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 #include <asm/pci.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 unsigned int pci_flags = PCI_REASSIGN_ALL_RSRC;
  28 EXPORT_SYMBOL(pci_flags);
  29
  30 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
  31 {
  32         resource_size_t start = pci_resource_start(dev, bar);
  33         resource_size_t len   = pci_resource_len(dev, bar);
  34         unsigned long flags = pci_resource_flags(dev, bar);
  35
  36         if (!len || !start)
  37                 return NULL;
  38         if (maxlen && len > maxlen)
  39                 len = maxlen;
  40         if (flags & IORESOURCE_IO)
  41                 return ioport_map(start, len);
  42         if (flags & IORESOURCE_MEM) {
  43                 if (flags & IORESOURCE_CACHEABLE)
  44                         return ioremap(start, len);
  45                 return ioremap_nocache(start, len);
  46         }
  47         return NULL;
  48 }
  49 EXPORT_SYMBOL(pci_iomap);
  50
  51 void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
  52 {
  53         if ((unsigned long)addr >= VMALLOC_START &&
  54             (unsigned long)addr < VMALLOC_END)
  55                 iounmap(addr);
  56 }
  57 EXPORT_SYMBOL(pci_iounmap);
  58 #endif