1/* floppy.h: Sparc specific parts of the Floppy driver.
2 *
3 * Copyright (C) 1996, 2007, 2008 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 *
6 * Ultra/PCI support added: Sep 1997  Eddie C. Dost  (ecd@skynet.be)
7 */
8
9#ifndef __ASM_SPARC64_FLOPPY_H
10#define __ASM_SPARC64_FLOPPY_H
11
12#include <linux/of.h>
13#include <linux/of_device.h>
14#include <linux/dma-mapping.h>
15
16#include <asm/auxio.h>
17
18/*
19 * Define this to enable exchanging drive 0 and 1 if only drive 1 is
20 * probed on PCI machines.
21 */
22#undef PCI_FDC_SWAP_DRIVES
23
24
25/* References:
26 * 1) Netbsd Sun floppy driver.
27 * 2) NCR 82077 controller manual
28 * 3) Intel 82077 controller manual
29 */
30struct sun_flpy_controller {
31	volatile unsigned char status1_82077; /* Auxiliary Status reg. 1 */
32	volatile unsigned char status2_82077; /* Auxiliary Status reg. 2 */
33	volatile unsigned char dor_82077;     /* Digital Output reg. */
34	volatile unsigned char tapectl_82077; /* Tape Control reg */
35	volatile unsigned char status_82077;  /* Main Status Register. */
36#define drs_82077              status_82077   /* Digital Rate Select reg. */
37	volatile unsigned char data_82077;    /* Data fifo. */
38	volatile unsigned char ___unused;
39	volatile unsigned char dir_82077;     /* Digital Input reg. */
40#define dcr_82077              dir_82077      /* Config Control reg. */
41};
42
43/* You'll only ever find one controller on an Ultra anyways. */
44static struct sun_flpy_controller *sun_fdc = (struct sun_flpy_controller *)-1;
45unsigned long fdc_status;
46static struct platform_device *floppy_op = NULL;
47
48struct sun_floppy_ops {
49	unsigned char	(*fd_inb) (unsigned long port);
50	void		(*fd_outb) (unsigned char value, unsigned long port);
51	void		(*fd_enable_dma) (void);
52	void		(*fd_disable_dma) (void);
53	void		(*fd_set_dma_mode) (int);
54	void		(*fd_set_dma_addr) (char *);
55	void		(*fd_set_dma_count) (int);
56	unsigned int	(*get_dma_residue) (void);
57	int		(*fd_request_irq) (void);
58	void		(*fd_free_irq) (void);
59	int		(*fd_eject) (int);
60};
61
62static struct sun_floppy_ops sun_fdops;
63
64#define fd_inb(port)              sun_fdops.fd_inb(port)
65#define fd_outb(value,port)       sun_fdops.fd_outb(value,port)
66#define fd_enable_dma()           sun_fdops.fd_enable_dma()
67#define fd_disable_dma()          sun_fdops.fd_disable_dma()
68#define fd_request_dma()          (0) /* nothing... */
69#define fd_free_dma()             /* nothing... */
70#define fd_clear_dma_ff()         /* nothing... */
71#define fd_set_dma_mode(mode)     sun_fdops.fd_set_dma_mode(mode)
72#define fd_set_dma_addr(addr)     sun_fdops.fd_set_dma_addr(addr)
73#define fd_set_dma_count(count)   sun_fdops.fd_set_dma_count(count)
74#define get_dma_residue(x)        sun_fdops.get_dma_residue()
75#define fd_cacheflush(addr, size) /* nothing... */
76#define fd_request_irq()          sun_fdops.fd_request_irq()
77#define fd_free_irq()             sun_fdops.fd_free_irq()
78#define fd_eject(drive)           sun_fdops.fd_eject(drive)
79
80/* Super paranoid... */
81#undef HAVE_DISABLE_HLT
82
83static int sun_floppy_types[2] = { 0, 0 };
84
85/* Here is where we catch the floppy driver trying to initialize,
86 * therefore this is where we call the PROM device tree probing
87 * routine etc. on the Sparc.
