aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc/include/asm/floppy_64.h
blob: e204f902e6c9f3088ef11ea8dd571c80ba48b7f4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
/* floppy.h: Sparc specific parts of the Floppy driver.
 *
 * Copyright (C) 1996, 2007, 2008 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 *
 * Ultra/PCI support added: Sep 1997  Eddie C. Dost  (ecd@skynet.be)
 */

#ifndef __ASM_SPARC64_FLOPPY_H
#define __ASM_SPARC64_FLOPPY_H

#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/dma-mapping.h>

#include <asm/auxio.h>

/*
 * Define this to enable exchanging drive 0 and 1 if only drive 1 is
 * probed on PCI machines.
 */
#undef PCI_FDC_SWAP_DRIVES


/* References:
 * 1) Netbsd Sun floppy driver.
 * 2) NCR 82077 controller manual
 * 3) Intel 82077 controller manual
 */
struct sun_flpy_controller {
	volatile unsigned char status1_82077; /* Auxiliary Status reg. 1 */
	volatile unsigned char status2_82077; /* Auxiliary Status reg. 2 */
	volatile unsigned char dor_82077;     /* Digital Output reg. */
	volatile unsigned char tapectl_82077; /* Tape Control reg */
	volatile unsigned char status_82077;  /* Main Status Register. */
#define drs_82077              status_82077   /* Digital Rate Select reg. */
	volatile unsigned char data_82077;    /* Data fifo. */
	volatile unsigned char ___unused;
	volatile unsigned char dir_82077;     /* Digital Input reg. */
#define dcr_82077              dir_82077      /* Config Control reg. */
};

/* You'll only ever find one controller on an Ultra anyways. */
static struct sun_flpy_controller *sun_fdc = (struct sun_flpy_controller *)-1;
unsigned long fdc_status;
static struct platform_device *floppy_op = NULL;

struct sun_floppy_ops {
	unsigned char	(*fd_inb) (unsigned long port);
	void		(*fd_outb) (unsigned char value, unsigned long port);
	void		(*fd_enable_dma) (void);
	void		(*fd_disable_dma) (void);
	void		(*fd_set_dma_mode) (int);
	void		(*fd_set_dma_addr) (char *);
	void		(*fd_set_dma_count) (int);
	unsigned int	(*get_dma_residue) (void);
	int		(*fd_request_irq) (void);
	void		(*fd_free_irq) (void);
	int		(*fd_eject) (int);
};

static struct sun_floppy_ops sun_fdops;

#define fd_inb(port)              sun_fdops.fd_inb(port)
#define fd_outb(value,port)       sun_fdops.fd_outb(value,port)
#define fd_enable_dma()           sun_fdops.fd_enable_dma()
#define fd_disable_dma()          sun_fdops.fd_disable_dma()
#define fd_request_dma()          (0) /* nothing... */
#define fd_free_dma()             /* nothing... */
#define fd_clear_dma_ff()         /* nothing... */
#define fd_set_dma_mode(mode)     sun_fdops.fd_set_dma_mode(mode)
#define fd_set_dma_addr(addr)     sun_fdops.fd_set_dma_addr(addr)
#define fd_set_dma_count(count)   sun_fdops.fd_set_dma_count(count)
#define get_dma_residue(x)        sun_fdops.get_dma_residue()
#define fd_cacheflush(addr, size) /* nothing... */
#define fd_request_irq()          sun_fdops.fd_request_irq()
#define fd_free_irq()             sun_fdops.fd_free_irq()
#define fd_eject(drive)           sun_fdops.fd_eject(drive)

/* Super paranoid... */
#undef HAVE_DISABLE_HLT

static int sun_floppy_types[2] = { 0, 0 };

/* Here is where we catch the floppy driver trying to initialize,
 * therefore this is where we call the PROM device tree probing
 * routine etc. on the Sparc.
 */
#define FLOPPY0_TYPE		sun_floppy_init()
#define FLOPPY1_TYPE		sun_floppy_types[1]

#define FDC1			((unsigned long)sun_fdc)

