1/* SPDX-License-Identifier: GPL-2.0 */
2/* floppy.h: Sparc specific parts of the Floppy driver.
3 *
4 * Copyright (C) 1996, 2007, 2008 David S. Miller (davem@davemloft.net)
5 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 *
7 * Ultra/PCI support added: Sep 1997  Eddie C. Dost  (ecd@skynet.be)
8 */
9
10#ifndef __ASM_SPARC64_FLOPPY_H
11#define __ASM_SPARC64_FLOPPY_H
12
13#include <linux/of.h>
14#include <linux/of_platform.h>
15#include <linux/dma-mapping.h>
16
17#include <asm/auxio.h>
18
19/*
20 * Define this to enable exchanging drive 0 and 1 if only drive 1 is
21 * probed on PCI machines.
22 */
23#undef PCI_FDC_SWAP_DRIVES
24
25
26/* References:
27 * 1) Netbsd Sun floppy driver.
28 * 2) NCR 82077 controller manual
29 * 3) Intel 82077 controller manual
30 */
31struct sun_flpy_controller {
32	volatile unsigned char status1_82077; /* Auxiliary Status reg. 1 */
33	volatile unsigned char status2_82077; /* Auxiliary Status reg. 2 */
34	volatile unsigned char dor_82077;     /* Digital Output reg. */
35	volatile unsigned char tapectl_82077; /* Tape Control reg */
36	volatile unsigned char status_82077;  /* Main Status Register. */
37#define drs_82077              status_82077   /* Digital Rate Select reg. */
38	volatile unsigned char data_82077;    /* Data fifo. */
39	volatile unsigned char ___unused;
40	volatile unsigned char dir_82077;     /* Digital Input reg. */
41#define dcr_82077              dir_82077      /* Config Control reg. */
42};
43
44/* You'll only ever find one controller on an Ultra anyways. */
45static struct sun_flpy_controller *sun_fdc = (struct sun_flpy_controller *)-1;
46unsigned long fdc_status;
47static struct platform_device *floppy_op = NULL;
48
49struct sun_floppy_ops {
50	unsigned char	(*fd_inb) (unsigned long port, unsigned int reg);
51	void		(*fd_outb) (unsigned char value, unsigned long base,
52				    unsigned int reg);
53	void		(*fd_enable_dma) (void);
54	void		(*fd_disable_dma) (void);
55	void		(*fd_set_dma_mode) (int);
56	void		(*fd_set_dma_addr) (char *);
57	void		(*fd_set_dma_count) (int);
58	unsigned int	(*get_dma_residue) (void);
59	int		(*fd_request_irq) (void);
60	void		(*fd_free_irq) (void);
61	int		(*fd_eject) (int);
62};
63
64static struct sun_floppy_ops sun_fdops;
65
66#define fd_inb(base, reg)         sun_fdops.fd_inb(base, reg)
67#define fd_outb(value, base, reg) sun_fdops.fd_outb(value, base, reg)
68#define fd_enable_dma()           sun_fdops.fd_enable_dma()
69#define fd_disable_dma()          sun_fdops.fd_disable_dma()
70#define fd_request_dma()          (0) /* nothing... */
71#define fd_free_dma()             /* nothing... */
72#define fd_clear_dma_ff()         /* nothing... */
73#define fd_set_dma_mode(mode)     sun_fdops.fd_set_dma_mode(mode)
74#define fd_set_dma_addr(addr)     sun_fdops.fd_set_dma_addr(addr)
75#define fd_set_dma_count(count)   sun_fdops.fd_set_dma_count(count)
76#define get_dma_residue(x)        sun_fdops.get_dma_residue()
77#define fd_request_irq()          sun_fdops.fd_request_irq()
78#define fd_free_irq()             sun_fdops.fd_free_irq()
79#define fd_eject(drive)           sun_fdops.fd_eject(drive)
80
81/* Super paranoid... */
82#undef HAVE_DISABLE_HLT
83
84static int sun_floppy_types[2] = { 0, 0 };
85
86/* Here is where we catch the floppy driver trying to initialize,
87 * therefore this is where we call the PROM device tree probing
88 * routine etc. on the Sparc.
