/*
   *  RZ1000/1001 driver based upon
   *
   *  linux/drivers/ide/pci/rz1000.c	Version 0.06	January 12, 2003
   *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
   *  Principal Author:  mlord@pobox.com (Mark Lord)
   *
   *  See linux/MAINTAINERS for address of current maintainer.
   *
   *  This file provides support for disabling the buggy read-ahead
   *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/pci.h>
  #include <linux/init.h>
  #include <linux/blkdev.h>
  #include <linux/delay.h>
  #include <scsi/scsi_host.h>
  #include <linux/libata.h>
  
  #define DRV_NAME	"pata_rz1000"

  #define DRV_VERSION	"0.2.4"

  
  
  /**

   *	rz1000_set_mode		-	mode setting function

   *	@link: ATA link

   *	@unused: returned device on set_mode failure

   *
   *	Use a non standard set_mode function. We don't want to be tuned. We
   *	would prefer to be BIOS generic but for the fact our hardware is
   *	whacked out.
   */

  static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)

  {

  	struct ata_device *dev;

  	ata_for_each_dev(dev, link, ENABLED) {
  		/* We don't really care */
  		dev->pio_mode = XFER_PIO_0;
  		dev->xfer_mode = XFER_PIO_0;
  		dev->xfer_shift = ATA_SHIFT_PIO;
  		dev->flags |= ATA_DFLAG_PIO;

  		ata_dev_info(dev, "configured for PIO
  ");

  	}

  	return 0;

  }
  
  
  static struct scsi_host_template rz1000_sht = {

  	ATA_PIO_SHT(DRV_NAME),

  };
  
  static struct ata_port_operations rz1000_port_ops = {

  	.inherits	= &ata_sff_port_ops,

  	.cable_detect	= ata_cable_40wire,

  	.set_mode	= rz1000_set_mode,

  };

  static int rz1000_fifo_disable(struct pci_dev *pdev)
  {
  	u16 reg;
  	/* Be exceptionally paranoid as we must be sure to apply the fix */
  	if (pci_read_config_word(pdev, 0x40, &reg) != 0)
  		return -1;
  	reg &= 0xDFFF;
  	if (pci_write_config_word(pdev, 0x40, reg) != 0)
  		return -1;
  	printk(KERN_INFO DRV_NAME ": disabled chipset readahead.
  ");
  	return 0;
  }

  /**
   *	rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
   *	@pdev: PCI device to register
   *	@ent: Entry in rz1000_pci_tbl matching with @pdev
   *
   *	Configure an RZ1000 interface. This doesn't require much special
   *	handling except that we *MUST* kill the chipset readahead or the
   *	user may experience data corruption.
   */
  
  static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
  {

  	static const struct ata_port_info info = {

  		.flags = ATA_FLAG_SLAVE_POSS,

  		.pio_mask = ATA_PIO4,

  		.port_ops = &rz1000_port_ops
  	};

  	const struct ata_port_info *ppi[] = { &info, NULL };

  	ata_print_version_once(&pdev->dev, DRV_VERSION);

  	if (rz1000_fifo_disable(pdev) == 0)

  		return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0);

  	printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..
  ");
  	/* Not safe to use so skip */
  	return -ENODEV;
  }

  #ifdef CONFIG_PM

  static int rz1000_reinit_one(struct pci_dev *pdev)
  {

  	struct ata_host *host = dev_get_drvdata(&pdev->dev);
  	int rc;
  
  	rc = ata_pci_device_do_resume(pdev);
  	if (rc)
  		return rc;

  	/* If this fails on resume (which is a "can't happen" case), we

  	   must stop as any progress risks data loss */
  	if (rz1000_fifo_disable(pdev))
  		panic("rz1000 fifo");

  
  	ata_host_resume(host);
  	return 0;

  }

  #endif

  static const struct pci_device_id pata_rz1000[] = {
  	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
  	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
  
  	{ },

  };
  
  static struct pci_driver rz1000_pci_driver = {

  	.name 		= DRV_NAME,

  	.id_table	= pata_rz1000,
  	.probe 		= rz1000_init_one,

  	.remove		= ata_pci_remove_one,

  #ifdef CONFIG_PM

  	.suspend	= ata_pci_device_suspend,
  	.resume		= rz1000_reinit_one,

  #endif

  };

  static int __init rz1000_init(void)
  {
  	return pci_register_driver(&rz1000_pci_driver);
  }
  
  static void __exit rz1000_exit(void)
  {
  	pci_unregister_driver(&rz1000_pci_driver);
  }
  
  MODULE_AUTHOR("Alan Cox");
  MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
  MODULE_LICENSE("GPL");
  MODULE_DEVICE_TABLE(pci, pata_rz1000);
  MODULE_VERSION(DRV_VERSION);
  
  module_init(rz1000_init);
  module_exit(rz1000_exit);