text: /* $Id: floppy.h,v 1.1.1.4 2003/10/14 08:09:23 sparq Exp $
   * asm-sparc64/floppy.h: Sparc specific parts of the Floppy driver.
   *
   * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   * 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/config.h>
  #include <linux/init.h>
  
  #include <asm/page.h>
  #include <asm/pgtable.h>
  #include <asm/system.h>
  #include <asm/idprom.h>
  #include <asm/oplib.h>
  #include <asm/auxio.h>
  #include <asm/sbus.h>
  #include <asm/irq.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 sbus_dev *floppy_sdev = 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);
  	void		(*fd_enable_irq) (void);
  	void		(*fd_disable_irq) (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_enable_irq()           sun_fdops.fd_enable_irq()
  #define fd_disable_irq()          sun_fdops.fd_disable_irq()
  #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)
  
  static int FLOPPY_MOTOR_MASK = 0x10;
  
  /* 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 */
  		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
   */
  char *pdma_vaddr;
  unsigned long pdma_size;
  volatile int doing_pdma = 0;
  
  /* This is software state */
  char *pdma_base = 0;
  unsigned long pdma_areasize;
  
  /* Common routines to all controller types on the Sparc. */
  static void sun_fd_disable_dma(void)
  {
  	doing_pdma = 0;
  	if (pdma_base) {
  		mmu_unlockarea(pdma_base, pdma_areasize);
  		pdma_base = 0;
  	}
  }
  
  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_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 void floppy_hardint(int irq, void *unused, struct pt_regs *regs);
  
  static int sun_fd_request_irq(void)
  {
  	static int once = 0;
  	int error;
  
  	if(!once) {
  		once = 1;
  
  		error = request_fast_irq(FLOPPY_IRQ, floppy_hardint, 
  					 SA_INTERRUPT, "floppy", NULL);
  
  		return ((error == 0) ? 0 : -1);
  	}
  	return 0;
  }
  
  static void sun_fd_enable_irq(void)
  {
  }
  
  static void sun_fd_disable_irq(void)
  {
  }
  
  static void sun_fd_free_irq(void)
  {
  }
  
  static unsigned int sun_get_dma_residue(void)
  {
  	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;
  }
  
  #ifdef CONFIG_PCI
  #include <asm/ebus.h>
  #include <asm/isa.h>
  #include <asm/ns87303.h>
  
  static struct linux_ebus_dma *sun_pci_fd_ebus_dma;
  static struct pci_dev *sun_pci_ebus_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 void floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  
  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);
  	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);
  	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_reset_dma(void)
  {
  	unsigned int dcsr;
  
  	writel(EBUS_DCSR_RESET, &sun_pci_fd_ebus_dma->dcsr);
  	udelay(1);
  	dcsr = EBUS_DCSR_BURST_SZ_16 | EBUS_DCSR_TCI_DIS |
  	       EBUS_DCSR_EN_CNT;
  	writel(dcsr, (unsigned long)&sun_pci_fd_ebus_dma->dcsr);
  }
  
  static void sun_pci_fd_enable_dma(void)
  {
  	unsigned int dcsr;
  
  	if((NULL == sun_pci_dma_pending.buf) 	||
  	   (0	== sun_pci_dma_pending.len) 	||
  	   (0	== sun_pci_dma_pending.direction)) {
  		goto enable; /* TODO: BUG() */
  	}
  
  	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 = 
  		pci_map_single(	sun_pci_ebus_dev,
  				sun_pci_dma_current.buf,
  				sun_pci_dma_current.len,
  				sun_pci_dma_current.direction);
  	writel(sun_pci_dma_current.addr, &sun_pci_fd_ebus_dma->dacr);
  
  enable:
  	dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
  	dcsr |= EBUS_DCSR_EN_DMA;
  	writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
  }
  
  static void sun_pci_fd_disable_dma(void)
  {
  	unsigned int dcsr;
  
  	dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
  	if (dcsr & EBUS_DCSR_EN_DMA) {
  		while (dcsr & EBUS_DCSR_DRAIN) {
  			udelay(1);
  			dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
  		}
  		dcsr &= ~(EBUS_DCSR_EN_DMA);
  		writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
  		if (dcsr & EBUS_DCSR_ERR_PEND) {
  			sun_pci_fd_reset_dma();
  			dcsr &= ~(EBUS_DCSR_ERR_PEND);
  			writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
  		}
  	}
  	if (sun_pci_dma_current.addr != -1U)
  		pci_unmap_single(sun_pci_ebus_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)
  {
  	unsigned int dcsr;
  
