1 files changed, 85 insertions, 0 deletions

diff --git a/drivers/ide/rz1000.c b/drivers/ide/rz1000.c
new file mode 100644
index 000000000000..7daf0135cbac
--- /dev/null
+++ b/drivers/ide/rz1000.c
@@ -0,0 +1,85 @@
+/*
+ *  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 (?).
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/ide.h>
+#include <linux/init.h>
+
+#define DRV_NAME "rz1000"
+
+static void __devinit init_hwif_rz1000 (ide_hwif_t *hwif)
+{
+        struct pci_dev *dev = to_pci_dev(hwif->dev);
+        u16 reg;
+
+        if (!pci_read_config_word (dev, 0x40, &reg) &&
+            !pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
+                printk(KERN_INFO "%s: disabled chipset read-ahead "
+                        "(buggy RZ1000/RZ1001)\n", hwif->name);
+        } else {
+                if (hwif->mate)
+                        hwif->mate->serialized = hwif->serialized = 1;
+                hwif->host_flags |= IDE_HFLAG_NO_UNMASK_IRQS;
+                printk(KERN_INFO "%s: serialized, disabled unmasking "
+                        "(buggy RZ1000/RZ1001)\n", hwif->name);
+        }
+}
+
+static const struct ide_port_info rz1000_chipset __devinitdata = {
+        .name           = DRV_NAME,
+        .init_hwif      = init_hwif_rz1000,
+        .chipset        = ide_rz1000,
+        .host_flags     = IDE_HFLAG_NO_DMA,
+};
+
+static int __devinit rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+        return ide_pci_init_one(dev, &rz1000_chipset, NULL);
+}
+
+static const struct pci_device_id rz1000_pci_tbl[] = {
+        { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
+        { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
+        { 0, },
+};
+MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
+
+static struct pci_driver rz1000_pci_driver = {
+        .name           = "RZ1000_IDE",
+        .id_table       = rz1000_pci_tbl,
+        .probe          = rz1000_init_one,
+        .remove         = ide_pci_remove,
+};
+
+static int __init rz1000_ide_init(void)
+{
+        return ide_pci_register_driver(&rz1000_pci_driver);
+}
+
+static void __exit rz1000_ide_exit(void)
+{
+        pci_unregister_driver(&rz1000_pci_driver);
+}
+
+module_init(rz1000_ide_init);
+module_exit(rz1000_ide_exit);
+
+MODULE_AUTHOR("Andre Hedrick");
+MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
+MODULE_LICENSE("GPL");
+