include/linux/ioport.h: new helper to define common struct resource constructs
Uwe Kleine-König [Tue, 26 Jul 2011 00:13:00 +0000 (17:13 -0700)]
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@pengutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/ioport.h

index e9bb22c..c2ebfe6 100644 (file)
@@ -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;