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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 | |
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 | |
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 | |
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 | |
83 | static int __init rz1000_ide_init(void) |
84 | { |
85 | return ide_pci_register_driver(&rz1000_pci_driver); |
86 | } |
87 | |
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 |
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