projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| 1da177e4 LT |
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 | ||
| 1da177e4 LT |
16 | #include <linux/types.h> |
| 17 | #include <linux/module.h> | |
| 18 | #include <linux/kernel.h> | |
| 1da177e4 LT |
19 | #include <linux/pci.h> |
| 20 | #include <linux/ide.h> | |
| 21 | #include <linux/init.h> | |
| 22 | ||
| ced3ec8a BZ |
23 | #define DRV_NAME "rz1000" |
| 24 | ||
| fe31edc8 | 25 | static int rz1000_disable_readahead(struct pci_dev *dev) |
| 1da177e4 LT |
26 | { |
| 27 | u16 reg; | |
| 1da177e4 | 28 | |
| 1da177e4 LT |
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 " | |
| 7f1ac8c4 BZ |
32 | "(buggy RZ1000/RZ1001)\n", pci_name(dev)); |
| 33 | return 0; | |
| 1da177e4 | 34 | } else { |
| 1da177e4 | 35 | printk(KERN_INFO "%s: serialized, disabled unmasking " |
| 7f1ac8c4 BZ |
36 | "(buggy RZ1000/RZ1001)\n", pci_name(dev)); |
| 37 | return 1; | |
| 1da177e4 LT |
38 | } |
| 39 | } | |
| 40 | ||
| fe31edc8 | 41 | static const struct ide_port_info rz1000_chipset = { |
| ced3ec8a | 42 | .name = DRV_NAME, |
| 5e71d9c5 | 43 | .host_flags = IDE_HFLAG_NO_DMA, |
| 1da177e4 LT |
44 | }; |
| 45 | ||
| fe31edc8 | 46 | static int rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
| 1da177e4 | 47 | { |
| 7f1ac8c4 BZ |
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); | |
| 1da177e4 LT |
67 | } |
| 68 | ||
| 9cbcc5e3 BZ |
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 }, | |
| 1da177e4 LT |
72 | { 0, }, |
| 73 | }; | |
| 74 | MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl); | |
| 75 | ||
| a9ab09e2 | 76 | static struct pci_driver rz1000_pci_driver = { |
| 1da177e4 LT |
77 | .name = "RZ1000_IDE", |
| 78 | .id_table = rz1000_pci_tbl, | |
| 79 | .probe = rz1000_init_one, | |
| 7f1ac8c4 | 80 | .remove = rz1000_remove, |
| 1da177e4 LT |
81 | }; |
| 82 | ||
| 82ab1eec | 83 | static int __init rz1000_ide_init(void) |
| 1da177e4 | 84 | { |
| a9ab09e2 | 85 | return ide_pci_register_driver(&rz1000_pci_driver); |
| 1da177e4 LT |
86 | } |
| 87 | ||
| 0fd18804 BZ |
88 | static void __exit rz1000_ide_exit(void) |
| 89 | { | |
| a9ab09e2 | 90 | pci_unregister_driver(&rz1000_pci_driver); |
| 0fd18804 BZ |
91 | } |
| 92 | ||
| 1da177e4 | 93 | module_init(rz1000_ide_init); |
| 0fd18804 | 94 | module_exit(rz1000_ide_exit); |
| 1da177e4 LT |
95 | |
| 96 | MODULE_AUTHOR("Andre Hedrick"); | |
| 97 | MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE"); | |
| 98 | MODULE_LICENSE("GPL"); | |
| 99 |