linux-kernel - [PATCH] pci: introduce an ioremap

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Date:	Fri, 26 Sep 2008 16:36:41 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-pci@...r.kernel.org
Subject: [PATCH] pci: introduce an ioremap_pcibar(pdev, barnr) function

>From abb4ec6b5b7f22904668fb5de5fe0d7a3a7fd2d5 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@...ux.intel.com>
Date: Fri, 26 Sep 2008 16:34:52 -0700
Subject: [PATCH] pci: introduce an ioremap_pcibar(pdev, barnr) function

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 ioremap_pcibar() 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@...ux.intel.com>
---
 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 e48614b..65c1dbc 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1122,5 +1122,18 @@ static inline void pci_mmcfg_early_init(void) { }
 static inline void pci_mmcfg_late_init(void) { }
 #endif
 
+static inline void * ioremap_pcibar(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
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