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    Subject[PATCH -mm 1/4] RapidIO: Add definitions of Component Tag fields
    Date
    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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