release/src-rt-6.x.4708/linux/linux-2.6.36/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
  13 static 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  */
  46 void __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
  67 EXPORT_SYMBOL(pci_iomap);
  68
  69 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
  70 {
  71         iounmap(addr);
  72 }
  73
  74 EXPORT_SYMBOL(pci_iounmap);