LXR linux/arch/arm/mm/iomap.c

   1/*
   2 *  linux/arch/arm/mm/iomap.c
   3 *
   4 * Map IO port and PCI memory spaces so that {read,write}[bwl] can
   5 * be used to access this memory.
   6 */
   7#include <linux/module.h>
   8#include <linux/pci.h>
   9#include <linux/ioport.h>
  10#include <linux/io.h>
  11
  12#ifdef __io
  13void __iomem *ioport_map(unsigned long port, unsigned int nr)
  14{
  15        return __io(port);
  16}
  17EXPORT_SYMBOL(ioport_map);
  18
  19void ioport_unmap(void __iomem *addr)
  20{
  21}
  22EXPORT_SYMBOL(ioport_unmap);
  23#endif
  24
  25#ifdef CONFIG_PCI
  26void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
  27{
  28        resource_size_t start = pci_resource_start(dev, bar);
  29        resource_size_t len   = pci_resource_len(dev, bar);
  30        unsigned long flags = pci_resource_flags(dev, bar);
  31
  32        if (!len || !start)
  33                return NULL;
  34        if (maxlen && len > maxlen)
  35                len = maxlen;
  36        if (flags & IORESOURCE_IO)
  37                return ioport_map(start, len);
  38        if (flags & IORESOURCE_MEM) {
  39                if (flags & IORESOURCE_CACHEABLE)
  40                        return ioremap(start, len);
  41                return ioremap_nocache(start, len);
  42        }
  43        return NULL;
  44}
  45EXPORT_SYMBOL(pci_iomap);
  46
  47void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
  48{
  49        if ((unsigned long)addr >= VMALLOC_START &&
  50            (unsigned long)addr < VMALLOC_END)
  51                iounmap(addr);
  52}
  53EXPORT_SYMBOL(pci_iounmap);
  54#endif
  55