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/*

 *  linux/drivers/block/rz1000.c        Version 0.03  Mar 20, 1996

 *

 *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)

 */

/*

 *  Principal Author/Maintainer:  mlord@pobox.com (Mark Lord)

 *

 *  This file provides support for disabling the buggy read-ahead

 *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.

 */

#undef REALLY_SLOW_IO           /* most systems can safely undef this */

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/timer.h>

#include <linux/mm.h>

#include <linux/ioport.h>

#include <linux/blkdev.h>

#include <linux/hdreg.h>

#include <asm/io.h>

#include <linux/bios32.h>

#include <linux/pci.h>

#include "ide.h"

static void ide_pci_access_error (int rc)

{

        printk("ide: pcibios access failed - %s\n", pcibios_strerror(rc));

}

void init_rz1000 (byte bus, byte fn)

{

        int rc;

        unsigned short reg;

        printk("ide0: buggy RZ1000 interface: ");

        if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, &reg))) {

                ide_pci_access_error (rc);

        } else if (!(reg & 1)) {

                printk("not enabled\n");

        } else {

                if ((rc = pcibios_read_config_word(bus, fn, 0x40, &reg))

                 || (rc =  pcibios_write_config_word(bus, fn, 0x40, reg & 0xdfff)))

                {

                        ide_hwifs[0].drives[0].no_unmask = 1;

                        ide_hwifs[0].drives[1].no_unmask = 1;

                        ide_hwifs[1].drives[0].no_unmask = 1;

                        ide_hwifs[1].drives[1].no_unmask = 1;

                        ide_hwifs[0].serialized = 1;

                        ide_hwifs[1].serialized = 1;

                        ide_pci_access_error (rc);

                        printk("serialized, disabled unmasking\n");

                } else

                        printk("disabled read-ahead\n");

        }

}