  	dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
  	if (readl(&sun_pci_fd_ebus_dma->dbcr)) {
  		sun_pci_fd_reset_dma();
  		writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
  	}
  
  	dcsr |= EBUS_DCSR_EN_CNT | EBUS_DCSR_TC;
  	/*
  	 * For EBus WRITE means to system memory, which is
  	 * READ for us.
  	 */
  	if (mode == DMA_MODE_WRITE) {
  		dcsr &= ~(EBUS_DCSR_WRITE);
  		sun_pci_dma_pending.direction = PCI_DMA_TODEVICE;
  	} else {
  		dcsr |= EBUS_DCSR_WRITE;
  		sun_pci_dma_pending.direction = PCI_DMA_FROMDEVICE;
  	}
  	writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
  }
  
  static void sun_pci_fd_set_dma_count(int length)
  {
  	sun_pci_dma_pending.len = length;
  	writel(length, &sun_pci_fd_ebus_dma->dbcr);
  }
  
  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)
  {
  	unsigned int dcsr, res;
  
  	res = readl(&sun_pci_fd_ebus_dma->dbcr);
  	if (res != 0) {
  		dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
  		sun_pci_fd_reset_dma();
  		writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
  	}
  	return res;
  }
  
  static void sun_pci_fd_enable_irq(void)
  {
  	unsigned int dcsr;
  
  	dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
  	dcsr |= EBUS_DCSR_INT_EN;
  	writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
  }
  
  static void sun_pci_fd_disable_irq(void)
  {
  	unsigned int dcsr;
  
  	dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
  	dcsr &= ~(EBUS_DCSR_INT_EN);
  	writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
  }
  
  static int sun_pci_fd_request_irq(void)
  {
  	int err;
  
  	err = request_irq(FLOPPY_IRQ, floppy_interrupt, SA_SHIRQ,
  			  "floppy", sun_fdc);
  	if (err)
  		return -1;
  	sun_pci_fd_enable_irq();
  	return 0;
  }
  
  static void sun_pci_fd_free_irq(void)
  {
  	sun_pci_fd_disable_irq();
  	free_irq(FLOPPY_IRQ, sun_fdc);
  }
  
  static int sun_pci_fd_eject(int drive)
  {
  	return -EINVAL;
  }
  
  
  /*
   * 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
  
  #endif /* CONFIG_PCI */
  
  #ifdef CONFIG_PCI
  static int __init ebus_fdthree_p(struct linux_ebus_device *edev)
  {
  	if (!strcmp(edev->prom_name, "fdthree"))
  		return 1;
  	if (!strcmp(edev->prom_name, "floppy")) {
  		char compat[16];
  		prom_getstring(edev->prom_node,
  			       "compatible",
  			       compat, sizeof(compat));
  		compat[15] = '\0';
  		if (!strcmp(compat, "fdthree"))
  			return 1;
  	}
  	return 0;
  }
  #endif
  
  #ifdef CONFIG_PCI
  #undef ISA_FLOPPY_WORKS
  
  #ifdef ISA_FLOPPY_WORKS
  static unsigned long __init isa_floppy_init(void)
  {
  	struct isa_bridge *isa_br;
  	struct isa_device *isa_dev = NULL;
  
  	for_each_isa(isa_br) {
  		for_each_isadev(isa_dev, isa_br) {
  			if (!strcmp(isa_dev->prom_name, "dma")) {
  				struct isa_device *child = isa_dev->child;
  
  				while (child) {
  					if (!strcmp(child->prom_name, "floppy")) {
  						isa_dev = child;
  						goto isa_done;
  					}
  					child = child->next;
  				}
  			}
  		}
  	}
  isa_done:
  	if (!isa_dev)
  		return 0;
  