88 */
89#define FLOPPY0_TYPE		sun_floppy_init()
90#define FLOPPY1_TYPE		sun_floppy_types[1]
91
92#define FDC1			((unsigned long)sun_fdc)
93
94#define N_FDC    1
95#define N_DRIVE  8
96
97/* No 64k boundary crossing problems on the Sparc. */
98#define CROSS_64KB(a,s) (0)
99
100static unsigned char sun_82077_fd_inb(unsigned long port)
101{
102	udelay(5);
103	switch(port & 7) {
104	default:
105		printk("floppy: Asked to read unknown port %lx\n", port);
106		panic("floppy: Port bolixed.");
107	case 4: /* FD_STATUS */
108		return sbus_readb(&sun_fdc->status_82077) & ~STATUS_DMA;
109	case 5: /* FD_DATA */
110		return sbus_readb(&sun_fdc->data_82077);
111	case 7: /* FD_DIR */
112		/* XXX: Is DCL on 0x80 in sun4m? */
113		return sbus_readb(&sun_fdc->dir_82077);
114	}
115	panic("sun_82072_fd_inb: How did I get here?");
116}
117
118static void sun_82077_fd_outb(unsigned char value, unsigned long port)
119{
120	udelay(5);
121	switch(port & 7) {
122	default:
123		printk("floppy: Asked to write to unknown port %lx\n", port);
124		panic("floppy: Port bolixed.");
125	case 2: /* FD_DOR */
126		/* Happily, the 82077 has a real DOR register. */
127		sbus_writeb(value, &sun_fdc->dor_82077);
128		break;
129	case 5: /* FD_DATA */
130		sbus_writeb(value, &sun_fdc->data_82077);
131		break;
132	case 7: /* FD_DCR */
133		sbus_writeb(value, &sun_fdc->dcr_82077);
134		break;
135	case 4: /* FD_STATUS */
136		sbus_writeb(value, &sun_fdc->status_82077);
137		break;
138	}
139	return;
140}
141
142/* For pseudo-dma (Sun floppy drives have no real DMA available to
143 * them so we must eat the data fifo bytes directly ourselves) we have
144 * three state variables.  doing_pdma tells our inline low-level
145 * assembly floppy interrupt entry point whether it should sit and eat
146 * bytes from the fifo or just transfer control up to the higher level
147 * floppy interrupt c-code.  I tried very hard but I could not get the
148 * pseudo-dma to work in c-code without getting many overruns and
149 * underruns.  If non-zero, doing_pdma encodes the direction of
150 * the transfer for debugging.  1=read 2=write
151 */
152unsigned char *pdma_vaddr;
153unsigned long pdma_size;
154volatile int doing_pdma = 0;
155
156/* This is software state */
157char *pdma_base = NULL;
158unsigned long pdma_areasize;
159
160/* Common routines to all controller types on the Sparc. */
161static void sun_fd_disable_dma(void)
162{
163	doing_pdma = 0;
164	pdma_base = NULL;
165}
166
167static void sun_fd_set_dma_mode(int mode)
168{
169	switch(mode) {
170	case DMA_MODE_READ:
171		doing_pdma = 1;
172		break;
173	case DMA_MODE_WRITE:
174		doing_pdma = 2;
175		break;
176	default:
177		printk("Unknown dma mode %d\n", mode);
178		panic("floppy: Giving up...");
179	}
180}
181
182static void sun_fd_set_dma_addr(char *buffer)
183{
184	pdma_vaddr = buffer;
185}
186
187static void sun_fd_set_dma_count(int length)
188{
189	pdma_size = length;
190}
191
192static void sun_fd_enable_dma(void)
193{
