diff options
author | Alexandre Bounine <alexandre.bounine@idt.com> | 2011-01-12 20:00:40 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 11:03:18 -0500 |
commit | e6536927e64a2511864f2141d3e5b198b3f25ba6 (patch) | |
tree | 5fafa02d6542e9ba215fd6606590b3fc34095359 /include | |
parent | ded05782719d0f7e79af98be7cf88c7e23a90435 (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')
-rw-r--r-- | include/linux/rio.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/rio.h b/include/linux/rio.h index 9b558856a8b6..ff681ebba585 100644 --- a/include/linux/rio.h +++ b/include/linux/rio.h | |||
@@ -66,6 +66,16 @@ | |||
66 | 66 | ||
67 | #define RIO_PW_MSG_SIZE 64 | 67 | #define RIO_PW_MSG_SIZE 64 |
68 | 68 | ||
69 | /* | ||
70 | * A component tag value (stored in the component tag CSR) is used as device's | ||
71 | * unique identifier assigned during enumeration. Besides being used for | ||
72 | * identifying switches (which do not have device ID register), it also is used | ||
73 | * by error management notification and therefore has to be assigned | ||
74 | * to endpoints as well. | ||
75 | */ | ||
76 | #define RIO_CTAG_RESRVD 0xfffe0000 /* Reserved */ | ||
77 | #define RIO_CTAG_UDEVID 0x0001ffff /* Unique device identifier */ | ||
78 | |||
69 | extern struct bus_type rio_bus_type; | 79 | extern struct bus_type rio_bus_type; |
70 | extern struct device rio_bus; | 80 | extern struct device rio_bus; |
71 | extern struct list_head rio_devices; /* list of all devices */ | 81 | extern struct list_head rio_devices; /* list of all devices */ |