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 #define DRV_NAME "rz1000"
  25
  26 static void __devinit init_hwif_rz1000 (ide_hwif_t *hwif)
  27 {
  28         struct pci_dev *dev = to_pci_dev(hwif->dev);
  29         u16 reg;
  30
  31         if (!pci_read_config_word (dev, 0x40, &reg) &&
  32             !pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
  33                 printk(KERN_INFO "%s: disabled chipset read-ahead "
  34                         "(buggy RZ1000/RZ1001)\n", hwif->name);
  35         } else {
  36                 if (hwif->mate)
  37                         hwif->mate->serialized = hwif->serialized = 1;
  38                 hwif->host_flags |= IDE_HFLAG_NO_UNMASK_IRQS;
  39                 printk(KERN_INFO "%s: serialized, disabled unmasking "
  40                         "(buggy RZ1000/RZ1001)\n", hwif->name);
  41         }
  42 }
  43
  44 static const struct ide_port_info rz1000_chipset __devinitdata = {
  45         .name           = DRV_NAME,
  46         .init_hwif      = init_hwif_rz1000,
  47         .chipset        = ide_rz1000,
  48         .host_flags     = IDE_HFLAG_NO_DMA,
  49 };
  50
  51 static int __devinit rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
  52 {
  53         return ide_pci_init_one(dev, &rz1000_chipset, NULL);
  54 }
  55
  56 static const struct pci_device_id rz1000_pci_tbl[] = {
  57         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
  58         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
  59         { 0, },
  60 };
  61 MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
  62
  63 static struct pci_driver driver = {
  64         .name           = "RZ1000_IDE",
  65         .id_table       = rz1000_pci_tbl,
  66         .probe          = rz1000_init_one,
  67         .remove         = ide_pci_remove,
  68 };
  69
  70 static int __init rz1000_ide_init(void)
  71 {
  72         return ide_pci_register_driver(&driver);
  73 }
  74
  75 static void __exit rz1000_ide_exit(void)
  76 {
  77         pci_unregister_driver(&driver);
  78 }
  79
  80 module_init(rz1000_ide_init);
  81 module_exit(rz1000_ide_exit);
  82
  83 MODULE_AUTHOR("Andre Hedrick");
  84 MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
  85 MODULE_LICENSE("GPL");
  86