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| author | Alexandre Bounine <alexandre.bounine@idt.com> | 2011-01-12 17:00:40 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 08:03:18 -0800 |
| commit | e6536927e64a2511864f2141d3e5b198b3f25ba6 (patch) | |
| tree | 5fafa02d6542e9ba215fd6606590b3fc34095359 /include/linux/rio.h | |
| parent | ded05782719d0f7e79af98be7cf88c7e23a90435 (diff) | |
| download | lwn-e6536927e64a2511864f2141d3e5b198b3f25ba6.tar.gz lwn-e6536927e64a2511864f2141d3e5b198b3f25ba6.zip | |
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.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 @@ #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 */ |