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/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, &reg) != 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);