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    Subject[PATCH 11/11] ARM: versatile: Make able to use UART ports for KGDB FIQ debugger
    Date
    If enabled, kernel will able to enter KGDB upon serial line activity on
    UART ports.

    Note that even with this patch and CONFIG_KGDB_FIQ is enabled, you still
    need to pass kgdb_fiq.enable=1 kernel command line option, otherwise UART
    will behave in a normal way.

    By default UART0 is used, but this can be changed via kgdb_fiq.uart_num
    kernel command line option.

    Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
    ---
    arch/arm/Kconfig | 1 +
    arch/arm/mach-versatile/Makefile | 1 +
    arch/arm/mach-versatile/kgdb_fiq.c | 31 +++++++++++++++++++++++++++++++
    3 files changed, 33 insertions(+)
    create mode 100644 arch/arm/mach-versatile/kgdb_fiq.c

    diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
    index fa10a2d..2bf83c6 100644
    --- a/arch/arm/Kconfig
    +++ b/arch/arm/Kconfig
    @@ -336,6 +336,7 @@ config ARCH_VERSATILE
    select PLAT_VERSATILE_CLCD
    select PLAT_VERSATILE_FPGA_IRQ
    select ARM_TIMER_SP804
    + select ARCH_MIGHT_HAVE_KGDB_FIQ
    help
    This enables support for ARM Ltd Versatile board.

    diff --git a/arch/arm/mach-versatile/Makefile b/arch/arm/mach-versatile/Makefile
    index 81fa3fe..bfd761f 100644
    --- a/arch/arm/mach-versatile/Makefile
    +++ b/arch/arm/mach-versatile/Makefile
    @@ -7,3 +7,4 @@ obj-$(CONFIG_ARCH_VERSATILE_PB) += versatile_pb.o
    obj-$(CONFIG_MACH_VERSATILE_AB) += versatile_ab.o
    obj-$(CONFIG_MACH_VERSATILE_DT) += versatile_dt.o
    obj-$(CONFIG_PCI) += pci.o
    +obj-$(CONFIG_KGDB_FIQ) += kgdb_fiq.o
    diff --git a/arch/arm/mach-versatile/kgdb_fiq.c b/arch/arm/mach-versatile/kgdb_fiq.c
    new file mode 100644
    index 0000000..3cdf71d
    --- /dev/null
    +++ b/arch/arm/mach-versatile/kgdb_fiq.c
    @@ -0,0 +1,31 @@
    +/*
    + * KGDB FIQ board support
    + *
    + * Copyright 2012 Linaro Ltd.
    + * Anton Vorontsov <anton.vorontsov@linaro.org>
    + *
    + * This program is free software; you can redistribute it and/or modify it
    + * under the terms of the GNU General Public License version 2 as published
    + * by the Free Software Foundation.
    + */
    +
    +#include <linux/module.h>
    +#include <linux/init.h>
    +#include <linux/kgdb.h>
    +#include <mach/hardware.h>
    +#include <mach/platform.h>
    +#include <asm/hardware/vic.h>
    +
    +static int kgdb_fiq;
    +module_param_named(uart_num, kgdb_fiq, int, 0600);
    +MODULE_PARM_DESC(uart_num, "UART<number> port to use for KGDB FIQ");
    +
    +static int __init kgdb_fiq_init(void)
    +{
    + WARN_ON(kgdb_fiq > INT_UARTINT2 - INT_UARTINT0);
    +
    + return kgdb_register_fiq(INT_UARTINT0 + kgdb_fiq,
    + vic_fiq_select,
    + vic_is_fiq_rised);
    +}
    +console_initcall(kgdb_fiq_init);
    --
    1.7.11.5


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