lkml.org 
[lkml]   [2014]   [Sep]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v11 15/19] serial: amba-pl011: Pass FIQ information to KGDB.
    Date
    Speculatively register a FIQ resource with KGDB. KGDB will only
    accept it if the kgdb/fiq feature is enabled (both with compile time and
    runtime switches) and the interrupt controller supports FIQ.

    By providing this information to KGDB the serial driver offers
    "permission" for KGDB to route the UART interrupt signal from the
    drivers own handler to KGDBs FIQ handler (which will eventually use the
    UART's polled I/O callbacks to interact with the user). This permission
    also implies the amba-pl011 driver has already unmasked RX interrupts
    (otherwise the FIQ handler will never trigger).

    Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
    Cc: Russell King <linux@arm.linux.org.uk>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Jiri Slaby <jslaby@suse.cz>
    Cc: linux-serial@vger.kernel.org
    ---
    drivers/tty/serial/amba-pl011.c | 15 ++++++++++++++-
    1 file changed, 14 insertions(+), 1 deletion(-)

    diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
    index 0b06dcf..63c67b0 100644
    --- a/drivers/tty/serial/amba-pl011.c
    +++ b/drivers/tty/serial/amba-pl011.c
    @@ -58,6 +58,7 @@
    #include <linux/pinctrl/consumer.h>
    #include <linux/sizes.h>
    #include <linux/io.h>
    +#include <linux/kgdb.h>

    #define UART_NR 14

    @@ -1466,6 +1467,18 @@ static int pl011_hwinit(struct uart_port *port)

    #ifdef CONFIG_CONSOLE_POLL

    +static int pl011_poll_init(struct uart_port *port)
    +{
    + int retval = pl011_hwinit(port);
    +
    +#ifdef CONFIG_KGDB_FIQ
    + if (retval == 0)
    + kgdb_register_fiq(port->irq);
    +#endif
    +
    + return retval;
    +}
    +
    static void pl011_quiesce_irqs(struct uart_port *port)
    {
    struct uart_amba_port *uap =
    @@ -1905,7 +1918,7 @@ static struct uart_ops amba_pl011_pops = {
    .config_port = pl011_config_port,
    .verify_port = pl011_verify_port,
    #ifdef CONFIG_CONSOLE_POLL
    - .poll_init = pl011_hwinit,
    + .poll_init = pl011_poll_init,
    .poll_get_char = pl011_get_poll_char,
    .poll_put_char = pl011_put_poll_char,
    #endif
    --
    1.9.3


    \
     
     \ /
      Last update: 2014-09-02 15:41    [W:4.285 / U:1.464 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site