PNP: skip UNSET MEM resources as well as DISABLED ones
[linux-2.6] / 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/ns87303.h>
297
298 static struct ebus_dma_info sun_pci_fd_ebus_dma;
299 static struct pci_dev *sun_pci_ebus_dev;
300 static int sun_pci_broken_drive = -1;
301
302 struct sun_pci_dma_op {
303         unsigned int    addr;
304         int             len;
305         int             direction;
306         char            *buf;
307 };
308 static struct sun_pci_dma_op sun_pci_dma_current = { -1U, 0, 0, NULL};
309 static struct sun_pci_dma_op sun_pci_dma_pending = { -1U, 0, 0, NULL};
310
311 extern irqreturn_t floppy_interrupt(int irq, void *dev_id);
312
313 static unsigned char sun_pci_fd_inb(unsigned long port)
314 {
315         udelay(5);
316         return inb(port);
317 }
318
319 static void sun_pci_fd_outb(unsigned char val, unsigned long port)
320 {
321         udelay(5);
322         outb(val, port);
323 }
324
325 static void sun_pci_fd_broken_outb(unsigned char val, unsigned long port)
326 {
327         udelay(5);
328         /*
329          * XXX: Due to SUN's broken floppy connector on AX and AXi
330          *      we need to turn on MOTOR_0 also, if the floppy is
331          *      jumpered to DS1 (like most PC floppies are). I hope
332          *      this does not hurt correct hardware like the AXmp.
333          *      (Eddie, Sep 12 1998).
334          */
335         if (port == ((unsigned long)sun_fdc) + 2) {
336                 if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x20)) {
337                         val |= 0x10;
338                 }
339         }
340         outb(val, port);
341 }
342
343 #ifdef PCI_FDC_SWAP_DRIVES
344 static void sun_pci_fd_lde_broken_outb(unsigned char val, unsigned long port)
345 {
346         udelay(5);
347         /*
348          * XXX: Due to SUN's broken floppy connector on AX and AXi
349          *      we need to turn on MOTOR_0 also, if the floppy is
350          *      jumpered to DS1 (like most PC floppies are). I hope
351          *      this does not hurt correct hardware like the AXmp.
352          *      (Eddie, Sep 12 1998).
353          */
354         if (port == ((unsigned long)sun_fdc) + 2) {
355                 if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x10)) {
356                         val &= ~(0x03);
357                         val |= 0x21;
358                 }
359         }
360         outb(val, port);
361 }
362 #endif /* PCI_FDC_SWAP_DRIVES */
363
364 static void sun_pci_fd_enable_dma(void)
365 {
366         BUG_ON((NULL == sun_pci_dma_pending.buf)        ||
367             (0    == sun_pci_dma_pending.len)   ||
368             (0    == sun_pci_dma_pending.direction));
369
370         sun_pci_dma_current.buf = sun_pci_dma_pending.buf;
371         sun_pci_dma_current.len = sun_pci_dma_pending.len;
372         sun_pci_dma_current.direction = sun_pci_dma_pending.direction;
373
374         sun_pci_dma_pending.buf  = NULL;
375         sun_pci_dma_pending.len  = 0;
376         sun_pci_dma_pending.direction = 0;
377         sun_pci_dma_pending.addr = -1U;
378
379         sun_pci_dma_current.addr = 
380                 pci_map_single(sun_pci_ebus_dev,
381                                sun_pci_dma_current.buf,
382                                sun_pci_dma_current.len,
383                                sun_pci_dma_current.direction);
384
385         ebus_dma_enable(&sun_pci_fd_ebus_dma, 1);
386
387         if (ebus_dma_request(&sun_pci_fd_ebus_dma,
388                              sun_pci_dma_current.addr,
389                              sun_pci_dma_current.len))
390                 BUG();
391 }
392
393 static void sun_pci_fd_disable_dma(void)
394 {
395         ebus_dma_enable(&sun_pci_fd_ebus_dma, 0);
396         if (sun_pci_dma_current.addr != -1U)
397                 pci_unmap_single(sun_pci_ebus_dev,
398                                  sun_pci_dma_current.addr,
399                                  sun_pci_dma_current.len,
400                                  sun_pci_dma_current.direction);
401         sun_pci_dma_current.addr = -1U;
402 }
403
404 static void sun_pci_fd_set_dma_mode(int mode)
405 {
406         if (mode == DMA_MODE_WRITE)
407                 sun_pci_dma_pending.direction = PCI_DMA_TODEVICE;
408         else
409                 sun_pci_dma_pending.direction = PCI_DMA_FROMDEVICE;
