[PATCH 01/19] pci: introduce an pci_ioremap(pdev, barnr) function

[Arjan van de Ven]

A common thing in many PCI drivers is to ioremap() an entire bar.
This is a slightly fragile thing right now, needing both an address and a size,
and many driver writers do.. various things there.

This patch introduces an pci_ioremap() function taking just a PCI device struct
and the bar number as arguments, and figures this all out itself, in one place.
In addition, we can add various sanity checks to this function (the patch already
checks to make sure that the bar in question really is a MEM bar; few to no drivers
do that sort of thing).

Hopefully with this type of API we get less chance of mistakes in drivers with
ioremap() operations.

Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
---
 include/linux/pci.h |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 709b8d4..3f8ce81 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1127,5 +1127,18 @@ static inline void pci_mmcfg_early_init(void) { }
 static inline void pci_mmcfg_late_init(void) { }
 #endif
 
+static inline void * pci_ioremap_bar(struct pci_dev *pdev, int bar)
+{
+	/*
+	 * Make sure the BAR is actually a memory resource, not an IO resource
+	 */
+	if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
+		WARN_ON(1);
+		return NULL;
+	}
+	return ioremap_nocache(pci_resource_start(pdev, bar),
+				     pci_resource_len(pdev, bar));
+}
+
 #endif /* __KERNEL__ */
 #endif /* LINUX_PCI_H */
-- 
1.5.5.1



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/