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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2013-08-27 21:15:02 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-09-02 13:49:29 +0100 |
| commit | 6a7d2c625656df5f8ad6e33aa3d164eefb1df8dc (patch) | |
| tree | d3d43dccef6c32bd8fbbb70963d222f22f623760 /arch/arm | |
| parent | 84b6504f560157ff2077dd3757eee481b81dc39b (diff) | |
| download | linux-6a7d2c625656df5f8ad6e33aa3d164eefb1df8dc.tar.gz | |
ARM: 7828/1: ARMv7-M: implement restart routine common to all v7-M machines
The newly introduced function is to be used as .restart callback for ARMv7-M machines. The used register is architecturally defined, so it should work for all M-class machines. Acked-by: Jonathan Austin <jonathan.austin@arm.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/v7m.h | 12 | ||||
| -rw-r--r-- | arch/arm/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/v7m.c | 19 |
3 files changed, 32 insertions, 1 deletions
diff --git a/arch/arm/include/asm/v7m.h b/arch/arm/include/asm/v7m.h index fa88d09fa3d9..615781c61627 100644 --- a/arch/arm/include/asm/v7m.h +++ b/arch/arm/include/asm/v7m.h @@ -15,6 +15,10 @@ #define V7M_SCB_VTOR 0x08 +#define V7M_SCB_AIRCR 0x0c +#define V7M_SCB_AIRCR_VECTKEY (0x05fa << 16) +#define V7M_SCB_AIRCR_SYSRESETREQ (1 << 2) + #define V7M_SCB_SCR 0x10 #define V7M_SCB_SCR_SLEEPDEEP (1 << 2) @@ -42,3 +46,11 @@ */ #define EXC_RET_STACK_MASK 0x00000004 #define EXC_RET_THREADMODE_PROCESSSTACK 0xfffffffd + +#ifndef __ASSEMBLY__ + +enum reboot_mode; + +void armv7m_restart(enum reboot_mode mode, const char *cmd); + +#endif /* __ASSEMBLY__ */ diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 86d10dd47dc4..5140df5f23aa 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -24,7 +24,7 @@ obj-$(CONFIG_ATAGS_PROC) += atags_proc.o obj-$(CONFIG_DEPRECATED_PARAM_STRUCT) += atags_compat.o ifeq ($(CONFIG_CPU_V7M),y) -obj-y += entry-v7m.o +obj-y += entry-v7m.o v7m.o else obj-y += entry-armv.o endif diff --git a/arch/arm/kernel/v7m.c b/arch/arm/kernel/v7m.c new file mode 100644 index 000000000000..4d2cba94f5cc --- /dev/null +++ b/arch/arm/kernel/v7m.c @@ -0,0 +1,19 @@ +/* + * Copyright (C) 2013 Uwe Kleine-Koenig for Pengutronix + * + * 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/io.h> +#include <linux/reboot.h> +#include <asm/barrier.h> +#include <asm/v7m.h> + +void armv7m_restart(enum reboot_mode mode, const char *cmd) +{ + dsb(); + __raw_writel(V7M_SCB_AIRCR_VECTKEY | V7M_SCB_AIRCR_SYSRESETREQ, + BASEADDR_V7M_SCB + V7M_SCB_AIRCR); + dsb(); +} |