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path: root/drivers/ide/rz1000.c
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Diffstat (limited to 'drivers/ide/rz1000.c')
-rw-r--r--drivers/ide/rz1000.c85
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");
+