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/*
* linux/drivers/block/rz1000.c Version 0.05 December 8, 1997
*
* Copyright (C) 1995-1998 Linus Torvalds & author (see below)
*/
/*
* Principal Author: mlord@pobox.com (Mark Lord)
*
* See linux/MAINTAINERS for address of current maintainer.
*
* This file provides support for disabling the buggy read-ahead
* mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
*
* Dunno if this fixes both ports, or only the primary port (?).
*/
#undef REALLY_SLOW_IO /* most systems can safely undef this */
#include <linux/config.h> /* for CONFIG_BLK_DEV_IDEPCI */
#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 <linux/pci.h>
#include <linux/ide.h>
#include <asm/io.h>
#ifdef CONFIG_BLK_DEV_IDEPCI
void __init ide_init_rz1000 (ide_hwif_t *hwif) /* called from ide-pci.c */
{
unsigned short reg;
struct pci_dev *dev = hwif->pci_dev;
hwif->chipset = ide_rz1000;
if (!pci_read_config_word (dev, 0x40, ®)
&& !pci_write_config_word(dev, 0x40, reg & 0xdfff))
{
printk("%s: disabled chipset read-ahead (buggy RZ1000/RZ1001)\n", hwif->name);
} else {
hwif->serialized = 1;
hwif->drives[0].no_unmask = 1;
hwif->drives[1].no_unmask = 1;
printk("%s: serialized, disabled unmasking (buggy RZ1000/RZ1001)\n", hwif->name);
}
}
#else
static void __init init_rz1000 (struct pci_dev *dev, const char *name)
{
unsigned short reg, h;
if (!pci_read_config_word (dev, PCI_COMMAND, ®) && !(reg & PCI_COMMAND_IO)) {
printk("%s: buggy IDE controller disabled (BIOS)\n", name);
return;
}
if (!pci_read_config_word (dev, 0x40, ®)
&& !pci_write_config_word(dev, 0x40, reg & 0xdfff))
{
printk("IDE: disabled chipset read-ahead (buggy %s)\n", name);
} else {
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;
if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
hwif->channel = 1;
printk("%s: serialized, disabled unmasking (buggy %s)\n", hwif->name, name);
}
}
}
}
void __init ide_probe_for_rz100x (void) /* called from ide.c */
{
struct pci_dev *dev = NULL;
while ((dev = pci_find_device(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, dev))!=NULL)
init_rz1000 (dev, "RZ1000");
while ((dev = pci_find_device(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, dev))!=NULL)
init_rz1000 (dev, "RZ1001");
}
#endif CONFIG_BLK_DEV_IDEPCI
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