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 unsigned long pcibios_min_io = 0x1000;
  27 EXPORT_SYMBOL(pcibios_min_io);
  28
  29 unsigned long pcibios_min_mem = 0x01000000;
  30 EXPORT_SYMBOL(pcibios_min_mem);
  31
  32 unsigned int pci_flags = PCI_REASSIGN_ALL_RSRC;
  33 EXPORT_SYMBOL(pci_flags);
  34
  35 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
  36 {
  37         resource_size_t start = pci_resource_start(dev, bar);
  38         resource_size_t len   = pci_resource_len(dev, bar);
  39         unsigned long flags = pci_resource_flags(dev, bar);
  40
  41         if (!len || !start)
  42                 return NULL;
  43         if (maxlen && len > maxlen)
  44                 len = maxlen;
  45         if (flags & IORESOURCE_IO)
  46                 return ioport_map(start, len);
  47         if (flags & IORESOURCE_MEM) {
  48                 if (flags & IORESOURCE_CACHEABLE)
  49                         return ioremap(start, len);
  50                 return ioremap_nocache(start, len);
  51         }
  52         return NULL;
  53 }
  54 EXPORT_SYMBOL(pci_iomap);
  55
  56 void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
  57 {
  58         if ((unsigned long)addr >= VMALLOC_START &&
  59             (unsigned long)addr < VMALLOC_END)
  60                 iounmap(addr);
  61 }
  62 EXPORT_SYMBOL(pci_iounmap);
  63 #endif