194	pdma_base = pdma_vaddr;
195	pdma_areasize = pdma_size;
196}
197
198irqreturn_t sparc_floppy_irq(int irq, void *dev_cookie)
199{
200	if (likely(doing_pdma)) {
201		void __iomem *stat = (void __iomem *) fdc_status;
202		unsigned char *vaddr = pdma_vaddr;
203		unsigned long size = pdma_size;
204		u8 val;
205
206		while (size) {
207			val = readb(stat);
208			if (unlikely(!(val & 0x80))) {
209				pdma_vaddr = vaddr;
210				pdma_size = size;
211				return IRQ_HANDLED;
212			}
213			if (unlikely(!(val & 0x20))) {
214				pdma_vaddr = vaddr;
215				pdma_size = size;
216				doing_pdma = 0;
217				goto main_interrupt;
218			}
219			if (val & 0x40) {
220				/* read */
221				*vaddr++ = readb(stat + 1);
222			} else {
223				unsigned char data = *vaddr++;
224
225				/* write */
226				writeb(data, stat + 1);
227			}
228			size--;
229		}
230
231		pdma_vaddr = vaddr;
232		pdma_size = size;
233
234		/* Send Terminal Count pulse to floppy controller. */
235		val = readb(auxio_register);
236		val |= AUXIO_AUX1_FTCNT;
237		writeb(val, auxio_register);
238		val &= ~AUXIO_AUX1_FTCNT;
239		writeb(val, auxio_register);
240
241		doing_pdma = 0;
242	}
243
244main_interrupt:
245	return floppy_interrupt(irq, dev_cookie);
246}
247
248static int sun_fd_request_irq(void)
249{
250	static int once = 0;
251	int error;
252
253	if(!once) {
254		once = 1;
255
256		error = request_irq(FLOPPY_IRQ, sparc_floppy_irq,
257				    0, "floppy", NULL);
258
259		return ((error == 0) ? 0 : -1);
260	}
261	return 0;
262}
263
264static void sun_fd_free_irq(void)
265{
266}
267
268static unsigned int sun_get_dma_residue(void)
269{
270	/* XXX This isn't really correct. XXX */
271	return 0;
272}
273
274static int sun_fd_eject(int drive)
275{
276	set_dor(0x00, 0xff, 0x90);
277	udelay(500);
278	set_dor(0x00, 0x6f, 0x00);
279	udelay(500);
280	return 0;
281}
282
283#include <asm/ebus_dma.h>
284#include <asm/ns87303.h>
285
286static struct ebus_dma_info sun_pci_fd_ebus_dma;
287static struct device *sun_floppy_dev;
288static int sun_pci_broken_drive = -1;
289
290struct sun_pci_dma_op {
291	unsigned int 	addr;
292	int		len;
293	int		direction;
294	char		*buf;
295};
296static struct sun_pci_dma_op sun_pci_dma_current = { -1U, 0, 0, NULL};
297static struct sun_pci_dma_op sun_pci_dma_pending = { -1U, 0, 0, NULL};
298
299irqreturn_t floppy_interrupt(int irq, void *dev_id);
300
301static unsigned char sun_pci_fd_inb(unsigned long port)
302{
303	udelay(5);
304	return inb(port);
305}
306
307static void sun_pci_fd_outb(unsigned char val, unsigned long port)
308{
309	udelay(5);
310	outb(val, port);
311}
312
313static void sun_pci_fd_broken_outb(unsigned char val, unsigned long port)
314{
315	udelay(5);
316	/*
317	 * XXX: Due to SUN's broken floppy connector on AX and AXi
318	 *      we need to turn on MOTOR_0 also, if the floppy is
319	 *      jumpered to DS1 (like most PC floppies are). I hope
320	 *      this does not hurt correct hardware like the AXmp.
321	 *      (Eddie, Sep 12 1998).
