• Anton Vorontsov's avatar
    [WATCHDOG] mpc83xx_wdt: add support for MPC86xx CPUs · 500c919e
    Anton Vorontsov authored
    On MPC86xx the watchdog could be enabled only at power-on-reset, and could
    not be disabled afterwards.  We must ping the watchdog from the kernel
    until the userspace handles it.
    
    MPC83xx CPUs are only differ in a way that watchdog could be disabled
    once, but after it was enabled via software it becomes just the same as
    MPC86xx.
    
    Thus, to support MPC86xx I added the kernel timer which pings the watchdog
    until the userspace opens it.
    
    Since we implemented the timer, now we're able to implement proper
    handling for the CONFIG_WATCHDOG_NOWAYOUT case, for MPC83xx and MPC86xx.
    
    Also move the probe code into subsys_initcall, because we want start
    pinging the watchdog ASAP, and misc devices are available in
    subsys_initcall.
    Signed-off-by: default avatarAnton Vorontsov <avorontsov@ru.mvista.com>
    Cc: Kumar Gala <galak@kernel.crashing.org>
    Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    500c919e
mpc83xx_wdt.c 7.28 KB