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authorAlexandre Bounine <alexandre.bounine@idt.com>2011-01-12 17:00:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 08:03:18 -0800
commite6536927e64a2511864f2141d3e5b198b3f25ba6 (patch)
tree5fafa02d6542e9ba215fd6606590b3fc34095359 /include/linux/rio.h
parentded05782719d0f7e79af98be7cf88c7e23a90435 (diff)
rapidio: add definitions of Component Tag fields
Add definition of the unique device identifier field in the component tag. RIO_CTAG_UDEVID does not take all 32 bits of the component tag value to allow future extensions to the component tag use. Selected size of the RIO_CTAG_UDEVID field (17 bits) is sufficient to accommodate maximum number of endpoints in large RIO network (16-bit id) plus switches. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Cc: Thomas Moll <thomas.moll@sysgo.com> Cc: Micha Nelissen <micha@neli.hopto.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/rio.h')
-rw-r--r--include/linux/rio.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/rio.h b/include/linux/rio.h
index 9b558856a8b..ff681ebba58 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -66,6 +66,16 @@
#define RIO_PW_MSG_SIZE 64
+/*
+ * A component tag value (stored in the component tag CSR) is used as device's
+ * unique identifier assigned during enumeration. Besides being used for
+ * identifying switches (which do not have device ID register), it also is used
+ * by error management notification and therefore has to be assigned
+ * to endpoints as well.
+ */
+#define RIO_CTAG_RESRVD 0xfffe0000 /* Reserved */
+#define RIO_CTAG_UDEVID 0x0001ffff /* Unique device identifier */
+
extern struct bus_type rio_bus_type;
extern struct device rio_bus;
extern struct list_head rio_devices; /* list of all devices */