linux/drivers/ata/pata_rz1000.c
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   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
  37static 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
  53static struct scsi_host_template rz1000_sht = {
  54        ATA_PIO_SHT(DRV_NAME),
  55};
  56
  57static 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
  63static 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, &reg) != 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
  86static 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        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
 106static int rz1000_reinit_one(struct pci_dev *pdev)
 107{
 108        struct ata_host *host = dev_get_drvdata(&pdev->dev);
 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
 125static 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
 132static 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
 138        .suspend        = ata_pci_device_suspend,
 139        .resume         = rz1000_reinit_one,
 140#endif
 141};
 142
 143module_pci_driver(rz1000_pci_driver);
 144
 145MODULE_AUTHOR("Alan Cox");
 146MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
 147MODULE_LICENSE("GPL");
 148MODULE_DEVICE_TABLE(pci, pata_rz1000);
 149MODULE_VERSION(DRV_VERSION);
 150
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