322	 */
323	if (port == ((unsigned long)sun_fdc) + 2) {
324		if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x20)) {
325			val |= 0x10;
326		}
327	}
328	outb(val, port);
329}
330
331#ifdef PCI_FDC_SWAP_DRIVES
332static void sun_pci_fd_lde_broken_outb(unsigned char val, unsigned long port)
333{
334	udelay(5);
335	/*
336	 * XXX: Due to SUN's broken floppy connector on AX and AXi
337	 *      we need to turn on MOTOR_0 also, if the floppy is
338	 *      jumpered to DS1 (like most PC floppies are). I hope
339	 *      this does not hurt correct hardware like the AXmp.
340	 *      (Eddie, Sep 12 1998).
341	 */
342	if (port == ((unsigned long)sun_fdc) + 2) {
343		if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x10)) {
344			val &= ~(0x03);
345			val |= 0x21;
346		}
347	}
348	outb(val, port);
349}
350#endif /* PCI_FDC_SWAP_DRIVES */
351
352static void sun_pci_fd_enable_dma(void)
353{
354	BUG_ON((NULL == sun_pci_dma_pending.buf) 	||
355	    (0	  == sun_pci_dma_pending.len) 	||
356	    (0	  == sun_pci_dma_pending.direction));
357
358	sun_pci_dma_current.buf = sun_pci_dma_pending.buf;
359	sun_pci_dma_current.len = sun_pci_dma_pending.len;
360	sun_pci_dma_current.direction = sun_pci_dma_pending.direction;
361
362	sun_pci_dma_pending.buf  = NULL;
363	sun_pci_dma_pending.len  = 0;
364	sun_pci_dma_pending.direction = 0;
365	sun_pci_dma_pending.addr = -1U;
366
367	sun_pci_dma_current.addr =
368		dma_map_single(sun_floppy_dev,
369			       sun_pci_dma_current.buf,
370			       sun_pci_dma_current.len,
371			       sun_pci_dma_current.direction);
372
373	ebus_dma_enable(&sun_pci_fd_ebus_dma, 1);
374
375	if (ebus_dma_request(&sun_pci_fd_ebus_dma,
376			     sun_pci_dma_current.addr,
377			     sun_pci_dma_current.len))
378		BUG();
379}
380
381static void sun_pci_fd_disable_dma(void)
382{
383	ebus_dma_enable(&sun_pci_fd_ebus_dma, 0);
384	if (sun_pci_dma_current.addr != -1U)
385		dma_unmap_single(sun_floppy_dev,
386				 sun_pci_dma_current.addr,
387				 sun_pci_dma_current.len,
388				 sun_pci_dma_current.direction);
389	sun_pci_dma_current.addr = -1U;
390}
391
392static void sun_pci_fd_set_dma_mode(int mode)
393{
394	if (mode == DMA_MODE_WRITE)
395		sun_pci_dma_pending.direction = DMA_TO_DEVICE;
396	else
397		sun_pci_dma_pending.direction = DMA_FROM_DEVICE;
398
399	ebus_dma_prepare(&sun_pci_fd_ebus_dma, mode != DMA_MODE_WRITE);
400}
401
402static void sun_pci_fd_set_dma_count(int length)
403{
404	sun_pci_dma_pending.len = length;
405}
406
407static void sun_pci_fd_set_dma_addr(char *buffer)
408{
409	sun_pci_dma_pending.buf = buffer;
410}
411
412static unsigned int sun_pci_get_dma_residue(void)
413{
414	return ebus_dma_residue(&sun_pci_fd_ebus_dma);
415}
416
417static int sun_pci_fd_request_irq(void)
418{
419	return ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 1);
420}
421
422static void sun_pci_fd_free_irq(void)
423{
424	ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 0);
425}
426
427static int sun_pci_fd_eject(int drive)
428{
429	return -EINVAL;
430}
431
432void sun_pci_fd_dma_callback(struct ebus_dma_info *p, int event, void *cookie)
433{
434	floppy_interrupt(0, NULL);
435}
436
437/*
438 * Floppy probing, we'd like to use /dev/fd0 for a single Floppy on PCI,
439 * even if this is configured using DS1, thus looks like /dev/fd1 with
440 * the cabling used in Ultras.