410
411         ebus_dma_prepare(&sun_pci_fd_ebus_dma, mode != DMA_MODE_WRITE);
412 }
413
414 static void sun_pci_fd_set_dma_count(int length)
415 {
416         sun_pci_dma_pending.len = length;
417 }
418
419 static void sun_pci_fd_set_dma_addr(char *buffer)
420 {
421         sun_pci_dma_pending.buf = buffer;
422 }
423
424 static unsigned int sun_pci_get_dma_residue(void)
425 {
426         return ebus_dma_residue(&sun_pci_fd_ebus_dma);
427 }
428
429 static int sun_pci_fd_request_irq(void)
430 {
431         return ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 1);
432 }
433
434 static void sun_pci_fd_free_irq(void)
435 {
436         ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 0);
437 }
438
439 static int sun_pci_fd_eject(int drive)
440 {
441         return -EINVAL;
442 }
443
444 void sun_pci_fd_dma_callback(struct ebus_dma_info *p, int event, void *cookie)
445 {
446         floppy_interrupt(0, NULL);
447 }
448
449 /*
450  * Floppy probing, we'd like to use /dev/fd0 for a single Floppy on PCI,
451  * even if this is configured using DS1, thus looks like /dev/fd1 with
452  * the cabling used in Ultras.
453  */
454 #define DOR     (port + 2)
455 #define MSR     (port + 4)
456 #define FIFO    (port + 5)
457
458 static void sun_pci_fd_out_byte(unsigned long port, unsigned char val,
459                                 unsigned long reg)
460 {
461         unsigned char status;
462         int timeout = 1000;
463
464         while (!((status = inb(MSR)) & 0x80) && --timeout)
465                 udelay(100);
466         outb(val, reg);
467 }
468
469 static unsigned char sun_pci_fd_sensei(unsigned long port)
470 {
471         unsigned char result[2] = { 0x70, 0x00 };
472         unsigned char status;
473         int i = 0;
474
475         sun_pci_fd_out_byte(port, 0x08, FIFO);
476         do {
477                 int timeout = 1000;
478
479                 while (!((status = inb(MSR)) & 0x80) && --timeout)
480                         udelay(100);
481
482                 if (!timeout)
483                         break;
484
485                 if ((status & 0xf0) == 0xd0)
486                         result[i++] = inb(FIFO);
487                 else
488                         break;
489         } while (i < 2);
490
491         return result[0];
492 }
493
494 static void sun_pci_fd_reset(unsigned long port)
495 {
496         unsigned char mask = 0x00;
497         unsigned char status;
498         int timeout = 10000;
499
500         outb(0x80, MSR);
501         do {
502                 status = sun_pci_fd_sensei(port);
503                 if ((status & 0xc0) == 0xc0)
504                         mask |= 1 << (status & 0x03);
505                 else
506                         udelay(100);
507         } while ((mask != 0x0f) && --timeout);
508 }
509
510 static int sun_pci_fd_test_drive(unsigned long port, int drive)
511 {
512         unsigned char status, data;
513         int timeout = 1000;
514         int ready;
515
516         sun_pci_fd_reset(port);
517
518         data = (0x10 << drive) | 0x0c | drive;
519         sun_pci_fd_out_byte(port, data, DOR);
520
521         sun_pci_fd_out_byte(port, 0x07, FIFO);
522         sun_pci_fd_out_byte(port, drive & 0x03, FIFO);
523
524         do {
525                 udelay(100);
526                 status = sun_pci_fd_sensei(port);
527         } while (((status & 0xc0) == 0x80) && --timeout);
528
529         if (!timeout)
530                 ready = 0;
531         else
532                 ready = (status & 0x10) ? 0 : 1;
533
534         sun_pci_fd_reset(port);
535         return ready;
536 }
537 #undef FIFO
538 #undef MSR
539 #undef DOR
540
541 #endif /* CONFIG_PCI */
542
543 #ifdef CONFIG_PCI
544 static int __init ebus_fdthree_p(struct linux_ebus_device *edev)
545 {
546         if (!strcmp(edev->prom_node->name, "fdthree"))
547                 return 1;
548         if (!strcmp(edev->prom_node->name, "floppy")) {
549                 const char *compat;
550
551                 compat = of_get_property(edev->prom_node,
552                                          "compatible", NULL);
553                 if (compat && !strcmp(compat, "fdthree"))
554                         return 1;
555         }
556         return 0;
557 }
558 #endif
559
560 static unsigned long __init sun_floppy_init(void)
561 {
562         char state[128];
563         struct sbus_bus *bus;
