Messages in this thread Patch in this message | | | From | Alexandre Bounine <> | Subject | [PATCH -mm 1/4] RapidIO: Add definitions of Component Tag fields | Date | Fri, 10 Dec 2010 15:38:15 -0500 |
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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> --- drivers/rapidio/rio.c | 2 +- include/linux/rio.h | 10 ++++++++++ 2 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c index c13289e..cc2a3b7 100644 --- a/drivers/rapidio/rio.c +++ b/drivers/rapidio/rio.c @@ -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", diff --git a/include/linux/rio.h b/include/linux/rio.h index 9b55885..ff681eb 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 */ -- 1.7.3.1
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