linux-kernel - [PATCH v3] new helper to define common struct resource constructs

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Date:	Thu, 14 Jul 2011 10:11:05 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Arnd Bergmann <arnd@...db.de>,
	H Hartley Sweeten <hartleys@...ionengravers.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Wolfram Sang <w.sang@...gutronix.de>,
	linux-kernel@...r.kernel.org, thierry.nolf.barco@...il.com,
	Huang Shijie <b32955@...escale.com>,
	linux-mtd@...ts.infradead.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lothar Waßmann <LW@...o-electronics.de>
Subject: [PATCH v3] new helper to define common struct resource constructs

resource definitions that just define start, end and flags =
IORESOURCE_MEM or IORESOURCE_IRQ (with start=end) are quite common. So
introduce a shortcut for them. For completeness add macros for
IORESOURCE_DMA and IORESOURCE_IO, too and also make available a set of
macros to specify named resources of all types which are less common.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
changes since v2:
- add parentheses around macro parameter usages

changes since v1:                                                               
- also add _IO and _DMA variants                                                

 include/linux/ioport.h |   30 ++++++++++++++++++++++++++++++
 1 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 63eb429..9d57a71 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -109,6 +109,36 @@ struct resource_list {
 /* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
 #define IORESOURCE_PCI_FIXED		(1<<4)	/* Do not move resource */
 
+
+/* helpers to define resources */
+#define DEFINE_RES_NAMED(_start, _size, _name, _flags)			\
+	{								\
+		.start = (_start),					\
+		.end = (_start) + (_size) - 1,				\
+		.name = (_name),					\
+		.flags = (_flags),					\
+	}
+
+#define DEFINE_RES_IO_NAMED(_start, _size, _name)			\
+	DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO)
+#define DEFINE_RES_IO(_start, _size)					\
+	DEFINE_RES_IO_NAMED((_start), (_size), NULL)
+
+#define DEFINE_RES_MEM_NAMED(_start, _size, _name)			\
+	DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_MEM)
+#define DEFINE_RES_MEM(_start, _size)					\
+	DEFINE_RES_MEM_NAMED((_start), (_size), NULL)
+
+#define DEFINE_RES_IRQ_NAMED(_irq, _name)				\
+	DEFINE_RES_NAMED((_irq), 1, (_name), IORESOURCE_IRQ)
+#define DEFINE_RES_IRQ(_irq)						\
+	DEFINE_RES_IRQ_NAMED((_irq), NULL)
+
+#define DEFINE_RES_DMA_NAMED(_dma, _name)				\
+	DEFINE_RES_NAMED((_dma), 1, (_name), IORESOURCE_DMA)
+#define DEFINE_RES_DMA(_dma)						\
+	DEFINE_RES_DMA_NAMED((_dma), NULL)
+
 /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
 extern struct resource ioport_resource;
 extern struct resource iomem_resource;
-- 
1.7.5.4

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