[mirror_ubuntu-zesty-kernel.git] / drivers / pcmcia / cardbus.c

/*
 * 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);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* cardbus.c -- 16-bit PCMCIA core support
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* The initial developer of the original code is David A. Hinds
	9	* <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
	10	* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
	11	*
	12	* (C) 1999 David A. Hinds
	13	*/
	14
	15	/*
	16	* Cardbus handling has been re-written to be more of a PCI bridge thing,
	17	* and the PCI code basically does all the resource handling.
	18	*
	19	* Linus, Jan 2000
	20	*/
	21
	22
1da177e4	23	#include <linux/kernel.h>
57197b9b	24	#include <linux/module.h>
1da177e4	25	#include <linux/pci.h>
1da177e4	26
1da177e4	27	#include <pcmcia/ss.h>
1da177e4	28
1da177e4	29
15ea76d4	30	static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq)
1da177e4 LT	31	{
	32	struct pci_dev *dev;
	33
	34	list_for_each_entry(dev, &bus->devices, bus_list) {
	35	u8 irq_pin;
	36
15ea76d4 TH	37	/*
	38	* Since there is only one interrupt available to
	39	* CardBus devices, all devices downstream of this
	40	* device must be using this IRQ.
	41	*/
1da177e4 LT	42	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin);
	43	if (irq_pin) {
	44	dev->irq = irq;
	45	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
	46	}
	47
15ea76d4 TH	48	/*
	49	* Some controllers transfer very slowly with 0 CLS.
	50	* Configure it. This may fail as CLS configuration
	51	* is mandatory only for MWI.
	52	*/
	53	pci_set_cacheline_size(dev);
	54
1da177e4	55	if (dev->subordinate)
15ea76d4	56	cardbus_config_irq_and_cls(dev->subordinate, irq);
1da177e4 LT	57	}
	58	}
	59
57197b9b DB	60	/**
	61	* cb_alloc() - add CardBus device
	62	* @s: the pcmcia_socket where the CardBus device is located
	63	*
	64	* cb_alloc() allocates the kernel data structures for a Cardbus device
	65	* and handles the lowest level PCI device setup issues.
	66	*/
9fea84f4	67	int __ref cb_alloc(struct pcmcia_socket *s)
1da177e4 LT	68	{
	69	struct pci_bus *bus = s->cb_dev->subordinate;
	70	struct pci_dev *dev;
	71	unsigned int max, pass;
	72
	73	s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
6e83ee07	74	pci_fixup_cardbus(bus);
1da177e4 LT	75
	76	max = bus->secondary;
	77	for (pass = 0; pass < 2; pass++)
	78	list_for_each_entry(dev, &bus->devices, bus_list)
	79	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE \|\|
	80	dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
	81	max = pci_scan_bridge(bus, dev, max, pass);
	82
	83	/*
	84	* Size all resources below the CardBus controller.
	85	*/
	86	pci_bus_size_bridges(bus);
	87	pci_bus_assign_resources(bus);
15ea76d4	88	cardbus_config_irq_and_cls(bus, s->pci_irq);
8c3520d4 DR	89
	90	/* socket specific tune function */
	91	if (s->tune_bridge)
	92	s->tune_bridge(s, bus);
	93
1da177e4 LT	94	pci_enable_bridges(bus);
	95	pci_bus_add_devices(bus);
	96
4c89e88b	97	return 0;
1da177e4 LT	98	}
1da177e4 LT	99
57197b9b DB	100	/**
	101	* cb_free() - remove CardBus device
	102	* @s: the pcmcia_socket where the CardBus device was located
	103	*
	104	* cb_free() handles the lowest level PCI device cleanup.
	105	*/
9fea84f4	106	void cb_free(struct pcmcia_socket *s)
1da177e4 LT	107	{
	108	struct pci_dev *bridge = s->cb_dev;
	109
1da177e4 LT	110	if (bridge)
	111	pci_remove_behind_bridge(bridge);
	112	}