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/delay.h>
  20 #include <linux/timer.h>
  21 #include <linux/mm.h>
  22 #include <linux/ioport.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/hdreg.h>
  25 #include <linux/pci.h>
  26 #include <linux/ide.h>
  27 #include <linux/init.h>
  28
  29 #include <asm/io.h>
  30
  31 static void __devinit init_hwif_rz1000 (ide_hwif_t *hwif)
  32 {
  33         struct pci_dev *dev = to_pci_dev(hwif->dev);
  34         u16 reg;
  35
  36         if (!pci_read_config_word (dev, 0x40, &reg) &&
  37             !pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
  38                 printk(KERN_INFO "%s: disabled chipset read-ahead "
  39                         "(buggy RZ1000/RZ1001)\n", hwif->name);
  40         } else {
  41                 if (hwif->mate)
  42                         hwif->mate->serialized = hwif->serialized = 1;
  43                 hwif->drives[0].no_unmask = 1;
  44                 hwif->drives[1].no_unmask = 1;
  45                 printk(KERN_INFO "%s: serialized, disabled unmasking "
  46                         "(buggy RZ1000/RZ1001)\n", hwif->name);
  47         }
  48 }
  49
  50 static const struct ide_port_info rz1000_chipset __devinitdata = {
  51         .name           = "RZ100x",
  52         .init_hwif      = init_hwif_rz1000,
  53         .chipset        = ide_rz1000,
  54         .host_flags     = IDE_HFLAG_NO_DMA | IDE_HFLAG_BOOTABLE,
  55 };
  56
  57 static int __devinit rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
  58 {
  59         return ide_setup_pci_device(dev, &rz1000_chipset);
  60 }
  61
  62 static const struct pci_device_id rz1000_pci_tbl[] = {
  63         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
  64         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
  65         { 0, },
  66 };
  67 MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
  68
  69 static struct pci_driver driver = {
  70         .name           = "RZ1000_IDE",
  71         .id_table       = rz1000_pci_tbl,
  72         .probe          = rz1000_init_one,
  73 };
  74
  75 static int __init rz1000_ide_init(void)
  76 {
  77         return ide_pci_register_driver(&driver);
  78 }
  79
  80 module_init(rz1000_ide_init);
  81
  82 MODULE_AUTHOR("Andre Hedrick");
  83 MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
  84 MODULE_LICENSE("GPL");
  85