drivers/ata/pata_rz1000.c

   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_link_for_each_dev(dev, link) {
  42                 if (ata_dev_enabled(dev)) {
  43                         /* We don't really care */
  44                         dev->pio_mode = XFER_PIO_0;
  45                         dev->xfer_mode = XFER_PIO_0;
  46                         dev->xfer_shift = ATA_SHIFT_PIO;
  47                         dev->flags |= ATA_DFLAG_PIO;
  48                         ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
  49                 }
  50         }
  51         return 0;
  52 }
  53
  54
  55 static struct scsi_host_template rz1000_sht = {
  56         ATA_PIO_SHT(DRV_NAME),
  57 };
  58
  59 static struct ata_port_operations rz1000_port_ops = {
  60         .inherits       = &ata_sff_port_ops,
  61         .cable_detect   = ata_cable_40wire,
  62         .set_mode       = rz1000_set_mode,
  63 };
  64
  65 static int rz1000_fifo_disable(struct pci_dev *pdev)
  66 {
  67         u16 reg;
  68         /* Be exceptionally paranoid as we must be sure to apply the fix */
  69         if (pci_read_config_word(pdev, 0x40, &reg) != 0)
  70                 return -1;
  71         reg &= 0xDFFF;
  72         if (pci_write_config_word(pdev, 0x40, reg) != 0)
  73                 return -1;
  74         printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
  75         return 0;
  76 }
  77
  78 /**
  79  *      rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
  80  *      @pdev: PCI device to register
  81  *      @ent: Entry in rz1000_pci_tbl matching with @pdev
  82  *
  83  *      Configure an RZ1000 interface. This doesn't require much special
  84  *      handling except that we *MUST* kill the chipset readahead or the
  85  *      user may experience data corruption.
  86  */
  87
  88 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
  89 {
  90         static int printed_version;
  91         static const struct ata_port_info info = {
  92                 .sht = &rz1000_sht,
  93                 .flags = ATA_FLAG_SLAVE_POSS,
  94                 .pio_mask = 0x1f,
  95                 .port_ops = &rz1000_port_ops
  96         };
  97         const struct ata_port_info *ppi[] = { &info, NULL };
  98
  99         if (!printed_version++)
 100                 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
 101
 102         if (rz1000_fifo_disable(pdev) == 0)
 103                 return ata_pci_init_one(pdev, ppi);
 104
 105         printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
 106         /* Not safe to use so skip */
 107         return -ENODEV;
 108 }
 109
 110 #ifdef CONFIG_PM
 111 static int rz1000_reinit_one(struct pci_dev *pdev)
 112 {
 113         /* If this fails on resume (which is a "cant happen" case), we
 114            must stop as any progress risks data loss */
 115         if (rz1000_fifo_disable(pdev))
 116                 panic("rz1000 fifo");
 117         return ata_pci_device_resume(pdev);
 118 }
 119 #endif
 120
 121 static const struct pci_device_id pata_rz1000[] = {
 122         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
 123         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
 124
 125         { },
 126 };
 127
 128 static struct pci_driver rz1000_pci_driver = {
 129         .name           = DRV_NAME,
 130         .id_table       = pata_rz1000,
 131         .probe          = rz1000_init_one,
 132         .remove         = ata_pci_remove_one,
 133 #ifdef CONFIG_PM
 134         .suspend        = ata_pci_device_suspend,
 135         .resume         = rz1000_reinit_one,
 136 #endif
 137 };
 138
 139 static int __init rz1000_init(void)
 140 {
 141         return pci_register_driver(&rz1000_pci_driver);
 142 }
 143
 144 static void __exit rz1000_exit(void)
 145 {
 146         pci_unregister_driver(&rz1000_pci_driver);
 147 }
 148
 149 MODULE_AUTHOR("Alan Cox");
 150 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
 151 MODULE_LICENSE("GPL");
 152 MODULE_DEVICE_TABLE(pci, pata_rz1000);
 153 MODULE_VERSION(DRV_VERSION);
 154
 155 module_init(rz1000_init);
 156 module_exit(rz1000_exit);
 157