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Linux Cross Reference
Linux/drivers/ide/rz1000.c

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~ 
  1 /*
  2  *  linux/drivers/ide/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 #include <linux/init.h>
 32 
 33 #include <asm/io.h>
 34 
 35 #ifdef CONFIG_BLK_DEV_IDEPCI
 36 
 37 void __init ide_init_rz1000 (ide_hwif_t *hwif)  /* called from ide-pci.c */
 38 {
 39         unsigned short reg;
 40         struct pci_dev *dev = hwif->pci_dev;
 41 
 42         hwif->chipset = ide_rz1000;
 43         if (!pci_read_config_word (dev, 0x40, &reg)
 44          && !pci_write_config_word(dev, 0x40, reg & 0xdfff))
 45         {
 46                 printk("%s: disabled chipset read-ahead (buggy RZ1000/RZ1001)\n", hwif->name);
 47         } else {
 48                 hwif->serialized = 1;
 49                 hwif->drives[0].no_unmask = 1;
 50                 hwif->drives[1].no_unmask = 1;
 51                 printk("%s: serialized, disabled unmasking (buggy RZ1000/RZ1001)\n", hwif->name);
 52         }
 53 }
 54 
 55 #else
 56 
 57 static void __init init_rz1000 (struct pci_dev *dev, const char *name)
 58 {
 59         unsigned short reg, h;
 60 
 61         if (!pci_read_config_word (dev, PCI_COMMAND, &reg) && !(reg & PCI_COMMAND_IO)) {
 62                 printk("%s: buggy IDE controller disabled (BIOS)\n", name);
 63                 return;
 64         }
 65         if (!pci_read_config_word (dev, 0x40, &reg)
 66          && !pci_write_config_word(dev, 0x40, reg & 0xdfff))
 67         {
 68                 printk("IDE: disabled chipset read-ahead (buggy %s)\n", name);
 69         } else {
 70                 for (h = 0; h < MAX_HWIFS; ++h) {
 71                         ide_hwif_t *hwif = &ide_hwifs[h];
 72                         if ((hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0 || hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
 73                          && (hwif->chipset == ide_unknown || hwif->chipset == ide_generic))
 74                         {
 75                                 hwif->chipset = ide_rz1000;
 76                                 hwif->serialized = 1;
 77                                 hwif->drives[0].no_unmask = 1;
 78                                 hwif->drives[1].no_unmask = 1;
 79                                 if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
 80                                         hwif->channel = 1;
 81                                 printk("%s: serialized, disabled unmasking (buggy %s)\n", hwif->name, name);
 82                         }
 83                 }
 84         }
 85 }
 86 
 87 void __init ide_probe_for_rz100x (void) /* called from ide.c */
 88 {
 89         struct pci_dev *dev = NULL;
 90 
 91         while ((dev = pci_find_device(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, dev))!=NULL)
 92                 init_rz1000 (dev, "RZ1000");
 93         while ((dev = pci_find_device(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, dev))!=NULL)
 94                 init_rz1000 (dev, "RZ1001");
 95 }
 96 
 97 #endif CONFIG_BLK_DEV_IDEPCI
 98
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