arch/sparc/include/asm/floppy_32.h - arm/linux-arm64-legacy - Git at Google

 /* asm/floppy.h: Sparc specific parts of the Floppy driver.
  *
  * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
  */

 #ifndef __ASM_SPARC_FLOPPY_H
 #define __ASM_SPARC_FLOPPY_H

 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/system.h>
 #include <asm/idprom.h>
 #include <asm/machines.h>
 #include <asm/oplib.h>
 #include <asm/auxio.h>
 #include <asm/irq.h>

 /* We don't need no stinkin' I/O port allocation crap. */
 #undef release_region
 #undef request_region
 #define release_region(X, Y)	do { } while(0)
 #define request_region(X, Y, Z)	(1)

 /* References:
  * 1) Netbsd Sun floppy driver.
  * 2) NCR 82077 controller manual
  * 3) Intel 82077 controller manual
  */
 struct sun_flpy_controller {
 	volatile unsigned char status_82072;  /* Main Status reg. */
 #define dcr_82072              status_82072   /* Digital Control reg. */
 #define status1_82077          status_82072   /* Auxiliary Status reg. 1 */

 	volatile unsigned char data_82072;    /* Data fifo. */
 #define status2_82077          data_82072     /* Auxiliary Status reg. 2 */

 	volatile unsigned char dor_82077;     /* Digital Output reg. */
 	volatile unsigned char tapectl_82077; /* What the? 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 a SparcStation anyways. */
 static struct sun_flpy_controller *sun_fdc = NULL;
 extern volatile unsigned char *fdc_status;

 struct sun_floppy_ops {
 	unsigned char (*fd_inb)(int port);
 	void (*fd_outb)(unsigned char value, int port);
 };

 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_fd_enable_dma()
 #define fd_disable_dma()          sun_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_fd_set_dma_mode(mode)
 #define fd_set_dma_addr(addr)     sun_fd_set_dma_addr(addr)
 #define fd_set_dma_count(count)   sun_fd_set_dma_count(count)
 #define fd_enable_irq()           /* nothing... */
 #define fd_disable_irq()          /* nothing... */
 #define fd_cacheflush(addr, size) /* nothing... */
 #define fd_request_irq()          sun_fd_request_irq()
 #define fd_free_irq()             /* nothing... */
 #if 0  /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
 #define fd_dma_mem_alloc(size)    ((unsigned long) vmalloc(size))
 #define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
 #endif

 /* XXX This isn't really correct. XXX */
 #define get_dma_residue(x)        (0)

 #define FLOPPY0_TYPE  4
 #define FLOPPY1_TYPE  0

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

 /* 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 FDC1                      sun_floppy_init()

 #define N_FDC    1
 #define N_DRIVE  8

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

 /* Routines unique to each controller type on a Sun. */
 static void sun_set_dor(unsigned char value, int fdc_82077)
 {
 	if (sparc_cpu_model == sun4c) {
 		unsigned int bits = 0;
 		if (value & 0x10)
 			bits |= AUXIO_FLPY_DSEL;
 		if ((value & 0x80) == 0)
 			bits |= AUXIO_FLPY_EJCT;
 		set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT));
 	}
 	if (fdc_82077) {
 		sun_fdc->dor_82077 = value;
 	}
 }

 static unsigned char sun_read_dir(void)
 {
 	if (sparc_cpu_model == sun4c)
 		return (get_auxio() & AUXIO_FLPY_DCHG) ? 0x80 : 0;
 	else
 		return sun_fdc->dir_82077;
 }

 static unsigned char sun_82072_fd_inb(int port)
 {
 	udelay(5);
 	switch(port & 7) {
 	default:
 		printk("floppy: Asked to read unknown port %d\n", port);
 		panic("floppy: Port bolixed.");
 	case 4: /* FD_STATUS */
 		return sun_fdc->status_82072 & ~STATUS_DMA;
 	case 5: /* FD_DATA */
 		return sun_fdc->data_82072;
 	case 7: /* FD_DIR */
 		return sun_read_dir();
 	};
 	panic("sun_82072_fd_inb: How did I get here?");
 }

