1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * RZ1000/1001 driver based upon 4 * 5 * linux/drivers/ide/pci/rz1000.c Version 0.06 January 12, 2003 6 * Copyright (C) 1995-1998 Linus Torvalds & author (see below) 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 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/pci.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_info(dev, "configured for PIO\n"); 48 } 49 return 0; 50 } 51 52 53 static const 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 dev_info(&pdev->dev, "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 const struct ata_port_info info = { 89 .flags = ATA_FLAG_SLAVE_POSS, 90 .pio_mask = ATA_PIO4, 91 .port_ops = &rz1000_port_ops 92 }; 93 const struct ata_port_info *ppi[] = { &info, NULL }; 94 95 ata_print_version_once(&pdev->dev, DRV_VERSION); 96 97 if (rz1000_fifo_disable(pdev) == 0) 98 return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0); 99 100 dev_err(&pdev->dev, "failed to disable read-ahead on chipset.\n"); 101 /* Not safe to use so skip */ 102 return -ENODEV; 103 } 104 105 #ifdef CONFIG_PM_SLEEP 106 static int rz1000_reinit_one(struct pci_dev *pdev) 107 { 108 struct ata_host *host = pci_get_drvdata(pdev); 109 int rc; 110 111 rc = ata_pci_device_do_resume(pdev); 112 if (rc) 113 return rc; 114 115 /* If this fails on resume (which is a "can't happen" case), we 116 must stop as any progress risks data loss */ 117 if (rz1000_fifo_disable(pdev)) 118 panic("rz1000 fifo"); 119 120 ata_host_resume(host); 121 return 0; 122 } 123 #endif 124 125 static const struct pci_device_id pata_rz1000[] = { 126 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), }, 127 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), }, 128 129 { }, 130 }; 131 132 static struct pci_driver rz1000_pci_driver = { 133 .name = DRV_NAME, 134 .id_table = pata_rz1000, 135 .probe = rz1000_init_one, 136 .remove = ata_pci_remove_one, 137 #ifdef CONFIG_PM_SLEEP 138 .suspend = ata_pci_device_suspend, 139 .resume = rz1000_reinit_one, 140 #endif 141 }; 142 143 module_pci_driver(rz1000_pci_driver); 144 145 MODULE_AUTHOR("Alan Cox"); 146 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA"); 147 MODULE_LICENSE("GPL"); 148 MODULE_DEVICE_TABLE(pci, pata_rz1000); 149 MODULE_VERSION(DRV_VERSION); 150