564         struct sbus_dev *sdev = NULL;
565         static int initialized = 0;
566
567         if (initialized)
568                 return sun_floppy_types[0];
569         initialized = 1;
570
571         for_all_sbusdev (sdev, bus) {
572                 if (!strcmp(sdev->prom_name, "SUNW,fdtwo")) 
573                         break;
574         }
575         if(sdev) {
576                 floppy_sdev = sdev;
577                 FLOPPY_IRQ = sdev->irqs[0];
578         } else {
579 #ifdef CONFIG_PCI
580                 struct linux_ebus *ebus;
581                 struct linux_ebus_device *edev = NULL;
582                 unsigned long config = 0;
583                 void __iomem *auxio_reg;
584                 const char *state_prop;
585
586                 for_each_ebus(ebus) {
587                         for_each_ebusdev(edev, ebus) {
588                                 if (ebus_fdthree_p(edev))
589                                         goto ebus_done;
590                         }
591                 }
592         ebus_done:
593                 if (!edev)
594                         return 0;
595
596                 state_prop = of_get_property(edev->prom_node, "status", NULL);
597                 if (state_prop && !strncmp(state_prop, "disabled", 8))
598                         return 0;
599                         
600                 FLOPPY_IRQ = edev->irqs[0];
601
602                 /* Make sure the high density bit is set, some systems
603                  * (most notably Ultra5/Ultra10) come up with it clear.
604                  */
605                 auxio_reg = (void __iomem *) edev->resource[2].start;
606                 writel(readl(auxio_reg)|0x2, auxio_reg);
607
608                 sun_pci_ebus_dev = ebus->self;
609
610                 spin_lock_init(&sun_pci_fd_ebus_dma.lock);
611
612                 /* XXX ioremap */
613                 sun_pci_fd_ebus_dma.regs = (void __iomem *)
614                         edev->resource[1].start;
615                 if (!sun_pci_fd_ebus_dma.regs)
616                         return 0;
617
618                 sun_pci_fd_ebus_dma.flags = (EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
619                                              EBUS_DMA_FLAG_TCI_DISABLE);
620                 sun_pci_fd_ebus_dma.callback = sun_pci_fd_dma_callback;
621                 sun_pci_fd_ebus_dma.client_cookie = NULL;
622                 sun_pci_fd_ebus_dma.irq = FLOPPY_IRQ;
623                 strcpy(sun_pci_fd_ebus_dma.name, "floppy");
624                 if (ebus_dma_register(&sun_pci_fd_ebus_dma))
625                         return 0;
626
627                 /* XXX ioremap */
628                 sun_fdc = (struct sun_flpy_controller *)edev->resource[0].start;
629
630                 sun_fdops.fd_inb = sun_pci_fd_inb;
631                 sun_fdops.fd_outb = sun_pci_fd_outb;
632
633                 can_use_virtual_dma = use_virtual_dma = 0;
634                 sun_fdops.fd_enable_dma = sun_pci_fd_enable_dma;
635                 sun_fdops.fd_disable_dma = sun_pci_fd_disable_dma;
636                 sun_fdops.fd_set_dma_mode = sun_pci_fd_set_dma_mode;
637                 sun_fdops.fd_set_dma_addr = sun_pci_fd_set_dma_addr;
638                 sun_fdops.fd_set_dma_count = sun_pci_fd_set_dma_count;
639                 sun_fdops.get_dma_residue = sun_pci_get_dma_residue;
640
641                 sun_fdops.fd_request_irq = sun_pci_fd_request_irq;
642                 sun_fdops.fd_free_irq = sun_pci_fd_free_irq;
643
644                 sun_fdops.fd_eject = sun_pci_fd_eject;
645
646                 fdc_status = (unsigned long) &sun_fdc->status_82077;
647
648                 /*
649                  * XXX: Find out on which machines this is really needed.
650                  */
651                 if (1) {
652                         sun_pci_broken_drive = 1;
653                         sun_fdops.fd_outb = sun_pci_fd_broken_outb;
654                 }
655
656                 allowed_drive_mask = 0;
657                 if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 0))
658                         sun_floppy_types[0] = 4;
659                 if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 1))
660                         sun_floppy_types[1] = 4;
661
662                 /*
663                  * Find NS87303 SuperIO config registers (through ecpp).
