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   1 /* floppy.h: Sparc specific parts of the Floppy driver.
   2  *
   3  * Copyright (C) 1996, 2007, 2008 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 #include <linux/of.h>
  15 #include <linux/of_device.h>
  16
  17 #include <asm/page.h>
  18 #include <asm/pgtable.h>
  19 #include <asm/system.h>
  20 #include <asm/idprom.h>
  21 #include <asm/oplib.h>
  22 #include <asm/auxio.h>
  23 #include <asm/irq.h>
  24
  25
  26 /*
  27  * Define this to enable exchanging drive 0 and 1 if only drive 1 is
  28  * probed on PCI machines.
  29  */
  30 #undef PCI_FDC_SWAP_DRIVES
  31
  32
  33 /* References:
  34  * 1) Netbsd Sun floppy driver.
  35  * 2) NCR 82077 controller manual
  36  * 3) Intel 82077 controller manual
  37  */
  38 struct sun_flpy_controller {
  39         volatile unsigned char status1_82077; /* Auxiliary Status reg. 1 */
  40         volatile unsigned char status2_82077; /* Auxiliary Status reg. 2 */
  41         volatile unsigned char dor_82077;     /* Digital Output reg. */
  42         volatile unsigned char tapectl_82077; /* Tape Control reg */
  43         volatile unsigned char status_82077;  /* Main Status Register. */
  44 #define drs_82077              status_82077   /* Digital Rate Select reg. */
  45         volatile unsigned char data_82077;    /* Data fifo. */
  46         volatile unsigned char ___unused;
  47         volatile unsigned char dir_82077;     /* Digital Input reg. */
  48 #define dcr_82077              dir_82077      /* Config Control reg. */
  49 };
  50
  51 /* You'll only ever find one controller on an Ultra anyways. */
  52 static struct sun_flpy_controller *sun_fdc = (struct sun_flpy_controller *)-1;
  53 unsigned long fdc_status;
  54 static struct of_device *floppy_op = NULL;
  55
  56 struct sun_floppy_ops {
  57         unsigned char   (*fd_inb) (unsigned long port);
  58         void            (*fd_outb) (unsigned char value, unsigned long port);
  59         void            (*fd_enable_dma) (void);
  60         void            (*fd_disable_dma) (void);
  61         void            (*fd_set_dma_mode) (int);
  62         void            (*fd_set_dma_addr) (char *);
  63         void            (*fd_set_dma_count) (int);
  64         unsigned int    (*get_dma_residue) (void);
  65         int             (*fd_request_irq) (void);
  66         void            (*fd_free_irq) (void);
  67         int             (*fd_eject) (int);
  68 };
  69
  70 static struct sun_floppy_ops sun_fdops;
  71
  72 #define fd_inb(port)              sun_fdops.fd_inb(port)
  73 #define fd_outb(value,port)       sun_fdops.fd_outb(value,port)
  74 #define fd_enable_dma()           sun_fdops.fd_enable_dma()
  75 #define fd_disable_dma()          sun_fdops.fd_disable_dma()
  76 #define fd_request_dma()          (0) /* nothing... */
  77 #define fd_free_dma()             /* nothing... */
  78 #define fd_clear_dma_ff()         /* nothing... */
  79 #define fd_set_dma_mode(mode)     sun_fdops.fd_set_dma_mode(mode)
  80 #define fd_set_dma_addr(addr)     sun_fdops.fd_set_dma_addr(addr)
  81 #define fd_set_dma_count(count)   sun_fdops.fd_set_dma_count(count)
  82 #define get_dma_residue(x)        sun_fdops.get_dma_residue()
  83 #define fd_cacheflush(addr, size) /* nothing... */
  84 #define fd_request_irq()          sun_fdops.fd_request_irq()
  85 #define fd_free_irq()             sun_fdops.fd_free_irq()
  86 #define fd_eject(drive)           sun_fdops.fd_eject(drive)
  87
  88 /* Super paranoid... */
  89 #undef HAVE_DISABLE_HLT
  90
  91 static int sun_floppy_types[2] = { 0, 0 };
  92
  93 /* Here is where we catch the floppy driver trying to initialize,
  94  * therefore this is where we call the PROM device tree probing
  95  * routine etc. on the Sparc.
