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); 149