LXR linux/drivers/ide/rz1000.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
   4 */
   5
   6/*
   7 *  Principal Author:  mlord@pobox.com (Mark Lord)
   8 *
   9 *  See linux/MAINTAINERS for address of current maintainer.
  10 *
  11 *  This file provides support for disabling the buggy read-ahead
  12 *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
  13 *
  14 *  Dunno if this fixes both ports, or only the primary port (?).
  15 */
  16
  17#include <linux/types.h>
  18#include <linux/module.h>
  19#include <linux/kernel.h>
  20#include <linux/pci.h>
  21#include <linux/ide.h>
  22#include <linux/init.h>
  23
  24#define DRV_NAME "rz1000"
  25
  26static int rz1000_disable_readahead(struct pci_dev *dev)
  27{
  28        u16 reg;
  29
  30        if (!pci_read_config_word (dev, 0x40, &reg) &&
  31            !pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
  32                printk(KERN_INFO "%s: disabled chipset read-ahead "
  33                        "(buggy RZ1000/RZ1001)\n", pci_name(dev));
  34                return 0;
  35        } else {
  36                printk(KERN_INFO "%s: serialized, disabled unmasking "
  37                        "(buggy RZ1000/RZ1001)\n", pci_name(dev));
  38                return 1;
  39        }
  40}
  41
  42static const struct ide_port_info rz1000_chipset = {
  43        .name           = DRV_NAME,
  44        .host_flags     = IDE_HFLAG_NO_DMA,
  45};
  46
  47static int rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
  48{
  49        struct ide_port_info d = rz1000_chipset;
  50        int rc;
  51
  52        rc = pci_enable_device(dev);
  53        if (rc)
  54                return rc;
  55
  56        if (rz1000_disable_readahead(dev)) {
  57                d.host_flags |= IDE_HFLAG_SERIALIZE;
  58                d.host_flags |= IDE_HFLAG_NO_UNMASK_IRQS;
  59        }
  60
  61        return ide_pci_init_one(dev, &d, NULL);
  62}
  63
  64static void rz1000_remove(struct pci_dev *dev)
  65{
  66        ide_pci_remove(dev);
  67        pci_disable_device(dev);
  68}
  69
  70static const struct pci_device_id rz1000_pci_tbl[] = {
  71        { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
  72        { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
  73        { 0, },
  74};
  75MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
  76
  77static struct pci_driver rz1000_pci_driver = {
  78        .name           = "RZ1000_IDE",
  79        .id_table       = rz1000_pci_tbl,
  80        .probe          = rz1000_init_one,
  81        .remove         = rz1000_remove,
  82};
  83
  84static int __init rz1000_ide_init(void)
  85{
  86        return ide_pci_register_driver(&rz1000_pci_driver);
  87}
  88
  89static void __exit rz1000_ide_exit(void)
  90{
  91        pci_unregister_driver(&rz1000_pci_driver);
  92}
  93
  94module_init(rz1000_ide_init);
  95module_exit(rz1000_ide_exit);
  96
  97MODULE_AUTHOR("Andre Hedrick");
  98MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
  99MODULE_LICENSE("GPL");
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