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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 init_rz1000 (byte bus, byte fn, const char *name)
{
unsigned short reg, h;
printk("%s: buggy IDE controller: ", name);
if (!pcibios_read_config_word (bus, fn, PCI_COMMAND, ®) && !(reg & 1)) {
printk("disabled (BIOS)\n");
return;
}
if (!pcibios_read_config_word (bus, fn, 0x40, ®)
&& !pcibios_write_config_word(bus, fn, 0x40, reg & 0xdfff))
{
printk("disabled read-ahead\n");
} else {
printk("\n");
for (h = 0; h < MAX_HWIFS; ++h) {
ide_hwif_t *hwif = &ide_hwifs[h];
if ((hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0 || hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
&& (hwif->chipset == ide_unknown || hwif->chipset == ide_generic))
{
hwif->chipset = ide_rz1000;
hwif->serialized = 1;
hwif->drives[0].no_unmask = 1;
hwif->drives[1].no_unmask = 1;
printk(" %s: serialized, disabled unmasking\n", hwif->name);
}
}
}
}
void ide_probe_for_rz100x (void)
{
byte index, bus, fn;
for (index = 0; !pcibios_find_device (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, index, &bus, &fn); ++index)
init_rz1000 (bus, fn, "RZ1000");
for (index = 0; !pcibios_find_device (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, index, &bus, &fn); ++index)
init_rz1000 (bus, fn, "RZ1001");
}
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