blob: 2ab899c4b4ce1ac38a7b235f5c340af49dcc923c [file] [log] [blame]
Ralf Baechle140c1722006-12-07 15:35:43 +01001/*
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{
Benjamin Herrenschmidtb70d3a22008-04-29 00:59:11 -070048 resource_size_t start = pci_resource_start(dev, bar);
49 resource_size_t len = pci_resource_len(dev, bar);
Ralf Baechle140c1722006-12-07 15:35:43 +010050 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);