#define N_FDC    1
#define N_DRIVE  8

/* No 64k boundary crossing problems on the Sparc. */
#define CROSS_64KB(a,s) (0)

static unsigned char sun_82077_fd_inb(unsigned long port)
{
	udelay(5);
	switch(port & 7) {
	default:
		printk("floppy: Asked to read unknown port %lx\n", port);
		panic("floppy: Port bolixed.");
	case 4: /* FD_STATUS */
		return sbus_readb(&sun_fdc->status_82077) & ~STATUS_DMA;
	case 5: /* FD_DATA */
		return sbus_readb(&sun_fdc->data_82077);
	case 7: /* FD_DIR */
		/* XXX: Is DCL on 0x80 in sun4m? */
		return sbus_readb(&sun_fdc->dir_82077);
	}
	panic("sun_82072_fd_inb: How did I get here?");
}

static void sun_82077_fd_outb(unsigned char value, unsigned long port)
{
	udelay(5);
	switch(port & 7) {
	default:
		printk("floppy: Asked to write to unknown port %lx\n", port);
		panic("floppy: Port bolixed.");
	case 2: /* FD_DOR */
		/* Happily, the 82077 has a real DOR register. */
		sbus_writeb(value, &sun_fdc->dor_82077);
		break;
	case 5: /* FD_DATA */
		sbus_writeb(value, &sun_fdc->data_82077);
		break;
	case 7: /* FD_DCR */
		sbus_writeb(value, &sun_fdc->dcr_82077);
		break;
	case 4: /* FD_STATUS */
		sbus_writeb(value, &sun_fdc->status_82077);
		break;
	}
	return;
}

/* For pseudo-dma (Sun floppy drives have no real DMA available to
 * them so we must eat the data fifo bytes directly ourselves) we have
 * three state variables.  doing_pdma tells our inline low-level
 * assembly floppy interrupt entry point whether it should sit and eat
 * bytes from the fifo or just transfer control up to the higher level
 * floppy interrupt c-code.  I tried very hard but I could not get the
 * pseudo-dma to work in c-code without getting many overruns and
 * underruns.  If non-zero, doing_pdma encodes the direction of
 * the transfer for debugging.  1=read 2=write
 */
unsigned char *pdma_vaddr;
unsigned long pdma_size;
volatile int doing_pdma = 0;

/* This is software state */
char *pdma_base = NULL;
unsigned long pdma_areasize;

/* Common routines to all controller types on the Sparc. */
static void sun_fd_disable_dma(void)
{
	doing_pdma = 0;
	pdma_base = NULL;
}

static void sun_fd_set_dma_mode(int mode)
{
	switch(mode) {
	case DMA_MODE_READ:
		doing_pdma = 1;
		break;
	case DMA_MODE_WRITE:
		doing_pdma = 2;
		break;
	default:
		printk("Unknown dma mode %d\n", mode);
		panic("floppy: Giving up...");
	}
}

static void sun_fd_set_dma_addr(char *buffer)
{
	pdma_vaddr = buffer;
}

static void sun_fd_set_dma_count(int length)
{
	pdma_size = length;
}

static void sun_fd_enable_dma(void)
{
	pdma_base = pdma_vaddr;
	pdma_areasize = pdma_size;
}

irqreturn_t sparc_floppy_irq(int irq, void *dev_cookie)
{
	if (likely(doing_pdma)) {
		void __iomem *stat = (void __iomem *) fdc_status;
		unsigned char *vaddr = pdma_vaddr;
		unsigned long size = pdma_size;
		u8 val;

		while (size) {
			val = readb(stat);
			if (unlikely(!(val & 0x80))) {
				pdma_vaddr = vaddr;
				pdma_size = size;
				return IRQ_HANDLED;
			}
			if (unlikely(!(val & 0x20))) {
				pdma_vaddr = vaddr;
				pdma_size = size;
				doing_pdma = 0;
				goto main_interrupt;
			}
			if (val & 0x40) {
				/* read */
				*vaddr++ = readb(stat + 1);
			} else {
				unsigned char data = *vaddr++;

				/* write */
				writeb(data, stat + 1);
			}
			size--;
		}

		pdma_vaddr = vaddr;
		pdma_size = size;