  96  */
  97 #define FLOPPY0_TYPE            sun_floppy_init()
  98 #define FLOPPY1_TYPE            sun_floppy_types[1]
  99
 100 #define FDC1                    ((unsigned long)sun_fdc)
 101
 102 #define N_FDC    1
 103 #define N_DRIVE  8
 104
 105 /* No 64k boundary crossing problems on the Sparc. */
 106 #define CROSS_64KB(a,s) (0)
 107
 108 static unsigned char sun_82077_fd_inb(unsigned long port)
 109 {
 110         udelay(5);
 111         switch(port & 7) {
 112         default:
 113                 printk("floppy: Asked to read unknown port %lx\n", port);
 114                 panic("floppy: Port bolixed.");
 115         case 4: /* FD_STATUS */
 116                 return sbus_readb(&sun_fdc->status_82077) & ~STATUS_DMA;
 117         case 5: /* FD_DATA */
 118                 return sbus_readb(&sun_fdc->data_82077);
 119         case 7: /* FD_DIR */
 120                 /* XXX: Is DCL on 0x80 in sun4m? */
 121                 return sbus_readb(&sun_fdc->dir_82077);
 122         };
 123         panic("sun_82072_fd_inb: How did I get here?");
 124 }
 125
 126 static void sun_82077_fd_outb(unsigned char value, unsigned long port)
 127 {
 128         udelay(5);
 129         switch(port & 7) {
 130         default:
 131                 printk("floppy: Asked to write to unknown port %lx\n", port);
 132                 panic("floppy: Port bolixed.");
 133         case 2: /* FD_DOR */
 134                 /* Happily, the 82077 has a real DOR register. */
 135                 sbus_writeb(value, &sun_fdc->dor_82077);
 136                 break;
 137         case 5: /* FD_DATA */
 138                 sbus_writeb(value, &sun_fdc->data_82077);
 139                 break;
 140         case 7: /* FD_DCR */
 141                 sbus_writeb(value, &sun_fdc->dcr_82077);
 142                 break;
 143         case 4: /* FD_STATUS */
 144                 sbus_writeb(value, &sun_fdc->status_82077);
 145                 break;
 146         };
 147         return;
 148 }
 149
 150 /* For pseudo-dma (Sun floppy drives have no real DMA available to
 151  * them so we must eat the data fifo bytes directly ourselves) we have
 152  * three state variables.  doing_pdma tells our inline low-level
 153  * assembly floppy interrupt entry point whether it should sit and eat
 154  * bytes from the fifo or just transfer control up to the higher level
 155  * floppy interrupt c-code.  I tried very hard but I could not get the
 156  * pseudo-dma to work in c-code without getting many overruns and
 157  * underruns.  If non-zero, doing_pdma encodes the direction of
 158  * the transfer for debugging.  1=read 2=write
 159  */
 160 unsigned char *pdma_vaddr;
 161 unsigned long pdma_size;
 162 volatile int doing_pdma = 0;
 163
 164 /* This is software state */
 165 char *pdma_base = NULL;
 166 unsigned long pdma_areasize;
 167
 168 /* Common routines to all controller types on the Sparc. */
 169 static void sun_fd_disable_dma(void)
 170 {
 171         doing_pdma = 0;
 172         if (pdma_base) {
 173                 mmu_unlockarea(pdma_base, pdma_areasize);
 174                 pdma_base = NULL;
 175         }
 176 }
 177
 178 static void sun_fd_set_dma_mode(int mode)
 179 {
 180         switch(mode) {
 181         case DMA_MODE_READ:
 182                 doing_pdma = 1;
 183                 break;
 184         case DMA_MODE_WRITE:
 185                 doing_pdma = 2;
 186                 break;
 187         default:
 188                 printk("Unknown dma mode %d\n", mode);
 189                 panic("floppy: Giving up...");
 190         }
 191 }
 192
 193 static void sun_fd_set_dma_addr(char *buffer)
 194 {
 195         pdma_vaddr = buffer;
 196 }
 197
 198 static void sun_fd_set_dma_count(int length)
 199 {
 200         pdma_size = length;
 201 }
 202
 203 static void sun_fd_enable_dma(void)
 204 {
 205         pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
 206         pdma_base = pdma_vaddr;
 207         pdma_areasize = pdma_size;
 208 }
 209
 210 irqreturn_t sparc_floppy_irq(int irq, void *dev_cookie)
 211 {
 212         if (likely(doing_pdma)) {
 213                 void __iomem *stat = (void __iomem *) fdc_status;
 214                 unsigned char *vaddr = pdma_vaddr;
 215                 unsigned long size = pdma_size;
 216                 u8 val;
 217
 218                 while (size) {
 219                         val = readb(stat);