89 */
90#define FLOPPY0_TYPE		sun_floppy_init()
91#define FLOPPY1_TYPE		sun_floppy_types[1]
92
93#define FDC1			((unsigned long)sun_fdc)
94
95#define N_FDC    1
96#define N_DRIVE  8
97
98/* No 64k boundary crossing problems on the Sparc. */
99#define CROSS_64KB(a,s) (0)
100
101static unsigned char sun_82077_fd_inb(unsigned long base, unsigned int reg)
102{
103	udelay(5);
104	switch (reg) {
105	default:
106		printk("floppy: Asked to read unknown port %x\n", reg);
107		panic("floppy: Port bolixed.");
108	case FD_STATUS:
109		return sbus_readb(&sun_fdc->status_82077) & ~STATUS_DMA;
110	case FD_DATA:
111		return sbus_readb(&sun_fdc->data_82077);
112	case FD_DIR:
113		/* XXX: Is DCL on 0x80 in sun4m? */
114		return sbus_readb(&sun_fdc->dir_82077);
115	}
116	panic("sun_82072_fd_inb: How did I get here?");
117}
118
119static void sun_82077_fd_outb(unsigned char value, unsigned long base,
120			      unsigned int reg)
121{
122	udelay(5);
123	switch (reg) {
124	default:
125		printk("floppy: Asked to write to unknown port %x\n", reg);
126		panic("floppy: Port bolixed.");
127	case FD_DOR:
128		/* Happily, the 82077 has a real DOR register. */
129		sbus_writeb(value, &sun_fdc->dor_82077);
130		break;
131	case FD_DATA:
132		sbus_writeb(value, &sun_fdc->data_82077);
133		break;
134	case FD_DCR:
135		sbus_writeb(value, &sun_fdc->dcr_82077);
136		break;
137	case FD_DSR:
138		sbus_writeb(value, &sun_fdc->status_82077);
139		break;
140	}
141	return;
142}
143
144/* For pseudo-dma (Sun floppy drives have no real DMA available to
145 * them so we must eat the data fifo bytes directly ourselves) we have
146 * three state variables.  doing_pdma tells our inline low-level
147 * assembly floppy interrupt entry point whether it should sit and eat
148 * bytes from the fifo or just transfer control up to the higher level
149 * floppy interrupt c-code.  I tried very hard but I could not get the
150 * pseudo-dma to work in c-code without getting many overruns and
151 * underruns.  If non-zero, doing_pdma encodes the direction of
152 * the transfer for debugging.  1=read 2=write
153 */
154unsigned char *pdma_vaddr;
155unsigned long pdma_size;
156volatile int doing_pdma = 0;
157
158/* This is software state */
159char *pdma_base = NULL;
160unsigned long pdma_areasize;
161
162/* Common routines to all controller types on the Sparc. */
163static void sun_fd_disable_dma(void)
164{
165	doing_pdma = 0;
166	pdma_base = NULL;
167}
168
169static void sun_fd_set_dma_mode(int mode)
170{
171	switch(mode) {
172	case DMA_MODE_READ:
173		doing_pdma = 1;
174		break;
175	case DMA_MODE_WRITE:
176		doing_pdma = 2;
177		break;
178	default:
179		printk("Unknown dma mode %d\n", mode);
180		panic("floppy: Giving up...");
181	}
182}
183
184static void sun_fd_set_dma_addr(char *buffer)
185{
186	pdma_vaddr = buffer;
187}
188
189static void sun_fd_set_dma_count(int length)
190{
191	pdma_size = length;
192}
193
194static void sun_fd_enable_dma(void)
195{
196	pdma_base = pdma_vaddr;
197	pdma_areasize = pdma_size;
198}
199
200irqreturn_t sparc_floppy_irq(int irq, void *dev_cookie)
201{
202	if (likely(doing_pdma)) {
203		void __iomem *stat = (void __iomem *) fdc_status;
204		unsigned char *vaddr = pdma_vaddr;
205		unsigned long size = pdma_size;
206		u8 val;
207
208		while (size) {
209			val = readb(stat);
