patch-2.3.99-pre1 linux/drivers/ide/rz1000.c

• Lines: 97
• Date: Sat Feb 26 20:32:14 2000
• Orig file: v2.3.51/linux/drivers/ide/rz1000.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.51/linux/drivers/ide/rz1000.c linux/drivers/ide/rz1000.c
@@ -0,0 +1,96 @@
+/*
+ *  linux/drivers/block/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 <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, &reg)
+	 && !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) && !(reg & PCI_COMMAND_IO)) {
+		printk("%s: buggy IDE controller disabled (BIOS)\n", name);
+		return;
+	}
+	if (!pci_read_config_word (dev, 0x40, &reg)
+	 && !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