sync hh.org

[hh.org.git] / include / asm-sparc64 / floppy.h

/* $Id: floppy.h,v 1.32 2001/10/26 17:59:36 davem 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/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);
        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)

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 */
                /* 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;
        if (pdma_base) {
                mmu_unlockarea(pdma_base, pdma_areasize);
                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_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
        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;
}

#ifdef CONFIG_PCI
#include <asm/ebus.h>
#include <asm/isa.h>
#include <asm/ns87303.h>

static struct ebus_dma_info 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 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 = 
                pci_map_single(sun_pci_ebus_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)
                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)
{
        if (mode == DMA_MODE_WRITE)
                sun_pci_dma_pending.direction = PCI_DMA_TODEVICE;
        else
                sun_pci_dma_pending.direction = PCI_DMA_FROMDEVICE;

        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

#endif /* CONFIG_PCI */

#ifdef CONFIG_PCI
static int __init ebus_fdthree_p(struct linux_ebus_device *edev)
{
        if (!strcmp(edev->prom_node->name, "fdthree"))
                return 1;
        if (!strcmp(edev->prom_node->name, "floppy")) {
                char *compat;

                compat = of_get_property(edev->prom_node,
                                         "compatible", NULL);
                if (compat && !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 sparc_isa_bridge *isa_br;
        struct sparc_isa_device *isa_dev = NULL;

        for_each_isa(isa_br) {
                for_each_isadev(isa_dev, isa_br) {
                        if (!strcmp(isa_dev->prom_node->name, "dma")) {
                                struct sparc_isa_device *child =
                                        isa_dev->child;

                                while (child) {
                                        if (!strcmp(child->prom_node->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_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 = NULL;
                unsigned long config = 0;
                void __iomem *auxio_reg;
                char *state_prop;

                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
                }

                state_prop = of_get_property(edev->prom_node, "status", NULL);
                if (state_prop && !strncmp(state_prop, "disabled", 8))
                        return 0;
                        
                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 = (void __iomem *) edev->resource[2].start;
                writel(readl(auxio_reg)|0x2, auxio_reg);

                sun_pci_ebus_dev = ebus->self;

                spin_lock_init(&sun_pci_fd_ebus_dma.lock);

                /* XXX ioremap */
                sun_pci_fd_ebus_dma.regs = (void __iomem *)
                        edev->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 *)edev->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;
                FLOPPY_MOTOR_MASK = 0xf0;

                /*
                 * 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).
                 */
                for_each_ebus(ebus) {
                        for_each_ebusdev(edev, ebus) {
                                if (!strcmp(edev->prom_node->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 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];
#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_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) */