X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fide%2Frz1000.c;fp=kernel%2Fdrivers%2Fide%2Frz1000.c;h=f4b66f7ec9fd2153c47c45e87b73e84d9c85c161;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

diff --git a/kernel/drivers/ide/rz1000.c b/kernel/drivers/ide/rz1000.c
new file mode 100644
index 000000000..f4b66f7ec
--- /dev/null
+++ b/kernel/drivers/ide/rz1000.c
@@ -0,0 +1,99 @@
+/*
+ *  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 int rz1000_disable_readahead(struct pci_dev *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", pci_name(dev));
+		return 0;
+	} else {
+		printk(KERN_INFO "%s: serialized, disabled unmasking "
+			"(buggy RZ1000/RZ1001)\n", pci_name(dev));
+		return 1;
+	}
+}
+
+static const struct ide_port_info rz1000_chipset = {
+	.name		= DRV_NAME,
+	.host_flags	= IDE_HFLAG_NO_DMA,
+};
+
+static int rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	struct ide_port_info d = rz1000_chipset;
+	int rc;
+
+	rc = pci_enable_device(dev);
+	if (rc)
+		return rc;
+
+	if (rz1000_disable_readahead(dev)) {
+		d.host_flags |= IDE_HFLAG_SERIALIZE;
+		d.host_flags |= IDE_HFLAG_NO_UNMASK_IRQS;
+	}
+
+	return ide_pci_init_one(dev, &d, NULL);
+}
+
+static void rz1000_remove(struct pci_dev *dev)
+{
+	ide_pci_remove(dev);
+	pci_disable_device(dev);
+}
+
+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		= rz1000_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");
+