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/*
* 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 (?).
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/init.h>
#define DRV_NAME "rz1000"
static int rz1000_disable_readahead(struct pci_dev *dev)
{
u16 reg;
if (!pci_read_config_word (dev, 0x40, ®) &&
!pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
printk(KERN_INFO "%s: disabled chipset read-ahead "
"(buggy RZ1000/RZ1001)\n", pci_name(dev));
return 0;
} else {
printk(KERN_INFO "%s: serialized, disabled unmasking "
"(buggy RZ1000/RZ1001)\n", pci_name(dev));
return 1;
}
}
static const struct ide_port_info rz1000_chipset = {
.name = DRV_NAME,
.host_flags = IDE_HFLAG_NO_DMA,
};
static int rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
struct ide_port_info d = rz1000_chipset;
int rc;
rc = pci_enable_device(dev);
if (rc)
return rc;
if (rz1000_disable_readahead(dev)) {
d.host_flags |= IDE_HFLAG_SERIALIZE;
d.host_flags |= IDE_HFLAG_NO_UNMASK_IRQS;
}
return ide_pci_init_one(dev, &d, NULL);
}
static void rz1000_remove(struct pci_dev *dev)
{
ide_pci_remove(dev);
pci_disable_device(dev);
}
static const struct pci_device_id rz1000_pci_tbl[] = {
{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
static struct pci_driver rz1000_pci_driver = {
.name = "RZ1000_IDE",
.id_table = rz1000_pci_tbl,
.probe = rz1000_init_one,
.remove = rz1000_remove,
};
static int __init rz1000_ide_init(void)
{
return ide_pci_register_driver(&rz1000_pci_driver);
}
static void __exit rz1000_ide_exit(void)
{
pci_unregister_driver(&rz1000_pci_driver);
}
module_init(rz1000_ide_init);
module_exit(rz1000_ide_exit);
MODULE_AUTHOR("Andre Hedrick");
MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
MODULE_LICENSE("GPL");
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