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/arch/mips/lib/iomap-pci.c

http://github.com/mirrors/linux
C | 46 lines | 28 code | 8 blank | 10 comment | 2 complexity | 139d0368320fc1043cc111dfb8f7e433 MD5 | raw file
 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
16void __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@linux-mips.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 */