 static void sun_82072_fd_outb(unsigned char value, int port)
 {
 	udelay(5);
 	switch(port & 7) {
 	default:
 		printk("floppy: Asked to write to unknown port %d\n", port);
 		panic("floppy: Port bolixed.");
 	case 2: /* FD_DOR */
 		sun_set_dor(value, 0);
 		break;
 	case 5: /* FD_DATA */
 		sun_fdc->data_82072 = value;
 		break;
 	case 7: /* FD_DCR */
 		sun_fdc->dcr_82072 = value;
 		break;
 	case 4: /* FD_STATUS */
 		sun_fdc->status_82072 = value;
 		break;
 	};
 	return;
 }

 static unsigned char sun_82077_fd_inb(int port)
 {
 	udelay(5);
 	switch(port & 7) {
 	default:
 		printk("floppy: Asked to read unknown port %d\n", port);
 		panic("floppy: Port bolixed.");
 	case 0: /* FD_STATUS_0 */
 		return sun_fdc->status1_82077;
 	case 1: /* FD_STATUS_1 */
 		return sun_fdc->status2_82077;
 	case 2: /* FD_DOR */
 		return sun_fdc->dor_82077;
 	case 3: /* FD_TDR */
 		return sun_fdc->tapectl_82077;
 	case 4: /* FD_STATUS */
 		return sun_fdc->status_82077 & ~STATUS_DMA;
 	case 5: /* FD_DATA */
 		return sun_fdc->data_82077;
 	case 7: /* FD_DIR */
 		return sun_read_dir();
 	};
 	panic("sun_82077_fd_inb: How did I get here?");
 }

 static void sun_82077_fd_outb(unsigned char value, int port)
 {
 	udelay(5);
 	switch(port & 7) {
 	default:
 		printk("floppy: Asked to write to unknown port %d\n", port);
 		panic("floppy: Port bolixed.");
 	case 2: /* FD_DOR */
 		sun_set_dor(value, 1);
 		break;
 	case 5: /* FD_DATA */
 		sun_fdc->data_82077 = value;
 		break;
 	case 7: /* FD_DCR */
 		sun_fdc->dcr_82077 = value;
 		break;
 	case 4: /* FD_STATUS */
 		sun_fdc->status_82077 = value;
 		break;
 	case 3: /* FD_TDR */
 		sun_fdc->tapectl_82077 = value;
 		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
  */
 extern char *pdma_vaddr;
 extern unsigned long pdma_size;
 extern volatile int doing_pdma;

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

 /* Common routines to all controller types on the Sparc. */
 static inline void virtual_dma_init(void)
 {
 	/* nothing... */
 }

 static inline void sun_fd_disable_dma(void)
 {
 	doing_pdma = 0;
 	if (pdma_base) {
 		mmu_unlockarea(pdma_base, pdma_areasize);
 		pdma_base = NULL;
 	}
 }

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

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

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

 /* Our low-level entry point in arch/sparc/kernel/entry.S */
 extern int sparc_floppy_request_irq(int irq, unsigned long flags,
 				    irq_handler_t irq_handler);

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

 	if(!once) {
 		once = 1;
 		error = sparc_floppy_request_irq(FLOPPY_IRQ,
 						 IRQF_DISABLED,
 						 floppy_interrupt);
 		return ((error == 0) ? 0 : -1);
 	} else return 0;
 }

 static struct linux_prom_registers fd_regs[2];

 static int sun_floppy_init(void)
 {
 	char state[128];
 	int tnode, fd_node, num_regs;
 	struct resource r;

 	use_virtual_dma = 1;