		/* Send Terminal Count pulse to floppy controller. */
		val = readb(auxio_register);
		val |= AUXIO_AUX1_FTCNT;
		writeb(val, auxio_register);
		val &= ~AUXIO_AUX1_FTCNT;
		writeb(val, auxio_register);

		doing_pdma = 0;
	}

main_interrupt:
	return floppy_interrupt(irq, dev_cookie);
}

static int sun_fd_request_irq(void)
{
	static int once = 0;
	int error;

	if(!once) {
		once = 1;

		error = request_irq(FLOPPY_IRQ, sparc_floppy_irq,
				    IRQF_DISABLED, "floppy", NULL);

		return ((error == 0) ? 0 : -1);
	}
	return 0;
}

static void sun_fd_free_irq(void)
{
}

static unsigned int sun_get_dma_residue(void)
{
	/* XXX This isn't really correct. XXX */
	return 0;
}

static int sun_fd_eject(int drive)
{
	set_dor(0x00, 0xff, 0x90);
	udelay(500);
	set_dor(0x00, 0x6f, 0x00);
	udelay(500);
	return 0;
}

#include <asm/ebus_dma.h>
#include <asm/ns87303.h>

static struct ebus_dma_info sun_pci_fd_ebus_dma;
static struct device *sun_floppy_dev;
static int sun_pci_broken_drive = -1;

struct sun_pci_dma_op {
	unsigned int 	addr;
	int		len;
	int		direction;
	char		*buf;
};
static struct sun_pci_dma_op sun_pci_dma_current = { -1U, 0, 0, NULL};
static struct sun_pci_dma_op sun_pci_dma_pending = { -1U, 0, 0, NULL};

extern irqreturn_t floppy_interrupt(int irq, void *dev_id);

static unsigned char sun_pci_fd_inb(unsigned long port)
{
	udelay(5);
	return inb(port);
}

static void sun_pci_fd_outb(unsigned char val, unsigned long port)
{
	udelay(5);
	outb(val, port);
}

static void sun_pci_fd_broken_outb(unsigned char val, unsigned long port)
{
	udelay(5);
	/*
	 * XXX: Due to SUN's broken floppy connector on AX and AXi
	 *      we need to turn on MOTOR_0 also, if the floppy is
	 *      jumpered to DS1 (like most PC floppies are). I hope
	 *      this does not hurt correct hardware like the AXmp.
	 *      (Eddie, Sep 12 1998).
	 */
	if (port == ((unsigned long)sun_fdc) + 2) {
		if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x20)) {
			val |= 0x10;
		}
	}
	outb(val, port);
}

#ifdef PCI_FDC_SWAP_DRIVES
static void sun_pci_fd_lde_broken_outb(unsigned char val, unsigned long port)
{
	udelay(5);
	/*
	 * XXX: Due to SUN's broken floppy connector on AX and AXi
	 *      we need to turn on MOTOR_0 also, if the floppy is
	 *      jumpered to DS1 (like most PC floppies are). I hope
	 *      this does not hurt correct hardware like the AXmp.
	 *      (Eddie, Sep 12 1998).
	 */
	if (port == ((unsigned long)sun_fdc) + 2) {
		if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x10)) {
			val &= ~(0x03);
			val |= 0x21;
		}
	}
	outb(val, port);
}
#endif /* PCI_FDC_SWAP_DRIVES */

static void sun_pci_fd_enable_dma(void)
{
	BUG_ON((NULL == sun_pci_dma_pending.buf) 	||
	    (0	  == sun_pci_dma_pending.len) 	||
	    (0	  == sun_pci_dma_pending.direction));

	sun_pci_dma_current.buf = sun_pci_dma_pending.buf;
	sun_pci_dma_current.len = sun_pci_dma_pending.len;
	sun_pci_dma_current.direction = sun_pci_dma_pending.direction;

	sun_pci_dma_pending.buf  = NULL;
	sun_pci_dma_pending.len  = 0;
	sun_pci_dma_pending.direction = 0;
	sun_pci_dma_pending.addr = -1U;

	sun_pci_dma_current.addr =
		dma_map_single(sun_floppy_dev,
			       sun_pci_dma_current.buf,
			       sun_pci_dma_current.len,
			       sun_pci_dma_current.direction);

	ebus_dma_enable(&sun_pci_fd_ebus_dma, 1);

