// SPDX-License-Identifier: GPL-2.0-only /* * 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");