 220                         if (unlikely(!(val & 0x80))) {
 221                                 pdma_vaddr = vaddr;
 222                                 pdma_size = size;
 223                                 return IRQ_HANDLED;
 224                         }
 225                         if (unlikely(!(val & 0x20))) {
 226                                 pdma_vaddr = vaddr;
 227                                 pdma_size = size;
 228                                 doing_pdma = 0;
 229                                 goto main_interrupt;
 230                         }
 231                         if (val & 0x40) {
 232                                 /* read */
 233                                 *vaddr++ = readb(stat + 1);
 234                         } else {
 235                                 unsigned char data = *vaddr++;
 236
 237                                 /* write */
 238                                 writeb(data, stat + 1);
 239                         }
 240                         size--;
 241                 }
 242
 243                 pdma_vaddr = vaddr;
 244                 pdma_size = size;
 245
 246                 /* Send Terminal Count pulse to floppy controller. */
 247                 val = readb(auxio_register);
 248                 val |= AUXIO_AUX1_FTCNT;
 249                 writeb(val, auxio_register);
 250                 val &= ~AUXIO_AUX1_FTCNT;
 251                 writeb(val, auxio_register);
 252
 253                 doing_pdma = 0;
 254         }
 255
 256 main_interrupt:
 257         return floppy_interrupt(irq, dev_cookie);
 258 }
 259
 260 static int sun_fd_request_irq(void)
 261 {
 262         static int once = 0;
 263         int error;
 264
 265         if(!once) {
 266                 once = 1;
 267
 268                 error = request_irq(FLOPPY_IRQ, sparc_floppy_irq,
 269                                     IRQF_DISABLED, "floppy", NULL);
 270
 271                 return ((error == 0) ? 0 : -1);
 272         }
 273         return 0;
 274 }
 275
 276 static void sun_fd_free_irq(void)
 277 {
 278 }
 279
 280 static unsigned int sun_get_dma_residue(void)
 281 {
 282         /* XXX This isn't really correct. XXX */
 283         return 0;
 284 }
 285
 286 static int sun_fd_eject(int drive)
 287 {
 288         set_dor(0x00, 0xff, 0x90);
 289         udelay(500);
 290         set_dor(0x00, 0x6f, 0x00);
 291         udelay(500);
 292         return 0;
 293 }
 294
 295 #ifdef CONFIG_PCI
 296 #include <asm/ebus.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 static unsigned long __init sun_floppy_init(void)
 562 {
 563         static int initialized = 0;
 564         struct device_node *dp;
 565         struct of_device *op;
 566         const char *prop;
 567         char state[128];
 568
 569         if (initialized)
 570                 return sun_floppy_types[0];
 571         initialized = 1;
 572
 573         op = NULL;
 574
 575         for_each_node_by_name(dp, "SUNW,fdtwo") {
 576                 if (strcmp(dp->parent->name, "sbus"))
 577                         continue;
 578                 op = of_find_device_by_node(dp);
 579                 if (op)
 580                         break;
 581         }
 582         if (op) {
 583                 floppy_op = op;
 584                 FLOPPY_IRQ = op->irqs[0];
 585         } else {
 586 #ifdef CONFIG_PCI
 587                 struct linux_ebus *ebus;
 588                 struct linux_ebus_device *edev = NULL;
 589                 unsigned long config = 0;
 590                 void __iomem *auxio_reg;
 591                 const char *state_prop;
 592
 593                 for_each_ebus(ebus) {
 594                         for_each_ebusdev(edev, ebus) {
 595                                 if (ebus_fdthree_p(edev))
 596                                         goto ebus_done;
 597                         }
 598                 }
 599         ebus_done:
 600                 if (!edev)
 601                         return 0;
 602
 603                 op = &edev->ofdev;
 604
 605                 state_prop = of_get_property(op->node, "status", NULL);
 606                 if (state_prop && !strncmp(state_prop, "disabled", 8))
 607                         return 0;
 608
 609                 FLOPPY_IRQ = edev->irqs[0];
 610
 611                 /* Make sure the high density bit is set, some systems
 612                  * (most notably Ultra5/Ultra10) come up with it clear.
