Introduce get_reset_cause() function to indicate the source of the reset.
Signed-off-by: Fabio Estevam fabio.estevam@freescale.com --- arch/arm/cpu/arm1136/mx31/generic.c | 26 +++++++++++++++++++++++++ arch/arm/include/asm/arch-mx31/sys_proto.h | 29 ++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+), 0 deletions(-) create mode 100644 arch/arm/include/asm/arch-mx31/sys_proto.h
diff --git a/arch/arm/cpu/arm1136/mx31/generic.c b/arch/arm/cpu/arm1136/mx31/generic.c index 9b7a7a2..ea452a9 100644 --- a/arch/arm/cpu/arm1136/mx31/generic.c +++ b/arch/arm/cpu/arm1136/mx31/generic.c @@ -132,6 +132,32 @@ char *get_cpu_rev(void) return "unknown"; }
+char *get_reset_cause(void) +{ + /* read SRS register from CCM module */ + struct clock_control_regs *ccm = + (struct clock_control_regs *)CCM_BASE; + + u32 cause = readl(&ccm->rcsr) & 0x07; + + switch (cause) { + case 0x0000: + return "POR"; + break; + case 0x0001: + return "RST"; + break; + case 0x0002: + return "WDOG"; + break; + case 0x0006: + return "JTAG"; + break; + default: + return "unknown reset"; + } +} + #if defined(CONFIG_DISPLAY_CPUINFO) int print_cpuinfo (void) { diff --git a/arch/arm/include/asm/arch-mx31/sys_proto.h b/arch/arm/include/asm/arch-mx31/sys_proto.h new file mode 100644 index 0000000..7a0d03f --- /dev/null +++ b/arch/arm/include/asm/arch-mx31/sys_proto.h @@ -0,0 +1,29 @@ +/* + * (C) Copyright 2011 + * Stefano Babic, DENX Software Engineering, sbabic@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef _SYS_PROTO_H_ +#define _SYS_PROTO_H_ + +extern char *get_reset_cause(void); + +#endif