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 
14 static DEFINE_SPINLOCK(hose_spinlock);
15 LIST_HEAD(hose_list);
16 
17 unsigned long isa_io_base;
18 EXPORT_SYMBOL(isa_io_base);
19 
pcibios_io_size(const struct pci_controller * hose)20 static resource_size_t pcibios_io_size(const struct pci_controller *hose)
21 {
22 	return resource_size(&hose->io_resource);
23 }
24 
pcibios_vaddr_is_ioport(void __iomem * address)25 int 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 */
pci_proc_domain(struct pci_bus * bus)45 int pci_proc_domain(struct pci_bus *bus)
46 {
47 	return pci_domain_nr(bus);
48 }
49 
pci_iounmap(struct pci_dev * dev,void __iomem * addr)50 void 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 }
58 EXPORT_SYMBOL(pci_iounmap);
59