drivers/ide/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/pci.h>
  20 #include <linux/ide.h>
  21 #include <linux/init.h>
  22
  23 #define DRV_NAME "rz1000"
  24
  25 static void __devinit init_hwif_rz1000 (ide_hwif_t *hwif)
  26 {
  27         struct pci_dev *dev = to_pci_dev(hwif->dev);
  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", hwif->name);
  34         } else {
  35                 if (hwif->mate)
  36                         hwif->mate->serialized = hwif->serialized = 1;
  37                 hwif->host_flags |= IDE_HFLAG_NO_UNMASK_IRQS;
  38                 printk(KERN_INFO "%s: serialized, disabled unmasking "
  39                         "(buggy RZ1000/RZ1001)\n", hwif->name);
  40         }
  41 }
  42
  43 static const struct ide_port_info rz1000_chipset __devinitdata = {
  44         .name           = DRV_NAME,
  45         .init_hwif      = init_hwif_rz1000,
  46         .chipset        = ide_rz1000,
  47         .host_flags     = IDE_HFLAG_NO_DMA,
  48 };
  49
  50 static int __devinit rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
  51 {
  52         return ide_pci_init_one(dev, &rz1000_chipset, NULL);
  53 }
  54
  55 static const struct pci_device_id rz1000_pci_tbl[] = {
  56         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
  57         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
  58         { 0, },
  59 };
  60 MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
  61
  62 static struct pci_driver rz1000_pci_driver = {
  63         .name           = "RZ1000_IDE",
  64         .id_table       = rz1000_pci_tbl,
  65         .probe          = rz1000_init_one,
  66         .remove         = ide_pci_remove,
  67 };
  68
  69 static int __init rz1000_ide_init(void)
  70 {
  71         return ide_pci_register_driver(&rz1000_pci_driver);
  72 }
  73
  74 static void __exit rz1000_ide_exit(void)
  75 {
  76         pci_unregister_driver(&rz1000_pci_driver);
  77 }
  78
  79 module_init(rz1000_ide_init);
  80 module_exit(rz1000_ide_exit);
  81
  82 MODULE_AUTHOR("Andre Hedrick");
  83 MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
  84 MODULE_LICENSE("GPL");
  85