210			if (unlikely(!(val & 0x80))) {
211				pdma_vaddr = vaddr;
212				pdma_size = size;
213				return IRQ_HANDLED;
214			}
215			if (unlikely(!(val & 0x20))) {
216				pdma_vaddr = vaddr;
217				pdma_size = size;
218				doing_pdma = 0;
219				goto main_interrupt;
220			}
221			if (val & 0x40) {
222				/* read */
223				*vaddr++ = readb(stat + 1);
224			} else {
225				unsigned char data = *vaddr++;
226
227				/* write */
228				writeb(data, stat + 1);
229			}
230			size--;
231		}
232
233		pdma_vaddr = vaddr;
234		pdma_size = size;
235
236		/* Send Terminal Count pulse to floppy controller. */
237		val = readb(auxio_register);
238		val |= AUXIO_AUX1_FTCNT;
239		writeb(val, auxio_register);
240		val &= ~AUXIO_AUX1_FTCNT;
241		writeb(val, auxio_register);
242
243		doing_pdma = 0;
244	}
245
246main_interrupt:
247	return floppy_interrupt(irq, dev_cookie);
248}
249
250static int sun_fd_request_irq(void)
251{
252	static int once = 0;
253	int error;
254
255	if(!once) {
256		once = 1;
257
258		error = request_irq(FLOPPY_IRQ, sparc_floppy_irq,
259				    0, "floppy", NULL);
260
261		return ((error == 0) ? 0 : -1);
262	}
263	return 0;
264}
265
266static void sun_fd_free_irq(void)
267{
268}
269
270static unsigned int sun_get_dma_residue(void)
271{
272	/* XXX This isn't really correct. XXX */
273	return 0;
274}
275
276static int sun_fd_eject(int drive)
277{
278	set_dor(0x00, 0xff, 0x90);
279	udelay(500);
280	set_dor(0x00, 0x6f, 0x00);
281	udelay(500);
282	return 0;
283}
284
285#include <asm/ebus_dma.h>
286#include <asm/ns87303.h>
287
288static struct ebus_dma_info sun_pci_fd_ebus_dma;
289static struct device *sun_floppy_dev;
290static int sun_pci_broken_drive = -1;
291
292struct sun_pci_dma_op {
293	unsigned int 	addr;
294	int		len;
295	int		direction;
296	char		*buf;
297};
298static struct sun_pci_dma_op sun_pci_dma_current = { -1U, 0, 0, NULL};
299static struct sun_pci_dma_op sun_pci_dma_pending = { -1U, 0, 0, NULL};
300
301irqreturn_t floppy_interrupt(int irq, void *dev_id);
302
303static unsigned char sun_pci_fd_inb(unsigned long base, unsigned int reg)
304{
305	udelay(5);
306	return inb(base + reg);
307}
308
309static void sun_pci_fd_outb(unsigned char val, unsigned long base,
310			    unsigned int reg)
311{
312	udelay(5);
313	outb(val, base + reg);
314}
315
316static void sun_pci_fd_broken_outb(unsigned char val, unsigned long base,
317				   unsigned int reg)
318{
319	udelay(5);
320	/*
321	 * XXX: Due to SUN's broken floppy connector on AX and AXi
322	 *      we need to turn on MOTOR_0 also, if the floppy is
323	 *      jumpered to DS1 (like most PC floppies are). I hope
324	 *      this does not hurt correct hardware like the AXmp.
325	 *      (Eddie, Sep 12 1998).
326	 */
327	if (reg == FD_DOR) {
328		if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x20)) {
329			val |= 0x10;
330		}
331	}
332	outb(val, base + reg);
333}
334
335#ifdef PCI_FDC_SWAP_DRIVES
336static void sun_pci_fd_lde_broken_outb(unsigned char val, unsigned long base,
337				       unsigned int reg)
338{
339	udelay(5);
340	/*
341	 * XXX: Due to SUN's broken floppy connector on AX and AXi
342	 *      we need to turn on MOTOR_0 also, if the floppy is
343	 *      jumpered to DS1 (like most PC floppies are). I hope
344	 *      this does not hurt correct hardware like the AXmp.
345	 *      (Eddie, Sep 12 1998).
