cardbus.c revision 6e83ee075ed74941ccaad4fec503f6b24646e7e0 
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
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/pci.h>
26
27#include <pcmcia/ss.h>
28
29
30static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq)
31{
32	struct pci_dev *dev;
33
34	list_for_each_entry(dev, &bus->devices, bus_list) {
35		u8 irq_pin;
36
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		 */
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
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
55		if (dev->subordinate)
56			cardbus_config_irq_and_cls(dev->subordinate, irq);
57	}
58}
59
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 */
67int __ref cb_alloc(struct pcmcia_socket *s)
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));
74	pci_fixup_cardbus(bus);
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);
88	cardbus_config_irq_and_cls(bus, s->pci_irq);
89
90	/* socket specific tune function */
91	if (s->tune_bridge)
92		s->tune_bridge(s, bus);
93
94	pci_enable_bridges(bus);
95	pci_bus_add_devices(bus);
96
97	s->irq.AssignedIRQ = s->pci_irq;
98	return 0;
99}
100
101/**
102 * cb_free() - remove CardBus device
103 * @s:		the pcmcia_socket where the CardBus device was located
104 *
105 * cb_free() handles the lowest level PCI device cleanup.
106 */
107void cb_free(struct pcmcia_socket *s)
108{
109	struct pci_dev *bridge = s->cb_dev;
110
111	if (bridge)
112		pci_remove_behind_bridge(bridge);
113}
114