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iomap.c

/*
 *  linux/arch/arm/mm/iomap.c
 *
 * Map IO port and PCI memory spaces so that {read,write}[bwl] can
 * be used to access this memory.
 */
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ioport.h>

#include <asm/io.h>

#ifdef __io
void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
      return __io(port);
}
EXPORT_SYMBOL(ioport_map);

void ioport_unmap(void __iomem *addr)
{
}
EXPORT_SYMBOL(ioport_unmap);
#endif

#ifdef CONFIG_PCI
void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
{
      resource_size_t start = pci_resource_start(dev, bar);
      resource_size_t len   = pci_resource_len(dev, bar);
      unsigned long flags = pci_resource_flags(dev, bar);

      if (!len || !start)
            return NULL;
      if (maxlen && len > maxlen)
            len = maxlen;
      if (flags & IORESOURCE_IO)
            return ioport_map(start, len);
      if (flags & IORESOURCE_MEM) {
            if (flags & IORESOURCE_CACHEABLE)
                  return ioremap(start, len);
            return ioremap_nocache(start, len);
      }
      return NULL;
}
EXPORT_SYMBOL(pci_iomap);

void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
{
      if ((unsigned long)addr >= VMALLOC_START &&
          (unsigned long)addr < VMALLOC_END)
            iounmap(addr);
}
EXPORT_SYMBOL(pci_iounmap);
#endif

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