/*
   *   pata-isapnp.c - ISA PnP PATA controller driver.

   *   Copyright 2005/2006 Red Hat Inc, all rights reserved.

   *
   *   Based in part on ide-pnp.c by Andrey Panin <pazke@donpac.ru>
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/isapnp.h>
  #include <linux/init.h>
  #include <linux/blkdev.h>
  #include <linux/delay.h>
  #include <scsi/scsi_host.h>
  #include <linux/ata.h>
  #include <linux/libata.h>
  
  #define DRV_NAME "pata_isapnp"

  #define DRV_VERSION "0.2.5"

  
  static struct scsi_host_template isapnp_sht = {

  	ATA_PIO_SHT(DRV_NAME),

  };
  
  static struct ata_port_operations isapnp_port_ops = {

  	.inherits	= &ata_sff_port_ops,

  	.cable_detect	= ata_cable_40wire,

  };

  static struct ata_port_operations isapnp_noalt_port_ops = {
  	.inherits	= &ata_sff_port_ops,
  	.cable_detect	= ata_cable_40wire,
  	/* No altstatus so we don't want to use the lost interrupt poll */
  	.lost_interrupt = ATA_OP_NULL,
  };

  /**
   *	isapnp_init_one		-	attach an isapnp interface
   *	@idev: PnP device
   *	@dev_id: matching detect line
   *
   *	Register an ISA bus IDE interface. Such interfaces are PIO 0 and
   *	non shared IRQ.
   */
  
  static int isapnp_init_one(struct pnp_dev *idev, const struct pnp_device_id *dev_id)
  {

  	struct ata_host *host;
  	struct ata_port *ap;

  	void __iomem *cmd_addr, *ctl_addr;

  	int irq = 0;
  	irq_handler_t handler = NULL;

  
  	if (pnp_port_valid(idev, 0) == 0)
  		return -ENODEV;

  	if (pnp_irq_valid(idev, 0)) {
  		irq = pnp_irq(idev, 0);

  		handler = ata_sff_interrupt;

  	}

  	/* allocate host */
  	host = ata_host_alloc(&idev->dev, 1);
  	if (!host)
  		return -ENOMEM;
  
  	/* acquire resources and fill host */

  	cmd_addr = devm_ioport_map(&idev->dev, pnp_port_start(idev, 0), 8);
  	if (!cmd_addr)
  		return -ENOMEM;

  	ap = host->ports[0];

  	ap->ops = &isapnp_noalt_port_ops;

  	ap->pio_mask = ATA_PIO0;

  	ap->flags |= ATA_FLAG_SLAVE_POSS;
  
  	ap->ioaddr.cmd_addr = cmd_addr;

  	if (pnp_port_valid(idev, 1)) {

  		ctl_addr = devm_ioport_map(&idev->dev,
  					   pnp_port_start(idev, 1), 1);

  		ap->ioaddr.altstatus_addr = ctl_addr;
  		ap->ioaddr.ctl_addr = ctl_addr;

  		ap->ops = &isapnp_port_ops;

  	}

  	ata_sff_std_ports(&ap->ioaddr);

  	ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
  		      (unsigned long long)pnp_port_start(idev, 0),
  		      (unsigned long long)pnp_port_start(idev, 1));

  	/* activate */

  	return ata_host_activate(host, irq, handler, 0,

  				 &isapnp_sht);

  }
  
  /**
   *	isapnp_remove_one	-	unplug an isapnp interface
   *	@idev: PnP device
   *
   *	Remove a previously configured PnP ATA port. Called only on module
   *	unload events as the core does not currently deal with ISAPnP docking.
   */
  
  static void isapnp_remove_one(struct pnp_dev *idev)
  {
  	struct device *dev = &idev->dev;
  	struct ata_host *host = dev_get_drvdata(dev);

  	ata_host_detach(host);

  }
  
  static struct pnp_device_id isapnp_devices[] = {
    	/* Generic ESDI/IDE/ATA compatible hard disk controller */
  	{.id = "PNP0600", .driver_data = 0},
  	{.id = ""}
  };

  MODULE_DEVICE_TABLE(pnp, isapnp_devices);

  static struct pnp_driver isapnp_driver = {
  	.name		= DRV_NAME,
  	.id_table	= isapnp_devices,
  	.probe		= isapnp_init_one,
  	.remove		= isapnp_remove_one,
  };

  module_pnp_driver(isapnp_driver);

  MODULE_AUTHOR("Alan Cox");
  MODULE_DESCRIPTION("low-level driver for ISA PnP ATA");
  MODULE_LICENSE("GPL");
  MODULE_VERSION(DRV_VERSION);