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 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 printk_once(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n"); 96 97 if (rz1000_fifo_disable(pdev) == 0) 98 return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL); 99 100 printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n"); 101 /* Not safe to use so skip */ 102 return -ENODEV; 103 } 104 105 #ifdef CONFIG_PM 106 static int rz1000_reinit_one(struct pci_dev *pdev) 107 { 108 /* If this fails on resume (which is a "cant happen" case), we 109 must stop as any progress risks data loss */ 110 if (rz1000_fifo_disable(pdev)) 111 panic("rz1000 fifo"); 112 return ata_pci_device_resume(pdev); 113 } 114 #endif 115 116 static const struct pci_device_id pata_rz1000[] = { 117 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), }, 118 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), }, 119 120 { }, 121 }; 122 123 static struct pci_driver rz1000_pci_driver = { 124 .name = DRV_NAME, 125 .id_table = pata_rz1000, 126 .probe = rz1000_init_one, 127 .remove = ata_pci_remove_one, 128 #ifdef CONFIG_PM 129 .suspend = ata_pci_device_suspend, 130 .resume = rz1000_reinit_one, 131 #endif 132 }; 133 134 static int __init rz1000_init(void) 135 { 136 return pci_register_driver(&rz1000_pci_driver); 137 } 138 139 static void __exit rz1000_exit(void) 140 { 141 pci_unregister_driver(&rz1000_pci_driver); 142 } 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); 149 150 module_init(rz1000_init); 151 module_exit(rz1000_exit); 152 153