iomap.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * ppc64 "iomap" interface implementation.
 4 *
 5 * (C) Copyright 2004 Linus Torvalds
 6 */
 7#include <linux/init.h>
 8#include <linux/pci.h>
 9#include <linux/mm.h>
10#include <linux/export.h>
11#include <linux/io.h>
12#include <asm/pci-bridge.h>
13
14static DEFINE_SPINLOCK(hose_spinlock);
15LIST_HEAD(hose_list);
16
17unsigned long isa_io_base;
18EXPORT_SYMBOL(isa_io_base);
19
20static resource_size_t pcibios_io_size(const struct pci_controller *hose)
21{
22	return resource_size(&hose->io_resource);
23}
24
25int pcibios_vaddr_is_ioport(void __iomem *address)
26{
27	int ret = 0;
28	struct pci_controller *hose;
29	resource_size_t size;
30
31	spin_lock(&hose_spinlock);
32	list_for_each_entry(hose, &hose_list, list_node) {
33		size = pcibios_io_size(hose);
34		if (address >= hose->io_base_virt &&
35		    address < (hose->io_base_virt + size)) {
36			ret = 1;
37			break;
38		}
39	}
40	spin_unlock(&hose_spinlock);
41	return ret;
42}
43
44/* Display the domain number in /proc */
45int pci_proc_domain(struct pci_bus *bus)
46{
47	return pci_domain_nr(bus);
48}
49
50void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
51{
52	if (isa_vaddr_is_ioport(addr))
53		return;
54	if (pcibios_vaddr_is_ioport(addr))
55		return;
56	iounmap(addr);
57}
58EXPORT_SYMBOL(pci_iounmap);