664                  */
665                 for_each_ebus(ebus) {
666                         for_each_ebusdev(edev, ebus) {
667                                 if (!strcmp(edev->prom_node->name, "ecpp")) {
668                                         config = edev->resource[1].start;
669                                         goto config_done;
670                                 }
671                         }
672                 }
673         config_done:
674
675                 /*
676                  * Sanity check, is this really the NS87303?
677                  */
678                 switch (config & 0x3ff) {
679                 case 0x02e:
680                 case 0x15c:
681                 case 0x26e:
682                 case 0x398:
683                         break;
684                 default:
685                         config = 0;
686                 }
687
688                 if (!config)
689                         return sun_floppy_types[0];
690
691                 /* Enable PC-AT mode. */
692                 ns87303_modify(config, ASC, 0, 0xc0);
693
694 #ifdef PCI_FDC_SWAP_DRIVES
695                 /*
696                  * If only Floppy 1 is present, swap drives.
697                  */
698                 if (!sun_floppy_types[0] && sun_floppy_types[1]) {
699                         /*
700                          * Set the drive exchange bit in FCR on NS87303,
701                          * make sure other bits are sane before doing so.
702                          */
703                         ns87303_modify(config, FER, FER_EDM, 0);
704                         ns87303_modify(config, ASC, ASC_DRV2_SEL, 0);
705                         ns87303_modify(config, FCR, 0, FCR_LDE);
706
707                         config = sun_floppy_types[0];
708                         sun_floppy_types[0] = sun_floppy_types[1];
709                         sun_floppy_types[1] = config;
710
711                         if (sun_pci_broken_drive != -1) {
712                                 sun_pci_broken_drive = 1 - sun_pci_broken_drive;
713                                 sun_fdops.fd_outb = sun_pci_fd_lde_broken_outb;
714                         }
715                 }
716 #endif /* PCI_FDC_SWAP_DRIVES */
717
718                 return sun_floppy_types[0];
719 #else
720                 return 0;
721 #endif
722         }
723         prom_getproperty(sdev->prom_node, "status", state, sizeof(state));
724         if(!strncmp(state, "disabled", 8))
725                 return 0;
726
727         /*
728          * We cannot do sbus_ioremap here: it does request_region,
729          * which the generic floppy driver tries to do once again.
730          * But we must use the sdev resource values as they have
731          * had parent ranges applied.
732          */
733         sun_fdc = (struct sun_flpy_controller *)
734                 (sdev->resource[0].start +
735                  ((sdev->resource[0].flags & 0x1ffUL) << 32UL));
736
737         /* Last minute sanity check... */
738         if(sbus_readb(&sun_fdc->status1_82077) == 0xff) {
739                 sun_fdc = (struct sun_flpy_controller *)-1;
740                 return 0;
741         }
742
743         sun_fdops.fd_inb = sun_82077_fd_inb;
744         sun_fdops.fd_outb = sun_82077_fd_outb;
745
746         can_use_virtual_dma = use_virtual_dma = 1;
747         sun_fdops.fd_enable_dma = sun_fd_enable_dma;
748         sun_fdops.fd_disable_dma = sun_fd_disable_dma;
749         sun_fdops.fd_set_dma_mode = sun_fd_set_dma_mode;
750         sun_fdops.fd_set_dma_addr = sun_fd_set_dma_addr;
751         sun_fdops.fd_set_dma_count = sun_fd_set_dma_count;
752         sun_fdops.get_dma_residue = sun_get_dma_residue;
753
754         sun_fdops.fd_request_irq = sun_fd_request_irq;
755         sun_fdops.fd_free_irq = sun_fd_free_irq;
756
757         sun_fdops.fd_eject = sun_fd_eject;
758
759         fdc_status = (unsigned long) &sun_fdc->status_82077;
760
761         /* Success... */
762         allowed_drive_mask = 0x01;
763         sun_floppy_types[0] = 4;
764         sun_floppy_types[1] = 0;
765
766         return sun_floppy_types[0];
767 }
768
769 #define EXTRA_FLOPPY_PARAMS
770
771 static DEFINE_SPINLOCK(dma_spin_lock);
772
773 #define claim_dma_lock() \
774 ({      unsigned long flags; \
775         spin_lock_irqsave(&dma_spin_lock, flags); \
776         flags; \
777 })
778
779 #define release_dma_lock(__flags) \
780         spin_unlock_irqrestore(&dma_spin_lock, __flags);
781
782 #endif /* !(__ASM_SPARC64_FLOPPY_H) */