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