346	 */
347	if (reg == FD_DOR) {
348		if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x10)) {
349			val &= ~(0x03);
350			val |= 0x21;
351		}
352	}
353	outb(val, base + reg);
354}
355#endif /* PCI_FDC_SWAP_DRIVES */
356
357static void sun_pci_fd_enable_dma(void)
358{
359	BUG_ON((NULL == sun_pci_dma_pending.buf) 	||
360	    (0	  == sun_pci_dma_pending.len) 	||
361	    (0	  == sun_pci_dma_pending.direction));
362
363	sun_pci_dma_current.buf = sun_pci_dma_pending.buf;
364	sun_pci_dma_current.len = sun_pci_dma_pending.len;
365	sun_pci_dma_current.direction = sun_pci_dma_pending.direction;
366
367	sun_pci_dma_pending.buf  = NULL;
368	sun_pci_dma_pending.len  = 0;
369	sun_pci_dma_pending.direction = 0;
370	sun_pci_dma_pending.addr = -1U;
371
372	sun_pci_dma_current.addr =
373		dma_map_single(sun_floppy_dev,
374			       sun_pci_dma_current.buf,
375			       sun_pci_dma_current.len,
376			       sun_pci_dma_current.direction);
377
378	ebus_dma_enable(&sun_pci_fd_ebus_dma, 1);
379
380	if (ebus_dma_request(&sun_pci_fd_ebus_dma,
381			     sun_pci_dma_current.addr,
382			     sun_pci_dma_current.len))
383		BUG();
384}
385
386static void sun_pci_fd_disable_dma(void)
387{
388	ebus_dma_enable(&sun_pci_fd_ebus_dma, 0);
389	if (sun_pci_dma_current.addr != -1U)
390		dma_unmap_single(sun_floppy_dev,
391				 sun_pci_dma_current.addr,
392				 sun_pci_dma_current.len,
393				 sun_pci_dma_current.direction);
394	sun_pci_dma_current.addr = -1U;
395}
396
397static void sun_pci_fd_set_dma_mode(int mode)
398{
399	if (mode == DMA_MODE_WRITE)
400		sun_pci_dma_pending.direction = DMA_TO_DEVICE;
401	else
402		sun_pci_dma_pending.direction = DMA_FROM_DEVICE;
403
404	ebus_dma_prepare(&sun_pci_fd_ebus_dma, mode != DMA_MODE_WRITE);
405}
406
407static void sun_pci_fd_set_dma_count(int length)
408{
409	sun_pci_dma_pending.len = length;
410}
411
412static void sun_pci_fd_set_dma_addr(char *buffer)
413{
414	sun_pci_dma_pending.buf = buffer;
415}
416
417static unsigned int sun_pci_get_dma_residue(void)
418{
419	return ebus_dma_residue(&sun_pci_fd_ebus_dma);
420}
421
422static int sun_pci_fd_request_irq(void)
423{
424	return ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 1);
425}
426
427static void sun_pci_fd_free_irq(void)
428{
429	ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 0);
430}
431
432static int sun_pci_fd_eject(int drive)
433{
434	return -EINVAL;
435}
436
437void sun_pci_fd_dma_callback(struct ebus_dma_info *p, int event, void *cookie)
438{
439	floppy_interrupt(0, NULL);
440}
441
442/*
443 * Floppy probing, we'd like to use /dev/fd0 for a single Floppy on PCI,
444 * even if this is configured using DS1, thus looks like /dev/fd1 with
445 * the cabling used in Ultras.
446 */
447#define DOR	(port + 2)
448#define MSR	(port + 4)
449#define FIFO	(port + 5)
450
451static void sun_pci_fd_out_byte(unsigned long port, unsigned char val,
452			        unsigned long reg)
453{
454	unsigned char status;
455	int timeout = 1000;
456
457	while (!((status = inb(MSR)) & 0x80) && --timeout)
458		udelay(100);
459	outb(val, reg);
460}
461
462static unsigned char sun_pci_fd_sensei(unsigned long port)
463{
464	unsigned char result[2] = { 0x70, 0x00 };
465	unsigned char status;
466	int i = 0;
467
468	sun_pci_fd_out_byte(port, 0x08, FIFO);
469	do {
470		int timeout = 1000;
471
472		while (!((status = inb(MSR)) & 0x80) && --timeout)
473			udelay(100);
474
475		if (!timeout)
476			break;
477
478		if ((status & 0xf0) == 0xd0)
479			result[i++] = inb(FIFO);
480		else
481			break;
482	} while (i < 2);
483
484	return result[0];
485}
486
487static void sun_pci_fd_reset(unsigned long port)
488{
489	unsigned char mask = 0x00;
490	unsigned char status;
491	int timeout = 10000;
492
493	outb(0x80, MSR);
494	do {
495		status = sun_pci_fd_sensei(port);
496		if ((status & 0xc0) == 0xc0)
497			mask |= 1 << (status & 0x03);
498		else
499			udelay(100);
500	} while ((mask != 0x0f) && --timeout);
501}
502
