LXR linux/drivers/ata/pata

   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
  36static 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
  52static struct scsi_host_template rz1000_sht = {
  53        ATA_PIO_SHT(DRV_NAME),
  54};
  55
  56static 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
  62static 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
  85static 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
 105static 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
 124static 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
 131static 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
 142module_pci_driver(rz1000_pci_driver);
 143
 144MODULE_AUTHOR("Alan Cox");
 145MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
 146MODULE_LICENSE("GPL");
 147MODULE_DEVICE_TABLE(pci, pata_rz1000);
 148MODULE_VERSION(DRV_VERSION);
 149