drivers/ide/pci/rz1000.c

   1 /*
   2  *  linux/drivers/ide/pci/rz1000.c      Version 0.06    January 12, 2003
   3  *
   4  *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
   5  */
   6
   7 /*
   8  *  Principal Author:  mlord@pobox.com (Mark Lord)
   9  *
  10  *  See linux/MAINTAINERS for address of current maintainer.
  11  *
  12  *  This file provides support for disabling the buggy read-ahead
  13  *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
  14  *
  15  *  Dunno if this fixes both ports, or only the primary port (?).
  16  */
  17
  18 #include <linux/types.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/delay.h>
  22 #include <linux/timer.h>
  23 #include <linux/mm.h>
  24 #include <linux/ioport.h>
  25 #include <linux/blkdev.h>
  26 #include <linux/hdreg.h>
  27 #include <linux/pci.h>
  28 #include <linux/ide.h>
  29 #include <linux/init.h>
  30
  31 #include <asm/io.h>
  32
  33 static void __devinit init_hwif_rz1000 (ide_hwif_t *hwif)
  34 {
  35         struct pci_dev *dev = to_pci_dev(hwif->dev);
  36         u16 reg;
  37
  38         if (!pci_read_config_word (dev, 0x40, &reg) &&
  39             !pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
  40                 printk(KERN_INFO "%s: disabled chipset read-ahead "
  41                         "(buggy RZ1000/RZ1001)\n", hwif->name);
  42         } else {
  43                 if (hwif->mate)
  44                         hwif->mate->serialized = hwif->serialized = 1;
  45                 hwif->drives[0].no_unmask = 1;
  46                 hwif->drives[1].no_unmask = 1;
  47                 printk(KERN_INFO "%s: serialized, disabled unmasking "
  48                         "(buggy RZ1000/RZ1001)\n", hwif->name);
  49         }
  50 }
  51
  52 static const struct ide_port_info rz1000_chipset __devinitdata = {
  53         .name           = "RZ100x",
  54         .init_hwif      = init_hwif_rz1000,
  55         .chipset        = ide_rz1000,
  56         .host_flags     = IDE_HFLAG_NO_DMA | IDE_HFLAG_BOOTABLE,
  57 };
  58
  59 static int __devinit rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
  60 {
  61         return ide_setup_pci_device(dev, &rz1000_chipset);
  62 }
  63
  64 static const struct pci_device_id rz1000_pci_tbl[] = {
  65         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
  66         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
  67         { 0, },
  68 };
  69 MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
  70
  71 static struct pci_driver driver = {
  72         .name           = "RZ1000_IDE",
  73         .id_table       = rz1000_pci_tbl,
  74         .probe          = rz1000_init_one,
  75 };
  76
  77 static int __init rz1000_ide_init(void)
  78 {
  79         return ide_pci_register_driver(&driver);
  80 }
  81
  82 module_init(rz1000_ide_init);
  83
  84 MODULE_AUTHOR("Andre Hedrick");
  85 MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
  86 MODULE_LICENSE("GPL");
  87