441 */
442#define DOR	(port + 2)
443#define MSR	(port + 4)
444#define FIFO	(port + 5)
445
446static void sun_pci_fd_out_byte(unsigned long port, unsigned char val,
447			        unsigned long reg)
448{
449	unsigned char status;
450	int timeout = 1000;
451
452	while (!((status = inb(MSR)) & 0x80) && --timeout)
453		udelay(100);
454	outb(val, reg);
455}
456
457static unsigned char sun_pci_fd_sensei(unsigned long port)
458{
459	unsigned char result[2] = { 0x70, 0x00 };
460	unsigned char status;
461	int i = 0;
462
463	sun_pci_fd_out_byte(port, 0x08, FIFO);
464	do {
465		int timeout = 1000;
466
467		while (!((status = inb(MSR)) & 0x80) && --timeout)
468			udelay(100);
469
470		if (!timeout)
471			break;
472
473		if ((status & 0xf0) == 0xd0)
474			result[i++] = inb(FIFO);
475		else
476			break;
477	} while (i < 2);
478
479	return result[0];
480}
481
482static void sun_pci_fd_reset(unsigned long port)
483{
484	unsigned char mask = 0x00;
485	unsigned char status;
486	int timeout = 10000;
487
488	outb(0x80, MSR);
489	do {
490		status = sun_pci_fd_sensei(port);
491		if ((status & 0xc0) == 0xc0)
492			mask |= 1 << (status & 0x03);
493		else
494			udelay(100);
495	} while ((mask != 0x0f) && --timeout);
496}
497
498static int sun_pci_fd_test_drive(unsigned long port, int drive)
499{
500	unsigned char status, data;
501	int timeout = 1000;
502	int ready;
503
504	sun_pci_fd_reset(port);
505
506	data = (0x10 << drive) | 0x0c | drive;
507	sun_pci_fd_out_byte(port, data, DOR);
508
509	sun_pci_fd_out_byte(port, 0x07, FIFO);
510	sun_pci_fd_out_byte(port, drive & 0x03, FIFO);
511
512	do {
513		udelay(100);
514		status = sun_pci_fd_sensei(port);
515	} while (((status & 0xc0) == 0x80) && --timeout);
516
517	if (!timeout)
518		ready = 0;
519	else
520		ready = (status & 0x10) ? 0 : 1;
521
522	sun_pci_fd_reset(port);
523	return ready;
524}
525#undef FIFO
526#undef MSR
527#undef DOR
528
529static int __init ebus_fdthree_p(struct device_node *dp)
530{
531	if (!strcmp(dp->name, "fdthree"))
532		return 1;
533	if (!strcmp(dp->name, "floppy")) {
534		const char *compat;
535
536		compat = of_get_property(dp, "compatible", NULL);
537		if (compat && !strcmp(compat, "fdthree"))
538			return 1;
539	}
540	return 0;
541}
542
543static unsigned long __init sun_floppy_init(void)
544{
545	static int initialized = 0;
546	struct device_node *dp;
547	struct platform_device *op;
548	const char *prop;
549	char state[128];
550
551	if (initialized)
552		return sun_floppy_types[0];
553	initialized = 1;
554
555	op = NULL;
556
557	for_each_node_by_name(dp, "SUNW,fdtwo") {
558		if (strcmp(dp->parent->name, "sbus"))
559			continue;
560		op = of_find_device_by_node(dp);
561		if (op)
562			break;
563	}
564	if (op) {
565		floppy_op = op;
566		FLOPPY_IRQ = op->archdata.irqs[0];
567	} else {
568		struct device_node *ebus_dp;
569		void __iomem *auxio_reg;
570		const char *state_prop;
571		unsigned long config;
572
573		dp = NULL;
574		for_each_node_by_name(ebus_dp, "ebus") {
575			for (dp = ebus_dp->child; dp; dp = dp->sibling) {
576				if (ebus_fdthree_p(dp))
577					goto found_fdthree;
578			}
579		}
580	found_fdthree:
581		if (!dp)
582			return 0;
583
584		op = of_find_device_by_node(dp);
585		if (!op)
586			return 0;
587
588		state_prop = of_get_property(op->dev.of_node, "status", NULL);
589		if (state_prop && !strncmp(state_prop, "disabled", 8))
590			return 0;
591
592		FLOPPY_IRQ = op->archdata.irqs[0];
593
594		/* Make sure the high density bit is set, some systems
595		 * (most notably Ultra5/Ultra10) come up with it clear.
