From f07a4c844da9f0ecae5bbee1ab94be56505f26f7 Mon Sep 17 00:00:00 2001
From: Thomas Bushnell <thomas@gnu.org>
Date: Tue, 25 Feb 1997 21:28:37 +0000
Subject: Initial source

---
 i386/i386at/gpl/linux/block/rz1000.c | 56 ++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 i386/i386at/gpl/linux/block/rz1000.c

(limited to 'i386/i386at/gpl/linux/block/rz1000.c')

diff --git a/i386/i386at/gpl/linux/block/rz1000.c b/i386/i386at/gpl/linux/block/rz1000.c
new file mode 100644
index 0000000..11f1dbd
--- /dev/null
+++ b/i386/i386at/gpl/linux/block/rz1000.c
@@ -0,0 +1,56 @@
+/*
+ *  linux/drivers/block/rz1000.c	Version 0.02  Feb 08, 1996
+ *
+ *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
+ */
+
+/*
+ *  Principal Author/Maintainer:  mlord@bnr.ca (Mark Lord)
+ *
+ *  This file provides support for disabling the buggy read-ahead
+ *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
+ */
+
+#undef REALLY_SLOW_IO		/* most systems can safely undef this */
+
+#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 <asm/io.h>
+#include <linux/bios32.h>
+#include <linux/pci.h>
+#include "ide.h"
+
+static void ide_pci_access_error (int rc)
+{
+	printk("ide: pcibios access failed - %s\n", pcibios_strerror(rc));
+}
+
+void init_rz1000 (byte bus, byte fn)
+{
+	int rc;
+	unsigned short reg;
+
+	printk("ide: buggy RZ1000 interface: ");
+	if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, &reg))) {
+		ide_pci_access_error (rc);
+	} else if (!(reg & 1)) {
+		printk("not enabled\n");
+	} else {
+		if ((rc = pcibios_read_config_word(bus, fn, 0x40, &reg))
+		 || (rc =  pcibios_write_config_word(bus, fn, 0x40, reg & 0xdfff)))
+		{
+			ide_hwifs[0].no_unmask = 1;
+			ide_hwifs[1].no_unmask = 1;
+			ide_hwifs[0].serialized = 1;
+			ide_pci_access_error (rc);
+			printk("serialized, disabled unmasking\n");
+		} else
+			printk("disabled read-ahead\n");
+	}
+}
-- 
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