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
  11 #include <asm/io.h>
  12
  13 #ifdef __io
  14 void __iomem *ioport_map(unsigned long port, unsigned int nr)
  15 {
  16         return __io(port);
  17 }
  18 EXPORT_SYMBOL(ioport_map);
  19
  20 void ioport_unmap(void __iomem *addr)
  21 {
  22 }
  23 EXPORT_SYMBOL(ioport_unmap);
  24 #endif
  25
  26 #ifdef CONFIG_PCI
  27 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
  28 {
  29         unsigned long start = pci_resource_start(dev, bar);
  30         unsigned long len   = pci_resource_len(dev, bar);
  31         unsigned long flags = pci_resource_flags(dev, bar);
  32
  33         if (!len || !start)
  34                 return NULL;
  35         if (maxlen && len > maxlen)
  36                 len = maxlen;
  37         if (flags & IORESOURCE_IO)
  38                 return ioport_map(start, len);
  39         if (flags & IORESOURCE_MEM) {
  40                 if (flags & IORESOURCE_CACHEABLE)
  41                         return ioremap(start, len);
  42                 return ioremap_nocache(start, len);
  43         }
  44         return NULL;
  45 }
  46 EXPORT_SYMBOL(pci_iomap);
  47
  48 void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
  49 {
  50         if ((unsigned long)addr >= VMALLOC_START &&
  51             (unsigned long)addr < VMALLOC_END)
  52                 iounmap(addr);
  53 }
  54 EXPORT_SYMBOL(pci_iounmap);
  55 #endif