| | 1 | /* |
| | 2 | * RZ1000/1001 driver based upon |
| | 3 | * |
| | 4 | * linux/drivers/ide/pci/rz1000.c Version 0.06 January 12, 2003 |
| | 5 | * Copyright (C) 1995-1998 Linus Torvalds & author (see below) |
| | 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 | |
| | 14 | #include <linux/kernel.h> |
| | 15 | #include <linux/module.h> |
| | 16 | #include <linux/pci.h> |
| | 17 | #include <linux/init.h> |
| | 18 | #include <linux/blkdev.h> |
| | 19 | #include <linux/delay.h> |
| | 20 | #include <scsi/scsi_host.h> |
| | 21 | #include <linux/libata.h> |
| | 22 | |
| | 23 | #define DRV_NAME "pata_rz1000" |
| | 24 | #define DRV_VERSION "0.2.4" |
| | 25 | |
| | 26 | |
| | 27 | /** |
| | 28 | * rz1000_set_mode - mode setting function |
| | 29 | * @link: ATA link |
| | 30 | * @unused: returned device on set_mode failure |
| | 31 | * |
| | 32 | * Use a non standard set_mode function. We don't want to be tuned. We |
| | 33 | * would prefer to be BIOS generic but for the fact our hardware is |
| | 34 | * whacked out. |
| | 35 | */ |
| | 36 | |
| | 37 | static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused) |
| | 38 | { |
| | 39 | struct ata_device *dev; |
| | 40 | |
| | 41 | ata_for_each_dev(dev, link, ENABLED) { |
| | 42 | /* We don't really care */ |
| | 43 | dev->pio_mode = XFER_PIO_0; |
| | 44 | dev->xfer_mode = XFER_PIO_0; |
| | 45 | dev->xfer_shift = ATA_SHIFT_PIO; |
| | 46 | dev->flags |= ATA_DFLAG_PIO; |
| | 47 | ata_dev_printk(dev, KERN_INFO, "configured for PIO\n"); |
| | 48 | } |
| | 49 | return 0; |
| | 50 | } |
| | 51 | |
| | 52 | |
| | 53 | static struct scsi_host_template rz1000_sht = { |
| | 54 | ATA_PIO_SHT(DRV_NAME), |
| | 55 | }; |
| | 56 | |
| | 57 | static struct ata_port_operations rz1000_port_ops = { |
| | 58 | .inherits = &ata_sff_port_ops, |
| | 59 | .cable_detect = ata_cable_40wire, |
| | 60 | .set_mode = rz1000_set_mode, |
| | 61 | }; |
| | 62 | |
| | 63 | static int rz1000_fifo_disable(struct pci_dev *pdev) |
| | 64 | { |
| | 65 | u16 reg; |
| | 66 | /* Be exceptionally paranoid as we must be sure to apply the fix */ |
| | 67 | if (pci_read_config_word(pdev, 0x40, ®) != 0) |
| | 68 | return -1; |
| | 69 | reg &= 0xDFFF; |
| | 70 | if (pci_write_config_word(pdev, 0x40, reg) != 0) |
| | 71 | return -1; |
| | 72 | printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n"); |
| | 73 | return 0; |
| | 74 | } |
| | 75 | |
| | 76 | /** |
| | 77 | * rz1000_init_one - Register RZ1000 ATA PCI device with kernel services |
| | 78 | * @pdev: PCI device to register |
| | 79 | * @ent: Entry in rz1000_pci_tbl matching with @pdev |
| | 80 | * |
| | 81 | * Configure an RZ1000 interface. This doesn't require much special |
| | 82 | * handling except that we *MUST* kill the chipset readahead or the |
| | 83 | * user may experience data corruption. |
| | 84 | */ |
| | 85 | |
| | 86 | static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) |
| | 87 | { |
| | 88 | static int printed_version; |
| | 89 | static const struct ata_port_info info = { |
| | 90 | .flags = ATA_FLAG_SLAVE_POSS, |
| | 91 | .pio_mask = 0x1f, |
| | 92 | .port_ops = &rz1000_port_ops |
| | 93 | }; |
| | 94 | const struct ata_port_info *ppi[] = { &info, NULL }; |
| | 95 | |
| | 96 | if (!printed_version++) |
| | 97 | printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n"); |
| | 98 | |
| | 99 | if (rz1000_fifo_disable(pdev) == 0) |
| | 100 | return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL); |
| | 101 | |
| | 102 | printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n"); |
| | 103 | /* Not safe to use so skip */ |
| | 104 | return -ENODEV; |
| | 105 | } |
| | 106 | |
| | 107 | #ifdef CONFIG_PM |
| | 108 | static int rz1000_reinit_one(struct pci_dev *pdev) |
| | 109 | { |
| | 110 | /* If this fails on resume (which is a "cant happen" case), we |
| | 111 | must stop as any progress risks data loss */ |
| | 112 | if (rz1000_fifo_disable(pdev)) |
| | 113 | panic("rz1000 fifo"); |
| | 114 | return ata_pci_device_resume(pdev); |
| | 115 | } |
| | 116 | #endif |
| | 117 | |
| | 118 | static const struct pci_device_id pata_rz1000[] = { |
| | 119 | { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), }, |
| | 120 | { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), }, |
| | 121 | |
| | 122 | { }, |
| | 123 | }; |
| | 124 | |
| | 125 | static struct pci_driver rz1000_pci_driver = { |
| | 126 | .name = DRV_NAME, |
| | 127 | .id_table = pata_rz1000, |
| | 128 | .probe = rz1000_init_one, |
| | 129 | .remove = ata_pci_remove_one, |
| | 130 | #ifdef CONFIG_PM |
| | 131 | .suspend = ata_pci_device_suspend, |
| | 132 | .resume = rz1000_reinit_one, |
| | 133 | #endif |
| | 134 | }; |
| | 135 | |
| | 136 | static int __init rz1000_init(void) |
| | 137 | { |
| | 138 | return pci_register_driver(&rz1000_pci_driver); |
| | 139 | } |
| | 140 | |
| | 141 | static void __exit rz1000_exit(void) |
| | 142 | { |
| | 143 | pci_unregister_driver(&rz1000_pci_driver); |
| | 144 | } |
| | 145 | |
| | 146 | MODULE_AUTHOR("Alan Cox"); |
| | 147 | MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA"); |
| | 148 | MODULE_LICENSE("GPL"); |
| | 149 | MODULE_DEVICE_TABLE(pci, pata_rz1000); |
| | 150 | MODULE_VERSION(DRV_VERSION); |
| | 151 | |
| | 152 | module_init(rz1000_init); |
| | 153 | module_exit(rz1000_exit); |
| | 154 | |
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