drivers/block/rz1000.c

   1 /*
   2  *  linux/drivers/block/rz1000.c                Version 0.05    December 8, 1997
   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 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
  19
  20 #include <linux/config.h> /* for CONFIG_BLK_DEV_IDEPCI */
  21 #include <linux/types.h>
  22 #include <linux/kernel.h>
  23 #include <linux/delay.h>
  24 #include <linux/timer.h>
  25 #include <linux/mm.h>
  26 #include <linux/ioport.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/pci.h>
  30 #include <linux/ide.h>
  31
  32 #include <asm/io.h>
  33
  34 #ifdef CONFIG_BLK_DEV_IDEPCI
  35
  36 void __init ide_init_rz1000 (ide_hwif_t *hwif)  /* called from ide-pci.c */
  37 {
  38         unsigned short reg;
  39         struct pci_dev *dev = hwif->pci_dev;
  40
  41         hwif->chipset = ide_rz1000;
  42         if (!pci_read_config_word (dev, 0x40, &reg)
  43          && !pci_write_config_word(dev, 0x40, reg & 0xdfff))
  44         {
  45                 printk("%s: disabled chipset read-ahead (buggy RZ1000/RZ1001)\n", hwif->name);
  46         } else {
  47                 hwif->serialized = 1;
  48                 hwif->drives[0].no_unmask = 1;
  49                 hwif->drives[1].no_unmask = 1;
  50                 printk("%s: serialized, disabled unmasking (buggy RZ1000/RZ1001)\n", hwif->name);
  51         }
  52 }
  53
  54 #else
  55
  56 static void __init init_rz1000 (struct pci_dev *dev, const char *name)
  57 {
  58         unsigned short reg, h;
  59
  60         if (!pci_read_config_word (dev, PCI_COMMAND, &reg) && !(reg & PCI_COMMAND_IO)) {
  61                 printk("%s: buggy IDE controller disabled (BIOS)\n", name);
  62                 return;
  63         }
  64         if (!pci_read_config_word (dev, 0x40, &reg)
  65          && !pci_write_config_word(dev, 0x40, reg & 0xdfff))
  66         {
  67                 printk("IDE: disabled chipset read-ahead (buggy %s)\n", name);
  68         } else {
  69                 for (h = 0; h < MAX_HWIFS; ++h) {
  70                         ide_hwif_t *hwif = &ide_hwifs[h];
  71                         if ((hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0 || hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
  72                          && (hwif->chipset == ide_unknown || hwif->chipset == ide_generic))
  73                         {
  74                                 hwif->chipset = ide_rz1000;
  75                                 hwif->serialized = 1;
  76                                 hwif->drives[0].no_unmask = 1;
  77                                 hwif->drives[1].no_unmask = 1;
  78                                 if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
  79                                         hwif->channel = 1;
  80                                 printk("%s: serialized, disabled unmasking (buggy %s)\n", hwif->name, name);
  81                         }
  82                 }
  83         }
  84 }
  85
  86 void __init ide_probe_for_rz100x (void) /* called from ide.c */
  87 {
  88         struct pci_dev *dev = NULL;
  89
  90         while ((dev = pci_find_device(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, dev))!=NULL)
  91                 init_rz1000 (dev, "RZ1000");
  92         while ((dev = pci_find_device(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, dev))!=NULL)
  93                 init_rz1000 (dev, "RZ1001");
  94 }
  95
  96 #endif CONFIG_BLK_DEV_IDEPCI