/*
   * cardbus.c -- 16-bit PCMCIA core support
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * The initial developer of the original code is David A. Hinds
   * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
   * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
   *
   * (C) 1999		David A. Hinds
   */
  
  /*
   * Cardbus handling has been re-written to be more of a PCI bridge thing,
   * and the PCI code basically does all the resource handling.
   *
   *		Linus, Jan 2000
   */

  #include <linux/kernel.h>

  #include <linux/module.h>

  #include <linux/pci.h>

  #include <pcmcia/ss.h>

  static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq)

  {
  	struct pci_dev *dev;
  
  	list_for_each_entry(dev, &bus->devices, bus_list) {
  		u8 irq_pin;

  		/*
  		 * Since there is only one interrupt available to
  		 * CardBus devices, all devices downstream of this
  		 * device must be using this IRQ.
  		 */

  		pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin);
  		if (irq_pin) {
  			dev->irq = irq;
  			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
  		}

  		/*
  		 * Some controllers transfer very slowly with 0 CLS.
  		 * Configure it.  This may fail as CLS configuration
  		 * is mandatory only for MWI.
  		 */
  		pci_set_cacheline_size(dev);

  		if (dev->subordinate)

  			cardbus_config_irq_and_cls(dev->subordinate, irq);

  	}
  }

  /**
   * cb_alloc() - add CardBus device
   * @s:		the pcmcia_socket where the CardBus device is located
   *
   * cb_alloc() allocates the kernel data structures for a Cardbus device
   * and handles the lowest level PCI device setup issues.
   */

  int __ref cb_alloc(struct pcmcia_socket *s)

  {
  	struct pci_bus *bus = s->cb_dev->subordinate;
  	struct pci_dev *dev;
  	unsigned int max, pass;
  
  	s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));

  	pci_fixup_cardbus(bus);

  
  	max = bus->secondary;
  	for (pass = 0; pass < 2; pass++)
  		list_for_each_entry(dev, &bus->devices, bus_list)
  			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
  			    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
  				max = pci_scan_bridge(bus, dev, max, pass);
  
  	/*
  	 * Size all resources below the CardBus controller.
  	 */
  	pci_bus_size_bridges(bus);
  	pci_bus_assign_resources(bus);

  	cardbus_config_irq_and_cls(bus, s->pci_irq);

  
  	/* socket specific tune function */
  	if (s->tune_bridge)
  		s->tune_bridge(s, bus);

  	pci_enable_bridges(bus);
  	pci_bus_add_devices(bus);

  	return 0;

  }

  /**
   * cb_free() - remove CardBus device
   * @s:		the pcmcia_socket where the CardBus device was located
   *
   * cb_free() handles the lowest level PCI device cleanup.
   */

  void cb_free(struct pcmcia_socket *s)

  {
  	struct pci_dev *bridge = s->cb_dev;

  	if (bridge)
  		pci_remove_behind_bridge(bridge);
  }