arch/mips/lib/iomap.c

   1 /*
   2  *  iomap.c, Memory Mapped I/O routines for MIPS architecture.
   3  *
   4  *  This code is based on lib/iomap.c, by Linus Torvalds.
   5  *
   6  *  Copyright (C) 2004-2005  Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22 #include <linux/ioport.h>
  23 #include <linux/module.h>
  24 #include <linux/pci.h>
  25
  26 #include <asm/io.h>
  27
  28 void __iomem *ioport_map(unsigned long port, unsigned int nr)
  29 {
  30         unsigned long end;
  31
  32         end = port + nr - 1UL;
  33         if (ioport_resource.start > port ||
  34             ioport_resource.end < end || port > end)
  35                 return NULL;
  36
  37         return (void __iomem *)(mips_io_port_base + port);
  38 }
  39
  40 void ioport_unmap(void __iomem *addr)
  41 {
  42 }
  43 EXPORT_SYMBOL(ioport_map);
  44 EXPORT_SYMBOL(ioport_unmap);
  45
  46 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
  47 {
  48         unsigned long start, len, flags;
  49
  50         if (dev == NULL)
  51                 return NULL;
  52
  53         start = pci_resource_start(dev, bar);
  54         len = pci_resource_len(dev, bar);
  55         if (!start || !len)
  56                 return NULL;
  57
  58         if (maxlen != 0 && len > maxlen)
  59                 len = maxlen;
  60
  61         flags = pci_resource_flags(dev, bar);
  62         if (flags & IORESOURCE_IO)
  63                 return ioport_map(start, len);
  64         if (flags & IORESOURCE_MEM) {
  65                 if (flags & IORESOURCE_CACHEABLE)
  66                         return ioremap_cacheable_cow(start, len);
  67                 return ioremap_nocache(start, len);
  68         }
  69
  70         return NULL;
  71 }
  72
  73 void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
  74 {
  75         iounmap(addr);
  76 }
  77 EXPORT_SYMBOL(pci_iomap);
  78 EXPORT_SYMBOL(pci_iounmap);