floppy.h

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/*
 * Architecture specific parts of the Floppy driver
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995
 */
#ifndef __ASM_POWERPC_FLOPPY_H
#define __ASM_POWERPC_FLOPPY_H
#ifdef __KERNEL__

#include <asm/machdep.h>

#define fd_inb(port)        inb_p(port)
#define fd_outb(value,port) outb_p(value,port)

#define fd_enable_dma()         enable_dma(FLOPPY_DMA)
#define fd_disable_dma()     fd_ops->_disable_dma(FLOPPY_DMA)
#define fd_free_dma()           fd_ops->_free_dma(FLOPPY_DMA)
#define fd_clear_dma_ff()       clear_dma_ff(FLOPPY_DMA)
#define fd_set_dma_mode(mode)   set_dma_mode(FLOPPY_DMA, mode)
#define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA, count)
#define fd_get_dma_residue()    fd_ops->_get_dma_residue(FLOPPY_DMA)
#define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
#define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
#define fd_cacheflush(addr,size) /* nothing */
#define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL);

#include <linux/pci.h>
#include <asm/ppc-pci.h>    /* for isa_bridge_pcidev */

#define fd_dma_setup(addr,size,mode,io) fd_ops->_dma_setup(addr,size,mode,io)

static int fd_request_dma(void);

struct fd_dma_ops {
    void (*_disable_dma)(unsigned int dmanr);
    void (*_free_dma)(unsigned int dmanr);
    int (*_get_dma_residue)(unsigned int dummy);
    int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
};

static int virtual_dma_count;
static int virtual_dma_residue;
static char *virtual_dma_addr;
static int virtual_dma_mode;
static int doing_vdma;
static struct fd_dma_ops *fd_ops;

static irqreturn_t floppy_hardint(int irq, void *dev_id)
{
    unsigned char st;
    int lcount;
    char *lptr;

    if (!doing_vdma)
        return floppy_interrupt(irq, dev_id);


    st = 1;
    for (lcount=virtual_dma_count, lptr=virtual_dma_addr;
         lcount; lcount--, lptr++) {
        st=inb(virtual_dma_port+4) & 0xa0 ;
        if (st != 0xa0)
            break;
        if (virtual_dma_mode)
            outb_p(*lptr, virtual_dma_port+5);
        else
            *lptr = inb_p(virtual_dma_port+5);
    }
    virtual_dma_count = lcount;
    virtual_dma_addr = lptr;
    st = inb(virtual_dma_port+4);

    if (st == 0x20)
        return IRQ_HANDLED;
    if (!(st & 0x20)) {
        virtual_dma_residue += virtual_dma_count;
        virtual_dma_count=0;
        doing_vdma = 0;
        floppy_interrupt(irq, dev_id);
        return IRQ_HANDLED;
    }
    return IRQ_HANDLED;
}

static void vdma_disable_dma(unsigned int dummy)
{
    doing_vdma = 0;
    virtual_dma_residue += virtual_dma_count;
    virtual_dma_count=0;
}

static void vdma_nop(unsigned int dummy)
{
}


static int vdma_get_dma_residue(unsigned int dummy)
{
    return virtual_dma_count + virtual_dma_residue;
}


static int fd_request_irq(void)
{
    if (can_use_virtual_dma)
        return request_irq(FLOPPY_IRQ, floppy_hardint,
                   0, "floppy", NULL);
    else
        return request_irq(FLOPPY_IRQ, floppy_interrupt,
                   0, "floppy", NULL);
}

static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
{
    doing_vdma = 1;
    virtual_dma_port = io;
    virtual_dma_mode = (mode  == DMA_MODE_WRITE);
    virtual_dma_addr = addr;
    virtual_dma_count = size;
    virtual_dma_residue = 0;
    return 0;
}

static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
{
    static unsigned long prev_size;
    static dma_addr_t bus_addr = 0;
    static char *prev_addr;
    static int prev_dir;
    int dir;

    doing_vdma = 0;
    dir = (mode == DMA_MODE_READ) ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE;

    if (bus_addr 
        && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
        /* different from last time -- unmap prev */
        pci_unmap_single(isa_bridge_pcidev, bus_addr, prev_size, prev_dir);
        bus_addr = 0;
    }

    if (!bus_addr)  /* need to map it */
        bus_addr = pci_map_single(isa_bridge_pcidev, addr, size, dir);

    /* remember this one as prev */
    prev_addr = addr;
    prev_size = size;
    prev_dir = dir;

    fd_clear_dma_ff();
    fd_cacheflush(addr, size);
    fd_set_dma_mode(mode);
    set_dma_addr(FLOPPY_DMA, bus_addr);
    fd_set_dma_count(size);
    virtual_dma_port = io;
    fd_enable_dma();

    return 0;
}

static struct fd_dma_ops real_dma_ops =
{
    ._disable_dma = disable_dma,
    ._free_dma = free_dma,
    ._get_dma_residue = get_dma_residue,
    ._dma_setup = hard_dma_setup
};

static struct fd_dma_ops virt_dma_ops =
{
    ._disable_dma = vdma_disable_dma,
    ._free_dma = vdma_nop,
    ._get_dma_residue = vdma_get_dma_residue,
    ._dma_setup = vdma_dma_setup
};

static int fd_request_dma(void)
{
    if (can_use_virtual_dma & 1) {
        fd_ops = &virt_dma_ops;
        return 0;
    }
    else {
        fd_ops = &real_dma_ops;
        return request_dma(FLOPPY_DMA, "floppy");
    }
}

static int FDC1 = 0x3f0;
static int FDC2 = -1;

/*
 * Again, the CMOS information not available
 */
#define FLOPPY0_TYPE 6
#define FLOPPY1_TYPE 0

#define N_FDC 2         /* Don't change this! */
#define N_DRIVE 8

/*
 * The PowerPC has no problems with floppy DMA crossing 64k borders.
 */
#define CROSS_64KB(a,s) (0)

#define EXTRA_FLOPPY_PARAMS

#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_FLOPPY_H */