	if (ebus_dma_request(&sun_pci_fd_ebus_dma,
			     sun_pci_dma_current.addr,
			     sun_pci_dma_current.len))
		BUG();
}

static void sun_pci_fd_disable_dma(void)
{
	ebus_dma_enable(&sun_pci_fd_ebus_dma, 0);
	if (sun_pci_dma_current.addr != -1U)
		dma_unmap_single(sun_floppy_dev,
				 sun_pci_dma_current.addr,
				 sun_pci_dma_current.len,
				 sun_pci_dma_current.direction);
	sun_pci_dma_current.addr = -1U;
}

static void sun_pci_fd_set_dma_mode(int mode)
{
	if (mode == DMA_MODE_WRITE)
		sun_pci_dma_pending.direction = DMA_TO_DEVICE;
	else
		sun_pci_dma_pending.direction = DMA_FROM_DEVICE;

	ebus_dma_prepare(&sun_pci_fd_ebus_dma, mode != DMA_MODE_WRITE);
}

static void sun_pci_fd_set_dma_count(int length)
{
	sun_pci_dma_pending.len = length;
}

static void sun_pci_fd_set_dma_addr(char *buffer)
{
	sun_pci_dma_pending.buf = buffer;
}

static unsigned int sun_pci_get_dma_residue(void)
{
	return ebus_dma_residue(&sun_pci_fd_ebus_dma);
}

static int sun_pci_fd_request_irq(void)
{
	return ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 1);
}

static void sun_pci_fd_free_irq(void)
{
	ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 0);
}

static int sun_pci_fd_eject(int drive)
{
	return -EINVAL;
}

void sun_pci_fd_dma_callback(struct ebus_dma_info *p, int event, void *cookie)
{
	floppy_interrupt(0, NULL);
}

/*
 * Floppy probing, we'd like to use /dev/fd0 for a single Floppy on PCI,
 * even if this is configured using DS1, thus looks like /dev/fd1 with
 * the cabling used in Ultras.
 */
#define DOR	(port + 2)
#define MSR	(port + 4)
#define FIFO	(port + 5)

static void sun_pci_fd_out_byte(unsigned long port, unsigned char val,
			        unsigned long reg)
{
	unsigned char status;
	int timeout = 1000;

	while (!((status = inb(MSR)) & 0x80) && --timeout)
		udelay(100);
	outb(val, reg);
}

static unsigned char sun_pci_fd_sensei(unsigned long port)
{
	unsigned char result[2] = { 0x70, 0x00 };
	unsigned char status;
	int i = 0;

	sun_pci_fd_out_byte(port, 0x08, FIFO);
	do {
		int timeout = 1000;

		while (!((status = inb(MSR)) & 0x80) && --timeout)
			udelay(100);

		if (!timeout)
			break;

		if ((status & 0xf0) == 0xd0)
			result[i++] = inb(FIFO);
		else
			break;
	} while (i < 2);

	return result[0];
}

static void sun_pci_fd_reset(unsigned long port)
{
	unsigned char mask = 0x00;
	unsigned char status;
	int timeout = 10000;

	outb(0x80, MSR);
	do {
		status = sun_pci_fd_sensei(port);
		if ((status & 0xc0) == 0xc0)
			mask |= 1 << (status & 0x03);
		else
			udelay(100);
	} while ((mask != 0x0f) && --timeout);
}

static int sun_pci_fd_test_drive(unsigned long port, int drive)
{
	unsigned char status, data;
	int timeout = 1000;
	int ready;

	sun_pci_fd_reset(port);

	data = (0x10 << drive) | 0x0c | drive;
	sun_pci_fd_out_byte(port, data, DOR);

	sun_pci_fd_out_byte(port, 0x07, FIFO);
	sun_pci_fd_out_byte(port, drive & 0x03, FIFO);

	do {
		udelay(100);
		status = sun_pci_fd_sensei(port);
	} while (((status & 0xc0) == 0x80) && --timeout);

	if (!timeout)
		ready = 0;
	else
		ready = (status & 0x10) ? 0 : 1;

	sun_pci_fd_reset(port);
	return ready;
}
#undef FIFO
#undef MSR
#undef DOR

static int __init ebus_fdthree_p(struct device_node *dp)
{
	if (!strcmp(dp->name, "fdthree"))
		return 1;
	if (!strcmp(dp->name, "floppy")) {
		const char *compat;