596		 */
597		auxio_reg = (void __iomem *) op->resource[2].start;
598		writel(readl(auxio_reg)|0x2, auxio_reg);
599
600		sun_floppy_dev = &op->dev;
601
602		spin_lock_init(&sun_pci_fd_ebus_dma.lock);
603
604		/* XXX ioremap */
605		sun_pci_fd_ebus_dma.regs = (void __iomem *)
606			op->resource[1].start;
607		if (!sun_pci_fd_ebus_dma.regs)
608			return 0;
609
610		sun_pci_fd_ebus_dma.flags = (EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
611					     EBUS_DMA_FLAG_TCI_DISABLE);
612		sun_pci_fd_ebus_dma.callback = sun_pci_fd_dma_callback;
613		sun_pci_fd_ebus_dma.client_cookie = NULL;
614		sun_pci_fd_ebus_dma.irq = FLOPPY_IRQ;
615		strcpy(sun_pci_fd_ebus_dma.name, "floppy");
616		if (ebus_dma_register(&sun_pci_fd_ebus_dma))
617			return 0;
618
619		/* XXX ioremap */
620		sun_fdc = (struct sun_flpy_controller *) op->resource[0].start;
621
622		sun_fdops.fd_inb = sun_pci_fd_inb;
623		sun_fdops.fd_outb = sun_pci_fd_outb;
624
625		can_use_virtual_dma = use_virtual_dma = 0;
626		sun_fdops.fd_enable_dma = sun_pci_fd_enable_dma;
627		sun_fdops.fd_disable_dma = sun_pci_fd_disable_dma;
628		sun_fdops.fd_set_dma_mode = sun_pci_fd_set_dma_mode;
629		sun_fdops.fd_set_dma_addr = sun_pci_fd_set_dma_addr;
630		sun_fdops.fd_set_dma_count = sun_pci_fd_set_dma_count;
631		sun_fdops.get_dma_residue = sun_pci_get_dma_residue;
632
633		sun_fdops.fd_request_irq = sun_pci_fd_request_irq;
634		sun_fdops.fd_free_irq = sun_pci_fd_free_irq;
635
636		sun_fdops.fd_eject = sun_pci_fd_eject;
637
638		fdc_status = (unsigned long) &sun_fdc->status_82077;
639
640		/*
641		 * XXX: Find out on which machines this is really needed.
642		 */
643		if (1) {
644			sun_pci_broken_drive = 1;
645			sun_fdops.fd_outb = sun_pci_fd_broken_outb;
646		}
647
648		allowed_drive_mask = 0;
649		if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 0))
650			sun_floppy_types[0] = 4;
651		if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 1))
652			sun_floppy_types[1] = 4;
653
654		/*
655		 * Find NS87303 SuperIO config registers (through ecpp).
656		 */
657		config = 0;
658		for (dp = ebus_dp->child; dp; dp = dp->sibling) {
659			if (!strcmp(dp->name, "ecpp")) {
660				struct platform_device *ecpp_op;
661
662				ecpp_op = of_find_device_by_node(dp);
663				if (ecpp_op)
664					config = ecpp_op->resource[1].start;
665				goto config_done;
666			}
667		}
668	config_done:
669
670		/*
671		 * Sanity check, is this really the NS87303?
