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rapidio: add definitions of Component Tag fields

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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>
This commit is contained in:
Alexandre Bounine 2011-01-12 17:00:40 -08:00 committed by Linus Torvalds
parent ded0578271
commit e6536927e6
2 changed files with 11 additions and 1 deletions
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2
drivers/rapidio/rio.c
View File

@ -710,7 +710,7 @@ int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg)
u32 err_status, em_perrdet, em_ltlerrdet;
int rc, portnum;
rdev = rio_get_comptag(pw_msg->em.comptag, NULL);
rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
if (rdev == NULL) {
/* Device removed or enumeration error */
pr_debug("RIO: %s No matching device for CTag 0x%08x\n",

10
include/linux/rio.h
View File

@ -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 */