Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / ide / rz1000.c

diff --git a/kernel/drivers/ide/rz1000.c b/kernel/drivers/ide/rz1000.c
new file mode 100644 (file)
index 0000000..f4b66f7
--- /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");
+