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

 1/*
 2 * Implement the default iomap interfaces
 3 *
 4 * (C) Copyright 2004 Linus Torvalds
 5 * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org>
 6 * (C) Copyright 2007 MIPS Technologies, Inc.
 7 *     written by Ralf Baechle <ralf@linux-mips.org>
 8 */
 9#include <linux/pci.h>
10#include <linux/module.h>
11#include <asm/io.h>
12
13static void __iomem *ioport_map_pci(struct pci_dev *dev,
14                                     unsigned long port, unsigned int nr)
15{
16	struct pci_controller *ctrl = dev->bus->sysdata;
17	unsigned long base = ctrl->io_map_base;
18
19	/* This will eventually become a BUG_ON but for now be gentle */
20	if (unlikely(!ctrl->io_map_base)) {
21		struct pci_bus *bus = dev->bus;
22		char name[8];
23
24		while (bus->parent)
25			bus = bus->parent;
26
27		ctrl->io_map_base = base = mips_io_port_base;
28
29		sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number);
30		printk(KERN_WARNING "io_map_base of root PCI bus %s unset.  "
31		       "Trying to continue but you better\nfix this issue or "
32		       "report it to linux-mips@linux-mips.org or your "
33		       "vendor.\n", name);
34#ifdef CONFIG_PCI_DOMAINS
35		panic("To avoid data corruption io_map_base MUST be set with "
36		      "multiple PCI domains.");
37#endif
38	}
39
40	return (void __iomem *) (ctrl->io_map_base + port);
41}
42
43/*
44 * Create a virtual mapping cookie for a PCI BAR (memory or IO)
45 */
46void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
47{
48	resource_size_t start = pci_resource_start(dev, bar);
49	resource_size_t len = pci_resource_len(dev, bar);
50	unsigned long flags = pci_resource_flags(dev, bar);
51
52	if (!len || !start)
53		return NULL;
54	if (maxlen && len > maxlen)
55		len = maxlen;
56	if (flags & IORESOURCE_IO)
57		return ioport_map_pci(dev, start, len);
58	if (flags & IORESOURCE_MEM) {
59		if (flags & IORESOURCE_CACHEABLE)
60			return ioremap(start, len);
61		return ioremap_nocache(start, len);
62	}
63	/* What? */
64	return NULL;
65}
66
67EXPORT_SYMBOL(pci_iomap);
68
69void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
70{
71	iounmap(addr);
72}
73
74EXPORT_SYMBOL(pci_iounmap);