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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, ®))) {
ide_pci_access_error (rc);
} else if (!(reg & 1)) {
printk("not enabled\n");
} else {
if ((rc = pcibios_read_config_word(bus, fn, 0x40, ®))
|| (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");
}
}
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