From 5ca24814247fa4c039b893bf80fc05d0e5d41b00 Mon Sep 17 00:00:00 2001 From: Rolf Eike Beer Date: Thu, 19 Jul 2007 17:48:44 -0700 Subject: PCI: Document pci_iomap() This useful interface is hardly mentioned anywhere in the in-tree documentation. Signed-off-by: Rolf Eike Beer Cc: Tejun Heo Acked-by: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- lib/iomap.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'lib') 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); -- cgit v1.1