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/mach-versatile/Makefile | 1 + arch/arm/mach-versatile/include/mach/irqs.h | 1 + arch/arm/mach-versatile/kgdb_fiq.c | 40 +++++++++++++++++++++++++++ 3 files changed, 42 insertions(+) create mode 100644 arch/arm/mach-versatile/kgdb_fiq.c
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/include/mach/irqs.h b/arch/arm/mach-versatile/include/mach/irqs.h index bf44c61..fcd2a95 100644 --- a/arch/arm/mach-versatile/include/mach/irqs.h +++ b/arch/arm/mach-versatile/include/mach/irqs.h @@ -26,6 +26,7 @@ * held within platform.h */ #define IRQ_VIC_START 0 +#define FIQ_START IRQ_VIC_START #define IRQ_WDOGINT (IRQ_VIC_START + INT_WDOGINT) #define IRQ_SOFTINT (IRQ_VIC_START + INT_SOFTINT) #define IRQ_COMMRx (IRQ_VIC_START + INT_COMMRx) diff --git a/arch/arm/mach-versatile/kgdb_fiq.c b/arch/arm/mach-versatile/kgdb_fiq.c new file mode 100644 index 0000000..c82e8ce --- /dev/null +++ b/arch/arm/mach-versatile/kgdb_fiq.c @@ -0,0 +1,40 @@ +/* + * KGDB FIQ entry board/IC 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/types.h> +#include <linux/kgdb.h> +#include <mach/hardware.h> +#include <mach/platform.h> +#include <asm/kgdb.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 bool is_kgdb_nmi(void) +{ + return vic_is_fiq_rised(kgdb_fiq); +} + +void kgdb_arch_enable_nmi(bool on) +{ + vic_fiq_select(kgdb_fiq, on); +} + +static int kgdb_fiq_init(void) +{ + kgdb_fiq += INT_UARTINT0; + kgdb_register_nmi(is_kgdb_nmi); + return 0; +} +console_initcall(kgdb_fiq_init);