1 /*
2 * Copyright (C) 1995-1998 Linus Torvalds & author (see below)
3 */
4
5 /*
6 * Principal Author: mlord@pobox.com (Mark Lord)
7 *
8 * See linux/MAINTAINERS for address of current maintainer.
9 *
10 * This file provides support for disabling the buggy read-ahead
11 * mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
12 *
13 * Dunno if this fixes both ports, or only the primary port (?).
14 */
15
16 #include <linux/types.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/pci.h>
20 #include <linux/ide.h>
21 #include <linux/init.h>
22
23 #define DRV_NAME "rz1000"
24
rz1000_disable_readahead(struct pci_dev * dev)25 static int rz1000_disable_readahead(struct pci_dev *dev)
26 {
27 u16 reg;
28
29 if (!pci_read_config_word (dev, 0x40, ®) &&
30 !pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
31 printk(KERN_INFO "%s: disabled chipset read-ahead "
32 "(buggy RZ1000/RZ1001)\n", pci_name(dev));
33 return 0;
34 } else {
35 printk(KERN_INFO "%s: serialized, disabled unmasking "
36 "(buggy RZ1000/RZ1001)\n", pci_name(dev));
37 return 1;
38 }
39 }
40
41 static const struct ide_port_info rz1000_chipset = {
42 .name = DRV_NAME,
43 .host_flags = IDE_HFLAG_NO_DMA,
44 };
45
rz1000_init_one(struct pci_dev * dev,const struct pci_device_id * id)46 static int rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
47 {
48 struct ide_port_info d = rz1000_chipset;
49 int rc;
50
51 rc = pci_enable_device(dev);
52 if (rc)
53 return rc;
54
55 if (rz1000_disable_readahead(dev)) {
56 d.host_flags |= IDE_HFLAG_SERIALIZE;
57 d.host_flags |= IDE_HFLAG_NO_UNMASK_IRQS;
58 }
59
60 return ide_pci_init_one(dev, &d, NULL);
61 }
62
rz1000_remove(struct pci_dev * dev)63 static void rz1000_remove(struct pci_dev *dev)
64 {
65 ide_pci_remove(dev);
66 pci_disable_device(dev);
67 }
68
69 static const struct pci_device_id rz1000_pci_tbl[] = {
70 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
71 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
72 { 0, },
73 };
74 MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
75
76 static struct pci_driver rz1000_pci_driver = {
77 .name = "RZ1000_IDE",
78 .id_table = rz1000_pci_tbl,
79 .probe = rz1000_init_one,
80 .remove = rz1000_remove,
81 };
82
rz1000_ide_init(void)83 static int __init rz1000_ide_init(void)
84 {
85 return ide_pci_register_driver(&rz1000_pci_driver);
86 }
87
rz1000_ide_exit(void)88 static void __exit rz1000_ide_exit(void)
89 {
90 pci_unregister_driver(&rz1000_pci_driver);
91 }
92
93 module_init(rz1000_ide_init);
94 module_exit(rz1000_ide_exit);
95
96 MODULE_AUTHOR("Andre Hedrick");
97 MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
98 MODULE_LICENSE("GPL");
99
100