rz1000.c
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- /*
- * linux/drivers/ide/rz1000.c Version 0.05 December 8, 1997
- *
- * Copyright (C) 1995-1998 Linus Torvalds & author (see below)
- */
- /*
- * Principal Author: mlord@pobox.com (Mark Lord)
- *
- * See linux/MAINTAINERS for address of current maintainer.
- *
- * This file provides support for disabling the buggy read-ahead
- * mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
- *
- * Dunno if this fixes both ports, or only the primary port (?).
- */
- #undef REALLY_SLOW_IO /* most systems can safely undef this */
- #include <linux/config.h> /* for CONFIG_BLK_DEV_IDEPCI */
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/timer.h>
- #include <linux/mm.h>
- #include <linux/ioport.h>
- #include <linux/blkdev.h>
- #include <linux/hdreg.h>
- #include <linux/pci.h>
- #include <linux/ide.h>
- #include <linux/init.h>
- #include <asm/io.h>
- #ifdef CONFIG_BLK_DEV_IDEPCI
- void __init ide_init_rz1000 (ide_hwif_t *hwif) /* called from ide-pci.c */
- {
- unsigned short reg;
- struct pci_dev *dev = hwif->pci_dev;
- hwif->chipset = ide_rz1000;
- if (!pci_read_config_word (dev, 0x40, ®)
- && !pci_write_config_word(dev, 0x40, reg & 0xdfff))
- {
- printk("%s: disabled chipset read-ahead (buggy RZ1000/RZ1001)n", hwif->name);
- } else {
- hwif->serialized = 1;
- hwif->drives[0].no_unmask = 1;
- hwif->drives[1].no_unmask = 1;
- printk("%s: serialized, disabled unmasking (buggy RZ1000/RZ1001)n", hwif->name);
- }
- }
- #else
- static void __init init_rz1000 (struct pci_dev *dev, const char *name)
- {
- unsigned short reg, h;
- if (!pci_read_config_word (dev, PCI_COMMAND, ®) && !(reg & PCI_COMMAND_IO)) {
- printk("%s: buggy IDE controller disabled (BIOS)n", name);
- return;
- }
- if (!pci_read_config_word (dev, 0x40, ®)
- && !pci_write_config_word(dev, 0x40, reg & 0xdfff))
- {
- printk("IDE: disabled chipset read-ahead (buggy %s)n", name);
- } else {
- for (h = 0; h < MAX_HWIFS; ++h) {
- ide_hwif_t *hwif = &ide_hwifs[h];
- if ((hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0 || hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
- && (hwif->chipset == ide_unknown || hwif->chipset == ide_generic))
- {
- hwif->chipset = ide_rz1000;
- hwif->serialized = 1;
- hwif->drives[0].no_unmask = 1;
- hwif->drives[1].no_unmask = 1;
- if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
- hwif->channel = 1;
- printk("%s: serialized, disabled unmasking (buggy %s)n", hwif->name, name);
- }
- }
- }
- }
- void __init ide_probe_for_rz100x (void) /* called from ide.c */
- {
- struct pci_dev *dev = NULL;
- while ((dev = pci_find_device(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, dev))!=NULL)
- init_rz1000 (dev, "RZ1000");
- while ((dev = pci_find_device(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, dev))!=NULL)
- init_rz1000 (dev, "RZ1001");
- }
- #endif /* CONFIG_BLK_DEV_IDEPCI */