release/src-rt-6.x.4708/linux/linux-2.6.36/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
  13 void __iomem *ioport_map(unsigned long port, unsigned int nr)
  14 {
  15         return __io(port);
  16 }
  17 EXPORT_SYMBOL(ioport_map);
  18
  19 void ioport_unmap(void __iomem *addr)
  20 {
  21 }
  22 EXPORT_SYMBOL(ioport_unmap);
  23 #endif
  24
  25 #ifdef CONFIG_PCI
  26 void __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 }
  45 EXPORT_SYMBOL(pci_iomap);
  46
  47 void 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 }
  53 EXPORT_SYMBOL(pci_iounmap);
  54 #endif