1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * cardbus.c -- 16-bit PCMCIA core support
4 *
5 * The initial developer of the original code is David A. Hinds
6 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
7 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
8 *
9 * (C) 1999 David A. Hinds
10 */
11
12/*
13 * Cardbus handling has been re-written to be more of a PCI bridge thing,
14 * and the PCI code basically does all the resource handling.
15 *
16 * Linus, Jan 2000
17 */
18
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/pci.h>
23
24#include <pcmcia/ss.h>
25#include <pcmcia/cistpl.h>
26
27#include "cs_internal.h"
28
29static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq)
30{
31 struct pci_dev *dev;
32
33 list_for_each_entry(dev, &bus->devices, bus_list) {
34 u8 irq_pin;
35
36 /*
37 * Since there is only one interrupt available to
38 * CardBus devices, all devices downstream of this
39 * device must be using this IRQ.
40 */
41 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, val: &irq_pin);
42 if (irq_pin) {
43 dev->irq = irq;
44 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, val: dev->irq);
45 }
46
47 /*
48 * Some controllers transfer very slowly with 0 CLS.
49 * Configure it. This may fail as CLS configuration
50 * is mandatory only for MWI.
51 */
52 pci_set_cacheline_size(dev);
53
54 if (dev->subordinate)
55 cardbus_config_irq_and_cls(bus: dev->subordinate, irq);
56 }
57}
58
59/**
60 * cb_alloc() - add CardBus device
61 * @s: the pcmcia_socket where the CardBus device is located
62 *
63 * cb_alloc() allocates the kernel data structures for a Cardbus device
64 * and handles the lowest level PCI device setup issues.
65 */
66int __ref cb_alloc(struct pcmcia_socket *s)
67{
68 struct pci_bus *bus = s->cb_dev->subordinate;
69 struct pci_dev *dev;
70 unsigned int max, pass;
71
72 pci_lock_rescan_remove();
73
74 s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
75
76 max = bus->busn_res.start;
77 for (pass = 0; pass < 2; pass++)
78 for_each_pci_bridge(dev, bus)
79 max = pci_scan_bridge(bus, dev, max, pass);
80
81 /*
82 * Size all resources below the CardBus controller.
83 */
84 pci_bus_size_bridges(bus);
85 pci_bus_assign_resources(bus);
86 cardbus_config_irq_and_cls(bus, irq: s->pci_irq);
87
88 /* socket specific tune function */
89 if (s->tune_bridge)
90 s->tune_bridge(s, bus);
91
92 pci_bus_add_devices(bus);
93
94 pci_unlock_rescan_remove();
95 return 0;
96}
97
98/**
99 * cb_free() - remove CardBus device
100 * @s: the pcmcia_socket where the CardBus device was located
101 *
102 * cb_free() handles the lowest level PCI device cleanup.
103 */
104void cb_free(struct pcmcia_socket *s)
105{
106 struct pci_dev *bridge, *dev, *tmp;
107 struct pci_bus *bus;
108
109 bridge = s->cb_dev;
110 if (!bridge)
111 return;
112
113 bus = bridge->subordinate;
114 if (!bus)
115 return;
116
117 pci_lock_rescan_remove();
118
119 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list)
120 pci_stop_and_remove_bus_device(dev);
121
122 pci_unlock_rescan_remove();
123}
124