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 pci_lock_rescan_remove();
74
75 s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
76 pci_fixup_cardbus(bus);
77
78 max = bus->busn_res.start;
79 for (pass = 0; pass < 2; pass++)
80 for_each_pci_bridge(dev, bus)
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_bus_add_devices(bus);
95
96 pci_unlock_rescan_remove();
97 return 0;
98}
99
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 */
106void cb_free(struct pcmcia_socket *s)
107{
108 struct pci_dev *bridge, *dev, *tmp;
109 struct pci_bus *bus;
110
111 bridge = s->cb_dev;
112 if (!bridge)
113 return;
114
115 bus = bridge->subordinate;
116 if (!bus)
117 return;
118
119 pci_lock_rescan_remove();
120
121 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list)
122 pci_stop_and_remove_bus_device(dev);
123
124 pci_unlock_rescan_remove();
125}
126