 	FLOPPY_IRQ = 11;
 	/* Forget it if we aren't on a machine that could possibly
 	 * ever have a floppy drive.
 	 */
 	if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) ||
 	   ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
 	    (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
 		/* We certainly don't have a floppy controller. */
 		goto no_sun_fdc;
 	}
 	/* Well, try to find one. */
 	tnode = prom_getchild(prom_root_node);
 	fd_node = prom_searchsiblings(tnode, "obio");
 	if(fd_node != 0) {
 		tnode = prom_getchild(fd_node);
 		fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
 	} else {
 		fd_node = prom_searchsiblings(tnode, "fd");
 	}
 	if(fd_node == 0) {
 		goto no_sun_fdc;
 	}

 	/* The sun4m lets us know if the controller is actually usable. */
 	if(sparc_cpu_model == sun4m &&
 	   prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
 		if(!strcmp(state, "disabled")) {
 			goto no_sun_fdc;
 		}
 	}
 	num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
 	num_regs = (num_regs / sizeof(fd_regs[0]));
 	prom_apply_obio_ranges(fd_regs, num_regs);
 	memset(&r, 0, sizeof(r));
 	r.flags = fd_regs[0].which_io;
 	r.start = fd_regs[0].phys_addr;
 	sun_fdc = (struct sun_flpy_controller *)
 	    sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");

 	/* Last minute sanity check... */
 	if(sun_fdc->status_82072 == 0xff) {
 		sun_fdc = NULL;
 		goto no_sun_fdc;
 	}

 	sun_fdops.fd_inb = sun_82077_fd_inb;
 	sun_fdops.fd_outb = sun_82077_fd_outb;
 	fdc_status = &sun_fdc->status_82077;

 	if (sun_fdc->dor_82077 == 0x80) {
 		sun_fdc->dor_82077 = 0x02;
 		if (sun_fdc->dor_82077 == 0x80) {
 			sun_fdops.fd_inb = sun_82072_fd_inb;
 			sun_fdops.fd_outb = sun_82072_fd_outb;
 			fdc_status = &sun_fdc->status_82072;
 		}
 	}

 	/* Success... */
 	allowed_drive_mask = 0x01;
 	return (int) sun_fdc;

 no_sun_fdc:
 	return -1;
 }

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

 #define fd_eject(drive) sparc_eject()

 #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_SPARC_FLOPPY_H) */
	/* asm/floppy.h: Sparc specific parts of the Floppy driver.
	*
	* Copyright (C) 1995 David S. Miller (davem@davemloft.net)
	*/

	#ifndef __ASM_SPARC_FLOPPY_H
	#define __ASM_SPARC_FLOPPY_H

	#include <asm/page.h>
	#include <asm/pgtable.h>
	#include <asm/system.h>
	#include <asm/idprom.h>
	#include <asm/machines.h>
	#include <asm/oplib.h>
	#include <asm/auxio.h>
	#include <asm/irq.h>

	/* We don't need no stinkin' I/O port allocation crap. */
	#undef release_region
	#undef request_region
	#define release_region(X, Y) do { } while(0)
	#define request_region(X, Y, Z) (1)

	/* References:
	* 1) Netbsd Sun floppy driver.
	* 2) NCR 82077 controller manual
	* 3) Intel 82077 controller manual
	*/
	struct sun_flpy_controller {
	volatile unsigned char status_82072; /* Main Status reg. */
	#define dcr_82072 status_82072 /* Digital Control reg. */
	#define status1_82077 status_82072 /* Auxiliary Status reg. 1 */

	volatile unsigned char data_82072; /* Data fifo. */
	#define status2_82077 data_82072 /* Auxiliary Status reg. 2 */

	volatile unsigned char dor_82077; /* Digital Output reg. */
	volatile unsigned char tapectl_82077; /* What the? 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 a SparcStation anyways. */
	static struct sun_flpy_controller *sun_fdc = NULL;
	extern volatile unsigned char *fdc_status;

	struct sun_floppy_ops {
	unsigned char (*fd_inb)(int port);
	void (*fd_outb)(unsigned char value, int port);
	};

