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 unsigned long vga_base;
  13 EXPORT_SYMBOL(vga_base);
  14
  15 #ifdef __io
  16 void __iomem *ioport_map(unsigned long port, unsigned int nr)
  17 {
  18         return __io(port);
  19 }
  20 EXPORT_SYMBOL(ioport_map);
  21
  22 void ioport_unmap(void __iomem *addr)
  23 {
  24 }
  25 EXPORT_SYMBOL(ioport_unmap);
  26 #endif
  27
  28 #ifdef CONFIG_PCI
  29 unsigned long pcibios_min_io = 0x1000;
  30 EXPORT_SYMBOL(pcibios_min_io);
  31
  32 unsigned long pcibios_min_mem = 0x01000000;
  33 EXPORT_SYMBOL(pcibios_min_mem);
  34
  35 unsigned int pci_flags = PCI_REASSIGN_ALL_RSRC;
  36 EXPORT_SYMBOL(pci_flags);
  37
  38 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
  39 {
  40         resource_size_t start = pci_resource_start(dev, bar);
  41         resource_size_t len   = pci_resource_len(dev, bar);
  42         unsigned long flags = pci_resource_flags(dev, bar);
  43
  44         if (!len || !start)
  45                 return NULL;
  46         if (maxlen && len > maxlen)
  47                 len = maxlen;
  48         if (flags & IORESOURCE_IO)
  49                 return ioport_map(start, len);
  50         if (flags & IORESOURCE_MEM) {
  51                 if (flags & IORESOURCE_CACHEABLE)
  52                         return ioremap(start, len);
  53                 return ioremap_nocache(start, len);
  54         }
  55         return NULL;
  56 }
  57 EXPORT_SYMBOL(pci_iomap);
  58
  59 void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
  60 {
  61         if ((unsigned long)addr >= VMALLOC_START &&
  62             (unsigned long)addr < VMALLOC_END)
  63                 iounmap(addr);
  64 }
  65 EXPORT_SYMBOL(pci_iounmap);
  66 #endif