  	/* We could use DMA on devices behind the ISA bridge, but...
  	 *
  	 * There is a slight problem.  Normally on x86 kit the x86 processor
  	 * delays I/O port instructions when the ISA bus "dma in progress"
  	 * signal is active.  Well, sparc64 systems do not monitor this
  	 * signal thus we would need to block all I/O port accesses in software
  	 * when a dma transfer is active for some device.
  	 */
  
  	sun_fdc = (struct sun_flpy_controller *)isa_dev->resource.start;
  	FLOPPY_IRQ = isa_dev->irq;
  
  	sun_fdops.fd_inb = sun_pci_fd_inb;
  	sun_fdops.fd_outb = sun_pci_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_enable_irq = sun_fd_enable_irq;
  	sun_fdops.fd_disable_irq = sun_fd_disable_irq;
  	sun_fdops.fd_request_irq = sun_fd_request_irq;
  	sun_fdops.fd_free_irq = sun_fd_free_irq;
  
  	/* Floppy eject is manual.   Actually, could determine this
  	 * via presence of 'manual' property in OBP node.
  	 */
  	sun_fdops.fd_eject = sun_pci_fd_eject;
  
          fdc_status = (unsigned long) &sun_fdc->status_82077;
  	FLOPPY_MOTOR_MASK = 0xf0;
  
  	allowed_drive_mask = 0;
  	sun_floppy_types[0] = 0;
  	sun_floppy_types[1] = 4;
  
  	sun_pci_broken_drive = 1;
  	sun_fdops.fd_outb = sun_pci_fd_broken_outb;
  
  	return sun_floppy_types[0];
  }
  #endif /* ISA_FLOPPY_WORKS */
  
  #endif
  
  static unsigned long __init sun_floppy_init(void)
  {
  	char state[128];
  	struct sbus_bus *bus;
  	struct sbus_dev *sdev = NULL;
  	static int initialized = 0;
  
  	if (initialized)
  		return sun_floppy_types[0];
  	initialized = 1;
  
  	for_all_sbusdev (sdev, bus) {
  		if (!strcmp(sdev->prom_name, "SUNW,fdtwo")) 
  			break;
  	}
  	if(sdev) {
  		floppy_sdev = sdev;
  		FLOPPY_IRQ = sdev->irqs[0];
  	} else {
  #ifdef CONFIG_PCI
  		struct linux_ebus *ebus;
  		struct linux_ebus_device *edev = 0;
  		unsigned long config = 0;
  		unsigned long auxio_reg;
  
  		for_each_ebus(ebus) {
  			for_each_ebusdev(edev, ebus) {
  				if (ebus_fdthree_p(edev))
  					goto ebus_done;
  			}
  		}
  	ebus_done:
  		if (!edev) {
  #ifdef ISA_FLOPPY_WORKS
  			return isa_floppy_init();
  #else
  			return 0;
  #endif
  		}
  
  		prom_getproperty(edev->prom_node, "status",
  				 state, sizeof(state));
  		if(!strncmp(state, "disabled", 8))
  			return 0;
  			
  		sun_fdc = (struct sun_flpy_controller *)edev->resource[0].start;
  		FLOPPY_IRQ = edev->irqs[0];
  
  		/* Make sure the high density bit is set, some systems
  		 * (most notably Ultra5/Ultra10) come up with it clear.
  		 */
  		auxio_reg = edev->resource[2].start;
  		writel(readl(auxio_reg)|0x2, auxio_reg);
  
  		sun_pci_ebus_dev = ebus->self;
  
  		sun_pci_fd_ebus_dma = (struct linux_ebus_dma *)
  			edev->resource[1].start;
  		sun_pci_fd_reset_dma();
  
  		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_enable_irq = sun_pci_fd_enable_irq;
  		sun_fdops.fd_disable_irq = sun_pci_fd_disable_irq;
  		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;
  		FLOPPY_MOTOR_MASK = 0xf0;
  
  		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).
  		 */
  		for_each_ebus(ebus) {
  			for_each_ebusdev(edev, ebus) {
  				if (!strcmp(edev->prom_name, "ecpp")) {
  					config = edev->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 shure 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];
  #else
  		return 0;
  #endif
  	}
  	prom_getproperty(sdev->prom_node, "status", state, sizeof(state));
  	if(!strncmp(state, "disabled", 8))
  		return 0;
  
  	/*
  	 * We cannot do sbus_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 *)
  		(sdev->resource[0].start +
  		 ((sdev->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_enable_irq = sun_fd_enable_irq;
  	sun_fdops.fd_disable_irq = sun_fd_disable_irq;
  	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
  
  #endif /* !(__ASM_SPARC64_FLOPPY_H) */
  