	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_fd_enable_dma()
	#define fd_disable_dma() sun_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_fd_set_dma_mode(mode)
	#define fd_set_dma_addr(addr) sun_fd_set_dma_addr(addr)
	#define fd_set_dma_count(count) sun_fd_set_dma_count(count)
	#define fd_enable_irq() /* nothing... */
	#define fd_disable_irq() /* nothing... */
	#define fd_cacheflush(addr, size) /* nothing... */
	#define fd_request_irq() sun_fd_request_irq()
	#define fd_free_irq() /* nothing... */
	#if 0 /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
	#define fd_dma_mem_alloc(size) ((unsigned long) vmalloc(size))
	#define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
	#endif

	/* XXX This isn't really correct. XXX */
	#define get_dma_residue(x) (0)

	#define FLOPPY0_TYPE 4
	#define FLOPPY1_TYPE 0

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

	/* 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 FDC1 sun_floppy_init()

	#define N_FDC 1
	#define N_DRIVE 8

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

	/* Routines unique to each controller type on a Sun. */
	static void sun_set_dor(unsigned char value, int fdc_82077)
	{
	if (sparc_cpu_model == sun4c) {
	unsigned int bits = 0;
	if (value & 0x10)
	bits \|= AUXIO_FLPY_DSEL;
	if ((value & 0x80) == 0)
	bits \|= AUXIO_FLPY_EJCT;
	set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL\|AUXIO_FLPY_EJCT));
	}
	if (fdc_82077) {
	sun_fdc->dor_82077 = value;
	}
	}

	static unsigned char sun_read_dir(void)
	{
	if (sparc_cpu_model == sun4c)
	return (get_auxio() & AUXIO_FLPY_DCHG) ? 0x80 : 0;
	else
	return sun_fdc->dir_82077;
	}

	static unsigned char sun_82072_fd_inb(int port)
	{
	udelay(5);
	switch(port & 7) {
	default:
	printk("floppy: Asked to read unknown port %d\n", port);
	panic("floppy: Port bolixed.");
	case 4: /* FD_STATUS */
	return sun_fdc->status_82072 & ~STATUS_DMA;
	case 5: /* FD_DATA */
	return sun_fdc->data_82072;
	case 7: /* FD_DIR */
	return sun_read_dir();
	};
	panic("sun_82072_fd_inb: How did I get here?");
	}

	static void sun_82072_fd_outb(unsigned char value, int port)
	{
	udelay(5);
	switch(port & 7) {
	default:
	printk("floppy: Asked to write to unknown port %d\n", port);
	panic("floppy: Port bolixed.");
	case 2: /* FD_DOR */
	sun_set_dor(value, 0);
	break;
	case 5: /* FD_DATA */
	sun_fdc->data_82072 = value;
	break;
	case 7: /* FD_DCR */
	sun_fdc->dcr_82072 = value;
	break;
	case 4: /* FD_STATUS */
	sun_fdc->status_82072 = value;
	break;
	};
	return;
	}

	static unsigned char sun_82077_fd_inb(int port)
	{
	udelay(5);
	switch(port & 7) {
	default:
	printk("floppy: Asked to read unknown port %d\n", port);
	panic("floppy: Port bolixed.");
	case 0: /* FD_STATUS_0 */
	return sun_fdc->status1_82077;
	case 1: /* FD_STATUS_1 */
	return sun_fdc->status2_82077;
	case 2: /* FD_DOR */
	return sun_fdc->dor_82077;
	case 3: /* FD_TDR */
	return sun_fdc->tapectl_82077;
	case 4: /* FD_STATUS */
	return sun_fdc->status_82077 & ~STATUS_DMA;
	case 5: /* FD_DATA */
	return sun_fdc->data_82077;
	case 7: /* FD_DIR */
	return sun_read_dir();
	};
	panic("sun_82077_fd_inb: How did I get here?");
	}

	static void sun_82077_fd_outb(unsigned char value, int port)
	{
	udelay(5);
	switch(port & 7) {
	default:
	printk("floppy: Asked to write to unknown port %d\n", port);
	panic("floppy: Port bolixed.");
	case 2: /* FD_DOR */
	sun_set_dor(value, 1);
	break;
	case 5: /* FD_DATA */
	sun_fdc->data_82077 = value;
	break;
	case 7: /* FD_DCR */
	sun_fdc->dcr_82077 = value;
	break;
	case 4: /* FD_STATUS */
	sun_fdc->status_82077 = value;
	break;
	case 3: /* FD_TDR */
	sun_fdc->tapectl_82077 = value;
	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
	*/
	extern char *pdma_vaddr;
	extern unsigned long pdma_size;
	extern volatile int doing_pdma;