		compat = of_get_property(dp, "compatible", NULL);
		if (compat && !strcmp(compat, "fdthree"))
			return 1;
	}
	return 0;
}

static unsigned long __init sun_floppy_init(void)
{
	static int initialized = 0;
	struct device_node *dp;
	struct platform_device *op;
	const char *prop;
	char state[128];

	if (initialized)
		return sun_floppy_types[0];
	initialized = 1;

	op = NULL;

	for_each_node_by_name(dp, "SUNW,fdtwo") {
		if (strcmp(dp->parent->name, "sbus"))
			continue;
		op = of_find_device_by_node(dp);
		if (op)
			break;
	}
	if (op) {
		floppy_op = op;
		FLOPPY_IRQ = op->archdata.irqs[0];
	} else {
		struct device_node *ebus_dp;
		void __iomem *auxio_reg;
		const char *state_prop;
		unsigned long config;

		dp = NULL;
		for_each_node_by_name(ebus_dp, "ebus") {
			for (dp = ebus_dp->child; dp; dp = dp->sibling) {
				if (ebus_fdthree_p(dp))
					goto found_fdthree;
			}
		}
	found_fdthree:
		if (!dp)
			return 0;

		op = of_find_device_by_node(dp);
		if (!op)
			return 0;

		state_prop = of_get_property(op->dev.of_node, "status", NULL);
		if (state_prop && !strncmp(state_prop, "disabled", 8))
			return 0;

		FLOPPY_IRQ = op->archdata.irqs[0];

		/* Make sure the high density bit is set, some systems
		 * (most notably Ultra5/Ultra10) come up with it clear.
		 */
		auxio_reg = (void __iomem *) op->resource[2].start;
		writel(readl(auxio_reg)|0x2, auxio_reg);

		sun_floppy_dev = &op->dev;

		spin_lock_init(&sun_pci_fd_ebus_dma.lock);

		/* XXX ioremap */
		sun_pci_fd_ebus_dma.regs = (void __iomem *)
			op->resource[1].start;
		if (!sun_pci_fd_ebus_dma.regs)
			return 0;

		sun_pci_fd_ebus_dma.flags = (EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
					     EBUS_DMA_FLAG_TCI_DISABLE);
		sun_pci_fd_ebus_dma.callback = sun_pci_fd_dma_callback;
		sun_pci_fd_ebus_dma.client_cookie = NULL;
		sun_pci_fd_ebus_dma.irq = FLOPPY_IRQ;
		strcpy(sun_pci_fd_ebus_dma.name, "floppy");
		if (ebus_dma_register(&sun_pci_fd_ebus_dma))
			return 0;

		/* XXX ioremap */
		sun_fdc = (struct sun_flpy_controller *) op->resource[0].start;

		sun_fdops.fd_inb = sun_pci_fd_inb;
		sun_fdops.fd_outb = sun_pci_fd_outb;

		can_use_virtual_dma = use_virtual_dma = 0;
		sun_fdops.fd_enable_dma = sun_pci_fd_enable_dma;
		sun_fdops.fd_disable_dma = sun_pci_fd_disable_dma;
		sun_fdops.fd_set_dma_mode = sun_pci_fd_set_dma_mode;
		sun_fdops.fd_set_dma_addr = sun_pci_fd_set_dma_addr;
		sun_fdops.fd_set_dma_count = sun_pci_fd_set_dma_count;
		sun_fdops.get_dma_residue = sun_pci_get_dma_residue;

		sun_fdops.fd_request_irq = sun_pci_fd_request_irq;
		sun_fdops.fd_free_irq = sun_pci_fd_free_irq;

		sun_fdops.fd_eject = sun_pci_fd_eject;

		fdc_status = (unsigned long) &sun_fdc->status_82077;

		/*
		 * XXX: Find out on which machines this is really needed.
		 */
		if (1) {
			sun_pci_broken_drive = 1;
			sun_fdops.fd_outb = sun_pci_fd_broken_outb;
		}

		allowed_drive_mask = 0;
		if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 0))
			sun_floppy_types[0] = 4;
		if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 1))
			sun_floppy_types[1] = 4;