 613                  */
 614                 auxio_reg = (void __iomem *) edev->resource[2].start;
 615                 writel(readl(auxio_reg)|0x2, auxio_reg);
 616
 617                 sun_pci_ebus_dev = ebus->self;
 618
 619                 spin_lock_init(&sun_pci_fd_ebus_dma.lock);
 620
 621                 /* XXX ioremap */
 622                 sun_pci_fd_ebus_dma.regs = (void __iomem *)
 623                         edev->resource[1].start;
 624                 if (!sun_pci_fd_ebus_dma.regs)
 625                         return 0;
 626
 627                 sun_pci_fd_ebus_dma.flags = (EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
 628                                              EBUS_DMA_FLAG_TCI_DISABLE);
 629                 sun_pci_fd_ebus_dma.callback = sun_pci_fd_dma_callback;
 630                 sun_pci_fd_ebus_dma.client_cookie = NULL;
 631                 sun_pci_fd_ebus_dma.irq = FLOPPY_IRQ;
 632                 strcpy(sun_pci_fd_ebus_dma.name, "floppy");
 633                 if (ebus_dma_register(&sun_pci_fd_ebus_dma))
 634                         return 0;
 635
 636                 /* XXX ioremap */
 637                 sun_fdc = (struct sun_flpy_controller *)edev->resource[0].start;
 638
 639                 sun_fdops.fd_inb = sun_pci_fd_inb;
 640                 sun_fdops.fd_outb = sun_pci_fd_outb;
 641
 642                 can_use_virtual_dma = use_virtual_dma = 0;
 643                 sun_fdops.fd_enable_dma = sun_pci_fd_enable_dma;
 644                 sun_fdops.fd_disable_dma = sun_pci_fd_disable_dma;
 645                 sun_fdops.fd_set_dma_mode = sun_pci_fd_set_dma_mode;
 646                 sun_fdops.fd_set_dma_addr = sun_pci_fd_set_dma_addr;
 647                 sun_fdops.fd_set_dma_count = sun_pci_fd_set_dma_count;
 648                 sun_fdops.get_dma_residue = sun_pci_get_dma_residue;
 649
 650                 sun_fdops.fd_request_irq = sun_pci_fd_request_irq;
 651                 sun_fdops.fd_free_irq = sun_pci_fd_free_irq;
 652
 653                 sun_fdops.fd_eject = sun_pci_fd_eject;
 654
 655                 fdc_status = (unsigned long) &sun_fdc->status_82077;
 656
 657                 /*
 658                  * XXX: Find out on which machines this is really needed.
 659                  */
 660                 if (1) {
 661                         sun_pci_broken_drive = 1;
 662                         sun_fdops.fd_outb = sun_pci_fd_broken_outb;
 663                 }
 664
 665                 allowed_drive_mask = 0;
 666                 if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 0))
 667                         sun_floppy_types[0] = 4;
 668                 if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 1))
 669                         sun_floppy_types[1] = 4;
 670
 671                 /*
 672                  * Find NS87303 SuperIO config registers (through ecpp).
 673                  */
 674                 for_each_ebus(ebus) {
 675                         for_each_ebusdev(edev, ebus) {
 676                                 if (!strcmp(edev->prom_node->name, "ecpp")) {
 677                                         config = edev->resource[1].start;
 678                                         goto config_done;
 679                                 }
 680                         }
 681                 }
 682         config_done:
 683
 684                 /*
 685                  * Sanity check, is this really the NS87303?
