[PATCH][Doc] Document pci_iomap()

[Rolf Eike Beer <eike-kernel@sf-tec.de>]

This useful interface is hardly mentioned anywhere in the in-tree
documentation.

Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>

---
commit bdf4a23b9b1ff4be79a6f9b863f7203dba2dc808
tree a53c4a6c90e13d55fbf2a0b40cd9676bd9a5d0e5
parent 33738cbb6555861de1dce626c913fad06ce658cc
author Rolf Eike Beer <eike-kernel@sf-tec.de> Tue, 10 Jul 2007 11:08:51 +0200
committer Rolf Eike Beer <eike-kernel@sf-tec.de> Tue, 10 Jul 2007 11:08:51 +0200

 Documentation/DocBook/deviceiobook.tmpl |    3 ++-
 include/asm-i386/io.h                   |    3 +++
 lib/iomap.c                             |   15 ++++++++++++++-
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/Documentation/DocBook/deviceiobook.tmpl b/Documentation/DocBook/deviceiobook.tmpl
index 90ed23d..c917de6 100644
--- a/Documentation/DocBook/deviceiobook.tmpl
+++ b/Documentation/DocBook/deviceiobook.tmpl
@@ -316,7 +316,8 @@ CPU B:  spin_unlock_irqrestore(&amp;dev_lock, flags)
 
   <chapter id="pubfunctions">
      <title>Public Functions Provided</title>
-!Einclude/asm-i386/io.h
+!Iinclude/asm-i386/io.h
+!Elib/iomap.c
   </chapter>
 
 </book>
diff --git a/include/asm-i386/io.h b/include/asm-i386/io.h
index e797586..c48ef18 100644
--- a/include/asm-i386/io.h
+++ b/include/asm-i386/io.h
@@ -112,6 +112,9 @@ extern void __iomem * __ioremap(unsigned long offset, unsigned long size, unsign
  * writew/writel functions and the other mmio helpers. The returned
  * address is not guaranteed to be usable directly as a virtual
  * address. 
+ *
+ * If the area you are trying to map is a PCI BAR you should have a
+ * look at pci_iomap().
  */
 
 static inline void __iomem * ioremap(unsigned long offset, unsigned long size)
diff --git a/lib/iomap.c b/lib/iomap.c
index a57d262..864f2ec 100644
--- a/lib/iomap.c
+++ b/lib/iomap.c
@@ -240,7 +240,20 @@ void ioport_unmap(void __iomem *addr)
 EXPORT_SYMBOL(ioport_map);
 EXPORT_SYMBOL(ioport_unmap);
 
-/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
+/**
+ * pci_iomap - create a virtual mapping cookie for a PCI BAR
+ * @dev: PCI device that owns the BAR
+ * @bar: BAR number
+ * @maxlen: length of the memory to map
+ *
+ * Using this function you will get a __iomem address to your device BAR.
+ * You can access it using ioread*() and iowrite*(). These functions hide
+ * the details if this is a MMIO or PIO address space and will just do what
+ * you expect from them in the correct way.
+ *
+ * @maxlen specifies the maximum length to map. If you want to get access to
+ * the complete BAR without checking for its length first, pass %0 here.
+ * */
 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 {
 	unsigned long start = pci_resource_start(dev, bar);
-
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