503static int sun_pci_fd_test_drive(unsigned long port, int drive)
504{
505	unsigned char status, data;
506	int timeout = 1000;
507	int ready;
508
509	sun_pci_fd_reset(port);
510
511	data = (0x10 << drive) | 0x0c | drive;
512	sun_pci_fd_out_byte(port, data, DOR);
513
514	sun_pci_fd_out_byte(port, 0x07, FIFO);
515	sun_pci_fd_out_byte(port, drive & 0x03, FIFO);
516
517	do {
518		udelay(100);
519		status = sun_pci_fd_sensei(port);
520	} while (((status & 0xc0) == 0x80) && --timeout);
521
522	if (!timeout)
523		ready = 0;
524	else
525		ready = (status & 0x10) ? 0 : 1;
526
527	sun_pci_fd_reset(port);
528	return ready;
529}
530#undef FIFO
531#undef MSR
532#undef DOR
533
534static int __init ebus_fdthree_p(struct device_node *dp)
535{
536	if (of_node_name_eq(dp, "fdthree"))
537		return 1;
538	if (of_node_name_eq(dp, "floppy")) {
539		const char *compat;
540
541		compat = of_get_property(dp, "compatible", NULL);
542		if (compat && !strcmp(compat, "fdthree"))
543			return 1;
544	}
545	return 0;
546}
547
548static unsigned long __init sun_floppy_init(void)
549{
550	static int initialized = 0;
551	struct device_node *dp;
552	struct platform_device *op;
553	const char *prop;
554	char state[128];
555
556	if (initialized)
557		return sun_floppy_types[0];
558	initialized = 1;
559
560	op = NULL;
561
562	for_each_node_by_name(dp, "SUNW,fdtwo") {
563		if (!of_node_name_eq(dp->parent, "sbus"))
564			continue;
565		op = of_find_device_by_node(dp);
566		if (op)
567			break;
568	}
569	if (op) {
570		floppy_op = op;
571		FLOPPY_IRQ = op->archdata.irqs[0];
572	} else {
573		struct device_node *ebus_dp;
574		void __iomem *auxio_reg;
575		const char *state_prop;
576		unsigned long config;
577
578		dp = NULL;
579		for_each_node_by_name(ebus_dp, "ebus") {
580			for (dp = ebus_dp->child; dp; dp = dp->sibling) {
581				if (ebus_fdthree_p(dp))
582					goto found_fdthree;
583			}
584		}
585	found_fdthree:
586		if (!dp)
587			return 0;
588
589		op = of_find_device_by_node(dp);
590		if (!op)
591			return 0;
592
593		state_prop = of_get_property(op->dev.of_node, "status", NULL);
594		if (state_prop && !strncmp(state_prop, "disabled", 8))
595			return 0;
596
597		FLOPPY_IRQ = op->archdata.irqs[0];
598
599		/* Make sure the high density bit is set, some systems
600		 * (most notably Ultra5/Ultra10) come up with it clear.
601		 */
602		auxio_reg = (void __iomem *) op->resource[2].start;
603		writel(readl(auxio_reg)|0x2, auxio_reg);
604
605		sun_floppy_dev = &op->dev;
606
607		spin_lock_init(&sun_pci_fd_ebus_dma.lock);
608
609		/* XXX ioremap */
610		sun_pci_fd_ebus_dma.regs = (void __iomem *)
611			op->resource[1].start;
612		if (!sun_pci_fd_ebus_dma.regs)
613			return 0;
614
615		sun_pci_fd_ebus_dma.flags = (EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
616					     EBUS_DMA_FLAG_TCI_DISABLE);
617		sun_pci_fd_ebus_dma.callback = sun_pci_fd_dma_callback;
618		sun_pci_fd_ebus_dma.client_cookie = NULL;
619		sun_pci_fd_ebus_dma.irq = FLOPPY_IRQ;
620		strcpy(sun_pci_fd_ebus_dma.name, "floppy");
621		if (ebus_dma_register(&sun_pci_fd_ebus_dma))
622			return 0;
623
624		/* XXX ioremap */
625		sun_fdc = (struct sun_flpy_controller *) op->resource[0].start;
626
627		sun_fdops.fd_inb = sun_pci_fd_inb;
628		sun_fdops.fd_outb = sun_pci_fd_outb;
629
630		can_use_virtual_dma = use_virtual_dma = 0;
631		sun_fdops.fd_enable_dma = sun_pci_fd_enable_dma;
632		sun_fdops.fd_disable_dma = sun_pci_fd_disable_dma;
633		sun_fdops.fd_set_dma_mode = sun_pci_fd_set_dma_mode;
634		sun_fdops.fd_set_dma_addr = sun_pci_fd_set_dma_addr;
635		sun_fdops.fd_set_dma_count = sun_pci_fd_set_dma_count;
636		sun_fdops.get_dma_residue = sun_pci_get_dma_residue;
637
638		sun_fdops.fd_request_irq = sun_pci_fd_request_irq;
639		sun_fdops.fd_free_irq = sun_pci_fd_free_irq;
640
641		sun_fdops.fd_eject = sun_pci_fd_eject;
642
643		fdc_status = (unsigned long) &sun_fdc->status_82077;
644
645		/*
646		 * XXX: Find out on which machines this is really needed.
