| 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/blkdev.h> |
| 18 | #include <linux/delay.h> |
| 19 | #include <scsi/scsi_host.h> |
| 20 | #include <linux/libata.h> |
| 21 | |
| 22 | #define DRV_NAME "pata_rz1000" |
| 23 | #define DRV_VERSION "0.2.4" |
| 24 | |
| 25 | |
| 26 | /** |
| 27 | * rz1000_set_mode - mode setting function |
| 28 | * @link: ATA link |
| 29 | * @unused: returned device on set_mode failure |
| 30 | * |
| 31 | * Use a non standard set_mode function. We don't want to be tuned. We |
| 32 | * would prefer to be BIOS generic but for the fact our hardware is |
| 33 | * whacked out. |
| 34 | */ |
| 35 | |
| 36 | static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused) |
| 37 | { |
| 38 | struct ata_device *dev; |
| 39 | |
| 40 | ata_for_each_dev(dev, link, ENABLED) { |
| 41 | /* We don't really care */ |
| 42 | dev->pio_mode = XFER_PIO_0; |
| 43 | dev->xfer_mode = XFER_PIO_0; |
| 44 | dev->xfer_shift = ATA_SHIFT_PIO; |
| 45 | dev->flags |= ATA_DFLAG_PIO; |
| 46 | ata_dev_info(dev, "configured for PIO\n"); |
| 47 | } |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | |
| 52 | static struct scsi_host_template rz1000_sht = { |
| 53 | ATA_PIO_SHT(DRV_NAME), |
| 54 | }; |
| 55 | |
| 56 | static struct ata_port_operations rz1000_port_ops = { |
| 57 | .inherits = &ata_sff_port_ops, |
| 58 | .cable_detect = ata_cable_40wire, |
| 59 | .set_mode = rz1000_set_mode, |
| 60 | }; |
| 61 | |
| 62 | static int rz1000_fifo_disable(struct pci_dev *pdev) |
| 63 | { |
| 64 | u16 reg; |
| 65 | /* Be exceptionally paranoid as we must be sure to apply the fix */ |
| 66 | if (pci_read_config_word(pdev, 0x40, ®) != 0) |
| 67 | return -1; |
| 68 | reg &= 0xDFFF; |
| 69 | if (pci_write_config_word(pdev, 0x40, reg) != 0) |
| 70 | return -1; |
| 71 | printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n"); |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * rz1000_init_one - Register RZ1000 ATA PCI device with kernel services |
| 77 | * @pdev: PCI device to register |
| 78 | * @ent: Entry in rz1000_pci_tbl matching with @pdev |
| 79 | * |
| 80 | * Configure an RZ1000 interface. This doesn't require much special |
| 81 | * handling except that we *MUST* kill the chipset readahead or the |
| 82 | * user may experience data corruption. |
| 83 | */ |
| 84 | |
| 85 | static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) |
| 86 | { |
| 87 | static const struct ata_port_info info = { |
| 88 | .flags = ATA_FLAG_SLAVE_POSS, |
| 89 | .pio_mask = ATA_PIO4, |
| 90 | .port_ops = &rz1000_port_ops |
| 91 | }; |
| 92 | const struct ata_port_info *ppi[] = { &info, NULL }; |
| 93 | |
| 94 | ata_print_version_once(&pdev->dev, DRV_VERSION); |
| 95 | |
| 96 | if (rz1000_fifo_disable(pdev) == 0) |
| 97 | return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0); |
| 98 | |
| 99 | printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n"); |
| 100 | /* Not safe to use so skip */ |
| 101 | return -ENODEV; |
| 102 | } |
| 103 | |
| 104 | #ifdef CONFIG_PM_SLEEP |
| 105 | static int rz1000_reinit_one(struct pci_dev *pdev) |
| 106 | { |
| 107 | struct ata_host *host = pci_get_drvdata(pdev); |
| 108 | int rc; |
| 109 | |
| 110 | rc = ata_pci_device_do_resume(pdev); |
| 111 | if (rc) |
| 112 | return rc; |
| 113 | |
| 114 | /* If this fails on resume (which is a "can't happen" case), we |
| 115 | must stop as any progress risks data loss */ |
| 116 | if (rz1000_fifo_disable(pdev)) |
| 117 | panic("rz1000 fifo"); |
| 118 | |
| 119 | ata_host_resume(host); |
| 120 | return 0; |
| 121 | } |
| 122 | #endif |
| 123 | |
| 124 | static const struct pci_device_id pata_rz1000[] = { |
| 125 | { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), }, |
| 126 | { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), }, |
| 127 | |
| 128 | { }, |
| 129 | }; |
| 130 | |
| 131 | static struct pci_driver rz1000_pci_driver = { |
| 132 | .name = DRV_NAME, |
| 133 | .id_table = pata_rz1000, |
| 134 | .probe = rz1000_init_one, |
| 135 | .remove = ata_pci_remove_one, |
| 136 | #ifdef CONFIG_PM_SLEEP |
| 137 | .suspend = ata_pci_device_suspend, |
| 138 | .resume = rz1000_reinit_one, |
| 139 | #endif |
| 140 | }; |
| 141 | |
| 142 | module_pci_driver(rz1000_pci_driver); |
| 143 | |
| 144 | MODULE_AUTHOR("Alan Cox"); |
| 145 | MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA"); |
| 146 | MODULE_LICENSE("GPL"); |
| 147 | MODULE_DEVICE_TABLE(pci, pata_rz1000); |
| 148 | MODULE_VERSION(DRV_VERSION); |