2 * Copyright (C) 1995-1998 Linus Torvalds & author (see below)
6 * Principal Author: mlord@pobox.com (Mark Lord)
8 * See linux/MAINTAINERS for address of current maintainer.
10 * This file provides support for disabling the buggy read-ahead
11 * mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
13 * Dunno if this fixes both ports, or only the primary port (?).
16 #include <linux/types.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/hdreg.h>
20 #include <linux/pci.h>
21 #include <linux/ide.h>
22 #include <linux/init.h>
24 static void __devinit init_hwif_rz1000 (ide_hwif_t *hwif)
26 struct pci_dev *dev = to_pci_dev(hwif->dev);
29 if (!pci_read_config_word (dev, 0x40, ®) &&
30 !pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
31 printk(KERN_INFO "%s: disabled chipset read-ahead "
32 "(buggy RZ1000/RZ1001)\n", hwif->name);
35 hwif->mate->serialized = hwif->serialized = 1;
36 hwif->host_flags |= IDE_HFLAG_NO_UNMASK_IRQS;
37 printk(KERN_INFO "%s: serialized, disabled unmasking "
38 "(buggy RZ1000/RZ1001)\n", hwif->name);
42 static const struct ide_port_info rz1000_chipset __devinitdata = {
44 .init_hwif = init_hwif_rz1000,
45 .chipset = ide_rz1000,
46 .host_flags = IDE_HFLAG_NO_DMA,
49 static int __devinit rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
51 return ide_pci_init_one(dev, &rz1000_chipset, NULL);
54 static const struct pci_device_id rz1000_pci_tbl[] = {
55 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
56 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
59 MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
61 static struct pci_driver driver = {
63 .id_table = rz1000_pci_tbl,
64 .probe = rz1000_init_one,
67 static int __init rz1000_ide_init(void)
69 return ide_pci_register_driver(&driver);
72 module_init(rz1000_ide_init);
74 MODULE_AUTHOR("Andre Hedrick");
75 MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
76 MODULE_LICENSE("GPL");