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

	/* Common routines to all controller types on the Sparc. */
	static inline void virtual_dma_init(void)
	{
	/* nothing... */
	}

	static inline void sun_fd_disable_dma(void)
	{
	doing_pdma = 0;
	if (pdma_base) {
	mmu_unlockarea(pdma_base, pdma_areasize);
	pdma_base = NULL;
	}
	}

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

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

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

	/* Our low-level entry point in arch/sparc/kernel/entry.S */
	extern int sparc_floppy_request_irq(int irq, unsigned long flags,
	irq_handler_t irq_handler);

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

	if(!once) {
	once = 1;
	error = sparc_floppy_request_irq(FLOPPY_IRQ,
	IRQF_DISABLED,
	floppy_interrupt);
	return ((error == 0) ? 0 : -1);
	} else return 0;
	}

	static struct linux_prom_registers fd_regs[2];

	static int sun_floppy_init(void)
	{
	char state[128];
	int tnode, fd_node, num_regs;
	struct resource r;

	use_virtual_dma = 1;

	FLOPPY_IRQ = 11;
	/* Forget it if we aren't on a machine that could possibly
	* ever have a floppy drive.
	*/
	if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) \|\|
	((idprom->id_machtype == (SM_SUN4C \| SM_4C_SLC)) \|\|
	(idprom->id_machtype == (SM_SUN4C \| SM_4C_ELC)))) {
	/* We certainly don't have a floppy controller. */
	goto no_sun_fdc;
	}
	/* Well, try to find one. */
	tnode = prom_getchild(prom_root_node);
	fd_node = prom_searchsiblings(tnode, "obio");
	if(fd_node != 0) {
	tnode = prom_getchild(fd_node);
	fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
	} else {
	fd_node = prom_searchsiblings(tnode, "fd");
	}
	if(fd_node == 0) {
	goto no_sun_fdc;
	}

	/* The sun4m lets us know if the controller is actually usable. */
	if(sparc_cpu_model == sun4m &&
	prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
	if(!strcmp(state, "disabled")) {
	goto no_sun_fdc;
	}
	}
	num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
	num_regs = (num_regs / sizeof(fd_regs[0]));
	prom_apply_obio_ranges(fd_regs, num_regs);
	memset(&r, 0, sizeof(r));
	r.flags = fd_regs[0].which_io;
	r.start = fd_regs[0].phys_addr;
	sun_fdc = (struct sun_flpy_controller *)
	sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");

	/* Last minute sanity check... */
	if(sun_fdc->status_82072 == 0xff) {
	sun_fdc = NULL;
	goto no_sun_fdc;
	}

	sun_fdops.fd_inb = sun_82077_fd_inb;
	sun_fdops.fd_outb = sun_82077_fd_outb;
	fdc_status = &sun_fdc->status_82077;

	if (sun_fdc->dor_82077 == 0x80) {
	sun_fdc->dor_82077 = 0x02;
	if (sun_fdc->dor_82077 == 0x80) {
	sun_fdops.fd_inb = sun_82072_fd_inb;
	sun_fdops.fd_outb = sun_82072_fd_outb;
	fdc_status = &sun_fdc->status_82072;
	}
	}

	/* Success... */
	allowed_drive_mask = 0x01;
	return (int) sun_fdc;

	no_sun_fdc:
	return -1;
	}

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

	#define fd_eject(drive) sparc_eject()

	#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_SPARC_FLOPPY_H) */