1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Implement the default iomap interfaces
4  *
5  * (C) Copyright 2004 Linus Torvalds
6  * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org>
7  * (C) Copyright 2007 MIPS Technologies, Inc.
8  *     written by Ralf Baechle <ralf@linux-mips.org>
9  */
10 #include <linux/pci.h>
11 #include <linux/export.h>
12 #include <asm/io.h>
13 
14 #ifdef CONFIG_PCI_DRIVERS_LEGACY
15 
__pci_ioport_map(struct pci_dev * dev,unsigned long port,unsigned int nr)16 void __iomem *__pci_ioport_map(struct pci_dev *dev,
17 			       unsigned long port, unsigned int nr)
18 {
19 	struct pci_controller *ctrl = dev->bus->sysdata;
20 	unsigned long base = ctrl->io_map_base;
21 
22 	/* This will eventually become a BUG_ON but for now be gentle */
23 	if (unlikely(!ctrl->io_map_base)) {
24 		struct pci_bus *bus = dev->bus;
25 		char name[8];
26 
27 		while (bus->parent)
28 			bus = bus->parent;
29 
30 		ctrl->io_map_base = base = mips_io_port_base;
31 
32 		sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number);
33 		printk(KERN_WARNING "io_map_base of root PCI bus %s unset.  "
34 		       "Trying to continue but you better\nfix this issue or "
35 		       "report it to linux-mips@vger.kernel.org or your "
36 		       "vendor.\n", name);
37 #ifdef CONFIG_PCI_DOMAINS
38 		panic("To avoid data corruption io_map_base MUST be set with "
39 		      "multiple PCI domains.");
40 #endif
41 	}
42 
43 	return (void __iomem *) (ctrl->io_map_base + port);
44 }
45 
46 #endif /* CONFIG_PCI_DRIVERS_LEGACY */
47