sun3xflop.h

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/* sun3xflop.h: Sun3/80 specific parts of the floppy driver.
 *
 * Derived partially from asm-sparc/floppy.h, which is:
 *     Copyright (C) 1995 David S. Miller ([email protected])
 *
 * Sun3x version 2/4/2000 Sam Creasey ([email protected])
 */

#ifndef __ASM_SUN3X_FLOPPY_H
#define __ASM_SUN3X_FLOPPY_H

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/sun3x.h>

/* default interrupt vector */
#define SUN3X_FDC_IRQ 0x40

/* some constants */
#define FCR_TC 0x1
#define FCR_EJECT 0x2
#define FCR_MTRON 0x4
#define FCR_DSEL1 0x8
#define FCR_DSEL0 0x10

/* 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)

struct sun3xflop_private {
    volatile unsigned char *status_r;
    volatile unsigned char *data_r;
    volatile unsigned char *fcr_r;
    volatile unsigned char *fvr_r;
    unsigned char fcr;
} sun3x_fdc;

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

/* Routines unique to each controller type on a Sun. */
static unsigned char sun3x_82072_fd_inb(int port)
{
    static int once = 0;
//  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 (*sun3x_fdc.status_r) & ~STATUS_DMA;
    case 5: /* FD_DATA */
        return (*sun3x_fdc.data_r);
    case 7: /* FD_DIR */
        /* ugly hack, I can't find a way to actually detect the disk */
        if(!once) {
            once = 1;
            return 0x80;
        }
        return 0;
    };
    panic("sun_82072_fd_inb: How did I get here?");
}

static void sun3x_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 */
        /* Oh geese, 82072 on the Sun has no DOR register,
         * so we make do with taunting the FCR.
         *
         * ASSUMPTIONS:  There will only ever be one floppy
         *               drive attached to a Sun controller
         *               and it will be at drive zero.
         */

    {
        unsigned char fcr = sun3x_fdc.fcr;

        if(value & 0x10) {
            fcr |= (FCR_DSEL0 | FCR_MTRON);
        } else
            fcr &= ~(FCR_DSEL0 | FCR_MTRON);


        if(fcr != sun3x_fdc.fcr) {
            *(sun3x_fdc.fcr_r) = fcr;
            sun3x_fdc.fcr = fcr;
        }
    }
        break;
    case 5: /* FD_DATA */
        *(sun3x_fdc.data_r) = value;
        break;
    case 7: /* FD_DCR */
        *(sun3x_fdc.status_r) = value;
        break;
    case 4: /* FD_STATUS */
        *(sun3x_fdc.status_r) = value;
        break;
    };
    return;
}


asmlinkage irqreturn_t sun3xflop_hardint(int irq, void *dev_id)
{
    register unsigned char st;

#undef TRACE_FLPY_INT
#define NO_FLOPPY_ASSEMBLER

#ifdef TRACE_FLPY_INT
    static int calls=0;
    static int bytes=0;
    static int dma_wait=0;
#endif
    if(!doing_pdma) {
        floppy_interrupt(irq, dev_id);
        return IRQ_HANDLED;
    }

//  printk("doing pdma\n");// st %x\n", sun_fdc->status_82072);

#ifdef TRACE_FLPY_INT
    if(!calls)
        bytes = virtual_dma_count;
#endif

    {
        register int lcount;
        register char *lptr;

        for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
            lcount; lcount--, lptr++) {
/*          st=fd_inb(virtual_dma_port+4) & 0x80 ;  */
            st = *(sun3x_fdc.status_r);
/*          if(st != 0xa0)                  */
/*              break;                  */

            if((st & 0x80) == 0) {
                virtual_dma_count = lcount;
                virtual_dma_addr = lptr;
                return IRQ_HANDLED;
            }

            if((st & 0x20) == 0)
                break;

            if(virtual_dma_mode)
/*              fd_outb(*lptr, virtual_dma_port+5); */
                *(sun3x_fdc.data_r) = *lptr;
            else
/*              *lptr = fd_inb(virtual_dma_port+5); */
                *lptr = *(sun3x_fdc.data_r);
        }

        virtual_dma_count = lcount;
        virtual_dma_addr = lptr;
/*      st = fd_inb(virtual_dma_port+4);   */
        st = *(sun3x_fdc.status_r);
    }

#ifdef TRACE_FLPY_INT
    calls++;
#endif
//  printk("st=%02x\n", st);
    if(st == 0x20)
        return IRQ_HANDLED;
    if(!(st & 0x20)) {
        virtual_dma_residue += virtual_dma_count;
        virtual_dma_count=0;
        doing_pdma = 0;

#ifdef TRACE_FLPY_INT
        printk("count=%x, residue=%x calls=%d bytes=%x dma_wait=%d\n",
               virtual_dma_count, virtual_dma_residue, calls, bytes,
               dma_wait);
        calls = 0;
        dma_wait=0;
#endif

        floppy_interrupt(irq, dev_id);
        return IRQ_HANDLED;
    }


#ifdef TRACE_FLPY_INT
    if(!virtual_dma_count)
        dma_wait++;
#endif
    return IRQ_HANDLED;
}

static int sun3xflop_request_irq(void)
{
    static int once = 0;
    int error;

    if(!once) {
        once = 1;
        error = request_irq(FLOPPY_IRQ, sun3xflop_hardint,
                    IRQF_DISABLED, "floppy", NULL);
        return ((error == 0) ? 0 : -1);
    } else return 0;
}

static void __init floppy_set_flags(int *ints,int param, int param2);

static int sun3xflop_init(void)
{
    if(FLOPPY_IRQ < 0x40)
        FLOPPY_IRQ = SUN3X_FDC_IRQ;

    sun3x_fdc.status_r = (volatile unsigned char *)SUN3X_FDC;
    sun3x_fdc.data_r  = (volatile unsigned char *)(SUN3X_FDC+1);
    sun3x_fdc.fcr_r = (volatile unsigned char *)SUN3X_FDC_FCR;
    sun3x_fdc.fvr_r = (volatile unsigned char *)SUN3X_FDC_FVR;
    sun3x_fdc.fcr = 0;

    /* Last minute sanity check... */
    if(*sun3x_fdc.status_r == 0xff) {
        return -1;
    }

    *sun3x_fdc.fvr_r = FLOPPY_IRQ;

    *sun3x_fdc.fcr_r = FCR_TC;
    udelay(10);
    *sun3x_fdc.fcr_r = 0;

    /* Success... */
    floppy_set_flags(NULL, 1, FD_BROKEN_DCL); // I don't know how to detect this.
    allowed_drive_mask = 0x01;
    return (int) SUN3X_FDC;
}

/* I'm not precisely sure this eject routine works */
static int sun3x_eject(void)
{
    if(MACH_IS_SUN3X) {

        sun3x_fdc.fcr |= (FCR_DSEL0 | FCR_EJECT);
        *(sun3x_fdc.fcr_r) = sun3x_fdc.fcr;
        udelay(10);
        sun3x_fdc.fcr &= ~(FCR_DSEL0 | FCR_EJECT);
        *(sun3x_fdc.fcr_r) = sun3x_fdc.fcr;
    }

    return 0;
}

#define fd_eject(drive) sun3x_eject()

#endif /* !(__ASM_SUN3X_FLOPPY_H) */