		/*
		 * Find NS87303 SuperIO config registers (through ecpp).
		 */
		config = 0;
		for (dp = ebus_dp->child; dp; dp = dp->sibling) {
			if (!strcmp(dp->name, "ecpp")) {
				struct platform_device *ecpp_op;

				ecpp_op = of_find_device_by_node(dp);
				if (ecpp_op)
					config = ecpp_op->resource[1].start;
				goto config_done;
			}
		}
	config_done:

		/*
		 * Sanity check, is this really the NS87303?
		 */
		switch (config & 0x3ff) {
		case 0x02e:
		case 0x15c:
		case 0x26e:
		case 0x398:
			break;
		default:
			config = 0;
		}

		if (!config)
			return sun_floppy_types[0];

		/* Enable PC-AT mode. */
		ns87303_modify(config, ASC, 0, 0xc0);

#ifdef PCI_FDC_SWAP_DRIVES
		/*
		 * If only Floppy 1 is present, swap drives.
		 */
		if (!sun_floppy_types[0] && sun_floppy_types[1]) {
			/*
			 * Set the drive exchange bit in FCR on NS87303,
			 * make sure other bits are sane before doing so.
			 */
			ns87303_modify(config, FER, FER_EDM, 0);
			ns87303_modify(config, ASC, ASC_DRV2_SEL, 0);
			ns87303_modify(config, FCR, 0, FCR_LDE);

			config = sun_floppy_types[0];
			sun_floppy_types[0] = sun_floppy_types[1];
			sun_floppy_types[1] = config;

			if (sun_pci_broken_drive != -1) {
				sun_pci_broken_drive = 1 - sun_pci_broken_drive;
				sun_fdops.fd_outb = sun_pci_fd_lde_broken_outb;
			}
		}
#endif /* PCI_FDC_SWAP_DRIVES */

		return sun_floppy_types[0];
	}
	prop = of_get_property(op->dev.of_node, "status", NULL);
	if (prop && !strncmp(state, "disabled", 8))
		return 0;

	/*
	 * We cannot do of_ioremap here: it does request_region,
	 * which the generic floppy driver tries to do once again.
	 * But we must use the sdev resource values as they have
	 * had parent ranges applied.
	 */
	sun_fdc = (struct sun_flpy_controller *)
		(op->resource[0].start +
		 ((op->resource[0].flags & 0x1ffUL) << 32UL));

	/* Last minute sanity check... */
	if (sbus_readb(&sun_fdc->status1_82077) == 0xff) {
		sun_fdc = (struct sun_flpy_controller *)-1;
		return 0;
	}

        sun_fdops.fd_inb = sun_82077_fd_inb;
        sun_fdops.fd_outb = sun_82077_fd_outb;

	can_use_virtual_dma = use_virtual_dma = 1;
	sun_fdops.fd_enable_dma = sun_fd_enable_dma;
	sun_fdops.fd_disable_dma = sun_fd_disable_dma;
	sun_fdops.fd_set_dma_mode = sun_fd_set_dma_mode;
	sun_fdops.fd_set_dma_addr = sun_fd_set_dma_addr;
	sun_fdops.fd_set_dma_count = sun_fd_set_dma_count;
	sun_fdops.get_dma_residue = sun_get_dma_residue;

	sun_fdops.fd_request_irq = sun_fd_request_irq;
	sun_fdops.fd_free_irq = sun_fd_free_irq;

	sun_fdops.fd_eject = sun_fd_eject;

        fdc_status = (unsigned long) &sun_fdc->status_82077;

	/* Success... */
	allowed_drive_mask = 0x01;
	sun_floppy_types[0] = 4;
	sun_floppy_types[1] = 0;

	return sun_floppy_types[0];
}

#define EXTRA_FLOPPY_PARAMS

static DEFINE_SPINLOCK(dma_spin_lock);

#define claim_dma_lock() \
({	unsigned long flags; \
	spin_lock_irqsave(&dma_spin_lock, flags); \
	flags; \
})

#define release_dma_lock(__flags) \
	spin_unlock_irqrestore(&dma_spin_lock, __flags);

#endif /* !(__ASM_SPARC64_FLOPPY_H) */