cleanup floppy.h
[sfrench/cifs-2.6.git] / 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) */