diff options
| -rw-r--r-- | common/Kconfig | 8 | ||||
| -rw-r--r-- | common/Makefile | 1 | ||||
| -rw-r--r-- | common/reset_source.c | 44 | ||||
| -rw-r--r-- | include/reset_source.h | 27 |
4 files changed, 80 insertions, 0 deletions
diff --git a/common/Kconfig b/common/Kconfig index b776031bad..59bd301858 100644 --- a/common/Kconfig +++ b/common/Kconfig @@ -548,6 +548,14 @@ config BAREBOXENV_TARGET config POLLER bool "generic polling infrastructure" +config RESET_SOURCE + bool "detect Reset cause" + depends on GLOBALVAR + help + Provide a global variable at runtine which reflects the possible cause + of the reset and why the bootloader is currently running. It can be + useful for any kind of system recovery or repair. + endmenu menu "Debugging " diff --git a/common/Makefile b/common/Makefile index a1926d346d..9b150a8e93 100644 --- a/common/Makefile +++ b/common/Makefile @@ -30,6 +30,7 @@ obj-y += startup.o obj-y += misc.o obj-y += memsize.o obj-$(CONFIG_GLOBALVAR) += globalvar.o +obj-$(CONFIG_RESET_SOURCE) += reset_source.o obj-$(CONFIG_FILETYPE) += filetype.o obj-y += resource.o obj-$(CONFIG_MENU) += menu.o diff --git a/common/reset_source.c b/common/reset_source.c new file mode 100644 index 0000000000..2a7f9ff6cc --- /dev/null +++ b/common/reset_source.c @@ -0,0 +1,44 @@ +/* + * (C) Copyright 2012 Juergen Beisert - <kernel@pengutronix.de> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <common.h> +#include <init.h> +#include <environment.h> +#include <globalvar.h> +#include <reset_source.h> + +static const char * const reset_src_names[] = { + [RESET_UKWN] = "unknown", + [RESET_POR] = "POR", + [RESET_RST] = "RST", + [RESET_WDG] = "WDG", + [RESET_WKE] = "WKE", + [RESET_JTAG] = "JTAG", +}; + +void set_reset_source(enum reset_src_type st) +{ + setenv("global.system.reset", reset_src_names[st]); +} +EXPORT_SYMBOL(set_reset_source); + +/* ensure this runs after the 'global' device is already registerd */ +static int init_reset_source(void) +{ + globalvar_add_simple("system.reset"); + set_reset_source(RESET_UKWN); + return 0; +} + +coredevice_initcall(init_reset_source); diff --git a/include/reset_source.h b/include/reset_source.h new file mode 100644 index 0000000000..6734fbdee6 --- /dev/null +++ b/include/reset_source.h @@ -0,0 +1,27 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __INCLUDE_RESET_SOURCE_H +# define __INCLUDE_RESET_SOURCE_H + +enum reset_src_type { + RESET_UKWN, /* maybe the SoC cannot detect the reset source */ + RESET_POR, /* Power On Reset (cold start) */ + RESET_RST, /* generic ReSeT (warm start) */ + RESET_WDG, /* watchdog */ + RESET_WKE, /* wake-up (some SoCs can handle this) */ + RESET_JTAG, /* JTAG reset */ +}; + +void set_reset_source(enum reset_src_type); + +#endif /* __INCLUDE_RESET_SOURCE_H */ |