647		 */
648		if (1) {
649			sun_pci_broken_drive = 1;
650			sun_fdops.fd_outb = sun_pci_fd_broken_outb;
651		}
652
653		allowed_drive_mask = 0;
654		if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 0))
655			sun_floppy_types[0] = 4;
656		if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 1))
657			sun_floppy_types[1] = 4;
658
659		/*
660		 * Find NS87303 SuperIO config registers (through ecpp).
661		 */
662		config = 0;
663		for (dp = ebus_dp->child; dp; dp = dp->sibling) {
664			if (of_node_name_eq(dp, "ecpp")) {
665				struct platform_device *ecpp_op;
666
667				ecpp_op = of_find_device_by_node(dp);
668				if (ecpp_op)
669					config = ecpp_op->resource[1].start;
670				goto config_done;
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	}
720	prop = of_get_property(op->dev.of_node, "status", NULL);
721	if (prop && !strncmp(state, "disabled", 8))
722		return 0;
723
724	/*
725	 * We cannot do of_ioremap here: it does request_region,
726	 * which the generic floppy driver tries to do once again.
727	 * But we must use the sdev resource values as they have
728	 * had parent ranges applied.
729	 */
730	sun_fdc = (struct sun_flpy_controller *)
731		(op->resource[0].start +
732		 ((op->resource[0].flags & 0x1ffUL) << 32UL));
733
734	/* Last minute sanity check... */
735	if (sbus_readb(&sun_fdc->status1_82077) == 0xff) {
736		sun_fdc = (struct sun_flpy_controller *)-1;
737		return 0;
738	}
739
740        sun_fdops.fd_inb = sun_82077_fd_inb;
741        sun_fdops.fd_outb = sun_82077_fd_outb;
742
743	can_use_virtual_dma = use_virtual_dma = 1;
744	sun_fdops.fd_enable_dma = sun_fd_enable_dma;
745	sun_fdops.fd_disable_dma = sun_fd_disable_dma;
746	sun_fdops.fd_set_dma_mode = sun_fd_set_dma_mode;
747	sun_fdops.fd_set_dma_addr = sun_fd_set_dma_addr;
748	sun_fdops.fd_set_dma_count = sun_fd_set_dma_count;
749	sun_fdops.get_dma_residue = sun_get_dma_residue;
750
751	sun_fdops.fd_request_irq = sun_fd_request_irq;
752	sun_fdops.fd_free_irq = sun_fd_free_irq;
753
754	sun_fdops.fd_eject = sun_fd_eject;
755
756        fdc_status = (unsigned long) &sun_fdc->status_82077;
757
758	/* Success... */
759	allowed_drive_mask = 0x01;
760	sun_floppy_types[0] = 4;
761	sun_floppy_types[1] = 0;
762
763	return sun_floppy_types[0];
764}
765
766#define EXTRA_FLOPPY_PARAMS
767
768static DEFINE_SPINLOCK(dma_spin_lock);
769
770#define claim_dma_lock() \
771({	unsigned long flags; \
772	spin_lock_irqsave(&dma_spin_lock, flags); \
773	flags; \
774})
775
776#define release_dma_lock(__flags) \
777	spin_unlock_irqrestore(&dma_spin_lock, __flags);
778
779#endif /* !(__ASM_SPARC64_FLOPPY_H) */
780