| 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 __devinit 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 __devinitdata = { |
| 42 | .name = DRV_NAME, |
| 43 | .host_flags = IDE_HFLAG_NO_DMA, |
| 44 | }; |
| 45 | |
| 46 | static int __devinit 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 | |