672		 */
673		switch (config & 0x3ff) {
674		case 0x02e:
675		case 0x15c:
676		case 0x26e:
677		case 0x398:
678			break;
679		default:
680			config = 0;
681		}
682
683		if (!config)
684			return sun_floppy_types[0];
685
686		/* Enable PC-AT mode. */
687		ns87303_modify(config, ASC, 0, 0xc0);
688
689#ifdef PCI_FDC_SWAP_DRIVES
690		/*
691		 * If only Floppy 1 is present, swap drives.
692		 */
693		if (!sun_floppy_types[0] && sun_floppy_types[1]) {
694			/*
695			 * Set the drive exchange bit in FCR on NS87303,
696			 * make sure other bits are sane before doing so.
697			 */
698			ns87303_modify(config, FER, FER_EDM, 0);
699			ns87303_modify(config, ASC, ASC_DRV2_SEL, 0);
700			ns87303_modify(config, FCR, 0, FCR_LDE);
701
702			config = sun_floppy_types[0];
703			sun_floppy_types[0] = sun_floppy_types[1];
704			sun_floppy_types[1] = config;
705
706			if (sun_pci_broken_drive != -1) {
707				sun_pci_broken_drive = 1 - sun_pci_broken_drive;
708				sun_fdops.fd_outb = sun_pci_fd_lde_broken_outb;
709			}
710		}
711#endif /* PCI_FDC_SWAP_DRIVES */
712
713		return sun_floppy_types[0];
714	}
715	prop = of_get_property(op->dev.of_node, "status", NULL);
716	if (prop && !strncmp(state, "disabled", 8))
717		return 0;
718
719	/*
720	 * We cannot do of_ioremap here: it does request_region,
721	 * which the generic floppy driver tries to do once again.
722	 * But we must use the sdev resource values as they have
723	 * had parent ranges applied.
724	 */
725	sun_fdc = (struct sun_flpy_controller *)
726		(op->resource[0].start +
727		 ((op->resource[0].flags & 0x1ffUL) << 32UL));
728
729	/* Last minute sanity check... */
730	if (sbus_readb(&sun_fdc->status1_82077) == 0xff) {
731		sun_fdc = (struct sun_flpy_controller *)-1;
732		return 0;
733	}
734
735        sun_fdops.fd_inb = sun_82077_fd_inb;
736        sun_fdops.fd_outb = sun_82077_fd_outb;
737
738	can_use_virtual_dma = use_virtual_dma = 1;
739	sun_fdops.fd_enable_dma = sun_fd_enable_dma;
740	sun_fdops.fd_disable_dma = sun_fd_disable_dma;
741	sun_fdops.fd_set_dma_mode = sun_fd_set_dma_mode;
742	sun_fdops.fd_set_dma_addr = sun_fd_set_dma_addr;
743	sun_fdops.fd_set_dma_count = sun_fd_set_dma_count;
744	sun_fdops.get_dma_residue = sun_get_dma_residue;
745
746	sun_fdops.fd_request_irq = sun_fd_request_irq;
747	sun_fdops.fd_free_irq = sun_fd_free_irq;
748
749	sun_fdops.fd_eject = sun_fd_eject;
750
751        fdc_status = (unsigned long) &sun_fdc->status_82077;
752
753	/* Success... */
754	allowed_drive_mask = 0x01;
755	sun_floppy_types[0] = 4;
756	sun_floppy_types[1] = 0;
757
758	return sun_floppy_types[0];
759}
760
761#define EXTRA_FLOPPY_PARAMS
762
763static DEFINE_SPINLOCK(dma_spin_lock);
764
765#define claim_dma_lock() \
766({	unsigned long flags; \
767	spin_lock_irqsave(&dma_spin_lock, flags); \
768	flags; \
769})
770
771#define release_dma_lock(__flags) \
772	spin_unlock_irqrestore(&dma_spin_lock, __flags);
773
774#endif /* !(__ASM_SPARC64_FLOPPY_H) */
775