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, &irq_pin);
42		if (irq_pin) {
43			dev->irq = irq;
44			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 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(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	pci_fixup_cardbus(bus);
76
77	max = bus->busn_res.start;
78	for (pass = 0; pass < 2; pass++)
79		for_each_pci_bridge(dev, bus)
80			max = pci_scan_bridge(bus, dev, max, pass);
81
82	/*
83	 * Size all resources below the CardBus controller.
84	 */
85	pci_bus_size_bridges(bus);
86	pci_bus_assign_resources(bus);
87	cardbus_config_irq_and_cls(bus, s->pci_irq);
88
89	/* socket specific tune function */
90	if (s->tune_bridge)
91		s->tune_bridge(s, bus);
92
93	pci_bus_add_devices(bus);
94
95	pci_unlock_rescan_remove();
96	return 0;
97}
98
99/**
100 * cb_free() - remove CardBus device
101 * @s:		the pcmcia_socket where the CardBus device was located
102 *
103 * cb_free() handles the lowest level PCI device cleanup.
104 */
105void cb_free(struct pcmcia_socket *s)
106{
107	struct pci_dev *bridge, *dev, *tmp;
108	struct pci_bus *bus;
109
110	bridge = s->cb_dev;
111	if (!bridge)
112		return;
113
114	bus = bridge->subordinate;
115	if (!bus)
116		return;
117
118	pci_lock_rescan_remove();
119
120	list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list)
121		pci_stop_and_remove_bus_device(dev);
122
123	pci_unlock_rescan_remove();
124}
125