drivers/ide/pci/rz1000.c

   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/hdreg.h>
  20 #include <linux/pci.h>
  21 #include <linux/ide.h>
  22 #include <linux/init.h>
  23
  24 static void __devinit init_hwif_rz1000 (ide_hwif_t *hwif)
  25 {
  26         struct pci_dev *dev = to_pci_dev(hwif->dev);
  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", hwif->name);
  33         } else {
  34                 if (hwif->mate)
  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);
  39         }
  40 }
  41
  42 static const struct ide_port_info rz1000_chipset __devinitdata = {
  43         .name           = "RZ100x",
  44         .init_hwif      = init_hwif_rz1000,
  45         .chipset        = ide_rz1000,
  46         .host_flags     = IDE_HFLAG_NO_DMA,
  47 };
  48
  49 static int __devinit rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
  50 {
  51         return ide_setup_pci_device(dev, &rz1000_chipset);
  52 }
  53
  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 },
  57         { 0, },
  58 };
  59 MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
  60
  61 static struct pci_driver driver = {
  62         .name           = "RZ1000_IDE",
  63         .id_table       = rz1000_pci_tbl,
  64         .probe          = rz1000_init_one,
  65 };
  66
  67 static int __init rz1000_ide_init(void)
  68 {
  69         return ide_pci_register_driver(&driver);
  70 }
  71
  72 module_init(rz1000_ide_init);
  73
  74 MODULE_AUTHOR("Andre Hedrick");
  75 MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
  76 MODULE_LICENSE("GPL");
  77