 686                  */
 687                 switch (config & 0x3ff) {
 688                 case 0x02e:
 689                 case 0x15c:
 690                 case 0x26e:
 691                 case 0x398:
 692                         break;
 693                 default:
 694                         config = 0;
 695                 }
 696
 697                 if (!config)
 698                         return sun_floppy_types[0];
 699
 700                 /* Enable PC-AT mode. */
 701                 ns87303_modify(config, ASC, 0, 0xc0);
 702
 703 #ifdef PCI_FDC_SWAP_DRIVES
 704                 /*
 705                  * If only Floppy 1 is present, swap drives.
 706                  */
 707                 if (!sun_floppy_types[0] && sun_floppy_types[1]) {
 708                         /*
 709                          * Set the drive exchange bit in FCR on NS87303,
 710                          * make sure other bits are sane before doing so.
 711                          */
 712                         ns87303_modify(config, FER, FER_EDM, 0);
 713                         ns87303_modify(config, ASC, ASC_DRV2_SEL, 0);
 714                         ns87303_modify(config, FCR, 0, FCR_LDE);
 715
 716                         config = sun_floppy_types[0];
 717                         sun_floppy_types[0] = sun_floppy_types[1];
 718                         sun_floppy_types[1] = config;
 719
 720                         if (sun_pci_broken_drive != -1) {
 721                                 sun_pci_broken_drive = 1 - sun_pci_broken_drive;
 722                                 sun_fdops.fd_outb = sun_pci_fd_lde_broken_outb;
 723                         }
 724                 }
 725 #endif /* PCI_FDC_SWAP_DRIVES */
 726
 727                 return sun_floppy_types[0];
 728 #else
 729                 return 0;
 730 #endif
 731         }
 732         prop = of_get_property(op->node, "status", NULL);
 733         if (prop && !strncmp(state, "disabled", 8))
 734                 return 0;
 735
 736         /*
 737          * We cannot do of_ioremap here: it does request_region,
 738          * which the generic floppy driver tries to do once again.
 739          * But we must use the sdev resource values as they have
 740          * had parent ranges applied.
 741          */
 742         sun_fdc = (struct sun_flpy_controller *)
 743                 (op->resource[0].start +
 744                  ((op->resource[0].flags & 0x1ffUL) << 32UL));
 745
 746         /* Last minute sanity check... */
 747         if (sbus_readb(&sun_fdc->status1_82077) == 0xff) {
 748                 sun_fdc = (struct sun_flpy_controller *)-1;
 749                 return 0;
 750         }
 751
 752         sun_fdops.fd_inb = sun_82077_fd_inb;
 753         sun_fdops.fd_outb = sun_82077_fd_outb;
 754
 755         can_use_virtual_dma = use_virtual_dma = 1;
 756         sun_fdops.fd_enable_dma = sun_fd_enable_dma;
 757         sun_fdops.fd_disable_dma = sun_fd_disable_dma;
 758         sun_fdops.fd_set_dma_mode = sun_fd_set_dma_mode;
 759         sun_fdops.fd_set_dma_addr = sun_fd_set_dma_addr;
 760         sun_fdops.fd_set_dma_count = sun_fd_set_dma_count;
 761         sun_fdops.get_dma_residue = sun_get_dma_residue;
 762
 763         sun_fdops.fd_request_irq = sun_fd_request_irq;
 764         sun_fdops.fd_free_irq = sun_fd_free_irq;
 765
 766         sun_fdops.fd_eject = sun_fd_eject;
 767
 768         fdc_status = (unsigned long) &sun_fdc->status_82077;
 769
 770         /* Success... */
 771         allowed_drive_mask = 0x01;
 772         sun_floppy_types[0] = 4;
 773         sun_floppy_types[1] = 0;
 774
 775         return sun_floppy_types[0];
 776 }
 777
 778 #define EXTRA_FLOPPY_PARAMS
 779
 780 static DEFINE_SPINLOCK(dma_spin_lock);
 781
 782 #define claim_dma_lock() \
 783 ({      unsigned long flags; \
 784         spin_lock_irqsave(&dma_spin_lock, flags); \
 785         flags; \
 786 })
 787
 788 #define release_dma_lock(__flags) \
 789         spin_unlock_irqrestore(&dma_spin_lock, __flags);
 790
 791 #endif /* !(__ASM_SPARC64_FLOPPY_H) */