Root/drivers/pcmcia/cardbus.c

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

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