100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/*
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* Copyright (C) 1995-1998 Linus Torvalds & author (see below)
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*/
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/*
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* Principal Author: mlord@pobox.com (Mark Lord)
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*
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* See linux/MAINTAINERS for address of current maintainer.
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*
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* This file provides support for disabling the buggy read-ahead
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* mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
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*
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* Dunno if this fixes both ports, or only the primary port (?).
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*/
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/ide.h>
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#include <linux/init.h>
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#define DRV_NAME "rz1000"
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static int __devinit rz1000_disable_readahead(struct pci_dev *dev)
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{
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u16 reg;
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if (!pci_read_config_word (dev, 0x40, ®) &&
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!pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
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printk(KERN_INFO "%s: disabled chipset read-ahead "
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"(buggy RZ1000/RZ1001)\n", pci_name(dev));
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return 0;
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} else {
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printk(KERN_INFO "%s: serialized, disabled unmasking "
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"(buggy RZ1000/RZ1001)\n", pci_name(dev));
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return 1;
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}
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}
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static const struct ide_port_info rz1000_chipset __devinitconst = {
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.name = DRV_NAME,
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.host_flags = IDE_HFLAG_NO_DMA,
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};
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static int __devinit rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
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{
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struct ide_port_info d = rz1000_chipset;
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int rc;
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rc = pci_enable_device(dev);
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if (rc)
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return rc;
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if (rz1000_disable_readahead(dev)) {
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d.host_flags |= IDE_HFLAG_SERIALIZE;
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d.host_flags |= IDE_HFLAG_NO_UNMASK_IRQS;
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}
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return ide_pci_init_one(dev, &d, NULL);
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}
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static void rz1000_remove(struct pci_dev *dev)
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{
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ide_pci_remove(dev);
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pci_disable_device(dev);
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}
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static const struct pci_device_id rz1000_pci_tbl[] = {
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{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
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{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
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{ 0, },
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};
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MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
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static struct pci_driver rz1000_pci_driver = {
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.name = "RZ1000_IDE",
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.id_table = rz1000_pci_tbl,
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.probe = rz1000_init_one,
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.remove = rz1000_remove,
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};
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static int __init rz1000_ide_init(void)
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{
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return ide_pci_register_driver(&rz1000_pci_driver);
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}
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static void __exit rz1000_ide_exit(void)
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{
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pci_unregister_driver(&rz1000_pci_driver);
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}
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module_init(rz1000_ide_init);
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module_exit(rz1000_ide_exit);
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MODULE_AUTHOR("Andre Hedrick");
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MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
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MODULE_LICENSE("GPL");
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