue = sun_get_dma_residue;
 835
 836         sun_fdops.fd_request_irq = sun_fd_request_irq;
 837         sun_fdops.fd_free_irq = sun_fd_free_irq;
 838
 839         sun_fdops.fd_eject = sun_fd_eject;
 840
 841         fdc_status = (unsigned long) &sun_fdc->status_82077;
 842
 843         /* Success... */
 844         allowed_drive_mask = 0x01;
 845         sun_floppy_types[0] = 4;
 846         sun_floppy_types[1] = 0;
 847
 848         return sun_floppy_types[0];
 849 }
 850
 851 #define EXTRA_FLOPPY_PARAMS
 852
 853 static DEFINE_SPINLOCK(dma_spin_lock);
 854
 855 #define claim_dma_lock() \
 856 ({      unsigned long flags; \
 857         spin_lock_irqsave(&dma_spin_lock, flags); \
 858         flags; \
 859 })
 860
 861 #define release_dma_lock(__flags) \
 862         spin_unlock_irqrestore(&dma_spin_lock, __flags);
 863
 864 #endif /* !(__ASM_SPARC64_FLOPPY_H) */