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ARM: 7828/1: ARMv7-M: implement restart routine common to all v7-M machines

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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>
This commit is contained in:
Uwe Kleine-König 2013-08-27 21:15:02 +01:00 committed by Russell King
parent 84b6504f56
commit 6a7d2c6256
3 changed files with 32 additions and 1 deletions
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12
arch/arm/include/asm/v7m.h
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@ -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__ */

2
arch/arm/kernel/Makefile
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@ -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

19
arch/arm/kernel/v7m.c Normal file
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@ -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();
}