Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Copyright (C) 1995-1998 Linus Torvalds & author (see below) |
4 | */ | |
5 | ||
6 | /* | |
7 | * Principal Author: mlord@pobox.com (Mark Lord) | |
8 | * | |
9 | * See linux/MAINTAINERS for address of current maintainer. | |
10 | * | |
11 | * This file provides support for disabling the buggy read-ahead | |
12 | * mode of the RZ1000 IDE chipset, commonly used on Intel motherboards. | |
13 | * | |
14 | * Dunno if this fixes both ports, or only the primary port (?). | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/types.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/kernel.h> | |
1da177e4 LT |
20 | #include <linux/pci.h> |
21 | #include <linux/ide.h> | |
22 | #include <linux/init.h> | |
23 | ||
ced3ec8a BZ |
24 | #define DRV_NAME "rz1000" |
25 | ||
fe31edc8 | 26 | static int rz1000_disable_readahead(struct pci_dev *dev) |
1da177e4 LT |
27 | { |
28 | u16 reg; | |
1da177e4 | 29 | |
1da177e4 LT |
30 | if (!pci_read_config_word (dev, 0x40, ®) && |
31 | !pci_write_config_word(dev, 0x40, reg & 0xdfff)) { | |
32 | printk(KERN_INFO "%s: disabled chipset read-ahead " | |
7f1ac8c4 BZ |
33 | "(buggy RZ1000/RZ1001)\n", pci_name(dev)); |
34 | return 0; | |
1da177e4 | 35 | } else { |
1da177e4 | 36 | printk(KERN_INFO "%s: serialized, disabled unmasking " |
7f1ac8c4 BZ |
37 | "(buggy RZ1000/RZ1001)\n", pci_name(dev)); |
38 | return 1; | |
1da177e4 LT |
39 | } |
40 | } | |
41 | ||
fe31edc8 | 42 | static const struct ide_port_info rz1000_chipset = { |
ced3ec8a | 43 | .name = DRV_NAME, |
5e71d9c5 | 44 | .host_flags = IDE_HFLAG_NO_DMA, |
1da177e4 LT |
45 | }; |
46 | ||
fe31edc8 | 47 | static int rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
1da177e4 | 48 | { |
7f1ac8c4 BZ |
49 | struct ide_port_info d = rz1000_chipset; |
50 | int rc; | |
51 | ||
52 | rc = pci_enable_device(dev); | |
53 | if (rc) | |
54 | return rc; | |
55 | ||
56 | if (rz1000_disable_readahead(dev)) { | |
57 | d.host_flags |= IDE_HFLAG_SERIALIZE; | |
58 | d.host_flags |= IDE_HFLAG_NO_UNMASK_IRQS; | |
59 | } | |
60 | ||
61 | return ide_pci_init_one(dev, &d, NULL); | |
62 | } | |
63 | ||
64 | static void rz1000_remove(struct pci_dev *dev) | |
65 | { | |
66 | ide_pci_remove(dev); | |
67 | pci_disable_device(dev); | |
1da177e4 LT |
68 | } |
69 | ||
9cbcc5e3 BZ |
70 | static const struct pci_device_id rz1000_pci_tbl[] = { |
71 | { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 }, | |
72 | { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 }, | |
1da177e4 LT |
73 | { 0, }, |
74 | }; | |
75 | MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl); | |
76 | ||
a9ab09e2 | 77 | static struct pci_driver rz1000_pci_driver = { |
1da177e4 LT |
78 | .name = "RZ1000_IDE", |
79 | .id_table = rz1000_pci_tbl, | |
80 | .probe = rz1000_init_one, | |
7f1ac8c4 | 81 | .remove = rz1000_remove, |
1da177e4 LT |
82 | }; |
83 | ||
82ab1eec | 84 | static int __init rz1000_ide_init(void) |
1da177e4 | 85 | { |
a9ab09e2 | 86 | return ide_pci_register_driver(&rz1000_pci_driver); |
1da177e4 LT |
87 | } |
88 | ||
0fd18804 BZ |
89 | static void __exit rz1000_ide_exit(void) |
90 | { | |
a9ab09e2 | 91 | pci_unregister_driver(&rz1000_pci_driver); |
0fd18804 BZ |
92 | } |
93 | ||
1da177e4 | 94 | module_init(rz1000_ide_init); |
0fd18804 | 95 | module_exit(rz1000_ide_exit); |
1da177e4 LT |
96 | |
97 | MODULE_AUTHOR("Andre Hedrick"); | |
98 | MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE"); | |
99 | MODULE_LICENSE("GPL"); | |
100 |